CN105650921A - Dual-stage compression refrigeration circulating system for cooling flashing gas bypass in stepped mode - Google Patents
Dual-stage compression refrigeration circulating system for cooling flashing gas bypass in stepped mode Download PDFInfo
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- CN105650921A CN105650921A CN201610181195.3A CN201610181195A CN105650921A CN 105650921 A CN105650921 A CN 105650921A CN 201610181195 A CN201610181195 A CN 201610181195A CN 105650921 A CN105650921 A CN 105650921A
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- gas
- gas bypass
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- port
- heat exchanger
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Classifications
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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
- F25B1/00—Compression machines, plants or systems with non-reversible cycle
- F25B1/10—Compression machines, plants or systems with non-reversible cycle with multi-stage compression
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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
- F25B41/40—Fluid line arrangements
-
- 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
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
Abstract
The invention discloses a dual-stage compression refrigeration circulating system for cooling a flashing gas bypass in a stepped mode. High-temperature gas refrigerant discharged by a high-pressure compressor enters a gas cooler to be primarily cooled, then gas refrigerant sequentially passes a flashing gas bypass external heat exchanger, an internal heat exchanger and a flashing gas bypass internal heat exchanger to be sufficiently cooled, and finally refrigerant gas passing through the flashing gas bypass external heat exchanger and refrigerant gas passing through the internal heat exchanger are input to a low-pressure compressor after being mixed. The key problems that CO2 refrigeration circulating throttling loss is large and circulating efficiency is low are solved, the efficiency of the CO2 trans-critical refrigeration circulating system is greatly improved, and the use range of the system is widened.
Description
Technical field
The present invention relates to CO2As the two-stage compression cooling cycle system of cold-producing medium, specifically, it is a kind of two-stage compression refrigeration blood circulation dodging gas bypass step cooling.
Background technology
Climate change is the significant problem that mankind nowadays society faces, synthetic cold-producing medium fluorochlorohydrocarbon (CFCs) and hydrogen fluorochlorohydrocarbon (HCFCs) class material damage ozone layer and have higher greenhouse effect, and the replacement work of cold-producing medium is shouldered heavy responsibilities. From the point of long-term development, refrigerated air-conditioning system uses natural refrigerant could fundamentally solve refrigerant replacement problem, it is achieved the environmental objective of refrigerated air-conditioning system. In view of this situation, CO2Refrigeration system becomes the study hotspot of current refrigerating and air conditioning industry.
At present, many countries have begun to CO2Refrigerated air-conditioning system carries out studying and applying. In developed country, the application CO such as supermarket display cases, air conditioning for automobiles, automatic vending machine2The existing trend replacing HFCs cold-producing medium.
Although CO2Refrigeration and air-conditioning technical has been applied to multiple field, but CO2The key issue of trans critical cycle refrigeration system is solved not yet at all, and namely restriction loss is big, and operating pressure is high, and system effectiveness is low, 1/4-1/3 lower than the R134a system of routine. From the technical point of view, supercritical CO can be exported with gas cooler2The approach such as the cooling of fluid, sudden strain of a muscle gas bypass refrigeration circulation can improve CO2Refrigerant system efficiency. Sum up and find, CO2The cooling of kind of refrigeration cycle can be realized by following several ways: 1) the heat exchanger type of cooling; 2) the special type of cooling; 3) other type of cooling. Although adopting the special type of cooling can improve CO2The COP of kind of refrigeration cycle, but the special type of cooling needs to increase the kind of refrigeration cycle of a set of auxiliary, improves cost, adds system circulation complexity.
In the other type of type of cooling, as adopted ice-melt cooler to reduce gas cooler outlet CO2Temperature, Application of Solar Energy is in CO2Trans-critical cycle kind of refrigeration cycle cooling procedure. But the both the above type of cooling is comparatively strict to Applicative time and condition, and popularization and application tool acquires a certain degree of difficulty. By comparative analysis, the heat exchanger type of cooling based on kind of refrigeration cycle itself is easier to realize and control, and is improve CO2Trans-critical cycle cooling cycle system efficiency, widen its use scope feasible measure.
Summary of the invention
The technical problem to be solved is, CO2The problem that kind of refrigeration cycle restriction loss is big and cycle efficieny is relatively low, it is provided that a kind of two-stage compression refrigeration blood circulation dodging gas bypass step cooling.
