CN210559895U - System for zero release of power plant's whole factory waste water and utilization - Google Patents
System for zero release of power plant's whole factory waste water and utilization Download PDFInfo
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- CN210559895U CN210559895U CN201920880870.0U CN201920880870U CN210559895U CN 210559895 U CN210559895 U CN 210559895U CN 201920880870 U CN201920880870 U CN 201920880870U CN 210559895 U CN210559895 U CN 210559895U
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Abstract
The utility model discloses a system of power plant's whole factory waste water zero release and utilization. The system for zero discharge of wastewater and resource utilization of the whole power plant comprises a circulating water sewage treatment system, a desulfurization wastewater treatment system and a crystallization salt making system. The utility model discloses a processing system has advantages such as high efficiency, reliable, economy. Use the utility model discloses a system treatment power plant's whole factory waste water has practiced thrift the medicament cost, has improved NaCl's purity and concentration, has reduced evaporation crystallization system's investment and cost. The method has the advantages that the zero discharge of the wastewater of the whole plant is realized, and simultaneously, the water, the calcium carbonate concentrated solution and the NaCl salt are recycled step by step, so that the zero discharge of the water and the resource utilization of the water and the solid waste are realized in a real sense.
Description
Technical Field
The utility model relates to a system of power plant's whole factory waste water zero release and utilization.
Background
The salt content of the desulfurization waste water of the power plant is 30000-60000mg/L, at present, the desulfurization waste water is comprehensively utilized by adopting systems such as a slag conveyor and the like, and the waste water has higher risks such as equipment corrosion and the like due to overhigh salt content. In order to ensure the safe operation of equipment, power plants are seeking other treatment ways for desulfurization wastewater. Through implementing the waste water zero release engineering of whole factory, realize the whole water structure optimization of whole factory and to the whole recycle of circulating water blowdown water, desulfurization waste water and other high salt waste water, will thoroughly solve the problem that the salt content of the outer waste water of power plant exceeds standard and the water potential safety hazard problem of desulfurization waste water at present.
The conventional power plant wastewater treatment process has high medicament cost and complex working procedures, and is difficult to completely realize zero discharge of wastewater, and finally the obtained salt is mixed salt and can only be used as hazardous waste landfill. Two sets of evaporative crystallization devices are required for salt separation, so that the investment and cost of the system are increased.
The implementation of the whole plant wastewater zero-discharge project has important practical significance in that the power plant can obtain good social benefits and environmental benefits and also can obtain certain economic benefits.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a system of whole factory waste water zero discharge of power plant and utilization, substep recovery water, calcium carbonate, NaCl crystal salt when realizing the waste water zero release of whole factory of power plant, realized the zero release of water and the utilization of solid useless resources in the true sense.
The utility model adopts the technical proposal that:
a system for zero discharge of wastewater and resource utilization of a whole plant of a power plant comprises a circulating water sewage treatment system, a desulfurization wastewater treatment system and a crystallization salt making system.
Furthermore, among this kind of system, circulating water blowdown water processing system includes the one-level flocculation and precipitation pond, second grade flocculation and precipitation pond, tertiary flocculation and precipitation pond, equalizing basin, multi-media filter, ozone catalytic oxidation tower, biological activity carbon filter, self-cleaning filter, ultrafiltration device, reverse osmosis unit, flocculation basin, micro-filtration device, sea water reverse osmosis unit that connect gradually through the pipeline.
Furthermore, among this kind of system, desulfurization effluent disposal system includes the retaining equalizing basin, one-level softening tank, tubular filtration membrane device, second grade softening clarification tank, tertiary softening clarification tank, multi-media filter, ozone advanced oxidation tower, activated carbon bed, ultrafiltration device, one-level nanofiltration device, second grade nanofiltration device, sea water reverse osmosis unit, homogeneous phase membrane ED (electrodialysis) device, decarbonization deamination device, buffer pool that connect gradually through the pipeline.
Furthermore, in the system, the crystallization salt preparation system comprises an evaporation crystallization device, a centrifugal dehydrator, a drying fluidized bed and a salt bin which are sequentially connected through pipelines.
