CN211823234U - Coupling refrigerating system - Google Patents
Coupling refrigerating system Download PDFInfo
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- CN211823234U CN211823234U CN202020143942.6U CN202020143942U CN211823234U CN 211823234 U CN211823234 U CN 211823234U CN 202020143942 U CN202020143942 U CN 202020143942U CN 211823234 U CN211823234 U CN 211823234U
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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
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Abstract
The utility model discloses a coupling refrigerating system, including silica gel-water absorption formula time matter circulation refrigerating system and CO2A transcritical two-stage compression refrigeration cycle system. The CO is2Transcritical doubleThe stage compression refrigeration circulating system comprises a low-temperature evaporator, a medium-temperature evaporator, a low-pressure compressor, a high-pressure compressor, a parallel compressor, a gas cooler, a cooling evaporator, a high-pressure throttling valve, an intercooler, a medium-pressure throttling valve, a low-pressure throttling valve, a bypass valve, an air heat exchanger and a hot water heater; the silica gel-water adsorption type mass recycling refrigeration system comprises a condenser, a throttle valve, a cooling evaporator, a communication valve, a first check valve, a second check valve, a third check valve, a fourth check valve, a first adsorption bed, a second adsorption bed and a hot water heater, wherein the two systems are coupled through the cooling evaporator, so that the refrigeration capacity is increased and the performance of the system is improved while the waste heat is effectively utilized and the energy consumption is reduced.
Description
Technical Field
The utility model relates to the field of refrigeration technology, more specifically say so, relate to a silica gel-water absorption formula returns matter circulation refrigerating system and CO2And the transcritical double-stage compression refrigeration cycle system is coupled with the refrigeration system.
Background
Since the 20 th century, with the continuous development of the world industry and economy, the problems of energy crisis and environmental pollution have become more severe. Such background has driven the development of a range of energy utilization and environmental protection technologies. Adsorption refrigeration is receiving more and more attention as an environment-friendly refrigeration technology. Meanwhile, due to the depletion of the ozone layer and the continuous deterioration of the greenhouse effect, the related departments have revised Montreal protocol in 1985, Montreal protocol in 1987, London conference in 1990 and Copenhagen conference in 1992, and the worldwide replacement process of CFCs and HCFCs is accelerating and the natural working medium is gaining attention again. In 2016, the international society reached a new Bulgarian amendment around the reduction of the greenhouse gas HFCs under the framework of the Montreal protocol. The natural working medium is paid more attention by people, CO2The use of transcritical refrigeration is gradually trending.
In CO2In the application of the double-stage compression refrigeration cycle system, CO is generated due to the rise of the environmental temperature in summer2The performance of the double-stage compression refrigeration cycle system is reduced, and the refrigeration effect is influenced.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a silica gel-water absorption type recycling cooling-CO aiming at the technical defects in the prior art2A transcritical two-stage compression coupling refrigerating system,the energy consumption is reduced, the refrigerating capacity is increased, and the performance of the system is improved.
