CN118320615A - Sintering flue gas SCR denitration device based on dry desulfurization and control method thereof - Google Patents
Sintering flue gas SCR denitration device based on dry desulfurization and control method thereof Download PDFInfo
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- CN118320615A CN118320615A CN202410629206.4A CN202410629206A CN118320615A CN 118320615 A CN118320615 A CN 118320615A CN 202410629206 A CN202410629206 A CN 202410629206A CN 118320615 A CN118320615 A CN 118320615A
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- 239000003546 flue gas Substances 0.000 title claims abstract description 245
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 244
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 35
- 230000023556 desulfurization Effects 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000005245 sintering Methods 0.000 title claims abstract description 23
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 450
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 195
- 238000005192 partition Methods 0.000 claims abstract description 68
- 239000000779 smoke Substances 0.000 claims abstract description 29
- 239000007921 spray Substances 0.000 claims description 24
- 239000000428 dust Substances 0.000 claims description 22
- 238000000926 separation method Methods 0.000 claims description 17
- 238000010521 absorption reaction Methods 0.000 claims description 16
- 238000005507 spraying Methods 0.000 claims description 12
- 238000009423 ventilation Methods 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 11
- 230000000903 blocking effect Effects 0.000 claims description 10
- 239000007789 gas Substances 0.000 claims description 10
- 230000004888 barrier function Effects 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 239000012717 electrostatic precipitator Substances 0.000 claims 3
- 230000002349 favourable effect Effects 0.000 abstract description 19
- 230000001360 synchronised effect Effects 0.000 abstract description 6
- 239000003517 fume Substances 0.000 abstract 2
- 230000009471 action Effects 0.000 description 26
- 230000000694 effects Effects 0.000 description 14
- 238000002156 mixing Methods 0.000 description 12
- 230000009286 beneficial effect Effects 0.000 description 10
- 230000001276 controlling effect Effects 0.000 description 9
- 238000006243 chemical reaction Methods 0.000 description 8
- 239000002699 waste material Substances 0.000 description 7
- 239000003054 catalyst Substances 0.000 description 6
- 238000001125 extrusion Methods 0.000 description 5
- 230000001105 regulatory effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000005096 rolling process Methods 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 230000002411 adverse Effects 0.000 description 3
- 238000010531 catalytic reduction reaction Methods 0.000 description 3
- 239000012716 precipitator Substances 0.000 description 3
- 150000003863 ammonium salts Chemical class 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000036541 health Effects 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000009931 harmful effect Effects 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8696—Controlling the catalytic process
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/005—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by heat treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1456—Removing acid components
- B01D53/1481—Removing sulfur dioxide or sulfur trioxide
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/18—Absorbing units; Liquid distributors therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/30—Controlling by gas-analysis apparatus
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/90—Injecting reactants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
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Abstract
The invention relates to the technical field of SCR denitration, in particular to sintering flue gas SCR denitration equipment based on dry desulfurization and a control method thereof, and the sintering flue gas SCR denitration equipment further comprises the following steps: the ammonia gas input assembly is used for inputting ammonia gas into the SCR reactor to perform denitration; the SCR reactor comprises an input pipe at one end, the input pipe is divided into an upper flue gas input cavity and a lower ammonia gas input cavity by a partition plate, the ammonia gas input cavity is communicated with the ammonia gas input assembly, and the flue gas input cavity is communicated with a boiler; the equal-ratio air inlet assembly is arranged in the input pipe and is used for releasing the smoke input by the smoke input cavity and the ammonia input by the ammonia input cavity in equal proportion; the device is through the setting of the equal ratio subassembly that admits air for when the fume emission reduces, the equal ratio subassembly that admits air can the synchronous control ammonia input reduces, thereby is favorable to avoiding when the fume emission is unstable, leads to the condition emergence of ammonia escape.
Description
Technical Field
The invention relates to the field of SCR denitration, in particular to sintering flue gas SCR denitration equipment based on dry desulfurization and a control method thereof.
Background
Sintering flue gas Selective Catalytic Reduction (SCR) denitration based on dry desulfurization is a flue gas purification scheme combining a dry desulfurization technology and an SCR denitration technology, and is mainly applied to flue gas treatment generated in a sintering process in the steel industry. By precisely controlling the amount of ammonia injected to minimize escape of unreacted ammonia, excessive ammonia can lead to secondary pollution and possible corrosion problems.
The ammonia escape control is a technical measure for effectively managing and reducing ammonia (NH 3) which is directly discharged into the atmosphere without participating in the reaction in the process of adopting denitration technologies such as Selective Catalytic Reduction (SCR) and the like to treat the flue gas. The escape of ammonia not only causes resource waste, but also can form secondary pollution, such as environmental problems caused by the generation of ammonium salt or adverse effects on human health. Therefore, the mixing process of the flue gas and the ammonia gas needs to be optimized, the mixing uniformity of NH 3 and the flue gas is improved, and the reaction is ensured to be sufficient.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides sintering flue gas SCR denitration equipment based on dry desulfurization and a control method thereof.
In a first aspect, the invention provides sintering flue gas SCR denitration equipment based on dry desulfurization, which comprises a heat exchanger, an electric precipitator, an SO 2 absorption tower and an SCR reactor, wherein flue gas discharged by a boiler passes through the electric precipitator to remove dust and then reaches the SO 2 absorption tower to carry out desulfurization, the flue gas after desulfurization passes through the electric precipitator to remove dust and then reaches the SCR reactor to carry out denitration treatment, and the heat exchanger exchanges heat with the passing flue gas and further comprises:
The ammonia gas input assembly is used for inputting ammonia gas into the SCR reactor to perform denitration;
The SCR reactor comprises an input pipe at one end, the input pipe is divided into an upper flue gas input cavity and a lower ammonia gas input cavity by a partition plate, the ammonia gas input cavity is communicated with the ammonia gas input assembly, and the flue gas input cavity is communicated with a boiler;
The equal-ratio air inlet assembly is arranged in the input pipe and is used for releasing the smoke input by the smoke input cavity and the ammonia input by the ammonia input cavity in equal proportion, so that the smoke and the ammonia enter the SCR reactor according to a fixed ratio;
Flue gas discharged from the boiler firstly passes through the electric dust collector to remove dust and then reaches the SO 2 absorption tower to carry out desulfurization, the flue gas after desulfurization passes through the electric dust collector to remove dust and then reaches the SCR reactor to carry out denitration treatment, the heat exchanger exchanges heat on the passing flue gas, and the flue gas entering the SO 2 absorption tower from the boiler and the flue gas entering the SCR reactor from the SO 2 absorption tower are mutually isolated when flowing through the electric dust collector, SO that the condition of mutual interference between two flowing flue gas is avoided;
The flue gas enters into the inside of SCR reactor through the input tube and carries out the denitration, ammonia input subassembly carries ammonia to the transport of input tube simultaneously, ammonia and flue gas mutually independent carry to the inside of input tube, the inside equal ratio subassembly that admits air carries ammonia and flue gas, the flue gas is by the boiler exhaust back, the inside initiative at the input tube is to the inside transport of equal ratio subassembly that admits air, the air input of the equal ratio subassembly that admits air according to the air input control ammonia of flue gas simultaneously, thereby make when the discharge of flue gas reduces, the input that the equal ratio subassembly that admits air can synchronous control ammonia reduces, thereby be favorable to avoiding the unstable time of discharge of flue gas, ammonia is extravagant that the continuous input caused, finally lead to the condition emergence of ammonia escape.