Preferably, a concentrated water outlet of a seawater reverse osmosis device of the circulating water sewage treatment system is connected with a water storage regulating reservoir of the desulfurization wastewater treatment system; the buffer tank of the desulfurization wastewater treatment system is connected with the evaporative crystallization device of the crystallization salt production system; and sodium sulfate liquid outlets of the primary nanofiltration device and the secondary nanofiltration device in the desulfurization wastewater treatment system are respectively connected with a water storage regulating tank.
Preferably, in the system for zero discharge of wastewater and resource utilization of the whole power plant, the primary flocculation sedimentation tank and the primary softening tank are respectively connected with a lime feeding device; the secondary flocculation sedimentation tank and the secondary softening clarification tank are respectively connected with a flue gas pipe; the third-stage flocculation sedimentation tank and the third-stage softening clarification tank are respectively connected with a sodium carbonate feeding device.
Preferably, in the system for zero discharge and resource utilization of wastewater of the whole plant of the power plant, sludge outlets of the second-stage flocculation sedimentation tank, the third-stage flocculation sedimentation tank, the second-stage softening clarification tank and the third-stage softening clarification tank are respectively connected with a sludge concentration tank, and the sludge concentration tank is connected with a wet desulphurization system of the power plant.
Preferably, in the circulating water sewage treatment system, fresh water outlets of the reverse osmosis device and the seawater reverse osmosis device are respectively connected with a fresh water comprehensive recycling system; a concentrated water outlet of the reverse osmosis device is connected with a water inlet of the flocculation tank; the water inlet of the reverse osmosis device is connected with the fresh water outlet of the ultrafiltration device.
Preferably, in the circulating water sewage treatment system, concentrated water outlets of the multi-medium filter, the biological activated carbon filter, the self-cleaning filter and the ultrafiltration device are respectively connected with a water inlet of the three-stage flocculation sedimentation tank.
Preferably, in the circulating water sewage treatment system, the sludge outlet of the primary flocculation sedimentation tank is also connected with a concentration tank, and the concentration tank is connected with a dehydrator.
Preferably, in the circulating water sewage treatment system, the flocculation tank is connected with a double-alkali adding device, and the double alkali is sodium hydroxide and calcium hydroxide.
Preferably, in the desulfurization wastewater treatment system, a water inlet of the primary nanofiltration device is connected with a fresh water outlet of the ultrafiltration device; the fresh water outlet of the first-stage nanofiltration device is connected with the water inlet of the second-stage nanofiltration device.
Preferably, in the desulfurization wastewater treatment system, a water inlet of the seawater reverse osmosis device is connected with a fresh water outlet of the secondary nanofiltration device; a fresh water outlet of the seawater reverse osmosis device is connected with an industrial water system; the concentrated water outlet of the seawater reverse osmosis device is connected with the water inlet of the homogeneous membrane ED device.
Preferably, in the desulfurization wastewater treatment system, a fresh water outlet of the homogeneous membrane ED device is connected with a water inlet of a reverse osmosis device in the circulating water sewage treatment system, and a concentrated water outlet of the homogeneous membrane ED device is connected with a water inlet of the decarburization deamination device.
Preferably, in the desulfurization wastewater treatment system, concentrated water outlets of the multi-media filter, the activated carbon bed and the ultrafiltration device are respectively connected with a water inlet of the three-stage softening clarification tank.
Preferably, in the desulfurization wastewater treatment system, the sludge in the primary softening tank is collected, conveyed to a dehydrator, dewatered and transported to an outside; the effluent of the dehydrator flows back to the water storage adjusting tank.
Preferably, among the desulfurization wastewater treatment system, decarbonization deamination device still is connected with overhauls reserve pond, overhauls reserve pond and is connected with the evaporation crystallization device of crystallization salt manufacturing system.
Preferably, in the crystallization salt production system, a fresh water outlet of the evaporative crystallization device is connected with a water inlet of a reverse osmosis device in the circulating water sewage treatment system.
Preferably, in the salt-making crystallization system, the evaporative crystallization device is a multiple-effect evaporation device, a single-effect evaporation device, an MVR (mechanical vapor recompression) evaporation device or a TVR (thermal vapor recompression) evaporation device.
Preferably, in the crystallization salt manufacturing system, the evaporation crystallization device is also connected with a slag dragging system.