For realizing the utility model discloses a technical scheme that the purpose adopted is:
a coupled refrigerating system comprises a silica gel-water adsorption type recycling circulating refrigerating system and CO2A transcritical two-stage compression refrigeration cycle system; the CO is2The transcritical two-stage compression refrigeration circulating system comprises a low-temperature evaporator, a medium-temperature evaporator, a low-pressure compressor, a high-pressure compressor, a parallel compressor, a gas cooler, a cooling evaporator, a high-pressure throttle valve, an intercooler, a medium-pressure throttle valve, a low-pressure throttle valve, a bypass valve, an air heat exchanger and a hot water heater, wherein an outlet of the low-temperature evaporator is connected with an air suction end of the low-pressure compressor, and an exhaust end of the low-temperature compressor is connected with an outlet of the medium-temperature evaporator in parallel and then is respectively connected with an outlet of the bypass valve and an air suction; the gas outlet of the intercooler is respectively connected with the gas suction end of the parallel compressor and the inlet of the bypass valve, the gas exhaust end of the parallel compressor is connected with the gas exhaust end of the high-pressure compressor in parallel and then sequentially connected with the hot water heater and the air heat exchanger, the outlet of the air heat exchanger is divided into two paths, one path is directly connected with the inlet of the refrigerant channel of the cooling evaporator, the other path is connected with the inlet of the refrigerant channel of the cooling evaporator through the gas cooler, the outlet of the refrigerant channel of the cooling evaporator is sequentially connected with the high-pressure throttle valve and the inlet of the intercooler, the liquid outlet of the intercooler is divided into two paths, one path is connected with the inlet of the medium-temperature evaporator through the medium-pressure throttle valve, and the other path is connected with the inlet of the low-temperature evaporator through the low-pressure; the silica gel-water adsorption type recycling refrigeration system comprises a condenser, a throttle valve, a cooling evaporator, a communication valve, a first check valve, a second check valve, a third check valve, a fourth check valve, a first adsorption bed, a second adsorption bed and a hot water heater, wherein the first adsorption bed is respectively connected with an inlet of the first check valve and an outlet of the second check valve, an outlet of the first check valve is respectively connected with an inlet of the condenser and an inlet of the third check valveThe outlet of the condenser, the throttle valve and the solution channel inlet of the cooling evaporator are sequentially connected, the solution channel outlet of the cooling evaporator is respectively connected with the inlet of the fourth one-way valve and the inlet of the second one-way valve, the outlet of the fourth one-way valve is respectively connected with the inlet of the third one-way valve and the second adsorption bed, and the communicating valve for returning mass is arranged between the first adsorption bed and the second adsorption bed; the hot water heater is used for providing heat for the connection of the first adsorption bed and the second adsorption bed respectively; the silica gel-water adsorption type recycling circulating refrigeration system and the CO2The transcritical two-stage compression refrigeration systems are coupled together by the cooled evaporators.
The first adsorption bed and the second adsorption bed are silica gel-water adsorption beds.
The first adsorption bed and the second adsorption bed adopt two-bed reverse circulation.
Compared with the prior art, the beneficial effects of the utility model are that:
1. the utility model discloses a coupling refrigerating system returns matter circulative cooling and CO with silica gel-water absorption formula2The transcritical two-stage compression refrigeration system is coupled through a cooling evaporator, and the silica gel-water adsorption type mass recycling circulation is utilized to cool CO2The refrigerant at the outlet of the transcritical two-stage compressed gas cooler can effectively reduce throttling loss, increase circulating refrigerating capacity and improve refrigerating performance.
2. The utility model discloses a coupling refrigerating system utilizes two adsorption beds of waste heat heating, effectively utilizes the waste heat and has realized CO2And the further cooling of the transcritical double-stage compression system is energy-saving and environment-friendly.
3. The utility model discloses a coupling refrigerating system has solved single-stage compression system and has pressed than too big and arouse the compression to finish the high temperature, leads to a series of problems such as air delivery volume, unit mass refrigerating output, unit volume refrigerating output, refrigeration coefficient decline and compressor consumption increase.
4. The utility model discloses a coupling refrigerating system has satisfied the replacement to CFCs and HCFCs refrigerant, has solved the environment-friendly problem.
