CN216808479U - Sewage treatment system with freezing evaporation combined concentration - Google Patents
Sewage treatment system with freezing evaporation combined concentration Download PDFInfo
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- CN216808479U CN216808479U CN202220343202.6U CN202220343202U CN216808479U CN 216808479 U CN216808479 U CN 216808479U CN 202220343202 U CN202220343202 U CN 202220343202U CN 216808479 U CN216808479 U CN 216808479U
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Abstract
The utility model provides a sewage treatment system with freezing evaporation combined concentration, which comprises a sewage freezing treatment unit, a sewage evaporation treatment unit and a refrigerant loop unit, wherein the sewage evaporation treatment unit comprises an evaporation and condensation branch and an evaporation and cooling loop, a refrigerant is recycled in the refrigerant loop unit, and the refrigerant loop unit is used for recycling cold and heat sources of the refrigerant. The operation difficulty of setting multiple heat sources is reduced, the equipment manufacturing process is simplified, and meanwhile, the operation and equipment cost is greatly saved.
Description
Technical Field
The utility model relates to the technical field of sewage treatment systems, in particular to a sewage treatment system with freezing and evaporation combined concentration.
Background
At present, the sewage which is difficult to treat is generally evaporated and concentrated, and an electric, gas and coal boiler evaporation device is generally adopted at home and abroad, because the operation temperature is high, the steam pressure is large, the corrosion resistance and pressure resistance requirements of equipment materials are high, pressure-resistant operation is required, and pressure-bearing equipment is 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. Due to the consideration of convenience and environmental protection, the application of the electric heating concentration device is increased at present, but the energy consumption of a single-stage electric boiler is very high, even if multi-stage evaporation is adopted, the energy consumption per ton of water of the electric boiler evaporation concentration device is still about 200-300 kwh, the equipment investment of the electric boiler evaporation concentration device is high, and the energy consumption is still high. For an MVR vapor compression evaporation concentration system, even if multi-stage evaporation concentration is adopted, the energy consumption of each ton of water is still as high as 200kwh, the process is complex, the equipment requirement is high, and the investment cost is high.
For a heat pump low-temperature vacuum evaporation concentration system, the energy consumption of each ton of water is still as high as 200kwh, and the process has vacuum pressure-bearing equipment, so that the equipment is expensive and the investment cost is high. The sewage is evaporated, dehumidified and concentrated by adopting the heat pump, 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 of sewage difficult to treat is more, because static freeze concentration has poor purification effect of raw liquid entrainment, the highest purification rate can only reach about 90 percent generally, the energy consumption is higher, and generally, the energy consumption of each ton of water is about 100kwh, most of freeze concentration projects are researching dynamic freeze concentration technology, but the dynamic freeze concentration needs ice crystal crystallization, ice crystal separation and ice crystal washing processes, has the technical defects of complex flow, high equipment requirement, large investment, higher energy consumption and the like, and the energy consumption of each ton of water is more than 100kwh, the sewage treatment cost is high, and the dynamic freeze concentration technology is difficult to be widely applied in the field of sewage treatment at present.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a freezing and evaporating combined concentration sewage treatment system, which adopts a sewage freezing treatment unit concentration technology of ice making by a plate ice machine to be superposed with a sewage evaporating treatment unit concentration technology, has high concentration efficiency and high concentration ratio, and the sewage freezing treatment unit concentration technology and a cold and heat source for evaporating treatment concentration are shared, thereby not only reducing the configuration of a heat pump, but also reducing the consumption of evaporating energy and obviously reducing the energy consumption for sewage concentration.
In order to achieve the above purpose, the utility model provides the following technical scheme: a sewage treatment system with freezing and evaporation combined concentration comprises a sewage freezing treatment unit, a sewage evaporation treatment unit and a refrigerant loop unit, wherein the refrigerant loop unit comprises an ice plate machine, a water-cooled condenser, an air-cooled condenser and an ice plate machine which are sequentially connected through pipelines; the refrigerant is recycled in the refrigerant loop unit, and the parts of refrigerant channels formed by the refrigerant passing through the plate ice machine in sequence comprise expansion valves, wherein the expansion valves throttle high-temperature and high-pressure liquid refrigerants from the air-cooled condenser into low-temperature and low-pressure liquid refrigerants; the compressor compresses low-temperature and low-pressure gaseous refrigerants flowing out of the ice maker into high-temperature and high-pressure gaseous refrigerants; the high-temperature high-pressure gaseous refrigerant sequentially enters the water-cooling condenser and the air-cooling condenser to be liquefied and converted into a low-temperature low-pressure liquid refrigerant, the low-temperature low-pressure liquid refrigerant returns through the expansion valve again and flows into the ice maker to be recycled, and the refrigerant loop unit is used for recycling cold and heat sources of the refrigerant.
