摘要
基于超临界循环流化床锅炉原型风帽,结合冷态试验与数值模拟分析,综合考察了风帽局部阻力分配特性、风帽小孔布置方式、风帽小孔旋转角度和下倾角度对风帽阻力的影响规律。计算结果表明,在风帽局部(芯管、风帽头小孔、缝隙综合区、芯管小孔)阻力分配中,芯管小孔阻力占据了整个风帽阻力的70%以上;芯管小孔的布置方式对风帽阻力的影响不大;风帽阻力随小孔旋转角度的增大而增加,随小孔下倾角度的增加呈先增大后减小的趋势,对比分析可知将小孔旋转30°同时下倾15°是一个较佳的设计。
The cold flow resistance characteristics in an air caps of a supercritical circulation fluidized bed （CFB） boiler were investigated based on CFD simulation combined pressure measurement. The effect of caps geometrical parameters （i.e. the hole arrangement, hole rotation angle and hole downdip angle） on the resistance characteristics were analyzed based on CFD simulation and measurement. The results indicate that more than seventy percent of the resistance is from the small holes of the inner tube among the five local resistances （inner tube, small holes at the head, annular gap, turning position and small holes of the inner tube）. The results also indicate that the effect of the arrangement of holes in the inner tube can be neglected. The resistance decreases with the increase in the hole rotation angle. The effect of hole downdip angle is more complex compared with the rotation angle and the resistance firstly increases and then decreases. Based on above analysis, the best optimized caps design is to down-dip the holes to 15 degrees while rotate which by 30 degrees.
出处
《电站系统工程》
2015年第3期22-24,27,共4页
Power System Engineering
基金
中国科学院战略性先导科技专项(XDA07030100)资助
国家国际科技合作专项(2014DFG61680)资助
关键词
大尺度
内嵌逆流柱型风帽
阻力特性
数值模拟
large-scale
air caps with inner tube and down-flow
resistance characteristics
numerical
