CN117989553A - Single-tower double-cycle waste heat recovery and desulfurization cooperative treatment system - Google Patents
Single-tower double-cycle waste heat recovery and desulfurization cooperative treatment system Download PDFInfo
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- CN117989553A CN117989553A CN202410252893.2A CN202410252893A CN117989553A CN 117989553 A CN117989553 A CN 117989553A CN 202410252893 A CN202410252893 A CN 202410252893A CN 117989553 A CN117989553 A CN 117989553A
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- flue gas
- desulfurization
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- 239000002918 waste heat Substances 0.000 title claims abstract description 100
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 96
- 230000023556 desulfurization Effects 0.000 title claims abstract description 96
- 238000011084 recovery Methods 0.000 title claims abstract description 68
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 129
- 239000003546 flue gas Substances 0.000 claims abstract description 129
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 100
- 239000002002 slurry Substances 0.000 claims abstract description 56
- 238000000034 method Methods 0.000 claims abstract description 31
- 239000007921 spray Substances 0.000 claims abstract description 27
- 230000005494 condensation Effects 0.000 claims abstract description 21
- 238000009833 condensation Methods 0.000 claims abstract description 21
- 238000005507 spraying Methods 0.000 claims abstract description 20
- 238000005192 partition Methods 0.000 claims abstract description 9
- 239000000945 filler Substances 0.000 claims description 16
- 239000000428 dust Substances 0.000 claims description 11
- 239000007789 gas Substances 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 7
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 claims description 6
- 229910001385 heavy metal Inorganic materials 0.000 claims description 3
- 150000003839 salts Chemical class 0.000 claims description 3
- 239000000779 smoke Substances 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 claims 1
- 239000013589 supplement Substances 0.000 claims 1
- 230000003009 desulfurizing effect Effects 0.000 abstract description 12
- 230000001502 supplementing effect Effects 0.000 abstract 1
- 230000009466 transformation Effects 0.000 abstract 1
- 239000002028 Biomass Substances 0.000 description 5
- 238000010276 construction Methods 0.000 description 4
- 239000000498 cooling water Substances 0.000 description 4
- 229920006395 saturated elastomer Polymers 0.000 description 4
- 238000007791 dehumidification Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 230000002087 whitening effect Effects 0.000 description 2
- 230000002745 absorbent Effects 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
- F23J15/04—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material using washing fluids
-
- 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur 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
- B01D53/80—Semi-solid phase processes, i.e. by using slurries
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/006—Layout of treatment plant
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
- F23J15/022—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2215/00—Preventing emissions
- F23J2215/10—Nitrogen; Compounds thereof
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2215/00—Preventing emissions
- F23J2215/20—Sulfur; Compounds thereof
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2215/00—Preventing emissions
- F23J2215/60—Heavy metals; Compounds thereof
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2219/00—Treatment devices
- F23J2219/40—Sorption with wet devices, e.g. scrubbers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2219/00—Treatment devices
- F23J2219/70—Condensing contaminants with coolers
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- Engineering & Computer Science (AREA)
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- Mechanical Engineering (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Sustainable Development (AREA)
- Life Sciences & Earth Sciences (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention provides a single-tower double-circulation waste heat recovery and desulfurization cooperative treatment system, which comprises a flue gas inlet (1), a desulfurization slurry internal circulation pump (2), a slurry water tank (3), a flue gas condensation water tank (4), a desulfurization spray layer (7), a waste heat recovery spray layer (11), a desulfurization slurry heat exchanger (19), a slurry circulation pump (20), a heat pump (23) and the like. The invention improves the desulfurizing tower for realizing the single desulfurizing function, realizes the partition waste heat recovery function on the premise of not influencing the desulfurizing effect, recovers the heat in the flue gas by using desulfurizing slurry and waste heat water respectively, increases the waste heat recovery amount, reduces the investment of the whole system, improves the economical efficiency of energy saving transformation, reduces the temperature of the waste heat recovery part by adopting a spraying mode, simultaneously cleans the flue gas, further improves the flue gas emission quality, and can be used as a desulfurizing system or other process systems for supplementing water after the generated flue gas condensate is treated, thereby playing the role of water saving.