Further, the sewage freezing treatment unit comprises an ice plate maker, an ice water tank, a high-pressure pump, a membrane filter and a purified water tank which are sequentially connected; the interior of the plate ice machine also comprises a circulating groove, and the circulating groove is used for storing ice making circulating liquid; the circulating pump is used for extracting ice-making circulating liquid from the circulating tank and spraying the ice-making circulating liquid on the outer surface of the ice maker through a pipeline, and the circulating pump is used for circulating sewage during ice making; spraying water from the outer surface of the ice maker to make ice, and purifying the ice; the sewage freezing treatment unit is used for circulating sewage to make ice in the ice maker, separating ice making circulating liquid which is not made into ice from ice blocks which are formed into ice to remove dirt, melting the ice blocks which are formed into ice in the ice water tank, pressurizing the ice blocks by a high-pressure pump, enabling the ice blocks to enter a membrane filter to be filtered into purified water, and discharging the purified water into a purified water tank.
Furthermore, the sewage evaporation treatment unit comprises an evaporation heating loop, and the evaporation heating loop comprises a water-cooled condenser, an evaporation kettle, an evaporation circulating pump and a water-cooled condenser which are sequentially connected; the evaporation heating loop is used for evaporation separation and purification after ice-making waste liquid which is not made into ice enters the water-cooled condenser, the evaporation kettle, the evaporation circulating pump and the water-cooled condenser for repeated circulation heating.
Furthermore, the evaporation kettle of the sewage evaporation treatment unit is also connected with a concentrated solution discharge branch, and the concentrated solution discharge branch comprises an evaporation kettle, a liquid discharge pump and a concentrated solution pool; and the concentrated solution discharge branch is used for discharging the highly concentrated solution which reaches the specified concentration through the evaporation heating loop into a concentrated solution pool through a liquid discharge pump.
Furthermore, the sewage evaporation treatment unit also comprises an evaporation and condensation branch, and the evaporation and condensation branch comprises a cooler, a drainage pump and a purified water tank which are sequentially connected; the evaporation and condensation branch unit is used for collecting steam in the evaporation kettle, condensing the steam into purified water after the steam enters the cooler, and discharging the purified water into the purified water tank through the drainage pump.
Furthermore, the sewage evaporation treatment unit also comprises an evaporation cooling loop, and the evaporation cooling loop comprises a cooler, an ice water tank, an ice water circulating pump and a cooler which are sequentially connected; the evaporative cooling loop is used for absorbing heat of steam in the condensation branch in the cooler by circulating sewage and releasing heat when water in the ice water tank is condensed into ice.
Furthermore, the sewage treatment system also comprises a liquid return loop, wherein the liquid return loop comprises an ice plate maker, an ice water tank, a high-pressure pump, a membrane filter and a sewage main pipeline which are sequentially connected; and a small amount of concentrated residual liquid is left after the circulating sewage or the sewage stock solution is filtered by a membrane filter of the sewage freezing treatment unit, returns to the plate ice maker through a liquid return loop, and is circulated from the plate ice maker again to enter the sewage freezing treatment unit or the sewage evaporation treatment unit.
Further, the sewage evaporation treatment unit further comprises a vacuum pump, the vacuum pump is coupled with the evaporation kettle, and the vacuum pump is used for exhausting gas from the evaporation system to the atmosphere environment to maintain the vacuum degree of the evaporation system.
Further, the sewage evaporation treatment unit further comprises a pressure gauge, the pressure gauge is fixedly connected with the evaporation kettle, and the pressure gauge is used for monitoring the air pressure in the evaporation kettle.
