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某厂动力车间5#蒸汽锅炉于1994年8月投入使用,累积运行58367h。锅炉水冷壁管材质为20#钢;规格为φ60mm×3mm;设计压力3.82MPa,实际最高工作压力3.5MPa;锅炉额定蒸汽温度450℃,实际为430℃。2012年3月初锅炉连续发生水冷壁管泄漏,泄漏水冷壁管位于锅炉人孔对面管排中部,泄漏处位于炉膛底部,对该水冷壁管失效原因进行综合分析:1宏观检验送检试样为一段带圆形泄漏孔的水冷壁管残片,圆孔呈喇叭状,圆孔由内表面向外表面凸起,圆孔周围减薄明显。用肉眼观察水冷壁管外表面,发现水冷
A power plant workshop 5 # steam boiler put into use in August 1994, the cumulative operation of 58367h. The boiler water wall tube material is 20 # steel; the specification is φ60mm × 3mm; the design pressure is 3.82MPa; the actual maximum working pressure is 3.5MPa; the boiler rated steam temperature is 450 ℃ and the actual temperature is 430 ℃. In early March 2012 boiler continuous water wall tube leakage, leak water wall tube is located in the middle of the boiler manhole opposite the row, the leak at the bottom of the furnace, the water wall tube failure causes a comprehensive analysis: 1 macroscopic inspection samples for inspection A section of the water wall tube with a circular leak hole fragments, the horn is trumpet-shaped, circular hole from the inner surface to the outer surface of the bulge, significantly thinning around the circular hole. Observe the outer surface of the water wall tube with the naked eye and found water-cooled