Method of drying and preheating moist fine material and apparatus for carrying out the method
AssigneeFirma Carl Still GmbH & Co. KG
InventorsHeinrich Weber, Kurt Lorenz, Horst Dungs
Life of this patent
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Abstract
A preheating moist fine material, such as pit coal and lignate, peat, wood, oil shale, or even ores or limestone for cement production, and an apparatus for carrying out the method are disclosed. Moist fine material is mixed above a heater with predried and preheated material until the mixture is made fluid. The fluid mixture slides down between and piles up to a level above the heater. A part of the predried and preheated fine material is removed from below the heater in an amount corresponding to another part thereof and is conveyed to above the heater with the moist fine material.
Claims15
A method of drying and preheating moist fine material, in particular bituminous and soft bituminous coal, peat, wood, oil shale, ores or lime stone, in a system having a single open drier chamber with heating means having heating surfaces extending into the drier chamber for indirect heating of the fine material, fine material supplied to a top of the drier chamber being able to fall upon and past the heating surfaces from the top of the drier chamber to a bottom of the drier chamber, the method comprising:
- continuously feeding a first amount of moist fine material to the top of the drier chamber above the heating means;
- conveying a second amount of predried fine material from the bottom of the drier chamber to the top of the drier chamber;
- mixing the second amount of predried fine material with the first amount of moist material at the top of the drier chamber and above the heating means to make a mixture of predried and moist fine material which is fluid;
- allowing the fluid mixture to slide down the drier chamber onto and between the heating surfaces and to pile up to a level in the drier chamber above the heating means;
- and
- removing a third amount of predried fine material from a bottom of the drier chamber below the heating means, the third amount equaling the first amount of moist fine material being fed to the top of the drier chamber.
An apparatus for predrying and preheating moist fine material, such as bituminous and soft-bituminous coal, peat, wood, oil shale, ores or limestore, comprising:
- means defining a vertically extending open drier chamber and a vertically extending open heater chamber adjacent said drier chamber;
- heating means extending through said drier and heater chambers having heating surfaces onto and past which fine material can fall for indirect heating thereof;
- means for heating moist fine material to a top of said drier chamber above said heating means;
- means for removing preheated fine material from a bottom of said heater chamber below said heating means;
- a vertical elevator extending along and adjacent said drier chamber for conveying fine material from a bottom of said drier chamber below said heating means to a top of said drier chamber above said heating means;
- a transverse conveyor mounted below said heating means in said heater chamber for conveying fine material from a bottom of said heater chamber to a lower end of said elevator;
- mixing means for mixing and distributing moist and pre-dried fine material above said heating means to the top of said drier chamber;
- and
- a hood with exhaust chimney connected at a top of said means defining said drier and heater chambers for exhausting vapors from the top of said heater and drier chambers.
Dependencies are inferred from the claim text.