Drawings
Fig. 1 is a schematic diagram of a coupling refrigeration system according to the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The principle diagram of the coupled refrigeration system is shown in figure 1, and comprises a silica gel-water adsorption type recycling circulation refrigeration system I and CO2And a transcritical two-stage compression refrigeration cycle system II. The CO is2The transcritical two-stage compression refrigeration cycle system II comprises a low-temperature evaporator 12, a medium-temperature evaporator 10, a low-pressure compressor 1, a high-pressure compressor 3, a parallel compressor 4, a gas cooler 5, a cooling evaporator 8, a high-pressure throttle valve 6, an intercooler 7, a medium-pressure throttle valve 9, a low-pressure throttle valve 11, a bypass valve 2, an air heat exchanger 13 and a hot water heater 14, wherein the outlet of the low-temperature evaporator 12 is connected with the air suction end of the low-pressure compressor 1, and the exhaust end of the low-temperature compressor 1 is connected with the outlet of the medium-temperature evaporator 10 in parallel and then is respectively connected with the outlet of the bypass valve 2 and the air suction end of the high; the gas outlet of the intercooler 7 is connected to the suction side of the parallel compressor 4 and the inlet of the bypass valve 2, the exhaust end of the parallel compressor 4 is connected with the exhaust end of the high-pressure compressor 3 in parallel and then is sequentially connected with the hot water heater 14 and the air heat exchanger 13, the outlet of the air heat exchanger 13 is divided into two paths, one path is directly connected with the inlet of the refrigerant channel of the cooling evaporator 8, the other path is connected with the inlet of the refrigerant channel of the cooling evaporator 8 through the gas cooler 5, the outlet of the refrigerant channel of the cooling evaporator 8 is connected with the inlets of the high-pressure throttle valve 6 and the intercooler 7 in sequence, the liquid outlet of the intercooler 7 is divided into two paths, one path is connected with the inlet of the medium temperature evaporator 10 through the medium pressure throttle valve 9, and the other path is connected with the inlet of the low temperature evaporator 12 through the low pressure throttle valve 11. The silica gel-water adsorption type recycling circulating refrigeration system comprises a condenser 15, a throttle valve 16, the cooling evaporator 8, a communicating valve 22, a first one-way valve 17, a second one-way valve 18, a third one-way valve 19, a fourth one-way valve 20 and a first adsorption deviceA bed 21, a second adsorption bed 23 and the hot water heater 14, wherein the first adsorption bed 21 is connected to an inlet of the first check valve 17 and an outlet of the second check valve 18, respectively, an outlet of the first check valve 17 is connected to an inlet of the condenser 15 and an outlet of the third check valve 19, respectively, an outlet of the condenser 15, the throttle valve 16 and an inlet of the solution passage of the cooling evaporator 8 are sequentially connected, an outlet of the solution passage of the cooling evaporator 8 is connected to an inlet of the fourth check valve 20 and an inlet of the second check valve 18, respectively, and an outlet of the fourth check valve 20 is connected to an inlet of the third check valve 19 and the second adsorption bed 23, respectively. The first adsorption bed 21 is connected in series with the first check valve 17, the condenser 15, the throttle valve 16, the cooling evaporator 8 and the fourth check valve 20 to form a cycle; the second adsorption bed 23 is connected in series with the third check valve 19, the condenser 15, the throttle valve 16, the cooling evaporator 8, and the second check valve 18 to form another cycle. The communication valve 22 for returning the mass is provided between the first adsorption bed 21 and the second adsorption bed 23. The hot water outlet of the hot water heater 14 is connected with the first adsorption bed 21 and the second adsorption bed 23 through valves respectively to provide heat for the first adsorption bed 21 and the second adsorption bed 23. The silica gel-water adsorption type recycling circulating refrigeration system I and the CO2The transcritical two-stage compression refrigeration system II is coupled together through the cooling evaporator 8.
Wherein the first adsorption bed 21 and the second adsorption bed 23 are silica gel-water adsorption beds.
