Effect of Hot Briquetting of Preheated Coal on Carry-over during Charging

Abstract

Carry-over during coal charging is a significant factor in the increase of the carbon deposition in the coke oven chamber. Therefore, the technology of hot briquetting of fine coal has been developed in the SCOPE21 project, and the pilot scale test has been made in 2002. The main results of this study are shown below.
(1) The ratio of particle 100 μm or less in coal charge could be decreased by hot briquetting of fine coal. As a result, it was confirmed that the amount of carry-over during coal charging could be reduced about 60% compared with the case of non-briquetting.
(2) The gas velocity that passes through the free space of coke oven chamber affects carry-over particle size. In 75% period during coal charging, the gas velocity in the coke oven was 1 m/s or less. On that condition, it was hard that coal particle of 100 μm or more disperse.
(3) The hot briquetting technology developed in this study was shown to be a valuable one even in commercial operation to reduce amount of carry-over on the during coal charging.