CN111197873A - Wide-temperature-range overlapping precise temperature control heat exchange system and control method thereof - Google Patents
Wide-temperature-range overlapping precise temperature control heat exchange system and control method thereof Download PDFInfo
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- CN111197873A CN111197873A CN202010036737.4A CN202010036737A CN111197873A CN 111197873 A CN111197873 A CN 111197873A CN 202010036737 A CN202010036737 A CN 202010036737A CN 111197873 A CN111197873 A CN 111197873A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B7/00—Compression machines, plants or systems, with cascade operation, i.e. with two or more circuits, the heat from the condenser of one circuit being absorbed by the evaporator of the next circuit
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/022—Compressor control arrangements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Abstract
The invention discloses a wide temperature range overlapping precise temperature control heat exchange system and a control method thereof, wherein the system comprises a low-temperature-level refrigeration system, a high-temperature-level refrigeration system, a plant water system, a circulating flow system and an evaporative condenser, and the high-temperature-level refrigeration system comprises a high-temperature-level compressor, a condenser, a first electronic expansion valve, a third electronic expansion valve and a first gas-liquid separator; the low-temperature-stage refrigeration system comprises a low-temperature-stage compressor, a precooler, an oil separator, a second electronic expansion valve and a second gas-liquid separator; one path of the plant water system is connected with a plant water inlet and a plant water outlet of the condenser, and the other path of the plant water system is connected with a plant water interface of the precooler; the circulating fluid system includes a first evaporator, a second evaporator, a water pump, and a temperature sensor. The invention provides a wide-temperature-range ultralow-temperature circulating medium, realizes precise temperature control of high-temperature working conditions, medium-temperature working conditions and low-temperature working conditions in a wide temperature range by a control method, enlarges the temperature range of the circulating medium, and ensures the precise temperature control requirement of the ultralow-temperature wide temperature range.
Description
Technical Field
The invention relates to a precise temperature control heat exchange system, in particular to a wide-temperature-range overlapping precise temperature control heat exchange system and a control method thereof.
Background
In some production equipment and process requirements, the requirement of wide-temperature-range precise temperature control exists, the temperature control is taken as a key factor, and the quality of a product can be seriously influenced by small change of the temperature. However, the conventional precise temperature control heat exchange system usually uses a refrigeration loop consisting of a single refrigeration system to realize refrigeration, the minimum refrigeration temperature reaches-40 ℃, and the refrigeration system can not reach lower temperature although meeting the requirement of precise temperature control.
The existing cascade refrigeration system realizes cascade refrigeration by a high-temperature and low-temperature two-stage loop and an intermediate heat exchanger, and although the temperature of the existing cascade refrigeration system can reach a temperature lower than that of the traditional refrigeration system, the existing cascade refrigeration system is designed according to a low-temperature working condition basically and cannot meet the use requirement of wide-temperature-range precise temperature control.
In addition, the high-temperature stage evaporator is added, so that the high-temperature stage independent operation can be realized, and the high-temperature circulating fluid is prepared. However, when the medium temperature fluid is required, if the cascade mode is operated, the low-temperature stage compressor has large return gas superheat degree, high return gas temperature and other adverse effects, or the high-temperature stage system is operated alone, the low pressure and the insufficient refrigerating capacity are caused.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects in the prior art, the wide-temperature-range overlapping precise temperature control heat exchange system and the control method thereof are provided, and the precise temperature control of low temperature and wide temperature range can be realized.
