CN109395539B - Device for removing white by spraying - Google Patents
Device for removing white by spraying Download PDFInfo
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- CN109395539B CN109395539B CN201811459612.1A CN201811459612A CN109395539B CN 109395539 B CN109395539 B CN 109395539B CN 201811459612 A CN201811459612 A CN 201811459612A CN 109395539 B CN109395539 B CN 109395539B
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- heat exchanger
- heat
- flue gas
- water
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- 238000005507 spraying Methods 0.000 title claims abstract description 61
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 138
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 93
- 239000003546 flue gas Substances 0.000 claims abstract description 93
- 238000010438 heat treatment Methods 0.000 claims abstract description 38
- 239000007921 spray Substances 0.000 claims abstract description 30
- 230000002087 whitening effect Effects 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 16
- 230000008569 process Effects 0.000 claims abstract description 13
- 238000010521 absorption reaction Methods 0.000 claims description 128
- 239000007788 liquid Substances 0.000 claims description 85
- 238000003860 storage Methods 0.000 claims description 30
- 230000008929 regeneration Effects 0.000 claims description 25
- 238000011069 regeneration method Methods 0.000 claims description 25
- 238000001914 filtration Methods 0.000 claims description 19
- 230000003009 desulfurizing effect Effects 0.000 claims description 18
- 238000009833 condensation Methods 0.000 claims description 17
- 239000000428 dust Substances 0.000 claims description 16
- 230000003750 conditioning effect Effects 0.000 claims description 14
- 239000000498 cooling water Substances 0.000 claims description 10
- 238000006477 desulfuration reaction Methods 0.000 claims description 9
- 230000023556 desulfurization Effects 0.000 claims description 9
- 230000001502 supplementing effect Effects 0.000 claims description 5
- 239000012530 fluid Substances 0.000 claims description 4
- 238000005057 refrigeration Methods 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- 238000011144 upstream manufacturing Methods 0.000 claims description 4
- 239000000110 cooling liquid Substances 0.000 claims description 2
- 239000000243 solution Substances 0.000 abstract description 72
- 230000000694 effects Effects 0.000 abstract description 11
- 229920006395 saturated elastomer Polymers 0.000 abstract description 11
- 239000012266 salt solution Substances 0.000 abstract description 9
- 230000008859 change Effects 0.000 abstract description 5
- 238000001816 cooling Methods 0.000 description 28
- 239000000779 smoke Substances 0.000 description 23
- 230000005494 condensation Effects 0.000 description 12
- 238000005399 mechanical ventilation Methods 0.000 description 12
- 239000010410 layer Substances 0.000 description 7
- 230000009467 reduction Effects 0.000 description 4
- 238000005496 tempering Methods 0.000 description 4
- 239000002918 waste heat Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000004134 energy conservation Methods 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 3
- 238000011049 filling Methods 0.000 description 3
- 239000003507 refrigerant Substances 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 238000011010 flushing procedure Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 230000009194 climbing Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- MXWHMTNPTTVWDM-NXOFHUPFSA-N mitoguazone Chemical compound NC(N)=N\N=C(/C)\C=N\N=C(N)N MXWHMTNPTTVWDM-NXOFHUPFSA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000002351 wastewater Substances 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
- B01D53/14—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
- B01D53/14—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
- B01D53/1431—Pretreatment by other processes
-
- 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
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
-
- 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
- F23J15/08—Arrangements of devices for treating smoke or fumes of heaters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/80—Water
-
- 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
-
- 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
Abstract
The application discloses a spray whitening device. The device is provided with at least one stage of second circulation loop, a refrigerating device and at least one stage of second heat exchanger, flue gas enters from the bottom of the absorbing device and is in countercurrent contact with concentrated solution or clear water sprayed from the top of the absorbing device, when in a heating season, the concentrated solution absorbs water in the flue gas to be thin, latent heat is released in the water phase change process, the flue gas and salt solution are heated, the heated solution exchanges heat through the second heat exchanger or the refrigerating device on the second circulation loop, and the balance state in the absorbing device is flexibly controlled by utilizing the heat taken away; in the non-heating season, besides the concentrated solution, clear water can be used for spraying to cool the flue gas, and the saturated clean flue gas is cooled and separated, so that the water lifting effect is achieved, and the heated water can be recycled after heat exchange by the second heat exchanger or the refrigerating device. Finally, the sensible heat of the raw flue gas and the latent heat of the water vapor of the clean flue gas are deeply recovered and utilized by the means.
Description
Technical Field
The application belongs to the technical field of environmental protection, and particularly relates to a spray whitening device.
Background
With the development of economy in China, the method is used for actively responding to the technical requirements (trial) of gypsum rain and colored smoke plume test of a coal-fired power plant in Shanghai city, the emission standard of atmospheric pollutants of a coal-fired power plant in Zhejiang (solicited manuscript), the notification of the work related to further strengthening the deep treatment of atmospheric pollution in important industries such as thermal power and steel in China in Tianjin city and the specification of colored smoke plume elimination in the areas such as Tangshan, zhangjia and the like in Hebei. Various technical routes for recovering the flue gas waste heat are developed, and common technical routes are that a flue gas condenser and a spray tower are arranged behind a desulfurizing tower or a slurry cooler is added on a slurry circulating slurry pipe to cool flue gas at an outlet of the desulfurizing tower to separate out water, and then the MGGH system is used for heating dehydrated clean flue gas by using the original flue gas waste heat.
