CN111646619A - High-efficiency energy-saving sewage freezing and concentrating device and treatment process thereof - Google Patents
High-efficiency energy-saving sewage freezing and concentrating device and treatment process thereof Download PDFInfo
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- CN111646619A CN111646619A CN202010712318.8A CN202010712318A CN111646619A CN 111646619 A CN111646619 A CN 111646619A CN 202010712318 A CN202010712318 A CN 202010712318A CN 111646619 A CN111646619 A CN 111646619A
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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
- C02F1/22—Treatment of water, waste water, or sewage by freezing
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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
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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
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
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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
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/002—Construction details of the apparatus
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Abstract
The invention discloses a high-efficiency energy-saving sewage freezing concentration device and a treatment process thereof, wherein the treatment process comprises the following steps: the plate ice machine comprises a water inlet, a concentrated solution outlet, an ice outlet and a refrigerant condensate circulation loop, the ice outlet is communicated with the ice water tank, a high-pressure pump is arranged between the ice water tank and the membrane filter, the membrane filter comprises a purified water outlet and a loop outlet, the loop outlet is communicated with the water inlet of the plate ice machine, the concentrated solution outlet of the plate ice machine is provided with a liquid discharge pump, the sewage concentrated solution of the plate ice machine is discharged through the liquid discharge pump, the ice water tank is located in the refrigerant condensate circulation loop, and the refrigerant condensate circulation loop is used for exchanging heat between ice blocks in the ice water tank and a refrigerant. The invention adopts the plate ice making, purifying and laminating membrane filtering composite sewage purifying technology and the technology that the condensate of the condenser refrigerant is cooled by the heat exchange of the ice water tank and the ice water to improve the supercooling degree of the liquid refrigerant, has good sewage purifying effect, improves the ice making efficiency, and has low energy consumption and investment cost.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a high-efficiency energy-saving sewage freezing and concentrating device and a treatment process thereof.
Background
The existing wastewater treatment technologies have corresponding characteristics, evaporation concentration is commonly adopted for sewage which is difficult to treat at present, an electric/gas/coal boiler evaporation device is also commonly adopted at home and abroad, and due to high operation temperature, high steam pressure and high requirements on corrosion resistance and pressure resistance of equipment materials, pressure-resistant operation is required, and pressure-bearing equipment is very expensive; the coal boiler evaporation concentration device is basically eliminated or eliminated due to serious environmental pollution; the evaporation and concentration device of the gas heating boiler is not applied much at present due to the safety and the economical efficiency. Therefore, the electric heating concentration device is increasingly used in consideration of convenience and environmental protection. The energy consumption of the single-stage electric boiler is very high, even if multi-stage evaporation is adopted, the energy consumption per ton of water of the evaporation and concentration device of the electric boiler is still about 200-300kwh, the equipment investment of the evaporation and concentration device of the electric boiler is high, and the energy consumption is still high. For an MVR vapor compression evaporation concentration system, the requirement on equipment is high, the technological process is complex, particularly, the MVR vapor compressor is extremely expensive, and the investment cost of the system is very high and is almost 3 times of that of boiler evaporation concentration equipment. For a heat pump low-temperature vacuum evaporation concentration system, the energy consumption per ton of water is still high and reaches 200kwh, and the process has vacuum pressure-bearing equipment, so that the equipment is expensive and the investment cost is high. In the prior art, a heat pump is adopted to evaporate, dehumidify and concentrate sewage, the sewage can be evaporated and concentrated at low temperature and normal pressure, the equipment requirement is low, the investment is low, and the energy consumption per ton of water can be reduced to about 200kwh due to the 3-4 times of energy efficiency improvement effect of the heat pump, but the energy consumption is still high.
At present, the research of freeze concentration is carried out on sewage which is difficult to treat, the sewage is subjected to low-temperature freeze treatment, water in the sewage is condensed into ice blocks, the ice is monomineralite and cannot coexist with other substances, so that impurities can be automatically removed from the water in the crystallization process to keep the water pure, substances with different components can be effectively separated, the dehydration concentration treatment is carried out on the substances, the advantage of the freezing technology lies in that the sewage is concentrated under the conditions of normal pressure, low temperature and low energy consumption, and the freezing technology cannot generate secondary pollution to the environment. Because the static freeze concentration has the problems of poor purification effect of raw liquid entrainment (only about 90 percent of purification rate can be achieved) and high energy consumption (about 100kwh of water energy consumption per ton), most freeze concentration projects are researching the dynamic freeze concentration technology, but the dynamic freeze concentration needs ice crystal crystallization, ice crystal separation and ice crystal washing processes, and has the outstanding problems of complex flow, high equipment requirement, high investment, high energy consumption (more than 100kwh of water energy consumption per ton) and high sewage treatment cost, so that the static freeze concentration is difficult to be widely applied to the sewage treatment field at present.