Preferably, the equal ratio air intake assembly comprises:
The two separation boxes are vertically aligned and fixed in the input pipe, and a yielding groove is reserved between the two separation boxes;
The air pump is fixed in the lower part of the blocking box and is used for actively conveying the ammonia gas in the ammonia gas input cavity to the ammonia gas pushing cavity;
The separation plate is slidably arranged in the input pipe, two transverse plates are vertically and symmetrically fixed at the middle part of one side of the separation plate, the two transverse plates are both slidably connected in the abdication groove, the space above the transverse plates is called a flue gas pushing cavity, and the space below the transverse plates is called an ammonia pushing cavity;
The two one-way valves are respectively inserted into the two separation boxes in a penetrating way, so that smoke enters the smoke pushing cavity in a one-way along the smoke input cavity, and ammonia enters the ammonia pushing cavity in a one-way along the ammonia input cavity;
the driving piece is used for driving the partition plate to move;
The spraying assembly is arranged on the partition plate, so that the gas in the flue gas pushing cavity and the gas in the ammonia pushing cavity are sprayed out along the spraying assembly;
After the flue gas is discharged from the boiler, the discharged flue gas is conveyed to a flue gas input cavity in the input pipe, the flue gas in the flue gas input cavity is gradually accumulated and then has certain air pressure, the flue gas passes through a check valve above the flue gas input cavity under the action of the air pressure, so that the flue gas passes through a baffle box and enters the flue gas pushing cavity, the air pressure is gradually increased after the flue gas enters the flue gas pushing cavity, the partition plate is pushed to move under the action of the flue gas pressure in the flue gas pushing cavity, the upper flue gas pushing cavity and the lower ammonia pushing cavity are synchronously expanded under the action of the air pressure of the lower ammonia pushing cavity, the air pressure of the lower ammonia pushing cavity is reduced, and under the action of the air pressure difference, the ammonia gas in the ammonia gas input cavity is pumped to enter the ammonia pushing cavity through the check valve below, so that the ammonia gas enters the flue gas pushing cavity and the flue gas pushing cavity are synchronously carried out, and the flue gas and the ammonia gas are synchronously input according to a specified proportion are facilitated;
When the discharge speed of the flue gas is unstable, if the discharge speed of the flue gas is reduced, the flue gas enters the flue gas pushing cavity to push the expansion speed of the flue gas pushing cavity to be reduced along with the expansion speed of the flue gas pushing cavity, so that the speed of ammonia entering the ammonia pushing cavity from the lower part is changed along with the expansion speed of the flue gas pushing cavity, the constant speed input of the ammonia is avoided, the input speed of the ammonia is caused to be greater than the input speed of the flue gas, the input proportion of the ammonia is caused to be offset, the condition of ammonia waste is caused, and the condition of ammonia escape caused by the imbalance of the ammonia input is avoided by adjusting the input speed of the ammonia according to the input speed of the flue gas;
When the partition plate is pushed to a final position, the driving piece starts to push the partition plate to reset, at the moment, under the action of the one-way valve, the smoke in the smoke pushing cavity and the ammonia in the ammonia pushing cavity are not discharged in a retrograde way by the one-way valve, but are sprayed by the spraying component, so that the smoke and the ammonia are synchronously sprayed, and the smoke and the ammonia are synchronously output according to a specified proportion, so that the denitration efficiency of the smoke is improved;
The second air pressure sensor can detect the air pressure inside the ammonia pushing cavity, the third air pressure sensor can detect the air pressure inside the flue gas pushing cavity, when the air pressure inside the ammonia pushing cavity is detected to be smaller than the air pressure inside the flue gas pushing cavity, the flue gas concentration inside the flue gas pushing cavity is indicated to be larger than the ammonia concentration inside the ammonia pushing cavity, the air pump is started at the moment, the air pump can actively convey the ammonia inside the ammonia input cavity to the inside of the ammonia pushing cavity until the air pressure detected by the second air pressure sensor inside the ammonia pushing cavity is equal to the air pressure detected by the third air pressure sensor inside the flue gas pushing cavity, so that the air pressure inside the ammonia pushing cavity and the air pressure inside the flue gas pushing cavity are balanced, namely the proportion of the flue gas and the ammonia is the same under the same volume effect, the flue gas and the ammonia are synchronously output according to the stipulated proportion, and the denitration efficiency of the flue gas is improved.
Preferably, the stoichiometric air intake assembly further comprises:
the buffer bin is fixed at the bottom of the input pipe and is communicated with the flue gas input cavity through the bottom;
The piston plate is slidably arranged in the buffer bin;
the mounting plate is fixed on the inner wall of the surge bin, and a pressure spring is fixed between the mounting plate and the piston plate;
The second cylinder is fixed at the top of the mounting plate, and a telescopic rod of the second cylinder is used for pushing the piston plate to move downwards;
the first air pressure sensor is fixed at the bottom of the piston plate;
When the baffle resets and removes the discharge of carrying out flue gas and ammonia, the inside exhaust flue gas of boiler is accumulated in the inside of flue gas input chamber all the time, the telescopic link start retraction of control second cylinder this moment, if the inside accumulated flue gas of flue gas input chamber causes atmospheric pressure to increase this moment, promote the piston board and upwards move under the atmospheric pressure effect that increases, promote the compression of pressure spring after the piston board upwards moves, thereby be favorable to making the flue gas keep in the inside of surge bin temporarily, be favorable to keeping the inside pressure constancy of flue gas input chamber, when the baffle is removed to the laminating and is promoted the removal again under the flue gas effect, the telescopic link start of control second cylinder is released, thereby promote the flue gas and pass the check valve and get into the inside that the flue gas promoted the chamber.
Preferably, the method further comprises:
The magnet grooves are arranged in the blocking box below in a linear array, and magnets are fixed in all the magnet grooves;
The electromagnets are arranged in one-to-one correspondence with the magnets, are fixed on the side edges of the partition plates in a linear array, and attract the corresponding different magnetic poles of the magnets;
After the electromagnet starts, the corresponding magnet can be subjected to adsorption force through magnetic force, the external sleeve of the magnet is provided with sealing rubber, so that the magnet has sealing effect at the edge contact position of the ammonia pushing cavity after extending out, the corresponding magnet receives the adsorption force effect of the magnet and is attached to the partition plate, and meanwhile, the magnet can synchronously move with the partition plate under the action of magnetic attraction, so that the space of the ammonia pushing cavity is adjusted through the effect of the magnet, and the synchronous adjustment of smoke and ammonia according to the proportion is facilitated when the partition plate moves, so that the extension of different magnets according to the proportion requirement of the smoke and the ammonia is facilitated, and the demand proportion of the smoke and the ammonia is facilitated to be adjusted.
