Method and device for one-stage pressure swing adsorption hydrogen extraction and carbon-rich gas recovery

Abstract

The invention discloses a method and a device for one-stage pressure swing adsorption hydrogen extraction and carbon-rich gas recovery. The method adopts a pressure swing adsorption principle. Through the method and the device, high-purity hydrogen is extracted from methanol synthesis discharge gas and is utilized as product gas; simultaneously, high-purity carbon-rich gas produced in recovery desorption is utilized as feed gas utilized for a methanol device; produced concurrently discharged hydrogen with high concentration is fed back to a methanol system; and produced concurrently discharged replacement gas with low concentration is utilized as fuel gas and is discharged into a fuel pipe net. Each one cycle of the method comprises a adsorption process, a concurrent discharge process, a displacement process, a countercurrent discharge process, a vacuum-pumping process, a even pressure rise process and a final stroke process. Compared with a conventional two-stage method-based hydrogen extraction technology, the method provided by the invention improves a total hydrogen recovery rate and a product hydrogen recovery rate of the device. Through the method and the device, high-purity carbon-rich gas can be extracted from analysis gas. The device has the advantages of low cost, small floor space and good economic benefits.

Description

[0001] technical field [0002] The invention relates to a pressure swing adsorption hydrogen production device, in particular to a method and device for extracting hydrogen and recovering carbon-rich gas by one-stage pressure swing adsorption which can greatly improve the recovery rate of carbon-rich gas. [0003] Background technique [0004] In similar devices for coke oven gas conversion to methanol or co-production of ammonia (or hydrogen-requiring products), the raw material gas contains hydrogen, carbon dioxide, carbon monoxide, nitrogen and other gas components, and the two-stage hydrogen production method is generally adopted, that is, the raw material gas is first Crude hydrogen is obtained through the pressure swing adsorption decarburization process, and the carbon-containing gas (carbon-rich gas) analyzed in the decarburization process is returned to the methanol system, and then the crude hydrogen is processed through the molecular sieve pressure swing adsorpti...

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Problems solved by technology

[0005] The invention mainly solves the technical problems of large investment in hydrogen extraction equipment, low hydrogen recovery rate, low recovery rate of carbon monoxide and carbon dioxide, and high hydrogen production cost in the second-stage method; it provides a hydrogen production method that can fully recover carbon monoxide and carbon dioxide, has high hydrogen purity, and has a total A method and device for extracting hydrogen by pressure swing adsorption and recovering carbon-rich gas with high hydrogen recovery rate, low equipment investment, small footprint, and good overall economic benefits of the device

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