CN114477593A - Concentrated water treatment system - Google Patents
Concentrated water treatment system Download PDFInfo
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- CN114477593A CN114477593A CN202210130426.3A CN202210130426A CN114477593A CN 114477593 A CN114477593 A CN 114477593A CN 202210130426 A CN202210130426 A CN 202210130426A CN 114477593 A CN114477593 A CN 114477593A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
- C02F1/4693—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis electrodialysis
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
- C02F2001/425—Treatment of water, waste water, or sewage by ion-exchange using cation exchangers
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/02—Specific form of oxidant
- C02F2305/026—Fenton's reagent
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
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Abstract
The embodiment of the application provides a dense water processing system for the high efficiency reduces the waste water discharge of thermal power factory, include: a concentrated water concentration and reduction treatment system, an evaporative crystallization salt making system, a desulfurization system and a multi-effect evaporation system; the concentrated water concentration and reduction treatment system is connected with the evaporation crystallization salt making system and the desulfurization system, and the desulfurization system is connected with the multiple-effect evaporation system; the concentrated water concentration and reduction treatment system is used for treating the first concentrated water to generate second concentrated water and circulating water, and is also used for generating regenerated backwashing water after regeneration backwashing; the evaporative crystallization salt production system is used for treating the second concentrated water to generate distilled water, sodium chloride mother liquor and sodium chloride crystals; the desulfurization system is used for treating the regenerated backwash water to generate desulfurization wastewater; the multi-effect evaporation system is used for carrying out low-temperature multi-effect concentration reduction treatment on the flue gas waste heat of the desulfurization wastewater to obtain concentrated solution. The embodiment of the application can efficiently and energy-efficiently finish the environment-friendly treatment of the concentrated water and reduce the discharge amount of the wastewater.
Description
Technical Field
The embodiment of the application relates to the field of wastewater treatment, in particular to a concentrated water treatment system.
Background
With the development of society and the continuous progress of science and technology, the environment pollution caused by industry is increasingly serious, and therefore, the national environment protection is more and more emphasized. Especially for the current thermal power plants, the supervision is also increasing. For a new project, the environmental assessment and the approval are directly zero discharge of wastewater; for the operation project, the wastewater system needs to be modified, and zero wastewater discharge is realized. The wastewater generated by the power plant needs to be treated by a system so as to achieve the aim of effectively utilizing the wastewater of the whole plant without discharging.
The wastewater treatment system in the prior art mainly adopts the membrane concentration and decrement and the MVR evaporation crystallization salt making process to treat wastewater, and the efficiency is low.
Disclosure of Invention
The embodiment of the application provides a dense water processing system for the high efficiency reduces thermal power factory waste water discharge.
A first aspect of embodiments of the present application provides a concentrated water treatment system, including: a concentrated water concentration and reduction treatment system, an evaporative crystallization salt making system, a desulfurization system and a multi-effect evaporation system;
the concentrated water concentration and reduction treatment system is connected with the evaporation crystallization salt making system and the desulfurization system, and the desulfurization system is connected with the multiple-effect evaporation system;
the concentrated water concentration and reduction treatment system is used for treating the first concentrated water to generate second concentrated water and circulating water, and is also used for generating regenerated backwashing water after regeneration backwashing;
the evaporative crystallization salt production system is used for treating the second concentrated water to generate distilled water, sodium chloride mother liquor and sodium chloride crystals;
the desulfurization system is used for treating the regenerated backwash water to generate desulfurization wastewater; the multi-effect evaporation system is used for carrying out low-temperature multi-effect concentration reduction treatment on the flue gas waste heat of the desulfurization wastewater to obtain concentrated solution.
In the embodiment of the application, a concentrated water concentration and reduction treatment system, an evaporative crystallization salt making system and a desulfurization system are used in a concentrated water treatment system, and a multi-effect evaporation system is added, so that the environment-friendly treatment of concentrated water can be efficiently and energy-efficiently completed, inorganic salts in the concentrated water are recycled, and the discharge amount of wastewater is reduced.