Preferably, in the crystallization salt-making system, the effluent of the centrifugal dehydrator is refluxed to the evaporation crystallization device.
The main problem of the circulating water sewage is that the salt content is high, and if the circulating water sewage is used as circulating water supplement water, the salt content of the circulating water sewage needs to be reduced. Consequently the utility model discloses a reverse osmosis technology for processing system is as desalination technique, and reverse osmosis membrane device goes out water quality of water is fine, has not only removed the inorganic salt of the overwhelming majority, has also got rid of all kinds of organic pollutants, colloid, silica, virus, bacterium etc. and has very high clearance to various impurity in the aquatic moreover, therefore reverse osmosis membrane goes out water quality of water and can reach high standard water quality of water index, and reverse osmosis membrane goes out water and is fit for high-end water needs, improves the value of utilization of water resource. The key to reverse osmosis desalination system design is the choice of pretreatment. By adopting a reverse osmosis desalination process, incoming water is pretreated, and after three-stage softening, flocculating and precipitating treatment, substances such as magnesium, sulfate radicals, fluorine, heavy metals, suspended matters and the like in wastewater are removed. After the filtration treatment, the desalination treatment is carried out by first-stage reverse osmosis and seawater reverse osmosis. And (4) conveying the reverse osmosis effluent to a comprehensive recycling system, and allowing the seawater reverse osmosis concentrated water to enter a desulfurization wastewater treatment system.
Aiming at the characteristics of high salt content, high hardness, serious organic pollution, complex components and the like of the desulfurization wastewater, a three-stage softening reaction is adopted to remove substances such as magnesium, sulfate radicals, heavy metals and the like. Organic matters in the wastewater are removed through ozone advanced oxidation. Calcium, magnesium, sulfate radicals and the like in the wastewater are further removed from the ultrafiltration effluent through two-stage nanofiltration, the effluent subjected to the second-stage nanofiltration mainly contains NaCl, and then the desulfurization wastewater is subjected to decrement concentration and salt separation through a seawater reverse osmosis and homogeneous membrane ED device. And the high-salt concentrated solution is subjected to decarburization and deamination treatment and then passes through an evaporative crystallization device to finally form high-purity sodium chloride crystal salt which is used as a chemical raw material for resource utilization. The fresh water of the homogeneous membrane ED device is mainly inorganic salt and organic pollutants, the salt concentration is about 1%, and the fresh water flows back to the reverse osmosis device of the circulating water sewage treatment system for cooperative treatment. The main component of the nanofiltration concentrated water is sodium sulfate, and the nanofiltration concentrated water returns to a water storage adjusting tank of the desulfurization wastewater treatment system and is removed through flocculation precipitation.
The utility model has the advantages that:
the utility model discloses a processing system has advantages such as high efficiency, reliable, economy. Use the utility model discloses a system treatment power plant waste water of making perfect factory, the flue gas after the desulfurization of softening part power plant replaces partial sodium carbonate, makes the pharmaceutical cost practice thrift about 75%. Meanwhile, 60-70% of sulfate radicals can be removed from the softened part, the purity and concentration of NaCl are further improved after the NaCl is treated by subsequent nanofiltration and ED devices, and the investment and cost of an evaporative crystallization system are reduced. The calcium carbonate precipitate generated in the softening process can be reused in a wet desulphurization system in the power plant. The sodium sulfate salt obtained from the nanofiltration of the concentrated water is also treated by flocculation precipitation. The method has the advantages that the zero discharge of the wastewater of the whole plant is realized, and simultaneously, the water, the calcium carbonate concentrated solution and the NaCl salt are recycled step by step, so that the zero discharge of the water and the resource utilization of the water and the solid waste are realized in a real sense.
The utility model discloses a concrete advantage as follows:
(1) lime is added into the wastewater in the first-stage softening flocculation precipitation step to remove substances such as magnesium, sulfate radicals, fluorine, heavy metals and the like, so that the content of the sulfate radicals in the water is reduced. Flue gas is added in the second-stage flocculation precipitation, so that the adding amount of sodium carbonate in the subsequent third-stage softening is reduced, and the operation cost of a softening and clarifying unit is reduced.
