燃用生物质气化气的内燃机特性分析

Performance analysis of internal combustion engine fueled with gas derived from biomass gasification

生物质气化气的组分对内燃机的排气温度、最大爆发压力、有效热效率和尾气排放都具有重要影响。各种气体成分的燃烧速率以及其中的阻燃成分都直接影响气缸内混合气的燃烧,同时影响内燃机的尾气排放。分析发现内燃机的排气温度过高、爆发压力偏低、能耗偏高的主要原因是由于生物质气化气热值低、燃烧速度慢;通过对尾气排放的测试分析发现,混合气的完全燃烧可以降低碳烟、CO和HC的排放,降低燃烧温度可以降低NOx的生成率。

The composition of fuel gas derived from biomass gasification has significant impact on the exhaust temperature, peak fire pressure, effective thermal efficiency and flue gas emission of internal combustion engine. The combustion rate of each gas component and the flame-retardant composition in the fuel gas influence the combustion of mixed gas in the cylinder, and simultaneously influence the gas emission. The results show that the low gas heating value and slow gas combustion velocity in the cylinder are main reasons of higher exhaust temperature, lower peak fire pressure and higher energy consumption. The analysis of the fuel gas emission test shows that complete combustion of the mixed gas can reduce the emission of smoke, CO and HC, NOx emission can be decreased by reduction of combustion temperature.