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

1986-05-28

1990-09-11

Yuen, Henry C.

Heating

Processes of heating or heater operation

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

432 58, 432106, F27B 1500

Patent

active

049559869

ABSTRACT:
A method for the heat treatment of finely granular material, particularly for the manufacture of cement, employs a preferably multi-stage cyclone preheater (2), a rotary tubular kiln (1), a cooler (6) and a kiln off-gas line (5) which is formed between rotary tubular kiln (1) and cyclone preheater (2). The off-gas lines provides a passage substantially in upward direction for the off-gases of the rotary tubular kiln (1) and receives tertiary air fed thereto for the combustion of additional fuel. The tertiary air is provided in two streams from the cooler (6), which cooler is connected behind the rotary tubular (1) on the material side, the streams being introduced into the kiln off-gas line (5) at different heights. In order to separate the combustion of the additional fuel from the precalcination and to avoid the production of injurious nitrogen oxides (NO.sub.x), the additional fuel is fed exclusively to the lower partial stream of the tertiary air in such a manner that sub-stoichiometric combustion take place before the entrance of the second partial stream of tertiary air. The second partial stream of tertiary air effects a complete combustion of the additional fuel in the upper part of the kiln off-gas line (5).

REFERENCES:
patent: 4402667 (1983-09-01), Goldmann
patent: 4457705 (1984-07-01), Ramesohl et al.
patent: 4470849 (1984-09-01), Abelitis et al.
patent: 4492566 (1985-01-01), Kreft
patent: 4514170 (1985-04-01), Kupper
patent: 4579526 (1986-04-01), Kreft

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