焼結鉱粒度別装入法によるオールコークス操業の改善

概要

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A charging method of sinter segregated into fine and coarse particles was developed, in order to improve the gas flow distribution in a blast furnace under all coke operation. In advance, the characteristics of the distribution of size-segregated sinter at the furnace top was investigated by model tests. The main results obtained are as follows : (1) The average value of void fraction of sinter separated into fine and coarse particles is higher by 1 to 2% than that of conventional unseparated sinter. (2) Since the angle of inclination of fine sinter is considerably influenced by gas flow, fine sinter should be charged in the peripheral region of the furnace where the gas velocity is low. (3) Desirable charging mode is the type of L ↓[○!S]↓ because this mode guarantees good gas perme ability and stable burden profile. (4) The thickness of layer which contains the fine sinter layer in the peripheral region should be decreased in order to develop the peripheral gas flow and flatten the radial gas flow distribution. The charging method was applied to Muroran No. 4 BF without oil injection and proved to be effective for a reduction of coke rate and an improvement of gas permeability. As the result of the measurements by a vertical probe in the furnace, the cohesive zone profile was estimated to be an inverted V type with a low apex and a high root.
社団法人日本鉄鋼協会の論文
1983-10-01