The present invention is achieved through the following technical solutions:
A kind of two-stage compression refrigeration blood circulation dodging gas bypass step cooling, it is characterized in that, the outlet side of low-pressure stage compressor is connected with intercooler entrance point, the port of export of described intercooler is connected with the entrance point of high pressure stage compressor, the described high pressure stage compressor port of export is connected with gas cooler entrance point, the described gas cooler port of export is connected with the high temperature fluid arrival end dodging gas bypass external heat exchanger, the described high temperature fluid port of export dodging gas bypass external heat exchanger is connected with the high temperature fluid arrival end of internal exchanger, the high temperature fluid port of export of described internal exchanger is connected with dodging gas bypass internal exchanger arrival end, the described sudden strain of a muscle gas bypass internal exchanger port of export is connected with choke valve arrival end, the described choke valve port of export be connected gas-liquid separator T-shaped with described impact is connected, it is connected with evaporator inlet end bottom the T-shaped connection gas-liquid separator of described impact, described evaporator outlet end is connected with the cry-fluid inlet end of internal exchanger, the cryogenic fluid outlet end of described internal exchanger is connected with the port of export of low-pressure stage compressor, described T-shaped connection gas-liquid separator top of impacting is connected with the cry-fluid inlet end of sudden strain of a muscle gas bypass external heat exchanger, the described cryogenic fluid outlet end dodging gas bypass external heat exchanger is connected with dodging gas bypass regulator valve arrival end, the described sudden strain of a muscle gas bypass regulator valve port of export is connected with low-pressure stage suction port of compressor end.
The present invention has following technical effect that
1. the present invention and traditional two grades of CO2Two-stage compression system is compared, and which solves CO2The key issue that kind of refrigeration cycle restriction loss is big and cycle efficieny is relatively low, substantially increases CO2Trans-critical cycle cooling cycle system efficiency, widen its use scope.
2. flash gas is made directly and bypasses to compressor air suction mouth by the present invention, making evaporator inlet be entirely liquid refrigerant, thus realizing the uniform distribution of vaporizer inner refrigerant, reducing the pressure loss in vaporizer, strengthening refrigerant side heat transfer process, thus improving refrigerant system efficiency.
3. supercritical CO2The two-phase section that the conventional refrigerants that avoids fluid experiences, this makes in design of heat exchanger the heat exchange between different working medium have better thermal matching, reduces diabatic process " fire with " loss. Under identical pinch point temperature, the supercritical CO of gas cooler outlet2Fluid is cooled dodging gas bypass external heat exchanger, internal exchanger and sudden strain of a muscle gas bypass internal exchanger respectively, and the working medium of heat exchange both sides keeps good " heat is followed " so that it is diabatic process has less " fire with " loss and " fire with " loss.
Accompanying drawing explanation
Fig. 1 is principles of the invention schematic diagram.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, native system is described in detail.
As shown in Figure 1, the outlet side of low-pressure stage compressor 1 is connected with intercooler 2 entrance point, the port of export of described intercooler 2 is connected with the entrance point of high pressure stage compressor 3, described high pressure stage compressor 3 port of export is connected with gas cooler 4 entrance point, described gas cooler 4 port of export is connected with the high temperature fluid arrival end dodging gas bypass external heat exchanger 5, the described high temperature fluid port of export dodging gas bypass external heat exchanger 5 is connected with the high temperature fluid arrival end of internal exchanger 6, the high temperature fluid port of export of described internal exchanger 6 is connected with dodging gas bypass internal exchanger 7 arrival end, described sudden strain of a muscle gas bypass internal exchanger 7 port of export is connected with choke valve 8 arrival end, described choke valve 8 port of export be connected gas-liquid separator 9 T-shaped with described impact is connected, it is connected with vaporizer 10 arrival end bottom the T-shaped connection gas-liquid separator 9 of described impact, described vaporizer 10 port of export is connected with the cry-fluid inlet end of internal exchanger 6, the cryogenic fluid outlet end of described internal exchanger 6 is connected with the port of export of low-pressure stage compressor 1, described T-shaped connection gas-liquid separator 9 top of impacting is connected with the cry-fluid inlet end of sudden strain of a muscle gas bypass external heat exchanger 5, the described cryogenic fluid outlet end dodging gas bypass external heat exchanger 5 is connected with dodging gas bypass regulator valve 11 arrival end, described sudden strain of a muscle gas bypass regulator valve 11 port of export is connected with low-pressure stage compressor 1 arrival end.
