Advanced Technology and Application of Large Scale Coke Dry Quenching (CDQ)

摘要

Coke Dry Quenching (CDQ) is a heat recovery system to quench red hot coke from a coke oven to a temperature appropriate for transportation. It is an energy-saving system in which, during quenching process, sensible heat of the red hot coke is recovered and utilized for power or steam generation. CDQ is a gradual coke quenching system and can improve the coke strength as raw material for blast furnace and coke size distribution can be improved in the process of descending coke packed bed. These characteristics are useful for stable operation of a blast furnace, in order to secure good gas and solid reaction by keeping permeability in a blast furnace.JP Steel Plantech Co., Japan constructed 200 t/h and 185 t/h large-scale CDQs through technological improvements and scaling up of the CDQ facility, which was introduced from the former Soviet Union in 1972. Up to now, these CDQs have kept up a yearly operating ratio of 95%, even after operation for 25 years and 18 years, respectively. In order to achieve these high operating ratios, this paper introduces the facilities for this technology, which make these factors realizable and need to be taken into consideration.