CN207745694U - A kind of denitrating flue gas desulfurization process system - Google Patents
A kind of denitrating flue gas desulfurization process system Download PDFInfo
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- CN207745694U CN207745694U CN201721536444.2U CN201721536444U CN207745694U CN 207745694 U CN207745694 U CN 207745694U CN 201721536444 U CN201721536444 U CN 201721536444U CN 207745694 U CN207745694 U CN 207745694U
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- flue gas
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/30—Technologies for a more efficient combustion or heat usage
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- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The utility model discloses a kind of denitrating flue gas desulfurization process systems, belong to fume treatment technical field, including passing through the sequentially connected denitrification apparatus of pipeline, desulfurizer and chimney, gas cooler is connected with by pipeline between the denitrification apparatus and the desulfurizer, flue gas heater is connected with by pipeline between the desulfurizer and the chimney；The denitrification apparatus includes flue gas flue gas heat-exchange unit, flue gas vapors heat exchanger and SCR denitration reactor, the flue gas flue gas heat-exchange unit is connected to the gas cooler, the flue gas flue gas heat-exchange unit is connected to smoke inlet, the flue gas vapors heat exchanger is in parallel with the SCR denitration reactor again after connecting with the flue gas flue gas heat-exchange unit, and the exhanst gas outlet of the SCR denitration reactor is connected to the flue gas flue gas heat-exchange unit.Meet denitrating catalyst and keep active temperature requirement, to improve denitration efficiency, reduces the formation of " gypsum rain ", and waste heat recovery is carried out to flue gas after denitration.
Description
Technical field
The utility model is related to fume treatment technical fields, and in particular to a kind of denitrating flue gas desulfurization process system.
Background technology
National energy policy and environmental protection policy are increasingly stringenter the limitation of coal-fired power project at present.Environmental Protection Department, country
The Committee of Development and Reform, National Energy Board print and distribute《Implement in full coal-burning power plant's minimum discharge and reducing energy consumption programme of work》It is required that：2020
Coal-burning power plant's minimum discharge is implemented in full before year, and (i.e. under the conditions of benchmark oxygen content 6%, flue dust, sulfur dioxide, nitrogen oxides are arranged
Put concentration be respectively no higher than 10,35,50mg/m3) and reducing energy consumption, east, middle part will be advanced to 2017 and 2018 and reach
Mark.
At present China using desulfurization+denitrating technique come integrated treatment flue gas.Main method of denitration is selectivity in the market
Noncatalytic reduction (SNCR) and selective catalytic reduction (SCR), SCR denitration technology are the denitrations the most ripe of current technique
The core of technology, SCR technology is catalyst, and SCR catalyst must can be only achieved higher denitration reaction efficiency at a certain temperature,
And at present, the temperature of flue gas is often too low in denitrating system, the temperature that catalyst keeps greater activity is not achieved, so as to cause de-
Nitre is less efficient, and in order to reach preferable denitration efficiency, some are low-temperature catalyzed to go back original systems by the way of electricity or fuel heating,
By flue gas or catalyst heat temperature raising, problem of environmental pollution caused by there is operating cost is higher and aftercombustion.Meanwhile
Often there is " gypsum rain " in desulphurization system, i.e., exhaust gas temperature is too low, is susceptible to the discharge of entrained liquids pollutant, causes
In the case of normal weather, chimney near zone often occurs declining droplet, and very big influence is brought to the lives of the people.
Utility model content
In view of the above technical problems, the utility model provides a kind of denitrating flue gas desulfurization process system, meets denitration catalyst
Agent keeps active temperature requirement, to improve denitration efficiency, by improving exhaust gas temperature, slows down the corrosion of chimney, reduces
The formation of " gypsum rain ", and waste heat recovery is carried out to flue gas after denitration, it is with good economic efficiency.