Description
Technical Field
The invention relates to a single-tower double-cycle waste heat recovery and desulfurization cooperative treatment system, in particular to a waste heat utilization and flue gas treatment system for flue gas of a coal-fired boiler and flue gas of a biomass boiler.
Background
According to the existing environmental protection policy, the desulfurization requirements of flue gas after the existing coal-fired and biomass power plant boiler are continuously enhanced, and the desulfurization technology can be divided into a wet method, a dry method and a semi-dry (semi-wet) method according to the dry and wet states of the absorbent and the desulfurization products in the desulfurization process. No matter which method is used for desulfurizing, part of sensible heat exists in the flue gas and a large amount of latent heat of water vapor is not recovered.
If a spray tower is additionally arranged behind the desulfurization tower for waste heat recovery, the desulfurization tower and the spray tower have larger volumes, and the separated arrangement occupies a large area space, so that the investment cost of the whole system can be increased.
Disclosure of Invention
The invention relates to a single-tower double-cycle waste heat recovery and desulfurization cooperative treatment system, in particular to a waste heat utilization and flue gas treatment system for flue gas of a coal-fired boiler and flue gas of a biomass boiler, which aims to solve the defects in the prior art.
The desulfurization slurry internal circulation device comprises a flue gas inlet (1), a desulfurization slurry internal circulation pump (2), a slurry water tank (3), a flue gas condensation water tank (4), a partition plate (5), a turbulator (6), a desulfurization spray layer (7), a lift cap (8), a waste heat recovery plate type demister (9), a flue gas outlet (10), a waste heat recovery spray layer (11), a filler (12), a tubular demister (13), a desulfurization plate type demister (14), an internal circulation pipeline (15), a boiler (16), a denitration device (17), a dust remover (18), a desulfurization slurry heat exchanger (19), a slurry circulation pump (20), a process water pump (21), a waste heat water pump (22), a heat pump (23), a process water pump 2 (24), a heat pump drive (25), a chimney (26) and other components.
The method is characterized in that: after passing through a denitration device (17) and a dust remover (18), the flue gas generated by the boiler (16) enters a single-tower double-circulation desulfurization tower through a flue gas inlet (1) and is desulfurized with atomized liquid water sprayed from a desulfurization spray layer (7). After desulfurization, the flue gas continuously rises to pass through the desulfurization plate type demister (14) and the tubular demister (13) for first demisting, then enters the waste heat recovery part through the gas lifting cap (8), exchanges heat in the filler (12) and the waste heat recovery spraying layer (11), the temperature of the flue gas is further reduced, and finally, the flue gas is discharged from the flue gas outlet (10) and enters the chimney (26) through the flue to be discharged. Waste heat water is collected to the lift cap (8) through the waste heat recovery spraying layer (11) together with flue gas condensate water in a uniformly dispersed manner from the filler (12), finally flows to the flue gas condensation water tank (4) along a pipeline in the tower, and is led out from the bottom of the flue gas condensation water tank (4), is sent into the heat pump (23) through the waste heat water pump (22) to exchange heat, and returns to the waste heat recovery spraying layer (11) to circulate after being cooled. The desulfurization is additionally provided with an internal circulation reinforced desulfurization system, desulfurization slurry in the slurry pond (3) flows into the slurry pond (3) after being desulfurized through the desulfurization spray layer (7) through the internal circulation pump (2) and the internal circulation pipeline (15), slurry is led out from the bottom of the slurry pond (3), is sent into the desulfurization slurry heat exchanger (19) through the slurry circulation pump (20) for heat exchange, and returns to the desulfurization spray layer (7) for circulation after being cooled.
