CN111306826A - Oil return device and oil return method of transcritical carbon dioxide pump liquid supply refrigeration system - Google Patents
Oil return device and oil return method of transcritical carbon dioxide pump liquid supply refrigeration system Download PDFInfo
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- CN111306826A CN111306826A CN201911356862.7A CN201911356862A CN111306826A CN 111306826 A CN111306826 A CN 111306826A CN 201911356862 A CN201911356862 A CN 201911356862A CN 111306826 A CN111306826 A CN 111306826A
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- exhaust
- oil return
- carbon dioxide
- electromagnetic
- way valve
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 102
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 51
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 51
- 239000007788 liquid Substances 0.000 title claims abstract description 40
- 238000005057 refrigeration Methods 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims 1
- 229910052799 carbon Inorganic materials 0.000 claims 1
- 238000002360 preparation method Methods 0.000 claims 1
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 238000001704 evaporation Methods 0.000 description 4
- 230000008020 evaporation Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
Images
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
- F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
- F25B9/002—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant
- F25B9/008—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant the refrigerant being carbon dioxide
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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
- F25B31/00—Compressor arrangements
- F25B31/002—Lubrication
- F25B31/004—Lubrication oil recirculating 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
- F25B43/02—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat for separating lubricants from the refrigerant
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Analytical Chemistry (AREA)
- Power Engineering (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
Abstract
The invention relates to an oil return device of a carbon dioxide refrigeration system, in particular to an oil return device of a transcritical carbon dioxide pump liquid supply refrigeration system, which comprises a temperature sensor, an exhaust precooler and an electromagnetic three-way valve, wherein the electromagnetic three-way valve is provided with two inlets and one outlet; an air outlet of the low-temperature compressor is respectively connected with an air inlet of an exhaust precooler and one inlet of an electromagnetic three-way valve, and an air outlet of the exhaust precooler is connected with the other inlet of the electromagnetic three-way valve; the outlet of the electromagnetic three-way valve is connected with the air inlet of the oil return plate type heat exchanger; the temperature sensor is arranged between the exhaust port of the low-temperature compressor and the exhaust precooler. The oil return device of the transcritical carbon dioxide pump liquid supply refrigeration system provided by the invention has the advantages of simple structure, convenience in use and reliability in control, and meets the normal oil return requirement of the transcritical carbon dioxide pump liquid supply refrigeration system under the conditions of not increasing extra energy consumption and not damaging the service life of an oil return evaporator.
Description
Technical Field
The invention relates to an oil return device of a carbon dioxide refrigeration system, in particular to an oil return device of a transcritical carbon dioxide pump liquid supply refrigeration system and an oil return method thereof.
Background
At present, a transcritical carbon dioxide refrigerating system generally adopts a medium-temperature compressor to exhaust gas and an oil return plate type evaporator for heat exchange. The working principle is as follows:
a path of liquid is taken from a liquid supply outlet of the carbon dioxide liquid pump and is subjected to heat exchange with high-temperature and high-pressure exhaust of the medium-temperature compressor through a plate heat exchanger. The carbon dioxide liquid is vaporized and the remaining oil is carried back to the suction side of the cryogenic compressor under the flow of carbon dioxide gas, thereby returning the oil to the compressor.
The problems that exist are that:
the medium temperature compressor works in a trans-critical pressure area, so that the high-pressure side pressure of the plate heat exchanger can reach 120bar, and the liquid supply pressure is about 10 to 20bar, so that the pressure difference is very large, the mechanical stress is high, and the reliability of the plate heat exchanger is not facilitated.
The medium temperature compressor works in a trans-critical pressure area, so the exhaust temperature is as high as 100-120 ℃, the evaporation temperature of the plate heat exchanger is-15 to-35 ℃, and the heat exchange temperature difference is large. The great temperature difference causes the thermal stress of the plate heat exchanger to be very high, thereby greatly reducing the safety of the heat exchanger and prolonging the service life of the heat exchanger.
