CN210559894U - Zero release and resource utilization system of whole factory of power plant waste water - Google Patents
Zero release and resource utilization system of whole factory of power plant waste water Download PDFInfo
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- CN210559894U CN210559894U CN201920880719.7U CN201920880719U CN210559894U CN 210559894 U CN210559894 U CN 210559894U CN 201920880719 U CN201920880719 U CN 201920880719U CN 210559894 U CN210559894 U CN 210559894U
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Abstract
The utility model discloses a zero release and resource utilization system of whole factory's waste water of power plant. The system for zero discharge and resource utilization of the wastewater of the whole power plant comprises a circulating water sewage treatment system, a desulfurization wastewater treatment system, a crystallization salt making system and a sodium sulfate salt treatment system. The utility model discloses a processing system has advantages such as high efficiency, reliable, economy. Use the utility model discloses a system handles power plant's waste water, substep recovery water, calcium carbonate dense solution, NaCl salt, solid flying dust material when realizing the zero release of the waste water of whole plant, realize the zero release of water and the utilization of water and solid useless resources in the true sense.
Description
Technical Field
The utility model relates to a zero release and resource utilization system of whole factory's waste water of power plant.
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 zero release and resource utilization system of whole factory's waste water of power plant, substep recovery water, calcium carbonate, NaCl crystalline salt, sodium sulfate solid flying ash when realizing the zero release of the whole factory's waste water of power plant, realized the zero release of water and the resource utilization of water and solid useless in the true sense.
The utility model adopts the technical proposal that:
a zero-emission and resource utilization system for wastewater of a whole power plant comprises a circulating water sewage treatment system, a desulfurization wastewater treatment system, a crystallization salt making system and a sodium sulfate salt treatment system;
further, 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 charcoal filtering pond, self-cleaning filter, ultrafiltration device, reverse osmosis unit, flocculation basin, micro-filtration 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 desulfurization wastewater treatment system comprises a water storage regulating reservoir, a primary softening reservoir, a tubular filtering membrane device, a secondary softening clarification reservoir, a tertiary softening clarification reservoir, a multi-medium filter, an ozone advanced oxidation tower, an activated carbon bed, an ultrafiltration device, a primary nanofiltration device and a secondary nanofiltration device which are sequentially connected through pipelines.
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.
Further, in the system, the sodium sulfate treatment system comprises a spray evaporation tower and a dust remover which are connected in sequence through pipelines.
Preferably, the buffer tank of the circulating water sewage treatment system is respectively connected with an evaporative crystallization device of the crystallization salt production system; concentrated water outlets of the primary nanofiltration device and the secondary nanofiltration device of the desulfurization wastewater treatment system are respectively connected with a spray evaporation tower of a sodium sulfate treatment system; and a fresh water outlet of the secondary nanofiltration device of the desulfurization wastewater treatment system is connected with a water inlet of a seawater reverse osmosis device of the circulating water sewage treatment system.
Preferably, in the system for zero discharge and resource utilization of the wastewater 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 the 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, a water inlet of the homogeneous phase membrane ED device is connected with a concentrated water outlet of the seawater reverse osmosis device; a concentrated water outlet of the homogeneous membrane ED device is connected with a water inlet of the decarburization deamination device; the fresh water outlet of the homogeneous phase membrane ED device is connected with the water inlet of the reverse osmosis 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 blowdown water treatment system, the decarbonization deamination device is still connected with the reserve pond of maintenance, and the reserve pond of maintenance is connected with the evaporation crystallization device of crystallization salt manufacturing system.
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, 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, 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.
Preferably, in the sodium sulfate salt treatment system, the spray evaporation tower is connected with a flue gas pipe.
Preferably, in the sodium sulfate treatment system, a solid outlet of the dust remover is connected with a fly ash rear-end treatment system; the gas outlet of the dust remover is connected with a flue gas back-end treatment system.
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 conveying the reverse osmosis effluent to a comprehensive recycling 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, and the main component of the effluent of the second-stage nanofiltration is NaCl. 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 nanofiltration concentrated water sodium sulfate removal treatment system carries out evaporation and crystallization on flue gas, solid fly ash removal end treatment and gas flue gas removal rear end process advanced treatment.
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 nanofiltration concentrated water sodium sulfate removal treatment system is characterized in that flue gas is introduced into a spray evaporation tower to vaporize concentrated brine, solid is removed from a fly ash system for treatment, and gas is removed from a flue gas post-stage system for treatment. The method realizes zero discharge of wastewater in the whole plant, simultaneously recovers water, calcium carbonate concentrated solution, NaCl salt and solid fly ash materials step by step, and really realizes zero discharge of water and resource utilization of water and solid waste.
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 circulating water sewage system realizes the concentration of salt and the reduction of waste water by combining the seawater reverse osmosis and homogeneous membrane ED devices, improves the purity of sodium chloride, simplifies an evaporative crystallization system, and saves the investment and the cost of the system.
(4) The sodium sulfate treatment system carries out evaporative crystallization by a spray evaporator through flue gas, then is separated by a dust remover, can be used as a building material additive after solid is treated by a fly ash removing end, and is discharged after the gas is subjected to advanced treatment by a flue gas removing rear end process.
Drawings
FIG. 1 is a schematic diagram of the system for zero discharge of wastewater from a whole plant and resource utilization 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;
FIG. 6 is a schematic diagram of a sodium sulfate salt treatment system.
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 zero-discharge and resource utilization system for the wastewater of the whole power plant comprises a circulating water sewage treatment system, a desulfurization wastewater treatment system, a crystallization salt making system and a sodium sulfate salt treatment 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, the schematic diagram of the crystallization salt preparation system can be seen in attached figure 4, and the schematic diagram of the sodium sulfate salt treatment system can be seen in attached figure 5.
