System and method for purifying hydrogen from coke oven gas

The invention relates to the technical field of chemical equipment, and discloses a system and a method for purifying hydrogen from coke oven gas, the system comprises a normal pressure adsorption unit, a chemical absorption unit, a membrane separation unit and a pressure swing adsorption unit, the normal pressure adsorption unit is provided with a coke oven gas inlet, and a gas outlet of the normal pressure adsorption unit is connected with a gas inlet of the chemical absorption unit; a gas outlet of the chemical absorption unit is connected with a gas inlet of the membrane separation unit through a first compressor, a low-pressure gas outlet side of the membrane separation unit is connected with a gas inlet of the pressure swing adsorption unit through a second compressor, and a hydrogen outlet is formed in the pressure swing adsorption unit. Through coupling integration of normal-pressure adsorption, chemical absorption, membrane separation, pressure swing adsorption and other units, fuel cell hydrogen mee