CN110411060B - A liquid nitrogen decompression cryogenic cooling system - Google Patents
A liquid nitrogen decompression cryogenic cooling system Download PDFInfo
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- CN110411060B CN110411060B CN201910669664.XA CN201910669664A CN110411060B CN 110411060 B CN110411060 B CN 110411060B CN 201910669664 A CN201910669664 A CN 201910669664A CN 110411060 B CN110411060 B CN 110411060B
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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
- F25B19/00—Machines, plants or systems, using evaporation of a refrigerant but without recovery of the vapour
- F25B19/005—Machines, plants or systems, using evaporation of a refrigerant but without recovery of the vapour the refrigerant being a liquefied gas
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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
- F25B19/00—Machines, plants or systems, using evaporation of a refrigerant but without recovery of the vapour
- F25B19/02—Machines, plants or systems, using evaporation of a refrigerant but without recovery of the vapour using fluid jet, e.g. of steam
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Abstract
The invention discloses a liquid nitrogen decompression low-temperature cooling system, which relates to the technical field of low temperature and comprises a negative pressure liquid nitrogen storage tank, a normal pressure liquid nitrogen storage tank, a centrifugal compressor unit and a heat exchanger; the centrifugal compressor unit comprises a centrifugal compressor, a heat exchanger is arranged at a gas inlet of the centrifugal compressor unit, and a gas outlet of the negative pressure liquid nitrogen storage tank is communicated with a gas inlet of a first stage of the centrifugal compressor unit through the heat exchanger; the gas temperature at the low-temperature gas outlet of the heat exchanger is higher than that at the inlet of the heat exchanger; the refrigerating system also comprises a gas ejector, and a first inlet of the gas ejector is communicated with the last stage of the centrifugal compressor unit; the normal pressure liquid nitrogen storage tank is communicated with the second inlet of the gas ejector after passing through the heat exchanger; the gas flow through the first inlet is directed by the pressure difference out of the atmospheric liquid nitrogen storage tank and into the air. The invention effectively obtains low-temperature liquid nitrogen in a negative pressure state, simultaneously controls the air pillow pressure of the normal-pressure liquid nitrogen storage tank, and improves the performance of the system by utilizing the heat and the pressure generated by the compressor.
Description
Technical Field
The invention relates to the technical field of low temperature, in particular to a liquid nitrogen decompression low-temperature cooling system.
Background
The cold energy of the low-temperature liquid is a good cold source, such as liquid oxygen, liquid nitrogen, liquid hydrogen, liquid methane and the like, and particularly the liquid nitrogen is used as a cooling working medium and is low in price and safe. However, under atmospheric pressure, the evaporation temperature of liquid nitrogen is 77K, which is relatively high, and cannot meet the cooling requirements of some working conditions. In order to obtain lower temperatures, subcooled liquid nitrogen cooling systems are widely used at home and abroad.
The supercooling liquid nitrogen cooling system is divided into two types according to the difference of cold sources: the first one is a closed super-cooling liquid nitrogen cooling system using a small low-temperature refrigerator as a cold source; the other is refrigeration by low-temperature liquid nitrogen low-pressure gasification, which is generally an open or semi-open type circulation mode. The closed type supercooling liquid nitrogen cooling system using the small low-temperature refrigerator as a cold source does not need to consume liquid nitrogen, runs stably and reliably, but has the defects of large system, complex operation, need of a low-temperature heat transfer structure with reasonable design and high price of the refrigerator. The low-temperature liquid nitrogen gasification refrigeration system has low energy consumption in field operation, relatively compact and movable equipment and wide application.
In a low-temperature liquid nitrogen gasification refrigeration system, in order to reduce the gasification temperature of low-temperature liquid nitrogen, a decompression evacuation system is required to reduce the pressure of an air pillow in a liquid nitrogen container to negative pressure, when the saturated vapor pressure of the liquid nitrogen is reduced to 0.018MPa, the saturated temperature of the liquid nitrogen can be reduced to 65K, and the effect of decompression and temperature reduction is obvious. In the past design research, the vacuum pumping system uses a vacuum pump to continuously pump out low-temperature gas, so that low-temperature liquid is continuously evaporated and self heat is taken away to obtain low temperature. However, the conventional vacuum pump cannot achieve a large flow rate, and under the condition of large cooling capacity, other devices are required to achieve the effect of pressure reduction and evacuation. In an X33 liquid oxygen supercooling system of NASA, a three-stage series centrifugal compressor is used as a decompression and evacuation system to directly pump low-temperature nitrogen generated in a liquid nitrogen heat exchanger for cooling liquid oxygen to obtain low-temperature and low-pressure liquid nitrogen.
