锅炉转向室烟气调节屏的调节性能与优化设计  

Regulation performance and optimal design of the gas adjust-screen in boiler steering rooms

作　　者：雷贤良[1] 李会雄[1] 张庆[1] 王太[1] 

机构地区：[1]西安交通大学多相流国家重点实验室,陕西西安710049

出　　处：《华中科技大学学报（自然科学版）》2011年第10期128-132,共5页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家重点基础研究发展计划资助项目(2009CB219805)

摘　　要：为解决锅炉尾部烟道中烟气气流分布不均匀性问题,在锅炉转向室内增设烟气调节屏,并通过数值计算和采用粒子图像测速仪(PIV)测量的方法对烟气调节屏的调节性能进行优化.在锅炉转向室内优化设计出3种不同的烟气调节屏装置,并引用不均匀系数和速度偏差系数定量评定烟道内流场的均匀性,结果显示增设烟气调节装置后气流场均匀程度明显变优.特别是采用具有强消旋减涡作用及安装简易特点的竖直布置弧形调节屏,左右两侧气流分布不均匀系数由3.18和1.68分别降至1.97和1.59,速度偏差比接近于1.0.利用PIV对优化后的调节屏进行测试验证,结果表明优化后的调节屏能较好地改善尾部烟道内气流的分布特性.Numerical simulation and particle image velocimetry（PIV） were used to solve the uneven distribution of the flue gas flow in the rear flue.Three type of gas adjust-screen were designed and two assessment indicators,non-uniform coefficient and velocity deviation,were introduced to describe the quantitative assessment of the flue gas flow field uniformity.Variation of two-parameter were observed before and after joining adjustment screen to the flow field.It is shown that the distribution of flow field get better,especially the vertical layout and arc shaped adjust-screen after integration and optimization,the non-uniform coefficient decreased from 3.18 to 1.97 in the left flue,and the coefficient decreased from 1.68 to 1.57 in the right flue,the velocity deviation changed to approximately 1.0.The effect of the optimized regulation of screen was tested by PIV.The results indicate that the optimized regulation screen can improve the gas distribution inside of the flue better and be used in engineering practices.

关 键 词：锅炉 烟气 数值计算 转向室 调节屏 粒子图像测速仪 

分 类 号：TK124[动力工程及工程热物理—工程热物理]