Comparison of effects of spark timing and fuel ratio on engine efficiency and $NO_x$ emission for fuel of city gas and syngas($H_2$ and CO)

도시가스와 혼합가스($H_2$, CO) 적용 시 점화시기 및 공연비에 따른 발전효율 및 질소산화물 배출량 비교

Research on usage of syngas produced by waste gasification is on going all around the world. Syngas which consists of $H_2$, CO, $CO_2$, $N_2$, has different combustion characteristics from current city gas; due to distinct flame propagation speed of the fuel, syngas has different spark timing and air fuel ratio at maximum generating efficiency. This is why finding both the optimum point of spark timing and air fuel ratio is so important in order to improve thermo efficiency and secure stable running of gas generated by relatively low heating value syngas. Moreover, since emission of $NO_x$ is strictly regulated, it is important to operate lean burn condition that reduces NOx emission.