CN112607945A - Desulfurization wastewater zero-discharge system and method based on high-temperature and low-temperature flue gas coupling treatment - Google Patents
Desulfurization wastewater zero-discharge system and method based on high-temperature and low-temperature flue gas coupling treatment Download PDFInfo
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Abstract
本发明公开了一种基于高、低温烟气耦合处置的脱硫废水零排放系统及方法，系统包括沿介质流向依次连通的锅炉、脱硝反应器、空气预热器、烟气冷却器、除尘器、引风机以及脱硫塔，脱硫塔的脱硫废水出口连通有脱硫废水一体化处置装置；脱硫废水一体化处置装置包括连通的浓缩塔和干燥塔；浓缩塔上开设废水入口连通脱硫废水出口，浓缩塔开设蒸汽出口并连通脱硫塔的烟气入口，浓缩塔开设烟气入口连通除尘器出口，干燥塔开设烟气入口连通脱硝反应器的出口，干燥塔开设飞灰出口连通除尘器的入口；采用低温余热烟气浓缩、高温烟气干燥结晶的一体化工艺在充分利用电厂余热的同时，充分利用除尘器和脱硫塔现有装备，兼顾了系统安全和成本，实现脱硫废水零排放。
The invention discloses a system and method for zero discharge of desulfurization wastewater based on the coupled treatment of high and low temperature flue gas. The system includes a boiler, a denitration reactor, an air preheater, a flue gas cooler, a dust collector, The induced draft fan and the desulfurization tower, the desulfurization wastewater outlet of the desulfurization tower is connected with the desulfurization wastewater integrated treatment device; the desulfurization wastewater integrated treatment device includes the connected concentration tower and the drying tower; the wastewater inlet is connected to the desulfurization wastewater outlet, and the concentration tower is opened. The steam outlet is connected to the flue gas inlet of the desulfurization tower, the flue gas inlet of the concentration tower is connected to the outlet of the dust collector, the flue gas inlet of the drying tower is connected to the outlet of the denitration reactor, and the fly ash outlet of the drying tower is connected to the inlet of the dust collector; low temperature waste heat is used. The integrated process of flue gas concentration and high-temperature flue gas drying and crystallization not only makes full use of the waste heat of the power plant, but also makes full use of the existing equipment of dust collectors and desulfurization towers, taking into account system safety and cost, and realizing zero discharge of desulfurization wastewater.
Description
Technical Field
The invention belongs to the technical field of desulfurization wastewater treatment, and particularly relates to a desulfurization wastewater zero-discharge system and method based on high-temperature and low-temperature flue gas coupling treatment.
Background
The wet desulfurizing technology is mainly adopted in coal-fired power stations and other coal-fired boilers, and the technology is characterized in that limestone/lime slurry and SO in coal-fired flue gas2Reacting to form gypsum (CaSO)4) Thereby reducing SO2And (4) discharging. The process has the advantages of mature technology, high desulfurization efficiency, simple operation, low operation cost and wide applicable coal quality; the disadvantage is that after desulfurization, part of the waste water is produced. With the continuous improvement of environmental standards, the problem of discharging desulfurization wastewater is gradually paid more attention, and some regions clearly require enterprises to reduce desulfurization wastewater and even realize zero discharge in factories.
The desulfurization wastewater zero-discharge technology generally comprises a chemical precipitation method, a membrane concentration method, evaporative crystallization, a flue injection method and the like. Wherein, the chemical precipitation method can generate secondary pollutants such as sludge, secondary waste liquid and the like, and the disposal cost is high. The membrane concentration method has higher automation degree, but the membrane is easy to be polluted and blocked and needs to be replaced regularly, so the operation cost is high and the popularization is difficult; the evaporative crystallization method consumes a large amount of heat, and the crystallized crystals have many impurities and are difficult to recycle, so that the problems of difficult stacking and difficult disposal exist; the flue injection method can better evaporate the desulfurization waste water into fine particles and mix the fine particles with smashed smoke dust, and the fine particles are finally recycled along with fly ash, but the continuous spraying of the desulfurization waste water into a flue gas air system can cause the continuous increase of the humidity of flue gas, so that equipment corrosion is easily caused finally, and the operation safety of the system is threatened.
