CN112875785A - Deep treatment system and method for wet desulphurization wastewater of coal-fired boiler - Google Patents

Deep treatment system and method for wet desulphurization wastewater of coal-fired boiler Download PDF

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CN112875785A
CN112875785A CN202110093040.5A CN202110093040A CN112875785A CN 112875785 A CN112875785 A CN 112875785A CN 202110093040 A CN202110093040 A CN 202110093040A CN 112875785 A CN112875785 A CN 112875785A
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wastewater
coal
fired boiler
desulfurization
wet desulphurization
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刘政修
梅东升
蔡来生
冯宝泉
毛永清
郭永红
郭强
赵潇然
梁国杰
朱迎春
杜志刚
彭晓军
陈国伟
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Beijing Jingneng Energy Technology Research Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/02—Treatment of water, waste water, or sewage by heating
    • C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
    • C02F1/06—Flash evaporation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D1/00—Evaporating
    • B01D1/16—Evaporating by spraying
    • B01D1/18—Evaporating by spraying to obtain dry solids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D1/00—Evaporating
    • B01D1/26—Multiple-effect evaporating
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/02—Treatment of water, waste water, or sewage by heating
    • C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
    • C02F1/048—Purification of waste water by evaporation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/02—Treatment of water, waste water, or sewage by heating
    • C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
    • C02F1/16—Treatment of water, waste water, or sewage by heating by distillation or evaporation using waste heat from other processes
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents

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  • Water Supply & Treatment (AREA)
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  • Chemical Kinetics & Catalysis (AREA)
  • Heat Treatment Of Water, Waste Water Or Sewage (AREA)

Abstract

The invention provides a system and a method for advanced treatment of wet desulphurization wastewater of a coal-fired boiler. The advanced treatment system and method for the wet desulphurization wastewater of the coal-fired boiler comprise: step A: carrying out flash evaporation concentration on the desulfurization wastewater from the coal-fired boiler to form a desulfurization wastewater concentrated solution; and B: the concentrated solution of the desulfurization wastewater enters a spray dryer for evaporation and drying, dust and water vapor generated in the evaporation and drying process are introduced into a flue before electric precipitation along with flue gas, chloride ions, other solid particles and metal elements are captured by electric precipitation, and the evaporated water vapor enters a desulfurization tower. The invention also provides a system for advanced treatment of the wet desulphurization wastewater of the coal-fired boiler, which adopts the advanced treatment method for the wet desulphurization wastewater of the coal-fired boiler. The invention realizes energy reutilization, improves the utilization rate of energy, has no external steam input in the whole evaporation process, and realizes low energy consumption.

Description

Deep treatment system and method for wet desulphurization wastewater of coal-fired boiler
Technical Field
The invention relates to the field of coal-fired power generation, in particular to a system and a method for treating wet desulphurization wastewater of a coal-fired boiler, and especially relates to a system and a method for deeply treating the wet desulphurization wastewater of the coal-fired boiler.
Background
In order to prevent the desulfurization equipment from being corroded and ensure the quality of gypsum during the operation of the coal-fired boiler, a certain amount of desulfurization wastewater needs to be discharged from the desulfurization absorption tower.
The traditional desulfurization wastewater treatment process usually adopts oxidation, neutralization, precipitation, flocculation and clarificationA cleaning process, wherein sodium hypochlorite preoxidation, Ca (OH) are arranged in a matching way2Neutralizing, organic sulfur, FeClSO4 flocculating, coagulant aid precipitating, sodium sulfite reducing and the like, and discharging or using the treated desulfurization wastewater to dry ash (slag) humidifying and ash field spraying dust settling after reaching DL/T997-2006 Water quality control index of limestone-gypsum wet desulfurization wastewater of thermal power plants.
