Coke Oven Techniques

The increasing scale and intensity of modern blast-furnace operation, combined with a simultaneous reduction in coke rate, have led to more stringent coke quality requirements with a greater emphasis on the coke's (1 2) role as a burden spacer ' • Accordingly, coke quality data limited to chemical composition, initial size grading and ambient size stability are insufficient to predict the coke's behaviour in use. A realistic assess­ ment of the likely performance of coke should also take into consideration its resistance to degradation in the chemical and thermal environment of the blast furnace. A test is, therefore, needed which simulates as far as possible the mechanical, chemical and thermal conditions of the smelting process and measures the resultant changes in size distribution of the coke, and hence in its bulk permeability to gas flow, using representative samples of the feed coke as charged to the furnace. Moreover, new developments in coke production make it necessary to reassess coke testing so as to guide the coke producer in making the best use of available coals. The mode of mechanical coke breakage at ambient temperature has been extensively characterised and related to changes in the coke's bulk permeability(3). In contrast, the causes of deterioration in the hot strength and size of bulk coke arising from its partial gasification with carbon dioxide and reheating to high temperature are relatively less explored. The present paper describes the v.

Table of Contents:
Opening Session.- - Opening address.- - Introductory address Coke supply and demand in the European Community.- - General introduction Coke and Coal in the changing technology of the blast furnace.- First Technical Session: Basic Research.- - Chairman: G. Dellanoy, Director, Centre D’Etudes et Recherches des Charbonnages de France.- - Studies of the factors controlling the formation and development of the porous structure of coke.- - Coal carbonization: formation, properties and relevance of microstructures in resultant cokes.- - Influence of the plastic properties of steam coal by means of bituminous additives.- - High temperature stability of coke in relation to its bulk permeability.- - Characterization of coal and coke.- - Round table “A” Coke and the blast furnace.- - Round table “B” Pollution problems.- - Introductory paper: Emission of tar fog from coke oven doors.- Second Technical Session: Coal Charge Preparation and Unconventional Coking Techniques.- - Further development of the Precarbon process.- - The manufacture of blast furnace coke in horizontal ovens from blends without normal quality characteristics by the combination of the preheating and stamp charging techniques.- - The use of pre-compacted coal for the manufacture of blast furnace coke.- - Formed coke from high volatile coal via char the CdF process.- Third Technical Session: Coking Techniques and Summary of Round Table Discussions.- - Chairman: K. G. Beck, Mitglied der Geschäftsführung der Bergbau-Forschung, GmbH.- - Thermal measurements on coke ovens.- - Control of coke oven heating.- - Testing of the Codeco system for the programmed heating of coke ovens.- Third Technical Session (continued).- - Chairman: J. van Langen, Head of Process Technology Department, Estel Hoogovens BV.- -Rapid devolatilization in the coking process.- - Partial repair of damaged coke chamber walls.- - Summary of the round table “A” Coke and the blast furnace.- - Summary of round table “B” Pollution problems.- - Closing address.- List of Participants.