CN219217619U - Wastewater treatment system for freezing concentration coupling negative pressure vacuum evaporation crystallization - Google Patents
Wastewater treatment system for freezing concentration coupling negative pressure vacuum evaporation crystallization Download PDFInfo
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- CN219217619U CN219217619U CN202320175513.0U CN202320175513U CN219217619U CN 219217619 U CN219217619 U CN 219217619U CN 202320175513 U CN202320175513 U CN 202320175513U CN 219217619 U CN219217619 U CN 219217619U
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Abstract
The utility model discloses a wastewater treatment system for freezing concentration coupling negative pressure vacuum evaporation crystallization, and belongs to the technical field of wastewater treatment. The system comprises an ice making unit, an ice melting unit, an evaporation crystallization unit and a heat pump unit, and fully utilizes a cold source and a heat source of the heat pump technology, wherein the cold source is used for making ice and pre-concentrating pollutants in the ice making process, and the heat source is used for evaporating and crystallizing concentrated mother liquor, so that the energy consumption is greatly reduced, and the treatment cost is reduced.
Description
Technical Field
The utility model belongs to the technical field of wastewater treatment, and particularly relates to a wastewater treatment system for freezing concentration coupling negative pressure vacuum evaporation crystallization.
Background
Along with the rapid development of national economy in China, the treatment of high-concentration and high-pollution wastewater such as landfill leachate, high-salt wastewater and the like has become a huge environmental problem.
Taking landfill leachate as an example, the total amount of domestic garbage in 2020 reaches 2.35×10 8 t, wherein the landfill and incineration treatments are 7.78X10 respectively 7 t and 1.46×10 8 t, both of which can produce considerable amounts of percolate. Under the current technical conditions, the treatment of the percolate will produce a concentrate of 13% -30%. The high pollutant concentration and low biodegradability of the percolate concentrate make it a potential source of pollution with very strong environmental destruction. The treatment modes of the concentrated solution mainly comprise recharging, concentrating and innocent treatment of 3 kinds. Wherein the concentration treatment mainly comprises a decrement method based on a membrane technology and an evaporation technology; the harmless treatment mainly comprises coagulation/electric flocculation, adsorption, advanced oxidation and other technologies.
The garbage leachate treatment process based on the membrane technology comprises the following steps: pretreatment regulation system, anaerobic treatment system, AO nitrification and denitrification treatment system, ultrafiltration system, chemical softening and membrane advanced treatment system (RO), concentrate reduction treatment system (TUF+DTRO), etc. The concentrated solution reduction treatment system can further reduce the nanofiltration concentrated water and the reverse osmosis concentrated water, and the concentrated solution after the reduction treatment can only be further treated by a mode of back-fire blending or evaporation at present.
Because the combustion heat value of the garbage is greatly reduced by back-firing, equipment in an evaporation treatment mode is easy to scale and the treatment cost is high, a treatment system capable of being used for high-concentration high-pollution wastewater needs to be designed.
Disclosure of Invention
1. Problems to be solved
Aiming at the problems of reducing the combustion heat value of garbage and high easy scaling and high treatment cost of evaporation treatment equipment existing in the existing process of waste water treatment by mixing and burning or evaporating concentrated solution in a back furnace, the utility model provides a waste water treatment system for freezing concentration coupling negative pressure vacuum evaporation crystallization. The wastewater treatment system comprises an ice making unit, an ice melting unit, an evaporation crystallization unit and a heat pump unit, and fully utilizes a cold source and a heat source of the heat pump technology, wherein the cold source is used for making ice and pre-concentrating pollutants in the ice making process, and the heat source is used for evaporating and crystallizing concentrated mother liquor, so that the energy consumption is greatly reduced, and the treatment cost is reduced.