In conclusion, the existing desulfurization wastewater zero-discharge treatment technology has advantages and disadvantages, and the economical efficiency, safety and environmental protection can not be fully considered. Therefore, it is urgent to find a safe, efficient and inexpensive zero-discharge process for desulfurization waste water.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a desulfurization wastewater zero-discharge system and method based on high-temperature and low-temperature flue gas coupling treatment, which are safe, efficient and low in treatment cost.
The first purpose of the invention is implemented by the following technical scheme: a desulfurization wastewater zero-discharge system based on high-temperature and low-temperature flue gas coupling treatment comprises a boiler, a denitration reactor, an air preheater, a flue gas cooler, a dust remover, an induced draft fan and a desulfurization tower which are sequentially communicated along the flow direction of a medium, wherein a desulfurization wastewater outlet of the desulfurization tower is communicated with a desulfurization wastewater integrated treatment device; a pH value adjusting port is arranged in front of an inlet of the desulfurization wastewater integrated treatment device; the desulfurization wastewater integrated treatment device comprises a concentration tower and a drying tower which are communicated in sequence; the concentration tower is provided with a wastewater inlet communicated with a desulfurization wastewater outlet of the desulfurization tower, the concentration tower is provided with a steam outlet and communicated with a flue gas inlet of the desulfurization tower, the concentration tower is provided with a flue gas inlet communicated with an outlet of the dust remover, the drying tower is provided with a flue gas inlet communicated with an outlet of the denitration reactor, and the drying tower is provided with a fly ash outlet communicated with an inlet of the dust remover.
A desulfurization waste water delivery pump is arranged between the desulfurization waste water outlet of the desulfurization tower and the waste water inlet of the concentration tower; a booster fan is arranged between the outlet of the dust remover and the flue gas inlet of the concentration tower; a slurry conveying pump is arranged between a concentrated solution outlet of the concentrating tower and a concentrated solution inlet of the drying tower; and a pneumatic conveying pump is arranged between the fly ash outlet of the drying tower and the inlet of the dust remover.
And a concentrated solution slurry circulating pipeline is arranged on the concentrating tower, an outlet and an inlet of the concentrated solution slurry circulating pipeline are respectively positioned at the lower part and the upper part of the concentrating tower, and a second slurry circulating pump is arranged on the concentrated solution slurry circulating pipeline.
The desulfurization waste water integrated treatment device is provided with a desulfurization waste water inlet, a low-temperature flue gas inlet, a saturated steam outlet, a high-temperature flue gas inlet and a crystallized fly ash outlet, and the waste water inlet at the middle lower part of one side of the concentration tower is communicated with the desulfurization waste water outlet of the desulfurization tower through the desulfurization waste water inlet; the low-temperature flue gas inlet is sequentially communicated with a booster fan and a flue gas inlet in the middle of the concentration tower, a steam outlet at the top of the concentration tower is communicated with the desulfurization tower through a saturated steam outlet, the upper part of the drying tower is provided with a flue gas inlet, and the flue gas inlet is communicated with an outlet of the denitration reactor through a high-temperature flue gas inlet; the bottom of the drying tower is provided with a fly ash outlet which is communicated with the inlet of the dust remover through a crystallized fly ash outlet.
The flue at the outlet of the denitration reactor is divided into two paths, wherein one path is communicated with the flue gas inlet of the drying tower; the other path is communicated with an air preheater; the flue at the outlet of the dust remover is divided into two paths, wherein one path is communicated with the flue gas inlet of the concentration tower, and the other path is communicated with the inlet of the induced draft fan.
And flue gas flow monitoring devices are arranged at the flue gas inlet of the drying tower and the flue gas inlet of the concentration tower.
A cooling device is arranged on the path from the fly ash outlet of the drying tower to the inlet of the dust remover.
The second purpose of the invention is to provide a desulfurization wastewater zero-discharge method based on high-temperature and low-temperature flue gas coupling treatment, which comprises the following steps:
the desulfurization waste water enters a concentration tower after the pH value is adjusted, concentrated solution generated in the concentration tower is conveyed to a drying tower, low-temperature flue gas at the outlet of a dust remover enters the concentration tower to heat the waste water to be desulfurized, saturated steam generated in the concentration tower enters the desulfurization tower for reuse, the concentrated solution exchanges heat with high-temperature flue gas from a denitration reactor in the drying tower, is dried and crushed to form crystallized fly ash, and the crystallized fly ash is conveyed to the dust remover to be collected and discharged;
the concentration heat source adopts low-temperature flue gas after a dust remover, and the drying and conveying heat/gas source adopts high-temperature flue gas before an air preheater.