The cooling liquid nitrogen system of the centrifugal compressor unit for directly pumping low-temperature gas has the following problems:
(1) the centrifugal compressor is divided into a normal-temperature working part and a low-temperature working part on the whole structure, the centrifugal compressor comprises a driving device, namely a three-phase asynchronous motor, a bearing, a variable-frequency controller and the like, at normal temperature, and comprises a gas circulation part consisting of a cold press impeller, an outlet blade diffuser and a volute at low temperature, so that the problems of complex structure, difficult maintenance and the like of the centrifugal cold compressor need to be solved on the whole structure; (2) the first-stage inlet of the centrifugal cold compressor set is at the lowest temperature and lowest pressure point of the whole system, which has a bad influence on the operation of the centrifugal cold compressor set, and the low temperature causes the local low sonic speed of the airflow, easily causes the sonic speed or supersonic speed movement of the airflow, and causes the performance of the whole compressor to be sharply reduced; (3) if only low-temperature liquid nitrogen is used for directly cooling working media with higher temperature, the heat exchange temperature difference is possibly overlarge, and the boiling curve of the liquid nitrogen is analyzed to find that when the superheat degree exceeds 30K, film boiling is possible to occur, and the heat transfer working condition is deteriorated.
Therefore, the technical personnel in the field are dedicated to developing a liquid nitrogen decompression low-temperature cooling system, the liquid nitrogen decompression low-temperature cooling system has a compact structure, the working medium at the inlet of the compressor is preheated, and the heat exchange efficiency is high. The invention improves the prior art, improves the inlet temperature of the first stage of the centrifugal compressor unit by adding the heat recovery system, simultaneously adds the gas ejector, and ejects the gas-phase nitrogen evaporated in the normal-pressure liquid nitrogen storage tank by utilizing the residual pressure of the compressor, so that the system effectively obtains the low-temperature liquid nitrogen in a negative pressure state, simultaneously controls the air pillow pressure of the normal-pressure liquid nitrogen storage tank, takes into account the heat and the pressure generated by the compressor, and improves the performance of the whole liquid nitrogen supercooling system.
Disclosure of Invention
In view of the above defects in the prior art, the technical problem to be solved by the present invention is to avoid the first stage temperature of the compressor being too low, and to avoid film boiling caused by too large heat exchange temperature difference.
In order to achieve the aim, the invention provides a liquid nitrogen reduced-pressure low-temperature cooling system which comprises a negative-pressure liquid nitrogen storage tank, a normal-pressure liquid nitrogen storage tank, a centrifugal compressor unit, a first heat exchanger and a second heat exchanger, wherein the negative-pressure liquid nitrogen storage tank is connected with the first heat exchanger; the centrifugal compressor unit comprises a first centrifugal compressor, a second centrifugal compressor and a third centrifugal compressor which are sequentially communicated; the gas of the negative pressure liquid nitrogen storage tank enters the first centrifugal compressor through the first heat exchanger; the gas of the first centrifugal compressor enters the second centrifugal compressor through the second heat exchanger; and the gas of the second centrifugal compressor enters the third centrifugal compressor through the first heat exchanger.
Further, the gas temperature at the low-temperature gas outlet of the heat exchanger is higher than the gas temperature at the low-temperature gas inlet thereof.
Further, the refrigeration system is characterized by further comprising a gas ejector; a gas outlet of the third centrifugal compressor is communicated with the first inlet of the gas ejector; and a gas outlet of the normal-pressure liquid nitrogen storage tank is communicated with a second inlet of the gas ejector through the second heat exchanger.
Further, the gas flow through the first inlet port utilizes the pressure difference to inject the gas in the atmospheric liquid nitrogen storage tank and discharge the gas to the air.
