氮气稀释富氢合成气高压燃烧特性数值模拟

Numerical study on combustion characteristics of nitrogen diluted hydrogen-rich syngas at high pressures

为研究高压下氮气稀释富氢合成气的微混合燃烧规律,利用常压燃烧试验校正模型对不同压力、功率和当量比下的温度场、火焰形态以及污染物排放进行了计算分析。结果表明,随着压力的升高,燃烧器火焰温度和出口温度先升高后略微下降,火焰宽度逐渐变小,火焰高度有增大趋势,NOx排放指数升高,但在压力>14 MPa时,趋势变缓。

Aiming at investigating the micro-mixing combustion characteristics of nitrogen diluted hydrogen-rich syngas at high pressures,the combustion model corrected at atmospheric pressure was adopted to ana-lyze the temperature field,flame shape and pollution emissions under conditions with different pressures, powers and equivalent ratios.The results show that,with an increase in pressure,the flame temperature and outlet temperature of the burner rose first and then dropped slightly;the flame width decreased gradu-ally while its height grew;the NOx emission indexes increased and tended to be smooth when the pressure increased to higher than 1 4 MPa.