【摘要】 介绍了火花点火式变组分煤层气发动机的主要设计过程。通过发动机台架试验,在不同点火提前角、不同甲烷浓度和不同压缩比时对该发动机的起动、怠速稳定性和排放特性进行了分析。结果表明,变组分煤层气发动机起动、怠速稳定,带负荷工作可靠。通过控制合适的空燃比,可以适应甲烷浓度大范围变动的煤层气燃烧。未燃HC和CO排放量随负荷、甲烷浓度增加而降低;NOx排放量随负荷、甲烷浓度增加而增加。更多还原

【Abstract】 This paper introduces the main processes of designing the engine fuelled with coalbed gas and ignited by spark plug. Under different spark advance, methane concentration and compression ratio, the operation stability and emission characteristics of the coalbed gas engine are discussed based on the results of engine bed testing. The test results show that startup and idle speed for the coalbed gas engine are stable and operation of the engine with loads is reasonable. By use of controlling the airfuel ratio, the engine can burn the coalbed gas the concentration of which changes at a large range. The emissions of unburned HC and CO decrease with the increase of load of the engine and methane concentration of coalbed gas. The NOx emissions increase with the increase of load of the engine and methane concentration of coalbed gas.更多还原