Further, the gas ejector comprises a nozzle, a suction chamber, a mixing chamber and a diffuser; the first inlet is arranged on the nozzle, the second inlet is arranged on the suction chamber, and the injection airflow and the injected airflow are mixed in the mixing chamber and are discharged after being pressurized by the diffuser.
Further, the first heat exchanger and the second heat exchanger have two gas passages.
Further, one of the two gas passages is used for passing the heating gas; and the other for passing the heated gas.
Further, the gas flowing out of the normal pressure liquid nitrogen storage tank is the heated gas; the gas flowing out of the low-temperature liquid nitrogen storage tank is the heated gas; the gas flows through the gas channel for the heated gas in the centrifugal compressor.
Further, the pressure ratio of the centrifugal compressor ranges from 7 to 12.
Further, the heat exchanger is a plate heat exchanger, a double-pipe heat exchanger or a heat pipe heat exchanger.
In a preferred embodiment of the invention, the pressure ratio of the centrifugal compressor unit is influenced by the centrifugal compressor rotational speed and the gas flow rate; the size of the centrifugal compressor unit is influenced by the size of the cold energy required by the liquid nitrogen storage tank and objects cooled by the liquid nitrogen; the size of the gas pipeline is also influenced by the size of the cold quantity required by the liquid nitrogen storage tank and objects cooled by the liquid nitrogen; the size of the gas ejector is influenced by the temperature, pressure and flow of the ejector gas flow and the ejected gas flow.
According to the invention, a heat return pipeline and a gas ejector are added in the traditional decompression and evacuation system which utilizes a centrifugal compressor unit as low-temperature liquid cooling, so that on one hand, the inlet temperature of the first-stage centrifugal compressor unit can be obviously improved, the risk that the operation condition of the centrifugal compressor is deteriorated due to the extremely low inlet temperature is reduced, and the efficiency of the centrifugal compressor is favorably improved; on the other hand, the gas ejector utilizes the residual pressure of the compressor unit, can eject the gas-phase nitrogen in the normal-pressure liquid nitrogen storage tank and is used for stabilizing the pressure of the gas pillow in the normal-pressure liquid nitrogen storage tank.
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.
Drawings
FIG. 1 is a schematic structural diagram of a preferred embodiment of the present invention;
fig. 2 is a schematic structural diagram of another preferred embodiment of the present invention.
The system comprises a 1-negative pressure liquid nitrogen storage tank, a 2-first heat exchanger, a 3-first centrifugal compressor, a 4-second heat exchanger, a 5-second centrifugal compressor, a 6-third centrifugal compressor, a 7-gas ejector, an 8-normal pressure liquid nitrogen storage tank, a 9-liquid oxygen pump and a 10-liquid oxygen storage tank.
Detailed Description
A preferred embodiment of the present invention will be described below with reference to the accompanying drawings for clarity and understanding of the technical contents thereof. The present invention may be embodied in many different forms of embodiments and the scope of the invention is not limited to the embodiments set forth herein.
In the drawings, structurally identical elements are represented by like reference numerals, and structurally or functionally similar elements are represented by like reference numerals throughout the several views. The size and thickness of each component shown in the drawings are arbitrarily illustrated, and the present invention is not limited to the size and thickness of each component. The thickness of the components may be exaggerated where appropriate in the figures to improve clarity.
As shown in figure 1, the liquid nitrogen reduced-pressure low-temperature cooling system provided by the invention comprises a centrifugal compressor, a negative-pressure liquid nitrogen storage tank 1, a normal-pressure liquid nitrogen storage tank 8 and a heat exchanger. The liquid nitrogen forms a gas phase, a gas-liquid interface and a liquid phase in the negative pressure liquid nitrogen storage tank 1 and the normal pressure liquid nitrogen storage tank 8. The gas-phase nitrogen gas moves towards the outlet under the action of the centrifugal compressor, and the liquid nitrogen is gasified to absorb heat due to the reduction of the gas-phase pressure, so that the temperature of the liquid nitrogen is reduced.