The CO is2The operation process of the transcritical two-stage compression refrigeration cycle system is as follows: the bypass valve 2 is opened under the high-temperature working condition in summer, and is closed in the rest of time. The low-pressure compressor 1 sucks in low-temperature and low-pressure CO coming out of the low-temperature evaporator 122Refrigerant vapor is compressed to intermediate pressure in an isentropic manner, and then enters the high-pressure compressor 3 together with the refrigerant from the intermediate-temperature evaporator 10 to be compressed to high-temperature high-pressure vapor in an isentropic manner continuously; then exchanges heat through the hot water heater and the air heat exchanger, enters the gas cooler 5 for isobaric cooling and releasing heat, and the CO2Transcritical two-stage compressionWhen the refrigeration cycle system is in a hot working condition in summer, in order to reduce the load of the gas cooler, the three-way valve is opened, part of refrigerant vapor bypasses, and the refrigerant vapor enters the cooling evaporator after being mixed with the other path of refrigerant vapor passing through the gas cooler. In order to increase the refrigerating capacity, the silica gel-water adsorption type mass recycling refrigeration system is firstly adopted to carry out mass recycling refrigeration on CO at the outlet of the gas cooler 52The refrigerant vapor is cooled in advance, enters the high-pressure throttle valve 6 for throttling, is cooled and depressurized, then enters the intercooler 7 for gas-liquid separation, one part of the separated refrigerant vapor enters the parallel compressor 4 for isentropic compression at a higher pressure, and the other part of the refrigerant vapor enters the bypass valve 2 for adiabatic throttling to an intermediate pressure and is mixed with the refrigerant superheated vapor coming out of the low-pressure compressor 1 to enter the high-pressure compressor 3; a part of the refrigerant saturated liquid separated from the intercooler 7 passes through the medium-pressure throttle valve 9 for adiabatic throttling to reach an intermediate pressure, then enters the medium-temperature evaporator 10 for isobaric heat absorption and evaporation, and the evaporated refrigerant vapor is mixed with the refrigerant superheated vapor at the outlet of the low-pressure compressor 1 and enters the high-pressure compressor 3; another part of separated saturated liquid of the refrigerant is adiabatically throttled to a low-temperature and low-pressure state by the low-pressure throttle valve 11, enters the low-temperature evaporator 12 for isobaric endothermic evaporation, and finally enters the low-pressure compressor 1 again for circulation.
The operation process of the silica gel-water adsorption type recycling circulating refrigeration system is as follows: the first adsorption bed 21 is filled with water, and when the first adsorption bed 21 is heated, the water adsorbed by the silica gel obtains energy; when the movement of water molecules is accelerated enough to overcome the attraction force of the silica gel, the water molecules are separated (desorbed) from the surface of the silica gel, pass through the first one-way valve 17, enter the condenser 15 for cooling and condensation to release heat, then pass through the throttling valve 16 for adiabatic throttling, reduce the temperature and pressure, enter the cooling evaporator 8 for isobaric heat absorption and evaporation, and then pass through the fourth one-way valve 20, and the water vapor with low temperature and low pressure is adsorbed by the cooled second adsorption bed 23 again. The first adsorption bed 21 and the second adsorption bed 23 adopt a two-bed reverse cycle, that is, when the first adsorption bed 21 is heated, the second adsorption bed 23 is cooled; when the first adsorption bed 21 is cooled, the second adsorption bed 23 starts to be heated. When the second adsorption bed is heated, the water adsorbed by the silica gel obtains energy; when the water molecule movement is accelerated enough to overcome the attraction force of the silica gel, the water molecules are separated (desorbed) from the surface of the silica gel, pass through the third one-way valve 19, enter the condenser 15 for cooling and condensation to release heat, then pass through the throttling valve 16 for adiabatic throttling, reduce the temperature and pressure, enter the cooling evaporator 8 for isobaric heat absorption and evaporation, and then pass through the second one-way valve 18, and the water vapor with low temperature and low pressure is adsorbed by the cooled first adsorption bed 21 again. When the first adsorption bed 21 and the second adsorption bed 23 are respectively at the end of the cycle half cycle, the temperature and the pressure of the first adsorption bed 21 are high, and the second adsorption bed 23 is in a low-temperature and low-pressure state, the two beds can be communicated through the communication valve 22 for quality recovery, so that high-temperature and high-pressure steam in the first adsorption bed 21 can enter the second adsorption bed 23; thus, the first adsorption bed pressure is reduced and self-desorption is promoted, while the second adsorption bed 23 is increased in pressure and adsorption amount is increased until the two beds are in pressure equilibrium, and the quality recovery is finished.
