Analysis And Treatment Of Tuyere Buckling Damage Which On The 4150m~3 Blast Furnace In Baotou Iron And Steel (Group) Co

Blast furnace ironmaking is an important part of iron and steel production.the tuyere is the key environment to ensure the normal production of blast furnace.Because the tuyere is in a bad environment,the tuyere is often damaged.The problem of tuyere bending failure began to appear six months After the blast furnace is put into production.In serious cases,there were 38 tuyere and only 20 tuyere could spray coal.In 2016,the tuyere replaced by bending failure damage accounted for more than 70%of the total tuyere damage.After the tuyere bending damage,the blast furnace air supply system was seriously affected which restricts the further strengthening of blast furnace smelting.In addition,the direct and indirect economic loss caused by the wind-break replacement tuyere is huge.Therefore,it is urgent to find out the causes of tuyere buckling damage.This paper mainly studies were conducted on abnormal furnace conditions,charging system,air distribution,alkali metal content,and tapping iron to find out the influencing factors of outlet tuyere bending damage loss.By optimizing the charging system,maintaining the proper furnace type,exploring the appropriate blast furnace air supply system,controlling the load of harmful elements,optimizing the size of the tuyere,and intensifying the management of tapping iron,the phenomenon of tuyere bending failure was gradually eliminated.The service life of blast furnace tuyere is lengthened,the blast furnace reached stability and smooth running.In the study of the relationship between tuyere bending failure and The furnace condition stable anterograde.It is found that the abnormal furnace conditions,such as hanging and collapse,are easy to make the charge directly into the hearth,and its gravity action on the tuyere leads to tuyere bending loss.So keeping stable condition is the basis of reducing the tuyere bending failure.Explored the reasonable control range of important parameters,such as Z value range 8-12,W value range 0.8-1.2,the Tf value is between2150℃and 2300℃,the range of blowing energy ranges from 8500 kg to11000kg·m·s^-1,thermal load range（9000-10500）×10MJ·h^-1,theoretical combustion temperature range（2150±100）℃.In the study of the relationship between tuyere bending failure and Charging system.Explore the furnace burden weight and the mode of furnace charge,formulate a reasonable burden distribution matrix,using open the edge airflow way,the abnormal furnace condition is greatly reduced and the operating furnace type is gradually reasonable.In the study of the relationship between tuyere bending failure and basicity of slag.The influence of increasing the proportion of self-produced ore,The influence between tuyere bending failure and on the overall air permeability.It is considered that by adjust structure of ore blending,reducing the amount of harmful elements into the furnace,reduce the basicity of slag below 1.08,and by means of stabilizing central airflow,the influence of harmful elements on furnace condition can be reduced.In the study of the relationship between tuyere bending failure and tapping iron.It is considered that ensuring the depth of the iron notch within a reasonable range can create conditions for good furnace operation.