The technical scheme is as follows: in order to achieve the above object, the present invention provides a wide temperature range overlapping precise temperature control heat exchange system, which comprises a low temperature stage refrigeration system, a high temperature stage refrigeration system, a plant water system, a circulating flow system and an evaporative condenser, wherein the high temperature stage refrigeration system comprises a high temperature stage compressor, a condenser, a first electronic expansion valve, a third electronic expansion valve and a first gas-liquid separator; the low-temperature stage refrigeration system comprises a low-temperature stage compressor, a precooler, an oil separator, a second electronic expansion valve and a second gas-liquid separator; the plant service water system comprises two parts, one part is connected with a plant service water inlet and outlet of the condenser, and the other part is connected with a plant service water interface of the precooler; the circulating fluid system comprises a first evaporator, a second evaporator, a water pump and a temperature sensor;
the low-temperature-stage refrigeration system and the high-temperature-stage refrigeration system form a cascade system through an evaporative condenser, a high-temperature-stage compressor is connected with a refrigerant inlet of the condenser, a refrigerant outlet of the condenser is respectively connected with a high-temperature refrigerant inlet of the evaporative condenser and a refrigerant inlet of a second evaporator through a first electronic expansion valve and a third electronic expansion valve, a high-temperature refrigerant outlet of the evaporative condenser and a refrigerant outlet of the second evaporator are connected with a first gas-liquid separator in parallel, and the first gas-liquid separator is connected with the high-temperature-stage compressor; the low-temperature stage compressor is respectively connected with a refrigerant inlet of the precooler and an oil separator, the oil separator is respectively connected with a refrigerant outlet of the precooler and a low-temperature refrigerant inlet of the evaporative condenser, a low-temperature refrigerant outlet of the evaporative condenser is connected with a refrigerant inlet of the first evaporator through the second electronic expansion valve, and a refrigerant outlet of the first evaporator is connected with the low-temperature stage compressor through the second gas-liquid separator;
the water inlet sides of the first evaporator and the second evaporator are connected in parallel and are respectively provided with a first low-temperature electromagnetic valve and a second low-temperature electromagnetic valve, and the water outlet sides of the first evaporator and the second evaporator are connected in parallel with a water pump and a temperature sensor.
Furthermore, a water tank and an electric heater are arranged between the water outlet sides of the first evaporator and the second evaporator and the water pump and are used for carrying out auxiliary control on the temperature of the circulating fluid.
Furthermore, a first dry filter is arranged on the refrigerant outlet side of the condenser, and a liquid reservoir and a second dry filter are sequentially arranged on the liquid outlet side of the evaporative condenser.
Furthermore, the low-temperature stage compressor is also connected with a low-temperature stage expansion tank in parallel, and the low-temperature stage expansion tank is provided with an electromagnetic valve.
Furthermore, a water quantity regulating valve is arranged on the plant service water inlet side of the precooler and used for regulating the flow of the plant service water.
Further, an evaporation pressure regulating valve is arranged on the refrigerant outlet side of the evaporation condenser and used for regulating evaporation pressure.
Further, a first check valve is arranged on the refrigerant outlet side of the second evaporator, and a second check valve is arranged on the water outlet side of the first evaporator.
A control method of a wide temperature range overlapping precise temperature control heat exchange system comprises three control processes of high-temperature refrigeration working condition circulation, medium-temperature refrigeration working condition circulation and low-temperature refrigeration working condition circulation, wherein the specific processes are respectively as follows:
high-temperature refrigeration working condition circulation: opening the first low-temperature electromagnetic valve, closing the second low-temperature electromagnetic valve, discharging high-temperature and high-pressure refrigerant from the high-temperature stage compressor, allowing the refrigerant to enter a condenser, exchanging heat with plant water in the condenser, condensing the refrigerant into high-pressure liquid, throttling and depressurizing the liquid from the condenser through a third electronic expansion valve, allowing the liquid to enter a second evaporator, allowing the refrigerant to exchange heat with circulating fluid in the second evaporator for evaporation, returning the evaporated gaseous refrigerant to the high-temperature stage compressor, completing circulation, and allowing the prepared circulating fluid to be high-temperature fluid;
