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The substitution of 30�40 % coke by pulverised coal in the iron-making process in blast furnaces is a standard operation today. Disadvantageous indications limiting the exchange of coke had been observed, caused by the accumulation of not completely oxidised coal in the lower part of the blast furnace, and were compensated only partly by modified operating conditions. Further efforts carried out at Thyssen Krupp Stahl AG have concentrated on improving the oxidisation of pulverised coal at high injection rates. Preliminary studies showed that with the injection of thermal pretreated pulverised coal, complete oxidisation can be achieved.

In the first stage of the project, a system for injecting preheated pulverised coal in 20 of 40 tuyeres was constructed and successfully tested. During the second stage, the existing system was extended by an additional system for intermediate removal of steam and excess carrier gas and by further preheating to achieve higher temperatures of pulverised coal in five tuyeres. Operational data were collected to evaluate the economic benefits of the system. To get information about condition changes inside the tuyeres, a mathematical simulation model was developed.

After injecting preheated pulverised coal for more than two years, it was decided toinstall a preheating system on the other 20 tuyeres. No clear effect of the injection of degassed pulverised coal with a slightly higher temperature in five tuyeres was found.

Additional information

Authors: LANGNER K, Thyssen Krupp Stahl AG, Duisburg (DE)
Bibliographic Reference: EUR 20633 EN (2003), 102 pp. Euro: 25.00
Availability: EUR-OP reference: KI-NA-20633-EN-S Available from EUR-OP sales agents URL:
ISBN: ISBN: 92-894-5218-8
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