In the year 2015, 4 months, a water pollution prevention and control action plan (abbreviated as 'ten items of water') is issued by the state institute, and the national water environment quality is improved in stages by 2020, the severely polluted water body is greatly reduced, the drinking water safety guarantee level is continuously improved, and the groundwater pollution exacerbation trend is preliminarily restrained; the development of circulation is required to be promoted, and the advanced treatment and recycling of the wastewater are encouraged; the method has the advantages that a prospective technology is researched and developed, scientific and technological resources are integrated, and the technologies of advanced wastewater treatment, industrial high-salinity wastewater desalination and the like in key industries are quickened to research and develop; and (4) prohibiting the desulfurization wastewater of the coal-fired power plant from being discharged. DL/T5046-: desulfurization waste water should be handled the retrieval and utilization, when zero release requires, should carry out advanced treatment to desulfurization waste water.
The existing advanced treatment technology for desulfurization wastewater of coal-fired power plants mainly comprises pretreatment softening technology, concentration and decrement technology, evaporative crystallization technology and the like of desulfurization wastewater, and the concentration and decrement technology comprises membrane method concentration (RO, FO, ED and the like) and thermal method concentration (concentration by utilizing steam, flue waste heat and the like). The comparison of the advanced treatment performance of the conventional desulfurization wastewater is shown in Table 1
TABLE 1 analysis of the Performance of the conventional desulfurization waste Water advanced treatment
Figure BDA0002913391870000011
Figure BDA0002913391870000021
From the conventional desulfurization wastewater advanced treatment, it can be known that: the existing desulfurization wastewater treatment needs adding a medicament for pollution softening, and high-salt mud cakes are generated, so that the treatment process is complex and the cost is high.
In summary, the following problems exist in the prior art: the existing desulfurization wastewater treatment needs adding a medicament for pollution softening, and high-salt mud cakes are generated, so that the treatment process is complex and the cost is high.
Disclosure of Invention
The invention provides a system and a method for advanced treatment of wet desulphurization wastewater of a coal-fired boiler, which aim to solve the problems that the desulphurization wastewater treatment needs adding a medicament for pollution softening, high-salt mud cakes are generated, the treatment process is complex and the cost is high.
Therefore, the invention provides a system and a method for advanced treatment of wet desulphurization wastewater of a coal-fired boiler, wherein the system and the method for advanced treatment of wet desulphurization wastewater of the coal-fired boiler comprise the following steps:
step A: carrying out flash evaporation concentration on the desulfurization wastewater from the coal-fired boiler to form a desulfurization wastewater concentrated solution;
and B: the concentrated solution of the desulfurization wastewater enters a spray dryer for evaporation and drying, dust and water vapor generated in the evaporation and drying process are introduced into a flue before electric precipitation along with flue gas, chloride ions, other solid particles and metal elements are captured by electric precipitation, and the evaporated water vapor enters a desulfurization tower.
Furthermore, in the step A, the desulfurization wastewater does not need a pretreatment system, and the heat of the low-temperature economizer is directly utilized to preheat the desulfurization wastewater.
Further, in the step A, triple-effect flash evaporation concentration is adopted for flash evaporation concentration.
Further, in the step A, the liquid level, the concentration and the temperature in the container are adjusted by controlling the operation of the pump and the valve, so that the flash evaporation concentration of the desulfurization wastewater is realized.
Further, in step B, the number of spray dryers is two, and the two spray dryers are arranged in parallel.
The advanced treatment system for the wet desulphurization wastewater of the coal-fired boiler adopts the advanced treatment method for the wet desulphurization wastewater of the coal-fired boiler, and comprises the following steps: a flash concentration system and a spray drying system connected to each other.
Further, the flash concentration system comprises: in series: first effect flash vessel, two effect flash vessel, three effect flash vessel, thickener and dredge pump, the concentrated system of flash distillation still includes: a cooling water return pipeline connected with the thickener and a condensation water tank connected with the cooling water return pipeline.
Further, a heat exchanger is arranged between the cooling water return pipeline and the condensation water tank.
Further, the spray drying system comprises: the spray dryer and the electric dust removal front flue connected with the spray dryer are connected, and the electric dust removal front flue is connected with the desulfurizing tower.
Further, the number of the spray dryers is two, and the two spray dryers are arranged in parallel.
