直流煤粉射流着火稳定性指数研究  

Research on combustion stability indexes of pulverized coal jet

作　　者：王伟[1] 汪淑奇[2] 钟万里[1] 刘志丽[2] 邓平[2] 

机构地区：[1]广东电网公司电力科学研究院,广东广州510080 [2]长沙理工大学能源与动力工程学院,湖南长沙410004

出　　处：《电力科学与技术学报》2014年第1期80-85,共6页Journal of Electric Power Science And Technology

基　　金：南方电网公司科技项目(K-GD2012-379;K-GD2012-388)

摘　　要：基于炉膛内煤粉射流微元段,分析煤粉射流卷吸、挥发分与焦炭燃烧以及辐射传热引起的质量与热量变化,建立煤粉射流中氧质量浓度变化、煤焦颗粒直径变化、煤粉颗粒温度变化及一次风射流温度变化微分方程。在此基础上,提出煤粉射流着火稳定性指标的定量计算方法,对于在实际运行中预测与诊断燃烧状态、优化燃烧、预防熄火具有重要意义。Varying of mass and heat in a pulverized coal j et microsegment of coal-fired boilers caused by entrainment,combustion of volatile matter and coke,and radiation heat transfer was analyzed in this paper.Differential equations of oxygen concentration variation,diameter variation of particle coke,particle temperature variation and gas temperature variation in pulverized coal j et were established.And some new ignition stability indexes for pulverized coal j et and its computa-tional method were put forward.Simulation results showed that the indexes are very useful for j udging and optimizing the stability of the combustion process and preventing flame-out.

关 键 词：煤粉燃烧 燃烧射流 着火模型 着火距离 燃烧稳定性指数 

分 类 号：TK224.2[动力工程及工程热物理—动力机械及工程] TK227.1