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AssigneeMetallgesellschaft Aktiengesellschaft
InventorsHarry Serbent, Detlev Schlebusch, Gerhard Reuter, Wolfram Schnabel
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In the treatment of bulk materials with hot gases below the melting point of the charge component it is desired to prevent a formation of undesired crusts during normal operation and when the rotary kiln is operated at a reduced speed during short-time trouble. For this purpose, a controlled dissipation of heat is effected in several sections of the rotary kiln in that the shell of the kiln and the refractory lining are cooled so that the temperature of that portion of the inside surface of the rotary kiln which is submerged below the charge is always maintained at or up to 50.degree. C. below the temperature of the charge disposed thereover.
In a process of thermally treating bulk material with hot gases in a rotary kiln below the melting point of the charge components in the rotary kiln while cooling the shell and refractory lining of the kiln, the improvement which comprises cooling several sections of the rotary kiln in which the charge is at about the highest permissible temperature in regard to the formation of crusts if the temperature of the charge rises further in contact with the hot inner surface, by a cooling medium and adjusting the temperature of the inside surface of the kiln at the point where it becomes submerged below the charge in said region so that it is at or up to 50.degree. C. below the temperature of the charge in said regions thereby controllably dissipating heat through the lining of the kiln to said cooling medium.
Dependencies are inferred from the claim text.