High-efficient synthetic ammonia production process

The invention discloses a high-efficient synthetic ammonia production process. The high-efficient synthetic ammonia production process comprises the following steps: uniformly mixing anthracite coal with coke to obtain a mixture, adding the mixture into a fixed bed layer gas generator, and alternately introducing air and water vapor into the boiler, recycling heat of semi-water gas, generated by fuel gasification, through a combustion chamber and a waste heat boiler and then feeding the semi-water gas into a gasometer; 2, pressurizing the semi-water gas in the gasometer through a Roots blowerand entering into a variable-temperature adsorption process working section to remove benzene and naphthalene so as to obtain a crude raw material; 3, performing purification and impurity removal on the crude raw material, wherein the impurity removal process comprises a carbon monoxide conversion process, a desulfurization and decarbonization process and a gas refining process; 4, compressing thepurified hydrogen and nit