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The ignition characteristics of each component of natural gas and the chemical kinetic factors determining those characteristics were investigated using detailed chemical kinetic calculations. Ethane (C2H6) showed a relatively short ignition delay time with high initial temperature; the heat release profile was slow in the early stage of the ignition process and rapid during the late stage. Furthermore, the ignition delay time of C2H6 showed very low dependence on O2 concentration. In the ignition process of C2H6, HO2 is generated effectively by several reaction paths, and H2O2 is generated from HO2 and accumulated with a higher concentration, which promotes the OH formation rate of H2O2 (+ M) = OH + OH (+ M). The ignition characteristics for C2H6 can be explained by H2O2 decomposition governing OH formation at any initial temperature.

Recently, producing energy with reduced CO₂ emissions has been one of the most important topics of global discussion. Combined heat and power (CHP) systems, which use natural gas to produce thermal energy and electric energy simultaneously, are considered to contribute significantly to the efficient use of energy and environmental conservation. The prevalence of CHP systems is expected. From an energy security point of view, promoting the introduction of distributed energy systems, which use natural gas, is highly recommended. In a CHP natural gas engine, enhancing engine efficiency is required to save energy. The challenge with spark ignition (SI) engines is how to improve destabilizing firing in the situation of a mixed lean burn and exhaust gas recirculation (EGR) condition. This is especially important in large size of lean combustion natural gas engines, which use a pre-chamber to maintain spark ignition performance, while also avoiding knocking.