Further, the slurry of the desulfurizing tower and the condensed water of the flue gas are divided into two areas by the partition plate (5), and different heat exchangers are selected according to the characteristics of the medium, so that the differential utilization of the waste heat of the flue gas is realized.
Further, the desulfurizing tower and the waste heat recovery spray tower are combined into one tower, the tower is divided into an upper part and a lower part through the air lifting cap (8), the respective functions are respectively realized, the occupied space of equipment is reduced, and meanwhile, the equipment investment is reduced.
Furthermore, the device separates the high-temperature cooling water tank (5) from the low-temperature cooling water tank (8) by arranging the water tank partition plate (12), so that the additional water tank outside the heat exchanger is avoided, and the construction cost is reduced.
Further, by using the filler (12) to enhance the heat transfer of the flue gas in the waste heat recovery section, the device height can be reduced.
Further, by adding the waste heat recovery part, the deep recovery of the waste heat of the flue gas is realized, a large amount of condensed water generated by condensing water vapor in the flue gas enters the flue gas condensation water tank (4), the quality of the condensed water in the flue gas of the waste heat recovery part is good, and the condensed water can be used as water for the spraying part or other process water after simple treatment.
Further, sulfur dioxide, soluble salt, heavy metal, smoke dust and the like in the flue gas after desulfurization are dissolved in intermediate water to different degrees in the spraying process of the waste heat recovery part, so that the content of emission is further reduced.
The invention relates to a single-tower double-cycle waste heat recovery and desulfurization cooperative treatment system, in particular to a waste heat utilization and flue gas treatment system for flue gas of a coal-fired boiler and flue gas of a biomass boiler. Flue gas generated by the boiler (16) enters a desulfurization tower after passing through a denitration device (17) and a dust remover (18), flue gas desulfurization is carried out in the tower, flue gas heat exchange is carried out on the flue gas in the two parts, the first heat exchange is carried out on the flue gas and atomized liquid water sprayed from a desulfurization spray layer (7), heat is transferred to desulfurization slurry by the flue gas in the process, moisture in the desulfurization slurry is absorbed simultaneously, the temperature is reduced to the dew point temperature of vapor in the flue gas, the saturated wet flue gas continuously rises to be defogged through a desulfurization plate type demister (14) and a tubular demister (13), and then the flue gas enters a waste heat recovery part through a gas lifting cap (8). The temperature of the desulfurization slurry is increased after the heat in the flue gas is absorbed, the desulfurization slurry is collected in a slurry water tank (3), then the slurry is led out from the bottom, and is sent into a desulfurization slurry heat exchanger (19) for heat exchange through a slurry circulating pump (20), and the heat is transferred to process water, cooled and returned to a desulfurization spray layer (7) for desulfurization and heat exchange circulation.
The second heat exchange of the flue gas occurs in the waste heat recovery part, after the flue gas enters the waste heat recovery part from the gas lifting cap (8), the flue gas exchanges heat with waste heat water in the filler (12), most of heat in the flue gas is carried away by the waste heat water in the filler due to the effect of increasing the heat exchange area, and meanwhile, water vapor in the flue gas is in a saturated state when entering the waste heat recovery part, so that a great amount of latent heat released in the condensation process of the water vapor is taken away in the process besides the sensible heat of the reduced temperature of the flue gas; and then the flue gas exchanges heat with the waste heat water sprayed in the waste heat recovery spraying layer (11) to further reduce the temperature of the flue gas, and finally the flue gas is discharged from the flue gas outlet (10). After the waste heat water is subjected to heat exchange and temperature rise with the flue gas, the waste heat water is collected in a flue gas condensation water tank (4), the waste heat water is led out from the bottom of the flue gas condensation water tank (4), is sent into a heat pump (23) through a waste heat water pump (22), and is returned to a waste heat recovery spraying layer (11) for circulation after being transferred to the process water through the heat pump.
Through the effective combination of the desulfurization of the first part and the heat exchange of the two parts, the combination of the two functions is realized, the number of tower construction is reduced, the system investment is reduced, the operation cost is reduced, the concentration of pollutants in the flue gas is further reduced, and the deep condensation, dehumidification and whitening of the flue gas are realized.