To achieve the goals above, the technical solution adopted in the utility model is as follows：
A kind of denitrating flue gas desulfurization process system, including pass through the sequentially connected denitrification apparatus of pipeline, desulfurizer and cigarette
Chimney, the denitrification apparatus is interior to be equipped with catalyst, and flue gas is connected with by pipeline between the denitrification apparatus and the desulfurizer
Cooler is connected with flue gas heater between the desulfurizer and the chimney by pipeline；The denitrification apparatus includes cigarette
Gas-flue gas heat-exchange unit, flue gas-vapor heat exchanger and SCR denitration reactor, the flue gas-flue gas heat-exchange unit and the flue gas are cold
But device is connected to, and the flue gas-flue gas heat-exchange unit is connected to smoke inlet, and the flue gas-vapor heat exchanger is changed with the flue gas-flue gas
In parallel with the SCR denitration reactor again, the exhanst gas outlet of the SCR denitration reactor and the flue gas-cigarette after hot device series connection
Gas heat exchanger is connected to.
Preferably, the flue gas-flue gas heat-exchange unit and flue gas-vapor heat exchanger are pipe heat exchanger.
Preferably, the heat exchanger tube of the flue gas-flue gas heat-exchange unit is inside and outside counterenamel pipe, the flue gas-steam heat-exchanging
The heat exchanger tube of device is finned tube, extended surface, to reduce space.
Flue gas-the flue gas heat-exchange unit, flue gas-vapor heat exchanger, SCR denitration reactor, flue gas heater, flue gas cooling
It is equipped with soot blower in device, desulfurizer.
The heat exchanger tube of the flue gas-flue gas heat-exchange unit uses enamel pipe, enhances low temperature resistance to corrosion.
The heat exchanger tube of the flue gas heater and gas cooler is equipped with abrasionproof pipe, before being installed at smoke inlet heat exchanger tube
Two rows prevent flue gas from directly washing away heat exchanger and equipment attrition are caused to aggravate, and play the role of protecting heat exchanger tube, improve heat exchanger
Service life.
The beneficial effects of the utility model are shown：
1. realizing the SCR denitration problem of low-temperature flue gas by the system, ensure that flue-gas temperature meets the anti-of denitrating catalyst
Temperature is answered, ensures denitration efficiency, temperature adjustment is carried out using steam-flue gas heat-exchange unit, compared with other mode of heatings (electrical heating),
Heat exchange area is small, low cost；
2. this system carries out denitrating flue gas after being installed in deduster, the denitration for avoiding former boiler structure not enough
Reaction compartment, while air preheater and the stifled ash of denitrating catalyst are avoided, cause catalyst failure；
3. heating former flue gas by using neat stress, higher temperature fume afterheat further recycles after can making purification,
Steam consumption needed for flue gas-steam heater heating flue gas is reduced, heat loss is reduced；
4. the flue-gas temperature in desulfurizer can be lowered by gas cooler, reduce disappearing for water in desulfurizing tower
Consumption and power consumption；
5. exhaust gas temperature can be improved by flue gas heater, slow down the corrosion of chimney, reduces the formation of " gypsum rain "；
6. gas cooler constitutes waste-heat recovery device with flue gas heater, it is combined with former boiler water cycle system,
Improve generatine set heat efficiency.
Description of the drawings
Fig. 1 is a kind of overall structure diagram of denitrating flue gas desulfurization process system of the utility model.
In figure：1- desulfurizers, 2- chimneys, 3- flue gases-flue gas heat-exchange unit, 4- flue gas vapors heat exchanger, 5-SCR denitrations
Reactor, 6- gas coolers, 7- flue gas heaters, 8- soot blowers, 9- abrasionproofs pipe, 10- smoke inlets.
Specific implementation mode
In order to facilitate the understanding of those skilled in the art, the utility model will be further described below with reference to the accompanying drawings.
