Effects of CH4, H2 and CO2 Mixtures on SI Gas Engine

Performance of a four-stroke spark ignition gas engine operated on mixtures of CH4, H2 and CO2 was studied. Experiments were carried out at a constant engine speed of 2,000 rpm and throttle opening of 14% with various equivalence ratios. The results showed that the highest brake power output of 12.5 kW and 35% thermal efficiency were achieved when operated with the mixture of 69.70% CH4, 9.95% H2 and 20.45% CO2 and the equivalence ratios between 1.0 and 0.82.