The crystallized fly ash enters the dust remover from a flue between the flue gas cooler and the dust remover; when the crystallized fly ash is reinjected to a flue between the flue gas cooler and the dust remover, the reinjection temperature of the crystallized fly ash is consistent with the temperature of the original flue gas in the flue.
The pH value of the desulfurization wastewater entering the desulfurization tower is 7-8.
Compared with the prior art, the invention has at least the following beneficial effects:
the boiler, the denitration reactor, the air preheater, the flue gas cooler, the dust remover, the draught fan and the desulfurization tower are sequentially communicated along the medium flow direction, the desulfurization wastewater enters the concentration tower of the desulfurization wastewater integrated disposal device, and the pH value of the desulfurization wastewater can be adjusted through the pH value adjusting port; the high-temperature flue gas after denitration can be introduced into the drying tower to dry the concentrated solution after concentration, the heat of the high-temperature flue gas is fully utilized, meanwhile, the low-temperature flue gas from the dust remover enters the concentration tower to provide a low-temperature heat source for concentration, and the generated saturated steam returns to the desulfurization tower;
the concentration part based on low-temperature flue gas adopts the waste heat flue gas after the dust remover, the waste heat energy of the power plant is fully utilized, and the method has the advantages of simple equipment, energy conservation of the system and low operation cost;
the invention is based on the drying and conveying part of the high-temperature flue gas, and has the advantages of fast concentration and drying, large processing capacity, small equipment volume and the like;
according to the invention, the pH value adjusting port is additionally arranged before the concentration of the desulfurization wastewater, so that the generation of acidic gas in the concentration and drying processes can be greatly reduced, and the risks of equipment corrosion and waste gas emission are further reduced;
saturated steam generated by the concentration part is directly discharged into a front flue of the desulfurizing tower, so that the consumption of make-up water of the desulfurizing tower is reduced while zero discharge is realized, and the operation cost is further reduced;
all the treated crystallized fly ash is reinjected to the dust remover and finally stacked and recycled together with ash slag of the dust remover, so that the problem of zero emission of waste is fundamentally solved;
the system has the advantages of simple equipment, mature technology, high integration degree, low investment and good economical efficiency, and utilizes the original flue gas treatment equipment of the coal-fired boiler to the maximum extent.
Furthermore, a concentrated solution slurry circulating pipeline is arranged on the concentrating tower, and a part of concentrated solution can enter the concentrating tower for recycling without supplementing additional water sources.
In the technical scheme, based on the method, the low-temperature flue gas after the dust remover is used as a concentrated heat source, and the high-temperature flue gas before the air preheater is used as a drying and conveying heat/gas source; saturated steam generated by concentration is reinjected to a front flue of the desulfurizing tower so as to reduce water supplement of a desulfurizing system; the crystallized fly ash is directly conveyed to a flue between the flue gas cooler and the dust remover, and is finally collected and discharged from the dust remover, so that the comprehensive zero emission of system waste water, waste gas and waste residue is realized.
Furthermore, when the crystallized fly ash is reinjected to a flue between the flue gas cooler and the dust remover, the reinjection temperature of the crystallized fly ash is consistent with the temperature of the original flue gas in the flue, and the influence on the original flue gas air system is reduced to the minimum.
Furthermore, a regulator is injected through the pH value adjusting port, so that the pH value of the desulfurization slurry is stabilized between 7 and 8 when the desulfurization slurry enters the desulfurization wastewater integrated treatment device, and the acid corrosion of subsequent equipment is avoided.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
FIG. 2 is a schematic view of an integrated desulfurization wastewater treatment device.
FIG. 3 is a schematic view of a conventional desulfurization waste water disposal system.
FIG. 4 is a schematic diagram of a flue desulfurization wastewater injection technique.