2. Technical proposal
In order to solve the problems, the technical scheme adopted by the utility model is as follows:
the utility model relates to a wastewater treatment system for freezing concentration coupling negative pressure vacuum evaporation crystallization, which comprises an ice making unit, an ice melting unit, an evaporation crystallization unit and a heat pump unit, wherein the ice making unit comprises an ice crystal generator, a storage tank A, a storage tank B and a storage tank C, the ice crystal generator is connected with the storage tank A, the storage tank B and the storage tank C through pipelines, and an ice making circulating pump is arranged on the pipeline connecting the ice crystal generator with the storage tank A, the storage tank B and the storage tank C;
the deicing unit comprises a gas condenser, a storage tank A, a storage tank B and a storage tank C, wherein the gas condenser is connected with the storage tank A, the storage tank B and the storage tank C through pipelines, and a deicing circulating pump is arranged on the pipelines, connected with the storage tank A, the storage tank B and the storage tank C, of the gas condenser;
the evaporation crystallization unit comprises a mother liquor storage tank, a mother liquor crystallizer and a gas condenser, wherein the mother liquor storage tank is connected with the mother liquor crystallizer through a pipeline, the mother liquor crystallizer is connected with the gas condenser through a pipeline, and the mother liquor storage tank is connected with a storage tank A, a storage tank B and a storage tank C through pipelines,
the heat pump unit comprises a heat pump compressor, a mother liquor crystallizer and an ice crystal generator, wherein the heat pump compressor is connected with the mother liquor crystallizer through a pipeline, the mother liquor crystallizer is connected with the ice crystal generator through a pipeline, and an expansion valve is arranged on the pipeline connecting the mother liquor crystallizer with the ice crystal generator.
Preferably, a mother liquor pump is provided on the piping connecting the mother liquor tank with the tank a, the tank B and the tank C.
Preferably, a mother liquor booster pump is arranged on a pipeline between the mother liquor storage tank and the mother liquor crystallizer.
Preferably, the condenser is connected with a clean water pipeline, and a condensate pump is arranged on the clean water pipeline.
Preferably, the condenser is connected with an exhaust pipe, and a vacuum pump is arranged on the exhaust pipe.
Preferably, a residue port is arranged at the bottom of the mother liquor crystallizer, and the mother liquor crystallizer is connected with a residue collecting pipeline through the residue port.
Preferably, a first wastewater stock solution inlet is formed in the top of the storage tank A, and a first ice making outlet, a first ice melting outlet and a first mother solution outlet are formed in the bottom of the storage tank A.
Preferably, a second wastewater stock solution inlet is formed in the top of the storage tank B; the bottom of the storage tank B is provided with a second ice making outlet, a second ice melting outlet and a second mother liquor outlet.
Preferably, a third water-waste stock solution inlet is formed in the top of the storage tank C, and a third ice making outlet, a third ice melting outlet and a third mother solution outlet are formed in the bottom of the storage tank C.
Preferably, the volumes of the storage tank a, the storage tank B and the storage tank C are the same.
3. Advantageous effects
Compared with the prior art, the utility model has the beneficial effects that:
(1) According to the wastewater treatment system for freezing concentration coupling negative pressure vacuum evaporation crystallization, disclosed by the utility model, a cold source and a heat source of a heat pump technology are fully utilized, the cold source is used for making ice and pre-concentrating pollutants in the ice making process, and the heat source is used for evaporating and crystallizing concentrated mother liquor, so that the energy consumption is greatly reduced, and the treatment cost is reduced;
(2) According to the wastewater treatment system for freezing concentration coupling negative pressure vacuum evaporation crystallization, unlike heating evaporation, scaling is avoided in the running process of the freezing crystallization concentration system, and scaling of negative pressure vacuum crystallization is greatly reduced;
(3) The wastewater treatment system for freezing concentration coupling negative pressure vacuum evaporation crystallization provided by the utility model has the advantages that the ice crystal generator cools the landfill leachate concentrate to generate ice crystals, tiny ice crystals separated from wastewater and low-temperature low-pressure evaporated vapor are high in purity, and only a small amount of residues are generated after the treatment of the system.
Drawings
FIG. 1 is a schematic diagram of a wastewater treatment system with freeze concentration coupled with negative pressure vacuum evaporation crystallization according to the present utility model;
in the figure:
110. an ice-making circulation pump; 120. an ice crystal generator; 130. a storage tank A;
140. a storage tank B; 150. a storage tank C; 210. an ice-melting circulating pump;
220. a condenser; 230. a condensate pump; 240. a vacuum pump;
310. a mother liquor storage tank; 320. a mother liquor booster pump; 330. a mother liquor crystallizer;
3310. a residue port; 360. a mother liquid pump; 410. a heat pump compressor;
420. an expansion valve.
Detailed Description
The utility model is further described below in connection with specific embodiments.
Example 1
As shown in FIG. 1, the wastewater treatment system for freeze concentration coupled negative pressure vacuum evaporation crystallization comprises an ice making unit, an ice melting unit, an evaporation crystallization unit and a heat pump unit, wherein the ice making unit comprises an ice crystal generator 120, a storage tank A130, a storage tank B140 and a storage tank C150, the ice crystal generator 120 is connected with the storage tank A130, the storage tank B140 and the storage tank C150 through pipelines, and an ice making circulating pump 110 is arranged on the pipeline of the ice crystal generator 120 connected with the storage tank A130, the storage tank B140 and the storage tank C150.