Optionally, the multi-effect evaporation system comprises: a desulfurization waste water tank and a flash evaporation system;
the output port of desulfurization waste water case is connected the input port of flash distillation system, and the output port of desulfurization system is connected to the input port of desulfurization waste water case for desulfurization waste water that desulfurization waste water case received desulfurization system and produced.
In the embodiment of the application, the flash evaporation system is used for multi-effect evaporation, the recovery efficiency is high, and the energy consumption is low.
Optionally, the flash system comprises: the first effect flash system, the second effect flash system and the third effect flash system are connected in sequence;
the input port of the first-effect flash system is connected with the output port of the desulfurization waste water tank.
In the embodiment of the application, a triple-effect flash evaporation system is used, and the realizability of the scheme is improved.
Optionally, the concentrated water concentration and reduction treatment system comprises: the device comprises a tempering water tank, a softening and desiliconizing unit, a Chemical Oxygen Demand (COD) removing unit, a manganese sand filter, an ultrafiltration unit, a resin hardness removing unit, an electrodialysis concentration ED unit, an ED fresh water tank, an ED fresh water reverse osmosis unit and an ED fresh water reverse osmosis fresh water tank which are connected in sequence;
the resin hardness removal unit generates regenerated backwashing water, and an output port of the resin hardness removal unit is connected with an input port of the desulfurization system;
and the electrodialysis concentration ED unit generates second concentrated water, and the output port of the electrodialysis concentration ED unit is connected with the input port of the evaporative crystallization salt making system.
In the embodiment of this application, use the quenching and tempering water tank, soften and remove the silicon unit, remove chemical oxygen demand COD unit, manganese sand filter, ultrafiltration unit, resin and remove hard unit, the concentrated ED unit of electrodialysis, ED fresh water case, ED fresh water reverse osmosis unit and the concentrated decrement processing system of the concentrated water of the fresh water reverse osmosis of ED, improved the realizability of this scheme.
Optionally, the COD removal unit is for performing fenton treatment.
In this application embodiment, except that the COD unit carries out fenton and handles, fully reduce the COD of dense aquatic, improved the realizability of this scheme.
Optionally, the resin de-hardening unit comprises: the ultrafiltration unit, the ultrafiltration water-producing tank, the weak acid cation bed and the weak acid cation bed water-producing tank are connected in sequence;
the output port of the manganese sand filter is connected with the input port of the ultrafiltration unit, and the output port of the weak acid cation bed water production tank is connected with the input port of the electrodialysis concentration ED unit;
the regenerated backwashing water is generated by a weak acid cation bed of a concentrated water concentration and reduction treatment system during the regeneration backwashing, and an output port of the weak acid cation bed is connected with an input port of a desulfurization system.
In this application embodiment, use ultrafiltration unit, ultrafiltration to produce water tank, weak acid cation bed and produce the water tank and constitute resin and remove hard unit, improved the realizability of this scheme.
Optionally, an input port of the manganese sand filter or the ultrafiltration unit is connected with the ultrafiltration water production tank, so that the manganese sand filter or the ultrafiltration unit filters backwash water generated by the ultrafiltration water production tank.
In the embodiment of the application, the ultrafiltration water production tank and the manganese sand filter or the ultrafiltration unit form a circulating body, so that the realizability of the scheme is improved.
Optionally, the concentrated water concentration and reduction treatment system further comprises: a wastewater collection tank;
the waste water collecting tank is used for receiving backwash water connected with the manganese sand filter, backwash water of the ultrafiltration unit and flushing water of the ED fresh water reverse osmosis unit, and an output port of the waste water collecting tank is connected with an input port of the tempering water tank.
In the embodiment of the application, the wastewater collecting tank is used, the circulating body consisting of the wastewater collecting tank, the manganese sand filter, the ultrafiltration unit, the ED fresh water reverse osmosis unit and the tempering water tank is constructed, and the effect of concentrated water treatment is improved.
Optionally, the concentrated water concentration and reduction treatment system further comprises: a sludge storage tank;
the sludge storage tank is used for receiving the sludge generated by the softening silicon removal unit and the COD removal unit.
In the embodiment of the application, the sludge storage tank is used for receiving the sludge generated by the softening silicon removal unit and the COD removal unit, so that the realizability of the embodiment of the application is improved.