Because the technologies of low-temperature flash evaporation, calcium sulfate crystal seeds, high-speed circulation and the like are adopted, the salts in the desulfurization wastewater mainly exist in the forms of sulfate, chloride, sulfite, carbonate and gypsum, and the salts can not cause scaling in the evaporation process. The whole system can not be scaled.
The waste heat at the tail part of the flue is used for heating the desulfurization waste water, so that the comprehensive utilization of preheating is realized, and the energy is saved and the consumption is reduced. The desulfurization waste water is heated by using the heat of the low-temperature economizer by adopting a triple-effect flash evaporation concentration technology, so that the energy is recycled, the utilization rate of the energy is improved, no external steam is input in the whole evaporation process, and the low energy consumption is realized.
The process of flash evaporation concentration and concentrated solution drying is adopted, and the method has the advantages of small occupied area of equipment, low investment and operation cost, high automation degree and the like.
Drawings
FIG. 1 is a schematic diagram of the working principle of the system and method for advanced treatment of wastewater from wet desulphurization of coal-fired boiler of the present invention;
FIG. 2 is a schematic diagram of the operation of the flash evaporation concentration stage of desulfurized wastewater of the present invention.
The reference numbers illustrate:
1. a coal-fired boiler; 2. a denitration device; 3. an air preheater; 4. a dust remover; 5. a tubular dust collector; 6. a fan; 7. a spray dryer (spray dryer); 8. a flue; 80. an ash conveying device; 9. compressing air; 10. a feed pump; 11. desulfurization waste water concentrated solution; 12. a thickener; 13. a multi-effect flash evaporator; 14. an evaporation circulating pump; 15. a circulation pump; 16. a low-temperature economizer; 17. a heat exchanger; 18. a condensation water tank; 19. a vacuum pump; 20. a condensate pump; 21. returning cooling water; 22. cooling water; 23. emptying; 24. recycling the condensed water; 25. hot flue gases; 26. hot flue gases; 27. desulfurized wastewater (from filtrate tank);
91. a primary heater; 92. a dual-effect heater; 93. a triple effect heater; 131. a one-effect flash evaporator; 132. a two-effect flash evaporator; 133. a triple effect flash evaporator; 270. a feed pump; 120. a sludge discharge pump; 30. a vacuum pump; 31. a drain tank; 17. a heat exchanger.
Detailed Description
The present invention will now be described in order to more clearly understand the technical features, objects, and effects of the present invention.
A factory is planned with a total installed capacity of 1920 MW. Wherein, the stage I engineering 2X 300MW unit adopts a circulating fluidized bed boiler with natural circulation as a main unit and adopts a direct air-cooling steam extraction type steam turbine generator unit; the second stage of the extension project is a 2 multiplied by 660MW high-efficiency ultra-supercritical coal-fired air cooling unit, and a flue gas desulfurization and denitration facility is synchronously constructed in a matched manner. The deslagging of the whole plant adopts a mechanical deslagging system and a dry deslagging process, the ash removal system adopts a cloth bag dedusting and dry ash removal process, and the desulfurization process adopts a limestone-gypsum wet flue gas desulfurization system and a one-furnace one-tower desulfurization device.
A2X 300MW unit boiler of the project at the I stage is provided with a low-temperature economizer, the smoke temperature at the inlet of the air preheater is 370 ℃, the smoke temperature at the inlet of the electric dust collector passes through the low-temperature economizer at 120 ℃, the smoke temperature at the inlet of the electric dust collector does not pass through the low-temperature economizer at 155 ℃, the smoke temperature at the inlet of the desulfurizing tower is 90 ℃, and the smoke temperature at the outlet is 50 ℃.
And (3) wet desulphurization is adopted for the flue gas of the boiler in the I stage and the II stage, the industrial water in a factory area, the high-salt-content drainage of a boiler make-up water treatment system and the qualified industrial wastewater are treated, the desulfurization wastewater quantity of the 2 x 300MW unit in the I stage engineering is 8t/h, the desulfurization wastewater quantity in the II stage is 14t/h, and the total amount is 22 t/h. The main components of the desulfurized wastewater are shown in Table 2.
