煤粉和生物质气混燃锅炉燃烧特性数值模拟研究  

Numerical Simulation Study on the Boiler Combustion Performance for Biomass Gas Co-firing with Pulverized Coal

作　　者：张小桃[1] 闻猛 丁全斌 刘莹[1] 

机构地区：[1]华北水利水电大学电力学院,河南郑州450011

出　　处：《热能动力工程》2017年第3期82-87,共6页Journal of Engineering for Thermal Energy and Power

基　　金：河南省教育厅自然科学研究计划项目(2011A140014);河南省科技发展计划(112102210281)

摘　　要：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,O_2和CO出口体积分数增大,CO_2出口体积分数降低,NO_x出口质量浓度值由原来的548 mg/Nm^3降到500 mg/Nm^3以下。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 O_2 and CO volume fraction increase,while the CO_2 volume fraction decreases. The NO_x value at the furnace outlet reduces from 548 mg/Nm^3 to 500 mg/Nm^3.

关 键 词：生物质气 混燃 温度分布 烟气组分 

分 类 号：TK224.11[动力工程及工程热物理—动力机械及工程]