CN108380024B - Desulfurizing and dedusting integrated cylinder heating furnace system and desulfurizing and dedusting method thereof - Google Patents
Desulfurizing and dedusting integrated cylinder heating furnace system and desulfurizing and dedusting method thereof Download PDFInfo
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- CN108380024B CN108380024B CN201810332364.8A CN201810332364A CN108380024B CN 108380024 B CN108380024 B CN 108380024B CN 201810332364 A CN201810332364 A CN 201810332364A CN 108380024 B CN108380024 B CN 108380024B
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 51
- 230000003009 desulfurizing effect Effects 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims abstract description 20
- 230000002745 absorbent Effects 0.000 claims abstract description 123
- 239000002250 absorbent Substances 0.000 claims abstract description 123
- 239000002002 slurry Substances 0.000 claims abstract description 81
- 239000007789 gas Substances 0.000 claims abstract description 48
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 45
- 239000003546 flue gas Substances 0.000 claims abstract description 45
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 35
- 230000023556 desulfurization Effects 0.000 claims abstract description 35
- 239000000428 dust Substances 0.000 claims abstract description 23
- 238000005507 spraying Methods 0.000 claims abstract description 21
- 239000007788 liquid Substances 0.000 claims abstract description 18
- 230000005855 radiation Effects 0.000 claims abstract description 12
- 239000003595 mist Substances 0.000 claims abstract description 5
- 238000002485 combustion reaction Methods 0.000 claims description 13
- 239000011575 calcium Substances 0.000 claims description 10
- 238000003860 storage Methods 0.000 claims description 10
- 230000009471 action Effects 0.000 claims description 6
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- 238000004064 recycling Methods 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 230000005484 gravity Effects 0.000 claims description 3
- 239000008235 industrial water Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000002347 injection Methods 0.000 abstract description 9
- 239000007924 injection Substances 0.000 abstract description 9
- 230000007613 environmental effect Effects 0.000 abstract description 7
- 239000000571 coke Substances 0.000 description 12
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 10
- 230000008569 process Effects 0.000 description 7
- 239000000047 product Substances 0.000 description 5
- 238000004939 coking Methods 0.000 description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- 239000003245 coal Substances 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 229910052717 sulfur Inorganic materials 0.000 description 3
- 239000011593 sulfur Substances 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- UFWIBTONFRDIAS-UHFFFAOYSA-N Naphthalene Chemical compound C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 description 2
- 239000000295 fuel oil Substances 0.000 description 2
- LELOWRISYMNNSU-UHFFFAOYSA-N hydrogen cyanide Chemical compound N#C LELOWRISYMNNSU-UHFFFAOYSA-N 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002802 bituminous coal Substances 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 235000011116 calcium hydroxide Nutrition 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000012824 chemical production Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 239000010459 dolomite Substances 0.000 description 1
- 229910000514 dolomite Inorganic materials 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
- B01D53/75—Multi-step processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
- B01D47/06—Spray cleaning
-
- 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
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
- B01D53/502—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific solution or suspension
-
- 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
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/508—Sulfur oxides by treating the gases with solids
-
- 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
- B01D53/96—Regeneration, reactivation or recycling of reactants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2247/00—Details relating to the separation of dispersed particles from gases, air or vapours by liquid as separating agent
- B01D2247/04—Regenerating the washing fluid
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2247/00—Details relating to the separation of dispersed particles from gases, air or vapours by liquid as separating agent
- B01D2247/10—Means for removing the washing fluid dispersed in the gas or vapours
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/40—Alkaline earth metal or magnesium compounds
- B01D2251/404—Alkaline earth metal or magnesium compounds of calcium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/60—Inorganic bases or salts
- B01D2251/602—Oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/60—Inorganic bases or salts
- B01D2251/604—Hydroxides
-
- 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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention relates to a desulfurization and dust removal integrated cylinder heating furnace system and a desulfurization and dust removal method thereof, wherein a dry absorbent injection port is arranged at the upper part of a radiation section of the cylinder heating furnace and is connected with an absorbent injection system through a pipeline; the lower part of the chimney is a dust removal and desulfurization section, and the upper part is a pressurizing section; the bottom of the dedusting and desulfurizing section is provided with a liquid breaking disc, the upper part of the dedusting and desulfurizing section is provided with an absorbent slurry spraying device, the top of the dedusting and desulfurizing section is provided with a mist catching layer, and a chimney above the liquid breaking disc is provided with a circulating slurry outlet; the circulating slurry outlet and the absorbent slurry spraying device are respectively connected with the absorbent slurry circulating and conveying system; the bottom of the pressurizing section is provided with a shut-off valve, a tail gas outlet is arranged on a chimney below the shut-off valve, a pressurizing tail gas inlet is arranged on the chimney above the shut-off valve, and the tail gas outlet and the pressurizing tail gas inlet are respectively connected with a tail gas fan through pipelines. The invention integrates the dust removal and desulfurization functions by improving the structure of the cylindrical heating furnace, thereby ensuring that the discharge index of the treated flue gas meets the requirement of environmental protection standard.