Further, the sewage evaporation treatment unit is still including the thermometer, the thermometer with the evaporation kettle is fixed connection, the thermometer is used for monitoring the temperature in the evaporation kettle.
The analysis shows that the utility model discloses a sewage treatment system with freezing and evaporation combined concentration, which has the following technical effects:
1. the sewage treatment system disclosed by the utility model adopts an evaporation concentration technology that the sewage freezing treatment unit is superposed with the sewage evaporation treatment unit, so that the concentration ratio and the concentration efficiency are obviously improved.
2. The sewage treatment system disclosed by the utility model adopts a plate ice making, concentrating, superposing, evaporating and concentrating technology, and cold and heat source refrigerant heat of the ice making concentrated sewage stock solution and the evaporated and concentrated sewage stock solution is shared, so that multiple configurations of a heat pump are reduced, the evaporation energy consumption is reduced, and the sewage concentration energy consumption is obviously reduced.
3. The sewage treatment system disclosed by the utility model reduces the operation difficulty of setting multiple heat sources, simplifies the equipment manufacturing process and greatly saves the operation and equipment cost.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the utility model and, together with the description, serve to explain the utility model and not to limit the utility model. Wherein:
FIG. 1 is a schematic flow diagram of an embodiment of a system for treating waste water by combined freeze evaporation and concentration according to the present invention;
description of reference numerals: 1-a slab ice machine; 2-an ice water tank; 3-a high pressure pump; 4-a membrane filter; 5-purifying the water tank; 6, draining the pump; 7-an ice water circulating pump; 8-a cooler; 9-a sewage outlet pipeline; 10-a sewage inlet pipeline; 11-air cooling condenser; 12-a water-cooled condenser; 13-an evaporation kettle; 14-a vacuum pump; 15-evaporation circulation pump; 16-a positive displacement pump; 17-concentrated solution; 18-a liquid return loop; 19-condensation duct.
Detailed Description
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. The various examples are provided by way of explanation of the utility model, and not limitation of the utility model. In fact, it will be apparent to those skilled in the art that modifications and variations can be made in the present invention without departing from the scope or spirit thereof. For instance, features illustrated or described as part of one embodiment, can be used with another embodiment to yield a still further embodiment. It is therefore intended that the present invention encompass such modifications and variations as fall within the scope of the appended claims and equivalents thereof.
In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are for convenience of description of the present invention only and do not require that the present invention must be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. The terms "connected," "connected," and "disposed" as used herein are intended to be broadly construed, and may include, for example, fixed and removable connections; can be directly connected or indirectly connected through intermediate components; the connection may be a wired electrical connection, a wireless electrical connection, or a wireless communication signal connection, and a person skilled in the art can understand the specific meaning of the above terms according to specific situations.
An example of the utility model is shown in the accompanying drawings. The detailed description uses numerical and letter designations to refer to features in the drawings. Like or similar designations in the drawings and description have been used to refer to like or similar parts of the utility model. As used herein, the terms "first," "second," and "third," etc. may be used interchangeably to distinguish one component from another, and are not intended to denote the position or importance of the individual components.
As shown in fig. 1, according to an embodiment of the present invention, there is provided a sewage treatment system with freezing-evaporating combined concentration, which includes a sewage freezing treatment unit and a sewage evaporating treatment unit, after sewage from a sewage inlet pipeline 10 enters an ice plate making machine 1, the sewage freezing treatment unit includes an ice plate making machine 1, an ice water tank 2, a high pressure pump 3, a membrane filter 4 and a purified water tank 5 which are connected in sequence, wherein the ice plate making machine 1 includes an expansion valve, an ice maker, a compressor, a circulation pump and a circulation tank inside; circulating liquid is extracted from the circulating tank, sprayed on the outer surface of the ice maker through a pipeline and used for circulating sewage during ice making; the circulating tank is used for storing surplus ice-making circulating liquid which is not made into ice and is sprayed by the ice maker; the circulating liquid is sequentially circulated in a circulating pump, the outer surface of the ice maker and the circulating groove in a water way.
