FIELD: chemistry.
SUBSTANCE: invention relates to chemistry. The method of producing synthesis gas for ammonia synthesis involves feeding a gas stream containing hydrocarbons and a gas stream containing steam into a primary conversion apparatus which is equipped with a plurality of externally heated catalyst tubes, reaction of said hydrocarbons with steam in the catalyst tubes of the primary conversion apparatus at operating pressure therein of at least 45 bar to obtain a product gas, feeding the product gas and a stream of oxidative gas into a secondary conversion apparatus, reaction of the product gas with the oxidative gas and subsequent secondary conversion while providing conversion of all hydrocarbons contained in the product gas coming from the primary conversion apparatus to obtain converted gas which contains hydrogen, carbon oxides and unreacted steam, removing carbon oxides from the converted gas and obtaining synthesis gas which is suitable for synthesis of ammonia. The oxidative gas used is oxygen-rich air with molar ratio N2/O2 which enables to obtain converted gas with nitrogen content which corresponds to content which is required for stoichiometric molar ratio H2/N2 for ammonia synthesis.
EFFECT: method enables to achieve high production capacity of synthesis gas and lower capital costs and power consumption.
5 cl, 1 dwg
