A stagnant region where coke particles move extremely slowly is formed in the hearth of a blast furnace. This dead zone is recognized to play a significant role in the performance of a blast furnace. Deadman's coke is renewed by new coke coming down from the top of deadman.[1] The floating of hearth bed can be caused by buoyancy force of heavy liquid iron.[2] It is reported that the renewal rate of deadman particles increases as the hearth bed floats and sinks.[3] But the overall replacement of dead zone has not been reported in detail. This study investigated the movement of coke particles in hearth bed with floating and sinking to examine the renewal process of deadman and the effect of coke free space height on the renewal rate of deadman .
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