medium temperature refrigeration working condition circulation: opening a first low-temperature electromagnetic valve, opening a second low-temperature electromagnetic valve, discharging a high-temperature and high-pressure refrigerant from a high-temperature stage compressor, entering a condenser, exchanging heat with plant water in the condenser, condensing the refrigerant into high-pressure liquid, respectively entering the first electronic expansion valve and a third electronic expansion valve from the liquid discharged from the condenser, entering an evaporation condenser from the refrigerant subjected to throttling and pressure reduction by the first electronic expansion valve, exchanging heat with a low-temperature stage refrigeration system in the evaporation condenser and evaporating the refrigerant, entering a second evaporator from the refrigerant subjected to throttling and pressure reduction by the third electronic expansion valve, exchanging heat with a circulating fluid in the second evaporator and evaporating the refrigerant, mixing the gaseous refrigerant evaporated by the evaporation condenser and the second evaporator and returning to the high-temperature stage compressor to complete high-temperature stage circulation, wherein the circulating fluid obtained by heat exchange of the second evaporator is a high-temperature fluid; the low-temperature-stage compressor discharges high-temperature and high-pressure refrigerant, the refrigerant enters the evaporative condenser, the refrigerant exchanges heat with the high-temperature-stage system in the evaporative condenser and is condensed into high-pressure liquid, the liquid discharged from the evaporative condenser is throttled and depressurized by the second electronic expansion valve and then enters the first evaporator, the refrigerant exchanges heat with circulating fluid in the first evaporator and is evaporated, the evaporated gaseous refrigerant returns to the low-temperature-stage compressor to complete low-temperature-stage circulation, and the circulating fluid prepared by the first evaporator through heat exchange is low-temperature fluid; finally, the high-temperature circulating fluid prepared by the heat exchange of the second evaporator and the low-temperature circulating fluid prepared by the heat exchange of the first evaporator are mixed to prepare medium-temperature fluid;
low-temperature refrigeration working condition circulation: closing the first low-temperature electromagnetic valve, opening the second low-temperature electromagnetic valve, discharging high-temperature and high-pressure refrigerant from the high-temperature stage compressor, allowing the refrigerant to enter a condenser, exchanging heat with plant water in the condenser, condensing the refrigerant into high-pressure liquid, throttling and depressurizing the liquid from the condenser through a first electronic expansion valve, allowing the liquid to enter an evaporative condenser, allowing the refrigerant to exchange heat with a low-temperature stage system in the evaporative condenser and evaporate, returning the evaporated gaseous refrigerant to the high-temperature stage compressor, and completing high-temperature stage circulation; the low-temperature stage compressor discharges high-temperature and high-pressure refrigerant, the refrigerant enters the evaporative condenser, the refrigerant exchanges heat with the high-temperature stage system in the evaporative condenser and is condensed into high-pressure liquid, the liquid discharged from the evaporative condenser enters the first evaporator after being throttled and depressurized by the second electronic expansion valve, the refrigerant exchanges heat with circulating fluid in the first evaporator and is evaporated, the evaporated gaseous refrigerant returns to the low-temperature stage compressor, low-temperature stage circulation is completed, and the prepared circulating fluid is low-temperature fluid.
Furthermore, the first electronic expansion valve, the second electronic expansion valve and the third electronic expansion valve respectively comprise mutually independent electronic expansion valve units, the electronic expansion valve devices are controlled by the temperature of the circulating fluid detected by the temperature sensor, and the switching proportion of the electronic expansion valves is controllable; in the processes of high-temperature refrigeration working condition circulation, medium-temperature refrigeration working condition circulation and low-temperature refrigeration working condition circulation, the temperature of the circulating fluid is detected through the temperature sensor, and the switching proportions of the first electronic expansion valve, the second electronic expansion valve and the third electronic expansion valve are correspondingly adjusted according to the detected temperature of the circulating fluid.
Has the advantages that: compared with the prior art, the invention has the following advantages:
1. the heat exchange system comprises two independent systems of a high-temperature stage and a low-temperature stage, and the two independent systems are integrated through a cascade technology. When a low-temperature working condition is required, the high-temperature system and the low-temperature system operate simultaneously; when the medium temperature working condition is required, the high-temperature-level system and the low-temperature-level system respectively prepare high-temperature fluid and low-temperature fluid, and the high-temperature-level system and the low-temperature-level system are mixed to prepare medium-temperature fluid; and when high-temperature working conditions are required, the high-temperature-level system is operated independently. The system can prepare circulating fluid under different working conditions, and meets the requirement of wide temperature range.
