コークスの高温劣化による異常炉況

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In the last period of the 25th campaign, during which coke (B) made from an inferior coal mixture was used, a stagnant stock movement and an increase of pressure drop in the lower region occurred at the times when maximum volume of molten products was accumulated in the hearth. Observations with a fibre or bore-scope showed : (1) Feeding of flaky coke fines from above into the raceway around the tuyere nose ; (2) Scattering of coke fines in the upper bosh (at the position B_<III-1>) ; (3) Alternative fluidization and rapid descent of flaky coke fines in the furnace center (at the position C_<II-1>) ; (4) Rise of slag bath surface to a high level (at position C_<II-1>). These phenomena together with the results of hot-model experiments made the authors conclude that the flaky coke fines, generated at some high-temperature region above the combustion zone as a result of a degradation of charged coke, accumulated gradually in the bosh and hearth and caused a marked increase of slag hold-up and of resistance to gas flow. Investigations on the cooled furnace contents after blowing-out suggested that the degradation, or the revelation of defects inherent in coke (B), might start at about 1000℃ in the lower shaft and become remarkable in the belly. Though a degradation due to the gasification with CO_2 may be supposed, other mechanisms should also be examined in view of a large quantity of alkaline matters adsorped by coke in the region from lower shaft to belly.
社団法人日本鉄鋼協会の論文
1976-04-01

コークスの高温劣化による異常炉況

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