Disclosure of Invention
In order to solve the problems, the invention provides an oil return device of a transcritical carbon dioxide pump liquid supply refrigeration system, which meets the normal oil return requirement of the transcritical carbon dioxide pump liquid supply refrigeration system under the conditions of not increasing extra energy consumption and not damaging the service life of an oil return evaporator, and the specific technical scheme is as follows:
the oil return device of the liquid supply refrigeration system of the transcritical carbon dioxide pump comprises a temperature sensor, an exhaust precooler and an electromagnetic three-way valve, wherein the electromagnetic three-way valve is provided with two inlets and one outlet; an air outlet of the low-temperature compressor is respectively connected with an air inlet of an exhaust precooler and one inlet of an electromagnetic three-way valve, and an air outlet of the exhaust precooler is connected with the other inlet of the electromagnetic three-way valve; the outlet of the electromagnetic three-way valve is connected with the air inlet of the oil return plate type heat exchanger; the temperature sensor is arranged between the exhaust port of the low-temperature compressor and the exhaust precooler.
The oil return method of the liquid supply refrigeration system of the transcritical carbon dioxide pump comprises the following steps:
detecting the exhaust temperature of the low-temperature compressor;
when the exhaust temperature of the low-temperature compressor is lower than 30 ℃, the electromagnetic three-way valve directly guides the exhaust of the low-temperature compressor into the air inlet of the oil return plate type heat exchanger;
when the exhaust temperature of the low-temperature compressor is not lower than 30 ℃, the electromagnetic tee joint enables the air outlet of the exhaust precooler to be communicated with the oil return plate type heat exchanger, exhaust of the low-temperature compressor is introduced into the exhaust precooler for precooling, the exhaust precooler removes part of superheat degree of carbon dioxide gas, the carbon dioxide gas removed part of superheat degree enters the oil return plate type heat exchanger through the electromagnetic three-way valve, the carbon dioxide gas removed part of superheat degree exchanges heat with carbon dioxide liquid in the oil return plate type heat exchanger, the carbon dioxide liquid is completely evaporated, and residual oil after the carbon dioxide liquid is evaporated is brought back to the low-temperature compressor by the carbon dioxide gas.
Analysis shows that compared with a medium-temperature compressor, the low-temperature compressor works in a subcritical region, so that the exhaust pressure of the low-temperature compressor is 20-40 bar, the exhaust temperature of the low-temperature compressor is 30-60 ℃, and the plate heat exchanger for heating oil return is very suitable. The working principle of the invention is thus as follows: the exhaust gas of the low-temperature compressor is precooled, and after a certain superheat degree is removed, the exhaust gas is sent into an oil return plate type heat exchanger to exchange heat with carbon dioxide liquid. After complete vaporization of the carbon dioxide liquid, the oil is carried back to the cryogenic compressor by the carbon dioxide gas flow. Meanwhile, an electric three-way valve is arranged between the exhaust precooler and the oil return plate type heat exchanger. When the exhaust temperature is lower than 30 ℃, the three-way valve directly guides the exhaust into the oil return plate heat exchanger, thereby ensuring that enough heat is available for evaporating the carbon dioxide liquid in the oil return plate heat exchanger.
Compared with the prior art, the invention has the following beneficial effects:
the oil return device of the transcritical carbon dioxide pump liquid supply refrigeration system provided by the invention has the advantages of simple structure, convenience in use and reliability in control, and meets the normal oil return requirement of the transcritical carbon dioxide pump liquid supply refrigeration system under the conditions of not increasing extra energy consumption and not damaging the service life of an oil return evaporator.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Detailed Description
The invention will now be further described with reference to the accompanying drawings.
As shown in fig. 1, the transcritical carbon dioxide pump liquid supply refrigeration system comprises a low-temperature compressor 1, an oil return plate-type heat exchanger 2, a medium-temperature compressor 31, a gas cooler 32, a low-pressure circulating barrel 33, a carbon dioxide liquid pump 35, a low-temperature evaporator 37, a liquid storage device, a first expansion valve 34 arranged between the liquid storage device and the low-pressure circulating barrel 33, and a second expansion valve 36 arranged at an inlet of the low-temperature evaporator 37.
