Lignite/coal injection system installed at the ARBED ESCH-BELVAL Works
Taking the blast furnace in operation again, a first continuous injection period was run from September to December 1980, where a new scheduled blast furnace shutdown had to occur for same reasons. During this period, lignite was injected successfully at rates increased stepwise from 50 kg to 75 kg per ton of pig iron. At the end of this period, a short test was run to prove that the injection plant can handle low-volatile coals with up to 20% ash content. At the above indicated injection rates, the pulverized lignite burnt very easily in all tuyeres, without any oxygen enrichment of the blast. The blast furnace operation and the quality of the pig iron were in no way affected by the lignite injection. During the injection period, the blast furnace burden consisted out of 97% self-fluxing sinter with an Fe-content of 48%, some rich ore pellets and low iron scraps. The blast temperature was in average 1130/sup 0/C without oxygen enrichment. The top gas temperature was raised by the injection from average 85/sup 0/C to run on 100% Coke basis to average 140/sup 0/C. The hot metal production was about 84 tons/hour. Dry coke consumption prior to lignite injection was 512 kg/ton of pig iron for a net burden of 1998 kg/ton. As the blast furnace went out of operation again end December for economical reasons, there was not yet time enough to run a representative reference period. For this reason, a statement about a replacement ratio between lignite and coke at this stage cannot be given. After furnace blown in again, the lignite injection period will be completed in order to establish practical values of the coke replacement coefficient. 12 figures.
- OSTI ID:
- 6083811
- Report Number(s):
- CONF-8103154-
- Journal Information:
- Proc., Ironmaking Conf.; (United States), Vol. 40; Conference: 40. annual ironmaking conference, Toronto, Canada, 29 Mar 1981
- Country of Publication:
- United States
- Language:
- English
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