超音速吹灰压力与偏转角对锅炉管束磨损的影响  

Influences of supersonic-sootblowing pressure and rotating angle on tubes erosion in a boiler

作　　者：李相鹏[1] 张超[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）》2014年第3期748-754,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CFD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,研究吹灰器喷口轴线与管排壁面相切时吹灰压力及喷管偏转角度的影响。采用文献试验结果对CFD模型进行验证。结果表明:当压力从0.6 MPa增至1.6 MPa时,射流出口速度、飞灰颗粒与管壁面的平均碰撞速度和频率均有不同程度增大,管壁最大磨损率增大1.88倍。而当吹灰角度从0°增至60°时,射流出口速度、飞灰颗粒与管壁面的平均碰撞速度和频率均有所减小,锅炉管壁面的最大磨损率减小近57倍,磨损范围变大。Computational fluid dynamic （CFD） method and classical wear prediction model were applied to simulate the gas-solid two-phase flow fields and boiler-tube erosion induced by supersonic sootblowing process. The influences of soothlowing pressure and nozzle rotating angle were studied in detail in the cases when the axis of nozzle was tangent to the tube bundle＇s surface. The CFD model was validated by the experimental results reported in literatures. According to the results, when the pressure increases from 0.6 to 1.6 MPa, the jet velocity, average particle-impacting velocity and frequency increase in varying degrees, and the maximum wear rate of boiler tubes increases by about 1.88 times. As the nozzle rotating angle increases from 0° to 60°, the jet velocity, and impacting velocity, frequency of the fly-ash particles decrease remarkably, the maximum wear rate of boiler tubes deceases by almost 57 times, with an increased wearing area.

关 键 词：数值模拟 磨损速率 气固两相流 超音速射流 吹灰 

分 类 号：TK223.3[动力工程及工程热物理—动力机械及工程]