2014 Volume 100 Issue 2 Pages 110-117
Coking coal necessary for cokemaking process is exhausted in progress; increasing the ratio of non- or slightly-coking coal is required. However, non-or-slightly coking coal causes a lot of structural defects in the coke lump and decreases coke strength because of its low dilatation and high shrinkage.
For increasing the ratio of non- or slightly-coking coal, pre-treatment technology of coal such as the coal size control, increasing the coal bulk density and the rapid preheating reforming etc. have been developed and a new cokemaking process SCOPE21 that consists of those technologies have already started and high quality of coke is produced using over 50% of non- or slightly-coking coal. In addition, knowledge of coke structure formation mechanism and degradation mechanism of coke were remarkably developed.
This paper reviews the past research on coal utilization technologies, carbonization mechanism and coke structure and degradation behavior of coke, and describes future direction of research and development for increasing the ratio of non- or slightly-coking coal.
