Hydrogen extraction device and process for recovering tail gas components from synthetic hydrogen

Abstract

The invention relates to a hydrogen extraction device and process for synthesizing hydrogen and recovering tail gas components. The device comprises a cooler, a gas-liquid separator, an adsorption tower system, a clockwise-discharged gas buffer tank, a desorbed gas buffer tank and a desorbed gas compressor; the cooler is connected with the gas-liquid separator, the gas-liquid separator is connected with the adsorption tower system, the adsorption tower system is communicated with the clockwise-discharged gas buffer tank and the desorbed gas buffer tank, and the desorbed gas buffer tank is connected with the desorbed gas compressor. The adsorption tower system comprises eight adsorption towers, one of the adsorption towers is in a feeding adsorption state at any time, and the technological process comprises adsorption, four times of pressure equalizing and pressure reducing, clockwise releasing, counterclockwise releasing, washing, four times of pressure equalizing and pressure increasing and final product pressure increasing. The device is suitable for extracting hydrogen from methanol synthesis hydrogen recovery tail gas, hydrogen in the tail gas is further extracted effectively, a high-purity product is obtained, and the utilization rate of the tail gas is effectively increased. The method is simple in technological process and stable in operation, and the impurities in the mixed gas containing various impurities can be removed at a time to obtain a high-purity product.

Description

technical field [0001] The invention belongs to the field of industrial tail gas recovery, and in particular relates to a hydrogen extraction device and process for recovering tail gas components from hydrogen synthesis. Background technique [0002] The hydrogen content in the purge gas of the methanol synthesis unit is as high as 76%-77%, and the hydrogen content in the tail gas after membrane separation (hydrogen recovery) treatment is 42%-43%. In the past, the hydrogen recovery tail gas was used as fuel gas, and the resource utilization rate Low. How to repurify and utilize the hydrogen in the tail gas is a technical problem that needs to be solved urgently. Contents of the invention [0003] (1) Technical problems to be solved [0004] In order to solve the above-mentioned problems in the prior art, the present invention provides a device and a hydrogen extraction process for synthesizing hydrogen to recover tail gas components, mainly aiming at a process for hydrog...

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Problems solved by technology

[0002] The hydrogen content in the purge gas of the methanol synthesis unit is as high as 76%-77%, and the hydrogen content in the tail gas after membrane separation (hydrogen recovery) treatment is 42%-43%. In the past, the hydrogen recovery tail gas was used as fuel gas, and the resource utilization rate Low

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