In the figure: 1-boiler, 2-denitration reactor, 3-air preheater, 4-flue gas cooler, 5-dust remover, 6-induced draft fan, 7-desulfurizing tower, 8-chimney, 9-desulfurization waste water integrated treatment device, 10-pH value regulating port, 11-high temperature flue gas, 12-low temperature flue gas, 13-desulfurization waste water, 14-saturated steam, 15-crystallization fly ash, 16-triple box pretreatment system, 17-membrane concentration system, 18-drying crystallization system, treated sludge, 20-osmotic water, 21-crystallized salt, 22-flue sprayer, 9.1-concentration tower, 9.2-drying tower, 9.3-desulfurization waste water delivery pump, 9.4-booster fan, 9.5-slurry circulating pump, 9.6-slurry delivery pump, 9.7-pneumatic conveying pump, 9.8-inlet of desulfurized waste water, 9.9-inlet of low-temperature flue gas, 9.10-outlet of saturated steam, 9.11-outlet of high-temperature flue gas and 9.12-outlet of crystallized fly ash.
Detailed Description
The embodiments of the present invention will be described in detail with reference to the accompanying drawings, but they are not to be construed as limiting the invention, and are merely illustrative, and the advantages of the invention will be more clearly understood and appreciated by those skilled in the art.
Referring to FIG. 1: the invention relates to a desulfurization wastewater zero-discharge system based on high-temperature and low-temperature flue gas coupling treatment, which comprises a boiler 1, a denitration reactor 2, an air preheater 3, a flue gas cooler 4, a dust remover 5, an induced draft fan 6, a desulfurization tower 7 and a chimney 8 which are sequentially communicated along the flow direction of a medium; a desulfurization water outlet of the desulfurization tower 7 is communicated with a desulfurization wastewater integrated treatment device 9, and a pH value adjusting port 10 is arranged at an inlet of the desulfurization wastewater integrated treatment device 9 or at a desulfurization water outlet of the desulfurization tower 7;
referring to FIG. 2: the desulfurization waste water integrated treatment device 9 is provided with a desulfurization waste water inlet 9.8, a low-temperature flue gas inlet 9.9, a saturated steam outlet 9.10, a high-temperature flue gas inlet 9.11 and a crystallized fly ash outlet 9.12, and a waste water inlet at the middle lower part of one side of the concentration tower 9.1 is communicated with a desulfurization waste water outlet of the desulfurization tower 7 through the desulfurization waste water inlet 9.8; the low-temperature flue gas inlet 9.9 is communicated with a booster fan 9.4 and a flue gas inlet in the middle of the concentration tower 9.1 in sequence, a steam outlet at the top of the concentration tower 9.1 is communicated with the desulfurization tower 7 through a saturated steam outlet 9.10, a flue gas inlet is formed in the upper part of the drying tower 9.2, and the flue gas inlet is communicated with an outlet of the denitration reactor 2 through a high-temperature flue gas inlet 9.11; the bottom of the drying tower 9.2 is provided with a fly ash outlet which is communicated with the inlet of the dust remover 5 through a crystallized fly ash outlet 9.12.
Referring to fig. 1 and 2: the denitration reactor comprises a boiler 1, a denitration reactor 2, an air preheater 3, a flue gas cooler 4, a dust remover 5, an induced draft fan 6, a desulfurizing tower 7 and a chimney 8 which are connected in sequence through a flue; a flue gas pipeline at the outlet of the denitration reactor 2 and the high-temperature flue gas 11 are divided into two parts, namely a first high-temperature flue gas pipeline 11.1 and a second high-temperature flue gas pipeline 11.2, the first high-temperature flue gas pipeline 11.1 is connected with an air preheater 3, and one path of high-temperature flue gas enters the air preheater 3; the second high-temperature flue gas pipeline 11.2 is connected with the high-temperature flue gas inlet 9.11; the other path of high-temperature flue gas 11.2 enters a desulfurization wastewater integrated treatment device 9; the flue gas pipeline at the outlet of the dust remover 5 and the low-temperature flue gas 12 are divided into two parts, a first low-temperature flue gas pipeline 12.1 is connected with the induced draft fan 6, the other second low-temperature flue gas pipeline 12.2 is connected with a low-temperature flue gas inlet 9.9, the other low-temperature flue gas enters the integrated treatment device 9 for the desulfurization wastewater, a waste liquid outlet at the bottom of the desulfurization tower 7 is connected with the inlet 9.8 for the desulfurization wastewater, a saturated steam outlet 9.10 is connected with a flue in front of the desulfurization tower 7 through a pipeline, and a crystallized fly ash outlet 9.10 is connected with the flue between the flue gas cooler 4 and the dust remover 5 through pipelines.
