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1991年10月11日,湖南大庸市某宾馆一台KZG0.5 0.7型锅炉在运行过程中,锅筒底部发生鼓疱,疱长300mm,宽2000mm,峰高50mm,疱呈椭园形。停炉后,开炉检查,发现锅筒底部沉积的垢片、泥渣厚度达250mm,经有关部门检测,认定锅筒底部局部过烧,金属材质发生变化,无修理价值,锅炉报废,直接经济损失达3万余元。此锅炉自1986年安装使用以来,由于水处理工作做得不好,锅筒内积成水垢较厚。1991年8月5日,市锅炉安全监察部门检查后,提出进行一次酸洗除垢。8月10日该单位请无证的锅炉化学清洗队,进行酸洗除垢。酸洗后,由于脱落的垢片将排污管堵塞,清洗队没有疏通排污管,而采用左右联箱排液清洗,使大量的泥渣未排出。据了解,清洗队不知道锅炉前管板下方有一
October 11, 1991, a hotel in Dayong, Hunan, a KZG0.5 0.7 boiler in operation, the drum at the bottom of the blister blister, blister length 300mm, width 2000mm, peak height 50mm blisters were elliptical. After shutdown, open the furnace inspection and found that the bottom of the drum sediment scale, sludge thickness of 250mm, the relevant departments detected that the bottom of the drum partial burning, the metal material changes, no repair value, scrap the boiler, the direct economy Loss of 3 million yuan. Since the boiler was installed and used in 1986, due to poor water treatment work, the product is thicker in the drum. August 5, 1991, the municipal boiler safety inspection department, proposed a pickling descaling. August 10 The unit without a certificate of the boiler chemical cleaning team, pickling descaling. After pickling, due to the scale sheet will fall off the sewage pipes, cleaning team did not clear the sewage pipe, and the use of about the tank drain cleaning, so that a large number of sludge is not discharged. It is understood that the cleaning team did not know the bottom of the boiler tube plate below one