(2) The three-stage softening and clarifying device further removes suspended matters, hardness and the like in the wastewater, simultaneously realizes resource recovery of calcium carbonate, reduces adverse effects of calcium, magnesium and the like on subsequent devices, and the calcium carbonate separated in the step can be reused in a wet desulphurization system in a power plant.
(3) The desulfurization wastewater advanced treatment system realizes concentration of salinity and reduction of wastewater by jointly using two-stage nanofiltration, seawater reverse osmosis and homogeneous membrane ED devices, greatly reduces the content of sodium sulfate in high-salt concentrated solution, improves the purity of sodium chloride, simplifies an evaporative crystallization system, and saves investment and cost of the system.
(4) The sodium sulfate is treated by flocculation and precipitation, so that zero emission is realized.
Drawings
FIG. 1 is a schematic diagram of the system for zero discharge of wastewater and resource utilization in a whole plant of a power plant;
FIG. 2 is a schematic view of a circulating water blowdown water treatment system;
FIG. 3 is a schematic diagram of a desulfurization wastewater treatment system;
FIG. 4 is a schematic diagram of a crystallization salt production system;
FIG. 5 is a schematic diagram of a crystallization salt production system with an evaporative crystallization device being an MVR evaporative crystallization device.
Detailed Description
The present invention will be described in further detail with reference to specific examples. The starting materials or the apparatuses used in the examples were obtained from conventional commercial sources unless otherwise specified. The utility model discloses each system, equipment or device "be connected", "connect" if do not have special explanation, be through connections such as pipeline, belong to the conventional technique in this field.
Examples
Referring to the attached figure 1, the system for zero discharge of wastewater and resource utilization of the whole plant of the power plant comprises a circulating water sewage treatment system, a desulfurization wastewater treatment system and a crystallization salt making system. Wherein, the schematic diagram of the circulating water sewage treatment system can be seen in attached figure 2, the schematic diagram of the desulfurization wastewater treatment system can be seen in attached figure 3, and the schematic diagram of the crystallization salt preparation system can be seen in attached figure 4.
Referring to fig. 2, the circulating water sewage treatment system in the system comprises a first-stage flocculation sedimentation tank, a second-stage flocculation sedimentation tank, a third-stage flocculation sedimentation tank, a regulating tank, a multi-media filter, an ozone catalytic oxidation tower, a biological activated carbon filter, a self-cleaning filter, an ultrafiltration device, a reverse osmosis device, a flocculation tank, a microfiltration device and a seawater reverse osmosis device which are sequentially connected through pipelines.
In the circulating water sewage treatment system, a first-stage flocculation sedimentation tank is connected with a lime feeding device, a second-stage flocculation sedimentation tank is connected with a flue gas pipe, and a third-stage flocculation sedimentation tank is connected with a sodium carbonate feeding device. The sludge outlet of the primary flocculation sedimentation tank is also connected with a concentration tank and a dehydrator, and the sludge after dehydration treatment is transported outside. And (4) respectively conveying the sediments generated by the second-stage flocculation sedimentation tank and the third-stage flocculation sedimentation tank to a sludge concentration tank, and then conveying the sediments to a wet desulphurization system of a power plant for treatment, such as returning to a desulphurization absorption tower for treatment. The adjusting tank is used for adding acid to adjust the pH value. The fresh water outlet of the ultrafiltration device is connected with the water inlet of the reverse osmosis device. The concentrated water outlet of the reverse osmosis device is connected with the water inlet of the flocculation tank, and the fresh water outlet of the reverse osmosis device is connected with the fresh water comprehensive recycling system. The flocculation tank is connected with a double-alkali adding device, and double alkali (sodium hydroxide and calcium hydroxide) is used for flocculation treatment. The concentrated water outlet of the seawater reverse osmosis device is connected with the water storage regulating tank of the desulfurization wastewater treatment system, and the fresh water outlet of the seawater reverse osmosis device is connected with the fresh water comprehensive recycling system. Concentrated water of the multi-medium filter, the biological activated carbon filter, the self-cleaning filter and the ultrafiltration device respectively flows back to a water inlet of the three-stage flocculation sedimentation tank for circular treatment.
