Process and plant for the treatment of biogas for feeding into L-gas networks

摘要

Process for the treatment of biogas for feeding into natural gas networks of quality grade L-gas, where from the biogas impurities such as NH3, H2S, SO2 and COS (organic sulfur compounds) removed, contained in biogas CO2 are almost completely separated, characterized in that air in Oxygen gas and nitrogen gas with at least 95 vol .-% nitrogen are decomposed, the nitrogen gas cached and added to the high-purity methane dosed before feeding into the L-gas network for calorific value reduction and the methane / nitrogen gas mixture (L-gas) is dehumidified, and Oxygen gas for biocatalytic desulfurization of biogas is introduced into the fermenter of the biogas plant or fed to a downstream separate desulfurization.