TABLE 2 desulfurized Water quality
Figure BDA0002913391870000041
The flow rate of the desulfurization wastewater of the engineering boiler in the I and II stages is 22t/h, a pretreatment system is not needed for the desulfurization wastewater, the desulfurization wastewater is preheated by directly utilizing the heat of a low-temperature economizer, then the desulfurization wastewater is concentrated by triple effect flash evaporation, the concentration rate can reach 90 percent, the online concentration is automatically adjusted by 50 to 90 percent, about 2.2t/h of concentrated solution after the desulfurization wastewater is concentrated enters two unit spray dryers respectively for evaporation and drying, the amount of the dried concentrated solution of each boiler is 1.1t/h, the generated dust and water vapor are introduced into a flue before electric precipitation along with flue gas, the chlorine ions and other solid particles and metal elements are captured by the aid of electricity during the dust removal, and the evaporated water vapor enters a desulfurization tower. The water vapor generated in the flash evaporation concentration process can be recovered to the desulfurization process water or water supplement with other purposes after condensation.
After the desulfurization wastewater is treated by the technologies of flash evaporation concentration and concentrated solution drying, water is evaporated and condensed for 90% recycling, the rest of water enters a desulfurization tower in a steam form and is absorbed by the desulfurization tower, the recovery rate of the water is 100%, and the generated solid particles are completely removed in a dust form through electric precipitation, so that the real zero emission of no waste gas, no wastewater and no waste solid discharge in the desulfurization wastewater treatment is realized.
The technical scheme is provided with a double-row flash evaporation concentration system, and concentrated solution is conveyed to spray drying systems arranged at the tail parts of two boilers for drying.
The invention mainly comprises two stages: one is a flash concentration stage, as shown in fig. 1 and 2; the other is a subsequent concentrate drying stage, as shown in fig. 1. Specifically, the overall work flow of the invention is as follows:
the desulfurization wastewater 27 (from a filtrate water tank) with the wastewater flow rate of 22t/h enters a multi-effect flash evaporator 13 through an evaporation circulating pump 14, is subjected to triple-effect flash concentration, the concentration rate can reach 90%, and is automatically adjustable in an online 50% -90%, about 2.2t/h of concentrated solution 11 after the desulfurization wastewater is concentrated enters a spray dryer 7 through a thickener 12 for evaporation drying (for example, the concentrated solution enters two unit spray dryers for evaporation drying, the amount of the dried concentrated solution of each boiler is 1.1t/h), the generated dust and water vapor are introduced into a flue 8 along with flue gas, for example, the flue before electric precipitation, chloride ions and other solid particles and metal elements are captured by electric precipitation, and the evaporated water vapor enters a desulfurization tower. The water vapor generated in the flash evaporation concentration process can be recovered to the desulfurization process water or water supplement with other purposes after condensation.
The hot flue gas 25 and the hot flue gas 26 exchange heat in the low-temperature economizer 16, the multi-effect flash evaporator 13 is respectively connected with the low-temperature economizer 16 and the circulating pump 15 to realize heat exchange, and the desulfurization wastewater 27 is directly preheated by using the heat of the low-temperature economizer 16 without a pretreatment system.
Water vapor is generated in the flash evaporation concentration process, and cooling water return water 21 is formed after heat exchange and condensation of the heat exchanger 17 and can be recycled to desulfurization process water or water supplement for other purposes. In addition, the water vapor generated in the flash evaporation concentration process can enter a condensation water tank 18 after heat exchange and condensation of a heat exchanger 17, and then passes through a vacuum pump 19 and evacuation 23; the condensate water can also be recycled 24 by the condensate pump 20; wherein, the cooling water 22 can exchange heat through the heat exchanger 17; the cooling water return 21 enters the condensation water tank 18.
As shown in fig. 1, the working flow of the concentrate drying stage is as follows:
the concentrated solution 11 enters a spray dryer 7 through a thickener 12 and a feed pump 10 for evaporation drying, compressed air 9 is introduced into the spray dryer 7, the generated dust and water vapor are introduced into a flue 8 along with flue gas, for example, the flue is introduced into a flue before electric precipitation, chloride ions and other solid particles and metal elements are captured by electric precipitation, and the evaporated water vapor enters a desulfurizing tower. Dust removal and ash removal is performed by means of dust removal means 80 in the dust separator 4 and the flue 8.
