GHH烟气轮机叶片断裂分析

对GHH烟气轮机断裂叶片的宏观检查、断口分析和叶片受力分析计算表明 ,烟机叶片断裂属疲劳断裂 ,断裂部位距叶根高 15mm ,此处正是叶片计算合成应力最大的位置。影响叶片断裂的因素除断裂力学理论的裂纹生成和扩展外 ,还与烟气中粉尘的浓度、粉尘颗粒尺寸和粉尘速度有关。为提高叶片使用寿命 ,采取控制进入烟机烟气温度、压力和流量的措施 ,使烟气中催化剂粉尘浓度小于 2 0 0mg/m3、粒径大于 10 μm的粒子小于 8% ,现烟机已安全平稳运行 60 0d ,取得显著效果

Analysis of fracture of vanes on GHH flue gas turbine

Based on macro check of the fractured vanes of GHH flue gas turbine,fracture analysis and vane force analysis,it is confirmed that the fracture of the vane is fatigue fracture.The fractured location is 15mm far awayfrom the vane's root,where is area with the maximal resultant stress.The fracture of the vane is relative not only to the forming and extension of cracks,but also to the density,particle size and moving speed of dusts in the flue gas.To improve the service life of the vane,measures are adopted to make the concentration of catalyze dusts lower than 200mg/m 3 and particles with over 10μm diameter less than 8%,by controlling the temperature and pressure and flow of the flue gas entering the turbing.Up till now,the flue gas turbine has run smoothly and safely for 600 days.fluegast