Referring to fig. 3, the desulfurization wastewater treatment system in the treatment system comprises a water storage regulating reservoir, a primary softening reservoir, a tubular filtration membrane device, a secondary softening clarification reservoir, a tertiary softening clarification reservoir, a multi-media filter, an ozone advanced oxidation tower, an activated carbon bed, an ultrafiltration device, a primary nanofiltration device, a secondary nanofiltration device, a seawater reverse osmosis device, a homogeneous membrane ED device, a decarburization deamination device and a buffer tank which are sequentially connected through pipelines.
In the desulfurization wastewater treatment system, a fresh water outlet of the ultrafiltration device is connected with a water inlet of the primary nanofiltration device. The fresh water outlet of the first-stage nanofiltration device is connected with the water inlet of the second-stage nanofiltration device. The fresh water outlet of the second-stage nanofiltration device is connected with the water inlet of the seawater reverse osmosis device. And sodium sulfate liquid outlets of the first-stage nanofiltration device and the second-stage nanofiltration device are respectively connected with a water storage regulating tank through return pipes, and sodium sulfate is removed through flocculation and precipitation. The concentrated water outlet of the seawater reverse osmosis device is connected with the water inlet of the homogeneous membrane ED device, and the fresh water outlet of the seawater reverse osmosis device is connected with the industrial water system for recycling. The concentrated water outlet of the homogeneous membrane ED device is connected with the water inlet of the decarburization deamination device, and the fresh water outlet of the homogeneous membrane ED device is connected with the water inlet of the reverse osmosis device in the circulating water sewage treatment system and is subjected to the fresh water synergistic treatment in the salt concentration link. The first-stage softening tank is connected with a lime feeding device, the second-stage softening clarification tank is connected with a flue gas pipe, and the third-stage softening clarification tank is connected with a sodium carbonate feeding device. The sludge outlet of the primary softening tank is also connected with a dehydrator and is transported outside after dehydration; the effluent of the dehydrator flows back to the water storage adjusting tank. And precipitates generated by the second-stage softening clarification tank and the third-stage softening clarification tank are respectively conveyed to a sludge concentration tank and then conveyed to a wet desulphurization system of a power plant for treatment, such as flowing back to a desulphurization absorption tower for treatment. The decarburization deamination device is connected with a standby overhaul pool besides being connected with a buffer pool. And the high-salt concentrated solution output by the buffer tank or the overhaul standby tank is conveyed to an evaporative crystallization device of a crystallization salt manufacturing system for treatment. The concentrated water of the multi-medium filter, the activated carbon bed and the ultrafiltration device respectively flows back to the water inlet of the three-stage softening clarification tank for circular treatment.
Referring to fig. 4, the crystallization salt production system in the system comprises an evaporative crystallization device, a centrifugal dehydrator, a drying fluidized bed and a salt bin which are sequentially connected through pipelines. The fresh water outlet of the evaporative crystallization device is connected with the water inlet of a reverse osmosis device in the circulating water sewage disposal system, and the water outlet of the evaporative crystallization device is used for circulating water make-up water. The evaporative crystallization device is also connected with a slag dragging system. And the effluent of the centrifugal dehydrator flows back to the evaporation crystallization device. The materials in the salt bin are packed, subpackaged, stored and transported outside.
Referring to fig. 5, when the evaporative crystallization apparatus is specifically selected from the MVR evaporative crystallization apparatus, the crystallization salt production system in such a system comprises a heat exchanger, an evaporative crystallizer, a centrifugal dehydrator, a drying fluidized bed, and a salt bin, which are sequentially connected by a pipeline; the evaporative crystallizer is connected with the heat exchanger through an MVR vapor compressor. The fresh water outlet of the heat exchanger is connected with the water inlet of a reverse osmosis device in the circulating water sewage disposal system, and the water outlet of the heat exchanger is used for circulating water make-up water. The evaporative crystallizer is also connected with a slag dragging system. And the effluent of the centrifugal dehydrator flows back to the evaporation crystallizer. The materials in the salt bin are packed, subpackaged, stored and transported outside.
