Importance

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Abstract

A method of producing abrasion resistant coke from brown coal briquets in a shaft furnace comprises charging the coke briquets into the top of the furnace and removing coke from the bottom of the furnace while directing inert hot combustion gases into the furnace and through the briquets at a plurality of vertically spaced levels throughout the height of the shaft furnace. Gases are directed at temperatures to effect and successively lower stages of the furnace the preheating, predrying, carbonization, and cooling of the charge. In accordance with a feature of the invention, gases are collected in each of the preheating and predrying stages by the use of a tubular suction arm which extends substantially across the width of the furnace and includes a performated bottom and sidewalls which extend partly below the bottom and are provided with a saw-tooth configuration so as to withdraw the gases through the space below the bottom and through the perforations of the bottom and to effect entrainment of dust from the charge in so doing. The shaft furnace construction for carrying out the method includes means for circulating the hot gases into each of the stages and the closed tubular suction arm which extends substantially across the whole width of the furnace in each of the preheating and predrying stages includes a bottom perforated wall and side walls which extend downwardly beyond the bottom and arranged so as to draw off a percentage of the gases from the associated stage and in so doing prevent the outflow dust along with the gases. The construction is such that about 10% of the gases is evacuated below the perforated bottom and then up through the bottom and withdrawn through the suction arm.

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First Claim