Coke oven gas adsorption reinforced catalytic hydrogen producing process and apparatus

Abstract

The coke oven gas adsorption reinforced catalytic reaction process for producing hydrogen includes the following steps: 1. heating fresh catalyst in a reactor to decompose and introducing hydrogen to reduce the catalyst; 2. introducing coke oven gas into the reactor to produce catalytic hydrogen producing reaction; 3. regenerating catalyst when it is needed; and 4. repeating the steps 2 and 3. The present invention converts CO, methane and other lower carbon hydrocarbons into hydrogen, raise the utilization rate of methane and other impurity in coke oven gas. Through reaction conversion, the hydrogen concentration in coke oven gas is raised from 50-60 % to over 90 %.

Description

technical field [0001] The invention relates to a coke oven gas adsorption enhanced catalytic reaction hydrogen production method and a device thereof. Background technique [0002] Coke oven gas is a mixed gas produced in the production process of metallurgical enterprises, of which hydrogen content is 50-60%, methane is about 25%, carbon monoxide is about 6%, and the rest is nitrogen, oxygen, C 3 Hydrocarbon, C 4 Hydrocarbons and trace components such as tar, naphthalene, and benzene. [0003] At present, the method of producing hydrogen from coke oven gas in the industry mainly adopts physical processes such as pressure swing adsorption. After multiple processes such as naphthalene removal, compression, pre-purification, temperature swing adsorption, pressure swing adsorption, and deoxygenation drying, the hydrogen concentration is purified to more than 99.99%. , to achieve the purpose of producing pure hydrogen. The prepared hydrogen is used in the cold rolling proces...

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Problems solved by technology

The advantage of pressure swing adsorption for coke oven gas is that it is simple to operate, but there are problems such as long process, large investment, removal of high boiling point impurities and trace oxygen in the product, etc., which directly affect the stability of the process.

In addition, the process of purifying hydrogen through the physical process of pressure swing adsorption needs to remove about 40% of impurities other than hydrogen through pressure swing adsorption, which will inevitably increase the load on the pressure swing adsorbent and shorten the service life of the adsorbent; The mixed gas containing methane, carbon monoxide, carbon dioxide and low-carbon hydrocarbons removed by pressure swing adsorption in the process is used as fuel, which has not been fully utilized; since the outlet gas temperature of coke oven gas is 700-800 ° C, it is necessary to cool down and then use pressure swing adsorption , resulting in heat loss

Therefore, the method of only using pressure swing adsorption to purify coke oven gas has obvious defects and deficiencies in terms of technology and energy utilization.

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