For increasing the resistance to wear and sealing property between bell and hopper of blast furnace the method overlaid welding a lay of TDGC-1 hard alloy on the matching surface of bell and hopper is used.

Big bell rod happens to fracture accident in No 2 blast furnace of Weihai ironmaking works Through analyzing,it is discovered that the main causes of happening accident are weak equipment management,no attention some abnormal phenomena and no adopting reasonable steps before accident appearance This paper puts forward some effective countermeasures based on the analyzin

Techno-economic indicators such as coke ratio equivalent and utilization factor have been improved based on finding charge rules of bell-less BF top, optimizing operating and adjusting tuyere layout.

1 BF come across in production are analysed and solved through combining theory with practice and application on mathematical model of bell-less burden distribution in BF.

In this paper,according to the effect factors and character of burden distribution for bell-less BF the originel distribution of burden after burder distribution has been simulated by using the burden distribution mathematical model for bell-less BF.

By combining theory with practice, the rule of charge distribution at bell less top on No 1 BF has been studied Because of flexible and right charge adjustment methods, the operation became smooth and the remarkable benefit has been gaine

Through the analysis and consideration of effect factors and characters in burden distribution of bell less BF,mathematical model for burden distribution of bell less BF is established based on predecessors achievements and computer technology.