The heat exchanger is arranged at the gas inlet of the centrifugal compressor, so that the temperature of the gas-phase nitrogen is increased after the gas-phase nitrogen passes through the heat exchanger, and then the gas-phase nitrogen enters the centrifugal compressor. The arrangement obviously improves the inlet temperature of the centrifugal compressor, reduces the risk that the operation condition of the centrifugal compressor is deteriorated due to the extremely low inlet temperature, and is favorable for improving the efficiency of the centrifugal compressor. It is to be noted that, when a centrifugal compressor group composed of a plurality of centrifugal compressors is present in the system, it is not limited to providing a heat exchanger at the gas inlet of the centrifugal compressor of the first stage, and a heat exchanger may be provided at the gas inlet of each centrifugal compressor. Meanwhile, in order to save cost and further improve the system integration level, the heat exchanger can adopt a multi-channel structure, a plurality of gas circuits are communicated through pipelines, the number of the heat exchanger is reduced, and the temperature of gas flowing into a plurality of centrifugal compressors can be increased through the heat exchanger.
In the prior art, nitrogen generated in the normal pressure liquid nitrogen storage tank 8 needs to be discharged out of the storage tank in time in an opening or exhaust port mode, if the opening is used, the normal pressure liquid nitrogen storage tank 8 is cooled, the heat load is large, and the liquid nitrogen consumption is large; if the exhaust port is adopted, certain resistance needs to be overcome when nitrogen passes through the exhaust port, so that the pressure in the normal-pressure liquid nitrogen storage tank 8 is higher than the actual atmospheric pressure, and the heat exchange efficiency is reduced. The invention adds a gas ejector 7 in a liquid nitrogen decompression low-temperature cooling system. The gas ejector 7 is provided with two inlets, one inlet is communicated with a gas outlet of the last stage of the multistage centrifugal compressor unit, and the other inlet is communicated with a gas outlet of the normal pressure liquid nitrogen storage tank 8. When gas of the multistage centrifugal compressor unit enters the gas ejector 7, the structure of the first inlet is designed, so that the passing gas generates high-speed turbulent jet flow, namely, jet airflow; the jet air flow can form a low-pressure area and jet surrounding gas to form jet air flow, so that the gas in the normal-pressure liquid nitrogen storage tank 8 can form jet air flow, enter the gas ejector 7 and are mixed with the jet air flow; the total mass of the mixed flowing gas is increased, and then the mixed flowing gas is pressurized and discharged into the air. By introducing the gas ejector 7, the heat load can be reduced, the pressure of the normal-pressure liquid nitrogen storage tank 8 is maintained, and the heat exchange efficiency is improved.
The concept of the present invention will be described in detail by way of a preferred embodiment 1 of the present invention.
Example 1
As shown in fig. 1, the liquid nitrogen reduced-pressure cryogenic cooling system provided by this embodiment includes a negative-pressure liquid nitrogen storage tank 1, a first heat exchanger 2, a first centrifugal compressor 3, a second heat exchanger 4, a second centrifugal compressor 5, a third centrifugal compressor 6, a gas ejector 7, a normal-pressure liquid nitrogen storage tank 8, and pipelines, and all the components are connected through the pipelines to form a gas path.
The first centrifugal compressor 3, the second centrifugal compressor 5 and the third centrifugal compressor 6 respectively constitute a first stage, a second stage and a third stage of the centrifugal compressor set.
The first heat exchanger 2 and the second heat exchanger 4 both adopt a multi-channel structure, a gas outlet of the negative pressure liquid nitrogen storage tank 1 is communicated with a gas inlet of the first centrifugal compressor 3 through the first heat exchanger 2, and a channel of the first heat exchanger 2 for heated gas is used. The gas outlet of the second centrifugal compressor 5 communicates with the gas inlet of the third centrifugal compressor 6 through the passage for heated gas of the first heat exchanger 2. The gas outlet of the first centrifugal compressor 3 is communicated with the gas inlet of the second centrifugal compressor 5 through the channel for heating gas of the second heat exchanger 4, and the gas outlet of the normal pressure liquid nitrogen storage tank 8 is communicated with the gas ejector 7 through the channel for heated gas of the second heat exchanger 4. By adopting the heat exchanger with a multi-channel structure, the gas flowing into each centrifugal compressor can be ensured to pass through a heat exchange process, and the temperature is increased; but also can reduce the number of heat exchangers and make the system more compact.