Preferably, the spray assembly comprises:
The rotating discs are divided into an upper row and a lower row, the two rows are arranged on the side wall of the partition plate in a linear array in a rotating mode, and the rotating discs penetrate through the partition plate;
the brackets are arranged in one-to-one correspondence with the rotating discs and fixed on the side walls of the partition plates, and the brackets rotatably support the rotating discs;
A plurality of spray heads are fixed on each rotating disc in an arc array, and the spray heads are used for controlling the spraying of gas;
The support can support the rolling disc, be provided with a plurality of shower nozzles on the rolling disc, make the division board when removing to the separation case, can promote flue gas and ammonia along shower nozzle blowout, a plurality of shower nozzles that set up can make flue gas and ammonia evenly dispersed blowout, the shower nozzle is the slope setting, and be circumference array setting, thereby can produce the convection current by relative blowout when making flue gas and ammonia output, thereby be favorable to flue gas and ammonia evenly mixing, thereby be favorable to improving the denitration efficiency to the flue gas, and through flue gas and ammonia evenly mixing, be favorable to reducing the escape of ammonia, thereby be favorable to the make full use of ammonia, be favorable to avoiding the harmful effects that ammonia escape caused to the environment.
Preferably, the spray assembly further comprises:
the bevel gears are arranged in one-to-one correspondence with the rotating discs, and are fixed on the outer walls of the corresponding rotating discs;
the torsion springs are arranged in one-to-one correspondence with the rotating discs, and two ends of each torsion spring are fixedly connected with the corresponding rotating disc and the corresponding bracket respectively;
the straight rods are fixed in the abdication grooves and extend towards the rotating disc, a plurality of racks are fixed on the upper side and the lower side of each straight rod in a linear array, grooves are reserved between adjacent racks, and the bevel gears are meshed with the adjacent racks;
The helical gear is driven to synchronously move in the moving process of the rotating disc, the helical gear is meshed with the rack when moving to the position of the rack, the helical gear is driven to rotate under the meshing action, the helical gear drives the rotating disc to rotate, so that the spray head on the rotating disc is driven to rotate and adjust the position, when the helical gear moves to reach the groove through the rack, the helical gear loses the meshing action, the rotating disc is driven to rotate and reset under the action of the torsion spring, so that the spray head is driven to rotate and reset through the interval arrangement of the rack and the groove, the spray head is driven to reciprocate, the spray position of the spray head is regulated to be favorable for promoting the uniform mixing of flue gas and ammonia gas, and the denitration efficiency of the flue gas is improved.
Preferably, the method further comprises:
the four arc plates are arranged in an elliptic array and fixed in the input pipe, and are positioned on one side of the partition plate facing the inside of the SCR reactor;
the two fans are arranged in a central symmetry manner and fixed on the side edges of the arc-shaped plate;
a plurality of arc-shaped guide teeth which are fixed on the side wall of the arc-shaped plate and are used for guiding airflow to flow spirally;
The fans can drive airflow to flow after being started, when the airflow flows, the two fans move along the arc-shaped curve of the arc-shaped plate under the guiding action of the arc-shaped plate, and the driving directions of the two fans to the airflow are opposite, so that the air in the input pipe flows spirally along the elliptical tracks of the four arc-shaped plates under the action of the fans, thereby being beneficial to driving the mixing of the flue gas and the ammonia gas in the airflow, and further being beneficial to improving the denitration efficiency of the flue gas;
The middle part of the SCR reactor is provided with the catalyst, and the arc-shaped guide teeth are arranged, so that airflow is guided to flow towards the catalyst direction inside the SCR reactor along with the flowing process of the arc-shaped plate, and the airflow is guided to flow to the catalyst to promote the reaction, so that the denitration efficiency of the flue gas is improved due to the promotion of the reaction.
In a second aspect, a control method of a sintering flue gas SCR denitration device based on dry desulfurization is provided, a controller is fixed on an outer wall of the SCR reactor, a second air pressure sensor and a third air pressure sensor are fixed on a side wall of the partition plate, the second air pressure sensor is located in the ammonia pushing cavity, and the third air pressure sensor is located in the flue gas pushing cavity, and the control method includes the following steps:
The controller receives the flue gas pressure information P 1 acquired by the third air pressure sensor;
The controller receives the ammonia gas pressure information P 2 acquired by the second gas pressure sensor and brings the ammonia gas pressure information into a judgment formula P 1＞P2, and when the judgment formula is met, the controller generates ventilation control information, wherein the ventilation control information is used for controlling the starting of the air pump;
The controller sends the ventilation control information to the air pump to control the air pump to start up until P 1＝P2;
The third air pressure sensor can detect the air pressure in the flue gas pushing cavity, the third air pressure sensor detects the flue gas air pressure information P 1 in the flue gas pushing cavity, and sends the flue gas air pressure information P 1 to the controller, the second air pressure sensor can detect the air pressure in the ammonia pushing cavity, the second air pressure sensor detects the ammonia air pressure information P 2 in the ammonia pushing cavity, and sends the ammonia air pressure information P 2 to the controller, the controller brings the ammonia air pressure information P 2 and the flue gas air pressure information P 1 into the judgment formula P 1＞P2 together after receiving the ammonia air pressure information P 2, when the judgment meets the judgment formula, the controller generates ventilation control information according to the judgment result, and sends the ventilation control information to the air pump to control the air pump to start, so that the air pump actively conveys ammonia gas in the ammonia gas input cavity to the ammonia pushing cavity until the second air pressure sensor detects that the ammonia air pressure information P 2 in the ammonia pushing cavity is equal to the air pressure information P 1, and then the air pump is controlled to stop conveying the ammonia.
Preferably, a first pressure sensor is fixed on one side of the partition plate facing the blocking box, and a second pressure sensor is fixed on the other side of the partition plate, and the device further comprises:
The controller receives first pressure information generated when the first pressure sensor is pressurized;
the controller generates extension control information according to the first pressure information, wherein the extension control information is used for controlling the second cylinder to start the retraction telescopic end;
the controller sends the extension control information to the second cylinder to control the second cylinder to start the retraction telescopic end;
the controller receives second pressure information generated by a second pressure sensor when pressurized;
The controller generates reset control information according to the second pressure information, and the reset control information is used for controlling the second cylinder to start to extend out of the telescopic end;
The controller sends the reset control information to the second cylinder so as to control the second cylinder to start extending the telescopic end;
When the partition plate moves to the extrusion separation box, the first pressure sensor receives extrusion to generate first pressure information and sends the first pressure information to the controller, the controller receives the first pressure information and then generates extension control information according to the first pressure information, the controller sends the extension control information to the second cylinder to control the second cylinder to start to retract the telescopic end, when the telescopic end of the second cylinder is retracted, the telescopic end of the second cylinder cannot block the movement of the partition plate, the partition plate can be pushed to move towards the second cylinder under the action of air pressure, when the partition plate moves to the telescopic end for extruding the retraction of the second cylinder, the second pressure sensor is pressed to generate second pressure information and sends the second pressure information to the controller, the controller generates reset control information according to the second pressure information after receiving the second pressure information, and the controller sends the reset control information to the second cylinder to control the second cylinder to start to extend the telescopic end, so that the second cylinder can move towards the separation box to reset through the extension telescopic end.
