Process and plant for the purification of raw or biogas for the production of methane

摘要

Process for the purification of raw or biogas for the production of methane, wherein contained in the raw or biogas components such as carbon dioxide, sulfur compounds, ammonia and other water-soluble substances are separated in a multi-stage cleaning process, characterized in that the cleaning process in at least three immediately successively following purification steps and using circulating additional fresh water is performed, wherein a) the discharged from a plant to be purified crude or biogas as the first purification stage under atmospheric pressure or at a pressure of up to 6 bar a wash column (K1) with Packed bed of countercurrent to the supplied fresh water flows through and fresh water in the carbon dioxide, hydrogen sulfide, ammonia, and other contained in the crude or biogas organic water-soluble substances are bound, and at the top of the wash column (K1) methane gas with a methane content of at least 60% abgezo b) in the second purification stage from the contaminated washing water discharged from the washing stage (K1) in a first stripping column (K2) with random packing or packing ...