Optionally, the salt preparation system by evaporative crystallization comprises: the system comprises an ED concentrated water buffer water tank, a vapor recompression evaporation MVR evaporative crystallizer, a forced circulation crystallization unit, a dryer and a packaging machine which are connected in sequence;
and an input port of the ED concentrated water buffer water tank is connected with a concentrated water reduction treatment system.
In the embodiment of the application, use ED dense water buffer tank, vapor recompression evaporation MVR evaporative crystallizer, forced circulation crystallization unit, desicator and packagine machine to constitute evaporation crystallization salt manufacturing system, improved the realizability of this scheme.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view showing the connection of a concentrated water concentration and decrement treatment system, an evaporative crystallization salt production system and a desulfurization system of a concentrated water treatment system according to an embodiment of the present application;
FIG. 2 is a schematic diagram of the multi-effect evaporation system connections of the concentrated water treatment system of the embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the application provides a dense water processing system for the high efficiency reduces thermal power factory waste water discharge.
Coal, petroleum or natural gas are generally used as fuel in thermal power plants. When fuel, combustion exhaust gas, combustion slag, and the like are treated, a large amount of wastewater is generated, and the wastewater is treated to become reverse osmosis strong brine, which is also called as dense water. The concentrated water cannot be directly discharged, otherwise serious environmental pollution can be caused. A large amount of inorganic salts are dissolved in the concentrated water. The inorganic salt in the waste water is recovered and purified, and can be used as an industrial raw material, so that the cost is reduced, and the resources are saved.
As shown in fig. 1 to 2, an embodiment of the present application provides a concentrated water treatment system, including: concentrated water concentration and decrement treatment system, evaporation crystallization salt making system, desulfurization system and multi-effect evaporation system.
The output port of the concentrated water concentration and decrement treatment system is connected with the input port of the evaporative crystallization salt production system. An output port of the concentrated water concentration and reduction treatment system for outputting backwash water is connected with an input port of the desulfurization system. The output port of the desulfurization system is connected with the input port of the multi-effect evaporation system.
The concentrated water concentration and reduction treatment system is used for receiving the first concentrated water, performing concentrated water concentration and reduction treatment on the first concentrated water to generate second concentrated water and circulating water, and generating regenerated backwashing water after regeneration backwashing and outputting the regenerated backwashing water to the desulfurization system. The first concentrated water includes waste water generated from a thermal power plant and backwash water, regeneration backwash water, wash water, etc. collected in a waste water collection tank.
The evaporative crystallization salt production system is used for receiving second concentrated water generated by the concentrated water reduction treatment system and carrying out evaporative crystallization treatment on the second concentrated water to generate distilled water, sodium chloride mother liquor and sodium chloride crystals;
the desulfurization system is used for receiving the regenerated backwashing water generated by the concentrated water reduction treatment system and performing desulfurization treatment on the regenerated backwashing water to generate desulfurization wastewater; the multi-effect evaporation system is used for receiving the desulfurization wastewater generated by the desulfurization system and carrying out low-temperature multi-effect concentration and reduction treatment on the desulfurization wastewater to obtain concentrated solution.
In the embodiment of the application, a concentrated water concentration and reduction treatment system, an evaporative crystallization salt making system and a desulfurization system are used in a concentrated water treatment system, and a multi-effect evaporation system is added, so that the environment-friendly treatment of concentrated water can be efficiently and energy-efficiently completed, inorganic salts in the concentrated water are recycled, and the discharge amount of wastewater is reduced.
As shown in fig. 1 to 2, an embodiment of the present application provides a concentrated water treatment system, including: a concentrated water concentration and reduction treatment system, an evaporative crystallization salt making system, a desulfurization system and a multi-effect evaporation system;
the concentrated water concentration and reduction treatment system is connected with the evaporation crystallization salt making system and the desulfurization system, and the desulfurization system is connected with the multiple-effect evaporation system;
the concentrated water concentration and decrement treatment system is used for treating the first concentrated water to generate second concentrated water and circulating water, and is also used for generating regeneration backwashing water after regeneration backwashing;
the evaporative crystallization salt production system is used for treating the second concentrated water to generate distilled water, sodium chloride mother liquor and sodium chloride crystals;
the desulfurization system is used for treating the regenerated backwash water to generate desulfurization wastewater; the multi-effect evaporation system is used for carrying out low-temperature multi-effect concentration reduction treatment on the flue gas waste heat of the desulfurization wastewater to obtain concentrated solution.