Preferably, a warning lamp is fixed on the outer wall of the SCR reactor, and the method further comprises:
the controller receives air pressure judgment information P 3 acquired by the first air pressure sensor;
The controller compares the air pressure judging information P 3 with the warning air pressure information P 0, and when the air pressure judging information P 3 is larger than the warning air pressure information P 0, the controller generates warning control information;
the controller sends the warning control information to a warning lamp so as to control the warning lamp to be lightened;
The first air pressure sensor detects the air pressure in the flue gas input cavity, and sends detection result air pressure judging information P 3 to the controller, a worker can manually input warning air pressure information P 0 through the controller, warning air pressure information P 0 is the highest critical value of air pressure, the controller compares air pressure judging information P 3 with warning air pressure information P 0 after receiving air pressure judging information P 3, when air pressure judging information P 3 is larger than warning air pressure information P 0, the controller generates warning control information, then the controller sends warning control information to the warning lamp to control the warning lamp to be on, when air pressure judging information P 3 is smaller than or equal to warning air pressure information P 0, the controller is in a safe stage, and the controller does not control the warning lamp.
Compared with the prior art, the invention has the following beneficial effects:
1. According to the invention, through the arrangement of the equal-ratio air inlet assembly, the equal-ratio air inlet assembly controls the air inflow of ammonia according to the air inflow of the flue gas, so that when the flue gas emission is reduced, the equal-ratio air inlet assembly can synchronously control the reduction of the input amount of the ammonia, thereby being beneficial to avoiding the waste of the ammonia caused by continuous input of the ammonia when the flue gas emission is unstable and finally causing the condition of ammonia escape.
2. According to the invention, through the arrangement of the buffer bin, the piston plate is pushed to move upwards under the action of increased air pressure, so that the temporary storage of the flue gas in the buffer bin is facilitated, and the constant pressure in the flue gas input cavity is facilitated.
3. According to the invention, through the arrangement of the magnets, the flue gas and the ammonia gas are synchronously regulated according to the proportion when the partition plate moves, so that the different magnets can be regulated to extend according to the proportion requirement of the flue gas and the ammonia gas, and the requirement proportion of the flue gas and the ammonia gas can be regulated.
Drawings
FIG. 1 is a schematic flow chart of the method of the present invention.
Fig. 2 is a schematic diagram of the overall structure of the present invention.
Fig. 3 is an enlarged schematic view of the structure of fig. 2 a according to the present invention.
Fig. 4 is a schematic view of a cross-section of an SCR reactor according to the present invention.
Fig. 5 is an enlarged schematic view of the structure of fig. 4B according to the present invention.
Fig. 6 is a schematic diagram of a cross-section of an SCR reactor according to the present invention.
Fig. 7 is an enlarged schematic view of the structure of fig. 6C according to the present invention.
Fig. 8 is an enlarged schematic view of the structure of fig. 7D according to the present invention.
Fig. 9 is a schematic diagram of a cross-section of an SCR reactor according to the present invention.
Fig. 10 is an enlarged schematic view of the structure of fig. 9E according to the present invention.
Fig. 11 is a schematic diagram of a cross-section of an SCR reactor according to the present invention.
Fig. 12 is an enlarged schematic view of the structure of fig. 11 at F according to the present invention.
In the figure: 1. a boiler; 2. a heat exchanger; 3. electric dust remover; SO 2 4 and an absorption tower; 5. an SCR reactor; 501. an input tube; 502. an ammonia gas input chamber; 503. a flue gas input cavity; 504. a flue gas pushing cavity; 505. an ammonia pushing cavity; 506. a relief groove; 601. an ammonia storage tank; 602. an atomizer; 603. an ammonia/air mixer; 604. a connecting pipe; 7. a blocking box; 701. a one-way valve; 8. a partition plate; 801. a first cylinder; 802. a cross plate; 9. a rotating disc; 901. a bracket; 902. a torsion spring; 903. a spray head; 10. bevel gear; 11. a straight rod; 1101. a groove; 1102. a rack; 12. a buffer bin; 1201. a second cylinder; 1202. a pressure spring; 1203. a mounting plate; 13. a first air pressure sensor; 14. a second air pressure sensor; 15. a third air pressure sensor; 16. an arc-shaped plate; 17. a blower; 18. arc-shaped guide teeth; 19. an air pump; 20. a magnet; 2001. a magnet groove; 2002. an electromagnet.
Detailed Description
The following description is presented to enable one of ordinary skill in the art to make and use the invention. The preferred embodiments in the following description are by way of example only and other obvious variations will occur to those skilled in the art.
The sintering flue gas SCR denitration device based on dry desulfurization as shown in fig. 2 to 12 comprises a heat exchanger 2, an electric dust collector 3, an SO 2 absorption tower 4 and an SCR reactor 5, flue gas discharged by a boiler 1 reaches the SO 2 absorption tower 4 for desulfurization after being dedusted by the electric dust collector 3, and the flue gas after desulfurization reaches the SCR reactor 5 for denitration treatment after being dedusted by the electric dust collector 3, and the heat exchanger 2 exchanges heat for the flue gas passing through the device further comprises:
An ammonia gas input assembly for inputting ammonia gas into the SCR reactor 5 to perform denitration;
The SCR reactor 5 comprises an input pipe 501 at one end, the input pipe 501 is divided into an upper flue gas input cavity 503 and a lower ammonia input cavity 502 by a partition plate, the ammonia input cavity 502 is communicated with an ammonia input assembly, and the flue gas input cavity 503 is communicated with the boiler 1;
The equal ratio air inlet assembly is arranged in the input pipe 501 and is used for releasing the flue gas input by the flue gas input cavity 503 and the ammonia gas input by the ammonia gas input cavity 502 in equal ratio, so that the flue gas and the ammonia gas enter the SCR reactor 5 according to fixed ratio;
The ammonia escape control is a technical measure for effectively managing and reducing ammonia NH 3 which is directly discharged to the atmosphere without participating in the reaction in the process of treating the flue gas by adopting denitration technologies such as selective catalytic reduction SCR and the like, and the ammonia escape not only causes resource waste, but also can form secondary pollution, such as environmental problems caused by ammonium salt generation or adverse effects on human health, so that the mixing process of the flue gas and the ammonia is required to be optimized, the mixing uniformity of NH 3 and the flue gas is improved, and the reaction is ensured to be sufficient;
The embodiment of the invention can solve the problems, and the specific implementation manner is that the flue gas discharged from the boiler 1 firstly passes through the electric dust collector 3 to remove dust and then reaches the SO 2 absorption tower 4 to carry out desulfurization, the flue gas after desulfurization passes through the electric dust collector 3 to reach the SCR reactor 5 to carry out denitration treatment, the heat exchanger 2 exchanges heat on the passing flue gas, and the flue gas entering the SO 2 absorption tower 4 from the boiler 1 and the flue gas entering the SCR reactor 5 from the SO 2 absorption tower 4 are mutually isolated when flowing through the electric dust collector 3, SO that the condition of mutual interference between two flowing flue gases is avoided;
The flue gas enters into the inside of SCR reactor 5 through input tube 501 and carries out the denitration, ammonia input subassembly carries ammonia to the transport of input tube 501 simultaneously, ammonia and flue gas mutually independent carry to the inside of input tube 501, the inside equal ratio subassembly that advances of input tube 501 carries ammonia and flue gas equal ratio, after the flue gas is discharged by boiler 1, the inside initiative at input tube 501 carries to the inside of equal ratio subassembly that advances, the air input of the equal ratio subassembly that advances simultaneously controls the air input of ammonia according to the air input of flue gas, thereby make when the discharge of flue gas reduces, the input that equal ratio subassembly that advances can synchronous control ammonia reduces, thereby be favorable to avoiding when the discharge of flue gas is unstable, ammonia continuously inputs the ammonia waste that causes, finally the condition that leads to the ammonia escape takes place.