Description
Technical Field
The invention relates to the technical field of cylinder heating furnaces, in particular to a desulfurization and dust removal integrated cylinder heating furnace system and a desulfurization and dust removal method thereof.
Background
A plurality of equipment units in the chemical production recovery and tar processing process in the metallurgical coking industry adopt cylindrical heating furnaces for providing heat required by the process for distillation towers, heat conduction oil, reaction raw materials or other mediums, and the cylindrical heating furnaces adopt fuel oil, purified coke oven gas, coal, natural gas and the like as fuels according to the existing conditions of each factory. Because the purified coke oven gas contains a certain amount of sulfur elements, sulfur dioxide is generated during combustion, and the flue gas containing the sulfur dioxide is directly discharged into the atmosphere through a chimney.
The coke oven gas is a combustible gas produced by preparing coking coal from several kinds of bituminous coal and producing coke and tar products after high-temperature carbonization in a coke oven, and is a byproduct of the coking industry. The purified coke oven gas is raw coke oven gas generated by coking, and the raw coke oven gas is purified by a gas purifying system to remove various impurities such as hydrogen sulfide, hydrogen cyanide, ammonia, tar, naphthalene and the like in the raw coke oven gas, so that the raw coke oven gas reaches national or industrial standards and is supplied to industrial or civil users.
Because of the existing purification process or other reasons of the purified coke oven gas, the sulfur-containing index of the flue gas after the combustion of the purified coke oven gas can not meet the requirement of environmental protection standards, wherein the technology of the old gas purification system is relatively backward, and the sulfur-containing index of the flue gas is seriously beyond the limit value of the environmental protection standards. The heating furnace using fuel oil and coal as fuel can not meet the environmental protection standard because of insufficient desulfurization measures in the prior art.
In recent years, air pollution is more and more serious, with the national 'twelve and five' planning and development, the national environmental protection policy and requirements are more and more strict, and in the atmosphere, sulfur dioxide is a source of acid rain and one of main pollutants in the atmosphere. In order to meet the increasingly strict national emission standard, the method for reducing the concentration of sulfur dioxide in the flue gas of the cylindrical heating furnace to achieve the standard emission is discussed and has important significance.
Disclosure of Invention
The invention provides a desulfurization and dust removal integrated cylinder heating furnace system and a desulfurization and dust removal method thereof, which are used for improving the structure of a cylinder heating furnace to integrate dust removal and desulfurization functions, thereby ensuring that the discharge index of treated flue gas meets the requirement of environmental protection standards.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
the desulfurization and dust removal integrated cylinder heating furnace system comprises a cylinder heating furnace, wherein a combustion chamber is arranged at the bottom of the cylinder heating furnace, a hearth above the combustion chamber is divided into a radiation section and a convection section on the next side, and a chimney is arranged at the top of the cylinder heating furnace; the upper part of the radiation section is provided with a dry absorbent injection port which is connected with an absorbent injection system through a pipeline; the lower part of the chimney is a dedusting and desulfurizing section, and the upper part of the chimney is a pressurizing section; wherein the bottom of the dedusting and desulfurizing section is provided with a liquid breaking disc, the upper part is provided with an absorbent slurry spraying device, the top is provided with a mist catching layer, and a chimney above the liquid breaking disc is provided with a circulating slurry outlet; the circulating slurry outlet and the absorbent slurry spraying device are respectively connected with the absorbent slurry circulating and conveying system; the bottom of the pressurizing section is provided with a shut-off valve, a tail gas outlet is arranged on a chimney below the shut-off valve, a pressurizing tail gas inlet is arranged on the chimney above the shut-off valve, the tail gas outlet is connected with the inlet end of a tail gas fan through a pipeline, and the outlet end of the tail gas fan is connected with the pressurizing tail gas inlet through a pipeline; the bottom of the cylindrical heating furnace is provided with a cone section which is narrowed downwards, and the middle part of the cone section is provided with an absorbent discharge port.
