In this study, the main exhaust emissions from biogas fueled homogenous charge compression ignition (HCCI) engine model were investigated using a newly proposed reaction mechanism. The study was conducted by reducing a full detailed reaction mechanism using a combined algorithm built based on the graph-based approach. The exhaust emissions were estimated using a modified multi-zone combustion model. The chemical kinetics model was built using CANTERA reaction flow package and MATLAB® software. The new reduced mechanism (42 species and 228 reactions) showed higher agreement with the experimental data than the GRI-Mech 3.0 mechanism (53 species and 325 reactions). The effects of many parameters on emissions, including the equivalence ratio (0.25–0.4), CH4% (30%–80%), and the inlet intake temperature (420 K–500 K), were investigated. The results indicated that increasing the equivalence ratio above 0.25 increases the NOx emissions significantly as it increases the combustion peak bulk temperature. The same observation was obtained as the intake temperature and the CH4 content were increased above 420 K and 30% respectively and for the same reason. However, CO and unburned hydrocarbons (HC) emissions were decreased significantly as the equivalence ratio increased above 0.25, while they slightly changed with increasing the CH4% and the inlet intake temperature.

在这项研究中，使用新提出的反应机理研究了以沼气为燃料的均质充量压缩点火（HCCI）发动机模型的主要废气排放。通过使用基于图的方法构建的组合算法，通过减少完整的详细反应机制来进行研究。使用改进的多区域燃烧模型估算废气排放量。化学动力学模型是使用CANTERA反应流程软件包和MATLAB®软件建立的。与GRI-Mech 3.0机理（53种和325个反应）相比，新的还原机理（42个种类和228个反应）与实验数据显示出更高的一致性。研究了许多参数对排放的影响，包括当量比（0.25-0.4），CH4％（30％-80％）和进气口温度（420 K-500 K）。结果表明，当量比增加到0.25以上会显着增加NOx排放，因为它会增加燃烧峰值体积温度。由于相同的原因，进气温度和CH4含量分别增加到420 K和30％以上，因此获得了相同的观察结果。然而，当当量比增加到0.25以上时，CO和未燃烧的碳氢化合物（HC）的排放量显着降低，而当CH4％和入口进气温度升高时，它们的排放量略有变化。