2. According to the invention, the accurate control of the temperature of the circulating fluid is realized by adjusting the switching ratio of each electronic expansion valve, and the use effect of the circulating fluid is ensured.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
Wherein: 1-a high temperature stage compressor; 2-a condenser; 3-a first dry filter; 4-a first electronic expansion valve; 5-an evaporative condenser; 6-a first gas-liquid separator; 7-a third electronic expansion valve; 8-a second evaporator; 9-a low temperature stage compressor; 10-a precooler; 11-an oil separator; 12-a reservoir; 13-a second dry filter; 14-a second electronic expansion valve; 15-a second evaporator; 16-a second gas-liquid separator; 17-a solenoid valve; 18-a low temperature stage expansion tank; 19-water quantity regulating valve; 20-a first low temperature solenoid valve; 21-a second low temperature solenoid valve; 22-a water tank; 23-an electric heater; 24-a water pump; 25-a temperature sensor; 26-evaporation pressure regulating valve; 27-a first check valve; 28-second check valve.
Detailed Description
The invention is further elucidated with reference to the drawings and the embodiments.
As shown in fig. 1, the present invention provides a wide temperature range overlapping precise temperature control heat exchange system, which comprises a low temperature stage refrigeration system, a high temperature stage refrigeration system, a plant water system, a circulating flow system and an evaporative condenser 5, wherein the high temperature stage refrigeration system comprises a high temperature stage compressor 1, a condenser 2, a first electronic expansion valve 4, a third electronic expansion valve 7 and a first gas-liquid separator 6; the low-temperature stage refrigeration system comprises a low-temperature stage compressor 9, a precooler 10, an oil separator 11, a second electronic expansion valve 14 and a second gas-liquid separator 16; the plant service water system comprises two parts, one part is connected with a plant service water inlet and outlet of the condenser 2, and the other part is connected with a plant service water interface of the precooler 10; the circulating fluid system includes a first evaporator 15, a second evaporator 8, a water tank 22, an electric heater 23, a water pump 24, and a temperature sensor 25.
The low-temperature-stage refrigeration system and the high-temperature-stage refrigeration system form a cascade system through an evaporative condenser, a high-temperature-stage compressor 1 is connected with a refrigerant inlet of a condenser 2, a refrigerant outlet of the condenser 2 is respectively connected with a high-temperature refrigerant inlet of the evaporative condenser 5 and a refrigerant inlet of a second evaporator 8 through a first electronic expansion valve 4 and a third electronic expansion valve 7, a high-temperature refrigerant outlet of the evaporative condenser 5 and a refrigerant outlet of the second evaporator 8 are connected with a first gas-liquid separator 6 in parallel, and the first gas-liquid separator 6 is connected with the high-temperature-stage compressor 1; the low-temperature stage compressor 9 is respectively connected with a refrigerant inlet of the precooler 10 and an oil separator 11, the oil separator 11 is respectively connected with a refrigerant outlet of the precooler 10 and a low-temperature refrigerant inlet of the evaporative condenser 5, a low-temperature refrigerant outlet of the evaporative condenser 5 is connected with a refrigerant inlet of the first evaporator 15 through the second electronic expansion valve 14, and a refrigerant outlet of the first evaporator 15 is connected with the low-temperature stage compressor 9 through the second gas-liquid separator 16.
The water inlet sides of the first evaporator 15 and the second evaporator 8 are connected in parallel and are respectively provided with a first low-temperature electromagnetic valve 20 and a second low-temperature electromagnetic valve 21, and the water outlet sides of the first evaporator 15 and the second evaporator 8 are connected in parallel with a water pump 24 and a temperature sensor 25.