The deicing unit comprises a gas condenser 220, a storage tank A130, a storage tank B140 and a storage tank C150, wherein the gas condenser 220 is connected with the storage tank A130, the storage tank B140 and the storage tank C150 through pipelines, and a deicing circulating pump 210 is arranged on the pipelines of the gas condenser 220, which are connected with the storage tank A130, the storage tank B140 and the storage tank C150. The condenser 220 is also connected to a clean water pipe, on which a condensate pump 230 is provided, and an exhaust pipe, on which a vacuum pump 240 is provided.
The evaporative crystallization unit comprises a mother liquor storage tank 310, a mother liquor crystallizer 330 and a condenser 220, wherein the mother liquor storage tank 310 is connected with the mother liquor crystallizer 330 through a pipeline, a mother liquor booster pump 320 is arranged on the pipeline between the mother liquor storage tank 310 and the mother liquor crystallizer 330, the mother liquor crystallizer 330 is connected with the condenser 220 through a pipeline, the mother liquor storage tank 310 is connected with a storage tank A130, a storage tank B140 and a storage tank C150 through a pipeline, and a mother liquor pump 360 is arranged on the pipeline connecting the mother liquor storage tank 310 with the storage tank A130, the storage tank B140 and the storage tank C150. The bottom of the mother liquor crystallizer 330 is further provided with a residue port 3310, and the mother liquor crystallizer 330 is connected to a residue collecting pipe via the residue port 3310 to collect residues processed by the mother liquor crystallizer 330.
The heat pump unit comprises a heat pump compressor 410, a mother liquor crystallizer 330 and an ice crystal generator 120, wherein the heat pump compressor 410 is connected with the mother liquor crystallizer 330 through a pipeline, the mother liquor crystallizer 330 is connected with the ice crystal generator 120 through a pipeline, and an expansion valve 420 is arranged on the pipeline connecting the mother liquor crystallizer 330 with the ice crystal generator 120.
It should be noted that, the volumes of the storage tank a130, the storage tank B140 and the storage tank C150 are the same, a first wastewater stock solution inlet is provided at the top of the storage tank a130, and a first ice making outlet, a first ice melting outlet and a first mother solution outlet are provided at the bottom of the storage tank a 130; a second wastewater stock solution inlet is formed in the top of the storage tank B140; the bottom of the storage tank B140 is provided with a second ice making outlet, a second ice melting outlet and a second mother liquor outlet; and a third waste water and crude liquid inlet is arranged at the top of the storage tank C150, and a third ice making outlet, a third ice melting outlet and a third mother liquid outlet are arranged at the bottom of the storage tank C150.
The wastewater treatment system adopting the freezing concentration coupling negative pressure vacuum evaporation crystallization of the utility model is used for wastewater treatment, and the specific process is as follows:
1. ice making unit
The raw liquid of the wastewater to be treated enters the storage tank through the raw liquid inlet, and the storage tank can be any one of the storage tank A130, the storage tank B140 or the storage tank C150. The stock solution after entering the storage tank is conveyed to the ice crystal generator 120 through the ice making circulating pump 110, part of water in the stock solution is frozen into ice crystals and then flows back to the storage tank along with the unfrozen stock solution, the ice crystals are trapped after being separated by the filter screen in the storage tank, the stock solution is continuously conveyed to the ice crystal generator 120 through the ice making circulating pump 110 until the stock solution reaches the eutectic point or only a small amount of stock solution remains, the stock solution or the residual small amount of stock solution reaching the eutectic point is conveyed to the mother solution storage tank 310 as mother solution through the mother solution pump 360, then enters an deicing mode, and the clean water of the storage tank after deicing is recycled through the pump or is used as water for next-stage treatment.
It should be noted that, in the pipeline of the ice crystal generator 120, each heat exchange tube is provided with a centrifugal stirring ice scraping rod, all stirring rods are driven by the same motor, and ice crystals crystallized on the inner wall of the heat exchange tube are scraped off in time, so that the inner wall of the heat exchange tube is prevented from being frozen to influence heat exchange and block the heat exchange tube. In addition, a plurality of electrically operated valves are connected to the tank a130, the tank B140 or the tank C150, and each tank assumes different functions at different times according to the opening and closing of the valves.
