Abstract:In order to improve combustion efficiency of natural gas(NG) and reduce pollution emission in nature gas engine, additional injection of hydrogen peroxide (H2O2) into the premix chamber is proposed. With the test of CO, HC and NOx concentration, exhaust temperature, NG consumption etc., it is found that the emission of HC、CO and NOx decreased and the dynamic and economic performance of CNG engine is improved. H2O2 can make reduction of the combustion temperature while increase of the oxygen concentration. The pivot factors affecting NOx emission are temperature and oxygen concentration. The optimum mass proportion of nature gas and H2O2 is between 4.5 and 5.8 for NG consumption and pollution emission.