The T-shaped connection gas-liquid separator of described impact, the flash gas of throttling process is carried out gas-liquid separation, bottom liquid enters into vaporizer, and top is connected with dodging gas bypass external heat exchanger, and the steam through gas cooler is cooled down by top cryogenic gas out further. Impact T-shaped connection gas-liquid separator and the liquid phase part of gas-liquid refrigerant can be intercepted (improving gas-liquid separation efficiency) and internal exchanger outlet supercritical fluid CO 2 heat exchange.
Described sudden strain of a muscle gas bypass external heat exchanger, carries out heat exchange by impacting T-shaped connection gas-liquid separator Low Temperature Steam out with the high-temperature gas through gas cooler, and then Low Temperature Steam is by dodging gas bypass regulator valve.
Described internal exchanger, carries out heat exchange by vaporizer Low Temperature Steam out with the high-temperature steam through dodging gas bypass external heat exchanger, and after cooling, high temperature CO 2 steam enters into the T-shaped connection gas-liquid separator of impact and cools down further.
Described sudden strain of a muscle gas bypass internal exchanger, utilizes the cryogenic gas cold-producing medium in gas-liquid separator that the high-temperature gas steam come by internal exchanger is further cooled down.
The operation principle that the present invention dodges in the two-stage compression refrigeration blood circulation of gas bypass step cooling is as follows: the high-temperature gas cold-producing medium discharged by low-pressure machine compressor enters intercooler and tentatively cools down, and the high-temperature gas cold-producing medium then discharged after high pressure stage compressor compresses sequentially passes through gas cooler, dodges gas bypass external heat exchanger, internal exchanger, is dodge gas bypass internal exchanger to be adequately cooled. Then the flash gas that refrigerant gas produces after throttling carries out gas-liquid separation by impacting T-shaped connection, CO after utilizing separation process and separating2The supercritical CO that gas cooler is exported by low temperature low pressure gas2Cooling, improves refrigeration cycle efficiency. It is respectively provided with heat exchanger gas-liquid separator (diverter) is inside and outside for improving gas-liquid separation efficiency, being referred to as dodge gas bypass internal exchanger and dodge gas bypass external heat exchanger, the Main Function wherein dodging gas bypass internal exchanger is that the liquid phase part to gas-liquid refrigerant intercepts (improving gas-liquid separation efficiency) and internal exchanger outlet supercritical CO2Fluid heat transfer; The Main Function dodging gas bypass external heat exchanger is by sudden strain of a muscle gas bypass gases and gas cooler outlet supercritical CO2Fluid heat transfer, arranges reduction supercritical CO by two heat exchangers2The temperature of fluid. Additionally, system is also provided with internal exchanger, by the low temperature CO of evaporator outlet2Fluid and the high temperature CO dodging gas bypass external heat exchanger outlet2Fluid carries out heat exchange, further to CO2Fluid cools down.
Claims (1)
1. the two-stage compression refrigeration blood circulation dodging gas bypass step cooling, it is characterized in that, the outlet side of low-pressure stage compressor (1) is connected with intercooler (2) entrance point, the port of export of described intercooler (2) is connected with the entrance point of high pressure stage compressor (3), described high pressure stage compressor (3) port of export is connected with gas cooler (4) entrance point, described gas cooler (4) port of export is connected with the high temperature fluid arrival end dodging gas bypass external heat exchanger (5), the high temperature fluid port of export of described sudden strain of a muscle gas bypass external heat exchanger (5) is connected with the high temperature fluid arrival end of internal exchanger (6), the high temperature fluid port of export of described internal exchanger (6) is connected with dodging gas bypass internal exchanger (7) arrival end, described sudden strain of a muscle gas bypass internal exchanger (7) port of export is connected with choke valve (8) arrival end, described choke valve (8) port of export be connected gas-liquid separator (9) T-shaped with described impact is connected, T-shaped connection gas-liquid separator (9) bottom of described impact is connected with vaporizer (10) arrival end, described vaporizer (10) port of export is connected with the cry-fluid inlet end of internal exchanger (6), the cryogenic fluid outlet end of