The sewage freezing treatment unit is used for circulating sewage to make ice on the outer surface of an ice maker in the plate ice maker 1, and purifying sewage after ice making treatment of the plate ice maker 1 so as to separate and decontaminate ice making circulating liquid which is not made into ice and ice blocks which are frozen. Specifically, the plate ice maker 1 in the sewage freezing treatment unit continuously sprays circulating liquid from the surface of an ice maker of the plate ice maker 1 by using an internal circulating pump, ice is continuously made on the surface of the ice maker and then is removed, an ice layer reaches 3 cm-15 cm and automatically falls off, the removed ice is broken into broken ice on a screen plate in the ice maker and is separated from sewage, and the broken ice automatically falls into the ice water tank 2. The crushed ice is easier to melt in the ice water tank 2 than the whole ice, cold water enters the cooler 8 through the ice water circulating pump 7 to absorb heat, hot water absorbing the heat returns to the ice water tank 2, the temperature of the ice water tank 2 rises to melt the crushed ice, the crushed ice in the ice water tank 2 is pressed into the membrane filter 4 through the high-pressure pump 3 after being melted, and the high-standard purified water is further obtained through deep purification through the membrane filter 4. The purified sewage in the plate ice maker 1 after the ice making process is filtered by the membrane filter 4, so that the applicability and the efficiency of the use of the membrane filter 4 are improved, the purification efficiency of the sewage is correspondingly improved, and the maintenance period and the service life of the membrane filter 4 are greatly prolonged.
The sewage treatment system also comprises a liquid return loop 18, a small amount of residual liquid with higher concentration is left after being filtered by the membrane filter 4 and then returns to the sewage inlet pipeline 10 through the liquid return loop 18 to flow into the plate ice machine 1, the remaining small amount of residual liquid with higher concentration is mixed with sewage stock solution in the sewage inlet pipeline 10, and the mixed sewage is purified again by a sewage freezing treatment unit from the ice maker or is purified by a sewage evaporation treatment unit through ice making waste liquid. From the sewage inlet pipeline 10, the liquid return loop comprises an ice plate maker 1, an ice water tank 2, a high-pressure pump 3, a membrane filter 4, a liquid return loop 18 and a sewage inlet pipeline 10 which are sequentially connected; and returning a small amount of residual liquid which is relatively thick and is left after passing through the membrane filter 4 to the plate ice machine 1 through a liquid return circuit 18 for circularly making ice or evaporating and purifying. The ice blocks which are frozen in the ice water tank 2 are melted, and then filtered into purified water by the membrane filter 4 to be discharged into the purified water tank 5, and the purification rate of the sewage through the sewage freezing treatment unit can reach about 90 percent.
The method comprises the following steps that residual ice making circulating liquid which is not made into ice in an internal circulating groove of the plate ice machine 1 enters an evaporation system after reaching a specified concentration, wherein the evaporation system comprises an evaporation heating loop and an evaporation condensation branch unit; the evaporation heating loop starts from the evaporation kettle 13 and comprises the evaporation kettle 13, an evaporation circulating pump 15, a water-cooled condenser 12 and the evaporation kettle 13 which are connected in sequence; the circulating liquid is from an evaporation kettle 13, the supplementing liquid is from the ice making circulating liquid in a circulating tank in the plate ice maker, the evaporation heating loop is used for enabling the ice making circulating liquid which is not made into ice to sequentially enter the evaporation kettle 13, an evaporation circulating pump 15 and a water-cooled condenser 12, enabling the ice making circulating liquid to enter the water-cooled condenser 12 to be heated and separated into water vapor, finally returning to the evaporation kettle 13, and evaporating the water in the circulating liquid into the water vapor to be separated and purified after repeated circulation heating; the heat released by the condensation and liquefaction of the refrigerant in the water-cooled condenser 12 is absorbed, and the temperature of the heated circulating liquid is about 35 ℃.
The waste liquid concentrated from the evaporation kettle 13 is discharged into a concentrated liquid discharging branch, and the concentrated liquid discharging branch comprises an evaporation kettle 13, a liquid discharging pump 16 and a concentrated liquid pool 17 which are sequentially connected; and the lower layer concentrated solution in the evaporation kettle 13 is discharged into a concentrated solution pool 17 through a concentrated solution discharge branch, wherein the concentrated solution discharge branch is used for discharging the highly concentrated solution reaching the specified concentration through the evaporation heating loop into the concentrated solution pool 17 through a liquid discharge pump 16, and the highly concentrated solution reaching the specified concentration in the circulating solution is discharged out of the evaporation system through the liquid discharge pump 16. For example, a refuse leachate having a chloride ion concentration of 137mg/L as a raw solution and a circulating solution of 650mg/L as a specified concentration after concentration is discharged to the concentrate tank 17.