The sensible heat of the raw flue gas and a large amount of latent heat of water vapor in the clean flue gas cannot be deeply utilized by the flue gas condensation or flue gas condensation regeneration technical route. Meanwhile, in order to cool and dehydrate the flue gas, the technology needs to take away the condensation latent heat of the flue gas by using an external refrigerant, and then heats the clean flue gas by using the sensible heat of the original flue gas to improve the unsaturation degree and climbing capacity, so that the mode causes great waste of energy. Meanwhile, the flue gas is condensed to release latent heat, a large amount of cooling circulating water is needed for taking away the latent heat, the cold source is a problem which needs to be faced by each technical route at present, particularly, for the region which prescribes the temperature and moisture content of flue gas at the outlet of a desulfurizing tower, the flue gas is required to be condensed in winter, even in summer, the cooling tower of a power plant is often operated at full load in summer, an effective cold source cannot be provided, if the cooling tower is newly built, tens of millions of investment is needed, and meanwhile, the water of the cooling tower is evaporated to be replaced by waste water in the flue gas, so that the water-saving effect cannot be achieved. If a mechanical ventilation cooling tower is newly built, the construction cost is extremely high, and the mechanical ventilation cooling tower cannot bear a power plant.
Disclosure of Invention
Therefore, the technical problem to be solved by the application is that the existing technical route for recovering the waste heat of the flue gas has the defects that the sensible heat of the original flue gas and a great amount of latent heat of water vapor in the clean flue gas cannot be deeply utilized, meanwhile, the energy and water resources are wasted, the investment cost is high, and the colored smoke plume is only invested and has no benefit, so that the spray whitening device is provided.
Therefore, the application adopts the technical proposal that,
a spray whitening device, which comprises an absorption device and also comprises,
at least one stage of second circulation loop, the liquid inlet end of the second circulation loop is communicated with the lower part of the absorption device, the liquid outlet end is communicated with the upper part of the absorption device, so that the liquid at the liquid outlet end enters the absorption device and is in countercurrent contact with the flue gas entering the absorption device;
and the liquid outlet end of the refrigerating device is communicated with the downstream second circulation loop so as to send the refrigerated liquid into the absorbing device.
The at least one stage of second heat exchanger is arranged on the second circulation loop and is positioned between the liquid inlet end and the liquid outlet end of the refrigerating device and the connection points of the second circulation loop respectively.
Further, the liquid outlet end of the refrigerating device is communicated with the second heat exchanger so as to exchange heat between circulating cooling water and liquid from the lower part of the absorbing device in the second heat exchanger.
Further, the device also comprises a first circulation loop, wherein the liquid inlet end of the first circulation loop is communicated with the lower part of the absorption device, and the liquid outlet end of the first circulation loop is communicated with the upper part of the absorption device;
the first spraying unit is arranged in the absorption device and is close to the upper part of the absorption device, and the first spraying unit is communicated with the liquid outlet end of the first circulation loop;
and the second spraying unit is arranged in the absorption device and is close to the upper part of the absorption device, and the second spraying unit is communicated with the liquid outlet end of the second circulation loop.
Further, the system also comprises a water storage device which is communicated with the second circulation loop, and the connection point of the water storage device and the second circulation loop is close to the lower part of the absorption device, so that water in the water storage device is sent into the absorption device for circulating spraying of flue gas in a non-heating season; in heating season, storing the water in the absorption device in the water storage device;
the liquid storage device is communicated with the first circulation loop, and the connection point of the liquid storage device and the first circulation loop is close to the lower part of the absorption device so as to store absorption liquid in the absorption device in the liquid storage device in a non-heating season; and in a heating season, sending the absorption liquid in the liquid storage device into the absorption device.
Further, a regeneration system is provided on the first circulation loop, the regeneration system comprising,
the flash tank is provided with a dilute solution inlet at the middle part, a steam outlet at the upper part and a concentrated solution outlet at the lower part;
the lower part of the absorption device, the sixth heat exchanger and the dilute solution inlet are sequentially communicated;
the steam outlet, the compressor, the saturator and the sixth heat exchanger are sequentially communicated, so that the dilute solution at the lower part of the absorption device and the secondary steam exchange heat in the sixth heat exchanger in a heating season and then enter the flash tank.
Further, the device also comprises a fifth heat exchanger which is arranged on the first circulation loop, wherein the lower part of the absorption device, the fifth heat exchanger, the sixth heat exchanger and the dilute solution inlet are sequentially communicated, so that heat exchange is carried out between the fifth heat exchanger and the concentrated solution from the concentrated solution outlet of the flash tank, and the heat exchange is carried out through the sixth heat exchanger, and then the heat exchange is finally carried out to the flash tank.
The device comprises an absorption device, a first heat exchanger, a second spray unit, a solution filtering tempering system, a second spray unit, a first spray unit, a second spray unit and a second spray unit, wherein the lower part of the absorption device, the solution filtering tempering system, the second heat exchanger and the second spray unit are sequentially communicated, so that dilute solution is fed into the second spray unit after being subjected to filtering tempering and heat exchange;
the flue gas desulfurization device comprises a dust removing device and a desulfurizing device which are sequentially communicated, wherein the desulfurizing device is communicated with an absorbing device, so that the flue gas sequentially passes through the dust removing device and the desulfurizing device and then enters the absorbing device.
Further, the heat exchange system also comprises a third heat exchanger and a fourth heat exchanger, wherein the second heat exchanger, the third heat exchanger and the fourth heat exchanger are sequentially communicated, so that the heat supply network incoming water or low-condensation water sequentially passes through the second heat exchanger, the third heat exchanger and the fourth heat exchanger and exchanges heat with substances entering the corresponding heat exchangers;
the sixth heat exchanger is communicated with the third heat exchanger and/or the fourth heat exchanger, so that the air-extracted condensed water of the sixth heat exchanger is fed into the third heat exchanger and/or the fourth heat exchanger for heat exchange, then fed into the boiler for water supply, and the secondary steam condensed water of the sixth heat exchanger is fed into the fourth heat exchanger and/or the third heat exchanger for heat exchange and then used as process supplementing water;
the steam outlet is also communicated with the fourth heat exchanger so as to send the secondary steam into the fourth heat exchanger for heat exchange.
Further, the flue gas desulfurization device further comprises an economizer, the economizer is arranged between the dust removing device and the desulfurization device or between the air preheater and the dust removing device, the fourth heat exchanger is communicated with the economizer so as to exchange heat between heat supply network incoming water or low condensation water and flue gas from the dust removing device in the economizer, and the flue gas after heat exchange is sent into the desulfurization device.
Further, a smoke inlet is formed in the lower portion of the absorption device, a smoke outlet is formed in the upper portion of the absorption device, the smoke outlet is communicated with a chimney, and the first spraying unit and the second spraying unit are located between the smoke inlet and the smoke outlet;
the demister is arranged in the absorption device and is positioned between the first spraying unit and the flue gas outlet.
Further, a first pump is arranged between the lower part of the absorption device and the second heat exchanger or between the second heat exchanger and the second spraying unit;
a second pump is arranged between the lower part of the absorption device and the solution filtering and conditioning system, or between the solution filtering and conditioning system and the second heat exchanger, or between the second heat exchanger and the second spraying unit;
a third pump is arranged between the lower part of the absorption device and the fifth heat exchanger, or between the fifth heat exchanger and the sixth heat exchanger, or between the sixth heat exchanger and the flash tank;
a fourth pump is arranged between the concentrated solution outlet and the fifth heat exchanger or between the fifth heat exchanger and the first spraying unit;
and a sixth pump connected with the liquid outlet end of the refrigerating device and the second circulation loop is arranged between the liquid outlet end of the refrigerating device and the second circulation loop.
The application also discloses a method for removing white smoke by spraying the absorbing liquid and/or the clean water.
The technical scheme of the application has the following advantages:
1. the spray whitening device provided by the application is provided with at least one stage of second circulation loop and a refrigerating device, wherein the liquid inlet end of the refrigerating device is communicated with the upstream second circulation loop in the fluid movement direction along the second circulation loop so as to send liquid at the lower part of the absorbing device into the refrigerating device, and the liquid outlet end of the refrigerating device is communicated with the downstream second circulation loop so as to send the refrigerated liquid into the absorbing device. At least one stage of second heat exchanger is arranged on the second circulation loop and is positioned between the liquid inlet end and the liquid outlet end of the refrigerating device and the connection points of the second circulation loop respectively, in the actual working process, flue gas enters into countercurrent contact with concentrated solution (such as concentrated salt solution) sprayed on the top of the absorbing device or clear water from the bottom of the absorbing device, when in heating season, the concentrated solution absorbs water in the flue gas to thin, latent heat is released in the water phase change process, the flue gas and the salt solution are heated, the heated solution exchanges heat through the second heat exchanger or the refrigerating device on the second circulation loop, and the balance state in the absorbing device is flexibly controlled by taking away the heat; in the non-heating season, besides the concentrated solution, clear water can be used for spraying to cool the flue gas, and the saturated clean flue gas is cooled and separated, so that the water lifting effect is achieved, and the heated water can be recycled after heat exchange by the second heat exchanger or the refrigerating device. Finally, the sensible heat of the raw flue gas and the latent heat of the water vapor of the purified flue gas are deeply recovered and utilized by the means, so that a large number of cold sources are avoided in the prior art for cooling and condensing the flue gas, and water resources are greatly saved. Meanwhile, the water in the clean flue gas is recovered, the running cost of the system is reduced, the problem that a coal-fired power plant or other industries eliminate colored smoke plumes and a deep water lifting system is only put into a system without income is solved, the environment-friendly effects of high efficiency, energy conservation, emission reduction and the like are achieved, and the system has good social and economic effects.
2. According to the spray whitening device provided by the application, firstly, the water content of the clean flue gas is greatly reduced by utilizing the absorption device, and the dryness and the temperature of the clean flue gas are improved due to the latent heat released by phase change in the process of absorbing steam by the concentrated solution, so that the effects of eliminating colored smoke plumes, deeply extracting water, reducing the dust content of the clean flue gas and recovering the low-quality latent heat of the water vapor in the clean flue gas can be simultaneously achieved; then the concentrated solution after absorbing the water vapor in the absorption device is changed into a dilute solution, a part of the dilute solution is cooled by a fifth heat exchanger, then the original concentration is recovered by a regeneration system, and finally the dilute solution is returned to the absorption device; the other part of the water is heated by a second heat exchanger to heat a heat exchange medium (such as heat supply network water) and then returned to the absorption device, the two flow rates are adjusted according to specific requirements, and the water absorption capacity of the unit mass concentrated solution can be changed by adjusting the ratio of the two flow rates; in addition, the dilute solution sent to the regeneration system is subjected to air extraction heat exchange with saturated steam or steam turbine generated by the regeneration system, enters a flash tank for flash evaporation regeneration to become concentrated solution, and is then sent to an absorption device, the regeneration process utilizes saturated steam generated after secondary steam compression at the top of the regeneration system, the saturated steam releasing latent heat is changed into secondary steam condensate water, the secondary steam condensate water enters a fourth heat exchanger again to exchange heat with heat network water, and the cooled condensate water can be used for demister flushing water of a desulfurization device or used as process supplementing water and the like, so that the cost and energy consumption are reduced. The regeneration of power plant steam is avoided, and the steam consumption can be effectively reduced.
3. According to the spray whitening device provided by the application, steam is pumped by adopting the steam turbine in the heating season of the regeneration system, and is used as a regeneration driving heat source, and pumped condensate water is returned to the boiler for water supply after heat exchange by the third heat exchanger; the non-heating season adopts secondary steam of a compressor, a saturator and a flash tower, saturated steam generated after compression and condensed water are used for process water supplementing of the desulfurization device, or clear water spraying is adopted, or the two are combined. After the heat exchange and temperature rise of the heat supply network water or the low condensation water through the second heat exchanger of the absorption device, the heat exchange is carried out between the heat supply network water or the low condensation water and the third heat exchanger and the fourth heat exchanger of the regeneration system, the heating season reaches the requirement of the temperature of the heat supply network water, and the heat supply network is regenerated in the heating season; the low-adding-removing or low-temperature-saving economizer heat exchanging is performed in the non-heating season, and the low-adding-removing method can be used for heating low-adding condensed water, so that the power generation capacity of the non-heating season unit is not affected. The problems that a coal-fired power plant or other industries remove wet smoke plume and a deep water lifting system is only put into practice and has no benefit are solved in the above mode, the latent heat of the water vapor of the clean flue gas after the desulfurization device is further recovered through the compressor, the saturator and the flash tower system, the moisture in the clean flue gas is recovered, the running cost of the system is reduced, and the environment-friendly effects of high efficiency, energy conservation, emission reduction and the like are achieved.
4. The spraying and whitening device provided by the application not only can use the sensible heat of the original flue gas for heating the heat supply network water or adding the condensation water at a low level, but also can recover a great amount of latent heat of the steam in the flue gas, and deeply recover the flue gas waste heat. The device recovers water-saving resources by deep water lifting, and compared with the prior related technology, the device can reduce the pressure drop of the system by about one third due to simple system equipment, saves the operation cost and has good environmental protection and energy saving effects.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present application, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a layout of a spray whitening apparatus in an embodiment of the present application;
FIG. 2 is a schematic view of the structure of an absorber device in an embodiment of the present application;
FIG. 3 is a schematic diagram of a regeneration system according to an embodiment of the present application;
wherein the reference numerals are expressed as:
1-a dust removal device; 2-a desulfurizing device; 3-an absorption device; 3-1-a first spray unit; 3-2-a second spray unit; 4-an economizer; 5-a first pump; 6-a second pump; 7-a solution filtering tempering system; 8-a first heat exchanger; 9-a second heat exchanger; 10-a third heat exchanger; 11-fourth heat exchanger; 12-a third pump; 13-a fifth heat exchanger; 14-fourth pump; 15-a compressor; a 16-saturator; 17-sixth heat exchanger; 18-a flash tank; 19-chimney; 20-a solution replenishing tank; 21-a fifth pump; 22-a refrigeration device; 23-sixth pump; 24-a liquid storage device; 25-water storage device.
Detailed Description
The following description of the present application will be made clearly and fully, and it is apparent that the embodiments described are some, but not all, of the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
In the description of the present application, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.
In addition, the technical features of the different embodiments of the present application described below may be combined with each other as long as they do not collide with each other.
Example 1
The embodiment provides a spray whitening device, as shown in fig. 1 and 2, comprising a dust collector 1, a desulfurizing device 2 and an absorbing device 3 which are sequentially communicated, wherein the dust collector 1 can be an electric dust collector, the desulfurizing device 2 can be a desulfurizing tower, the absorbing device 3 can be an absorbing tower, the absorbing tower can be an empty tower or a filling tower, when the absorbing tower is a filling tower, the filling can be single-layer or multi-layer, the lower part of the absorbing device 3 is provided with a flue gas inlet, the upper part is provided with a flue gas outlet, the spray whitening device further comprises,
at least one stage of second circulation loop, the liquid inlet end of the second circulation loop is communicated with the lower part of the absorption device 3, the liquid outlet end is communicated with the upper part of the absorption device 3, so that the liquid at the liquid outlet end enters the absorption device 3 and is in countercurrent contact with the flue gas entering the absorption device 3; in this embodiment, as shown in fig. 1, the second circulation loop has two stages;
the refrigerating device 22 is communicated with the upstream second circulation loop along the fluid movement direction of the second circulation loop, so that liquid at the lower part of the absorption device 3 is sent to the refrigerating device 22, and the liquid outlet end of the refrigerating device 22 is communicated with the downstream second circulation loop so that the refrigerated liquid is sent to the absorption device 3; in the present embodiment, the refrigeration device 22 is a cooling tower or a closed mechanical ventilation cooling tower;
the at least one stage of second heat exchanger 9 is arranged on the second circulation loop and is positioned between the liquid inlet end and the liquid outlet end of the refrigeration device 22 and the connection points of the second circulation loop respectively; in the embodiment, the second heat exchanger 9 is two-stage and corresponds to the second circulation loop one by one; the second heat exchanger 9 is a plate heat exchanger; the liquid outlet end of the refrigerating device 22 is communicated with the second heat exchanger 9 so as to exchange heat between the circulating cooling water and the liquid from the lower part of the absorption device 3 in the second heat exchanger 9.
In the spraying and whitening device, at least one stage of second circulation loop is arranged, and the refrigerating device is arranged, in the fluid movement direction along the second circulation loop, the liquid inlet end of the refrigerating device is communicated with the upstream second circulation loop so as to send liquid at the lower part of the absorbing device into the refrigerating device, and the liquid outlet end of the refrigerating device is communicated with the downstream second circulation loop so as to send the refrigerated liquid into the absorbing device. At least one stage of second heat exchanger is arranged on the second circulation loop and is positioned between the liquid inlet end and the liquid outlet end of the refrigerating device and the connection points of the second circulation loop respectively, in the actual working process, flue gas enters into countercurrent contact with concentrated solution (such as concentrated salt solution) sprayed on the top of the absorbing device or clear water from the bottom of the absorbing device, when in heating season, the concentrated solution absorbs water in the flue gas to thin, latent heat is released in the water phase change process, the flue gas and the salt solution are heated, the heated solution exchanges heat through the second heat exchanger or the refrigerating device on the second circulation loop, and the balance state in the absorbing device is flexibly controlled by taking away the heat; in the non-heating season, besides the concentrated solution, clear water can be used for spraying to cool the flue gas, and the saturated clean flue gas is cooled and separated, so that the water lifting effect is achieved, and the heated water can be recycled after heat exchange by the second heat exchanger or the refrigerating device. Finally, the sensible heat of the raw flue gas and the latent heat of the water vapor of the purified flue gas are deeply recovered and utilized by the means, so that a large number of cold sources are avoided in the prior art for cooling and condensing the flue gas, and water resources are greatly saved. Meanwhile, the water in the clean flue gas is recovered, the running cost of the system is reduced, the problem that a coal-fired power plant or other industries eliminate colored smoke plumes and a deep water lifting system is only put into a system without income is solved, the environment-friendly effects of high efficiency, energy conservation, emission reduction and the like are achieved, and the system has good social and economic effects.
Further, the device also comprises a first circulation loop, wherein the liquid inlet end of the first circulation loop is communicated with the lower part of the absorption device 3, and the liquid outlet end of the first circulation loop is communicated with the upper part of the absorption device 3;
the first spraying unit 3-1 is arranged near the upper part of the absorption device 3 and is communicated with the liquid outlet end of the first circulation loop; specifically, as shown in fig. 2, the number of the first spraying units 3-1 is 1-2, in this embodiment 1, and when two, the first spraying units are divided into two upper and lower spraying layers, preferably two layers;
at least one stage of second spraying unit 3-2, close to the upper part of the absorption device 3, is arranged in the second spraying unit 3-2, and is communicated with the liquid outlet end of the second circulation loop; specifically, the number of the second spraying units 3-2 is 2-4, in this embodiment two, and the second spraying units are divided into two upper and lower spraying layers, preferably three layers.
In addition, the specific setting number of the first spraying units 3-1 and the second spraying units 3-2 can be determined according to the project smoke amount, and each circulating loop is independently provided with a heat exchanger or a circulating pump and is used for standby of movable equipment according to related specifications. The bottom solution at the lower section of the desulfurizing tower is divided into three parts: the first part is responsible for system regeneration through a first circulation loop (external circulation); the second part is responsible for maintaining the equilibrium state of the absorption system through a second circulation loop (internal circulation); the third part enters a solution filtering and conditioning unit, and the bottom of the lower section of the absorption tower is matched with the filtering and conditioning unit, so that on one hand, solid particles accumulated in the absorption tower and substances such as generated crystal salts (sulfate, carbonate and the like) and the like of the solution can be removed through a cyclone and a filtering device, and the pollutants and impurities of the solution in the absorption tower are controlled to a certain degree; on the other hand, calcium-based salt is added, the pH value of the solution is adjusted, the absorption capacity of the solution is maintained, and meanwhile, the corrosiveness of the solution is reduced. The absorption liquid enters from the top of the absorption tower, and flows reversely with the purified flue gas entering from the bottom of the absorption tower through uniform spraying, the water vapor in the purified flue gas is absorbed by the concentrated solution, and the spraying layers of the upper section and the lower section can be provided with standby layers so as to improve the reliability of the absorption tower. The water absorption capacity of the salt solution in unit mass can be controlled by adjusting the small circulating solution amount at the lower section of the absorption tower, the absorption tower is arranged behind the desulfurization tower, most of water absorption occurs at the part due to high water content of flue gas at the bottom of the absorption tower, the small circulation is arranged at the bottom of the absorption tower, the equilibrium temperature of the lower section of the absorption tower is controlled by reducing the temperature of the small circulation solution, so that the water absorption capacity of the solution in unit mass is improved, the concentration of the absorbed dilute solution is reduced by 1% -10% compared with that of the concentrated solution, and the ratio of the small circulation amount (second circulation loop) to the regeneration circulation amount (first circulation loop) can be 1:1-10:1.
Specifically, the first spraying unit 3-1 and the second spraying unit 3-2 comprise spraying pipes and spraying nozzles arranged on the spraying pipes at intervals, and the first spraying unit 3-1 and the second spraying unit 3-2 are close to the flue gas outlet of the absorption device 3 and are positioned below the flue gas outlet, so that the countercurrent contact path is prolonged, and heat in flue gas can be effectively recovered.
Further, the flue gas treatment device also comprises a water storage device 25 which is communicated with the second circulation loop, and the connection point of the water storage device 25 and the second circulation loop is close to the lower part of the absorption device 3, so that water in the water storage device 25 is sent into the absorption device 3 for circulating spraying of flue gas in a non-heating season; in heating season, water in the absorption device 3 is stored in the water storage device 25; specifically, the water storage device 25 is a clean water tank;
a liquid storage device 24, which is communicated with the first circulation loop, and the connection point of the liquid storage device 24 and the first circulation loop is close to the lower part of the absorption device 3, so as to store the absorption liquid in the absorption device 3 in the liquid storage device 24 in a non-heating season; in the heating season, the absorption liquid in the liquid storage device 24 is sent into the absorption device 3.
Further, as shown in fig. 3, the regeneration system further comprises a flash tank 18, wherein the regeneration system comprises a thin solution inlet arranged at the middle part, a steam outlet arranged at the upper part and a concentrated solution outlet arranged at the lower part; the lower part of the absorption device 3, the sixth heat exchanger 17 and the dilute solution inlet are sequentially communicated; the compressor 15 and the saturator 16, the steam outlet, the compressor 15, the saturator 16 and the sixth heat exchanger 17 are sequentially connected, so that the dilute solution and the secondary steam exchange heat in the sixth heat exchanger 17 and then enter the flash tank 18.
In addition, the driving heat source of the regeneration system heats the season and pumps air for the unit; the saturated steam generated by the secondary steam of the compressor, the saturator and the flash tower is adopted in the non-heating season, and the compressor, the saturator and the flash tower system can prevent the power generation capacity of the non-heating season unit from being affected. And heating the heat supply network water or the circulating heat medium water or the low-condensation water to different temperatures through the heat supply network heat exchanger in different seasons.
In the actual production process, during heating season, flue gas enters from the bottom of the absorption tower and flows in countercurrent with concentrated salt solution sprayed from the top of the absorption tower, the concentrated salt solution at the top of the absorption tower absorbs water in the flue gas to be diluted, latent heat is released in the water phase change process, and the flue gas and the salt solution are heated to 55-70 ℃. The heat exchange between the heat supply network backwater and the dilute solution is heated to 40-65 ℃, the dilute solution after heat exchange enters the fifth heat exchanger 13 for heat exchange and temperature rise, then enters a regeneration system for gasification and flash evaporation, the absorbed water is changed into secondary steam, and the concentrated solution at the bottom of the flash evaporation tank enters the fifth heat exchanger 13 for heat exchange and returns to the top of the absorption tower for spraying. And cutting off the regeneration system in the non-heating season, and spraying and cooling circulating cooling water manufactured by using a cooling tower or a closed mechanical ventilation cooling tower in an absorption tower to realize the environment-friendly requirement of eliminating wet smoke plume in the non-heating season of the power plant. The spray water can be directly cooled by a cooling tower or a mechanical ventilation cooling tower, and can also be indirectly exchanged with the refrigerant from the cooling tower or the mechanical ventilation cooling tower through a second heat exchanger. Of course, the regeneration system can be adopted to lift the flue gas in non-heating season, the secondary steam is discharged from the top of the regenerator and enters the compressor, the secondary steam is changed into superheated steam through pressurization and temperature increase, the superheated steam is changed into saturated steam through spraying, the saturated steam is used as a driving heat source of the regeneration system, latent heat is released, the saturated steam is changed into condensation water, the condensation water exchanges heat with the heat supply network water again, the heat supply network water (low-added condensation water) can be heated to about 60 ℃, and the condensation water after temperature reduction can be used for demister flushing water and the like in the desulfurizing tower. The operation mode can almost offset the pumping energy consumption and the recovery energy consumption in non-heating seasons, and does not negatively influence the generating capacity of the unit.
In addition, the device also comprises a fifth heat exchanger 13 which is arranged on the first circulation loop, wherein the lower part of the absorption device 3, the fifth heat exchanger 13, the sixth heat exchanger 17 and the dilute solution inlet are sequentially communicated, so that the bottom solution of the absorption tower is subjected to heat exchange with the concentrated solution from the concentrated solution outlet of the flash tank in the fifth heat exchanger 13, and is finally sent to the flash tank 18 after subjected to heat exchange by the sixth heat exchanger 17; the fifth heat exchanger 13 may be a plate heat exchanger;
the first heat exchanger 8 is also arranged, and the concentrated solution coming out of the fifth heat exchanger 13 can enter the first heat exchanger 8 to exchange heat with heat supply network water or low-adding condensed water and then enter the absorption device 3.
Example 2
The present embodiment provides a spray whitening device, on the basis of the above embodiment 1, in order to filter and modulate the concentrated solution in the absorption device 3 as the absorption liquid, the device further includes a solution filtering and conditioning system 7, and the lower part of the absorption device 3, the solution filtering and conditioning system 7, the second heat exchanger 9 and the second spray unit 3-2 are sequentially connected and arranged, so that the dilute solution is sent to the second spray unit 3-2 after filtering, conditioning and heat exchanging; specifically, the solution filtration conditioning system 7 is composed of a cyclone and a filter which are sequentially communicated, and a solution replenishing tank 20 and a fifth pump 21 which are sequentially communicated are provided at the same time, and the fifth pump 21 is communicated with the solution filtration conditioning system 7 to replenish the solution therein.
Example 3
The present embodiment provides a spray whitening device, which further includes a third heat exchanger 10 and a fourth heat exchanger 11 on the basis of the above embodiment 1 or 2, where the second heat exchanger 9, the third heat exchanger 10 and the fourth heat exchanger 11 are sequentially connected, so that the heat supply network incoming water or low-condensation water sequentially passes through the second heat exchanger 9, the third heat exchanger 10 and the fourth heat exchanger 11, and exchanges heat with substances entering the corresponding heat exchangers;
further, the sixth heat exchanger 17 is communicated with the third heat exchanger 10 and/or the fourth heat exchanger 11, so that the air-extracted condensed water of the sixth heat exchanger 17 is fed into the third heat exchanger 10 and/or the fourth heat exchanger 11 for heat exchange, then fed into the boiler, and the secondary steam condensed water of the sixth heat exchanger 17 is fed into the fourth heat exchanger 11 and/or the third heat exchanger 10 for heat exchange and then used as process supplementing water; the steam outlet is also communicated with the fourth heat exchanger 11 so as to send the secondary steam into the fourth heat exchanger 11 for heat exchange;
in order to realize the flow of the liquid, a first pump 5 is arranged between the lower part of the absorption device 3 and the second heat exchanger 9 or between the second heat exchanger 9 and the second spraying unit 3-2; a second pump 6 is arranged between the lower part of the absorption device 3 and the solution filtering and conditioning system 7, or between the solution filtering and conditioning system 7 and the second heat exchanger 9, or between the second heat exchanger 9 and the second spraying unit 3-2; a third pump 12 is arranged between the lower part of the absorption device 3 and the fifth heat exchanger 13, or between the fifth heat exchanger 13 and the sixth heat exchanger 17, or between the sixth heat exchanger 17 and the flash tank 17; a fourth pump 14 is arranged between the concentrated solution outlet and the fifth heat exchanger 13 or between the fifth heat exchanger 13 and the first spraying unit 3-1; a sixth pump 23 is provided between the liquid outlet end of the refrigerating device 22 and the second circulation loop for connecting the liquid outlet end and the second circulation loop.
Example 4
The present embodiment provides a spray whitening device, which further includes an economizer 4 disposed between the dust removing device 1 and the desulfurizing device 2 or between the air preheater and the dust removing device 1 on the basis of the above embodiments 1, 2 or 3, and the fourth heat exchanger 11 is communicated with the economizer 4 to exchange heat between the heat supply network incoming water or low condensation water and the flue gas from the dust removing device 1 in the economizer 3-6, and send the flue gas after heat exchange into the desulfurizing device 2.
Further, a smoke inlet is arranged at the lower part of the absorption device 3, a smoke outlet is arranged at the upper part of the absorption device, the smoke outlet is communicated with the chimney 19, and the first spraying unit 3-1 and the second spraying unit 3-2 are positioned between the smoke inlet and the smoke outlet; the demister is arranged in the absorption device and is positioned between the first spraying unit 3-1 and the flue gas outlet.
If the smoke temperature needs to be raised to a higher temperature, a reheat heat exchanger can be arranged on a rear flue of the smoke outlet 3-4 of the absorption device 3 or a heat pipe can be replaced in the top of the upper section of the absorption device 3 to heat the smoke temperature to the temperature required by environmental protection or owners.
In addition, the specific working principle of the device is as follows:
in the non-heating season, the third pump 12 is used for completely discharging the absorption liquid at the bottom of the absorption tower into the liquid storage device 24, then the circulating pump is used for introducing clean water into the absorption tower from the water storage device 25, the water storage device 25 is closed after a certain liquid level exists in the absorption tower, the first pump 5 is used for conveying the clean water at the bottom of the absorption tower to the top of the tower for spraying, the temperature of the spray water and flue gas rises after mass transfer and heat transfer in the absorption tower, condensed water enters into circulating cooling water, and the cooling water after the temperature rise at the bottom of the absorption tower is conveyed to the refrigerating device 22 for cooling. The refrigerating device 22 adopts a cooling tower or a closed mechanical ventilation cooling tower, the circulating cooling water after temperature rise can be directly sent to the cooling tower or the closed mechanical ventilation cooling tower, the water recovered in the cooling tower is taken away by air, the closed mechanical ventilation cooling tower can not evaporate excessive condensed water, the excessive water is removed before entering the closed mechanical ventilation cooling tower, and the rest enters the mechanical ventilation cooling tower again; of course, the circulating cooling water after temperature rising can exchange heat through the second heat exchanger, the refrigerant of the second heat exchanger comes from the cooling water of the cooling tower or the closed mechanical ventilation cooling tower, and condensed water also needs to be removed before the circulating cooling water at the bottom of the tower after temperature rising enters the second heat exchanger.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the application.
