CN114754513A - Ejector type grading refrigeration cycle system and method for hydrogen liquefaction - Google Patents
Ejector type grading refrigeration cycle system and method for hydrogen liquefaction Download PDFInfo
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- CN114754513A CN114754513A CN202210450785.7A CN202210450785A CN114754513A CN 114754513 A CN114754513 A CN 114754513A CN 202210450785 A CN202210450785 A CN 202210450785A CN 114754513 A CN114754513 A CN 114754513A
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- ejector
- temperature evaporator
- heat exchanger
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- 238000005057 refrigeration Methods 0.000 title claims abstract description 27
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 21
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 20
- 239000001257 hydrogen Substances 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title description 7
- 230000001172 regenerating effect Effects 0.000 claims abstract description 26
- 239000007788 liquid Substances 0.000 claims abstract description 21
- 239000012530 fluid Substances 0.000 claims abstract description 7
- 238000002347 injection Methods 0.000 claims abstract description 5
- 239000007924 injection Substances 0.000 claims abstract description 5
- 238000001816 cooling Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 2
- 239000003507 refrigerant Substances 0.000 description 12
- 229910052799 carbon Inorganic materials 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 238000004146 energy storage Methods 0.000 description 4
- 238000003860 storage Methods 0.000 description 4
- 230000006978 adaptation Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000001603 reducing effect Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
- 230000003245 working effect 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
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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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
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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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
- F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
- F28D21/0001—Recuperative heat exchangers
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Separation By Low-Temperature Treatments (AREA)
Abstract
The invention discloses an ejector type grading refrigeration cycle system for hydrogen liquefaction, which mainly comprises a compressor, a condenser, a regenerative heat exchanger, an expansion valve, a three-way control valve, a liquid level indicator, a medium temperature evaporator, a low temperature evaporator, an ejector and the like. The outlet of the compressor is connected with the inlet of the condenser, the outlet of the condenser is input into the high-pressure inlet of the ejector after heat exchange with the output of the medium-temperature evaporator through the regenerative heat exchanger, then the outlet of the condenser is divided into two parts through the three-way control valve, one part of the outlet of the condenser passes through the medium-temperature evaporator and then returns to the inlet of the compressor through the heat exchange of the regenerator, the other part of the outlet of the condenser passes through the expansion valve and the liquid observing device and then passes through the low-temperature evaporator and then returns to the low-pressure injection inlet of the ejector, and the pressure energy of the high-pressure inlet fluid is recovered by utilizing the injection effect of the ejector, so that the two-stage cooling of the hydrogen is realized.
Description
Technical Field
The invention belongs to the field of novel energy storage and refrigeration technology application, and particularly relates to an ejector type grading refrigeration cycle system and method for hydrogen liquefaction.
Background
In recent years, the threat of global warming to the natural environment is increasing, and a series of serious disasters are caused. The excessive dependence on traditional energy sources causes frequent occurrence of international energy crisis, and researches on optimization of energy structures, novel energy storage, energy conservation and consumption reduction of traditional industries and the like gradually become a focus. Under the large background of realizing the carbon peak reaching and carbon neutralization targets, the method has important strategic significance for accelerating the construction of a clean low-carbon safe and efficient energy system, strengthening important scientific and technological attack of green low carbon and popularization and application. The hydrogen energy is used as a clean secondary energy with the most development potential in the 21 st century, has the advantages of high combustion heat value, no pollution of products, zero carbon emission, rich raw material reserves and the like, and the research on the preparation, storage, transportation and application of hydrogen becomes the focus of much attention. The liquefied hydrogen storage is a method for converting normal-temperature hydrogen into liquid for storage and transportation by cooling to deep cooling, has the advantages of high energy density, small specific volume, high transportation efficiency, normal-pressure storage and the like, and the conventional common methods for industrial production comprise a linde-hanpton cycle, a claude cycle, a Kapikaiche cycle and the like, are large in scale and complex in structure, and have certain limitations. For the demand of medium and small scale liquid hydrogen preparation of distributed energy storage, how to improve the working effect of graded refrigeration needs to be considered, the energy efficiency characteristic is optimized, and simple and efficient equipment is adopted to reduce energy loss.