A multi-effect evaporation system comprising: a desulfurization waste water tank and a flash evaporation system;
the output port of desulfurization waste water case is connected the input port of flash distillation system, and the output port of desulfurization system is connected to the input port of desulfurization waste water case for desulfurization waste water that desulfurization waste water case received desulfurization system and produced.
The flash system includes: the first effect flash system, the second effect flash system and the third effect flash system are connected in sequence;
the input port of the first-effect flash system is connected with the output port of the desulfurization waste water tank.
Concentrated water concentration decrement processing system includes: the device comprises a tempering water tank, a softening and desiliconizing unit, a COD (chemical oxygen demand) removing unit, a manganese sand filter, an ultrafiltration unit, a resin hardness removing unit, an electrodialysis concentration ED unit, an ED fresh water tank, an ED fresh water reverse osmosis unit and an ED fresh water reverse osmosis fresh water tank which are connected in sequence;
the resin hardness removal unit generates regenerated backwashing water, and an output port of the resin hardness removal unit is connected with an input port of the desulfurization system;
and the electrodialysis concentration ED unit generates second concentrated water, and the output port of the electrodialysis concentration ED unit is connected with the input port of the evaporative crystallization salt making system.
The COD removing unit is used for performing Fenton treatment.
The resin hardening removal unit includes: the ultrafiltration unit, the ultrafiltration water-producing tank, the weak acid cation bed and the weak acid cation bed water-producing tank are connected in sequence;
the output port of the manganese sand filter is connected with the input port of the ultrafiltration unit, and the output port of the weak acid cation bed water production tank is connected with the input port of the electrodialysis concentration ED unit;
the regenerated backwashing water is generated by a weak acid cation bed of a concentrated water concentration and reduction treatment system during the regeneration backwashing, and an output port of the weak acid cation bed during the regeneration backwashing is connected with an input port of a desulfurization system.
The input port of the manganese sand filter or the ultrafiltration unit is connected with the ultrafiltration water production tank, so that the manganese sand filter or the ultrafiltration unit filters backwash water generated by the ultrafiltration water production tank.
The concentrated water concentration and reduction treatment system further comprises: a wastewater collection tank;
the waste water collecting tank is used for receiving backwash water connected with the manganese sand filter, backwash water of the ultrafiltration unit and flushing water of the ED fresh water reverse osmosis unit, and an output port of the waste water collecting tank is connected with an input port of the tempering water tank.
The concentrated water concentration and reduction treatment system further comprises: a sludge storage tank;
the sludge storage tank is used for receiving the sludge generated by the softening silicon removal unit and the COD removal unit.
The evaporative crystallization salt manufacturing system comprises: the system comprises an ED concentrated water buffer water tank, a vapor recompression evaporation MVR evaporative crystallizer, a forced circulation crystallization unit, a dryer and a packaging machine which are connected in sequence;
and an input port of the ED concentrated water buffer water tank is connected with a concentrated water reduction treatment system.
As shown in fig. 1 to 2, an embodiment of the present application provides a concentrated water treatment system, including: concentrated water concentration and decrement treatment system, evaporation crystallization salt making system, desulfurization system and multi-effect evaporation system. Wherein, concentrated water concentration decrement processing system includes: the device comprises a tempering water tank, a softening and desiliconizing unit, a COD (chemical oxygen demand) removing unit, a manganese sand filter, an ultrafiltration unit, a resin hardness removing unit, an electrodialysis concentration ED unit, an ED fresh water tank, an ED fresh water reverse osmosis unit and an ED fresh water reverse osmosis fresh water tank which are connected in sequence; the evaporative crystallization salt manufacturing system comprises: the system comprises an ED concentrated water buffer water tank, a vapor recompression evaporation MVR evaporative crystallizer, a forced circulation crystallization unit, a dryer and a packaging machine which are connected in sequence; the forced circulation crystallization unit comprises a centrifuge. The desulfurization system comprises a desulfurization process water tank; a multi-effect evaporation system comprising: desulfurization waste water case, first effect flash distillation system, second effect flash distillation system and the third effect flash distillation system that connect gradually.