A kind of denitrating flue gas desulfurization process system as shown in Figure 1, including pass through the sequentially connected denitrification apparatus of pipeline, de-
Sulphur device 1 and chimney 2, the denitrification apparatus is interior to be equipped with catalyst, passes through pipe between the denitrification apparatus and the desulfurizer 1
Road is connected with gas cooler 6, and flue gas heater 7 is connected with by pipeline between the desulfurizer 1 and the chimney 2；Institute
It includes flue gas-flue gas heat-exchange unit 3, flue gas-vapor heat exchanger 4 and SCR denitration reactor 5, the flue gas-flue gas to state denitrification apparatus
Heat exchanger 3 is connected to the gas cooler 6, and the flue gas-flue gas heat-exchange unit 3 is connected to smoke inlet 10, the flue gas-steaming
Vapour heat exchanger 4 is in parallel with the SCR denitration reactor 5 again after connecting with the flue gas-flue gas heat-exchange unit 3, and the SCR denitration is anti-
The exhanst gas outlet of device 5 is answered to be connected to the flue gas-flue gas heat-exchange unit 3.
Flue gas-the flue gas heat-exchange unit 3 and flue gas-vapor heat exchanger 4 are pipe heat exchanger.Flue gas-the flue gas changes
The heat exchanger tube of hot device 3 is inside and outside counterenamel pipe, and the heat exchanger tube of the flue gas-vapor heat exchanger 4 is finned tube.The flue gas-
Flue gas heat-exchange unit 3, flue gas-vapor heat exchanger 4, SCR denitration reactor 5, flue gas heater 7, gas cooler 6, desulfurizer 1
Inside it is equipped with soot blower 8.The heat exchanger tube of the flue gas-flue gas heat-exchange unit 3 uses enamel pipe.The flue gas heater 7 and flue gas
The heat exchanger tube front two rows of cooler 6 are equipped with abrasionproof pipe 9.
Former flue gas enters from smoke inlet 10, by flue gas-flue gas heat-exchange unit 3 (tube side), is carried out just with high temperature neat stress
Step exchanges heating, using flue gas-vapor heat exchanger 4, is further heated using high-temperature steam, and it is de- that former flue-gas temperature reaches SCR
The catalyst required temperature of nitre reaction enters cigarette by the neat stress of denitration process after the outlet of SCR Benitration reactors 5 discharge
Gas-flue gas heat-exchange unit 3 (shell side) carries out heat exchange with new former flue gas and reacts, and flue-gas temperature tentatively declines, then cold by flue gas
But device 6 exchange heat with condensed water wherein, and neat stress temperature further declines, and enter back into desulfurizer 1 and carry out at desulfurization
Reason, the flue gas come out through desulfurizer 1 enter flue gas heater 7, and flue-gas temperature improves, and is discharged eventually by chimney 2.
Flue gas-flue gas heat-exchange unit 3 is used for the heat exchange of former flue gas and neat stress, preliminary to promote former flue-gas temperature, recycles net cigarette
Gas waste heat, flue gas-vapor heat exchanger 4 are used for the heat exchange of former flue gas and steam, further promote former flue-gas temperature, flue gas-steam
It is high-temperature steam that heat exchanger 4, which uses pipe heat exchanger, pipe endogenous pyrogen, and pipe is outer for former flue gas.Wherein, flue gas-flue gas heat-exchange unit 3
The control of shell side flue gas flow rate is controlled in 7-9m/s, tube side flue gas flow rate in 9-14m/s.Flue gas-vapor heat exchanger 4, flue gas
The heat exchange pipe bend of device 7 and gas cooler 6 may be contained within outside flue, and flue gas is avoided directly to wash away.
Flue gas-the vapor heat exchanger 4 is equipped with air intake and water outlet, and steam enters the flue gas-by pipeline
The flue gas into the flue gas-vapor heat exchanger is transferred heat to after vapor heat exchanger 4, flue gas is heated up, steam drop
It is flowed out by water outlet in the form of condensed water after temperature, pipeline is equipped with steam flow control valve, the cigarette of flue gas-vapor heat exchanger 4
Gas outlet is equipped with temperature sensor, and temperature sensor is electrically connected a controller with steam flow control valve, and temperature passes
The flue-gas temperature of the exhanst gas outlet of the flue gas-vapor heat exchanger 4 detected is sent to controller by sensor, is set in advance in controller
Temperature threshold is set, when the temperature received is less than temperature threshold, controller increases the aperture of steam flow control valve, automatically
Control ensures that the flue-gas temperature into SCR denitration reactor 5 reaches target call.In addition, the flue gas of the flue gas heater 7 goes out
It also is provided with temperature sensor at mouthful, temperature sensor is by the thermal medium of the smoke outlet of the flue gas heater 7 detected
Temperature is sent to controller, and the temperature threshold of thermal medium is pre-set in controller, when the temperature received is less than setting
When temperature threshold, controller increases the aperture of thermal medium flow control valve, automatically controls the flue gas temperature for ensuring to be discharged into chimney 2
Degree reaches target call.