The gas injector 7 includes a nozzle, a suction chamber, a mixing chamber and a diffuser (not shown). The nozzle is provided with a first inlet, and the suction chamber is provided with a second inlet. The gas discharged from the third centrifugal compressor 6 enters the gas eductor 7 through the first inlet in the nozzle; gas from the atmospheric liquid nitrogen storage tank 8 enters the gas eductor 7 through a second inlet in the suction chamber. When the gas passes through the nozzle, the gas is sprayed out through the nozzle to generate high-speed turbulent jet, namely jet airflow; the jet air flow forms a low pressure zone and jets the surrounding gas, thereby ejecting the gas from the atmospheric liquid nitrogen storage tank 8 into the suction chamber. The gas flowing in from the nozzle and the gas flowing in from the suction chamber are mixed in the mixing chamber, the total mass of the gas is increased, and the mixed gas is pressurized by the diffuser and then is discharged to the air.
Example 2
This example uses the liquid nitrogen reduced-pressure cryogenic cooling system of example 1 for subcooling atmospheric liquid oxygen.
As shown in FIG. 2, in this embodiment, a liquid oxygen storage tank 10 and a liquid oxygen pump 9 are added to the embodiment 1, and the liquid nitrogen cooled by the present invention is used to supercool the normal pressure liquid oxygen. The normal pressure liquid oxygen in the liquid oxygen storage tank 10 is pumped out from the upper layer of the liquid oxygen storage tank 10 under the action of the liquid oxygen pump 9 at the temperature of 90K. The liquid oxygen passing through the liquid oxygen pump 9 firstly passes through a heat exchanger in a normal pressure liquid nitrogen storage tank 8, the liquid nitrogen pressure of the normal pressure liquid nitrogen storage tank 8 is 0.101MPa, and the temperature is 77K. In the heat exchanger, liquid oxygen flows on the tube side, and liquid nitrogen exchanges heat on the shell side in a phase change manner. The gas-phase nitrogen generated by the phase change of the liquid nitrogen is ejected through the gas ejector 7.
Then the liquid oxygen passes through a heat exchanger in a negative pressure liquid nitrogen storage tank 1, the pressure of the liquid nitrogen in the negative pressure liquid nitrogen storage tank 1 is 0.018MPa, and the temperature is 65K. In the heat exchanger, liquid oxygen flows on the tube side, and liquid nitrogen exchanges heat on the shell side in a phase change manner. The negative pressure (0.018MPa) of the gas-phase nitrogen pillow in the negative-pressure liquid nitrogen storage tank 1 is realized by the liquid nitrogen reduced-pressure cryogenic cooling system. Through comparison calculation, when the capacity of the liquid oxygen storage tank 10 is 2m3And the temperature of the gas-phase nitrogen at the inlet of the first centrifugal compressor 3 is increased to 100K within two hours from the initial temperature of 90K to 70K, which is 34K higher than the inlet temperature of 66K at the first stage of the centrifugal compressor unit without the regenerative system, and the effect is obvious. Meanwhile, if the gas ejector 7 is not provided, the gas-phase nitrogen generated in the normal-pressure liquid nitrogen storage tank 8 needs to be discharged in time in an open or discharge mode. If it isThe heat load of the heat exchanger in the normal-pressure liquid nitrogen storage tank 8 is very large due to the use of the opening, so that the consumption of liquid nitrogen is very large; if the discharge port is adopted, the gas-phase nitrogen needs to overcome certain resistance when passing through the discharge port, so that the pressure of the heat exchanger is higher than the actual atmospheric pressure, and the efficiency of the heat exchanger is reduced. The gas ejector 7 is adopted, so that the heat load can be reduced, and the pressure of the heat exchanger in the normal-pressure liquid nitrogen storage tank 8 is maintained. If the pressure ratio of the centrifugal compressor unit is higher, the pressure of the heat exchanger in the normal-pressure liquid nitrogen storage tank 8 is possibly lower than the actual atmospheric pressure, and the efficiency of the heat exchanger is improved.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (8)
1. A liquid nitrogen decompression low-temperature cooling system is characterized by comprising a negative pressure liquid nitrogen storage tank, a normal pressure liquid nitrogen storage tank, a centrifugal compressor unit, a first heat exchanger and a second heat exchanger; the centrifugal compressor unit comprises a first centrifugal compressor, a second centrifugal compressor and a third centrifugal compressor which are sequentially communicated; the gas of the negative pressure liquid nitrogen storage tank enters the first centrifugal compressor through the first heat exchanger; the gas of the first centrifugal compressor enters the second centrifugal compressor through the second heat exchanger; the gas of the second centrifugal compressor enters the third centrifugal compressor through the first heat exchanger; the cooling system further comprises a gas ejector; a gas outlet of the third centrifugal compressor is communicated with the first inlet of the gas ejector; the gas outlet of the normal-pressure liquid nitrogen storage tank is communicated with the second inlet of the gas ejector through the second heat exchanger; the gas ejector comprises a nozzle, a suction chamber, a mixing chamber and a diffuser; the first inlet is arranged on the nozzle, the second inlet is arranged on the suction chamber, and the injection airflow and the injected airflow are mixed in the mixing chamber and are discharged after being pressurized by the diffuser.
