After recycling in the chemical industry, coke oven gas retains impurities of sulfur, tar, naphthalene and benzene. When producing electricity from coke oven gas and CCPP, compressing coke oven gas, heating coke oven gas, cutting coke oven gas and producing chemical products from coke oven gas, production problems arise, such as clogging of nozzles, corrosion, excess SO2 emissions after combustion, carbon deposits and poisoning of catalysts, so deep purification of coke oven gas from harmful impurities is necessary.

Because blast furnace gas contains organic sulfur, H2S and other impurities, if blast furnace gas is used as fuel, the SO2 in the flue gas does not meet emission standards. There are two main measures to reduce emissions: blast furnace gas desulfurization or exhaust flue gas desulfurization.

Purification of carbon monoxide from a mixture containing carbon monoxide is carried out by PSA technology. First remove carbon dioxide, moisture and traces of sulfur from the feed gas; The purified gas enters the VPSA unit to remove hydrogen, nitrogen, methane and other impurities, the adsorbed carbon monoxide is removed as a product after vacuum desorption during decompression.

Coke oven gas has the characteristics of large gas volume, low pressure, complex impurity content and low hydrogen content. In addition to being used to generate electricity, hydrogen can be recovered for use in chemical plants such as coal tar hydrogenation plants, glycol plants and synthetic ammonia plants. High purity hydrogen gas is obtained from coke oven gas through compression, purification, conversion, PSA, etc. units. Through process integration, it is also possible to simultaneously produce CO, hydrogen and LNG products.

The production of hydrogen from natural gas consists of two parts: the conversion of gas vapor into converted gas and the purification of hydrogen using the PSA method. After compression and desulfurization, natural gas is mixed with water vapor. Under the action of nickel catalyst at a temperature of 750~850℃, natural gas is converted into converted gas consisting of hydrogen, carbon monoxide and carbon dioxide. The converted gas can be further converted into hydrogen and carbon dioxide by conversion technology, then the converted gas or reformed gas is purified and separated by PSA method to produce high purity hydrogen.

This process is based on the convenient source of methanol and desalting water as raw materials, at a temperature of 220-280°C, a special catalyst is catalyzed into converted gas containing hydrogen and carbon dioxide, the principle of which is as follows: Main reaction: CH3OH=CO+2H2 +90.7 kJ/mol CO+H2O=CO2+H2 -41.2 kJ/mol General reaction: CH3OH+H2O=CO2+3H2 +49.5 kJ/mol Auxiliary reaction: 2CH3OH=CH3OCH3+H2O -24.9 kJ/mol CO+3H2=CH4+H2O -+206.3 kJ/mol