Above content is only the structure example and explanation to the utility model, the technologies of affiliated the art
Personnel make various modifications or additions to the described embodiments or substitute by a similar method, without departing from
The structure of utility model or beyond the scope defined by this claim, all should belong to the protection range of the utility model.
Claims (6)
1. a kind of denitrating flue gas desulfurization process system, which is characterized in that including passing through the sequentially connected denitrification apparatus of pipeline, desulfurization
Device and chimney, the denitrification apparatus is interior to be equipped with catalyst, is connected by pipeline between the denitrification apparatus and the desulfurizer
It is connected to gas cooler, flue gas heater is connected with by pipeline between the desulfurizer and the chimney；The denitration dress
It sets including flue gas-flue gas heat-exchange unit, flue gas-vapor heat exchanger and SCR denitration reactor, the flue gas-flue gas heat-exchange unit and institute
Gas cooler connection is stated, the flue gas-flue gas heat-exchange unit is connected to smoke inlet, the flue gas-vapor heat exchanger and the cigarette
In parallel with the SCR denitration reactor again, the exhanst gas outlet of the SCR denitration reactor and institute after gas-flue gas heat-exchange unit series connection
State flue gas-flue gas heat-exchange unit connection.
2. a kind of denitrating flue gas desulfurization process system according to claim 1, which is characterized in that the flue gas-flue gas changes
Hot device and flue gas-vapor heat exchanger are pipe heat exchanger.
3. a kind of denitrating flue gas desulfurization process system according to claim 2, which is characterized in that the flue gas-flue gas changes
The heat exchanger tube of hot device is inside and outside counterenamel pipe, and the heat exchanger tube of the flue gas-vapor heat exchanger is finned tube.
4. a kind of denitrating flue gas desulfurization process system according to claim 1, which is characterized in that the flue gas-flue gas changes
Hot device, SCR denitration reactor, flue gas heater, gas cooler, is equipped with soot blowing in desulfurizer at flue gas-vapor heat exchanger
Device.
5. a kind of denitrating flue gas desulfurization process system according to claim 2, which is characterized in that the flue gas-flue gas changes
The heat exchanger tube of hot device uses enamel pipe.
6. a kind of denitrating flue gas desulfurization process system according to claim 1, which is characterized in that the flue gas heater with
The heat exchanger tube of gas cooler is equipped with abrasionproof pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721536444.2U CN207745694U (en) | 2017-11-17 | 2017-11-17 | A kind of denitrating flue gas desulfurization process system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721536444.2U CN207745694U (en) | 2017-11-17 | 2017-11-17 | A kind of denitrating flue gas desulfurization process system |
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| CN207745694U true CN207745694U (en) | 2018-08-21 |
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| CN201721536444.2U Active CN207745694U (en) | 2017-11-17 | 2017-11-17 | A kind of denitrating flue gas desulfurization process system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111482083A (en) * | 2020-05-13 | 2020-08-04 | 江苏景南环保科技有限公司 | Dangerous waste incineration SCR (Selective catalytic reduction) equipment without external energy consumption |
-
2017
- 2017-11-17 CN CN201721536444.2U patent/CN207745694U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111482083A (en) * | 2020-05-13 | 2020-08-04 | 江苏景南环保科技有限公司 | Dangerous waste incineration SCR (Selective catalytic reduction) equipment without external energy consumption |
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