Therefore, it is necessary to provide an efficient and energy-saving sewage freeze concentration device and a treatment process thereof to solve the above problems.
Disclosure of Invention
One of the purposes of the invention is to provide an efficient and energy-saving sewage freezing and concentrating device, which has the advantages of low energy consumption, simple operation, automation degree, realization of standardized production, great investment and operation cost saving, and solving the problems of large equipment investment, high energy consumption, complex separation process, high equipment requirement, poor conventional static freezing, concentrating and purifying effects and the like in the prior art.
The invention provides a high-efficiency energy-saving sewage freezing and concentrating device, which comprises: the plate ice machine comprises a water inlet, a concentrated solution outlet, an ice outlet and a refrigerant condensate circulation loop, the ice outlet is communicated with the ice water tank, a high-pressure pump is arranged between the ice water tank and the membrane filter, the membrane filter comprises a purified water outlet and a loop outlet, the loop outlet is communicated with the water inlet of the plate ice machine, the concentrated solution outlet of the plate ice machine is provided with a liquid discharge pump, the sewage concentrated solution of the plate ice machine is discharged through the liquid discharge pump, the ice water tank is located in the refrigerant condensate circulation loop, and the refrigerant condensate circulation loop is used for exchanging heat between ice blocks in the ice water tank and a refrigerant.
Further, the plate ice machine further comprises a sewage circulating system and an ice making system, wherein the sewage circulating system comprises a circulating groove and a circulating pump which are arranged in the plate ice machine, and sewage in the circulating groove is made into ice through circulation through the circulating pump.
Furthermore, the ice making system comprises an ice maker, a compressor, a condenser and an expansion valve, wherein the compressor is communicated with the condenser, the expansion valve, a refrigerant condensate circulation loop and an ice maker pipeline, the refrigerant condensate circulation loop is arranged between the condenser and the expansion valve, and the refrigerant condensate circulation loop is fixed on the outer wall of the ice water tank by adopting brazing.
Further, the condenser may be an air-cooled condenser or a water-cooled condenser.
Furthermore, the membrane filter can adopt a ceramic membrane and a reverse osmosis membrane according to the characteristics of sewage, and can also adopt a series combination mode of the ceramic membrane and the reverse osmosis membrane.
Further, the device also comprises a controller, wherein the controller is respectively electrically connected with the plate ice machine, the high-pressure pump, the liquid discharge pump and the membrane filter.
The second purpose of the invention is to provide a high-efficiency energy-saving sewage freezing and concentrating treatment process, which comprises the following steps: feeding sewage, making ice by a plate ice machine, exchanging heat and cooling the ice water, and performing membrane filtration and composite purification.
Further, the steps specifically include: the sewage enters an ice plate machine to form ice blocks, the ice blocks and the unfrozen concentrated solution are separated, and the concentrated solution in the ice plate machine is discharged through a liquid discharge pump; and (3) the ice blocks enter an ice water tank to exchange heat with a refrigerant circulation loop and then are filtered by a membrane filter, the filtered purified water is discharged when the water quality reaches the discharge standard, the residual concentrated residual liquid returns to the plate ice machine through a loop outlet, and the loop return liquid repeats the steps again to perform ice making purification.
Further, the fed sewage can be sewage stock solution or concentrated sewage after membrane treatment.
Further, the ice making process specifically includes that feeding sewage enters an internal circulation tank of the plate ice maker, a circulation pump in the plate ice maker enables the sewage to be sprayed from the surface of the ice maker, ice is continuously made and removed from the surface of the ice maker, the removed ice is broken on a screen plate in the ice maker and separated from the sewage, the broken ice enters an ice water tank, and residual sewage concentrated solution in the internal circulation tank of the plate ice maker is discharged by a liquid discharge pump after reaching a set concentration.