The oil return device of the liquid supply refrigeration system of the transcritical carbon dioxide pump comprises a temperature sensor 5, an exhaust precooler 4 and an electromagnetic three-way valve 6, wherein the electromagnetic three-way valve 6 is provided with two inlets and one outlet; an air outlet of the low-temperature compressor 1 is respectively connected with an air inlet of the exhaust precooler 4 and one inlet of the electromagnetic three-way valve 6, and an air outlet of the exhaust precooler 4 is connected with the other inlet of the electromagnetic three-way valve 6; the outlet of the electromagnetic three-way valve 6 is connected with the air inlet of the oil return plate type heat exchanger 2; the temperature sensor 5 is installed between the discharge port of the cryogenic compressor 1 and the discharge precooler 4.
The oil return method of the liquid supply refrigeration system of the transcritical carbon dioxide pump comprises the following steps:
detecting the exhaust temperature of the low-temperature compressor 1;
when the exhaust temperature of the low-temperature compressor 1 is lower than 30 ℃, the electromagnetic three-way valve 6 directly guides the exhaust of the low-temperature compressor 1 into the air inlet of the oil return plate type heat exchanger 2;
when the exhaust temperature of the low-temperature compressor 1 is not lower than 30 ℃, the electromagnetic three-way valve 6 enables the air outlet of the exhaust precooler 4 to be communicated with the oil return plate-type heat exchanger 2, the exhaust of the low-temperature compressor 1 is introduced into the exhaust precooler 4 for precooling, the exhaust precooler 4 removes part of superheat degree of carbon dioxide gas, the carbon dioxide gas from which part of superheat degree is removed enters the oil return plate-type heat exchanger 2 through the electromagnetic three-way valve 6, the carbon dioxide gas from which part of superheat degree is removed exchanges heat with carbon dioxide liquid in the oil return plate-type heat exchanger 2, the carbon dioxide liquid is completely evaporated, and residual oil after the carbon dioxide liquid is evaporated is brought back to the low.
Through analysis, compared with a medium-temperature compressor, the low-temperature compressor 1 works in a subcritical region, so that the exhaust pressure is 20-40 bar, the exhaust temperature is 30-60 ℃, and the plate heat exchanger 2 for heating oil return is very suitable. The working principle of the invention is thus as follows: the exhaust gas of the low-temperature compressor 1 is precooled, and after a certain superheat degree is removed, the exhaust gas is sent to the oil return plate type heat exchanger 2 to exchange heat with the carbon dioxide liquid. After complete evaporation of the carbon dioxide liquid, the oil is carried back to the cryogenic compressor 1 by the carbon dioxide gas flow. Meanwhile, an electric three-way valve is arranged between the exhaust precooler 4 and the oil return plate type heat exchanger 2. When the exhaust temperature is lower than 30 ℃, the three-way valve directly guides the exhaust into the oil return plate type heat exchanger 2, thereby ensuring that enough heat is available for evaporating the carbon dioxide liquid in the oil return plate type heat exchanger 2.
Claims (2)
1. The oil return device of the liquid supply refrigeration system of the transcritical carbon dioxide pump comprises a temperature sensor, an exhaust precooler and an electromagnetic three-way valve, wherein the electromagnetic three-way valve is provided with two inlets and one outlet; it is characterized in that the preparation method is characterized in that,
an air outlet of the low-temperature compressor is respectively connected with an air inlet of an exhaust precooler and one inlet of an electromagnetic three-way valve, and an air outlet of the exhaust precooler is connected with the other inlet of the electromagnetic three-way valve; the outlet of the electromagnetic three-way valve is connected with the air inlet of the oil return plate type heat exchanger; the temperature sensor is arranged between the exhaust port of the low-temperature compressor and the exhaust precooler.
