PROCESS FOR CONVERTING COAL AND / OR HEAVY OIL FRACTIONS INTO HYDROGEN OR AMMONIA SYNTHESIS GAS

摘要

A PROCESS FOR CONVERTING COAL AND/OR HEAVY PETROLEUM FRACTIONS INTO HYDROGEN OR AMMONIA SYNTHESIS GAS. Hydrogen or ammonia synthesis gas consisting substantially only of hydrogen and nitrogen is prepared from coal and/or heavy petroleum fractions by gasification with steam and an oxygen-containing gas, cooling the thusformed crude gas by quenching and/or steam production, scrubbing the cooled gas to remove soot and other solid impurities, re-heating by heat exchange with exit gas from a subsequent conversion step, shift-converting the re-heated, soot-free crude gas to convert its CO by passing the gas through one ore more catalyst beds of one or more sulfurresistant shift catalysts, removing acid gases (notably H2S and CO2) from the shift-converted gas and finally subjecting the gas to a catalytic methanation to convert remaining amount of carbon oxides to methane. If the process is used for preparing ammonia syngas, the gasification is conveniently carried out with oxygen-enriched air and steam.