Apparatus for thermal processing of raw materials in dust form

Details Apparatus for thermal processing of raw materials in dust form Apparatus for thermal processing of raw materials in dust form

1995-10-10

1998-01-06

Bennett, Henry A.

Heating

Tumbler-type rotary - drum furnace

Having combustion products generated in or fed to drum

432 14, 432 58, F27B 700, F27B 1500

Patent

active

057047804

ABSTRACT:
A partial flue gas stream is extracted from the rotary kiln of a cement plant. This partial bypass of hot flue gas is passed through a cooler (23) and then passed through a dust collector (24). Fine granular dust (30) from the dust collector (24) is fed directly to a dust collecting vessel. The coarse granular dust (28, 29) from the dust collector (24) is fed to a suspension type cyclone heat exchanger (33) operated directly with cooling air (32) and there cooled by means of direct heat transfer. The heated cooling air (39) extracted from the hot dust cooler (33) by a draft fan (40) is fed to the partial flue gas stream, such as by feeding it to the gas stream cooler (23).

REFERENCES:
patent: 4295823 (1981-10-01), Ogawa et al.
patent: 4496396 (1985-01-01), Steinbiss et al.
patent: 4541245 (1985-09-01), Becker et al.
patent: 4955986 (1990-09-01), Maury et al.
German language Journal "Zement-Kalk-Gips" No. May 1978, pp. 236-238, w/English translation.

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