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1981年初,由于四号高炉(容积2516米~3)炉身砖衬全部脱落,无法继续正常生产,决定提前进行第三次中修,因该炉刚小修仅四个月,大小钟都是新换的,故这次中修是被迫进行的非计划检修,大小钟均无备品.因此,要求停炉一定要保护好大小钟及炉顶设备,炉顶温度不高于400℃,停炉过程中也不能由炉顶打水控制炉顶温度,以防大钟受激冷变形.采用高料线全焦(中块焦)停炉可以保护大钟,但扒炉工作量太大,影响检修工期.为此,我们采用了国外资料介绍的砾石停炉法.
In early 1981, due to the fourth blast furnace (volume of 2516 m ~ 3) full of brick body lining off, can not continue normal production, decided to advance to the third in the repair, the furnace just a minor repair only four months, the size of the clock are new For this reason, this time in the repair is forced to carry out unplanned maintenance, the size of the clock are not spare .Therefore, the request to stop the furnace must be good to protect the size of the bell and roof equipment, the top temperature is not higher than 400 ℃, shutdown During the process, the temperature of the top of the furnace can not be controlled by the water from the top of the furnace to prevent the big clock from being affected by the cold deformation. Overhaul period.To this end, we adopted the gravel shutdown method introduced by foreign materials.