生物油燃烧与污染物排放特性的数值模拟  

Numerical simulation of bio-oil combustion and pollutant emissions

作　　者：张栋[1] 陆强[1] 朱锡锋[1] 

机构地区：[1]中国科学技术大学安徽省生物质洁净能源重点实验室,合肥230026

出　　处：《科学通报》2010年第35期3416-3421,共6页Chinese Science Bulletin

基　　金：国家重点基础研究发展计划(20007CB210203);国家科技支撑计划(2007BAD34B02);国家自然科学基金(50930006);中国科学院知识创新工程方向性项目(KGCX2-YW-330)资助

摘　　要：应用CFD(computational fluid dynamics)软件FLUENT对实验室自砌小型窑炉装置内生物油的燃烧进行三维数值模拟.获得了炉膛流场、温度场、组分分布、火焰形状及污染物排放的详细信息,揭示了炉膛内部流动、燃烧及传热传质过程的特点.对不同过量空气系数下生物油的燃烧进行数值模拟,结果表明,随着过量空气系数的增加,炉膛内最高温度减小,燃烧区域增大,尾气中CO的浓度减小,但NO的浓度增加.模拟结果与试验数据吻合良好,验证了模型的可靠性,为燃烧工况的优化设计和污染物的控制提供了一定的依据.The commercial CFD-code FLUENT was used to simulate the bio-oil combustion in a lab-scale kiln. Three-dimensional numerical simulation was performed to obtain detailed information of the temperature and velocity fields,component distribution,flame shape and pollutant emissions,so as to reveal the characteristics of the flow,combustion,heat and mass transfer process in the kiln. The effect of excess air ratio on bio-oil combustion was also simulated. The results indicated that with the increasing of excess air ratio,the maximum combustion temperature and the CO concentration in the outlet were decreased,while the formation of NOX was increased. The simulation results agreed well with the experimental results,which confirmed the reliability of the model and would offer information for the combustion system optimization and pollutant control.

关 键 词：窑炉 生物油 燃烧 数值模拟 过量空气系数 

分 类 号：TQ511[化学工程]