The evaporation kettle in the evaporation system is also connected with a vacuum pump 14, the vacuum pump 14 is coupled with the evaporation kettle 13, and the vacuum pump 14 is used for exhausting gas from the evaporation system to the atmosphere environment to maintain the vacuum degree of the evaporation system. The evaporation system also comprises a pressure meter for monitoring the air pressure in the evaporation kettle 13 and a thermometer for monitoring the temperature in the evaporation kettle, and the pressure meter and the thermometer are respectively fixedly connected with the evaporation kettle.
The water vapor discharged from the condensation pipeline 19 of the evaporation kettle 13 is condensed into water through an evaporation and condensation branch unit, and the evaporation and condensation branch unit comprises a cooler 8, a drainage pump 6 and a purified water tank 5 which are sequentially connected; the evaporation condensation branch unit is used for collecting water vapor in the evaporation kettle 13, flows into the cooler 8 and condenses into purified water through condensation, and the purified water is discharged into the purification water tank 5 through the drainage pump 6, so that the evaporation purification effect is achieved, the water vapor in the evaporation kettle 13 flows into the cooler 8 to release heat and supply ice water in the condensation branch of the evaporation system, the condensation temperature is about 5 ℃, meanwhile, the water vapor condenses into purified water, and the purified water is discharged out of the system through the drainage pump 6.
The sewage treatment system also comprises a refrigerant loop unit, wherein the refrigerant loop unit comprises a refrigerant which is connected with the plate ice machine 1, a water-cooled condenser 12 and an air-cooled condenser 11 sequentially through pipelines and then returns to the plate ice machine 1, and the refrigerant sequentially passes through an expansion valve, an ice maker and a compressor in the plate ice machine 1; the expansion valve throttles the high-temperature high-pressure liquid refrigerant in the air-cooled condenser 11 into a low-temperature low-pressure liquid refrigerant, and the low-temperature low-pressure liquid refrigerant enters a refrigerant channel inside the ice maker; the internal refrigerant channel of the ice maker evaporates the low-temperature low-pressure liquid refrigerant flowing out of the expansion valve into a low-temperature low-pressure gaseous refrigerant, and the compressor compresses the low-temperature low-pressure gaseous refrigerant flowing out of the ice maker into a high-temperature high-pressure gaseous refrigerant.
The expansion valve of the plate ice machine 1, the refrigerant channel inside the ice machine and the compressor are sequentially connected, the refrigerant circulates in the refrigerant loop unit, the refrigerant loop unit is mainly used for recycling cold and heat sources of the refrigerant, the liquid refrigerant is converted into low-temperature liquid refrigerant in the ice machine, the low-temperature liquid refrigerant is pressurized into high-temperature gaseous refrigerant through the compressor, a part of the high-temperature gaseous refrigerant is converted into the liquid refrigerant in the water-cooled condenser 12, the rest of the high-temperature gaseous refrigerant is converted into the high-temperature high-pressure liquid refrigerant in the air-cooled condenser 11, the high-temperature high-pressure liquid refrigerant flows into the expansion valve of the plate ice machine 1 to be throttled into low-pressure low-temperature liquid refrigerant, and the high-temperature high-pressure liquid refrigerant returns into the ice machine for recycling. The refrigerant circulates in a loop connected with the compressor, the water-cooled condenser 12, the air-cooled condenser 11, the expansion valve, the ice maker and the compressor, the water-cooled condenser 12 transmits the heat of condensation of a part of high-temperature gaseous refrigerant to circulating sewage in the evaporation heating loop, the air-cooled condenser discharges the redundant heat of the water-cooled condenser 12 to the ambient air, the redundant condensation heat of the ice maker is discharged, and the heat balance of the system is maintained. The water cooled condenser 12 releases heat to the circulating wastewater in the evaporative heating circuit of the evaporative system. The sewage treatment system also comprises an evaporative cooling loop, and the evaporative cooling loop comprises a cooler 8, an ice water tank 2, an ice water circulating pump 7 and a cooler 8 which are sequentially connected. The evaporative cooling loop is used for absorbing heat of steam in the condensation branch in the cooler by circulating sewage, and the heat is released when the circulating sewage melts ice in the ice water tank. Circulating sewage in the pipeline of the evaporative cooling loop circulates in the ice water tank 2, the ice water circulating pump 7, the cooler 8 and the ice water tank 2 in sequence, the circulating sewage absorbs heat of water vapor in the evaporative condensation branch unit in the cooler 8, the circulating sewage after absorbing the heat enters the ice water tank 2 to melt broken ice in the ice water tank 2, and the ice water circulating pump 7 is used for circulating sewage in the pipeline of the evaporative cooling loop.