Disclosure of Invention
The invention aims to meet the requirements of small and medium-scale distributed liquefied energy storage, and provides an ejector type grading refrigeration cycle system for hydrogen liquefaction. Compared with the traditional refrigeration system, the invention realizes refrigeration of different temperature areas by combining the ejector and the expansion valve, can cool hydrogen gas in different temperature areas step by step, recovers pressure energy in a refrigerant by using the ejector, simplifies the equipment structure, improves the control flexibility of refrigeration temperature, and has an optimization effect on the energy consumption level of the system.
In order to realize the purpose, the invention adopts the following technical scheme:
an ejector type grading refrigeration cycle system for hydrogen liquefaction is characterized by comprising a compressor (1), a condenser (2), a regenerative heat exchanger (3), an ejector (4), a three-way control valve (5), an expansion valve (6), a liquid observing device (7), a medium temperature evaporator (8) and a low temperature evaporator (9), wherein a first-stage refrigeration cycle and a second-stage refrigeration cycle are formed and used for sequentially cooling hydrogen;
the first stage refrigeration cycle is formed by connecting a compressor (1), a condenser (2), a regenerative heat exchanger (3), an ejector (4), a three-way control valve (5) and a medium temperature evaporator (8) in sequence, the outlet of the compressor (1) is connected with the inlet of the condenser (2), the outlet of the condenser (2) is connected with the hot end inlet of the regenerative heat exchanger (3), the cold end outlet of the intermediate temperature evaporator (8) is connected with the cold end inlet of the regenerative heat exchanger (3), cold end and hot end working media exchange heat in the regenerative heat exchanger (3), the hot end outlet of the regenerative heat exchanger (3) is connected with the high pressure inlet of the ejector (4), the cold end outlet of the regenerative heat exchanger (3) is connected with the inlet of the compressor (1), the outlet of the ejector (4) is connected with the inlet of the three-way control valve (5), and the left outlet of the three-way control valve (5) is connected with the cold end inlet of the intermediate temperature evaporator (8);
The second-stage refrigeration cycle is formed by sequentially connecting an ejector (4), a three-way control valve (5), an expansion valve (6), a liquid observing device (7) and a low-temperature evaporator (9), a right-side outlet of the three-way control valve (5) is connected with an inlet of the expansion valve (6), an outlet of the expansion valve (6) is connected with an inlet of the liquid observing device (7), an outlet of the liquid observing device (7) is connected with a cold-end inlet of the low-temperature evaporator (9), and a cold-end outlet of the low-temperature evaporator (9) is connected with a low-pressure injection inlet of the ejector (4).