The water tank 22 and the electric heater 23 are arranged between the water outlet sides of the first evaporator 15 and the second evaporator 8 and the water pump 24 in the embodiment; a first dry filter 3 is arranged on the refrigerant outlet side of the condenser 2, and a liquid reservoir 12 and a second dry filter 13 are sequentially arranged on the liquid outlet side of the evaporative condenser 5; the low-temperature stage compressor is also connected with a low-temperature stage expansion tank 18 in parallel, and the low-temperature stage expansion tank 18 is provided with an electromagnetic valve 17; a water quantity regulating valve 19 is arranged on the plant service water inlet side of the precooler 10; an evaporation pressure regulating valve 26 is arranged on the refrigerant outlet side of the evaporation condenser 5; the refrigerant outlet side of the second evaporator 8 is provided with a first check valve 27, and the water outlet side of the first evaporator is provided with a second check valve 28.
In this embodiment, the exchange system is applied to temperature control of the circulating fluid, and is divided into three control modes, namely a high-temperature refrigeration working condition cycle, a medium-temperature refrigeration working condition cycle and a low-temperature refrigeration working condition cycle, and the operation processes are respectively as follows:
high-temperature refrigeration working condition circulation: the first low-temperature electromagnetic valve 20 is opened, the second low-temperature electromagnetic valve 21 is closed, high-temperature and high-pressure refrigerant is discharged from the high-temperature stage compressor 1 and enters the condenser 2, the refrigerant exchanges heat with plant service water in the condenser 2, the refrigerant is condensed into high-pressure liquid, the liquid discharged from the condenser 2 is processed by the first drying filter 3, enters the third electronic expansion valve 7 for throttling and pressure reduction, enters the second evaporator 8, the refrigerant exchanges heat with circulating fluid in the second evaporator 8 for evaporation, the evaporated gaseous refrigerant is processed by the first gas-liquid separator 6 and then returns to the high-temperature stage compressor 1, circulation is completed, and the prepared circulating fluid is high-temperature fluid.
Medium temperature refrigeration working condition circulation: the first low-temperature electromagnetic valve 20 is opened, the second low-temperature electromagnetic valve 21 is opened, the high-temperature stage compressor 1 discharges high-temperature and high-pressure refrigerant, the refrigerant enters the condenser 2, the refrigerant exchanges heat with plant service water in the condenser 2 to condense the refrigerant into high-pressure liquid, the liquid discharged from the condenser 2 is processed by the first drying filter 3, the liquid respectively enters the first electronic expansion valve 4 and the third electronic expansion valve 7, the refrigerant after throttling and pressure reduction by the first electronic expansion valve 4 enters the evaporation condenser 5, the refrigerant exchanges heat with a low-temperature stage refrigeration system in the evaporation condenser and evaporates, the refrigerant after throttling and pressure reduction by the third electronic expansion valve 7 enters the second evaporator 8, the refrigerant exchanges heat with circulating fluid in the second evaporator 8 and evaporates, and the gaseous refrigerant after evaporation by the evaporation condenser 5 and the second evaporator 8 is mixed and processed by the first gas-liquid separator 6 and then returns to the high-temperature stage compressor 1, completing high-temperature stage circulation, wherein at the moment, the circulating fluid prepared by the heat exchange of the second evaporator 8 is high-temperature fluid; meanwhile, a high-temperature and high-pressure refrigerant is discharged by the low-temperature stage compressor 9 and enters the evaporative condenser 5, the refrigerant exchanges heat with a high-temperature stage system in the evaporative condenser 5 and is condensed into high-pressure liquid, the liquid discharged by the evaporative condenser 5 is stored in the liquid storage device 12, is processed by the second drying filter 13, is throttled and depressurized by the second electronic expansion valve 14 and enters the first evaporator 15, the refrigerant exchanges heat with circulating fluid in the first evaporator 15 and is evaporated, the evaporated gaseous refrigerant returns to the low-temperature stage compressor 9 after being processed by the second gas-liquid separator 16, low-temperature stage circulation is completed, and at the moment, the circulating fluid prepared by heat exchange of the first evaporator 15 is low-temperature fluid; finally, the high-temperature circulating fluid obtained by heat exchange in the second evaporator 8 and the low-temperature circulating fluid obtained by heat exchange in the first evaporator 15 are mixed to obtain the medium-temperature fluid.
