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The aim of the present project was to demonstrate the inustrial feasibility of a massive injection of coal, +/- 270 kg/tHM, combined with a high O(2) enrichment of the blast. The coke rate would thus be reduced to well below 250 kg/tHM.

A reference level of 200-220 kg coal/tHM was successfully accomplished. However, the technical condition of the blast furnace hearths overruled all ambitions, the anticipated trial scheme had to be abandoned and no further trials were performed.

A very short trial was aborted shortly after reaching an injection level of around 265 coal/tHM, due to excessive generation of very fine sludge originating from incomplete combustion. This forced the operators to investigate the merits of combustion more in depth.

At the aimed low coke-rate detailed information about the gas distribution is of utmost importance. Therefore, in conjunction with the industrial tests, CRM designed a gas tracing method. Measurement of the transfer time between the injection point (a tuyere) and the sampling points (on an above-burden probe) would allow deduction of the radial gas distribution.

CRM made the design and the start-up of an installation built by Hoogovens on blast furnace 7 of Ijmuiden. Since then, repeated measurements have shown that the gas transfer time profiles are consistent with the data measured at the blast furnace top and at the wall. The modifications of the moveable armour position are reflected better and faster on the gas distribution as measured by helium tracing than on the skin flow temperatures.

Additional information

Authors: TOXOPEUS H L, Corus (formerly Hoogovens), IJmuiden (NL);DANLOY G, CRM, Liège (BE);FRANSSEN R, CRM, Liège (BE);HAVELANGE O, CRM, Liège (BE)
Bibliographic Reference: EUR 20298 EN (2002), pp.74. Euro: 11.50
Availability: EUR-OP reference: KI-NA-20298-EN-S Available from EUR-OP sales agents. URL:
ISBN: ISBN: 92-894-3439-2
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