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AssigneesFirma Carl Still GmbH & Co. KG, Rheinische Braunkohlwerke AG
InventorsHeinrich Weber, Kurt Lorenz, Horst Dungs, Roman Kurtz, Hans-Joachim Kersting
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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. 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 includes means for circulating the hot gases into each of the stages. Hot inert combustion gases are introduced into the circulating gases to avoid condensation of liquids.
In a combination with a method of producing abrasion resistant coke from brown coke briquets in a shaft furnace of the type having a top inlet for receiving a charge of the coal briquets and a bottom outlet for removing the coke in which the brown coke briquets are serially preheated, and, carbonized and cooled in stages by directing inert hot combustion gases into the furnace in contact with the briquets, and with the gas removed and recirculated in circuits for each of the respective preheating, drying and carbonizing stages in which there is recirculated gas substantially composed of inert hot combustion gases obtained from the carbonizing of the brown coke briquets, the improvement comprising introducing additional inert hot combustion gases into the furnace in said preheating and drying stages at a temperature and in an amount sufficient to raise the temperature of the circulating gases removed from the respective preheating and drying stages to at least 20C..degree. above steam saturation temperature of the combined gases.
Dependencies are inferred from the claim text.