Low-temperature refrigeration working condition circulation: the first low-temperature electromagnetic valve 20 is closed, the second low-temperature electromagnetic valve 21 is opened, the high-temperature stage compressor 1 discharges high-temperature and high-pressure refrigerant, the refrigerant enters the condenser 2, exchanges heat with plant service water in the condenser 2, the refrigerant is condensed into high-pressure liquid, the liquid discharged from the condenser 2 is subjected to throttling and pressure reduction by the first electronic expansion valve 4 and then enters the evaporation condenser 5, the refrigerant exchanges heat with the low-temperature stage system in the evaporation condenser 5 to be evaporated, and the evaporated gaseous refrigerant returns to the high-temperature stage compressor 1 to complete high-temperature stage circulation; the low-temperature stage compressor 9 discharges high-temperature and high-pressure refrigerant, the refrigerant enters the evaporative condenser 5, the refrigerant exchanges heat with a high-temperature stage system in the evaporative condenser 5 and is condensed into high-pressure liquid, the liquid discharged from the evaporative condenser 5 is stored in the liquid storage device 12, is processed by the second drying filter 13, is throttled and depressurized by the second electronic expansion valve 14 and then enters the first evaporator 15, the refrigerant exchanges heat with circulating fluid in the first evaporator 15 and is evaporated, the evaporated gaseous refrigerant is processed by the second gas-liquid separator 16 and then returns to the low-temperature stage compressor 9, low-temperature stage circulation is completed, and the prepared circulating fluid is low-temperature fluid.
When the system operates, the temperature sensor 25 detects the real-time outflow temperature of the circulating fluid, the switching proportions of the first electronic expansion valve, the second electronic expansion valve and the third electronic expansion valve are correspondingly adjusted according to the detected real-time temperature and the actually required temperature, the effect of adjusting the temperature of the circulating fluid is achieved, and in addition, the electric heater 23 is matched to control the temperature of the circulating fluid, so that the temperature of the final circulating fluid can be precisely controlled.
Claims (9)
1. A wide temperature range overlapping precision temperature control heat exchange system is characterized in that: the system comprises a low-temperature-level refrigeration system, a high-temperature-level refrigeration system, a plant water system, a circulating flow system and an evaporative condenser, wherein the high-temperature-level refrigeration system comprises a high-temperature-level compressor, a condenser, a first electronic expansion valve, a third electronic expansion valve and a first gas-liquid separator; the low-temperature stage refrigeration system comprises a low-temperature stage compressor, a precooler, an oil separator, a second electronic expansion valve and a second gas-liquid separator; the plant service water system comprises two parts, one part is connected with a plant service water inlet and outlet of the condenser, and the other part is connected with a plant service water interface of the precooler; the circulating fluid system comprises a first evaporator, a second evaporator, a water pump and a temperature sensor;
the low-temperature-stage refrigeration system and the high-temperature-stage refrigeration system form a cascade system through an evaporative condenser, a high-temperature-stage compressor is connected with a refrigerant inlet of the condenser, a refrigerant outlet of the condenser is respectively connected with a refrigerant inlet of the evaporative condenser and a refrigerant inlet of a second evaporator through a first electronic expansion valve and a third electronic expansion valve, a refrigerant outlet of the evaporative condenser and a refrigerant outlet of the second evaporator are connected with a first gas-liquid separator in parallel, and the first gas-liquid separator is connected with the high-temperature-stage compressor; the low-temperature stage compressor is respectively connected with a refrigerant inlet of the precooler and an oil separator, the oil separator is respectively connected with a refrigerant outlet of the precooler and a liquid inlet of the evaporative condenser, a liquid outlet of the evaporative condenser is connected with a refrigerant inlet of the first evaporator through a second electronic expansion valve, and a refrigerant outlet of the first evaporator is connected with the low-temperature stage compressor through a second gas-liquid separator;
the water inlet sides of the first evaporator and the second evaporator are connected in parallel and are respectively provided with a first low-temperature electromagnetic valve and a second low-temperature electromagnetic valve, and the water outlet sides of the first evaporator and the second evaporator are connected in parallel with a water pump and a temperature sensor.
