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针对可燃气体的存在有可能使发动机由于空气不足而使燃料不能充分燃烧,发动机动力性、经济性下降的问题,分析了气体燃料成分及性能参数,推导了气体-柴油双燃料发动机与柴油机相比的动力性变化计算公式.采用了气化炉热解气化各种农林废弃的生物质产生生物制气,由单缸、四冲程、水冷、直喷式柴油机改装了双燃料发动机,生物制气通入发动机进气管,在进气过程中吸入气缸,由柴油引燃.测量了机刨花热解制气双燃料发动机不同引燃柴油量时的发动机动力性,理论分析结果与试验结果吻合较好.分析结果表明,燃气低热值减少,气体-柴油双燃料发动机动力性变差;引燃柴油量减少,气体-柴油双燃料发动机动力性也变差.
Because of the existence of combustible gas, it is possible to make the engine unable to fully burn the fuel due to the shortage of air, and to reduce the engine power and economy. The gas fuel composition and performance parameters are analyzed, and the comparison between the gas-diesel dual fuel engine and the diesel engine is deduced Of the dynamic changes in the formula using gasifier pyrolysis gasification of a variety of agricultural and forestry abandoned biomass bio-generated gas from a single cylinder, four-stroke, water-cooled, direct injection diesel engine modified dual-fuel engine, bio-gas The engine intake pipe was introduced into the cylinder, which was sucked into the cylinder during the intake process, and was ignited by diesel oil.The engine dynamic performance was measured when the diesel engine was ignited with different amount of diesel fuel. The theoretical analysis and experimental results are in good agreement The analysis results show that the decrease of low calorific value of gas and the deterioration of engine performance of gas - diesel dual fuel engine decrease the amount of pilot diesel fuel and the dynamic performance of gas - diesel dual fuel engine also deteriorates.