Carbon Deposition in a Coke Oven Chamber at High Productivity Operation

Abstract

SCOPE21 process uses thin oven wall of high thermal conductivity dense brick and pre-heated coal charging to achieve high coking rate. This suggests critical trouble by the increase of carbon deposits. Carbon deposition in a coke oven at high coking rate of SCOPE21 process was investigated in this study. The influences of temperature, fine coal and water existence on carbon deposition were studied in laboratory tests. Carbon deposition in coal charging and after charging was investigated in the pilot plant oven using test brick pieces.
Carbon deposition rate in top space after charging was mainly affected by temperature and was little affected by fine coal briquetting. This is supported by the laboratory test. However, considering no moisture content, the rate was smaller than the one expected by the laboratory test. The amount of carbon deposits in top space in one carbonization period was small by means of the shorter coking time and the lower top space temperature. The amount of carbon deposits in coal charging was larger than the one after charging at ordinal operation of the pilot plant oven. The deposits in the top space derived from coal had been reduced by about one-half due to the fine coal briqetting.
By applying the relationship between the carbon deposition rate in the top space and the temperature it was estimated that carbon deposits on chamber wall are not so large.
From these results, it was concluded that the carbon deposition of SCOPE21 process is not such a serious problem.