Study Of Numerical Simulation For Shaft Limekiln

The lime is an important raw material in steel-making. It is an unavoidable trend that the active lime will replace in general quicklime the process of metallurgy. It brings forward higher demands with the development of steel-making's technology for desulphurization. It also puts forward more requirements for the lime to improve the sinter's qualities with the development of ironmaking material's clinker aggregate. The lime's production looks the most important in order to meet the lime's quality for iron and steel industry. So the lime's production process, the technological process's design and manufacturing facility should focus on improving the lime's qualities for iron and steel's production.The blending shaft lime-kiln's investment and production cost are lower, and its production is easier than other limekilns, so it takes a large proportion in producing the metallurgy lime. But its deadly shortage is that the activity of lime is not high. A 2D mathematical model is used to study lime-shaft-kiln in order to enhance the product efficiency and the lime's reactive characteristic of these kilns.In this paper, by applying theκ-εdouble equation model and the char combustion model, a 2D-numerical simulation is carried out to simulate the results of the gas flow field, temperature distribution of gas and solid burden and the distribution of carbon, oxygen and carbon dioxide in the shaft lime-kiln. It shows that the low product efficiency and reactive characteristic result from the irrational distribution of gas flow field in the shaft limekiln. The irrationality of gas flow field also reveals the deficiencies in the blast-cap construction. According to this problem, the distribution of gas flow field in the kiln is greatly improved by poring on the top of blast cap. In this paper, a direction of modifying blast cap is pointed out, which provides a theoretical base for reforming shaft limekiln.