CN108159868B - Desulfurization waste water and chimney white smoke plume cooperative treatment system - Google Patents
Desulfurization waste water and chimney white smoke plume cooperative treatment system Download PDFInfo
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- CN108159868B CN108159868B CN201810214037.2A CN201810214037A CN108159868B CN 108159868 B CN108159868 B CN 108159868B CN 201810214037 A CN201810214037 A CN 201810214037A CN 108159868 B CN108159868 B CN 108159868B
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- desulfurization
- waste water
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- slurry
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- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 79
- 230000023556 desulfurization Effects 0.000 title claims abstract description 79
- 239000002351 wastewater Substances 0.000 title claims abstract description 76
- 239000000779 smoke Substances 0.000 title claims abstract description 20
- 239000002002 slurry Substances 0.000 claims abstract description 31
- 230000003009 desulfurizing effect Effects 0.000 claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- 239000000498 cooling water Substances 0.000 claims description 8
- 150000003839 salts Chemical class 0.000 claims description 6
- 238000004065 wastewater treatment Methods 0.000 claims description 2
- 238000011278 co-treatment Methods 0.000 claims 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical class [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 12
- 239000003546 flue gas Substances 0.000 abstract description 9
- 238000002425 crystallisation Methods 0.000 abstract description 8
- 230000008025 crystallization Effects 0.000 abstract description 8
- 230000008020 evaporation Effects 0.000 abstract description 8
- 238000001704 evaporation Methods 0.000 abstract description 8
- 238000001816 cooling Methods 0.000 abstract description 5
- 238000004134 energy conservation Methods 0.000 abstract description 2
- 239000003344 environmental pollutant Substances 0.000 description 6
- 238000005265 energy consumption Methods 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000005507 spraying Methods 0.000 description 4
- 238000012546 transfer Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000011033 desalting Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000001502 supplementing effect Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
- B01D53/504—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific device
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Environmental & Geological Engineering (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
Abstract
The invention belongs to the technical field of energy conservation and emission reduction of thermal power units, and discloses a desulfurization waste water and chimney white smoke plume cooperative treatment system. The desulfurization waste water and chimney white smoke plume cooperative treatment system comprises a waste water tank and a desulfurization tower, wherein the waste water tank is communicated with a waste water inlet pipeline, desulfurization waste water is contained at the bottom of the waste water tank, an evaporator is arranged in the desulfurization waste water, and the working pressure of the waste water tank is negative pressure; the desulfurizing slurry is arranged in the desulfurizing tower and circulates along the evaporator. According to the invention, the crystallization of wastewater is realized by utilizing the heat of the desulfurization slurry in the desulfurization tower, and meanwhile, the cooling of the slurry is also realized, and the reduction of the slurry temperature can improve the desulfurization efficiency, reduce the saturated flue gas temperature of the desulfurization outlet and greatly reduce the moisture content of the flue gas at the inlet of the chimney, so that the white smoke plume of the chimney is lightened; further, the temperature of the desulfurization slurry in the evaporator is not too high, so that the influence of scaling of desulfurization wastewater is avoided by utilizing the low-temperature evaporation principle.
Description
Technical Field
The invention relates to the technical field of energy conservation and emission reduction of thermal power generating units, in particular to a desulfurization waste water and chimney white smoke plume cooperative treatment system.
Background
In the prior art, desulfurization facilities of a thermal power plant in China are generally wet limestone-gypsum desulfurization, and further advanced treatment is required to recycle wastewater after desulfurization treatment of a coal-fired power plant so as to realize real wastewater zero emission of the power plant. The prior desulfurization wastewater advanced treatment mode mainly comprises the following steps: natural evaporation tanks, membrane technology desalting, electrolytic desalting, evaporative crystallization and the like. The most thorough way of the desulfurization wastewater treatment of the coal-fired power plant is evaporation crystallization by the prior art, and the salt is separated and treated in a solid form, so that the effect of zero emission can be achieved.
However, the existing evaporative crystallization process has the defects of high energy consumption, easy scaling and the like.
Meanwhile, for a flue gas system without a rotary GGH (GAS GAS HEATER, gas-gas heat exchanger), because flue gas discharged from a chimney after passing through FGD (Flue Gas Desulphurization, desulfurizing tower) is in a saturated state, condensed water vapor can form white smoke plume when the ambient temperature is lower. The existing white smoke plume treatment technology generally has the problems of high system energy consumption, high investment, serious corrosion of a smoke heater and the like.
Along with the increasing requirement of pollutant emission of coal-fired thermal power generation, the search for an economic, reasonable, efficient, environment-friendly and reliable multi-pollutant synergistic flue gas treatment system is extremely important and urgent.
Disclosure of Invention
The invention aims to provide a desulfurization waste water and chimney white smoke plume cooperative treatment system, which aims to solve the problem of high energy consumption in the existing desulfurization waste water evaporation and crystallization process.
To achieve the purpose, the invention adopts the following technical scheme:
a desulfurization wastewater and chimney white smoke plume co-processing system, comprising:
The waste water tank is communicated with a waste water inlet pipeline, the bottom of the waste water tank is filled with the desulfurization waste water, an evaporator is arranged in the desulfurization waste water, and the working pressure of the waste water tank is negative pressure;
The desulfurizing tower is internally provided with desulfurizing slurry, and the desulfurizing slurry flows along the evaporator. Preferably, a slurry booster pump is connected between the evaporator and the desulfurizing tower.
Preferably, the wastewater tank is communicated with a condenser, and the condenser is provided with a vacuum pumping system.
Preferably, the vacuumizing system is a water ring type vacuum pump set.
Preferably, the waste water tank is in communication with the condenser via a steam conduit.
Preferably, the condenser is further provided with a cooling water booster pump, and the bottom of the condenser is provided with a water drain pump.
Preferably, the bottom of the wastewater tank is provided with a crystallized salt/concentrated solution output pipeline.
Preferably, the evaporator is a dividing wall type heat exchanger.
Preferably, the condenser is a hybrid heat exchanger.
Preferably, the condenser is a dividing wall type heat exchanger.
The invention has the beneficial effects that:
According to the invention, the heat of the desulfurization slurry in the desulfurization tower is utilized to realize crystallization of desulfurization wastewater, and the cooled desulfurization slurry returns to the desulfurization slurry pool or enters the spraying layer to form a low-temperature spraying layer, so that the desulfurization slurry is cooled, and the energy consumption is lower; the reduction of the temperature of the desulfurization slurry can reduce the water consumption of desulfurization, improve the desulfurization efficiency, reduce the saturated flue gas temperature of a desulfurization outlet and greatly reduce the moisture content of flue gas at the inlet of a chimney, thereby reducing the white smoke plume of the chimney; further, the temperature of the desulfurization slurry in the evaporator is not too high, so that the influence of scale formation on desulfurization wastewater is avoided by utilizing the low-temperature evaporation principle, and the beneficial effect of cooperative treatment of multiple pollutants is achieved.
Drawings
FIG. 1 is a schematic structural diagram of a desulfurization wastewater and chimney white smoke plume cooperative treatment system provided by the invention;
fig. 2 is a schematic structural view of another desulfurization wastewater and chimney white smoke plume cooperative treatment system provided by the invention.
In the figure:
1. A waste water tank; 2. an evaporator; 3. a slurry booster pump; 4. a condenser; 5. a cooling water booster pump; 6. a drainage pump; 7. a vacuum pumping system; 8. a waste water inlet pipe; 9. a steam pipe; 10. a crystallized salt/concentrate output conduit; 11. a desulfurizing tower; 12. an inlet flue of the desulfurizing tower; 13. outlet flue of desulfurizing tower; 14. a chimney; 15. a condensing tube group.
Detailed Description
The technical scheme of the invention is further described below by the specific embodiments with reference to the accompanying drawings.
As shown in fig. 1, the desulfurization wastewater and chimney white smoke plume cooperative treatment system provided by the invention comprises a wastewater tank 1 and a desulfurization tower 11, wherein the wastewater tank 1 and the desulfurization tower 11 are connected through an evaporator 2, specifically, a wastewater tank at the bottom of the wastewater tank 1 is connected with a desulfurization slurry tank at the bottom of the desulfurization tower 11 through the evaporator 2, and a slurry booster pump 3 is further arranged in a pipeline of the evaporator 2 and used for providing power for conveying desulfurization slurry from the desulfurization slurry tank to the evaporator 2, and the slurry booster pump 3 is preferably arranged at the inlet end of the evaporator 2.