As an alternative embodiment, the ammonia gas input assembly comprises:
An ammonia storage tank 601, wherein an atomizer 602 is fixed at the output end of the ammonia storage tank 601;
the ammonia/air mixer 603, the ammonia/air mixer 603 is communicated with the output end of the atomizer 602, the other end of the ammonia/air mixer 603 is communicated with the connecting pipe 604, and one end of the connecting pipe 604, which is opposite to the ammonia/air mixer 603, is communicated with the ammonia gas input cavity 502 of the input pipe 501;
The inside of ammonia storage tank 601 can carry out the storage of liquid ammonia, and the liquid ammonia of storage converts ammonia into ammonia under atomizer 602's effect, and ammonia mixes with the air under ammonia/air mixer 603's effect to adjust the concentration of ammonia, thereby be favorable to adjusting suitable ammonia concentration and carry the ammonia input chamber 502 to the inside of input tube 501 through connecting pipe 604, thereby realize the input of ammonia.
As an alternative embodiment, the equal ratio air intake assembly includes:
Two separation boxes 7 are vertically aligned and fixed in the input pipe 501, and a yielding groove 506 is reserved between the two separation boxes 7;
The air pump 19 is fixed in the lower barrier box 7 and is used for actively conveying the ammonia gas in the ammonia gas input cavity 502 to the ammonia gas pushing cavity 505;
The partition plate 8 is slidably mounted in the input pipe 501, two transverse plates 802 are symmetrically fixed up and down towards the middle of one side of the partition box 7 of the partition plate 8, the two transverse plates 802 are slidably connected in the abdication groove 506, the space above the upper transverse plate 802 is called a flue gas pushing cavity 504, and the space below the lower transverse plate 802 is called an ammonia pushing cavity 505;
The two one-way valves 701 are respectively inserted into the two barrier boxes 7 in a penetrating way, so that the flue gas enters the flue gas pushing cavity 504 along the flue gas input cavity 503 in a one-way, and the ammonia enters the ammonia pushing cavity 505 along the ammonia input cavity 502 in a one-way;
A driving member for driving the partition plate 8 to move;
a spraying assembly installed on the partition plate 8 so that the gas inside the smoke pushing chamber 504 and the ammonia pushing chamber 505 is sprayed along the spraying assembly;
after the flue gas is discharged from the boiler 1, the discharged flue gas is conveyed to a flue gas input cavity 503 in the input pipe 501, the flue gas in the flue gas input cavity 503 is gradually accumulated and then has certain air pressure, the flue gas passes through a check valve 701 at the upper part under the action of the air pressure, so that the flue gas passes through a baffle box 7 and enters the flue gas pushing cavity 504, the air pressure is gradually increased after the flue gas enters the flue gas pushing cavity 504, a partition plate 8 is pushed to move under the action of the air pressure of the flue gas in the flue gas pushing cavity 504, the partition plate 8 is moved to enable the flue gas pushing cavity 504 at the upper part and an ammonia pushing cavity 505 at the lower part to be synchronously expanded, and the air pressure of the ammonia pushing cavity 505 at the lower part is reduced after the ammonia pushing cavity 505 is expanded, so that under the action of an air pressure difference, the ammonia gas in the ammonia gas pumping cavity 502 passes through the check valve 701 at the lower part and enters the inside of the ammonia pushing cavity 505, so that the ammonia gas and the flue gas enter the flue gas pushing cavity 504 are synchronously carried out, and the ammonia gas are synchronously input, so that the flue gas and the ammonia gas are favorable to be input synchronously according to a specified proportion;
when the discharge speed of the flue gas is unstable, if the discharge speed of the flue gas is reduced, the flue gas enters the flue gas pushing cavity 504 to push the expansion speed of the flue gas pushing cavity 504 to be reduced, so that the speed of ammonia below entering the ammonia pushing cavity 505 is changed along with the expansion speed, thereby being beneficial to avoiding the condition that when the discharge speed of the flue gas is reduced, the input speed of the ammonia is kept constant and is greater than that of the flue gas, the input proportion of the ammonia is offset, and the ammonia waste is caused, and being beneficial to avoiding the condition that ammonia escapes due to the offset of the ammonia input by adjusting the input speed of the ammonia according to the input speed of the flue gas;
When the partition plate 8 is pushed to the final position, the driving piece starts to push the partition plate 8 to reset, at the moment, under the action of the one-way valve 701, the flue gas in the flue gas pushing cavity 504 and the ammonia gas in the ammonia pushing cavity 505 are not discharged in a retrograde way by the one-way valve 701, but are sprayed by the spraying component, so that the flue gas and the ammonia gas are synchronously sprayed, and the flue gas and the ammonia gas are synchronously output according to a specified proportion, so that the denitration efficiency of the flue gas is improved;
The second air pressure sensor 14 can detect the air pressure inside the ammonia pushing cavity 505, the third air pressure sensor 15 can detect the air pressure inside the flue gas pushing cavity 504, when the air pressure inside the ammonia pushing cavity 505 is detected to be smaller than the air pressure inside the flue gas pushing cavity 504, the flue gas concentration inside the flue gas pushing cavity 504 is larger than the ammonia concentration inside the ammonia pushing cavity 505, the air pump 19 is started at this time, the air pump 19 can actively convey the ammonia inside the ammonia input cavity 502 to the inside of the ammonia pushing cavity 505 until the air pressure detected by the second air pressure sensor 14 inside the ammonia pushing cavity 505 is equal to the air pressure detected by the third air pressure sensor 15 inside the flue gas pushing cavity 504, so that the air pressures inside the ammonia pushing cavity 505 and the flue gas pushing cavity 504 are balanced, namely, the proportion of the flue gas and the ammonia is the same, so that the flue gas and the ammonia are synchronously output according to the specified proportion, and the denitration efficiency of the flue gas is improved.
As an alternative embodiment, the driving member includes a plurality of first cylinders 801, fixed inside the input pipe 501, and the first cylinders 801 push the partition plate 8 to move through the telescopic ends;
When the partition plate 8 is pushed to a final position by smoke, namely, when the partition plate 8 is pushed to the end part of the telescopic rod of the first air cylinder 801, the first air cylinder 801 is started, the partition plate 8 is pushed by the telescopic rod after the first air cylinder 801 is started, so that the partition plate 8 is pushed to move, the smoke pushing cavity 504 and the air inside the ammonia pushing cavity 505 are pushed to be discharged through the spraying assembly, the smoke and the ammonia are driven to be synchronously discharged, after the partition plate 8 is pushed to be moved to the attaching blocking box 7, the first air cylinder 801 is started to reset, the first air cylinder 801 can not block the movement of the partition plate 8, and the partition plate 8 can be pushed to move again under the action of the smoke.
