内嵌逆流柱型风帽阻力特性冷态试验研究  

Experimental Study on Resistance Characteristics of Internal Counterflow Wind Caps with Inner Tubes

作　　者：范金龙[1,2] 宋国良[1] 宋维健[1,2] 孙运凯[1] 

机构地区：[1]中国科学院工程热物理研究所,北京100190 [2]中国科学院大学,北京100049

出　　处：《动力工程学报》2015年第7期531-536,共6页Journal of Chinese Society of Power Engineering

基　　金：中国科学院战略性先导科技专项资助项目(XDA07030100);国家国际科技合作专项资助项目(2014DFG61680)

摘　　要：基于660 MW循环流化床(CFB)锅炉原型风帽,结合冷态试验与理论分析,研究了内嵌逆流柱型风帽的结构尺度、风帽局部阻力分配特性、背压及多风帽布置方式对风帽阻力的影响.基于大量试验数据,结合Levenberg-Marquardt(LM)算法和通用全局优化算法,获得了风帽阻力计算模型.结果表明:风帽阻力除了与风速有关外,还与风帽的结构尺度有关;在风帽局部(如芯管、风帽头小孔、环缝、折转处和芯管小孔)阻力分配中,芯管小孔风速的影响最为显著;风帽阻力随着背压的升高呈单调减小趋势,多风帽布置方式对其阻力的影响不明显;通过该模型计算得到的风帽阻力计算值与试验值基本吻合.Based on actual wind caps of a 660 MW circulating fluidized bed （CFB） boiler, theoretical analy- sis and cold-state experiments were conducted to the internal counterflow wind caps with inner tubes, so as to study the effects of following factors on the resistance characteristics, such as the structure size, local resistance, back pressure and arrangement of multi-wind caps, etc. , after which a calculation model was obtained for the resistance of wind caps based on a great deal of test data using Levenberg-Marquardt （LM） algorithm and universal global optimization. Results show that the resistance of wind caps is related to both the wind velocity and the structure size, and among all the 5 locations （inner tube, small holes at the head, annular gap, turning position and small holes on inner tube）, the resistance from small holes on inner tube plays the most important role. The resistance of wind cap reduces with the rise of back pres- sure, which is slightly affected by the arrangement of multi-wind caps. The results of wind cap resistance calculated with the model proposed agree well with experimental data.

关 键 词：循环流化床锅炉 内嵌逆流柱型风帽 阻力特性 计算模型 

分 类 号：TK229.2[动力工程及工程热物理—动力机械及工程]