Specifically, the top of the waste water tank 1 is provided with a steam pipeline 9, the steam pipeline 9 is communicated with the condenser 4, the condenser 4 is provided with a vacuumizing system 7, and noncondensable gas in the whole system is pumped out by the vacuumizing system 7. Preferably, the vacuumizing system 7 is a water ring type vacuum pump set, so that the working pressure in the wastewater tank 1 and the condenser 4 is negative, preferably the working pressure is 3 KPa-12 KPa, and the flow and condensation of water vapor evaporated from the desulfurization wastewater are easier to promote. Specifically, a crystallized salt/concentrated solution output pipe 10 for discharging crystallized salt/concentrated solution generated by evaporation out of the wastewater tank is provided at the bottom of the wastewater tank 1.
Specifically, a cooling water booster pump 5 for pumping cooling water into the condenser 4 is provided on the condenser 4, and a water-consuming place for conveying condensed water cooled by the condenser 4 to a cooling tower (not shown) or a desulfurization water supplementing tank (not shown) or the like is provided on the bottom of the condenser 4. It will be appreciated that the condenser 4 may directly exchange heat with the cooling water pumped by the cooling booster pump 5, or a condensation pipe group 15 may be disposed in the condenser 4 to form a divided wall type heat exchanger (as shown in fig. 2, i.e. form a coil or plate type structure) and exchange heat with incoming steam.
Specifically, the evaporator 2 is a dividing wall type heat exchanger, that is, a coil pipe type or plate type structure is formed, so that the heat transfer area of the evaporator 2 is ensured, and in order to further ensure the heat transfer and anti-scaling effects, the evaporator 2 can be made of non-metal materials such as graphite or ceramic with good corrosion resistance, or copper alloy materials, and in the embodiment, the evaporator 2 is preferably made of stainless steel. Because the temperature of the desulfurization slurry in the evaporator 2 is not too high (usually about 50 ℃), the low-temperature evaporation principle (namely low evaporation temperature and low scaling tendency of the heat transfer surface) is utilized, the influence of scaling of desulfurization wastewater is avoided, and the beneficial effect of multi-pollutant cooperative treatment is achieved. To further secure the anti-scaling effect, it is preferable to perform wastewater softening treatment such as slaked lime-soda process to precipitate Ca 2+ and Mg 2+ in the desulfurization wastewater after the wastewater enters the wastewater tank 1 through the wastewater inlet pipe 8.
Specifically, the desulfurizing tower 11 is provided with a desulfurizing tower inlet flue 12 and a desulfurizing tower outlet flue 13, the desulfurizing tower outlet flue 13 is communicated with a chimney 14, crystallization of desulfurization wastewater is realized by utilizing heat of desulfurization slurry in the desulfurizing tower 11, and meanwhile, the cooled desulfurization slurry returns to a desulfurization slurry pool or enters a spraying layer to form a low-temperature spraying layer, so that cooling of the desulfurization slurry is realized, and the energy consumption of the whole system is lower; the reduction of the temperature of the desulfurization slurry can reduce the water consumption of desulfurization, improve the desulfurization efficiency, reduce the saturated flue gas temperature of the desulfurization outlet, greatly reduce the moisture content of the flue gas at the inlet of the chimney 14, and achieve the beneficial effect of multi-pollutant cooperative treatment. Through calculation, the normal working pressure of the waste water tank 1 and the condenser 4 is 3 KPa-12 KPa, the desulfurization slurry entering the waste water tank 1 is generally about 50 ℃, the temperature of flue gas at the outlet of the desulfurization tower is reduced by 1 ℃ to 3 ℃, a large amount of water is separated out in the desulfurization tower 11, the water vapor amount carried by the flue gas entering the chimney 14 is reduced, and the white smoke plume phenomenon of the chimney 14 is greatly lightened.
The working principle of the invention is as follows: the waste water tank 1 and the condenser 4 are connected by a steam pipeline 9, and the normal working pressure is negative pressure (such as absolute pressure 3 KPa-12 Kpa). The desulfurization waste water after preliminary softening treatment enters the waste water tank 1, the waste water absorbs the heat of the desulfurization slurry in the evaporator 2 to be evaporated and crystallized, the steam enters the condenser 4, the cooling water pumped by the cooling water booster pump 5 is condensed, the produced condensed water is sent to the water using positions of the cooling tower or the desulfurization water supplementing tank and the like by the drainage pump 6, and the non-condensable gas in the system is pumped out by the vacuumizing system 7.
In conclusion, the technical route adopted by the invention can avoid the defects of easy scaling of the heat transfer surface and high steam consumption of the conventional wastewater evaporative crystallization system, and realizes the cooperative treatment of multiple pollutants.
It is to be understood that the above examples of the present invention are provided for clarity of illustration only and are not limiting of the embodiments of the present invention. Other variations or modifications of the above description will be apparent to persons of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention as set forth in the claims.
Claims (7)
1. Desulfurization waste water and chimney white smoke plume coprocessing system, characterized by comprising:
The desulfurization waste water treatment device comprises a waste water tank (1), wherein the waste water tank is communicated with a waste water inlet pipeline (8), the bottom of the waste water tank (1) is filled with desulfurization waste water, an evaporator (2) is arranged in the desulfurization waste water, and the working pressure of the waste water tank (1) is negative pressure;
A desulfurization tower (11) in which desulfurization slurry is provided, the desulfurization slurry flowing along the evaporator (2);
The wastewater tank (1) is communicated with the condenser (4), and the condenser (4) is provided with a vacuumizing system (7); the waste water tank (1) is communicated with the condenser (4) through a steam pipeline (9); the bottom of the wastewater tank (1) is provided with a crystallized salt/concentrated solution output pipeline (10);
the desulfurizing tower (11) is provided with a desulfurizing tower inlet flue (12) and a desulfurizing tower outlet flue (13), and the desulfurizing tower outlet flue (13) is communicated with a chimney (14).
2. The desulfurization wastewater and chimney white smoke plume cooperative treatment system according to claim 1, wherein a slurry booster pump (3) is connected between the evaporator (2) and the desulfurization tower (11).
3. The desulfurization wastewater and chimney white smoke plume cooperative treatment system according to claim 1, wherein the vacuumizing system (7) is a water ring type vacuum pump set.
4. The desulfurization wastewater and chimney white smoke plume cooperative treatment system according to claim 1, wherein the condenser (4) is further provided with a cooling water booster pump (5), and the bottom of the condenser (4) is provided with a drain pump (6).
5. The desulfurization wastewater and chimney white plume cooperative treatment system according to claim 1, wherein the evaporator (2) is a dividing wall type heat exchanger.
6. The desulfurization wastewater and chimney white plume co-treatment system according to any one of claims 1-4, wherein the condenser (4) is a hybrid heat exchanger.
7. The desulfurization wastewater and chimney white plume co-treatment system according to any one of claims 1-4, wherein the condenser (4) is a dividing wall type heat exchanger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810214037.2A CN108159868B (en) | 2018-03-15 | 2018-03-15 | Desulfurization waste water and chimney white smoke plume cooperative treatment system |
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| CN201810214037.2A CN108159868B (en) | 2018-03-15 | 2018-03-15 | Desulfurization waste water and chimney white smoke plume cooperative treatment system |
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| Publication Number | Publication Date |
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| CN108159868A CN108159868A (en) | 2018-06-15 |
| CN108159868B true CN108159868B (en) | 2024-04-26 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108993120B (en) * | 2018-07-27 | 2023-11-28 | 华电电力科学研究院有限公司 | Desulfurization wastewater collaborative dedusting and demisting device and dedusting and demisting process |
| CN109289476A (en) * | 2018-10-08 | 2019-02-01 | 哈尔滨工大金涛科技股份有限公司 | Wet desulfurization flue gas takes off white device and de- whitening method |
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| CN103691260A (en) * | 2013-12-23 | 2014-04-02 | 北京国电清新环保技术股份有限公司 | Heat recovery water-saving system for desulfuration by wet process and process thereof |
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2018
- 2018-03-15 CN CN201810214037.2A patent/CN108159868B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103691260A (en) * | 2013-12-23 | 2014-04-02 | 北京国电清新环保技术股份有限公司 | Heat recovery water-saving system for desulfuration by wet process and process thereof |
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