超音速吹灰及其引起的锅炉管束磨损模拟分析  

Simulation analysis of tubes erosion induced by supersonic soot blowing in boiler

作　　者：李相鹏[1] 汪蓉梅[1] 蓝立伟[1] 

机构地区：[1]浙江工业大学机械工程学院,浙江杭州310032

出　　处：《中南大学学报（自然科学版）》2013年第8期3179-3185,共7页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(20876146)

摘　　要：采用数值模拟方法和经典磨损模型对超音速吹灰过程气固两相流分布及其引起的锅炉管束磨损进行模拟分析,研究喷口与管排相对位置的影响。并采用文献试验结果对数值模型进行验证。模拟结果表明:在研究吹灰压力条件下,喷口气流马赫数达到1.6,接近管排处,最大射流速度达到283.91 m/s以上。颗粒的平均碰撞速度和平均碰撞角度随喷口轴线与管排距离的减小而增大。颗粒碰撞频率在射流与管排相切(c位置)吹扫时最大。相切吹扫时造成管排的磨损速率也最大,最大值比其余4个位置吹扫时大2.74倍以上,当喷口轴线与管排不相交(d和e位置)吹扫时,磨损速率明显减小。The influences of different jet positions in 600 MW boiler were simulated and analyzed using Classical wear model with numerical simulation method. The results show that the nozzle Mach is 1.6 in jet pressure, the jet speed is more than 283.91 m/s close to the nozzle. The average impact velocity, and angle of impact particle is increase when the distance of the axis line of nozzle with the tube decreases. When the axis line of nozzle is tangent to tube （position c） the number of impact particle is most. And the speed of erosion is also the most as the axis line of nozzle is tangent to tube, the maximum value is more 2.74 times than the one in the other four positions. When the axis line of nozzle and the tube do not intersect （position d, e）, the speed of erosion reduces quickly.

关 键 词：吹灰 磨损 气固两相流 超音速射流 

分 类 号：TK223.3[动力工程及工程热物理—动力机械及工程]