Effect of CO2 Dilution on Combustion and Emission Characteristics of Biogas

Abstract:

Effect of CO2 dilution on combustion and emission characteristics of CH4, H2 and CO was analyzed in a spark-ignition engine. The results showed that dilution could reduce NOx emission. Suitable dilution ratio had little influence on brake mean effective pressure, cyclical fluctuation and brake thermal efficiency. However, excessive dilution ratio would induce to partial burn. Favorable operation range of biogas could be obtained with acceptable brake thermal efficiency and NOx emission by employing dilution combustion, which benefits for biogas application.