BIOGAS UPGRADING PROCESSES FOR THE PRODUCTION OF NATURAL GAS SUBSTITUTE

摘要

Biogas from anaerobic digestion of biological wastes is a renewable energy resource. It has been used to provide heat, shaft power and electricity. Typical biogas contains 50-65% methane (CH4), 30-45% carbon dioxide (CO2), moisture and traces of hydrogen sulphide (H2S). Presence of CO2 and H2S in biogas affects engine performance adversely. Reducing CO2 and H2S content will significantly improve quality of biogas. In this work, a method for biogas scrubbing and CH4 enrichment is presented. Chemical adsorption of H2S and chemical absorption of CO2 by in a biomethane unit was experimentally investigated.