Drawings
FIG. 1 is a flow chart of a single-tower double-cycle waste heat recovery and desulfurization cooperative treatment system.
FIG. 2 is a schematic view of the structure of the desulfurizing tower.
Detailed Description
The invention provides a single-tower double-circulation waste heat recovery and desulfurization cooperative treatment system which comprises a flue gas inlet (1), a desulfurization slurry internal circulation pump (2), a slurry water tank (3), a flue gas condensation water tank (4), a partition plate (5), a turbulator (6), a desulfurization spray layer (7), an air lift cap (8), a waste heat recovery plate type demister (9), a flue gas outlet (10), a waste heat recovery spray layer (11), a filler (12), a tubular demister (13), a desulfurization plate type demister (14), an internal circulation pipeline (15), a boiler (16), a denitration device (17), a dust remover (18), a desulfurization slurry heat exchanger (19), a slurry circulation pump (20), a process water pump 1 (21), a waste heat water pump (22), a heat pump (23), a process water pump 2 (24), a heat pump drive (25), a chimney (26) and other components.
The method is characterized in that: after passing through a denitration device (17) and a dust remover (18), the flue gas generated by the boiler (16) enters a single-tower double-circulation desulfurization tower through a flue gas inlet (1) and is desulfurized with atomized liquid water sprayed from a desulfurization spray layer (7). After desulfurization, the flue gas continuously rises to pass through the desulfurization plate type demister (14) and the tubular demister (13) for first demisting, then enters the waste heat recovery part through the gas lifting cap (8), exchanges heat in the filler (12) and the waste heat recovery spraying layer (11), the temperature of the flue gas is further reduced, and finally, the flue gas is discharged from the flue gas outlet (10) and enters the chimney (26) through the flue to be discharged. Waste heat water is collected to the lift cap (8) through the waste heat recovery spraying layer (11) together with flue gas condensate water in a uniformly dispersed manner from the filler (12), finally flows to the flue gas condensation water tank (4) along a pipeline in the tower, and is led out from the bottom of the flue gas condensation water tank (4), is sent into the heat pump (23) through the waste heat water pump (22) to exchange heat, and returns to the waste heat recovery spraying layer (11) to circulate after being cooled. The desulfurization is additionally provided with an internal circulation reinforced desulfurization system, desulfurization slurry in the slurry pond (3) flows into the slurry pond (3) after being desulfurized through the desulfurization spray layer (7) through the internal circulation pump (2) and the internal circulation pipeline (15), slurry is led out from the bottom of the slurry pond (3), is sent into the desulfurization slurry heat exchanger (19) through the slurry circulation pump (20) for heat exchange, and returns to the desulfurization spray layer (7) for circulation after being cooled.
Further, the slurry of the desulfurizing tower and the condensed water of the flue gas are divided into two areas by the partition plate (5), and different heat exchangers are selected according to the characteristics of the medium, so that the differential utilization of the waste heat of the flue gas is realized.
Further, the desulfurizing tower and the waste heat recovery spray tower are combined into one tower, the tower is divided into an upper part and a lower part through the air lifting cap (8), the respective functions are respectively realized, the occupied space of equipment is reduced, and meanwhile, the equipment investment is reduced.
Furthermore, the device separates the high-temperature cooling water tank (5) from the low-temperature cooling water tank (8) by arranging the water tank partition plate (12), so that the additional water tank outside the heat exchanger is avoided, and the construction cost is reduced.
Further, by using the filler (12) to enhance the heat transfer of the flue gas in the waste heat recovery section, the device height can be reduced.
Further, by adding the waste heat recovery part, the deep recovery of the waste heat of the flue gas is realized, a large amount of condensed water generated by condensing water vapor in the flue gas enters the flue gas condensation water tank (4), the quality of the condensed water in the flue gas of the waste heat recovery part is good, and the condensed water can be used as water for the spraying part or other process water after simple treatment.