The integrated desulfurization waste water treatment device 9 is characterized in that a desulfurization waste water inlet 9.8 is connected with an inlet at the middle lower part of one side of a concentration tower 9.1, a low-temperature flue gas inlet 9.9 is sequentially communicated with a booster fan 9.4 and an inlet at the middle part of the concentration tower 9.1, a saturated steam outlet 9.10 is connected with a steam outlet at the top of the concentration tower 9.1, a high-temperature flue gas inlet 9.11 is communicated with an opening at the upper part of a drying tower 9.2 through a pipeline, and a crystallization fly ash outlet 9.12 is communicated with an interface at the bottom of the drying tower 9.2 through a.
Referring to FIG. 1: the concentrated heat source adopts low-temperature flue gas dedusted by a deduster 5, so that the waste heat of the flue gas of the coal-fired power plant is fully utilized to save cost; the drying and conveying hot gas source adopts high-temperature flue gas 11.2 at the outlet of the denitration reactor 2, taking a coal-fired power plant as an example, the flue gas temperature can reach 350-370 ℃, and the arrangement can greatly improve the heat exchange end difference, improve the heat exchange efficiency and reduce the equipment volume.
Referring to fig. 1: when the crystallized fly ash 15 is reinjected to the flue between the flue gas cooler 4 and the dust remover 5, the reinjection temperature is consistent with the original flue gas temperature in the flue, and the influence on the original flue gas and air system is reduced to the minimum.
Referring to fig. 1: and a regulator is injected through the pH value adjusting port 10, so that the pH value of the desulfurization slurry 13 is stabilized between 7 and 8 when the desulfurization slurry enters the desulfurization wastewater integrated treatment device 9, and the acidic corrosion of subsequent equipment is avoided.
Referring to fig. 3, the conventional desulfurization wastewater zero-discharge process is divided into 3 steps: 1 pretreatment, 2 concentration and 3 crystallization. The pretreatment module 16 comprises dosing, neutralization, sedimentation and flocculation, the concentration module 17 can adopt membrane concentration, multi-effect evaporation concentration, steam mechanical recompression concentration or low-temperature flash evaporation, and the crystallization module 18 can adopt evaporation crystallization or spray drying crystallization. The pretreatment module 16 generates sludge 19 in the treatment process, the concentration module 17 generates condensed water 20 in the treatment process, and the final product of the drying module 18 is mixed crystal salt 21.
Referring to fig. 1 and 2 and fig. 3: according to the desulfurization wastewater zero-discharge system based on high-temperature and low-temperature flue gas coupling treatment, saturated steam 14 generated by concentration is injected back to the front flue of the inlet of a desulfurization tower, so that the make-up water of the desulfurization system is reduced; the crystallized fly ash 15 is directly conveyed to a flue between the flue gas cooler 4 and the dust remover 5, and is finally collected and discharged from the dust remover 5, the blending proportion of the crystallized fly ash is calculated to be less than 5 percent of the total amount of the original fly ash, and the subsequent utilization of the ash residue is not influenced; compared with the conventional treatment process shown in the figure 3, the whole system of the invention has no waste water, waste gas and waste residue to be discharged, the ash and slag of the crystallized fly ash dust remover are uniformly mixed and have small mixing proportion, the comprehensive utilization standard of the ash and slag is met, and the design better solves the problems of stacking, secondary treatment and the like of the dried fly ash.
Referring to FIG. 4: in the prior art of zero emission, a simpler flue injection technology is adopted, and the desulfurization wastewater is directly injected into a front flue of a dust remover through an atomization injector 22. But the defects are that all water in the desulfurization wastewater enters the flue, and safety accidents such as overlarge humidity in the dust remover, electrode breakdown, overlarge ash humidity, insufficient fluidity, ash hopper blockage and the like are easily caused. Meanwhile, the atomizing and spraying system occupies a large area, and the flue conditions of part of projects cannot be improved by adopting the technology.
