METHOD FOR EXTRACTING HYDROGEN FROM A GAS CONTAINING METHANE, ESPECIALLY NATURAL GAS AND SYSTEM FOR CARRYING OUT SAID METHOD

摘要

The invention relates to a method for extracting hydrogen from a gas containing methane, especially natural gas. Hydrocarbons contained in the ga s are catalytically broken down in a reformer (4) by steam in order to form hydrogen, carbon monoxide and carbon dioxide. Catalytic conversion of the obtained carbon monoxide with steam occurs in a downstream conversion step i n order to form carbon monoxide and water. Carbon dioxide is removed from the converted gas flow (8) by gas washing (7), and the washed hydrogen-rich gas flow (10) is subsequently divided in a pressure-swing adsorption system (11) into a product gas flow (12) made of hydrogen and a waste gas flow (13). The waste gas flow (13) is introduced with hydrogen (14), which is separated fro m the gas flow (10) after gas washing, into a reformer (4) which is essentiall y a carbon-free combustible gas, and is combusted there. The invention also relates to a system for carrying out said method.