From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects:
1. compared with an electric boiler evaporation concentration device, an MVR vapor compression evaporation concentration device or a heat pump low-temperature vacuum evaporation concentration device, the total cost of the technical scheme disclosed by the utility model can be greatly reduced by about 40-90%, and the energy consumption can be reduced by about 60-95%.
2. Compared with the water evaporation energy consumption per ton of about 250kwh of a conventional heat pump evaporation, dehumidification and concentration device and the high-efficiency and energy-saving sewage freezing and concentration technology, the technical scheme disclosed by the utility model achieves the water evaporation energy consumption per ton of about 50kwh, can greatly reduce the energy consumption by about 80%, and is more energy-saving and cost-saving.
3. Compared with the ton water evaporation energy consumption of about 100kwh of a static freezing concentration technology, the high-efficiency and energy-saving sewage freezing concentration technology can reach the ton water evaporation energy consumption of about 50kwh, the energy consumption can be greatly reduced by about 50%, the energy is saved, the cost is saved, and the purification rate is high.
4. 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 50kwh, the energy consumption can be greatly reduced by over 50 percent, the energy is saved, the cost is saved, the purification effect is good, the energy consumption is low, and the investment cost is low.
5. Compared with about 65kwh ton water evaporation energy consumption of a plate ice freezing concentration technology, the high-efficiency energy-saving sewage freezing concentration technology can reach about 50kwh ton water evaporation energy consumption, and the energy consumption can be greatly reduced by more than 20%.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A sewage treatment system combining freezing evaporation and concentration is characterized in that,
the sewage treatment system comprises a sewage freezing treatment unit, a sewage evaporation treatment unit and a refrigerant loop unit, wherein the refrigerant loop unit comprises an ice plate maker, a water-cooled condenser, an air-cooled condenser and an ice plate maker which are sequentially connected through pipelines; the refrigerant is used in the internal circulation of refrigerant return circuit unit, and the refrigerant passageway that the refrigerant formed includes in proper order in the board ice machine the part that passes through includes:
the expansion valve is used for throttling the high-temperature high-pressure liquid refrigerant from the air-cooled condenser into a low-temperature low-pressure liquid refrigerant;
the ice maker comprises an ice maker, an internal refrigerant channel of which evaporates low-temperature and low-pressure liquid refrigerants flowing out of an expansion valve into low-temperature and low-pressure gaseous refrigerants; a compressor compressing a low-temperature and low-pressure gaseous refrigerant flowing out of the ice maker into a high-temperature and high-pressure gaseous refrigerant;
the high-temperature high-pressure gaseous refrigerant sequentially enters the water-cooling condenser and the air-cooling condenser to be liquefied and converted into a low-temperature low-pressure liquid refrigerant, the low-temperature low-pressure liquid refrigerant returns to the ice maker through the expansion valve again to be circulated, and the refrigerant loop unit is used for recycling cold and heat sources of the refrigerant.
2. The sewage treatment system of freezing-evaporation combined concentration according to claim 1,
the sewage freezing treatment unit comprises an ice plate machine, an ice water tank, a high-pressure pump, a membrane filter and a purification water tank which are sequentially connected;
the interior of the plate ice machine also comprises:
the circulating tank is used for storing ice-making circulating liquid;
the circulating pump is used for extracting ice-making circulating liquid from the circulating tank and spraying the ice-making circulating liquid on the outer surface of the ice maker through a pipeline, and the circulating pump is used for circulating sewage during ice making;
spraying water from the outer surface of the ice maker to make ice, and purifying the ice; the sewage freezing treatment unit is used for circulating sewage to make ice in the ice maker, separating ice making circulating liquid which is not made into ice from ice blocks which are formed into ice to remove dirt, melting the ice blocks which are formed into ice in the ice water tank, pressurizing the ice blocks by a high-pressure pump, enabling the ice blocks to enter a membrane filter to be filtered into purified water, and discharging the purified water into a purified water tank.
