Coke oven gas hydrogen generation process

Abstract

The invention relates to a coke oven gas hydrogen generation process. The process comprises the following steps of: firstly, treating coke oven gas in a pre-purification process step and a refined naphthalene process step, and then feeding the coke oven gas into a PSA-1 system mainly comprising 12 adsorption towers for removing most of carbon dioxide in an adsorption manner; then delivering the coke oven gas into a PSA-2 system mainly comprising 10 adsorption towers for remove most of methane gas in an adsorption manner, then increasing the pressure of the obtained hydrogen-rich gas to 2.6MPa, and deoxidizing and cooling in a deoxidation system by using the compression heat of the gas; and finally, and finally carrying out hydrogen purification in a system to obtain product hydrogen. According to the coke oven gas hydrogen generation process, the coke oven gas is subjected to mature processes including PSA hydrogen extraction, methane steam conversion, transformation and the like which are scientifically combined together, 40110Nm<3>/h of hydrogen of which the purity is 99.9% can be generated from 50000Nm<3>/h of the coke oven gas, the yield rate is high, 22508Nm<3>/h of a mixed desorption gas of which the caloric value is 4276-4636kcal/Nm<3> is generated secondarily and returned to a coking unit, and the demand on coke fuel is met. According to the coke oven gas hydrogen generation process, the hydrogen output is doubled, the waste gas discharge is reduced, and the process adjustment is flexible.

Description

technical field [0001] The invention relates to the technical field of chemical production, in particular to a coke oven gas hydrogen production process. Background technique [0002] At present, the coal tar output of traditional craft coking units in my country has exceeded 22 million tons, especially in the central and western regions of Inner Mongolia, Shanxi and Shaanxi. The total design processing capacity of the coal tar processing industry is about 14.95 million tons, plus the under construction and expected production capacity of 2.5-3 million tons, the total production capacity is expected to be about 17 million tons. Due to economic depression at home and abroad, high energy consumption and high pollution of traditional processes, the actual operating rate of deep processing projects approved by the state in 2011 was about 60%, and the actual consumption of coal tar by sub-capacity was about 9.269 million tons; accounting for the total coal tar 52.97% of the tota...

AI Technical Summary

Problems solved by technology

In the prior art, the sources of hydrogen are mainly the following: 1. Using methanol as a raw material and adopting a steam reforming method or using liquid ammonia as a raw material to produce hydrogen by ammonia cracking, but these two methods have relatively high production and operation costs and are not suitable for Large Hydrogen Plant

2. Hydrogen is produced by electrolysis. This process consumes a lot of electricity and has high production costs. It is only used in enterprises that use a small amount of hydrogen, require high purity, and produce high value-added products (such as rare metal manufacturing). Therefore, for companies that require a large amount of hydrogen consumption Chemical industry is not suitable

3. Hydrogen production by coal gasification using coal or coke as raw material. This method is mostly used in th

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