The absorbent spraying system consists of a finished absorbent storage bin, a distributor and an absorbent spraying-assisting fan, wherein a discharge hole of the finished absorbent storage bin and an air outlet of the absorbent spraying-assisting fan are respectively connected with an inlet of the distributor, and an outlet of the distributor is connected with a dry absorbent spraying-in hole on the cylindrical heating furnace.
The absorbent slurry circulating and conveying system comprises an absorbent slurry middle tank, an absorbent slurry pump and an absorbent slurry cooler which are sequentially connected through pipelines, wherein an industrial water inlet and a circulating slurry inlet are formed in the absorbent slurry middle tank, and the circulating slurry inlet is connected with a circulating slurry outlet formed in a chimney above the liquid breaking disc through a pipeline; the absorbent slurry cooler is connected with the absorbent slurry spraying device through a pipeline.
A desulfurization and dust removal method of a desulfurization and dust removal integrated cylinder heating furnace system comprises the following steps:
1) The finished product dry absorbent stored in the finished product absorbent storage bin enters the distributor through the discharge port and is mixed with the wind of the absorbent auxiliary air-jetting machine, and then is jetted into the radiation section of the cylindrical heating furnace through the dry absorbent jetting port; under the action of high-temperature air flow in the hearth, the dry absorbent is decomposed to generate CaO, and the CaO and SO are in an aerobic environment 2 React to form calcium sulfate, thereby removing a part of SO 2 The method comprises the steps of carrying out a first treatment on the surface of the Unreacted small-particle dry absorbent continuously flows upwards along with the flue gas through the convection section, large-particle dry absorbent falls to the bottom of the cylindrical heating furnace under the action of gravity, and self-absorbentThe exhaust port is discharged and is collected manually for recycling;
2) The flue gas after primary desulfurization enters a dedusting and desulfurizing section from a gas channel in the middle of a liquid breaking disc, reversely contacts with absorbent slurry sprayed on the upper part, and reacts with water to produce Ca (OH) with higher activity after CaO in the flue gas is humidified 2 The absorbent slurry itself contains Ca (OH) with high activity 2 ，Ca(OH) 2 With SO 2 Reaction to produce CaSO 3 Wherein a portion is oxidized to CaSO 4 At the same time, the absorbent slurry can also trap particulate matters in the flue gas;
the absorbent slurry reacted with the flue gas is collected by a liquid breaking disc, automatically flows into an absorbent slurry middle tank, is pressurized by an absorbent slurry pump, is cooled by an absorbent slurry cooler, and then returns to the top of the dedusting and desulfurizing section to be sprayed again, so that the recycling is realized;
3) Spraying the absorbent slurry to the flue gas subjected to secondary desulfurization to obtain fog drops, and capturing the fog drops in the flue gas through a fog capturing layer; when the flue gas enters the pressurizing section, the pressure of the flue gas generated by the combustion of the cylindrical heating furnace is insufficient to enable the flue gas to be normally discharged from the chimney, so that the pressure of the flue gas is increased by the suction force generated by the tail gas fan in the pressurizing section, and the pressurized flue gas returns to the chimney and finally is discharged into the atmosphere.
Compared with the prior art, the invention has the beneficial effects that:
1) The structure of the cylindrical heating furnace is improved, so that the cylindrical heating furnace integrates the functions of dust removal and desulfurization, and the discharge index of the treated flue gas is ensured to meet the requirement of environmental protection standards;
2) The cylindrical heating furnace has reasonable structure improvement, adopts an integrated structure, only needs to arrange auxiliary process equipment, does not need to arrange a conventional desulfurization and dust removal system, and saves the occupied area and the investment of process equipment;
3) The process flow is simple, the operation is convenient, the occupied area is small, and the energy is saved and the environment is protected.