Claims (5)
1. The spray whitening device comprises an absorption device and is characterized by also comprising,
at least one stage of second circulation loop, the liquid inlet end of the second circulation loop is communicated with the lower part of the absorption device, the liquid outlet end is communicated with the upper part of the absorption device, so that the liquid at the liquid outlet end enters the absorption device and is in countercurrent contact with the flue gas entering the absorption device;
the liquid inlet end of the refrigerating device is communicated with the upstream second circulation loop along the fluid movement direction of the second circulation loop so as to send liquid at the lower part of the absorbing device into the refrigerating device, and the liquid outlet end of the refrigerating device is communicated with the downstream second circulation loop so as to send the refrigerated liquid into the absorbing device;
the at least one stage of second heat exchanger is arranged on the second circulation loop and is positioned between the liquid inlet end and the liquid outlet end of the refrigeration device and the connection point of the second circulation loop respectively;
the liquid outlet end of the refrigerating device is communicated with the second heat exchanger so as to exchange heat between circulating cooling water and liquid from the lower part of the absorption device in the second heat exchanger;
the liquid inlet end of the first circulation loop is communicated with the lower part of the absorption device, and the liquid outlet end of the first circulation loop is communicated with the upper part of the absorption device;
the first spraying unit is arranged in the absorption device and is close to the upper part of the absorption device, and the first spraying unit is communicated with the liquid outlet end of the first circulation loop;
at least one stage of second spraying unit is arranged in the absorption device near the upper part of the absorption device, and the second spraying unit is communicated with the liquid outlet end of the second circulation loop;
a regeneration system disposed on the first circulation loop, the regeneration system comprising,
the flash tank is provided with a dilute solution inlet at the middle part, a steam outlet at the upper part and a concentrated solution outlet at the lower part;
the lower part of the absorption device, the sixth heat exchanger and the dilute solution inlet are sequentially communicated;
the steam outlet, the compressor, the saturator and the sixth heat exchanger are sequentially communicated, so that the dilute solution at the lower part of the absorption device and the secondary steam exchange heat in the sixth heat exchanger in a heating season and then enter the flash tank;
the spray whitening device further comprises a spray whitening device,
the fifth heat exchanger is arranged on the first circulation loop, the lower part of the absorption device, the fifth heat exchanger, the sixth heat exchanger and the dilute solution inlet are sequentially communicated, so that heat exchange is performed between the fifth heat exchanger and the concentrated solution from the concentrated solution outlet of the flash tank, and the heat exchange is performed through the sixth heat exchanger and then the heat exchange is performed, and the heat exchange is finally sent to the flash tank;
the second heat exchanger, the third heat exchanger and the fourth heat exchanger are sequentially communicated, so that the heat supply network incoming water or low-condensation water sequentially passes through the second heat exchanger, the third heat exchanger and the fourth heat exchanger and exchanges heat with substances entering the corresponding heat exchangers;
the sixth heat exchanger is communicated with the third heat exchanger and/or the fourth heat exchanger, so that the air-extracted condensed water of the sixth heat exchanger is fed into the third heat exchanger and/or the fourth heat exchanger for heat exchange, then fed into the boiler for water supply, and the secondary steam condensed water of the sixth heat exchanger is fed into the fourth heat exchanger and/or the third heat exchanger for heat exchange and then used as process supplementing water;
the steam outlet is also communicated with the fourth heat exchanger so as to send the secondary steam into the fourth heat exchanger for heat exchange.
2. The apparatus of claim 1, further comprising,
the water storage device is communicated with the second circulation loop, and the connection point of the water storage device and the second circulation loop is close to the lower part of the absorption device, so that water in the water storage device is sent into the absorption device for circulating spraying of flue gas in a non-heating season; in heating season, storing the water in the absorption device in the water storage device;
the liquid storage device is communicated with the first circulation loop, and the connection point of the liquid storage device and the first circulation loop is close to the lower part of the absorption device so as to store absorption liquid in the absorption device in the liquid storage device in a non-heating season; and in a heating season, sending the absorption liquid in the liquid storage device into the absorption device.
3. The device according to claim 1, further comprising a solution filtering and conditioning system, wherein the lower part of the absorption device, the solution filtering and conditioning system, the second heat exchanger and the second spraying unit are sequentially communicated, so that the dilute solution is fed into the second spraying unit after filtering and conditioning and heat exchanging;
the flue gas desulfurization device comprises a dust removing device and a desulfurizing device which are sequentially communicated, wherein the desulfurizing device is communicated with an absorbing device, so that the flue gas sequentially passes through the dust removing device and the desulfurizing device and then enters the absorbing device.
4. The apparatus of claim 3, further comprising,
the fourth heat exchanger is communicated with the economizer so as to exchange heat incoming water or low-condensation water of the heat supply network with flue gas from the dust removing device in the economizer and send the flue gas after heat exchange into the desulfurizing device.
5. The device according to any one of claims 1 to 4, wherein a lower part of the absorption device is provided with a flue gas inlet, an upper part is provided with a flue gas outlet, the flue gas outlet is communicated with a chimney, and the first spraying unit and the second spraying unit are positioned between the flue gas inlet and the flue gas outlet;
the demister is arranged in the absorption device and is positioned between the first spraying unit and the flue gas outlet.
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| CN109939459A (en) * | 2019-03-21 | 2019-06-28 | 东南大学 | A kind of the low-temperature dust-containing flue gas eliminating white smoke device and working method of condensed in two stages and solution dehumidification |
| CN110407384A (en) * | 2019-07-10 | 2019-11-05 | 中国华电科工集团有限公司 | A kind of waste heat recycles the device for the white joint wastewater treatment that disappears |
| CN110500602A (en) * | 2019-08-15 | 2019-11-26 | 中国华电科工集团有限公司 | A kind of energy-saving and water-saving and cold-heat combined device |
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