In addition, a denitration device 2 and an air preheater 3 are arranged in the coal-fired boiler 1, the coal-fired boiler 1 is connected with a dust remover 4, the coal-fired boiler 1 is also connected with a pipe type dust remover 5 and a fan 6, the fan 6 is connected with a spray dryer 7, and the pipe type dust remover 5 is connected with a flue 8 so as to realize dust removal.
As shown in fig. 1 and fig. 2, the specific working process of the flash evaporation concentration stage is as follows:
the desulfurized waste water 27 (from the filtrate tank) is concentrated by evaporation by triple effect flash evaporation. The multi-effect flash evaporator specifically includes, for example, a one-effect flash evaporator 131, a two-effect flash evaporator 132, and a three-effect flash evaporator 133.
The desulfurization wastewater 27 sequentially enters a first-effect flash evaporator 131, a second-effect flash evaporator 132 and a third-effect flash evaporator 133 through a feeding pump 270 to realize third-effect flash evaporation, the first-effect flash evaporator 131 is connected with a first-effect heater 91 through an evaporation circulating pump 14, the second-effect flash evaporator 132 is connected with a second-effect heater 92 through the evaporation circulating pump 14, and the third-effect flash evaporator 133 is connected with a third-effect heater 93 through the evaporation circulating pump 14. The desulfurization wastewater 27 enters a thickener 12 after triple effect flash evaporation, and forms a desulfurization wastewater concentrated solution 11 through a dredge pump 120;
wherein, a part of the water vapor from the triple effect flash evaporator 133 and the thickener 12 passes through the heat exchanger 17 to form cooling water return 21, the other part of the water vapor enters the condensation water tank 18 after passing through the heat exchanger 17 for heat exchange, and the condensation water tank 18 is connected with a vacuum pump 19. The condensate tank 18 is connected to a condensate pump 20 for realizing condensate recycling 24. The cooling water 22 exchanges heat in the heat exchanger 17.
The first effect heater 91 is connected to the drain tank 31, the drain tank 31 stores the recovered condensed water, and is connected to the vacuum pump 30, and the drain tank 31 is connected to the low-temperature economizer 16 through the circulation pump 15. The hot flue gas 25 enters the low-temperature economizer 16, and after heat exchange, the hot flue gas 26 leaves the low-temperature economizer 16.
The invention has the following advantages:
1. really realizing zero discharge of wastewater
The desulfurization wastewater is subjected to triple-effect flash concentration by adopting a flash concentration and concentrated solution drying technology, and then is dried by a spray drying system and sent to electric precipitation for capture. The evaporated clean water is recycled, and the real zero discharge of no waste water, no waste gas and no waste solid after the waste water treatment is realized.
2. Low operation cost
The technical process does not need a three-header pretreatment system, so that on one hand, the high medicament cost and the operation cost are reduced, on the other hand, the generation of high-salt mud cakes is avoided, and the recontamination of the added medicament to the wastewater is reduced; the tail flue gas waste heat is used for heating, and no steam is consumed; the flash evaporation concentration technology has a simple system and high automation degree, and does not need to increase operation and maintenance personnel; no medicine is needed after the operation; no consumption material, only the consumption of electricity cost, and the cost of water treatment per ton is less than 10 yuan. The highest recovery of high-quality water can reach 95 percent, and the water cost can be saved.
3. Energy saving and consumption reduction by using waste heat at tail of flue
The triple-effect flash evaporation concentration technology is adopted, so that the energy recycling is realized, and the utilization rate of the energy is improved. The desulfurization wastewater is heated by using the heat of the low-temperature economizer, no external steam is input in the whole evaporation process, and low energy consumption is realized.
4. High recovery rate of waste water and excellent quality of recovered water
After the desulfurization wastewater is subjected to evaporation treatment, the maximum wastewater recovery rate can reach 95%, and the concentration is continuously and automatically adjusted from 50% to 95%. After flash evaporation, the water obtained after evaporation and condensation of the desulfurization wastewater belongs to distilled product water and can be used for boiler water supplement.