As an alternative embodiment, the equal ratio air intake assembly further comprises:
the buffer bin 12 is fixed at the bottom of the input pipe 501 and is communicated with the flue gas input cavity 503 through the bottom;
a piston plate 1204 slidably mounted inside the surge bin 12;
A mounting plate 1203 fixed to the inner wall of surge bin 12, a pressure spring 1202 being fixed between mounting plate 1203 and piston plate 1204;
A second cylinder 1201 fixed to the top of the mounting plate 1203, the telescopic rod of the second cylinder 1201 being used to push the piston plate 1204 to move downward;
A first air pressure sensor 13 fixed to the bottom of the piston plate 1204;
When the baffle plate 8 is reset to move to discharge the flue gas and the ammonia gas, the flue gas discharged from the interior of the boiler 1 is always accumulated in the interior of the flue gas input cavity 503, at this time, the telescopic rod of the second cylinder 1201 is controlled to start to retract, at this time, if the flue gas accumulated in the interior of the flue gas input cavity 503 causes the air pressure to increase, the piston plate 1204 is pushed to move upwards under the action of the increased air pressure, the piston plate 1204 moves upwards to push the pressure spring 1202 to compress, thereby being beneficial to temporarily storing the flue gas in the buffer bin 12, being beneficial to keeping the pressure in the interior of the flue gas input cavity 503 constant, and when the baffle plate 8 is pushed to move again under the action of the flue gas after moving to the attaching baffle box 7, the telescopic rod of the second cylinder 1201 is controlled to start to push out, so that the flue gas is pushed to pass through the one-way valve 701 to enter the interior of the flue gas pushing cavity 504.
As an alternative embodiment, further comprising:
a plurality of magnet slots 2001 which are arranged in a linear array in the lower baffle box 7, and magnets 20 are fixed in all the magnet slots 2001;
A plurality of electromagnets 2002, which are arranged in one-to-one correspondence with the magnets 20, wherein the electromagnets 2002 are fixed on the side edges of the partition plate 8 in a linear array, and the electromagnets 2002 attract different magnetic poles of the corresponding magnets 20;
After the electromagnet 2002 starts, the corresponding magnet 20 can be attracted through magnetic force, the sealing rubber is sleeved outside the magnet 20, so that the magnet 20 has a sealing effect with the edge contact position of the ammonia pushing cavity 505 after extending, the corresponding magnet 20 receives the attraction force of the magnet 20 to be attached to the partition plate 8, meanwhile, the magnet 20 can synchronously move with the partition plate 8 under the action of magnetic attraction force, the space of the ammonia pushing cavity 505 is adjusted through the action of the magnet 20, synchronous adjustment of smoke and ammonia according to the proportion is facilitated when the partition plate 8 moves, and accordingly different magnets 20 are required to be adjusted according to the proportion of the smoke and the ammonia to extend, and the demand proportion of the smoke and the ammonia is facilitated to be adjusted.
As an alternative embodiment, the spray assembly comprises:
A plurality of rotating discs 9 which are divided into an upper row and a lower row, wherein the two rows are rotatably arranged on the side wall of the partition plate 8 in a linear array, and the rotating discs 9 penetrate through the partition plate 8;
A plurality of brackets 901, which are arranged in one-to-one correspondence with the rotating discs 9, wherein the brackets 901 are fixed on the side walls of the partition plates 8, and the brackets 901 rotatably support the rotating discs 9;
a plurality of spray heads 903, wherein each rotating disk 9 is fixed with a plurality of spray heads 903 in an arc array, and the spray heads 903 are used for controlling the spraying of gas;
Support 901 can support rolling disc 9, be provided with a plurality of shower nozzles 903 on the rolling disc 9, make division board 8 when removing to separation case 7, can promote flue gas and ammonia along shower nozzle 903 blowout, a plurality of shower nozzles 903 of setting can make flue gas and ammonia evenly dispersed blowout, shower nozzle 903 is the slope setting, and be circumference array setting, thereby can produce the convection current by relative blowout when making flue gas and ammonia output, thereby be favorable to the evenly mixing of flue gas and ammonia, thereby be favorable to improving the denitration efficiency to the flue gas, and through the evenly mixing of flue gas and ammonia, be favorable to reducing the escape of ammonia, thereby be favorable to the make full use of ammonia escape to the adverse effect that the environment caused is favorable to avoiding.
As an alternative embodiment, the spray assembly further comprises:
the bevel gears 10 are arranged in one-to-one correspondence with the rotating discs 9, and the bevel gears 10 are fixed on the outer walls of the corresponding rotating discs 9;
the torsion springs 902 are arranged in one-to-one correspondence with the rotating discs 9, and two ends of each torsion spring 902 are fixedly connected with the corresponding rotating disc 9 and the corresponding bracket 901 respectively;
A plurality of straight rods 11 fixed in the abdication grooves 506 and extending towards the rotating disc 9, wherein a plurality of racks 1102 are fixed on the upper side and the lower side of each straight rod 11 in a linear array, grooves 1101 are reserved between adjacent racks 1102, and the bevel gears 10 are meshed with the adjacent racks 1102;
The helical gear 10 is driven to synchronously move in the moving process of the rotating disc 9, the helical gear 10 is meshed with the rack 1102 when moving to the position of the rack 1102, the helical gear 10 is driven to rotate under the meshing effect, the helical gear 10 drives the rotating disc 9 to rotate, so that the spray nozzle 903 on the rotating disc 9 is driven to rotate to adjust the position, when the helical gear 10 moves to reach the groove 1101 through the rack 1102, the helical gear 10 loses the meshing effect, the rotating disc 9 is driven to rotate to reset under the action of the torsion spring 902, so that the spray nozzle 903 is driven to rotate to reset, the spray nozzle 903 is driven to rotate and reset in a reciprocating manner through the interval between the rack 1102 and the groove 1101, and the spray position of the spray nozzle 903 is regulated in a reciprocating manner, so that uniform mixing of smoke and ammonia gas is promoted, and denitration efficiency of the smoke is improved.
As an alternative embodiment, further comprising:
Four arc plates 16, which are arranged in an oval array and fixed inside the input pipe 501, are positioned on one side of the partition plate 8 facing the inside of the SCR reactor 5;
the two fans 17 are arranged in a central symmetry manner and fixed on the side edges of the arc-shaped plate 16;
a plurality of arc-shaped guide teeth 18 fixed to the side wall of the arc-shaped plate 16 for guiding the air flow to flow spirally;
The fans 17 can drive airflow to flow after being started, when the airflow flows, the fans move along the arc curves of the arc plates 16 under the guiding action of the arc plates 16, and the driving directions of the two fans 17 to the airflow are opposite, so that the air in the input pipe 501 flows spirally along the elliptical tracks of the four arc plates 16 under the action of the fans 17, thereby being beneficial to driving the mixing of the flue gas and the ammonia gas in the airflow, and further being beneficial to improving the denitration efficiency of the flue gas;
The middle part of the SCR reactor 5 is provided with a catalyst, and the arc-shaped guide teeth 18 are arranged, so that air flow is guided to flow towards the catalyst direction inside the SCR reactor 5 along with the flowing process of the arc-shaped plate 16, and the air flow is guided to flow to the catalyst to promote the reaction, so that the denitration efficiency of flue gas is improved due to the promotion of the reaction.
