焦炉复合煤气加热氮氧化物形成模拟研究

Simulation Investigation of NOx Production During Coke Oven Heating and Combustion Utilizing Complex Coal gas

以焦炉煤气(COG)、贫煤气(BFG)、驰放气(MPG)为加热煤气,利用Gibbs自由能最小原理对焦炉加热氮氧化物(NOx)形成进行了热力学平衡分析。烟气NOx含量最高的为NO,占99.65%以上;随着空气过剩系数的升高,NO含量呈现先升高后下降的趋势,最高为3147.42×10-6(α=1.4),烟气温度最高为1837.54℃(α=1.0);烟气循环量70%(199.29×10-6)较30%(3503.42×10-6)NO下降94.31%;焦炉煤气贫化有助于烟气NO含量降低,贫煤气掺混效果好于驰放气。

Based on the minimization of the total Gibbs free energy, thermodynamic analysis of COG, BFG, and MPG combustion for NOx production was explored. The NO content of the flue gas was highest in nitrogen oxides（ 〉99.65% ） . With the increasing α value, the NO content increase initially, and then decrease gradually. The maximal amount of the NO content was 3147.42 × 10^-6 （ α = 1.4）, and the maximum temperature was 1837.54 ℃（ α = 1.0）. With an increase in reflux ratio （ from 30% to 70% ）, the NO content decreased by 94.31% （ 3503.42 × 10^-6 - 199.29 × 10^-6 ）. COG dilution was helpful to reduce NO content in flue gas, and BFG mixing effect was better than MPG obviously.