摘要
针对冶金行业蒸汽干燥机内部盘管冲蚀磨损问题,使用超音速喷涂工艺制备碳化钨涂层盘管提高盘管的使用寿命。通过显微金相检测与拉伸试验获取盘管表面状况与结合强度。基于FLUENT建立了计入壁面硬度实验值的盘管冲蚀模型,通过仿真云图与现场磨损图片进行比对,验证了数值仿真模型的合理性与真实性。将模型与冲蚀率做统一量纲化处理后,对盘管冲蚀磨损寿命进行预测。结果表明,超音速喷涂备至涂层盘管金相观测孔隙率小于0.1%,厚度大于90 um,表面硬度大于1000 HV,结合强度大于70 MPa,喷涂工艺可靠性较好;仿真结果表明,盘管冲蚀率在35°入射角附近达到最大,最大值为1.92×10^(-7) kg/(m^(2)·s);冲蚀率预测盘管极限工况使用寿命达36718750 s,较喷涂前提高约145%~167%;预测正常工况寿命41592920 s,较喷涂前提高约154%~177%。
In order to improve the service life of steam dryer coils,WC coated coils were prepared by supersonic spraying technology.To obtain the surface condition and bonding strength of the coil,the micrographic detection and tensile test were carried out.To predict the service life of WC coated coil,a coil erosion model was established by FLUENT which included the test value of wall hardness.We compared the cloud map with the field wear picture.It is found that the higher part of simulation results is consistent with the wear part in the field.This phenomenon shows the rationality and authenticity of the simulation model.After unified dimensional treatment of the calculated erosion rate and the model,the erosion wear life of the coil is predicted.The results show that the observed porosity of the coated coil is less than 0.1%,the thickness is greater than 90 um,and the surface hardness is greater than 1000 HV.This shows that the coil spraying process of supersonic spraying has good reliability.The simulation results show that when the coil works in practice,the erosion rate reaches the maximum near the incident Angle of 35°and the maximum value is 1.92×10^(-7) kg/(m^(2)·s).According to the erosion rate,the service life of coil in the ultimate working condition is predicted to reach 36718750 s,which is about 145%-167% higher than that before spraying.The predicted life under normal condition is 41592920 s,which is about 154%-177% higher than that before spraying.
作者
张素忠
马运昌
万祺
孟延
孙嵩松
张文强
Zhang Suzhong;Ma Yunchang;Wan Qi;Meng Yan;Sun Songsong;Zhang Wenqiang(Aerosun Corporation,Nanjing,Jiangsu 210000,China;Nanjing Forestry University School of Automotive and Traffic Engineering,Nanjing,Jiangsu 210000,China;Tongling Nonferrous Metals Group Co.,Ltd.,Tongling,Anhui 244000,China)
出处
《化工设备与管道》
CAS
北大核心
2024年第3期45-53,共9页
Process Equipment & Piping
基金
江苏省高校自然科学基金资助项目(18KJB460019)渗氮工艺对汽车疲劳机理影响研究。
关键词
蒸汽干燥机
盘管
冲蚀磨损
碳化钨涂层
超音速喷涂
寿命预测
steam dryer
coil tube
erosion wear
tungsten carbide coating
supersonic spraying
life prediction
