论文部分内容阅读
某铝厂自备发电机组运行人员发现受热面泄漏迹象,停炉检查发现在后墙水冷壁二级混合器下方约lm有两处泄漏。1设备概况该锅炉为双炉膛n型布置、四角切圆燃烧、亚临界压力中间再热直流锅炉,水冷壁采用一次上升、中间三次混合分配,用联箱加隔板的方法,将24片管屏分成48个回路,后墙水冷壁泄漏区烟气温度为1 500℃,为防止膜态沸腾,设计材料为20A、规格φ22×5.5mm的内螺纹鳍片管,管内介质设计温度为367℃,工作压力为20.38MPa。截止此次停炉检查,锅炉累计运行16.1万h,机组启停近400次。2宏观检查
An aluminum plant owned generator found signs of heating surface leakage, shutdown inspection found in the back wall of the water wall under the mixer two lm about two leaks. 1 Equipment Overview The boiler is a double furnace n-type layout, tangential burning four corners, sub-critical pressure reheat reheat boiler, the water wall with a rise in the middle of the three mixed distribution, with the addition of bulkhead method, the 24 tubes The screen is divided into 48 loops, and the flue gas temperature in the leakage zone of the water wall of the back wall is 1 500 ℃. In order to prevent the film from boiling, the designed material is 20A, the inner diameter of which is φ22 × 5.5mm, fin tube design temperature is 367 ℃ , Working pressure is 20.38MPa. As of this shutdown inspection, the boiler has been running 161,000 h, the unit start and stop nearly 400 times. 2 macro inspection