2. The wide temperature range overlapping precise temperature control heat exchange system according to claim 1, characterized in that: and a water tank and an electric heater are arranged between the water outlet sides of the first evaporator and the second evaporator and the water pump.
3. The wide temperature range overlapping precise temperature control heat exchange system according to claim 1, characterized in that: and a first dry filter is arranged on the refrigerant outlet side of the condenser, and a liquid storage device and a second dry filter are sequentially arranged on the liquid outlet side of the evaporative condenser.
4. The wide temperature range overlapping precise temperature control heat exchange system according to claim 1, characterized in that: the low-temperature stage compressor is also connected with a low-temperature stage expansion tank in parallel, and the low-temperature stage expansion tank is provided with an electromagnetic valve.
5. The wide temperature range overlapping precise temperature control heat exchange system according to claim 1, characterized in that: and a water quantity regulating valve is arranged at the service water inlet side of the precooler.
6. The wide temperature range overlapping precise temperature control heat exchange system according to claim 1, characterized in that: and an evaporation pressure regulating valve is arranged on the refrigerant outlet side of the evaporation condenser.
7. The wide temperature range overlapping precise temperature control heat exchange system according to claim 1, characterized in that: and a first check valve is arranged on the refrigerant outlet side of the second evaporator, and a second check valve is arranged on the water outlet side of the first evaporator.
8. The control method of the wide temperature range overlapping precise temperature control heat exchange system according to claim 1, characterized in that: the method comprises three control processes of high-temperature refrigeration working condition circulation, medium-temperature refrigeration working condition circulation and low-temperature refrigeration working condition circulation, wherein the specific processes are respectively as follows:
high-temperature refrigeration working condition circulation: opening the first low-temperature electromagnetic valve, closing the second low-temperature electromagnetic valve, discharging high-temperature and high-pressure refrigerant from the high-temperature stage compressor, allowing the refrigerant to enter a condenser, exchanging heat with plant water in the condenser, condensing the refrigerant into high-pressure liquid, throttling and depressurizing the liquid from the condenser through a third electronic expansion valve, allowing the liquid to enter a second evaporator, allowing the refrigerant to exchange heat with circulating fluid in the second evaporator for evaporation, returning the evaporated gaseous refrigerant to the high-temperature stage compressor, completing circulation, and allowing the prepared circulating fluid to be high-temperature fluid;
medium temperature refrigeration working condition circulation: opening a first low-temperature electromagnetic valve, opening a second low-temperature electromagnetic valve, discharging a high-temperature and high-pressure refrigerant from a high-temperature stage compressor, entering a condenser, exchanging heat with plant water in the condenser, condensing the refrigerant into high-pressure liquid, respectively entering the first electronic expansion valve and a third electronic expansion valve from the liquid discharged from the condenser, entering an evaporation condenser from the refrigerant subjected to throttling and pressure reduction by the first electronic expansion valve, exchanging heat with a low-temperature stage refrigeration system in the evaporation condenser and evaporating the refrigerant, entering a second evaporator from the refrigerant subjected to throttling and pressure reduction by the third electronic expansion valve, exchanging heat with a circulating fluid in the second evaporator and evaporating the refrigerant, mixing the gaseous refrigerant evaporated by the evaporation condenser and the second evaporator and returning to the high-temperature stage compressor to complete high-temperature stage circulation, wherein the circulating fluid obtained by heat exchange of the second evaporator is a high-temperature fluid; the low-temperature-stage compressor discharges high-temperature and high-pressure refrigerant, the refrigerant enters