吕玉坤,杨帆,卢权

• 1:华北电力大学动力工程系
• 2:国华三河发电有限责任公司

摘要(Abstract)：

为探寻管座内壁磨损致穿孔泄漏原因，以某300 MW机组主蒸汽温度测点管座为研究对象，模拟分析了其内部的三维流动特征。结果表明：主蒸汽由间隙进入管座后形成大尺度轴向螺旋流，并以较高频率（7～40 Hz）冲刷管座内壁面；当保护套管的棱锥体安装角为60°时，管座近壁区周向冲刷速度可达8 m/s，约为0°安装角时的2倍；弯管与直管上3号测点管座内部流体总压差值最高可达约6 500 Pa，表明弯管二次流可为管座内轴向螺旋流提供更高能量；气流螺旋偏角较大区域易形成轴状旋涡，致使局部气流冲刷频率加快。为此，提出了在管座内加装直肋片的结构改进方案，模拟结果表明该方案可有效改变管座内气流原有的螺旋运动方式，周向冲刷速度降幅超过90%，有利于大幅度削弱管座内壁面损伤。

关键词(KeyWords)： 管座;壁面磨损;气流冲刷;螺旋流;涡形态;数值模拟

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 吕玉坤,杨帆,卢权

DOI: 10.19666/j.rlfd.202108148

参考文献(References)：

• [1]宋琳生.电厂金属材料[M].北京:中国电力出版社,2013:142-158.SONG Linsheng.Power plant metal material[M].Beijing:China Electric Power Press,2013:142-158.
• [2]徐超.火电厂锅炉四管防磨防爆及预防泄漏措施分析[C]//2020年江西省电机工程学会年会论文集.2021:2.XU Chao.Analysis on anti-wear and explosion-proof measures and leakage prevention measures of boiler four pipes in thermal power plant[C]//Paper Collection of Annual Meeting of Jiangxi Electric Machinery Engineering Society in 2020.2021:2.
• [3]葛闯,钟文琪,周冠文,等.电站煤粉锅炉分隔屏过热器磨损特性数值试验研究及运行优化[J].中国电机工程学报,2021,41(23):8057-8067.GE Chuang,ZHONG Wenqi,ZHOU Guanwen,et al.Numerical experimental study and operation optimization on wear chara-cteristics of division panel superheater of pulverized-coal boilers[J].Proceedings of the CSEE,2021,41(23):8057-8067.
• [4]赵宪萍,叶桂林,孙坚荣.电厂飞灰颗粒粒径对冲蚀磨损性能影响的试验研究[J].上海电力学院学报,2018,34(2):101-105.ZHAO Xianping,YE Guilin,SUN Jianrong.Experimental study on the influence of flying-ash erosion characteristic with the particle size[J].Journal of Shanghai University of Electric Power,2018,34(2):101-105.
• [5]CAO L H,TU C Y,HU P F,et al.Influence of solid particle erosion (SPE) on safety and economy of steam turbines[J].Applied Thermal Engineering,2019,150:552-563.
• [6]叶学民,张丹,李春曦.动叶可调轴流风机叶片磨损对其性能的影响[J].动力工程学报,2017,37(4):285-292.YE Xuemin,ZHANG Dan,LI Chunxi.Effects of blade erosion on performance degradation of a variable-pitch axial flow fan[J].Journal of Chinese Society of Power Engineering,2017,37(4):285-292.
• [7]PATANKAR S V,PRATAP V S,SPALDING D B.Prediction of turbulent flow in curved pipes[J].Journal of Fluid Mechanics,2006,67(3):583-595.
• [8]ZHANG P S,ROBERTS R M,ANDRE B.Numerical simulation of turbulent mist flows with liquid film formation in curved pipes using an Eulerian-Eulerian method[J].Journal of Fluids Engineering,2013,135(9):1-10.
• [9]SHIH T H,ZHU J,LUMLEY J L,et al.A new Reynolds stress algebraic equation model[J].Computer Methods in Applied Mechanics and Engineering,1995,125(1/2/3/4):287-302.
• [10]WANG Q C,HUANG Q Y,SUN X,et al.Transient large eddy simulation of slurry erosion in submerged impinging jets[J].Journal of Energy Resources TechnologyTransactions of the ASME,2021,143(6):62-107.
• [11]吴介之,杨越.关于旋涡定义的思考[J].空气动力学学报,2020,38(1):1-8.WU Jiezhi,YANG Yue.Thoughts on vortex definition[J].Acta Areodynamica Sinica,2020,38(1):1-8.
• [12]TAYLOR G I.Stability of a viscous liquid contained between two rotating cylinders[J].Philosophical Transactions of the Royal Society of London,1923,102:289-343.
• [13]吴介之.涡动力学引论[M].北京:高等教育出版社,1993:541-576.WU Jiezhi.Introduction to vorticity and vortex dynamics[M].Beijing:Higher Education Press,1993:541-576.