The control method of the dry desulfurization-based sintering flue gas SCR denitration device shown in fig. 1, which is applicable to the dry desulfurization-based sintering flue gas SCR denitration device according to any one of claims 3 to 7, wherein a controller is fixed on the outer wall of the SCR reactor 5, a second air pressure sensor 14 and a third air pressure sensor 15 are fixed on the side wall of the partition plate 8, the second air pressure sensor 14 is located in the ammonia pushing cavity 505, and the third air pressure sensor 15 is located in the flue gas pushing cavity 504, the control method comprises the following steps:
The controller receives the flue gas pressure information P 1 acquired by the third air pressure sensor 15;
The controller receives the ammonia gas pressure information P 2 acquired by the second gas pressure sensor 14 and brings the ammonia gas pressure information into a judgment formula P 1＞P2, and when the judgment formula is met, the controller generates ventilation control information which is used for controlling the starting of the air pump 19;
The controller sends ventilation control information to the air pump 19 to control the air pump 19 to start up until P 1＝P2;
The third air pressure sensor 15 can detect the air pressure inside the flue gas pushing cavity 504, the third air pressure sensor 15 detects the flue gas air pressure information P 1 inside the flue gas pushing cavity 504 and sends the flue gas air pressure information P 1 to the controller, the second air pressure sensor 14 can detect the air pressure inside the ammonia pushing cavity 505, the second air pressure sensor 14 detects the ammonia air pressure information P 2 inside the ammonia pushing cavity 505 and sends the ammonia air pressure information P 2 to the controller, the controller brings the ammonia air pressure information P 2 and the flue gas air pressure information P 1 into the judgment formula P 1＞P2 together after receiving the ammonia air pressure information P 2, when the judgment is in accordance with the judgment formula, the controller generates ventilation control information according to the judgment result and sends the ventilation control information to the air pump 19 to control the air pump 19 to start, so that the air pump 19 actively conveys the ammonia inside the ammonia input cavity 502 to the ammonia pushing cavity 505 until the second air pressure sensor 14 detects the ammonia air pressure information P 2 inside the ammonia pushing cavity 505 is equal to the air pressure information P 1, and then the air pump 19 is controlled to stop conveying the ammonia.
As an alternative embodiment, a first pressure sensor is fixed to one side of the partition plate 8 facing the blocking box 7, and a second pressure sensor is fixed to the other side of the partition plate 8, and further comprising:
the controller receives first pressure information generated when the first pressure sensor is pressed;
The controller generates extension control information according to the first pressure information, wherein the extension control information is used for controlling the second cylinder 1201 to start the retraction telescopic end;
The controller sends extension control information to the second cylinder 1201 to control the second cylinder 1201 to start retracting the telescopic end;
The controller receives second pressure information generated by the second pressure sensor when pressed;
The controller generates reset control information according to the second pressure information, wherein the reset control information is used for controlling the second cylinder 1201 to start extending out of the telescopic end;
the controller sends reset control information to the second air cylinder 1201 to control the second air cylinder 1201 to start extending the telescopic end;
When the partition plate 8 moves to the extrusion blocking box 7, the first pressure sensor receives extrusion to generate first pressure information and sends the first pressure information to the controller, the controller receives the first pressure information and then generates extension control information according to the first pressure information, the controller sends the extension control information to the second air cylinder 1201 to control the second air cylinder 1201 to start retracting the telescopic end, when the telescopic end of the second air cylinder 1201 is retracted, the telescopic end of the second air cylinder 1201 cannot cause obstruction to the movement of the partition plate 8, the partition plate 8 can be pushed to move towards the second air cylinder 1201 under the action of air pressure, when the partition plate 8 moves to the telescopic end for extruding the second air cylinder 1201, the second pressure sensor is pressed to generate second pressure information, and sends the second pressure information to the controller, after receiving the second pressure information, the controller generates reset control information according to the second pressure information, the controller sends the reset control information to the second air cylinder 1201 to control the second air cylinder 1201 to start retracting the telescopic end, and the second air cylinder 1201 can reset the partition plate 1201 to move towards the direction of the extrusion blocking box 7.
As an alternative embodiment, a warning lamp is fixed on the outer wall of the SCR reactor 5, and further includes:
The controller receives the air pressure judgment information P 3 acquired by the first air pressure sensor 13;
The controller compares the air pressure judging information P 3 with the warning air pressure information P 0, and when the air pressure judging information P 3 is larger than the warning air pressure information P 0, the controller generates warning control information;
the controller sends warning control information to the warning lamp so as to control the warning lamp to light up;
The first air pressure sensor 13 detects the air pressure in the flue gas input cavity 503, sends the air pressure judgment information P 3 to the controller, a worker can manually input the warning air pressure information P 0 through the controller, the warning air pressure information P 0 is the highest critical value of air pressure, the controller compares the air pressure judgment information P 3 with the warning air pressure information P 0 after receiving the air pressure judgment information P 3, when the air pressure judgment information P 3 is larger than the warning air pressure information P 0, the controller generates warning control information, then the controller sends the warning control information to the warning lamp to control the warning lamp to be on, and when the air pressure judgment information P 3 is smaller than or equal to the warning air pressure information P 0, the controller is in a safe stage and does not control the warning lamp.
The working principle of the invention is as follows: flue gas discharged from the boiler 1 firstly passes through the electric dust collector 3 to remove dust and then reaches the SO 2 absorption tower 4 to carry out desulfurization, the flue gas after desulfurization passes through the electric dust collector 3 to remove dust and then reaches the SCR reactor 5 to carry out denitration treatment, the heat exchanger 2 exchanges heat on the passing flue gas, and the flue gas entering the SO 2 absorption tower 4 from the boiler 1 and the flue gas entering the SCR reactor 5 from the SO 2 absorption tower 4 are mutually isolated when flowing through the electric dust collector 3, SO that the condition of mutual interference between two flowing flue gas is avoided;
The flue gas enters into the inside of SCR reactor 5 through input tube 501 and carries out the denitration, ammonia input subassembly carries ammonia to the transport of input tube 501 simultaneously, ammonia and flue gas mutually independent carry to the inside of input tube 501, the inside equal ratio subassembly that advances of input tube 501 carries ammonia and flue gas equal ratio, after the flue gas is discharged by boiler 1, the inside initiative at input tube 501 carries to the inside of equal ratio subassembly that advances, the air input of the equal ratio subassembly that advances simultaneously controls the air input of ammonia according to the air input of flue gas, thereby make when the discharge of flue gas reduces, the input that equal ratio subassembly that advances can synchronous control ammonia reduces, thereby be favorable to avoiding when the discharge of flue gas is unstable, ammonia continuously inputs the ammonia waste that causes, finally the condition that leads to the ammonia escape takes place.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made therein without departing from the spirit and scope of the invention, which is defined by the appended claims.
Claims (10)
1. Sintering flue gas SCR denitration device based on dry desulfurization, including heat exchanger (2) and electrostatic precipitator (3), SO 2 absorption tower (4), SCR reactor (5), by boiler (1) exhaust flue gas process get after electrostatic precipitator (3) removes dust SO 2 absorption tower (4) carry out the desulfurization, and flue gas after desulfurization passes through after electrostatic precipitator (3) removes dust reaches SCR reactor (5) carries out denitration treatment, heat exchanger (2) carries out heat transfer to the flue gas of process, its characterized in that still includes:
An ammonia gas input assembly for inputting ammonia gas into the SCR reactor (5) for denitration;
The SCR reactor (5) comprises an input pipe (501) at one end, the input pipe (501) is divided into an upper flue gas input cavity (503) and a lower ammonia input cavity (502) through a separation plate, the ammonia input cavity (502) is communicated with the ammonia input assembly, and the flue gas input cavity (503) is communicated with the boiler (1);
And the equal-ratio air inlet assembly is arranged in the input pipe (501) and is used for releasing the flue gas input by the flue gas input cavity (503) and the ammonia gas input by the ammonia gas input cavity (502) in equal ratio, so that the flue gas and the ammonia gas enter the SCR reactor (5) according to fixed ratio.
