Method for the heat treatment of finely granular material

Details Method for the heat treatment of finely granular material Method for the heat treatment of finely granular material

1988-12-19

1990-05-29

Yuen, Henry C.

Heating

Processes of heating or heater operation

Including passing, treating or conveying gas into or through...

432106, 432 58, F27B 702

Patent

active

049291785

ABSTRACT:
A method for the heat treatment of finely granular material, particularly for the production of cement, employs a multi-stage cyclone preheater, a rotary tubular kiln, a cooler, and a single kiln off-gas line which is formed between the rotary tubular kiln and the cyclone preheater and is flown through substantially in upward direction by the off-gasses of the rotary kiln and to which tertiary air is fed in two partial-streams for the combustion of additional fuel. The method employs steps of feeding fuel to a lower partial stream of tertiary air, directing material to be treated above a second partial stream of tertiary air, and applying precalcined material in countercurrent with the off-gas line below the tertiary air.

REFERENCES:
patent: 4402667 (1983-09-01), Goldmann
patent: 4470849 (1984-09-01), Abelitis et al.
patent: 4492566 (1985-01-01), Kreft
patent: 4514170 (1985-04-01), Kupper
patent: 4530661 (1985-07-01), Herchenbach et al.
patent: 4579526 (1986-04-01), Kreft et al.
patent: 4640681 (1987-02-01), Steinbiss et al.
patent: 4747879 (1988-05-01), Wolter et al.
patent: 4759711 (1988-07-01), Ichiyanagi et al.

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