Further, sulfur dioxide, soluble salt, heavy metal, smoke dust and the like in the flue gas after desulfurization are dissolved in intermediate water to different degrees in the spraying process of the waste heat recovery part, so that the content of emission is further reduced.
The invention relates to a single-tower double-cycle waste heat recovery and desulfurization cooperative treatment system, in particular to a waste heat utilization and flue gas treatment system for flue gas of a coal-fired boiler and flue gas of a biomass boiler. Flue gas that boiler (16) produced is through denitration device (17) and dust remover (18) after, get into the desulfurizing tower, carry out flue gas desulfurization in the tower, carry out two-part flue gas heat transfer simultaneously, first heat transfer takes place in desulfurization part, flue gas exchanges heat with the atomized liquid water droplet that sprays from desulfurization spray layer (7), in this process, flue gas gives desulfurization thick liquid with heat transfer, absorb the moisture in the desulfurization thick liquid simultaneously, and the dew point temperature of vapor in the cooling to the flue gas, as saturated wet flue gas continuously rise and carry out first defogging through desulfurization plate defroster (14), tubular defroster (13), later get into waste heat recovery part through rising gas cap (8). The temperature of the desulfurization slurry is increased after the heat in the flue gas is absorbed, the desulfurization slurry is collected in a slurry water tank (3), then the slurry is led out from the bottom, and is sent into a desulfurization slurry heat exchanger (19) for heat exchange through a slurry circulating pump (20), and the heat is transferred to process water, cooled and returned to a desulfurization spray layer (7) for desulfurization and heat exchange circulation.
The second heat exchange of the flue gas occurs in the waste heat recovery part, after the flue gas enters the waste heat recovery part from the gas lifting cap (8), the flue gas exchanges heat with waste heat water in the filler (12), most of heat in the flue gas is carried away by the waste heat water in the filler due to the effect of increasing the heat exchange area, and meanwhile, water vapor in the flue gas is in a saturated state when entering the waste heat recovery part, so that a great amount of latent heat released in the condensation process of the water vapor is taken away in the process besides the sensible heat of the reduced temperature of the flue gas; and then the flue gas exchanges heat with the waste heat water sprayed in the waste heat recovery spraying layer (11) to further reduce the temperature of the flue gas, and finally the flue gas is discharged from the flue gas outlet (10). After the waste heat water is subjected to heat exchange and temperature rise with the flue gas, the waste heat water is collected in a flue gas condensation water tank (4), the waste heat water is led out from the bottom of the flue gas condensation water tank (4), is sent into a heat pump (23) through a waste heat water pump (22), and is returned to a waste heat recovery spraying layer (11) for circulation after being transferred to the process water through the heat pump.
