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一、炉身塌砖经过四号高炉是1970年9月建成投产的。容积2516米~3。它是我国第一座炉腹以上采用汽化冷却、取消炉缸支柱、不设炉腰托圈的大型高炉。1974年2月,因炉身冷却壁大量烧坏进行了第一次中修。1977年10月再次因为炉身汽化冷却出问题进行了第二次中修,将炉身由汽化冷却改为水冷,在沟下增加烧结矿筛分设备。1978年主要经济技术指标达到当时国内大型高炉的先进水平,年平均利用系数为1.526,焦比526.3公斤。1981年2月底炉身砖衬全部脱落,4月份进行了第三次中修。四号高炉开炉以来中修次数、中修炉身寿命及产铁量见表1。由表1可见:
First, the body of the brick collapse After the fourth blast furnace was completed in September 1970 put into operation. Volume of 2516 meters ~ 3. It is the first blast furnace in China with vaporization and cooling, eliminating the support of the hearth, and without the help of a circle of the hearth. February 1974, due to a large number of shaft stave burn out in the first repair. In 1977 October once again because of the body of the gasification and cooling problems in the second repair, the furnace by the gasification cooling to water, in the ditch to increase sinter screening equipment. In 1978 the major economic and technical indicators reached the advanced level of the domestic large blast furnace at an average annual utilization factor of 1.526 and a coke ratio of 526.3 kg. At the end of February 1981 all the body brick lining off, in April for the third time in the repair. Since the fourth blast furnace opened in the number of repair, repair in the shaft life and iron production in Table 1. Can be seen from Table 1: