Pressure Generation in a Coke Oven Chamber at Coal Charging

Abstract

Displacement of coke oven chamber wall and gas pressure in the chamber was measured during carbonization, especially focused on the coal charging, in order to realize the load to the actual chamber wall. Maximum wall displacement and very large gas pressure peak were observed at CMC coal charge with 6-7% moisture. They started with coal charging and reached maximum at the end of the charging. The gas pressure at charging was higher at oven bottom and smaller for upper part. The gas pressure peak at charging was larger than the pressure in the later carbonization period or internal gas pressure. Wall displacement and gas pressure peak at coal charging were both small in a case of wet coal charge with over 9% moisture. High gas pressure generation in CMC coal charge was thought due to the carbonization gas and the low gas permeability of coal bed. The permeability of CMC coal bed is lower than that of wet coal due to not only the higher bulk density but also moisture itself. The difference in permeability together with the gas generation was large enough to explain the observed difference in the peak gas pressure.