One-stage hydrogen separating and purifying method based on pressure swing adsorption membrane and device for realizing same

Abstract

The invention discloses a one-stage hydrogen separating and purifying method based on a pressure swing adsorption membrane and a device for realizing the same. The method comprises the following steps of: a, adsorption, wherein feed gas with hydrogen content of 75%, carbon dioxide content of 24.5%, carbon monoxide content of 0.5% and pressure of 1.2Mpa is fed into an adsorption tower, a hydrogen purification adsorbent filled in the adsorption tower adsorbs the carbon dioxide and the carbon monoxide in the feed gas, effective gas component hydrogen is output from the top of the adsorption tower, and the product hydrogen is sent to a user from the device through an outlet valve; and b, regeneration, wherein after the feed gas is adsorbed in the adsorption tower, equalized pressure drop and inverse discharge are performed on the adsorption tower, inversely discharged gas enters into a membrane separation unit, infiltration gas is stored in a buffer tank and then returned into the evacuated adsorption tower, and finally equalized pressure increasing and final charge are performed on the adsorption tower. By utilizing the process, the size of a pressure swing adsorption device can be reduced, the hydrogen yield is improved, and the cost is lowered.

Description

technical field [0001] The invention relates to the field of hydrogen purification, in particular to a method for separating and purifying hydrogen by a one-stage pressure swing adsorption membrane and a device for realizing it. Background technique [0002] Both pressure swing adsorption technology (PSA) and membrane separation technology can be used to produce hydrogen from cracked gas. Pressure swing adsorption (PSA) produces high-purity hydrogen above 99.9%. It is used in small-scale one-stage pressure swing adsorption hydrogen production units. In order to increase the yield and reduce operating costs, multiple pressure equalizations are used, but the hydrogen yield Generally, it will not exceed 92%, and the one-time investment is relatively large. For a long time, due to the characteristics of pressure swing adsorption (PSA), the yield of product hydrogen is inversely proportional to the purity of product hydrogen, resulting in low product hydrogen yield under the req...

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Problems solved by technology

For a long time, due to the characteristics of pressure swing adsorption (PSA), the yield of product hydrogen is inversely proportional to the purity of product hydrogen, resulting in low product hydrogen yield under the requirement of high-purity product hydrogen. Therefore, in the existing pressure swing adsorption technology The process of producing high-purity hydrogen in (PSA) has caused a huge waste of resources

[0003] Membrane separation technology is also used in the hydrogen production process. Although the use of membrane separation technology can reduce energy consumption, reduce one-time investment and high yield, the purity of the hydrogen produced generally does not exceed 99.8%. When the flow exceeds 10,000-20,000 standard cubic meters per hour, the one-time investment in membrane separation will increase significantly

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