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Hydrogen liquefaction process

A process, liquid nitrogen technology, applied in the field of hydrogen liquefaction process, can solve the problems of small latent heat of vaporization, low hydrogen critical temperature and conversion temperature, difficulty in producing liquid hydrogen, etc., and achieve the effect of avoiding waste and saving energy

Active Publication Date: 2011-06-01
ALLY HI TECH CO LTD
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  • Description
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Problems solved by technology

[0005] However, due to the low critical temperature and conversion temperature of hydrogen, the latent heat of vaporization is small, and its theoretical minimum liquefaction work is the highest among all gases, so it is difficult to produce liquid hydrogen

Method used

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Embodiment Construction

[0028] All features disclosed in this specification, or steps in all methods or processes disclosed, may be combined in any manner, except for mutually exclusive features and / or steps.

[0029] Any feature disclosed in this specification, unless specifically stated, can be replaced by other alternative features that are equivalent or have similar purposes. That is, unless expressly stated otherwise, each feature is one example only of a series of equivalent or similar features.

[0030] Such as figure 1 As shown, a hydrogen liquefaction process includes a nitrogen refrigeration cycle, a helium refrigeration cycle and a hydrogen refrigeration cycle;

[0031] The nitrogen refrigeration cycle includes the following steps: a) generating liquid nitrogen from air through an air separation device; b) inputting the generated liquid nitrogen into the second heat exchanger in the cold box, the second heat exchanger is It becomes a liquid nitrogen tank, and the liquid nitrogen evaporat...

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Abstract

The invention discloses a hydrogen liquefaction process comprising a nitrogen refrigeration cycle, a helium refrigeration cycle and a hydrogen refrigeration cycle. In the technical scheme, liquid helium generated by a liquid helium and air separating device is used as a refrigeration working medium, refrigerating capacity required by hydrogen condensation and liquefaction is provided by the liquid helium, rewarmed helium gas and nitrogen gas are respectively recycled and can be turned into the liquid helium and liquid nitrogen after being processed correspondingly when the refrigerating capacity is provided for the hydrogen liquefaction by the liquid helium and the liquid nitrogen, thus the continuous refrigerating capacity is provided for the hydrogen refrigeration cycle by the helium refrigeration cycle and the nitrogen refrigeration cycle, waste caused by directly discharging the helium gas or the nitrogen gas is avoided, and energy sources are saved. In the intention, operation that any one of the three refrigeration cycles is independent of the other two refrigeration cycles is realized, and heat quantity exchange is carried out among the three refrigeration cycles, thus liquid hydrogen generation is finally completed, and the liquefaction of hydrogen gas is realized by sequentially utilizing the refrigerating capacity of the liquid helium and the liquid nitrogen in the hydrogen refrigeration cycle.

Description

technical field [0001] The invention relates to a hydrogen liquefaction process. Background technique [0002] Liquid hydrogen is a colorless, transparent low-temperature liquid with a normal boiling point of 20.38K and a density of about 1 / 14 of that of water. 1m 3 The gasification of all liquid hydrogen can produce 788Nm 3 gas hydrogen. Liquid hydrogen is an excellent rocket propellant, but also an excellent refrigerant, which is necessary for low-temperature cables, some superconducting components, infrared detectors, and low-temperature physics experiments; in addition, in refining pure semiconductor materials In industrial sectors such as medicine processing and food processing, liquid hydrogen can be used as the gas source of ultra-pure hydrogen; in the research of high-energy physics to detect elementary particles, the bubble chamber filled with liquid hydrogen is an advanced scientific experimental device. Hydrogen is an ideal clean energy, which releases a lot of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25J1/02
CPCF25J1/001F25J1/005F25J1/0052F25J1/0065F25J1/0072F25J1/0205F25J1/0234
Inventor 王业勤陈志国杜雯雯
Owner ALLY HI TECH CO LTD
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