| 摘要 |
PURPOSE:To enable the quality of coke to be kept constant and to reduce the quantity of heat to be consumped, by changing the feed rate of fuel from a high flow rate in the early stage of dry distillation to a low flow rate according to hydrogen concn. in gas generated from a coking chamber or conducting first change to stop fuel supply. CONSTITUTION:In a coke oven, coke is softened and molten at 350-400 deg.C and then resolidified and thermal conductivity is rapidly increased at a semi-coking temp. of 500-600 deg.C. Until temp. reaches this level, fuel is fed at a high feed rate to effect premature coking. Thereafter, the fuel feed is stopped or the feed rate of fuel is extremely decreased, whereby the quality of coke can be kept constant and at the same time, the quantity of heat to be consumed can be reduced. With regard to change in the concn. of hydrogen in gas generated from a coking chamber, the rate of change of hydrogen concn. temporarily becomes zero when the temp. of coal core reaches 500 deg.C, and then the rate of change is gradually increased. Accordingly, the first change of fuel feed is conducted between the points A and D in the figure.
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