Compression of ammonia synthesis and recycle gas

A method, not utilized before, for compressing pure ammonia synthesis gas N2+3H2 or with limited content of methane and inert gases and recycle gas by screw compressors. The synthesis gas screw compressors compressing ammonia synthesis gas with a pressure of between 20 bar and 35 bar, with a volume limited to 60,000 standard cubic metres per hour up to 100 bar discharge pressure, according to the block flow drawing shown with the three different configurations of the compressor system.

• That the method leads to the utilization of spare heat from conventional steam reformer and partial oxidation synthesis gas preparation units providing high energy efficiency and low capital cost.