2. Ice melting unit
After the ice making stage treatment, when the eutectic point in the storage tank is reached or a small amount of concentrated mother liquor stock solution remains, the mother liquor stock solution is sent to the mother liquor storage tank 310 through the mother liquor pump 360; the rest ice crystals are sent into the heat exchange tube of the shell-and-tube condenser 220 by the ice melting circulating pump 210, and the ice is crystallized into clear water which returns to the ice crystal storage tank until the ice crystals are completely melted, and the melted relatively clean water is reused or used as water for the next-stage treatment.
3. Evaporation crystallization unit
Mother liquor with the stock solution reaching the eutectic point or the mother liquor after the stock solution is sufficiently concentrated is sent to a mother liquor storage tank 310, the mother liquor is sent to the outside of a spiral of a mother liquor crystallizer 330 through a mother liquor booster pump 320, a cavity where the mother liquor is positioned is connected with an inlet of a vacuum pump 240, the mother liquor is evaporated at a low temperature (the lowest temperature can reach 35 ℃) in the crystallizer under the action of negative pressure, evaporated vapor is sucked into a condenser 220 by the vacuum pump 240, the vapor is condensed into water in the condenser 220 and then is discharged and recycled through the bottom of the condenser 220 or is used as water for lower treatment, and noncondensable gas and a small amount of noncondensable vapor are discharged through the vacuum pump 240.
4. Heat pump unit
The refrigerant is pressurized by the heat pump compressor 410 and then becomes high-temperature high-pressure gas, the high-temperature high-pressure gas is sent to the mother liquor crystallizer 330 through a conveying pipeline, the refrigerant is cooled into high-temperature high-pressure liquid in the crystallizer by heat release, the liquid refrigerant is throttled and expanded by the expansion valve 420 and then becomes low-temperature low-pressure gas-liquid mixture to be sent to the ice crystal generator 120, and the refrigerant absorbs heat in the ice crystal generator 120 and is completely evaporated into low-temperature low-pressure gas and then is conveyed to the air suction end of the heat pump compressor 410 through the pipeline for recycling.
The heat pump compressor 410 may be a scroll compressor, a screw compressor, a centrifugal compressor, a piston compressor, or the like. The refrigerant adopts a conventional refrigerant such as R22, R134a and R410 or a mixed refrigerant composed of common refrigerants, and the R22 refrigerant is preferred. The expansion valve 420 is a thermal expansion valve or an electronic expansion valve, preferably an electronic expansion valve. The ice crystal generator 120 is a shell and tube heat exchanger in which the refrigerant passes through a shell side and the ice making stock solution passes through a tube side. The shell material is carbon steel, and the heat exchange tube material is copper, stainless steel, copper-nickel alloy, dual-phase steel, titanium alloy and other corrosion resistant materials. The mother liquor crystallizer 330 is in the form of a hollow spiral with a sealed shell, the refrigerant is led to the inside of the hollow spiral, the material is preferably corrosion-resistant materials such as stainless steel, dual-phase steel and the like, and the spiral is provided with an outer scraper to prevent scaling and impurity accumulation from affecting the heat exchange effect.
The utility model fully utilizes the cold source and the heat source of the heat pump technology, the cold source is used for making ice and pre-concentrating pollutants in the process of making ice, and the heat source is used for evaporating and crystallizing the concentrated mother liquor, so that the energy consumption can be greatly reduced; the heat pump refrigerating end (ice crystal generator) cools and cools the raw liquid for wastewater treatment to generate ice crystals, the ice crystals have natural exclusivity in the formation process to generate purer water in a solid state, the water and pollutants are further separated and concentrated through solid-liquid separation, the purer water is recycled after simple treatment or discharged after reaching standards, mother liquor after freezing and crystallization is sent to the heat pump refrigerating end (mother liquor crystallizer), the mother liquor is evaporated at low temperature in a negative pressure vacuum state, and the thorough separation of the pollutants and the water is finally realized, so that the wastewater is purified.
The utility model has been described in detail hereinabove with reference to specific exemplary embodiments thereof. It will be understood that various modifications and changes may be made without departing from the scope of the utility model as defined by the appended claims. The detailed description and drawings are to be regarded in an illustrative rather than a restrictive sense, and if any such modifications and variations are desired to be included within the scope of the utility model described herein. Furthermore, the background art is intended to illustrate the status and meaning of the development of the technology and is not intended to limit the utility model or the application and field of application of the utility model.
