Pore Structure Development during Carbonization of Blended Charges

摘要

The aim of the work was to investigate the mechanism of, and identify the factors influencing, the formation of pores in semicoke and coke. The effect on pore structure of coke was studied when it was made from coal mixed with a different type of coal or coke breeze. Standardised conditions of coking were employed and a microscopic technique using epoxy resin was used to examine the structure of the center of the carbonized charge. The base coal was 500 class, and the addition of up to 20% 204 class coal increased mean pore size and mean pore wall size and decreased porosity. Addition of 5% coke breeze gave the opposite effect, but not if 10% was used. The reason for the narrow range of porosities from coals with widely different swelling properties was examined and discussed.