Referring to fig. 1 and fig. 2 and fig. 4: the invention relates to a desulfurization waste water zero discharge system based on high-temperature and low-temperature flue gas coupling treatment, wherein a large amount of saturated steam 14 is evaporated in a concentration section and returns to a desulfurization system for reuse, and a small amount of water is heated and evaporated by high-temperature flue gas and is injected back to a front flue of a dust remover together with crystallized fly ash 15. Compared with the flue injection technology of FIG. 4, the fly ash reinjected by the invention has low water content and has no safety influence on systems and equipment.
Referring to fig. 1 and fig. 2, the invention further includes a desulfurization wastewater zero-discharge method based on high-temperature and low-temperature flue gas coupling treatment, which includes the following steps;
firstly, starting a desulfurization waste water delivery pump 9.3, discharging desulfurization waste water 13 subjected to wet flue gas desulfurization from a desulfurization tower 7 to a desulfurization waste water inlet 9.8, and injecting a regulator into the system through a pH value regulating port 10 so that the pH value is stabilized between 7 and 8 to avoid corrosion of subsequent equipment.
Secondly, starting a slurry circulating pump 9.5, conveying the desulfurization-removed wastewater to the upper part of the desulfurization tower 9.1 to spray from top to bottom, exchanging heat with low-temperature flue gas 12 in the spraying process to evaporate and concentrate the desulfurization wastewater 13, introducing the concentrated saturated steam 14 into the desulfurization tower through a steam outlet 9.10, and conveying the concentrated solution to a drying tower 9.2 through a slurry conveying pump 9.6.
Thirdly, the concentrated solution exchanges heat with the high-temperature flue gas in a drying tower 9.2, is dried and crushed to form crystallized fly ash 15, and is conveyed to a flue between the flue gas cooler 4 and the dust remover 5.
And fourthly, in the process of the third step, cold air can be added into the crystallization fly ash outlet 9.12 or the total regulating system can be used for controlling the reinjection temperature of the crystallization fly ash 15 and ensuring that the reinjection temperature is consistent with the temperature of the original smoke gas in the flue.
The integrated treatment system for concentrating, drying and conveying the desulfurization wastewater based on the high-temperature flue gas is not limited to the specific forms of equipment such as the concentrator 9.1 and the drying crusher 9.2 in the system, and common technicians in the field can adopt a vertical type, a horizontal type, a rotary type and the like according to actual requirements, and only the corresponding functions of concentration, drying and crushing are required to be met.
The above-mentioned parts not described in detail are prior art.
Claims (10)
1. A desulfurization waste water zero discharge system based on high-temperature and low-temperature flue gas coupling disposal is characterized by comprising a boiler (1), a denitration reactor (2), an air preheater (3), a flue gas cooler (4), a dust remover (5), an induced draft fan (6) and a desulfurization tower (7) which are sequentially communicated along a medium flow direction, wherein a desulfurization waste water outlet of the desulfurization tower (7) is communicated with a desulfurization waste water integrated disposal device (9); a pH value adjusting port (10) is arranged in front of an inlet of the desulfurization wastewater integrated treatment device (9); the desulfurization wastewater integrated treatment device (9) comprises a concentration tower (9.1) and a drying tower (9.2) which are communicated; set up the waste water entry on concentrating tower (9.1), the desulfurization waste water export of waste water entry intercommunication desulfurizing tower (7), steam outlet and the flue gas entry of intercommunication desulfurizing tower are seted up in concentrating tower (9.1), the export of flue gas entry and intercommunication dust remover (5) is seted up in concentrating tower (9.1), the export of flue gas entry and intercommunication denitration reactor (2) is seted up in drying tower (9.2), fly ash export and the entry of intercommunication dust remover (5) are seted up in drying tower (9.2).
2. The desulfurization waste water zero-discharge system based on high-temperature and low-temperature flue gas coupling treatment of claim 1 is characterized in that a desulfurization waste water delivery pump (9.3) is arranged between a desulfurization waste water outlet of a desulfurization tower (7) and a waste water inlet of a concentration tower (9.1); a booster fan (9.4) is arranged between the outlet of the dust remover (5) and the flue gas inlet of the concentration tower (9.1); a slurry delivery pump (9.6) is arranged between the concentrated solution outlet of the concentrating tower (9.1) and the concentrated solution inlet of the drying tower (9.2); a pneumatic conveying pump (9.7) is arranged between the fly ash outlet of the drying tower (9.2) and the inlet of the dust remover (5).