Claims (10)
1. A wastewater treatment system for freezing concentration coupling negative pressure vacuum evaporation crystallization is characterized in that: the ice-making device comprises an ice-making unit, an ice-melting unit, an evaporation crystallization unit and a heat pump unit, wherein the ice-making unit comprises an ice crystal generator (120), a storage tank A (130), a storage tank B (140) and a storage tank C (150), the ice crystal generator (120) is connected with the storage tank A (130), the storage tank B (140) and the storage tank C (150) through pipelines, and an ice-making circulating pump (110) is arranged on the pipeline connecting the ice crystal generator (120) with the storage tank A (130), the storage tank B (140) and the storage tank C (150);
the deicing unit comprises a gas condenser (220), a storage tank A (130), a storage tank B (140) and a storage tank C (150), wherein the gas condenser (220) is connected with the storage tank A (130), the storage tank B (140) and the storage tank C (150) through pipelines, and a deicing circulating pump (210) is arranged on the pipelines of the gas condenser (220) connected with the storage tank A (130), the storage tank B (140) and the storage tank C (150);
the evaporation crystallization unit comprises a mother liquor storage tank (310), a mother liquor crystallizer (330) and a condenser (220), wherein the mother liquor storage tank (310) is connected with the mother liquor crystallizer (330) through a pipeline, the mother liquor crystallizer (330) is connected with the condenser (220) through a pipeline, the mother liquor storage tank (310) is connected with a storage tank A (130), a storage tank B (140) and a storage tank C (150) through a pipeline,
the heat pump unit comprises a heat pump compressor (410), a mother liquor crystallizer (330) and an ice crystal generator (120), wherein the heat pump compressor (410) is connected with the mother liquor crystallizer (330) through a pipeline, the mother liquor crystallizer (330) is connected with the ice crystal generator (120) through a pipeline, and an expansion valve (420) is arranged on the pipeline connecting the mother liquor crystallizer (330) with the ice crystal generator (120).
2. The wastewater treatment system for freeze concentration coupled negative pressure vacuum evaporation crystallization according to claim 1, wherein: a mother liquor pump (360) is arranged on the pipeline of the mother liquor storage tank (310) connected with the storage tank A (130), the storage tank B (140) and the storage tank C (150).
3. The wastewater treatment system for freeze concentration coupled negative pressure vacuum evaporation crystallization according to claim 1, wherein: a mother liquor booster pump (320) is arranged on a pipeline between the mother liquor storage tank (310) and the mother liquor crystallizer (330).
4. The wastewater treatment system for freeze concentration coupled negative pressure vacuum evaporation crystallization according to claim 1, wherein: the air condenser (220) is connected with a clean water pipeline, and a condensate pump (230) is arranged on the clean water pipeline.
5. The wastewater treatment system for freeze concentration coupled negative pressure vacuum evaporation crystallization according to claim 1, wherein: the condenser (220) is connected with an exhaust pipeline, and a vacuum pump (240) is arranged on the exhaust pipeline.
6. The wastewater treatment system for freeze concentration coupled negative pressure vacuum evaporation crystallization according to claim 1, wherein: the bottom of the mother liquor crystallizer (330) is provided with a residue port (3310), and the mother liquor crystallizer (330) is connected with a residue collecting pipeline through the residue port (3310).
7. The wastewater treatment system for freeze concentration coupled negative pressure vacuum evaporation crystallization according to claim 1, wherein: the top of the storage tank A (130) is provided with a first wastewater stock solution inlet, and the bottom of the storage tank A (130) is provided with a first ice making outlet, a first ice melting outlet and a first mother solution outlet.
8. The wastewater treatment system for freeze concentration coupled negative pressure vacuum evaporation crystallization according to claim 1, wherein: a second wastewater stock solution inlet is formed in the top of the storage tank B (140); the bottom of the storage tank B (140) is provided with a second ice making outlet, a second ice melting outlet and a second mother liquor outlet.
9. The wastewater treatment system for freeze concentration coupled negative pressure vacuum evaporation crystallization according to claim 1, wherein: the top of the storage tank C (150) is provided with a third three-waste-water raw liquid inlet, and the bottom of the storage tank C (150) is provided with a third ice making outlet, a third ice melting outlet and a third mother liquid outlet.
10. A wastewater treatment system for freeze concentration coupled negative pressure vacuum evaporation crystallization according to any one of claims 1-9, wherein: the volumes of the storage tank A (130), the storage tank B (140) and the storage tank C (150) are the same.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320175513.0U CN219217619U (en) | 2023-02-02 | 2023-02-02 | Wastewater treatment system for freezing concentration coupling negative pressure vacuum evaporation crystallization |
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| CN202320175513.0U CN219217619U (en) | 2023-02-02 | 2023-02-02 | Wastewater treatment system for freezing concentration coupling negative pressure vacuum evaporation crystallization |
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