INFLUENCE OF FINE PARTICLES ON CARBON DEPOSITION IN THE COKE-OVEN CHAMBER

The influence of fine particles such as coal and coke on the formation of carbon deposits from coal carbonization gas was studied. The carbo n deposition rate on the silica specimen greatly increased when these fine particles coexisted with coal carbonization gas at the temperatur e from 950 to 1250 K. The carbon deposition rate grew with the increas e in the concentration of fines. Fine particles surrounded with pyroly tic carbon on the silica specimen were observed by means of polarized light microscopy. The adhesion of these fines to the silica surface to ok place only when coal carbonization gas was supplied, but no adhesio n occurred in a nitrogen atmosphere. It is suggested that tar mist and /or droplets of condensed polymers with high molecular weight form a l iquid bridge between fine particles and the surface of the specimen. ( C) 1998 Elsevier Science Ltd. All rights reserved.