2. The cooling system of claim 1, wherein the gas temperature at the low temperature gas outlet of the heat exchanger is higher than the gas temperature at the low temperature gas inlet thereof.
3. The cooling system of claim 1, wherein the gas flow through the first inlet uses a pressure differential to draw gas from the atmospheric liquid nitrogen storage tank and out to the atmosphere.
4. The cooling system of claim 1, wherein the first heat exchanger and the second heat exchanger have two gas passages.
5. The cooling system of claim 4, wherein one of the two gas passages is used to pass a heated gas; and the other for passing the heated gas.
6. The cooling system of claim 5, wherein the gas flowing from said atmospheric liquid nitrogen storage tank is said heated gas; the gas flowing out of the low-temperature liquid nitrogen storage tank is the heated gas; the gas flows through the gas channel for the heated gas in the centrifugal compressor.
7. The cooling system of claim 1, wherein the centrifugal compressor has a pressure ratio in the range of 7-12.
8. The cooling system according to any one of claims 1 to 7, wherein the heat exchanger is a plate heat exchanger, a double pipe heat exchanger or a heat pipe heat exchanger.
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Citations (4)
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| US2163054A (en) * | 1937-08-10 | 1939-06-20 | Earl R Andrix | Refrigerating system |
| CN1154463A (en) * | 1994-07-29 | 1997-07-16 | 乔治·克劳德方法的研究开发空气股份有限公司 | Process and installation for production of gaseous oxygen under pressure at variable flow rate |
| EP1033542A2 (en) * | 1999-03-04 | 2000-09-06 | The Boeing Company | Cryogenic liquid heat exchanger system with fluid ejector |
| CN109579351A (en) * | 2018-11-19 | 2019-04-05 | 中国人民解放军战略支援部队航天工程大学 | Big flow liquid oxygen based on Supersonic Ejector crosses cooling method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107314615A (en) * | 2016-06-12 | 2017-11-03 | 中国石油化工股份有限公司 | LNG drops a hint re-liquefied recovery method |
| CN206112504U (en) * | 2016-10-18 | 2017-04-19 | 江苏克劳特低温技术有限公司 | Static evaporation rate of auxiliary gas cylinder of liquid nitrogen detects BOG recovery unit |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2163054A (en) * | 1937-08-10 | 1939-06-20 | Earl R Andrix | Refrigerating system |
| CN1154463A (en) * | 1994-07-29 | 1997-07-16 | 乔治·克劳德方法的研究开发空气股份有限公司 | Process and installation for production of gaseous oxygen under pressure at variable flow rate |
| EP1033542A2 (en) * | 1999-03-04 | 2000-09-06 | The Boeing Company | Cryogenic liquid heat exchanger system with fluid ejector |
| CN109579351A (en) * | 2018-11-19 | 2019-04-05 | 中国人民解放军战略支援部队航天工程大学 | Big flow liquid oxygen based on Supersonic Ejector crosses cooling method |
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