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Describe the synthesis of metallurgical coke by otto-Hoffmann method. (in 8 Mark's) |
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Answer» All the valuable products are recoveredfrom the outgoing flue gases.Construction: It consists of no. of NARROW rectangularchambers made of silica bricks. Fig. 6: A single CHAMBER of Otto Hoffmann’s oven Working: Coal is charged into the chamber.The coke ovens are heated to 1200oC by burninggaseous fuels.The process of carbonization takes place layer bylayer in the coal charge. As the coal adjacent to the oven walls gets heated, aplastic zone is formed which moves away from thewalls towards the CENTRAL zone. As the coal is CONVERTED into coke, there is decreasein volume. This is because of the removal of volatilematter in the form of tar and gas at about 500OC. Atfurther high temperature, the plastic mass solidifiesinto hard and porous mass called coke. |
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