2. The dry desulfurization-based sintering flue gas SCR denitration apparatus as set forth in claim 1, wherein the stoichiometric air intake assembly comprises:
Two separation boxes (7) are vertically aligned and fixed in the input pipe (501), and a yielding groove (506) is reserved between the two separation boxes (7);
The air pump (19) is fixed in the barrier box (7) below and is used for actively conveying the ammonia in the ammonia input cavity (502) to the ammonia pushing cavity (505);
The separation plate (8) is slidably mounted in the input pipe (501), two transverse plates (802) are vertically and symmetrically fixed at the middle part of one side of the separation plate (8) facing the separation box (7), the two transverse plates (802) are both slidably connected in the abdication groove (506), a space above the transverse plates (802) is called a flue gas pushing cavity (504), and a space below the transverse plates (802) is called an ammonia pushing cavity (505);
The two one-way valves (701) are respectively inserted into the two barrier boxes (7) in a penetrating way, so that smoke enters the smoke pushing cavity (504) in a one-way along the smoke input cavity (503), and ammonia enters the ammonia pushing cavity (505) in a one-way along the ammonia input cavity (502);
a driving member for driving the partition plate (8) to move;
And the spraying assembly is arranged above the partition plate (8) so that the gas in the flue gas pushing cavity (504) and the ammonia pushing cavity (505) is sprayed out along the spraying assembly.
3. The dry desulfurization-based sintering flue gas SCR denitration apparatus as defined in claim 2, wherein the stoichiometric air intake assembly further comprises:
the buffer bin (12) is fixed at the bottom of the input pipe (501) and is communicated with the flue gas input cavity (503) through the bottom;
A piston plate (1204) slidably mounted within the surge bin (12);
A mounting plate (1203) fixed on the inner wall of the surge bin (12), a pressure spring (1202) being fixed between the mounting plate (1203) and the piston plate (1204);
A second cylinder (1201) fixed to the top of the mounting plate (1203), the telescopic rod of the second cylinder (1201) being used to push the piston plate (1204) to move downwards;
A first air pressure sensor (13) is secured to the bottom of the piston plate (1204).
4. A dry desulfurization based sintering flue gas SCR denitration apparatus as defined in claim 3, further comprising:
a plurality of magnet grooves (2001) which are arranged in a linear array in the blocking box (7) below, wherein magnets (20) are fixed in all the magnet grooves (2001);
the electromagnets (2002) are arranged in one-to-one correspondence with the magnets (20), the electromagnets (2002) are fixed on the side edges of the partition plate (8) in a linear array, and the electromagnets (2002) attract different magnetic poles of the corresponding magnets (20).
5. A dry desulfurization based sintering flue gas SCR denitration apparatus as defined in claim 3, wherein said spray assembly comprises:
A plurality of rotating discs (9) which are divided into an upper row and a lower row, wherein the two rows are arranged on the side wall of the partition plate (8) in a linear array in a rotating way, and the rotating discs (9) penetrate through the partition plate (8);
The brackets (901) are arranged in one-to-one correspondence with the rotating discs (9), the brackets (901) are fixed on the side walls of the partition plates (8), and the brackets (901) rotatably support the rotating discs (9);
and a plurality of spray heads (903) are fixed on each rotating disc (9) in an arc array, and the spray heads (903) are used for controlling the spraying of gas.
6. The dry desulfurization-based sintering flue gas SCR denitration apparatus as defined in claim 5, wherein the spray assembly further comprises:
The bevel gears (10) are arranged in one-to-one correspondence with the rotating discs (9), and the bevel gears (10) are fixed on the outer walls of the corresponding rotating discs (9);
the torsion springs (902) are arranged in one-to-one correspondence with the rotating discs (9), and two ends of each torsion spring (902) are fixedly connected with the corresponding rotating disc (9) and the corresponding bracket (901);
The straight rods (11) are fixed in the abdication grooves (506) and extend towards the rotating disc (9), a plurality of racks (1102) are fixed on the upper side and the lower side of each straight rod (11) in a linear array, grooves (1101) are reserved between every two adjacent racks (1102), and the bevel gears (10) are meshed with the adjacent racks (1102).
7. A dry desulfurization based sintering flue gas SCR denitration apparatus as defined in claim 3, further comprising:
Four arc plates (16) which are arranged in an elliptic array and are fixed in the input pipe (501) and positioned on one side of the partition plate (8) facing the inside of the SCR reactor (5);
The two fans (17) are arranged in a central symmetry manner and are fixed on the side edges of the arc-shaped plate (16);
and a plurality of arc-shaped guide teeth (18) fixed on the side wall of the arc-shaped plate (16) for guiding the airflow to spirally flow.
8. A control method of a dry desulfurization-based sintering flue gas SCR denitration device, which is applicable to the dry desulfurization-based sintering flue gas SCR denitration device according to any one of claims 3 to 7, wherein a controller is fixed on the outer wall of the SCR reactor (5), a second air pressure sensor (14) and a third air pressure sensor (15) are fixed on the side wall of the partition plate (8), the second air pressure sensor (14) is located in the ammonia pushing cavity (505), and the third air pressure sensor (15) is located in the flue gas pushing cavity (504), the control method comprises the following steps:
The controller receives flue gas pressure information P 1 acquired by the third air pressure sensor (15);
The controller receives ammonia gas pressure information P 2 acquired by the second gas pressure sensor (14) and brings the ammonia gas pressure information into a judgment formula P 1＞P2, and when the judgment formula is met, the controller generates ventilation control information, wherein the ventilation control information is used for controlling the starting of the air pump (19);
The controller sends the ventilation control information to the air pump (19) to control the air pump (19) to start up until P 1＝P2.
9. The control method of a dry desulfurization-based sintering flue gas SCR denitration apparatus according to claim 8, wherein a first pressure sensor is fixed to one side of the partition plate (8) toward the blocking box (7), a second pressure sensor is fixed to the other side of the partition plate (8), further comprising:
The controller receives first pressure information generated when the first pressure sensor is pressurized;
The controller generates extension control information according to the first pressure information, wherein the extension control information is used for controlling the second cylinder (1201) to start a retraction telescopic end;
The controller sends the extension control information to the second cylinder (1201) to control the second cylinder (1201) to start retracting the telescopic end;
the controller receives second pressure information generated by a second pressure sensor when pressurized;
The controller generates reset control information according to the second pressure information, wherein the reset control information is used for controlling the second cylinder (1201) to start extending out of the telescopic end;
the controller sends the reset control information to the second air cylinder (1201) to control the second air cylinder (1201) to start extending the telescopic end.
10. The control method of a dry desulfurization-based sintered flue gas SCR denitration device according to claim 8, wherein a warning lamp is fixed on the outer wall of the SCR reactor (5), further comprising:
The controller receives air pressure judgment information P 3 acquired by the first air pressure sensor (13);
The controller compares the air pressure judging information P 3 with the warning air pressure information P 0, and when the air pressure judging information P 3 is larger than the warning air pressure information P 0, the controller generates warning control information;
The controller sends the warning control information to a warning lamp so as to control the warning lamp to be turned on.
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