随着国家环保部门对燃油汽车限行管理与排放要求的不断提高,天然气汽车、新能源电车成为当今汽车行业的发展趋势。天然气汽车具有低排放、抑制温室效应和摆脱对石油依赖的三大优点,正在世界范围内得到普及和推广。国内大型农用机械发动机功率大,存在高能耗和高排放问题,为进一步响应环保要求,以典型农用机械柴油发电机为研究对象,分析天然气-柴油双燃料发动机改造的供气方式、气源比选、技术方案、经济性等关键技术指标,论证项目的可行性,为后续农用机械双燃料发动机改造提供技术参考，也为今后船用发动机天然气-柴油双燃料改造和LNG船舶加注打下坚实的研究基础。

With the constant improvement of the national environmental protection department's requirements on the management and emission of fuel vehicles,natural gas vehicles and new energy trams have become the development trend of the automobile industry.Natural gas vehicles have the advantages of low emission, greenhouse restraining and non-reliance on oil.Large domestic agricultural machinery engine has high power with the problem of high energy consumption and high emissions.In response to the environmental requirement, based on typical diesel engine of agricultural machinery as the research object, the key indicators of the dual fuel renovation are analyzed, such as the gas supply methods, gas sources selection, technical scheme and economy. The feasibility of the project is demonstrated as well to provide the technology reference for renovation of agricultural machinery dual-fuel project in the future.