3. The sewage treatment system of freezing-evaporating combined concentration according to claim 2,
the sewage evaporation treatment unit comprises an evaporation heating loop, and the evaporation heating loop comprises a water-cooled condenser, an evaporation kettle, an evaporation circulating pump and a water-cooled condenser which are sequentially connected; the evaporation heating loop is used for evaporation separation and purification after ice-making waste liquid which is not made into ice enters the water-cooled condenser, the evaporation kettle, the evaporation circulating pump and the water-cooled condenser for repeated circulation heating.
4. The sewage treatment system of freezing-evaporation combined concentration according to claim 3,
the evaporation kettle of the sewage evaporation treatment unit is also connected with a concentrated solution discharge branch, and the concentrated solution discharge branch comprises an evaporation kettle, a liquid discharge pump and a concentrated solution pool; and the concentrated solution discharge branch is used for discharging the highly concentrated solution which reaches the specified concentration through the evaporation heating loop into the concentrated solution pool through a liquid discharge pump.
5. The sewage treatment system of freezing-evaporation combined concentration according to claim 3,
the sewage evaporation treatment unit also comprises an evaporation and condensation branch, and the evaporation and condensation branch comprises a cooler, a drainage pump and a purified water tank which are sequentially connected; the evaporation and condensation branch unit is used for collecting steam in the evaporation kettle, condensing the steam into purified water after the steam enters the cooler, and discharging the purified water into the purified water tank through the drainage pump.
6. The sewage treatment system of freezing-evaporation combined concentration according to claim 3,
the sewage evaporation treatment unit also comprises an evaporation cooling loop, and the evaporation cooling loop comprises a cooler, an ice water tank, an ice water circulating pump and a cooler which are sequentially connected; the evaporative cooling loop is used for absorbing heat of steam in the condensation branch in the cooler by circulating sewage and releasing heat when water in the ice water tank is condensed into ice.
7. The sewage treatment system of freezing-evaporating combined concentration according to claim 2,
the sewage treatment system also comprises a liquid return loop, wherein the liquid return loop comprises an ice plate maker, an ice water tank, a high-pressure pump, a membrane filter and a sewage main pipeline which are sequentially connected; and a small amount of concentrated residual liquid is left after the circulating sewage or the sewage stock solution is filtered by a membrane filter of the sewage freezing treatment unit, returns to the plate ice maker through a liquid return loop, and is circulated from the plate ice maker again to enter the sewage freezing treatment unit or the sewage evaporation treatment unit.
8. The sewage treatment system of freezing-evaporation combined concentration according to claim 3,
the sewage evaporation treatment unit further comprises a vacuum pump, the vacuum pump is coupled with the evaporation kettle, and the vacuum pump is used for exhausting gas from the evaporation system to the atmosphere environment to maintain the vacuum degree of the evaporation system.
9. The sewage treatment system of freezing-evaporation combined concentration according to claim 3,
the sewage evaporation treatment unit further comprises a pressure gauge, the pressure gauge is fixedly connected with the evaporation kettle, and the pressure gauge is used for monitoring the air pressure in the evaporation kettle.
10. The sewage treatment system of freezing-evaporation combined concentration according to claim 3,
the sewage evaporation treatment unit further comprises a thermometer, the thermometer is fixedly connected with the evaporation kettle, and the thermometer is used for monitoring the temperature in the evaporation kettle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202220343202.6U CN216808479U (en) | 2022-02-18 | 2022-02-18 | Sewage treatment system with freezing evaporation combined concentration |
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| CN202220343202.6U CN216808479U (en) | 2022-02-18 | 2022-02-18 | Sewage treatment system with freezing evaporation combined concentration |
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| CN216808479U true CN216808479U (en) | 2022-06-24 |
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