Blast furnace (BF) ironmaking maintains its role as the predominating process for producing hot metal (HM) from iron ore. The process is highly carbon-consumption and emission intensive. Considering its massive produc...
Blast furnace (BF) ironmaking maintains its role as the predominating process for producing hot metal (HM) from iron ore. The process is highly carbon-consumption and emission intensive. Considering its massive production scale, any improvement of the process in terms of the operational parameters could results in significant social, environmental and economical benefits. The most concerned operational parameters of the BF is the coke rate, with the reduction of the coke rate being long time pursued. However, the limit of coke rate reduction for an operating BF is rarely attempted for safety and stability. Therefore, the limit for coke rate reduction for an operating BF largely remains implicit, with the underlying mechanism being unknown. In this work, a previously developed multifluid BF process model is used to investigate the limit of coke reduction on an experimental scale BF. With the gradual reduction of the coke rate, the BF is analysed in detail in terms of in-furnace multiphase flow, thermochemical behaviors as well as overall performance indicators. The minimum coke rate to maintain a targeted production is identified with the underlying mechanism for the BF operated with a coke rate at its limit explained. Also, possible measures for increasing the limits of coke reduction are proposed. This is done by increasing the hot blast temperature, which proves to be useful based on the simulation results. The results generated from this work should be useful to improve the BF ironmaking process efficiency, hence cutting CO2 emission and guiding green production in the future.
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