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我厂4#炉系BG75/38-450-Ⅱ煤粉锅炉,其主蒸汽管道规格φ219mm×9mm,材质为20号钢。2003年5月1日发生爆裂。现场检查发现爆管位置在集汽联箱电动主汽门出口1200mm弯头处。爆管破口较大,且不规则,破口边缘钝,厚边有减薄。背弧主裂纹纵向长610mm,横向宽145mm,管壁最薄处6mm,内壁冲刷出沟,腐蚀出坑,在断口边缘处无发现有与主裂口方向垂直和平行的细小裂纹。直管段直径明显胀粗。爆裂瞬间锅炉负荷83t/h、压力3.9MPa、温度457℃。 1 使用情况 1) 该炉1984年安装投产,主汽管道为厂家原配。
I plant 4 # furnace BG75 / 38-450-Ⅱ pulverized coal boilers, the main steam pipe specifications φ219mm × 9mm, made of 20 steel. May 1, 2003 burst. Field inspection found that the location of the squib in the steam header outlet main steam valve outlet 1200mm Department. Rupture tube burst larger, and irregular, broken edges blunt, thick edge thinning. The length of the main crack in the back arc is 610 mm in length and 145 mm in width. The thinnest wall of the back wall is 6 mm. The inner wall is washed out of the groove to erode the pit. No small cracks are found perpendicular to and parallel to the direction of the main tear at the edge of the fracture. Straight section diameter was significantly expanded. Burst moment boiler load 83t / h, pressure 3.9MPa, temperature 457 ℃. 1 Use 1) The furnace was put into operation in 1984, the main steam pipe factory for the first wife.