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

1997-05-06

1998-10-13

Walberg, Teresa J.

Heating

Tumbler-type rotary - drum furnace

Having combustion products generated in or fed to drum

432 77, 432 78, F27B 702

Patent

active

058203630

ABSTRACT:
A cement clinker manufacturing installation a rotary kiln (10) having secondary firing and a grate cooler (16) with a high degree of heat recuperation. Instead of placing the grate cooler (16) in-line with the rotary kiln (10), the grate cooler (16) is positioned with its clinker transport direction (16a) transverse to the longitudinal axis of the rotary kiln (10). This angular positioning of the grate cooler (16) permits a discharge of hot air from the grate cooler as combustion air for the secondary firing of the calcination state by way of a discharge opening (20 or 21) on the lateral half of the kiln discharge housing (11) in which the beginning of the recuperation zone of the grate surface (15) of the grate cooler (16) is located. Thus somewhat cooler secondary air (18) flows into the rotary kiln (16) thereby avoiding excessively high temperatures at the rotary kiln discharge without reduction in overall thermal efficiency of the cement plant.

REFERENCES:
patent: 3469828 (1969-09-01), Lane
patent: 3837792 (1974-09-01), Deussner
patent: 4014642 (1977-03-01), Helming
patent: 4076493 (1978-02-01), Gardner
patent: 4170183 (1979-10-01), Cross
patent: 4474524 (1984-10-01), Kawakami et al.
Cover and pp. 3 and 4 of brochure No. 7-330 KHD Humboldt Wedag AG.

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