华北水利水电大学 电力学院，河南 郑州 450011
为了研究煤粉与生物质气混燃对锅炉燃烧特性以及燃烧产物的影响，基于 Aspen软件搭建了生物质气化模型，得到气化效率最高时的生物质气；基于 Fluent 软件搭建生物质气与煤粉的混合燃烧模型，在保证锅炉总输入热不变的情况下，分析煤粉锅炉掺烧 10%不同的生物质气的锅炉炉膛温度分布和主要的烟气组分。结果表明：在分别掺烧 10% 的松木气、秸秆气和木屑气后相对于纯煤粉燃烧，炉膛燃烧区温度由 1 843 K 下降到 1 789 K，炉膛出口烟温增大，O2 和CO出口体积分数增大，CO2 出口体积分数降低，Nox 出口质量浓度值由原来的 548 mg/Nm3 降到500 mg/Nm3 以下North China University of Water Resources and Electric Power,Zhengzhou,China,Post Code: 450011
In order to explore the influence of co-firing pulverized coal and biomass gas on the combustion characteristics and combustion products,the gasification model was established based on Aspen plus to obtain the biomass gas with maximum gasification efficiency. The co-firing model was then established in Fluent to analyze the boiler furnace temperature distribution and mean flue gas components of co-firing pulverized coal with 10% different biomass gases,under constant total input heat into the boiler. The results showed that compared to pure pulverized coal combustion,co-firing 10% pine gas,straw gas and sawdust gas,respectively,the temperature of the furnace combustion temperature decreases from 1 843 K to 1 789 K,and the furnace outlet temperature increases. The O2 and CO volume fraction increase,while the CO2 volume fraction decreases. The NOx value at the furnace outlet reduces from 548 mg/Nm3 to 500 mg/Nm3.
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