The first concentrated water produced by the thermal power plant is stored in the tempering water tank, and the output port of the tempering water tank is connected with the input port of the softening and silicon-removing unit. The softening and desiliconizing unit is used for desiliconizing and softening the first concentrated water, converting silicate ions, magnesium ions, calcium ions and the like into precipitates, filtering the first concentrated water in the softening and desiliconizing unit to obtain filter residues, and pouring the filter residues into a sludge storage pool. The filter residue contains precipitate converted from silicate ion, magnesium ion, calcium ion, etc.
The output port of the softening and silicon-removing unit is connected with the input port of the COD removing unit. The COD removing unit carries out oxidation treatment, such as Fenton treatment, on the first concentrated water so as to reduce the chemical oxygen content in the first concentrated water. And after the first concentrated water is subjected to Fenton treatment, filtering the first concentrated water to obtain filter residue, and pouring the filter residue into a sludge storage pool. And (4) conveying the sludge in the sludge storage tank into a desulfurization unit filter pressing workshop for desulfurization and filter pressing treatment.
The output port of the COD removing unit is connected with the input port of the water producing pool, and the first concentrated water from which the filter residue is separated is input into the water producing pool. The output port of the water producing tank is connected with the input port of the manganese sand filter. The manganese sand filter filters the first concentrated water. The output port of the manganese sand filter is connected with the input port of the ultrafiltration unit. And backwashing the manganese sand filter to obtain backwash water, and inputting the backwash water into a wastewater collection tank. The output port of the waste water collecting tank is connected with the input port of the tempering water tank.
The ultrafiltration unit ultrafilters the first concentrated water. The output port of the ultrafiltration unit is connected with the input port of the ultrafiltration water production tank. The output port of the ultrafiltration water production tank is connected with the input port of the weak acid cation bed. And backwashing the ultrafiltration unit to obtain backwash water, and inputting the backwash water into a wastewater collection tank. And backwashing the ultrafiltration water production tank to obtain backwash water, and inputting the backwash water into a manganese sand filter or an ultrafiltration unit for circulating filtration.
The weak acid cation bed treats the first concentrated water to remove metal cations in the first concentrated water. The output port of the weak acid cation bed is connected with the input port of the water tank of the weak acid cation bed. The weak acid cation bed water production tank is also called a decarbonization tower. The weak acid cation bed water production tank can blow off carbon dioxide dissolved in the first concentrated water by wind power generated by a fan.
And (3) regenerating and backwashing the weak acid cation bed to obtain regenerated backwashing water, and inputting the regenerated backwashing water into a desulfurization process water tank for desulfurization treatment.
The output port of the weak acid cation bed water production tank is connected with the input port of the electrodialysis concentration ED unit. The electrodialysis concentration unit carries out electrodialysis treatment on the first concentrated water to obtain ED fresh water and ED concentrated water, the ED fresh water is input into the ED fresh water tank, and the ED concentrated water is input into the ED concentrated water buffer tank. The ED concentrated water may also be referred to as second concentrated water.
The output port of the ED fresh water tank is connected with the input port of the ED fresh water reverse osmosis unit. The ED fresh water reverse osmosis unit carries out reverse osmosis on the ED fresh water to obtain concentrated water and fresh water, the concentrated water is input into the conditioning water tank, and the fresh water is input into the ED fresh water reverse osmosis fresh water tank. The fresh water in the ED fresh water reverse osmosis fresh water tank can be used as circulating water or make-up water. And flushing the ED fresh water reverse osmosis unit to obtain flushing water, and inputting the flushing water into a wastewater collection pool.
