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The aim of this project was to study the extension of the coking coal range for preheating. The 6t oven of the INCAR Experimental Test Plant and the Ensidesa 2t/h preheating pilot plant were used. Results show that one of the advantages of preheating is that it widens the coking coal range. A Spanish high V.M. coal seems to be more successful than a semianthracite and the latter more than an anthracite. Only 3% of anthracite could be added without impairing coke quality, as crushing difficulties arise. Preheating does not greatly improve the quality of good coking coal blends. The most suitable preheating temperature is found to be between 200-220 C, the coke quality being impaired above this temperature range. The main disadvantages of preheating are the need to handle hot coal, carry over and the preheater fines. Preheater fines are strongly dependent on the size of the coal entering the plant. For this reason, coal for preheating can be crushed less finely than by a conventional wet charging process, leading to energy saving. Carry over was not dependent on the coal size entering the oven. Lowering the temperature of the oven, by removing the heating gas for 1 hour before charging, was the only successful way to reduce the carry over from preheated charges.

Additional information

Authors: ALVAREZ R, Consejo Superior de Investigaciones Científicas (CSIC), Madrid (ES)
Bibliographic Reference: EUR 13102 ES (1990) 70 pp., FS, ECU 7.50
Availability: (2)
ISBN: ISBN 92-826-1950-8
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