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萍乡钢铁厂301号高炉自1984年7月投产至1988年6月停炉,四年间曾一度风口烧损频繁,高炉不接受风量,无法强化冶炼.为减少风口烧损,曾试用锰矿洗炉以及使用A1_2O_3喷涂风口,在下部采取缩小风口,试图打透中心,然而效果甚微.1987年2月,通过分析,认识到风口大量烧损的根源在于炉缸工作不活,而造成炉缸不活跃关键又在于风口选择不合理.就是说,以往高炉风口截面积偏小,冶炼强度低,炉缸中心不透,炉况稳定性差,操作上又长期发展边缘,加重炉缸不活性,致使风口烧损频繁(见表1).
Pingxiang Iron and Steel Plant blast furnace No. 301 since its commissioning in July 1984 to June 1988 shutdown, once in four years once the tuyere burned frequently, the blast furnace does not accept the air volume, can not be strengthened smelting. In order to reduce the tuyere burned, have tried manganese furnace and The use of A1_2O_3 spray tuyere, to reduce the outlet in the lower part, trying to break through the center, but little effect.In 1987 February, through analysis, to understand the root of the tuyere burning is in the hearth is not working, which caused the hearth is not active The key lies in the tuyere selection is unreasonable.That is, in the past blast furnace tuyere cross-sectional area is small, smelting strength is low, the hearth hearth, poor stability of the furnace, the operation and the long-term development of the edge, increase the hearth inactivity, resulting in tuyere Loss of frequent (see Table 1).