Further, the ice water heat exchange cooling process is realized through a refrigerant condensate circulation loop of the plate ice machine, the ice machine is used as an evaporator of the plate ice machine, liquid refrigerants of an ice making system are evaporated and absorb heat in the ice machine to be low-temperature gaseous refrigerants, the low-temperature gaseous refrigerants are pressurized to be high-temperature gaseous refrigerants through a compressor, the high-temperature gaseous refrigerants enter a condenser to release heat and liquefy, the liquid refrigerants discharged from the condenser are subjected to heat exchange with ice water through an ice water tank to be supercooled liquid refrigerants with high supercooling degree, and the supercooled liquid refrigerants passing through the ice water tank are throttled to enter the evaporator to be evaporated and circulated.
According to the efficient energy-saving sewage freezing and concentrating device and the treatment process, the technology of plate ice making, purifying, laminating, membrane filtering and composite sewage purifying is adopted, the purifying rate of sewage can reach about 90%, ice in an ice water tank is melted and then is pressed into a membrane filter through a high-pressure pump to be further and deeply purified to obtain high-standard purified water, and the purified water is purified through the ice making process, so that the applicability of the membrane filter is improved, the purifying efficiency is improved, the maintenance period is greatly prolonged, and the service life is prolonged. The supercooling degree of the liquid refrigerant of the ice making system is improved by cooling the condensate of the condenser refrigerant of the plate ice machine through an ice water tank, the supercooling degree can be improved from about 5 ℃ to about 35 ℃, and the supercooled liquid refrigerant with high supercooling degree can greatly improve the ice making efficiency, obviously reduce the energy consumption and reduce the energy consumption of ice making by about 25%.
Drawings
FIG. 1 is a schematic diagram of the structure of the device of the present invention.
In the figure, an ice plate maker-1, an ice water tank-2, a membrane filter-3, a liquid discharge pump-4, a refrigerant condensate circulation loop-5, a high-pressure pump-6 and a liquid return loop-7.
Detailed Description
In a first embodiment, the present invention provides an energy-efficient sewage freezing and concentrating apparatus, as shown in fig. 1, the apparatus includes: the plate ice machine comprises a plate ice machine 1, an ice water tank 2, a membrane filter 3 and a liquid discharge pump 4, wherein the plate ice machine comprises a water inlet, a concentrated liquid outlet, an ice outlet and a refrigerant condensate circulation loop 5, the ice outlet is communicated with the ice water tank, a high-pressure pump 6 is arranged between the ice water tank and the membrane filter, the membrane filter comprises a purified water outlet and a loop outlet, the loop outlet is communicated with the water inlet of the plate ice machine through a liquid return loop 7, the concentrated liquid outlet of the plate ice machine is provided with the liquid discharge pump, the sewage concentrated liquid of the plate ice machine is discharged through the liquid discharge pump, the ice water tank is located in the refrigerant condensate circulation loop, and the refrigerant condensate circulation loop is used for heat exchange between.
The plate ice machine of this embodiment still includes sewage circulating system, ice making system, sewage circulating system includes the inside circulation groove that sets up of plate ice machine, the circulating pump, ice making system includes the ice maker, the compressor, the condenser, the expansion valve, refrigerant condensate circulation return circuit, ice maker pipeline intercommunication, there is refrigerant condensate circulation return circuit between condenser and the expansion valve, refrigerant condensate circulation return circuit adopts the brazing to be fixed in frozen water groove outer wall, the circulating pump lets the sewage in the circulation groove spray to the ice maker surface, ice grows on the ice maker surface, unnecessary sewage flows into the circulation groove, the circulation system ice, plate ice machine can adopt current equipment, its concrete structure is no longer repeated here for prior art.
The condenser of the embodiment can be an air-cooled condenser or a water-cooled condenser.
The membrane filter of the embodiment can adopt a ceramic membrane and a reverse osmosis membrane according to the sewage characteristics, and can also adopt a series combination mode of the ceramic membrane and the reverse osmosis membrane and the like.
The device of the embodiment further comprises a controller, wherein the controller is electrically connected with the plate ice machine, the high-pressure pump, the liquid discharge pump and the membrane filter respectively, and automation of the device is achieved.
The refrigerant condensate circulation loop of the embodiment is arranged on the outer wall of the ice water tank in a spiral winding mode.
Example 2: an energy-efficient sewage freeze concentration treatment process uses the sewage freeze concentration device of embodiment 1, and comprises the following steps:
the sewage enters an ice plate machine to form ice blocks, the ice blocks and the unfrozen concentrated solution are separated, and the concentrated solution in the ice plate machine is discharged through a liquid discharge pump; and (3) the ice blocks enter an ice water tank to exchange heat with a refrigerant circulation loop and then are filtered by a membrane filter, the filtered purified water is discharged when the water quality reaches the discharge standard, the residual concentrated residual liquid returns to the plate ice machine through a loop outlet, and the loop return liquid repeats the steps again to perform ice making purification.
The fed sewage of this example may be a raw sewage or a concentrated sewage after membrane treatment.
The feeding sewage enters the internal circulation groove of the plate ice machine, the circulating pump in the plate ice machine allows the sewage to be sprayed from the surface of the ice maker, ice is continuously made and deiced from the surface of the ice maker, the deiced ice is broken on the mesh plate in the ice maker and is separated from the sewage, the broken ice enters the ice water tank, and the residual sewage concentrated solution in the internal circulation groove of the plate ice machine is discharged by the liquid discharge pump.
The ice maker is an evaporator of the plate ice maker, liquid refrigerant of an ice making system is evaporated and absorbs heat in the ice maker to be low-temperature gaseous refrigerant, the low-temperature gaseous refrigerant is pressurized by a compressor to be high-temperature gaseous refrigerant, the high-temperature gaseous refrigerant enters a condenser to be released and liquefied, the liquid refrigerant coming out of the condenser is subjected to heat exchange with ice water through an ice water tank to be supercooled liquid refrigerant with high supercooling degree, the supercooling degree can be increased to about 35 ℃ from about 5 ℃, the supercooled liquid refrigerant with high supercooling degree can greatly improve ice making efficiency and reduce ice making energy consumption by about 25%, and the supercooled liquid refrigerant enters the ice maker of the plate ice maker through an expansion valve in a throttling mode to be evaporated and circulated.
Compared with the electric boiler evaporation concentration/MVR vapor compression evaporation concentration/heat pump low-temperature vacuum evaporation concentration device, the device and the treatment process disclosed by the embodiments 1 and 2 of the invention have the advantages that the cost can be greatly reduced by about 90-40%;
compared with the ton water evaporation energy consumption of about 250kwh of a conventional heat pump evaporation, dehumidification and concentration device, the high-efficiency and energy-saving sewage freezing and concentration technology can reach the ton water evaporation energy consumption of about 75kwh, the energy consumption can be greatly reduced by about 70%, and more energy and money are saved;
compared with the ton water evaporation energy consumption of about 100kwh of a static freezing concentration technology, the high-efficiency energy-saving sewage freezing concentration technology can reach the ton water evaporation energy consumption of about 75kwh, the energy consumption can be greatly reduced by about 25%, the energy is saved, the money is saved, and the purification rate is high;
compared with the ton water evaporation energy consumption of about 100kwh of the dynamic freezing concentration technology, the high-efficiency energy-saving sewage freezing concentration technology can reach the ton water evaporation energy consumption of about 75kwh, the energy consumption can be greatly reduced by more than 25%, the energy is saved, the purifying effect is good, the energy consumption is low, and the investment cost is low.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. The utility model provides a high-efficient energy-conserving sewage freeze concentration device which characterized in that, the device includes: the plate ice machine comprises a water inlet, a concentrated solution outlet, an ice outlet and a refrigerant condensate circulation loop, the ice outlet is communicated with the ice water tank, a high-pressure pump is arranged between the ice water tank and the membrane filter, the membrane filter comprises a purified water outlet and a loop outlet, the loop outlet is communicated with the water inlet of the plate ice machine, the concentrated solution outlet of the plate ice machine is provided with a liquid discharge pump, the sewage concentrated solution of the plate ice machine is discharged through the liquid discharge pump, the ice water tank is located in the refrigerant condensate circulation loop, and the refrigerant condensate circulation loop is used for exchanging heat between ice blocks in the ice water tank and a refrigerant.
2. The efficient energy-saving sewage freezing and concentrating device according to claim 1, wherein the plate ice machine further comprises a sewage circulating system and an ice making system, the sewage circulating system comprises a circulating tank and a circulating pump which are arranged inside the plate ice machine, the ice making system comprises an ice maker, a compressor, a condenser and an expansion valve, the compressor is communicated with the condenser, the expansion valve, a refrigerant condensate circulating loop and an ice maker pipeline, the refrigerant condensate circulating loop is arranged between the condenser and the expansion valve and fixed on the outer wall of the ice water tank by brazing, and sewage in the circulating tank is sprayed by the circulating pump to make ice.