The processing system through this embodiment handles the whole factory waste water of power plant, and circulating water blowdown water, chemical desalination waste water, the input one-level flocculation and precipitation pond such as smart high salinity waste water in the whole factory waste water of power plant get into circulating water blowdown water processing system and handle. The RO concentrated water and the desulfurization wastewater treated by the seawater reverse osmosis device of the circulating water sewage treatment system are input into a water storage regulating reservoir and enter a desulfurization wastewater treatment system for treatment. And (3) inputting the high-salt concentrated solution obtained by the buffer tank and/or the overhaul standby tank of the desulfurization wastewater treatment system into an evaporative crystallization device, and treating by a crystallization salt preparation system to obtain NaCl crystallized salt. NaCl crystal salt obtained by the crystallization salt-making system can be sold as a chemical raw material. And carrying out flocculation precipitation treatment on sodium sulfate salt of the nanofiltration concentrated water.
The treatment system of this embodiment handles the whole factory waste water of power plant, uses lime as softening agent with first-order flocculation and precipitation pond, and magnesium hydroxide, the calcium sulfate precipitation is generated in reaction with magnesium and sulfate radical, adds the poly iron and promotes the particulate matter and precipitate, handles outward after the dehydration. The flue gas desulfurized by the power plant is added into the secondary flocculation sedimentation tank, and CO in the flue gas2React with calcium to generate calcium carbonate precipitate. And adding a small amount of sodium carbonate into the third-stage flocculation precipitation to further remove calcium in the wastewater. 60 to 70 percent of sulfur can be removed by primary flocculation precipitationAcid radical. The cost of the medicament can be saved by about 75 percent. Calcium carbonate precipitates generated by the second-level flocculation precipitation reaction and the third-level flocculation precipitation reaction can be reused in a wet desulphurization system in a power plant after being concentrated by a concentration tank. Fresh water generated by the reverse osmosis device and the seawater reverse osmosis device in the circulating water sewage treatment system is conveyed to a fresh water recovery system for comprehensive recycling. Fresh water generated by the seawater reverse osmosis device in the desulfurization wastewater treatment system is conveyed to an industrial water system for reuse. And the sodium sulfate is subjected to flocculation treatment, so that zero emission of the system is realized. NaCl crystal salt obtained by the crystallization salt-making system can be sold as a chemical raw material.
The utility model discloses a processing system can get rid of 60% ~ 70% sulfate radical through lime softening, and the second grade is softened and is utilized the flue gas to replace partial sodium carbonate, and the agent cost can be practiced thrift about 75% under the condition that the effect satisfies is got rid of to hardness, and the calcium carbonate sediment of formation can be reused in wet desulfurization system in the power plant. The high-purity NaCl high-salt solution can be obtained by the synergistic action of the nanofiltration device, the reverse osmosis device and the homogeneous phase membrane ED device, and can be sold as a chemical raw material after evaporation and crystallization. The whole-plant wastewater realizes the quality-based extraction and resource utilization of wastewater components while realizing zero discharge of water, thoroughly solves the problems of the wastewater of the power plant, and has important economic and environmental benefits.
Claims (10)
1. The utility model provides a system of power plant's whole factory waste water zero release and utilization, its characterized in that: comprises a circulating water sewage treatment system, a desulfurization wastewater treatment system and a crystallization salt production system;
the circulating water sewage treatment system comprises a primary flocculation sedimentation tank, a secondary flocculation sedimentation tank, a tertiary flocculation sedimentation tank, a regulating tank, a multi-media filter, an ozone catalytic oxidation tower, a biological activated carbon filter, a self-cleaning filter, an ultrafiltration device, a reverse osmosis device, a flocculation tank, a microfiltration device and a seawater reverse osmosis device which are sequentially connected through pipelines;
the desulfurization wastewater treatment system comprises a water storage regulating tank, a primary softening tank, a tubular filtering membrane device, a secondary softening clarification tank, a tertiary softening clarification tank, a multi-medium filter, an ozone advanced oxidation tower, an activated carbon bed, an ultrafiltration device, a primary nanofiltration device, a secondary nanofiltration device, a seawater reverse osmosis device, a homogeneous membrane ED device, a decarburization deamination device and a buffer tank which are sequentially connected through pipelines;
the crystallization salt-making system comprises an evaporative crystallization device, a centrifugal dehydrator, a drying fluidized bed and a salt bin which are sequentially connected through pipelines;
the concentrated water outlet of the seawater reverse osmosis device of the circulating water sewage treatment system is connected with the water storage regulating tank of the desulfurization wastewater treatment system; the buffer tank of the desulfurization wastewater treatment system is connected with an evaporative crystallization device of a crystallization salt production system; the sodium sulfate liquid outlets of the primary nanofiltration device and the secondary nanofiltration device in the desulfurization wastewater treatment system are respectively connected with a water storage regulating tank;
the primary flocculation sedimentation tank and the primary softening tank are respectively connected with a lime feeding device; the secondary flocculation sedimentation tank and the secondary softening clarification tank are respectively connected with a flue gas pipe; the third-stage flocculation sedimentation tank and the third-stage softening clarification tank are respectively connected with a sodium carbonate feeding device.