Drawings
FIG. 1 is a schematic diagram of a desulfurizing and dedusting integrated cylindrical heating furnace system.
In the figure: 1. the system comprises a cylindrical heating furnace 11, a radiation section 111, a dry absorbent injection port 12, a convection section 13, a dedusting and desulfurization section 131, a liquid breaking disk 132, an absorbent slurry spraying device 133, a mist catching layer 14, a pressurization section 141, a shut-off valve 2, a combustion fan 3, a finished absorbent storage bin 4, an absorbent jet fan 5, a distributor 6, an absorbent slurry intermediate tank 7, an absorbent slurry pump 8, an absorbent slurry cooler 9, and an exhaust fan
Detailed Description
The following is a further description of embodiments of the invention, taken in conjunction with the accompanying drawings:
as shown in FIG. 1, the desulfurization and dust removal integrated cylinder heating furnace system comprises a cylinder heating furnace 1, wherein a combustion chamber is arranged at the bottom of the cylinder heating furnace 1, a hearth above the combustion chamber is divided into a radiation section 11 and a convection section 12 in the next-up mode, and a chimney is arranged at the top of the cylinder heating furnace 1; the upper part of the radiation section 11 is provided with a dry absorbent injection port 111, and the dry absorbent injection port 111 is connected with an absorbent injection system through a pipeline; the lower part of the chimney is a dedusting and desulfurizing section 13, and the upper part is a pressurizing section 14; wherein the bottom of the dedusting and desulfurizing section 13 is provided with a liquid breaking disc 131, the upper part is provided with an absorbent slurry spraying device 132, the top is provided with a mist catching layer 133, and a circulating slurry outlet is arranged on a chimney above the liquid breaking disc 131; the circulating slurry outlet and the absorbent slurry spraying device 132 are respectively connected with an absorbent slurry circulating and conveying system; the bottom of the pressurizing section 14 is provided with a stop valve 141, a tail gas outlet is arranged on a chimney below the stop valve 141, a pressurizing tail gas inlet is arranged on the chimney above the stop valve 141, the tail gas outlet is connected with the inlet end of the tail gas fan 9 through a pipeline, and the outlet end of the tail gas fan 9 is connected with the pressurizing tail gas inlet through a pipeline; the bottom of the cylindrical heating furnace 1 is provided with a cone section which is narrowed downwards, and the middle part of the cone section is provided with an absorbent discharge port.
The absorbent spraying system consists of a finished absorbent storage bin 3, a distributor 5 and an absorbent spraying-assisting fan 4, wherein a discharge hole of the finished absorbent storage bin 3 and an air outlet of the absorbent spraying-assisting fan 4 are respectively connected with an inlet of the distributor 5, and an outlet of the distributor 5 is connected with a dry absorbent spraying-in hole 111 on the cylindrical heating furnace 1.
The absorbent slurry circulating and conveying system comprises an absorbent slurry middle tank 6, an absorbent slurry pump 7 and an absorbent slurry cooler 8 which are sequentially connected through pipelines, wherein an industrial water inlet and a circulating slurry inlet are formed in the absorbent slurry middle tank 6, and the circulating slurry inlet is connected with a circulating slurry outlet formed in a chimney above a liquid breaking disc 131 through a pipeline; the absorbent slurry cooler 8 is connected to the absorbent slurry spraying device 132 by a pipe.