3. The energy-efficient sewage freeze concentration device according to claim 2, wherein the condenser is an air-cooled condenser or a water-cooled condenser.
4. The energy-efficient sewage freeze concentration device according to claim 3, wherein the membrane filter is a ceramic membrane or a reverse osmosis membrane or a combination of a ceramic membrane and a reverse osmosis membrane in series.
5. The apparatus as claimed in claim 4, wherein the coolant condensate circulation circuit is disposed on the outer wall of the ice water tank in a spiral manner.
6. A sewage freezing and concentrating treatment process is characterized by comprising the following steps: feeding sewage, making ice by a plate ice machine, exchanging heat and cooling the ice water, and performing membrane filtration and composite purification.
7. The sewage freezing and concentrating treatment process according to claim 6, characterized by comprising the following steps: the sewage enters an ice plate machine to form ice blocks, the ice blocks and the unfrozen concentrated solution are separated, and the concentrated solution in the ice plate machine is discharged through a liquid discharge pump; and (3) the ice blocks enter an ice water tank to exchange heat with a refrigerant circulation loop and then are filtered by a membrane filter, the filtered purified water is discharged when the water quality reaches the discharge standard, the residual concentrated residual liquid returns to the plate ice machine through a loop outlet, and the loop return liquid repeats the steps again to perform ice making purification.
8. The process of claim 7, wherein the waste water is a raw waste water or a concentrated waste water after membrane treatment.
9. The sewage freezing and concentration treatment process according to claim 8, wherein the ice making process is that the feeding sewage enters an internal circulation tank of the plate ice maker, a circulation pump in the plate ice maker allows the sewage to be sprayed from the surface of the ice maker, ice is continuously made and removed from the surface of the ice maker, the removed ice is broken on a screen plate in the ice maker and separated from the sewage, the broken ice enters an ice water tank, and the residual sewage concentrated solution in the internal circulation tank of the plate ice maker is discharged by a liquid discharge pump.
10. The sewage freezing and concentration treatment process according to claim 9, wherein the ice water heat exchange and cooling process is realized by a refrigerant circulation system of the plate ice machine, liquid refrigerants of the ice making system are evaporated and absorb heat in the ice maker to be low-temperature gaseous refrigerants, the low-temperature gaseous refrigerants are pressurized to be high-temperature gaseous refrigerants by a compressor, the high-temperature gaseous refrigerants enter a condenser to release heat and liquefy, the liquid refrigerants from the condenser are subjected to heat exchange with ice water through an ice water tank to be super-cooled liquid refrigerants with high super-cooling degree, and the liquid refrigerants which are super-cooled by the ice water tank are throttled by an expansion valve to enter the ice maker.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010712318.8A CN111646619A (en) | 2020-07-22 | 2020-07-22 | High-efficiency energy-saving sewage freezing and concentrating device and treatment process thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010712318.8A CN111646619A (en) | 2020-07-22 | 2020-07-22 | High-efficiency energy-saving sewage freezing and concentrating device and treatment process thereof |
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| CN111646619A true CN111646619A (en) | 2020-09-11 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112624245A (en) * | 2020-12-30 | 2021-04-09 | 南京都乐制冷设备有限公司 | High salt waste water freeze concentration separation processing apparatus |
| CN113213682A (en) * | 2020-12-30 | 2021-08-06 | 南京都乐制冷设备有限公司 | High-salinity wastewater treatment method |
| JP7093443B1 (en) * | 2021-04-16 | 2022-06-29 | 新日本空調株式会社 | Freeze concentration method |
-
2020
- 2020-07-22 CN CN202010712318.8A patent/CN111646619A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112624245A (en) * | 2020-12-30 | 2021-04-09 | 南京都乐制冷设备有限公司 | High salt waste water freeze concentration separation processing apparatus |
| CN113213682A (en) * | 2020-12-30 | 2021-08-06 | 南京都乐制冷设备有限公司 | High-salinity wastewater treatment method |
| JP7093443B1 (en) * | 2021-04-16 | 2022-06-29 | 新日本空調株式会社 | Freeze concentration method |
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