described internal exchanger (6) is connected with the port of export of low-pressure stage compressor (1), described impact T-shaped connection gas-liquid separator (9) top is connected with the cry-fluid inlet end dodging gas bypass external heat exchanger (5), the cryogenic fluid outlet end of described sudden strain of a muscle gas bypass external heat exchanger (5) is connected with dodging gas bypass regulator valve (11) arrival end, described sudden strain of a muscle gas bypass regulator valve (11) port of export is connected with low-pressure stage compressor (1) arrival end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610181195.3A CN105650921A (en) | 2016-03-28 | 2016-03-28 | Dual-stage compression refrigeration circulating system for cooling flashing gas bypass in stepped mode |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610181195.3A CN105650921A (en) | 2016-03-28 | 2016-03-28 | Dual-stage compression refrigeration circulating system for cooling flashing gas bypass in stepped mode |
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| CN105650921A true CN105650921A (en) | 2016-06-08 |
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| CN201610181195.3A Pending CN105650921A (en) | 2016-03-28 | 2016-03-28 | Dual-stage compression refrigeration circulating system for cooling flashing gas bypass in stepped mode |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106766353A (en) * | 2016-12-26 | 2017-05-31 | 天津商业大学 | The refrigeration system of Two-stage Compression and autocascade cycle can be realized |
| CN108248336A (en) * | 2018-01-08 | 2018-07-06 | 中国科学院理化技术研究所 | A kind of heat pump air conditioning system used for electric vehicle |
| CN109869945A (en) * | 2019-03-26 | 2019-06-11 | 天津商业大学 | Absorption critical-cross carbon dioxide double-stage compressive refrigerating system |
| CN109869940A (en) * | 2019-03-26 | 2019-06-11 | 天津商业大学 | Injecting type critical-cross carbon dioxide double-stage compressive refrigerating system |
| CN110080965A (en) * | 2019-04-09 | 2019-08-02 | 中国石油集团济柴动力有限公司成都压缩机分公司 | A kind of multi-level gas compressibility and operation method for supercritical carbon dioxide |
| CN110939569A (en) * | 2018-09-25 | 2020-03-31 | 阿特拉斯·科普柯空气动力股份有限公司 | Oil-injected multistage compressor arrangement and method for controlling a compressor arrangement |
| CN116951800A (en) * | 2023-09-15 | 2023-10-27 | 广东美的暖通设备有限公司 | Control method, control device, dual-cycle refrigeration system and storage medium |
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| CN205561326U (en) * | 2016-03-28 | 2016-09-07 | 天津商业大学 | Dodge gas bypass step refrigerated doublestage compression freezing cycle system |
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| CN101688698A (en) * | 2007-05-14 | 2010-03-31 | 开利公司 | Refrigerant vapor compression system with flash tank economizer |
| JP2010127563A (en) * | 2008-11-28 | 2010-06-10 | Sanden Corp | Refrigerating system |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106766353A (en) * | 2016-12-26 | 2017-05-31 | 天津商业大学 | The refrigeration system of Two-stage Compression and autocascade cycle can be realized |
| CN106766353B (en) * | 2016-12-26 | 2019-11-22 | 天津商业大学 | It is able to achieve the refrigeration system of Two-stage Compression and autocascade cycle |
| CN108248336A (en) * | 2018-01-08 | 2018-07-06 | 中国科学院理化技术研究所 | A kind of heat pump air conditioning system used for electric vehicle |
| CN110939569A (en) * | 2018-09-25 | 2020-03-31 | 阿特拉斯·科普柯空气动力股份有限公司 | Oil-injected multistage compressor arrangement and method for controlling a compressor arrangement |
| CN110939569B (en) * | 2018-09-25 | 2022-02-18 | 阿特拉斯·科普柯空气动力股份有限公司 | Oil-injected multistage compressor arrangement and method for controlling a compressor arrangement |
| CN109869945A (en) * | 2019-03-26 | 2019-06-11 | 天津商业大学 | Absorption critical-cross carbon dioxide double-stage compressive refrigerating system |
| CN109869940A (en) * | 2019-03-26 | 2019-06-11 | 天津商业大学 | Injecting type critical-cross carbon dioxide double-stage compressive refrigerating system |
| CN110080965A (en) * | 2019-04-09 | 2019-08-02 | 中国石油集团济柴动力有限公司成都压缩机分公司 | A kind of multi-level gas compressibility and operation method for supercritical carbon dioxide |
| CN110080965B (en) * | 2019-04-09 | 2020-06-12 | 中国石油集团济柴动力有限公司成都压缩机分公司 | Multistage gas compression system for supercritical carbon dioxide and operation method |
| CN116951800A (en) * | 2023-09-15 | 2023-10-27 | 广东美的暖通设备有限公司 | Control method, control device, dual-cycle refrigeration system and storage medium |
| CN116951800B (en) * | 2023-09-15 | 2024-01-02 | 广东美的暖通设备有限公司 | Control method, control device, dual-cycle refrigeration system and storage medium |
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Application publication date: 20160608 |