Lump coal used for COREX and a new method for detecting lump coal's pyrolysis characteristics

摘要

The COREX process is a unique industrialized smelting reduction technology for iron-making presently in the world.One of its striking characteristics is its ability to directly utilize lump coal as its main fuel.Therefore,the COREX process uses little,or no coke at all.The requirements on lump coal for the COREX process were given in this paper.In order to reduce the coke consumption and give play to the advantages of directly using lump coal,the appropriate ratio of coke to lump coal needs to be determined.This paper also summerized several advanced methods of using powdered coal generated by the transporting,loading and unloading of lump coal.In order to solve the lack of coal types for COREX and observe the cracking and devolatilization action of lump coal in the melter-gasifier,an experimental device and a new method were proposed to test the cracking and devolatilization characteristics of lump coal.By means of the new method, the devolatilization and cracking behaviors of lump coal can be investigated,which is helpful to the selection of lump coal for the COREX process.