A desulfurization and dust removal method of a desulfurization and dust removal integrated cylinder heating furnace system comprises the following steps:
1) The finished product dry absorbent stored in the finished product absorbent storage bin 3 enters the distributor 5 through the discharge port, is mixed with the wind of the absorbent auxiliary air-jetting machine 4, and is jetted into the radiation section 11 of the cylindrical heating furnace 1 through the dry absorbent jetting port 111; under the action of high-temperature air flow in the hearth, the dry absorbent is decomposed to generate CaO, and the CaO and SO are in an aerobic environment 2 React to form calcium sulfate, thereby removing a part of SO 2 The method comprises the steps of carrying out a first treatment on the surface of the The unreacted small-particle dry absorbent continuously flows upwards along with the flue gas through the convection section 12, the large-particle dry absorbent falls to the bottom of the cylindrical heating furnace 1 under the action of gravity, is discharged from an absorbent discharge port and is collected manually for recycling;
2) The flue gas after primary desulfurization enters a dedusting and desulfurizing section 13 from a gas channel in the middle of a liquid breaking disc 131, contacts with absorbent slurry sprayed on the upper part reversely, and reacts with water to produce Ca (OH) with higher activity after CaO in the flue gas is humidified 2 The absorbent slurry itself contains Ca (OH) with high activity 2 ，Ca(OH) 2 With SO 2 Reaction to produce CaSO 3 Wherein a portion is oxidized to CaSO 4 At the same time, the absorbent slurry can also trap particulate matters in the flue gas;
the absorbent slurry reacted with the flue gas is collected by a liquid breaking disc 131, automatically flows into an absorbent slurry middle tank 6, is pressurized by an absorbent slurry pump 7, is cooled by an absorbent slurry cooler 8, and returns to the top of a dedusting and desulfurizing section 13 to be sprayed again, so that recycling is realized;
3) The smoke after secondary desulfurization is sprayed with the absorbent slurry and contains fog drops, and the fog drops in the smoke are captured through a fog capturing layer 133; when the flue gas enters the pressurizing section 14, the pressure of the flue gas generated by the combustion of the cylindrical heating furnace 1 is insufficient to enable the flue gas to be normally discharged from the chimney, so that the pressure of the flue gas is increased in the pressurizing section 14 through the suction force generated by the tail gas fan 9, and the pressurized flue gas returns to the chimney and finally is discharged into the atmosphere.
The invention improves on the basis of the traditional cylinder heating furnace structure, adopts the in-furnace calcium spraying desulfurization process, and adds a dry absorbent injection port 111 at the top of the radiation section 11, namely, the dry absorbent is directly sprayed into the airflow of a hearth for primary desulfurization; the chimney in the traditional cylindrical heating furnace is only used as an exhaust passage, and the invention divides the chimney into two functional sections, namely a dust removal desulfurization section 13 and a pressurization section 14. A wet desulfurization process is adopted in the dedusting and desulfurization section 13, namely, secondary desulfurization is realized by absorbing sulfur dioxide in the flue gas by spraying absorbent slurry; meanwhile, the absorbent slurry can also trap particulate matters in the flue gas, thereby achieving the purpose of dust removal.
The main component of the dry absorbent and absorbent slurry is CaO, and the raw materials can be limestone, slaked lime or dolomite.
After the structure is improved, the pressure of the flue gas generated by the fuel combustion in the cylindrical heating furnace 1 is insufficient to enable the flue gas to be normally discharged from a chimney, so that a pressurizing section 14 is arranged behind a dedusting and desulfurizing section 13, the tail gas after dedusting and desulfurizing is pressurized by a tail gas fan 9 and then returns to the chimney again, and finally is discharged into the atmosphere; the shut-off valve 141 is additionally arranged in the chimney between the tail gas outlet and the pressurized tail gas inlet of the tail gas blower 9, so that the change of the tail gas flow direction can be realized, and the maintenance is convenient.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (1)
1. The desulfurization and dust removal method of the desulfurization and dust removal integrated cylinder heating furnace system comprises a cylinder heating furnace, wherein a combustion chamber is arranged at the bottom of the cylinder heating furnace, a hearth above the combustion chamber is divided into a radiation section and a convection section from top to bottom, and a chimney is arranged at the top of the cylinder heating furnace; the device is characterized in that the upper part of the radiation section is provided with a dry absorbent spraying port which is connected with an absorbent spraying system through a pipeline; the lower part of the chimney is a dedusting and desulfurizing section, and the upper part of the chimney is a pressurizing section; wherein the bottom of the dedusting and desulfurizing section is provided with a liquid breaking disc, the upper part is provided with an absorbent slurry spraying device, the top is provided with a mist catching layer, and a chimney above the liquid breaking disc is provided with a circulating slurry outlet; the circulating slurry outlet and the absorbent slurry spraying device are respectively connected with the absorbent slurry circulating and conveying system; the bottom of the pressurizing section is provided with a shut-off valve, a tail gas outlet is arranged on a chimney below the shut-off valve, a pressurizing tail gas inlet is arranged on the chimney above the shut-off valve, the tail gas outlet is connected with the inlet end of a tail gas fan through a pipeline, and the outlet end of the tail gas fan is connected with the pressurizing tail gas inlet through a pipeline; the bottom of the cylindrical heating furnace is provided with a cone section which is narrowed downwards, and the middle part of the cone section is provided with an absorbent discharge port; the absorbent spraying system consists of a finished absorbent storage bin, a distributor and an absorbent spraying-assisting fan, wherein a discharge hole of the finished absorbent storage bin and an air outlet of the absorbent spraying-assisting fan are respectively connected with an inlet of the distributor, and an outlet of the distributor is connected with a dry absorbent spraying-in hole on the cylindrical heating furnace; the absorbent slurry circulating and conveying system comprises an absorbent slurry middle tank, an absorbent slurry pump and an absorbent slurry cooler which are sequentially connected through pipelines, wherein an industrial water inlet and a circulating slurry inlet are formed in the absorbent slurry middle tank, and the circulating slurry inlet is connected with a circulating slurry outlet formed in a chimney above the liquid breaking disc through a pipeline; the absorbent slurry cooler is connected with the absorbent slurry spraying device through a pipeline;
the desulfurization and dust removal method of the desulfurization and dust removal integrated cylinder heating furnace system comprises the following steps:
1) The finished product dry absorbent stored in the finished product absorbent storage bin enters the distributor through the discharge port and is mixed with the wind of the absorbent auxiliary air-jetting machine, and then is jetted into the radiation section of the cylindrical heating furnace through the dry absorbent jetting port; under the action of high-temperature air flow in the hearth, the dry absorbent is decomposed to generate CaO, and the CaO and SO are in an aerobic environment 2 React to form calcium sulfate, thereby removing a part of SO 2 The method comprises the steps of carrying out a first treatment on the surface of the Unreacted small particle dry absorbent heelThe large-particle dry absorbent falls to the bottom of the cylindrical heating furnace under the action of gravity along with the upward flow of the flue gas through the convection section, is discharged from an absorbent discharge port and is collected manually for recycling;
2) The flue gas after primary desulfurization enters a dedusting and desulfurizing section from a gas channel in the middle of a liquid breaking disc, reversely contacts with absorbent slurry sprayed on the upper part, and reacts with water to produce Ca (OH) with higher activity after CaO in the flue gas is humidified 2 The absorbent slurry itself contains Ca (OH) with high activity 2 ，Ca(OH) 2 With SO 2 Reaction to produce CaSO 3 Wherein a portion is oxidized to CaSO 4 At the same time, the absorbent slurry can also trap particulate matters in the flue gas;
the absorbent slurry reacted with the flue gas is collected by a liquid breaking disc, automatically flows into an absorbent slurry middle tank, is pressurized by an absorbent slurry pump, is cooled by an absorbent slurry cooler, and then returns to the top of the dedusting and desulfurizing section to be sprayed again, so that the recycling is realized;
3) Spraying the absorbent slurry to the flue gas subjected to secondary desulfurization to obtain fog drops, and capturing the fog drops in the flue gas through a fog capturing layer; when the flue gas enters the pressurizing section, the pressure of the flue gas generated by the combustion of the cylindrical heating furnace is insufficient to enable the flue gas to be normally discharged from the chimney, so that the pressure of the flue gas is increased by the suction force generated by the tail gas fan in the pressurizing section, and the pressurized flue gas returns to the chimney and finally is discharged into the atmosphere.
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| CN201810332364.8A CN108380024B (en) | 2018-04-13 | 2018-04-13 | Desulfurizing and dedusting integrated cylinder heating furnace system and desulfurizing and dedusting method thereof |
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| CN201810332364.8A CN108380024B (en) | 2018-04-13 | 2018-04-13 | Desulfurizing and dedusting integrated cylinder heating furnace system and desulfurizing and dedusting method thereof |
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| CN108380024B true CN108380024B (en) | 2024-01-09 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109373313B (en) * | 2018-12-03 | 2024-03-22 | 北京京诚泽宇能源环保工程技术有限公司 | Purification and recovery integrated heating furnace system |
| CN109432985A (en) * | 2018-12-20 | 2019-03-08 | 中冶焦耐(大连)工程技术有限公司 | A kind of desulphurizing and dust-removing integral cylindric heater |
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