Method for recovering and extracting hydrogen based on discharged torch waste gas

Abstract

The invention relates to a method for recovering and extracting hydrogen based on discharged torch waste gas, which comprises the following steps: 1) transformation: carrying out transformation treatment on the waste gas by using a sulfur-tolerant cobalt transformation catalyst, mixing steam and the waste gas in a mixing tank, entering a transformation bed to carry out transformation reaction, and converting CO into hydrogen through the transformation reaction; 2) decarburization: entering an adsorption bed for decarburization, removing most of ineffective components in the converted gas, and performing high-pressure adsorption and low-pressure desorption; and 3) separation and purification: separating the decarbonized waste gas, adopting a single-bed adsorption procedure, and filling adsorbents activated aluminum oxide, activated carbon and molecular sieves in an adsorption bed. The method is free of raw material cost, a novel catalyst and an adsorbent are used according to the composition of the waste gas, and hydrogen with the purity larger than or equal to 99.8% is extracted. The C emission content and the comprehensive energy consumption of the production line are reduced while the operation cost of the production line is reduced. The economic and social benefits are obvious.

Description

technical field [0001] The invention belongs to the technical field of waste gas recovery, and in particular relates to a method for recovering hydrogen based on exhaust torch waste gas recovery. Background technique [0002] At present, most of the waste gas treatment methods produced by the separation and purification of PSA in China are torch combustion emission, and only a few enterprises have recovered the waste gas, but the recovery effect is not ideal, and the recovery rate is less than 50%. The combustion emission of PSA exhaust gas not only causes the waste of effective components in the exhaust gas, but also increases the content of C emission in the atmosphere by burning CO2, which has a bad impact on the atmospheric environment. [0003] At present, the waste gas produced by the PSA of the applicant Juyin Company is treated in two ways: steam boiler recovery and torch combustion. Due to the limited ability of steam boilers to recover waste gas, 70% of the waste g...

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Problems solved by technology

[0002] At present, most of the waste gas treatment methods produced by the separation and purification of PSA in China are torch combustion emissions, and only a few enterprises have recycled the waste gas, but the recovery effect is not ideal, and the recovery rate is less than 50%.

The combustion emission of PSA exhaust gas not only causes waste of effective components in the exhaust gas, but also increases the content of atmospheric C emissions by combustion of CO2, which has a bad impact on the atmospheric environment.

[0003] At present, the waste gas produced by the PSA of the applicant Juyin Company is treated in two ways: steam boiler recovery and torch combustion. Due to the limited ability of steam boilers to recover waste gas, 70% of the waste gas is still discharged through torch combustion, which endangers employees. The physical and mental health of surrounding residents restricts the high-quality and sustainable development of enterprises

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