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我市某乡木器厂的DZG2-7型锅炉发生一起严重缺水事故,该锅炉于1987年底安装,主要用于木材的烘干和热压。同年5月9日下午3时,运行中发现锅筒大面积凸起变形,经停炉检查发现炉左侧水位计汽、水连管旋塞均处于关闭状态,右侧水位计汽、水连管启闭正常。经解体检查,右侧水位计水连管内泥垢很多,石棉垫安装位置严重偏移,水连管通道面积很小。主汽阀关闭不严,和另一台运行炉互相串汽。炉内水垢平均3mm左右,锅筒底部水垢堆积约30kg。炉膛内烟道出口右侧砌死,左侧可通。经现场检测,筒体设计壁厚为12mm,凸起部位壁厚为10.9mm;筒体未受热部分硬度为HB173,凸起部分为HB115;管板下部长杆拉撑右侧向上挠曲60mm,左侧向上挠曲50mm。筒体底部从筒内拉线检查,中心部位下凹53mm,左侧45°区域下凹55mm,
A severe water shortage occurred in a DZG2-7 boiler in a wooden factory in our city. The boiler was installed at the end of 1987 and mainly used for drying and pressing wood. In the same year at 9:00 on May 9 at 3 o’clock, the operation found that the large deformation of the drum large deformation, the furnace shutdown found that the left side of the water level gauge steam, water pipe cocks are closed, the right water gauge steam, water pipe Normal opening and closing. After the disintegration inspection, the right side of the water level gauge water pipe a lot of dirt, asbestos cushion installation position of a serious shift, water pipe channel area is small. Main steam valve closed lax, and another run furnace string steam with each other. An average of about 3mm furnace scale, drum bottom scale accumulation of about 30kg. Flue outlet on the right side of the furnace died, the left can be. After the field test, the designed cylinder wall thickness is 12mm, the wall thickness of the convex part is 10.9mm; the hardness of the unheated part of the cylinder is HB173 and the convex part is HB115; the right side of the lower pole of the tube plate is bent upward by 60mm, Flexing the left side up 50mm. At the bottom of the barrel, a pull-in inspection was carried out from the barrel, with a center concave of 53 mm and a concave of 55 mm in the left 45 ° area,