2. The system for zero discharge of wastewater and resource utilization in a whole plant of a power plant according to claim 1, characterized in that: and sludge outlets of the second-stage flocculation sedimentation tank, the third-stage flocculation sedimentation tank, the second-stage softening clarification tank and the third-stage softening clarification tank are respectively connected with a sludge concentration tank, and the sludge concentration tank is connected with a wet desulphurization system of a power plant.
3. The system for zero discharge of wastewater and resource utilization in a whole plant of a power plant according to claim 1, characterized in that: in the circulating water sewage treatment system, fresh water outlets of a reverse osmosis device and a seawater reverse osmosis device are respectively connected with a fresh water comprehensive recycling system; a concentrated water outlet of the reverse osmosis device is connected with a water inlet of the flocculation tank; the water inlet of the reverse osmosis device is connected with the fresh water outlet of the ultrafiltration device.
4. The system for zero discharge of wastewater and resource utilization in a whole plant of a power plant according to claim 1, characterized in that: in the circulating water sewage treatment system, concentrated water outlets of the multi-medium filter, the biological activated carbon filter, the self-cleaning filter and the ultrafiltration device are respectively connected with a water inlet of the three-stage flocculation sedimentation tank.
5. The system for zero discharge of wastewater and resource utilization in a whole plant of a power plant according to claim 1, characterized in that: in the desulfurization wastewater treatment system, a water inlet of a primary nanofiltration device is connected with a fresh water outlet of an ultrafiltration device; the fresh water outlet of the first-stage nanofiltration device is connected with the water inlet of the second-stage nanofiltration device.
6. The system for zero discharge of wastewater and resource utilization of the whole plant of the power plant according to claim 1 or 5, characterized in that: in the desulfurization wastewater treatment system, a water inlet of the seawater reverse osmosis device is connected with a fresh water outlet of the secondary nanofiltration device; a fresh water outlet of the seawater reverse osmosis device is connected with an industrial water system; the concentrated water outlet of the seawater reverse osmosis device is connected with the water inlet of the homogeneous membrane ED device.
7. The system for zero discharge of wastewater and resource utilization in a whole plant of a power plant according to claim 6, characterized in that: in the desulfurization wastewater treatment system, the fresh water outlet of the homogeneous membrane ED device is connected with the water inlet of a reverse osmosis device in the circulating water sewage treatment system, and the concentrated water outlet of the homogeneous membrane ED device is connected with the water inlet of the decarburization deamination device.
8. The system for zero discharge of wastewater and resource utilization in a whole plant of a power plant according to claim 1, characterized in that: in the desulfurization wastewater treatment system, concentrated water outlets of the multi-media filter, the activated carbon bed and the ultrafiltration device are respectively connected with a water inlet of the three-stage softening clarification tank.
9. The system for zero discharge of wastewater and resource utilization in a whole plant of a power plant according to claim 1, characterized in that: in the crystallization salt-making system, a fresh water outlet of the evaporative crystallization device is connected with a water inlet of a reverse osmosis device in the circulating water sewage treatment system.
10. The system for zero discharge of wastewater and resource utilization in whole plant of power plant according to claim 1 or 9, characterized in that: in the crystallization salt-making system, the evaporation crystallization device is a multi-effect evaporation device, a single-effect evaporation device, an MVR evaporation device or a TVR evaporation device.
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