The utility model discloses a coupling refrigerating system passes through cooling evaporator 8 will silica gel-water absorption formula returns matter circulation refrigerating system I with CO2And the transcritical two-stage compression refrigerating system II is coupled together. CO passing to gas cooler outlet2Refrigerant vapor is subcooled, throttling loss can be effectively reduced, circulating refrigerating capacity is increased, and circulating COP is improved. Moreover, a large amount of waste heat is directly wasted in the world every year, and the waste energy can be relieved to a certain extent by adopting a silica gel-water adsorption type recycling refrigeration cycle system and heating an adsorption bed by using the waste heat.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.
Claims (3)
1. A coupled refrigerating system is characterized by comprising a silica gel-water adsorption type mass recycling circulating refrigerating system and CO2A transcritical two-stage compression refrigeration cycle system; the CO is2The transcritical two-stage compression refrigeration circulating system comprises a low-temperature evaporator, a medium-temperature evaporator, a low-pressure compressor, a high-pressure compressor, a parallel compressor, a gas cooler, a cooling evaporator, a high-pressure throttle valve, an intercooler, a medium-pressure throttle valve, a low-pressure throttle valve, a bypass valve, an air heat exchanger and a hot water heater, wherein an outlet of the low-temperature evaporator is connected with an air suction end of the low-pressure compressor, and an exhaust end of the low-pressure compressor is connected with an outlet of the medium-temperature evaporator in parallel and then is respectively connected with an outlet of the bypass valve and an air suction; the gas outlet of the intercooler is respectively connected with the gas suction end of the parallel compressor and the inlet of the bypass valve, the gas exhaust end of the parallel compressor is connected with the gas exhaust end of the high-pressure compressor in parallel and then sequentially connected with the hot water heater and the air heat exchanger, the outlet of the air heat exchanger is divided into two paths, one path is directly connected with the inlet of the refrigerant channel of the cooling evaporator, the other path is connected with the inlet of the refrigerant channel of the cooling evaporator through the gas cooler, the outlet of the refrigerant channel of the cooling evaporator is sequentially connected with the high-pressure throttle valve and the inlet of the intercooler, the liquid outlet of the intercooler is divided into two paths, one path is connected with the inlet of the medium-temperature evaporator through the medium-pressure throttle valve, and the other path is connected with the inlet of the low-temperature evaporator through the low-pressure; the silica gel-water adsorption type recycling refrigeration system comprises a condenser, a throttle valve, a cooling evaporator, a communication valve, a first check valve, a second check valve, a third check valve, a fourth check valve, a first adsorption bed, a second adsorption bed and a hot water heater, wherein the first adsorption bed is respectively connected with an inlet of the first check valve and an outlet of the second check valve, an outlet of the first check valve is respectively connected with an inlet of the condenser and an outlet of the third check valve, an outlet of the condenser is connected with the throttle valve, and a solution channel of the cooling evaporator enters the throttle valveThe ports are sequentially connected, the outlet of a solution channel of the cooling evaporator is respectively connected with the inlet of the fourth one-way valve and the inlet of the second one-way valve, the outlet of the fourth one-way valve is respectively connected with the inlet of the third one-way valve and the second adsorption bed, and the communicating valve for returning mass is arranged between the first adsorption bed and the second adsorption bed; the hot water heater is used for providing heat for the connection of the first adsorption bed and the second adsorption bed respectively; the silica gel-water adsorption type recycling circulating refrigeration system and the CO2The transcritical two-stage compression refrigeration systems are coupled together by the cooled evaporators.
2. The coupled refrigeration system of claim 1, wherein the first and second adsorbent beds are silica gel-water adsorbent beds.
3. The coupled refrigeration system of claim 1, wherein the first adsorption bed and the second adsorption bed employ a two-bed reverse cycle.
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| CN111141046A (en) * | 2020-01-22 | 2020-05-12 | 天津商业大学 | Coupling refrigerating system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111141046A (en) * | 2020-01-22 | 2020-05-12 | 天津商业大学 | Coupling refrigerating system |
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