Research On Spraying Technology Of Jiugang Steel Blast Furnace

High efficiency,long life,low consumption and high production of blast furnace are the goal of iron and steel enterprises.It costs up to 100 million yuan to build a new large blast furnace or rebuild a large blast furnace,so the service life of blast furnace is directly related to the economic benefits of iron and steel enterprises.With the progress of iron and steel industry technology in the world,the long life technology of blast furnace has made remarkable achievements.The life of blast furnace in developed countries can generally reach 10-15 years,and some can even reach 20 years.Comparatively speaking,there is a certain gap between the longevity level of blast furnace in China and the advanced level in foreign countries.The research on high efficiency and long life technology of blast furnace in Jiuquan Iron and Steel Co.is not in an advantageous position in China.How to take effective measures to prolong the service life of blast furnace and make the blast furnace run efficiently is a subject that relevant researchers must study.High efficiency and long life is an important goal of blast furnace ironmaking.There are many factors affecting the high efficiency and long life of blast furnace.Reasonable furnace design,high quality construction,fine operation and maintenance are the basic guarantee of high efficiency and long life of blast furnace.By means of hot gunning during planned maintenance,it can also effectively slow down the erosion of blast furnace lining,maintain a reasonable furnace type,and promote the operation of blast furnace with high quality,low consumption,high yield and long life.On the basis of learning a lot of advanced experience of gunning at home and abroad,the gunning process and related technical parameters of No.Through the research,it is found that the main problem of gunning in Jiuquan Iron and Steel Co.Ltd.is the lack of preplan before gunning and the inaccuracy of the main parameters affecting the gunning effect.The technical scheme of blast furnace gunning at Jiuquan Iron and Steel Co.The reasonable injection pressure should be controlled at 0.6MPa,and the average injection speed should be controlled at 7T/h.According to the gunning effect of blast furnace,the gunning effect of 72%A12O3 is better.According to the main problems existing in the gunning technology of Jiuquan Iron and Steel Co.,Ltd.,the paper puts forward the effective measures for gunning:(1)different materials are selected according to the damage characteristics of the cooling staves in various parts of the blast furnace,such as high-strength and high wear-resistant gunning materials selected for the upper part of the furnace shaft;ordinary gunning materials are selected for the middle and lower part of the furnace shaft,the waist and the bosh considering the damage reasons of the cooling staves.(2)determine the gunning materials of each section.(3)comprehensively and carefully check the preparation operations that affect the effect of gunning operation.(4)ensure the implementation process is scientific and safe.