5. The system is simple, small in maintenance amount and high in automation degree
The desulfurization wastewater flash evaporation concentration system adjusts the liquid level, concentration and temperature in the container by controlling the operation of the pump and the valve. By optimizing system control, remote monitoring, one-key starting and unattended operation can be realized. The main equipment of the system is a container and a pump, as long as the pump is subjected to routine maintenance.
6. The concentrated solution has high drying speed
Spray drying is flash drying, and the whole process from wet material to dry powder product is completed in only 20 s. The concentrated solution drying system has small volume, small occupied area and high heat efficiency.
7. The whole system can not be scaled
Because the technologies of low-temperature flash evaporation, calcium sulfate crystal seeds, high-speed circulation and the like are adopted, the salts in the desulfurization wastewater mainly exist in the forms of sulfate, chloride, sulfite, carbonate and gypsum, and the salts can not cause scaling in the evaporation process.
The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. In order that the components of the present invention may be combined without conflict, it is intended that all equivalent changes and modifications made by those skilled in the art without departing from the spirit and principles of the present invention shall fall within the protection scope of the present invention.

Claims (10)

1. The advanced treatment method for the wet desulphurization wastewater of the coal-fired boiler is characterized by comprising the following steps:
step A: carrying out flash evaporation concentration on the desulfurization wastewater from the coal-fired boiler to form a desulfurization wastewater concentrated solution;
and B: the concentrated solution of the desulfurization wastewater enters a spray dryer for evaporation and drying, dust and water vapor generated in the evaporation and drying process are introduced into a flue before electric precipitation along with flue gas, chloride ions, other solid particles and metal elements are captured by electric precipitation, and the evaporated water vapor enters a desulfurization tower.
2. The method for the advanced treatment of the wastewater generated by the wet desulphurization of the coal-fired boiler according to claim 1, wherein in the step A, the desulfurization wastewater is preheated by directly utilizing the heat of the low-temperature economizer without a pretreatment system.
3. The method for the advanced treatment of the wet desulphurization wastewater of the coal-fired boiler according to claim 1, wherein in the step A, the flash concentration adopts triple-effect flash concentration.
4. The method for the advanced treatment of the wet desulphurization wastewater of the coal-fired boiler according to claim 1, wherein in the step A, the liquid level, the concentration and the temperature in the container are adjusted by controlling the operation of the pump and the valve, so as to realize the flash evaporation concentration of the desulphurization wastewater.
5. The method for the advanced treatment of wastewater generated by wet desulfurization of coal-fired boiler according to claim 1, wherein in the step B, the number of the spray dryers is two, and the two spray dryers are arranged in parallel.
6. The advanced treatment system for the wet desulphurization wastewater of the coal-fired boiler is characterized in that the advanced treatment method for the wet desulphurization wastewater of the coal-fired boiler according to claim 1 is adopted, and comprises the following steps: a flash concentration system and a spray drying system connected to each other.
7. The advanced wastewater treatment system for wet desulfurization of coal-fired boiler according to claim 6, characterized in that the flash concentration system comprises: in series: first effect flash vessel, two effect flash vessel, three effect flash vessel, thickener and dredge pump, the concentrated system of flash distillation still includes: a cooling water return pipeline connected with the thickener and a condensation water tank connected with the cooling water return pipeline.
8. The advanced wastewater treatment system for wet desulfurization of coal-fired boiler according to claim 7, wherein a heat exchanger is provided between the cooling water return line and the condensate tank.
9. The advanced wastewater treatment system for wet desulfurization of coal-fired boiler according to claim 6, wherein the spray drying system comprises: the spray dryer and the electric dust removal front flue connected with the spray dryer are connected, and the electric dust removal front flue is connected with the desulfurizing tower.
10. The advanced wastewater treatment system for wet desulfurization of coal-fired boiler according to claim 6, wherein the number of spray dryers is two, and two of said spray dryers are disposed in parallel.
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