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N2和CO2稀释对天然气发动机燃烧和NOx排放的影响

, PP. 1115-1123

Keywords: 动力机械工程,天然气发动机,N2稀释,CO2稀释,NOx排放,燃料消耗率

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Abstract:

为改善天然气发动机be-NOx“此消彼长”的变化关系,以一台六缸天然气发动机为试验对象,在1450r/min、50%负荷下,保持转速、点火时刻、节气门开度、燃料量等不变,研究了N2和CO2稀释对燃烧和NOx排放的影响。结果表明:与CO2稀释相比,N2稀释能有效改善be-NOx“此消彼长”的变化关系。N2稀释抑制NOx生成的主要因素是其稀释效应;而CO2稀释抑制NOx生成的主要因素是其热效应。当稀释比或NOx排放相同时,与CO2稀释相比,采用N2稀释时混合气的燃烧速率较快,因而可获得较高的燃料经济性。

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