燃尽风对四角切圆锅炉烟温偏差影响的数值模拟  

Numerical Simulation of OFA Impact on Flue Gas Temperature Deviation of a Tangential Boiler

作　　者：钱琳 吴奎 薛金凯 朱宣而 QIAN Lin;WU Kui;XUE Jinkai;ZHU Xuan'er(School of Electrical and Power Engineering,China University of Mining and Technology,Xuzhou 221116,China)

机构地区：[1]中国矿业大学电气与动力工程学院,江苏徐州221116

出　　处：《锅炉技术》2022年第1期43-47,62,共6页Boiler Technology

基　　金：中央高校基本科研业务费专项资金(2015QNA12)。

摘　　要：对某电站四角切圆煤粉锅炉进行燃烧特性的数值模拟。炉膛出口存在烟温偏差,采用OFA(燃尽风)联合三次风反切的方法,减小炉膛出口烟温偏差。分析了4种不同反切角度对炉膛出口烟温偏差的影响。结果表明:OFA和三次风在适当的角度下进行反切对主燃区的影响较小,但过度增大反切角度会使主燃区燃烧紊乱,增大炉膛出口的烟温偏差;OFA联合三次风反切20°时,对水平烟道温度偏差的改善最优,且不会对主燃区燃烧产生负面影响,为最合理的工况。The combustion characteristics of a tangentially fired boiler was simulated. There is flue gas temperature deviation at the furnace exit. The method of combining overfire air(OFA) and tertiary air with yaw angle is used to reduce the flue gas temperature deviation at the furnace exit. The influence of four different yaw angles on flue gas temperature deviation at furnace exit was analysed. The results show that OFA and tertiary air have little influence on the main combustion zone when the yaw angle is appropriate, but excessive increase yaw angle will cause combustion disorder in the main combustion zone and increase the flue gas temperature deviation at the furnace exit. The temperature deviation at the horizontal flue can be minimized when OFA and tertiary air with the yaw angle at 20°, and the combustion in the main combustion zone will not be adversely affected, which is the most reasonable condition.

关 键 词：四角切圆锅炉 烟温偏差 OFA 反切角度 数值模拟 

分 类 号：TK227.1[动力工程及工程热物理—动力机械及工程]