2. The oil return method of the liquid supply refrigeration system of the transcritical carbon dioxide pump is characterized by comprising the following steps of:
detecting the exhaust temperature of the low-temperature compressor;
when the exhaust temperature of the low-temperature compressor is lower than 30 ℃, the electromagnetic three-way valve directly guides the exhaust of the low-temperature compressor into the air inlet of the oil return plate type heat exchanger;
when the exhaust temperature of the low-temperature compressor is not lower than 30 ℃, the electromagnetic three-way valve enables the air outlet of the exhaust precooler to be communicated with the oil return plate type heat exchanger, the exhaust of the low-temperature compressor is introduced into the exhaust precooler for precooling, the exhaust precooler removes part of superheat degree of carbon dioxide gas, the carbon dioxide gas from which part of superheat degree is removed enters the oil return plate type heat exchanger through the electromagnetic three-way valve, the carbon dioxide gas from which part of superheat degree is removed exchanges heat with carbon dioxide liquid in the oil return plate type heat exchanger, the carbon dioxide liquid is completely evaporated, and residual oil after the carbon dioxide liquid is evaporated is brought back to the low-temperature compressor by the carbon.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911356862.7A CN111306826A (en) | 2019-12-25 | 2019-12-25 | Oil return device and oil return method of transcritical carbon dioxide pump liquid supply refrigeration system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911356862.7A CN111306826A (en) | 2019-12-25 | 2019-12-25 | Oil return device and oil return method of transcritical carbon dioxide pump liquid supply refrigeration system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111306826A true CN111306826A (en) | 2020-06-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911356862.7A Pending CN111306826A (en) | 2019-12-25 | 2019-12-25 | Oil return device and oil return method of transcritical carbon dioxide pump liquid supply refrigeration system |
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| CN (1) | CN111306826A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000046420A (en) * | 1998-07-31 | 2000-02-18 | Zexel Corp | Refrigeration cycle |
| CN101893343A (en) * | 2010-06-24 | 2010-11-24 | 中国科学院理化技术研究所 | Multi-element mixed working medium throttling refrigerator with deeply separated refrigerant and lubricating oil |
| CN203893503U (en) * | 2014-05-15 | 2014-10-22 | 济南神华制冷设备有限公司 | Barrel pump unit forced oil return device |
| CN205580037U (en) * | 2016-04-14 | 2016-09-14 | 福建欣隆环保有限公司 | Supercritical carbon dioxide heat pump return oil system is striden to industrial, commercial MW level |
| CN106918160A (en) * | 2017-04-20 | 2017-07-04 | 郑州云宇新能源技术有限公司 | CO 2 trans-critical heat pump device |
| CN107202447A (en) * | 2017-06-27 | 2017-09-26 | 杭州佳力斯韦姆新能源科技有限公司 | A kind of carbon dioxide air source heat pump system for avoiding compressor from returning liquid impact |
| CN108007007A (en) * | 2017-10-30 | 2018-05-08 | 新奥泛能网络科技股份有限公司 | Heat pump system |
| CN211695487U (en) * | 2019-12-25 | 2020-10-16 | 百尔制冷(无锡)有限公司 | Oil return device of liquid supply refrigeration system of transcritical carbon dioxide pump |
-
2019
- 2019-12-25 CN CN201911356862.7A patent/CN111306826A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000046420A (en) * | 1998-07-31 | 2000-02-18 | Zexel Corp | Refrigeration cycle |
| CN101893343A (en) * | 2010-06-24 | 2010-11-24 | 中国科学院理化技术研究所 | Multi-element mixed working medium throttling refrigerator with deeply separated refrigerant and lubricating oil |
| CN203893503U (en) * | 2014-05-15 | 2014-10-22 | 济南神华制冷设备有限公司 | Barrel pump unit forced oil return device |
| CN205580037U (en) * | 2016-04-14 | 2016-09-14 | 福建欣隆环保有限公司 | Supercritical carbon dioxide heat pump return oil system is striden to industrial, commercial MW level |
| CN106918160A (en) * | 2017-04-20 | 2017-07-04 | 郑州云宇新能源技术有限公司 | CO 2 trans-critical heat pump device |
| CN107202447A (en) * | 2017-06-27 | 2017-09-26 | 杭州佳力斯韦姆新能源科技有限公司 | A kind of carbon dioxide air source heat pump system for avoiding compressor from returning liquid impact |
| CN108007007A (en) * | 2017-10-30 | 2018-05-08 | 新奥泛能网络科技股份有限公司 | Heat pump system |
| CN211695487U (en) * | 2019-12-25 | 2020-10-16 | 百尔制冷(无锡)有限公司 | Oil return device of liquid supply refrigeration system of transcritical carbon dioxide pump |
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