Process for the production of biogas and biogas plant for carrying out the process

摘要

Process for the production of biogas by fermentation of biomass in a biogas plant comprising the steps - fermentation of the biomass in at least two stages, namely in a hydrolysis stage and a methanation stage, - converting at least a portion of the hydrolysis gas generated in the hydrolysis stage into thermal energy, the The conversion into thermal energy provided part of the hydrolysis gas has a methane content of a maximum of 30 vol .-% and this is mixed with 1 to 5 vol .-% air before the conversion into thermal energy and - reduction of the carbon dioxide content of the biogas produced by at least one cleaning step, the thermal energy generated being used to cover the energy requirements of the cleaning step.