In the ejector type grading refrigeration cycle system for hydrogen liquefaction, the ejector is provided with 3 connecting ports including a high-pressure inlet, a low-pressure inlet and a medium-pressure outlet, and fluid entering from the high-pressure inlet ejects and mixes fluid at the low-pressure inlet and flows out from the medium-pressure outlet together.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic diagram of an ejector-type staged refrigeration cycle system for hydrogen liquefaction according to the present invention;
reference numerals are as follows:
the method comprises the following steps of 1-a compressor, 2-a condenser, 3-a regenerative heat exchanger, 4-an ejector, 5-a three-way control valve, 6-an expansion valve, 7-a liquid level indicator, 8-a medium temperature evaporator and 9-a low temperature evaporator.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The system consists of a compressor (1), a condenser (2), a regenerative heat exchanger (3), an ejector (4), a three-way control valve (5), an expansion valve (6), a liquid sight device (7), a medium temperature evaporator (8) and a low temperature evaporator (9), and a first-stage refrigeration cycle and a second-stage refrigeration cycle are formed to cool hydrogen in sequence;
the first stage refrigeration cycle is formed by connecting a compressor (1), a condenser (2), a regenerative heat exchanger (3), an ejector (4), a three-way control valve (5) and a medium temperature evaporator (8) in sequence, the outlet of the compressor (1) is connected with the inlet of the condenser (2), the outlet of the condenser (2) is connected with the hot end inlet of the regenerative heat exchanger (3), the cold end outlet of the intermediate temperature evaporator (8) is connected with the cold end inlet of the regenerative heat exchanger (3), cold end and hot end working media exchange heat in the regenerative heat exchanger (3), the hot end outlet of the regenerative heat exchanger (3) is connected with the high pressure inlet of the ejector (4), the cold end outlet of the regenerative heat exchanger (3) is connected with the inlet of the compressor (1), the outlet of the ejector (4) is connected with the inlet of the three-way control valve (5), and the left outlet of the three-way control valve (5) is connected with the cold end inlet of the intermediate temperature evaporator (8);
The second stage refrigeration cycle is formed by sequentially connecting an ejector (4), a three-way control valve (5), an expansion valve (6), a liquid observing device (7) and a low-temperature evaporator (9), an outlet on the right side of the three-way control valve (5) is connected with an inlet of the expansion valve (6), an outlet of the expansion valve (6) is connected with an inlet of the liquid observing device (7), an outlet of the liquid observing device (7) is connected with a cold end inlet of the low-temperature evaporator (9), and a cold end outlet of the low-temperature evaporator (9) is connected with a low-pressure injection inlet of the ejector (4).
When the system operates, the gaseous refrigerant is compressed by the compressor (1) and then becomes a high-temperature high-pressure state, is primarily cooled by the condenser (2), then enters the regenerative heat exchanger (3) and is further subjected to heat exchange and cooling with the low-temperature refrigerant output from the medium-temperature evaporator (8). The cooled high-pressure refrigerant enters the ejector (4), and the temperature of the refrigerant is remarkably reduced by utilizing the pressure and speed reducing effects of the ejector. Then, the refrigerant is divided into two paths through a three-way control valve (5), one path is output from the left side, the input hydrogen to be cooled is subjected to first-stage cooling through a medium-temperature heat exchanger (8), and the refrigerant is output by the medium-temperature heat exchanger (8), absorbs heat through a regenerative heat exchanger (3) and then returns to the compressor (1); the other path of the refrigerant enters a gas-liquid two-phase mixed state through the expansion valve (6) for throttling expansion again to reach lower temperature and lower pressure, the refrigerant enters a gas-liquid two-phase mixed state at the moment, the liquid receiver (7) is used for observing the liquid containing condition in a refrigerant channel, the branch further exchanges heat with the cooled fluid output by the medium-temperature evaporator (8) in the low-temperature evaporator (9) to cool the cooled fluid to the lower temperature, the refrigerant enters the low-pressure inlet end of the ejector (4) after being output by the low-temperature evaporator (9), and is ejected by the high-pressure refrigerant output by the regenerative heat exchanger (3) and then mixed and output, so that one-time complete working cycle is realized.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, many modifications and adaptations can be made without departing from the principle of the present invention, and such modifications and adaptations should also be considered as the scope of the present invention.
Claims (2)
1. An ejector type grading refrigeration cycle system for hydrogen liquefaction is characterized by comprising a compressor (1), a condenser (2), a backheating heat exchanger (3), an ejector (4), a three-way control valve (5), an expansion valve (6), a liquid observing device (7), a medium temperature evaporator (8) and a low temperature evaporator (9) to form a first stage refrigeration cycle and a second stage refrigeration cycle, and hydrogen is sequentially cooled by the medium temperature evaporator and the low temperature evaporator;
the first stage refrigeration cycle is formed by connecting a compressor (1), a condenser (2), a regenerative heat exchanger (3), an ejector (4), a three-way control valve (5) and a medium temperature evaporator (8) in sequence, the outlet of the compressor (1) is connected with the inlet of the condenser (2), the outlet of the condenser (2) is connected with the hot end inlet of the regenerative heat exchanger (3), the cold end outlet of the intermediate temperature evaporator (8) is connected with the cold end inlet of the regenerative heat exchanger (3), cold end and hot end working media exchange heat in the regenerative heat exchanger (3), the hot end outlet of the regenerative heat exchanger (3) is connected with the high pressure inlet of the ejector (4), the cold end outlet of the regenerative heat exchanger (3) is connected with the inlet of the compressor (1), the outlet of the ejector (4) is connected with the inlet of the three-way control valve (5), and the left outlet of the three-way control valve (5) is connected with the cold end inlet of the intermediate temperature evaporator (8);
The second-stage refrigeration cycle is formed by sequentially connecting an ejector (4), a three-way control valve (5), an expansion valve (6), a liquid observing device (7) and a low-temperature evaporator (9), an outlet on the right side of the three-way control valve (5) is connected with an inlet of the expansion valve (6), an outlet of the expansion valve (6) is connected with an inlet of the liquid observing device (7), an outlet of the liquid observing device (7) is connected with a cold end inlet of the low-temperature evaporator (9), and a cold end outlet of the low-temperature evaporator (9) is connected with a low-pressure injection inlet of the ejector (4).
2. An ejector-type staged refrigeration cycle system for the liquefaction of hydrogen as claimed in claim 1 wherein said ejector has 3 ports of a high pressure inlet, a low pressure inlet and a medium pressure outlet, and fluid entering from the high pressure inlet ejects and mixes fluid at the low pressure inlet and flows out from the medium pressure outlet together.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210450785.7A CN114754513A (en) | 2022-04-26 | 2022-04-26 | Ejector type grading refrigeration cycle system and method for hydrogen liquefaction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210450785.7A CN114754513A (en) | 2022-04-26 | 2022-04-26 | Ejector type grading refrigeration cycle system and method for hydrogen liquefaction |
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| Publication Number | Publication Date |
|---|---|
| CN114754513A true CN114754513A (en) | 2022-07-15 |
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| CN202210450785.7A Pending CN114754513A (en) | 2022-04-26 | 2022-04-26 | Ejector type grading refrigeration cycle system and method for hydrogen liquefaction |
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| CN (1) | CN114754513A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1910410A (en) * | 2004-09-22 | 2007-02-07 | 株式会社电装 | Ejector type refrigeration cycle |
| JP2007078340A (en) * | 2005-08-17 | 2007-03-29 | Denso Corp | Ejector type refrigerating cycle |
| CN109073291A (en) * | 2016-03-25 | 2018-12-21 | 法雷奥热系统公司 | Air conditioner of motor vehicle circuit |
| CN111692771A (en) * | 2019-03-15 | 2020-09-22 | 开利公司 | Ejector and refrigeration system |
| CN113251681A (en) * | 2020-02-10 | 2021-08-13 | 开利公司 | Refrigeration system with a plurality of heat absorption heat exchangers |
-
2022
- 2022-04-26 CN CN202210450785.7A patent/CN114754513A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1910410A (en) * | 2004-09-22 | 2007-02-07 | 株式会社电装 | Ejector type refrigeration cycle |
| JP2007078340A (en) * | 2005-08-17 | 2007-03-29 | Denso Corp | Ejector type refrigerating cycle |
| CN109073291A (en) * | 2016-03-25 | 2018-12-21 | 法雷奥热系统公司 | Air conditioner of motor vehicle circuit |
| CN111692771A (en) * | 2019-03-15 | 2020-09-22 | 开利公司 | Ejector and refrigeration system |
| CN113251681A (en) * | 2020-02-10 | 2021-08-13 | 开利公司 | Refrigeration system with a plurality of heat absorption heat exchangers |
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