The output port of the ED concentrated water buffer water tank is connected with the input port of the MVR evaporative crystallizer. And the MVR evaporation crystallizer is used for carrying out vapor recompression evaporation treatment on the second concentrated water to obtain distilled water, sodium chloride mother liquor and crystals, the distilled water is output to the circulating water tower, and the sodium chloride mother liquor is output to a boiler area. And (4) treating the crystals by using a centrifugal machine, a dryer and a packaging machine in sequence to obtain dried sodium chloride crystals. The centrifugal machine is used for drying, the dryer is used for drying, and the packing machine is used for stacking.
And the desulfurization process water tank receives the regenerated backwashing water of the weak acid cation bed and carries out desulfurization treatment on the regenerated backwashing water to obtain the desulfurization wastewater. The output port of the desulfurization process water tank is connected with the input port of the desulfurization waste water tank. The desulfurization wastewater tank receives desulfurization wastewater. The output port of desulfurization waste water case is connected the input port of first effect flash system, and the input port of second effect flash system is connected to the output port of first effect flash system, and the output port of second effect flash system connects the output port of third effect flash system. The first effect flash system, the second effect flash system and the third effect flash system form a three-effect flash system. And the triple-effect flash evaporation system carries out flash evaporation treatment on the second concentrated water by using the waste heat of the flue gas to obtain concentrated solution. The concentrated solution can be output to a boiler room for comprehensive utilization.
The desulfurization waste water may also be referred to as desulfurization system waste water. The desulfurization waste water may be treated by an existing desulfurization waste water treatment apparatus.
The concentrated water treatment system through this application embodiment handles the waste water that the power plant produced, but effectual reutilization waste water saves the water resource to accord with local environmental protection requirement, no waste water is arranged outward. Wastewater generated by a power plant is introduced into a concentrated water treatment system, and is treated in the modes of pretreatment, oxidation, softening, concentration, reduction and the like, and the wastewater is secondarily utilized after treatment. The device is used for treating the wastewater of the power plant, the wastewater of the whole plant is effectively utilized, and the wastewater is not discharged outside, thereby meeting the requirement of environmental protection.
The concentrated water treatment system of the embodiment of the application can be applied to the comprehensive utilization project of the wastewater of the whole plant, and is used for preparing salt by evaporation crystallization after concentrated and reduced process of flue gas waste heat at low temperature for the desulfurization wastewater. The concentrated water treatment system is divided into three subsystems of a concentrated water reverse osmosis concentrated brine concentration and decrement treatment system, an evaporation crystallization salt making system and a desulfurization wastewater flue gas waste heat low-temperature multi-effect concentration and decrement treatment system. The water inflow of the concentrated water reverse osmosis concentrated brine concentration and decrement treatment system is 31m3/h, the evaporative crystallization salt manufacturing system is designed according to the treatment capacity of 7m3/h, and the water inflow of the desulfurization wastewater flue gas waste heat low-temperature multi-effect concentration and decrement system is 20m 3/h.
The core point of the scheme is that different modes of treatment are carried out according to different impurity contents of wastewater, concentrated water subjected to reverse osmosis is concentrated and reduced, desulfurization wastewater is pretreated and then subjected to multiple-effect evaporation treatment, compared with the prior technical scheme, Fenton treatment, silicon removal and multiple-effect evaporation are adopted, and the process route is greatly improved compared with the prior art.
As shown in fig. 1 to 2, the concentrated water reverse osmosis concentrated brine concentration and decrement treatment system adopts the following main process flows:
concentrated water reverse osmosis concentrated water → concentrated water reverse osmosis concentrated water buffer tank → softening and silicon removing unit → COD removing unit → manganese sand filtering unit → ultrafiltration unit → resin hardness removing unit → electrodialysis concentration ED → ED concentrated water buffer tank.
The main process flow of the evaporative crystallization salt production system adopts:
an ED concentrated water buffer tank → evaporative crystallization for salt production (vapor recompression evaporation MVR → forced circulation crystallization → dehydration → drying → packaging metering → stacking device).
The main process flow of the desulfurization wastewater concentration and decrement treatment system adopts: low-temperature multi-effect concentration and reduction of flue gas waste heat → comprehensive utilization.