3. The desulfurization waste water zero-discharge system based on high-temperature and low-temperature flue gas coupling treatment of claim 1, characterized in that a concentrated solution slurry circulation pipeline is arranged on the concentrating tower (9.1), an outlet and an inlet of the concentrated solution slurry circulation pipeline are respectively positioned at the lower part and the upper part of the concentrating tower (9.1), and a slurry circulation pump (9.5) is arranged on the concentrated solution slurry circulation pipeline.
4. The desulfurization waste water zero discharge system based on high-temperature and low-temperature flue gas coupling treatment is characterized in that the desulfurization waste water integrated treatment device (9) is provided with a desulfurization waste water inlet (9.8), a low-temperature flue gas inlet (9.9), a saturated steam outlet (9.10), a high-temperature flue gas inlet (9.11) and a crystallized fly ash outlet (9.12), and the waste water inlet at the middle lower part of one side of the concentration tower (9.1) is communicated with the desulfurization waste water outlet of the desulfurization tower (7) through the desulfurization waste water inlet (9.8); a low-temperature flue gas inlet (9.9) is communicated with a booster fan (9.4) and a flue gas inlet in the middle of the concentration tower (9.1) in sequence, a steam outlet at the top of the concentration tower (9.1) is communicated with a desulfurization tower (7) through a saturated steam outlet (9.10), a flue gas inlet is formed in the upper part of a drying tower (9.2), and the flue gas inlet is communicated with an outlet of a denitration reactor (2) through a high-temperature flue gas inlet (9.11); the bottom of the drying tower (9.2) is provided with a fly ash outlet which is communicated with the inlet of the dust remover (5) through a crystallized fly ash outlet (9.12).
5. The desulfurization wastewater zero-discharge system based on high-temperature and low-temperature flue gas coupling treatment as claimed in claim 1, characterized in that the flue at the outlet of the denitration reactor (2) is divided into two paths, wherein one path is communicated with the flue gas inlet of the drying tower (9.2); the other path is communicated with an air preheater (3); the flue at the outlet of the dust remover (5) is divided into two paths, wherein one path is communicated with the flue gas inlet of the concentration tower (9.1), and the other path is communicated with the inlet of the induced draft fan (6).
6. The desulfurization waste water zero discharge system based on high and low temperature flue gas coupling treatment of claim 1, characterized in that the flue gas inlet of the drying tower (9.2) and the flue gas inlet of the concentrating tower (9.1) are both provided with flue gas flow monitoring devices.
7. The desulfurization waste water zero discharge system based on high and low temperature flue gas coupling treatment of claim 1 is characterized in that a cooling device is arranged on the path from the fly ash outlet of the drying tower (9.2) to the inlet of the dust remover (5).
8. A method for treating desulfurization wastewater based on high-temperature and low-temperature flue gas coupling is characterized by comprising the following steps:
the method comprises the following steps that the desulfurization wastewater enters a concentration tower (9.1) after the pH value is adjusted, concentrated liquid generated in the concentration tower (9.1) is conveyed to a drying tower (9.2), low-temperature flue gas at the outlet of a dust remover (5) enters the concentration tower (9.1) to heat the wastewater to be desulfurized, saturated steam generated in the concentration tower (9.1) enters a desulfurization tower (7) for reuse, the concentrated liquid exchanges heat with high-temperature flue gas discharged from a denitration reactor (2) in the drying tower (9.2), is dried and crushed to form crystallized fly ash (15), and the crystallized fly ash (15) is conveyed to the dust remover (5) to be collected and discharged;
the concentration heat source adopts low-temperature flue gas (12.2) after the dust remover (5), and the drying and conveying heat/gas source adopts high-temperature flue gas (11.2) before the air preheater (3).
9. The method for desulfurizing waste water based on high-low temperature flue gas coupling treatment according to claim 8, characterized in that the crystallized fly ash (15) enters the dust remover (5) from the flue between the flue gas cooler (4) and the dust remover (5); when the crystallized fly ash (15) is reinjected to the flue between the flue gas cooler (4) and the dust remover (5), the reinjection temperature of the crystallized fly ash (15) is consistent with the temperature of the original flue gas in the flue.
10. The method for treating desulfurization waste water based on high-temperature and low-temperature flue gas coupling as recited in claim 8, characterized in that the pH value of the desulfurization waste water (13) entering the desulfurization tower (9.1) is 7-8.
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