Method for quantitative stock level-lowering and blowing out of blast furnace

Abstract

The invention discloses a method for quantitative stock level-lowering and blowing out of a blast furnace and belongs to the technical field of blast furnace iron making. The process of blowing out comprises a normal material stage and a coke stage; the normal material stage further comprises an early period and a later period during which normal materials are in the furnace; the coke stage further comprises an early period during which there is only coke in the furnace and the stock level is at the lower part of the furnace stack, a middle period during which there is only coke in the furnace and the stock level is at the furnace belly, a later period during which there is only coke in the furnace and the stock level is at the upper part of the furnace bosh or the furnace crucible, so that key tasks and quantitative principles at stages of the process of stock level-lowering and blowing out can be made clear. The method is to focus on initiative control over air quantities at different stock level-lowering stages and also give consideration to specific conditions for the stock level-lowering and blowing out of the blast furnace so as to quantify the stock level-lowering and blowing-out technology and detail all the parameters in the stock level-lowering and blowing out processes. Practice proves that the actual parameters in the stock level-lowering and blowing out processes are as planed and the stock level-lowering process is safe, efficient and environmentally-friendly.

Description

technical field [0001] The invention belongs to the technical field of blast furnace ironmaking, and in particular relates to a method for stopping a blast furnace by quantitatively reducing the material surface. Background technique [0002] Shougang's No. 1 and No. 3 blast furnaces were opened in August 1994 and June 1993 respectively. As of July 2009, the iron production per unit volume of the blast furnaces reached 12,126 tons and 12,826 tons respectively, which are close to the international advanced level. With the increase of the age of the two blast furnaces, the cooling staves of the furnace body were damaged to varying degrees. In order to slow down the damage of the cooling walls of the furnace body, the two blast furnaces were sprayed and lined regularly. The randomness and human nature of material surface operation lead to large parameter changes, frequent knocking, fire at the furnace roof relief valve, and long time for gas release during each operation of mat...

AI Technical Summary

Problems solved by technology

With the increase of the age of the two blast furnaces, the cooling staves of the furnace body were damaged to varying degrees. In order to slow down the damage of the cooling walls of the furnace body, the two blast furnaces were sprayed and lined regularly. The randomness and human nature of material surface operation lead to large parameter changes, frequent knocking, fire at the furnace roof relief valve, and long time for gas release during each operation of material level lowering, which seriously threatens the shutdown of the furnace at the material level. Process safety, efficiency and environmental protection

With the requirements for the longevity of blast furnaces, more and more blast furnaces are shutting down on the lowering surface in China. Judging from the shutdown process of this part of the blast furnace, they generally face the same problem. The shutdown process on the lowering surface The arbitrariness of the process leads to waste of resources, pollution to the environment, damage to equipment, and a serious threat to the safety of the blast furnace

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