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A device and method for recovering by-product oxygen in hydrogen production from electrolyzed water by using low temperature method

A technology of water electrolysis and low temperature method, applied in the field of hydrogen and oxygen production, can solve the problem of waste of by-product oxygen, and achieve the effects of saving energy, high pressure and reducing reheating

Active Publication Date: 2021-12-24
HANGZHOU HANGYANG
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is: to provide a device and method for recovering by-product oxygen from electrolyzed water by low temperature method, to solve the problem of waste of by-product oxygen in the green electrolyzed water to hydrogen process, and to reduce the overall carbon emission of users at the same time. Realize the purpose of high efficiency and energy saving, in order to realize above-mentioned purpose, the following technology that the present invention adopts:

Method used

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  • A device and method for recovering by-product oxygen in hydrogen production from electrolyzed water by using low temperature method
  • A device and method for recovering by-product oxygen in hydrogen production from electrolyzed water by using low temperature method
  • A device and method for recovering by-product oxygen in hydrogen production from electrolyzed water by using low temperature method

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specific Embodiment

[0034] attached figure 1 Shown is a safe and efficient device that adopts a two-stage pressurized single-expansion process to recover green electrolyzed water to produce hydrogen by-product oxygen by low-temperature method.

[0035] The pressure of the green electrolytic water hydrogen production system is about 1.6MPaG. The by-product oxygen first enters the oxygen purification system. In the oxygen purification system, the oxygen first converts H 2、 Impurities such as CO react into H 2 O and CO 2 etc.; then in the oxygen purifier 6, the H in the oxygen 2 O.CO 2 Wait for the adsorption, the CO in the oxygen after leaving the oxygen purifier 6 2 and H 2 The O content is not greater than 1ppm; the purified oxygen is sent to the plate heat exchanger 8, and is cooled to a liquid state by the backflow cold fluid in the plate heat exchanger 8; then part of the liquid oxygen is sent to the liquid oxygen pump 12, and then 12 is pressurized to 8.7MPaG high-pressure liquid oxygen...

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Abstract

A device and method for recovering by-product oxygen from electrolyzed water for hydrogen production using a low-temperature method are used to solve the waste problem of by-produced oxygen in a green electrolyzed water hydrogen production system. The device of the present invention includes: an oxygen purification system, a pressurization and heat exchange system, a cycle gas compression and expansion refrigeration system, and the recovery method of the present invention is to first purify and purify the by-product oxygen produced by electrolyzing water to remove the hydrogen in the oxygen, Carbon monoxide, carbon dioxide, water and other impurities are then liquefied, pressurized and heat exchanged to obtain the product oxygen and liquid oxygen at the required pressure. The cooling capacity during the whole process is provided by the circulating gas expansion refrigeration system. The present invention is highly coupled between systems, is suitable for the recovery of by-product oxygen under different pressure conditions, has a wide range of applications, and can also effectively recover oxygen, improve the comprehensive benefits of hydrogen production from green electrolyzed water, reduce the cost of green hydrogen production, and achieve safety, high efficiency and energy saving the goal of.

Description

technical field [0001] The invention relates to gas separation technology, in particular to a device and method for recovering by-product oxygen from electrolyzed water for hydrogen production by using a low-temperature method, and belongs to the technical field of hydrogen and oxygen production. Background technique [0002] As a kind of clean energy, green hydrogen energy is more and more used in the market. Using green power resources generated by renewable energy such as wind and water combined with green electrolysis water projects to produce green hydrogen is a method with good development prospects. When electrolyzing water to produce hydrogen, the cathode by-product oxygen is often directly vented, which is not safe and economical. How to recycle and rationally utilize the by-product oxygen of green electrolysis water hydrogen production in an environmentally friendly manner is an urgent problem to be solved in the current green electrolysis water hydrogen production...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B13/02C25B1/04F25B1/00F25B41/30
CPCC01B13/0237C25B1/04F25B1/00F25B41/30C01B2210/0053C01B2210/005Y02E60/36Y02P20/10Y02P20/133B01J23/40C25B15/083C25B15/085F25J2205/82F25J1/007F25J1/0072F25J1/0077F25J1/005F25J1/0052F25J2220/50F25J2235/50F25J1/0204F25J1/0017C01B13/0207C01B3/58C25B15/081B01J21/04B01J23/63C01B2210/0004
Inventor 韩一松谭芳彭旭东李玲姚蕾劳利建宋欣蒋云云赵东东谢小雨
Owner HANGZHOU HANGYANG
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