Coke oven gas hydrogen production technology

Abstract

The invention belongs to the technical field of coke oven gas hydrogen production. Aiming at solving the technical problems of existing coke oven gas hydrogen production that the pollution is serious and the hydrogen production quality is relatively poor, the invention provides a coke oven gas hydrogen production technology. The coke oven gas hydrogen production technology comprises the following steps: A, after carrying out first-grade pressurization on coke oven gas through a gas compressor, carrying out a pre-treatment procedure on the coke oven gas after the coke oven gas passes through an oil remover, obtaining oil-removed and purified coke oven gas; returning the oil-removed and purified coke oven gas back to the gas compressor, carrying out second-grade and third-grade pressurization and then conveying the coke oven gas out of a compression procedure to obtain compressed coke oven gas; B, enabling the compressed coke oven gas to enter from the bottom of a first oil removing tower and then enabling the compressed coke oven gas to directly enter an adsorption tower of a PSA (Pressure Swing Adsorption) hydrogen purification procedure; treating the compressed coke oven gas treated by the adsorption tower to obtain pressure swing adsorption crude hydrogen; C, introducing the pressure swing adsorption crude hydrogen into an oxygen removing tower; then cooling through a cooler to room temperature, so as to obtain oxygen removed hydrogen; conveying the oxygen removed hydrogen into an isobaric regenerated TSA (Temperature Swing Adsorption) drying procedure to obtain dry hydrogen. The coke oven gas hydrogen production technology has the characteristics of small pollution and good hydrogen production quality.

Description

technical field [0001] The invention belongs to the technical field of coke oven gas hydrogen production, and in particular relates 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 co...

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. Coal gasification hydrogen production using coal or coke as raw material is mostly used in the production process of chemical raw materials (methanol, synthetic ammonia). In recent years, there have been examples of direct hydrogen production. The investment (pressurized gasification such as GE, shell, etc.) is relatively large, and the process is long, and the treatment of "three wastes" is complicated, so the water-coal gasification method using coal or coke as raw material is generally not used to produce hydrogen

The traditional coke oven gas hydrogen production process takes a coking unit of 1 million tons / a as an example: the gas generation volume is 50000Nm 3 / h, of which about 25000Nm 3 / h as a circuit fuel, can have a surplus coke oven gas of 25000Nm 3 / h, the amount of hydrogen produced by pressure swing adsorption is only 15000Nm 3 / h, and a large amount of waste gas is vented, polluting the environment