常温空气MILD燃烧过程中CO形成特性

CO Formation Mechanism in Methane MILD Combustion Without Preheated Air

采用实验和数值计算的方法,研究了甲烷在常温空气下的MILD燃烧.计算结果表明耦合机理GRI-Mech2.11的数值计算模型能很好地预测炉内CO、O_2和温度等参数.通过模拟发现,可以将整个炉膛划分成3个区域(Ⅰ:中心区,Ⅱ:高浓度区,Ⅲ:回流区),在不同区域内,CO的生成与消耗是不同的,其中CO的生成反应主要为(R166)(HCO+H_2O■H+CO+H_2O)、(R167)(HCO+M■H+CO+M)、(R168)(HCO+O_2■HO_2+CO),CO的消耗反应主要为(R99)(OH+CO■H+CO_2).

Methane MILD（moderate or intense low-oxygen dilution）combustion without preheated air was studied ex-perimentally and numerically.The result shows that the numerical simulation of coupling GRI-Mech 2.11 can well predict CO,O2 and temperature in the furnace.The furnace can be divided into three zones（Ⅰ：central zone,Ⅱ：high concen-tration zone,Ⅲ：recycle zone）through modeling,and the CO generation and consumption are different in the three zones.The major CO generation reactions are （R166）（HCO＋H2O H＋CO＋H2O）,（R167）（HCO＋M H＋CO＋M）and（R168）（HCO＋O2 HO2＋CO）,and the major CO consumption reaction is （R99）（OH＋CO H＋CO2）.