the evaporative condenser, the refrigerant exchanges heat with the high-temperature-stage system in the evaporative condenser and is condensed into high-pressure liquid, the liquid discharged from the evaporative condenser is throttled and depressurized by the second electronic expansion valve and then enters the first evaporator, the refrigerant exchanges heat with circulating fluid in the first evaporator and is evaporated, the evaporated gaseous refrigerant returns to the low-temperature-stage compressor to complete low-temperature-stage circulation, and the circulating fluid prepared by the first evaporator through heat exchange is low-temperature fluid; finally, the high-temperature circulating fluid prepared by the heat exchange of the second evaporator and the low-temperature circulating fluid prepared by the heat exchange of the first evaporator are mixed to prepare medium-temperature fluid;
low-temperature refrigeration working condition circulation: closing the first low-temperature electromagnetic valve, opening the second low-temperature electromagnetic valve, discharging high-temperature and high-pressure refrigerant from the high-temperature stage compressor, allowing the refrigerant to enter a condenser, exchanging heat with plant water in the condenser, condensing the refrigerant into high-pressure liquid, throttling and depressurizing the liquid from the condenser through a first electronic expansion valve, allowing the liquid to enter an evaporative condenser, allowing the refrigerant to exchange heat with a low-temperature stage system in the evaporative condenser and evaporate, returning the evaporated gaseous refrigerant to the high-temperature stage compressor, and completing high-temperature stage circulation; the low-temperature stage compressor discharges high-temperature and high-pressure refrigerant, the refrigerant enters the evaporative condenser, the refrigerant exchanges heat with the high-temperature stage system in the evaporative condenser and is condensed into high-pressure liquid, the liquid discharged from the evaporative condenser enters the first evaporator after being throttled and depressurized by the second electronic expansion valve, the refrigerant exchanges heat with circulating fluid in the first evaporator and is evaporated, the evaporated gaseous refrigerant returns to the low-temperature stage compressor, low-temperature stage circulation is completed, and the prepared circulating fluid is low-temperature fluid.
9. The control method of the wide temperature range overlapping precise temperature control heat exchange system according to claim 1, characterized in that: in the processes of high-temperature refrigeration working condition circulation, medium-temperature refrigeration working condition circulation and low-temperature refrigeration working condition circulation, the temperature of the circulating fluid is detected through the temperature sensor, and the switching proportions of the first electronic expansion valve, the second electronic expansion valve and the third electronic expansion valve are correspondingly adjusted according to the detected temperature of the circulating fluid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010036737.4A CN111197873A (en) | 2020-01-14 | 2020-01-14 | Wide-temperature-range overlapping precise temperature control heat exchange system and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010036737.4A CN111197873A (en) | 2020-01-14 | 2020-01-14 | Wide-temperature-range overlapping precise temperature control heat exchange system and control method thereof |
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| CN111197873A true CN111197873A (en) | 2020-05-26 |
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| CN112306116A (en) * | 2020-10-29 | 2021-02-02 | 北京京仪自动化装备技术有限公司 | Semiconductor temperature control system |
| CN114593535A (en) * | 2020-12-07 | 2022-06-07 | 浙江盾安冷链系统有限公司 | Multi-temperature-zone refrigeration and heating integrated system and control method thereof |
| CN114608213A (en) * | 2022-03-18 | 2022-06-10 | 珠海市精实测控技术有限公司 | High-low temperature working condition cascade refrigeration system and control method thereof |
| CN115129092A (en) * | 2022-03-22 | 2022-09-30 | 无锡暖芯半导体科技有限公司 | Temperature control system for semiconductor wafer manufacturing |
| CN115167561A (en) * | 2022-06-30 | 2022-10-11 | 北京京仪自动化装备技术股份有限公司 | Wide-temperature-range overlapping temperature control system and temperature control method |
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Application publication date: 20200526 |