In the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A concentrated water treatment system, comprising: a concentrated water concentration and reduction treatment system, an evaporative crystallization salt making system, a desulfurization system and a multi-effect evaporation system;
the concentrated water concentration and decrement treatment system is connected with the evaporative crystallization salt making system and the desulfurization system, and the desulfurization system is connected with the multi-effect evaporation system;
the concentrated water concentration and reduction treatment system is used for treating the first concentrated water to generate second concentrated water and circulating water, and is also used for generating regenerated backwashing water after regeneration backwashing;
the evaporative crystallization salt production system is used for treating the second concentrated water to generate distilled water, sodium chloride mother liquor and sodium chloride crystals;
the desulfurization system is used for treating the regenerated backwashing water to generate desulfurization wastewater; the multi-effect evaporation system is used for carrying out low-temperature multi-effect concentration reduction treatment on the flue gas waste heat of the desulfurization wastewater to obtain concentrated solution.
2. The concentrated water treatment system of claim 1, wherein the multi-effect evaporation system comprises: a desulfurization waste water tank and a flash evaporation system;
the output port of desulfurization waste water case is connected the input port of flash distillation system, the input port of desulfurization waste water case is connected the output port of desulfurization system for desulfurization waste water case receives the desulfurization system produces desulfurization waste water.
3. The concentrate water treatment system of claim 2, wherein the flash system comprises: the first effect flash system, the second effect flash system and the third effect flash system are connected in sequence;
and the input port of the first-effect flash evaporation system is connected with the output port of the desulfurization waste water tank.
4. The concentrated water treatment system according to any one of claims 1 to 3, wherein said concentrated water concentration reduction treatment system comprises: the device comprises a tempering water tank, a softening and desiliconizing unit, a COD (chemical oxygen demand) removing unit, a manganese sand filter, an ultrafiltration unit, a resin hardness removing unit, an electrodialysis concentration ED unit, an ED fresh water tank, an ED fresh water reverse osmosis unit and an ED fresh water reverse osmosis fresh water tank which are connected in sequence;
the resin hardness removal unit generates the regenerated backwashing water, and an output port of the resin hardness removal unit is connected with an input port of the desulfurization system;
the electrodialysis concentration ED unit generates the second concentrated water, and an output port of the electrodialysis concentration ED unit is connected with an input port of the evaporative crystallization salt making system.
5. The concentrated water treatment system of claim 4, wherein the COD removal unit is configured to perform a Fenton treatment.
6. The concentrated water treatment system according to claim 4, wherein the resin hardening unit comprises: the ultrafiltration unit, the ultrafiltration water-producing tank, the weak acid cation bed and the weak acid cation bed water-producing tank are connected in sequence;
the output port of the manganese sand filter is connected with the input port of the ultrafiltration unit, and the output port of the weak acid cation bed water production tank is connected with the input port of the electrodialysis concentration ED unit;
the regenerated backwashing water is generated by the weak acid cation bed of the concentrated water concentration and reduction treatment system during regeneration backwashing, and the output port of the weak acid cation bed is connected with the input port of the desulfurization system.
7. The concentrate treatment system of claim 6, wherein an input of the manganese sand filter or the ultrafiltration unit is connected to the ultrafiltration product tank such that the manganese sand filter or the ultrafiltration unit filters backwash water produced by the ultrafiltration product tank.
8. The concentrate treatment system of claim 6 or 7, further comprising: a wastewater collection tank;
the waste water collecting tank is used for receiving backwash water connected with the manganese sand filter, backwash water of the ultrafiltration unit and flushing water of the ED fresh water reverse osmosis unit, and an output port of the waste water collecting tank is connected with an input port of the tempering water tank.
9. The concentrate treatment system of claim 4, further comprising: a sludge storage tank;
the sludge storage tank is used for receiving the sludge generated by the softening silicon removal unit and the COD removal unit.
10. The concentrated water treatment system according to any one of claims 1 to 3, wherein the evaporative crystallization salt production system comprises: the system comprises an ED concentrated water buffer water tank, a vapor recompression evaporation MVR evaporative crystallizer, a forced circulation crystallization unit, a dryer and a packaging machine which are connected in sequence;
and an input port of the ED concentrated water buffer water tank is connected with the concentrated water reduction treatment system.
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