Through the effective combination of the desulfurization of the first part and the heat exchange of the two parts, the combination of the two functions is realized, the number of tower construction is reduced, the system investment is reduced, the operation cost is reduced, the concentration of pollutants in the flue gas is further reduced, and the deep condensation, dehumidification and whitening of the flue gas are realized.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (6)
1. The invention discloses a single-tower double-circulation waste heat recovery and desulfurization cooperative treatment system, which is commonly used for a boiler flue gas waste heat utilization system and comprises a flue gas inlet (1), a desulfurization slurry internal circulation pump (2), a slurry water tank (3), a flue gas condensation water tank (4), a partition plate (5), a turbulator (6), a desulfurization spray layer (7), an air lift cap (8), a waste heat recovery plate type demister (9), a flue gas outlet (10), a waste heat recovery spray layer (11), a filler (12), a tubular demister (13), a desulfurization plate type demister (14), an internal circulation pipeline (15), a boiler (16), a denitration device (17), a dust remover (18), a desulfurization slurry heat exchanger (19), a slurry circulation pump (20), a process water pump 1 (21), a waste heat water pump (22), a heat pump (23), a process water pump 2 (24), a heat pump drive (25), a chimney (26) and other components. The method is characterized in that: after passing through a denitration device (17) and a dust remover (18), the flue gas generated by the boiler (16) enters a single-tower double-circulation desulfurization tower through a flue gas inlet (1) and is desulfurized with atomized liquid water sprayed from a desulfurization spray layer (7). After desulfurization, the flue gas continuously rises to pass through the desulfurization plate type demister (14) and the tubular demister (13) for first demisting, then enters the waste heat recovery part through the gas lifting cap (8), exchanges heat in the filler (12) and the waste heat recovery spraying layer (11), the temperature of the flue gas is further reduced, and finally, the flue gas is discharged from the flue gas outlet (10) and enters the chimney (26) through the flue to be discharged. Waste heat water is collected to the lift cap (8) through the waste heat recovery spraying layer (11) together with flue gas condensate water in a uniformly dispersed manner from the filler (12), finally flows to the flue gas condensation water tank (4) along a pipeline in the tower, and is led out from the bottom of the flue gas condensation water tank (4), is sent into the heat pump (23) through the waste heat water pump (22) to exchange heat, and returns to the waste heat recovery spraying layer (11) to circulate after being cooled. The desulfurization is additionally provided with an internal circulation reinforced desulfurization system, desulfurization slurry in the slurry pond (3) flows into the slurry pond (3) after being desulfurized through the desulfurization spray layer (7) through the internal circulation pump (2) and the internal circulation pipeline (15), slurry is led out from the bottom of the slurry pond (3), is sent into the desulfurization slurry heat exchanger (19) through the slurry circulation pump (20) for heat exchange, and returns to the desulfurization spray layer (7) for circulation after being cooled.
2. The single-tower double-cycle waste heat recovery and desulfurization cooperative treatment system is characterized in that desulfurization tower slurry and flue gas condensate water are divided into two areas through a partition plate (5), and different heat exchangers are selected according to medium characteristics, so that the waste heat of the flue gas is utilized differently.
3. The single-tower double-cycle waste heat recovery and desulfurization cooperative treatment system according to claim 1 is characterized in that a desulfurization tower and a waste heat recovery spray tower are combined into a tower, and the tower is divided into an upper part and a lower part through an air lifting cap (8) to realize respective functions, thereby being beneficial to reducing the occupied space of equipment and reducing the equipment investment.
4. The seed single-tower double-cycle waste heat recovery and desulfurization cooperative treatment system according to claim 1 is characterized in that the heat exchange of the flue gas in the waste heat recovery part is enhanced by using a filler (12), so that the height of the device can be reduced.
5. The single-tower double-cycle waste heat recovery and desulfurization cooperative treatment system according to claim 1 is characterized in that the waste heat recovery part is added to realize deep recovery of waste heat of flue gas, a large amount of condensed water generated by condensing water vapor in the flue gas enters a flue gas condensation water tank (4), the quality of the condensed water in the flue gas in the waste heat recovery part is good, and the condensed water can be used as water supplement of a spraying part or other process water after simple treatment.
6. The seed single-tower double-cycle waste heat recovery and desulfurization cooperative treatment system according to claim 1, which is characterized in that sulfur dioxide, soluble salt, heavy metal, smoke dust and the like in the flue gas after desulfurization are dissolved in intermediate water to different degrees in the spraying process of the waste heat recovery part, so that the content of emission is further reduced.
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| CN202410252893.2A CN117989553A (en) | 2024-03-06 | 2024-03-06 | Single-tower double-cycle waste heat recovery and desulfurization cooperative treatment system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN118217781A (en) * | 2024-05-14 | 2024-06-21 | 北京青山绿野环保科技有限公司 | Desulfurization and waste heat recovery integrated absorption tower and absorption method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN118217781A (en) * | 2024-05-14 | 2024-06-21 | 北京青山绿野环保科技有限公司 | Desulfurization and waste heat recovery integrated absorption tower and absorption method thereof |
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