Method for making synthetic natural gas by utilizing coke oven gas

A method for making synthetic natural gas by utilizing coke oven gas includes that a carbon source is supplied to the coke oven gas after rough desulfuration so as to lead the volume percentage of the coke oven gas to meet stoichiometric ratio that (H2-3CO)/CO2 is approach to 4, the coke oven gas is compressed to increase the pressure to be 0.5-5.4MPa, refined desulfuration is carried out and then the coke oven gas is led into a methanator, methanation reaction is carried out under the action of Ni series catalyst, thus obtaining artificial natural gas and further obtaining liquid natural gasby preparation. The invention, by supplying carbon into the coke oven gas, optimizes stoichiometric ratio of H2, CO and CO2 in the coke oven gas and improves the yield of synthetic natural gas. The synthetic natural gas making technology of the invention is suitable for a coke-oven plant with yield of dozens to hundreds tons, thus making the best of H2, CO and CO2 in the coke oven gas and the supplied CO2 and having reali