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, 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 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 inlet of the homogeneous membrane ED device, and the fresh water outlet of the seawater reverse osmosis device is connected with the fresh water comprehensive recycling 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. 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 pool and/or the overhaul standby pool is conveyed to an evaporative crystallization device of a crystallization salt manufacturing system for treatment. 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 and a secondary nanofiltration device which are sequentially connected through pipelines.
In the desulfurization wastewater treatment system, a first-stage softening tank is connected with a lime feeding device, a second-stage softening clarification tank is connected with a flue gas pipe, and a 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 fresh water outlet of the ultrafiltration device is connected with the 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. And a fresh water outlet of the second-stage nanofiltration device is connected with a water inlet of a seawater reverse osmosis device in the circulating water sewage treatment system for cooperative treatment. Concentrated water outlets of the first-stage nanofiltration device and the second-stage nanofiltration device are respectively connected with a spray evaporation tower of a sodium sulfate treatment system. 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.
Referring to fig. 6, the sodium sulfate salt treatment system in this treatment system includes a spray evaporation tower and a dust collector connected in sequence by a pipeline. The spray evaporation tower is connected with a flue gas pipe, and the temperature of the flue gas is 100-300 ℃. The solid outlet of the dust remover is connected with a fly ash rear-end treatment system, and the solid is treated by a fly ash rear-end process; the gas outlet of the dust remover is connected with a flue gas back-end treatment system, and the gas is treated by a flue gas back-end process.
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. High salt concentrate obtained by the treatment of the circulating water sewage treatment system is input into an evaporative crystallization device and is treated by a crystallization salt making 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 the desulfurization wastewater in the wastewater of the whole power plant is input into a water storage regulating tank and enters a desulfurization wastewater treatment system for treatment. Fresh water outlet water of the secondary nano filter of the desulfurization wastewater treatment system is conveyed back to the circulating water sewage treatment system for treatment. The nanofiltration concentrated water sodium sulfate removal treatment system of the desulfurization wastewater treatment system carries out deep treatment on gas at the rear end of a flue gas through evaporation and crystallization of the flue gas, solid fly ash removal treatment and gas removal treatment.
The treatment system of the embodiment is used for treating the wastewater of the whole plant of the power plant, and the first-stage flocculation sedimentation tank takes lime as a softening agent and magnesiumReacting with sulfate radical to generate magnesium hydroxide and calcium sulfate precipitate, adding poly-iron to promote the precipitation of particles, dewatering, and transporting. 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 sulfate radical can be removed by the first-stage flocculation precipitation. 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. The sodium sulfate wastewater is evaporated and crystallized in a spray evaporation tower through flue gas spraying, and enters a subsequent dust remover for treatment, the solid fly ash can be used as a building material, and the gas enters the flue gas for subsequent process advanced 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 reverse osmosis device and the homogeneous 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 zero release and resource utilization system of whole factory of power plant waste water which characterized in that: comprises a circulating water sewage treatment system, a desulfurization wastewater treatment system, a crystallization salt making system and a sodium sulfate salt treatment 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 tank, a self-cleaning filter, an ultrafiltration device, a reverse osmosis device, a flocculation tank, a microfiltration 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 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 and a secondary nanofiltration device 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 sodium sulfate treatment system comprises a spray evaporation tower and a dust remover which are sequentially connected through pipelines;
the buffer tank of the circulating water sewage treatment system is respectively connected with an evaporative crystallization device of a crystallization salt production system; concentrated water outlets of the primary nanofiltration device and the secondary nanofiltration device of the desulfurization wastewater treatment system are respectively connected with a spray evaporation tower of a sodium sulfate treatment system; a fresh water outlet of the secondary nanofiltration device of the desulfurization wastewater treatment system is connected with a water inlet of a seawater reverse osmosis device of the circulating water sewage treatment system;
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 power plant whole plant wastewater zero-emission and resource utilization system 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 power plant whole plant wastewater zero-emission and resource utilization system 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 power plant whole plant wastewater zero-emission and resource utilization system according to claim 1 or 3, characterized in that: in the circulating water sewage treatment system, a water inlet of a homogeneous phase membrane ED device is connected with a concentrated water outlet of a seawater reverse osmosis device; a concentrated water outlet of the homogeneous membrane ED device is connected with a water inlet of the decarburization deamination device; the fresh water outlet of the homogeneous phase membrane ED device is connected with the water inlet of the reverse osmosis device.
5. The power plant whole plant wastewater zero-emission and resource utilization system 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.
6. The power plant whole plant wastewater zero-emission and resource utilization system 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.
7. The power plant whole plant wastewater zero-emission and resource utilization system 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.
8. The system for zero discharge and resource utilization of wastewater from a whole plant of a power plant according to claim 1 or 7, 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.
9. The power plant whole plant wastewater zero-emission and resource utilization system according to claim 1, characterized in that: in the sodium sulfate treatment system, a spray evaporation tower is connected with a flue gas pipe.
10. The system for zero discharge and resource utilization of wastewater from a whole plant of a power plant according to claim 1 or 9, characterized in that: in the sodium sulfate treatment system, a solid outlet of a dust remover is connected with a fly ash rear-end treatment system; the gas outlet of the dust remover is connected with a flue gas back-end treatment system.
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| CN110316897A (en) * | 2019-06-12 | 2019-10-11 | 北京浦仁美华环保科技股份有限公司 | A kind of system and method for the full factory waste water zero discharge of power plant and resource utilization |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110316897A (en) * | 2019-06-12 | 2019-10-11 | 北京浦仁美华环保科技股份有限公司 | A kind of system and method for the full factory waste water zero discharge of power plant and resource utilization |
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