Heating – Processes of heating or heater operation – Including passing – treating or conveying gas into or through...
Patent
1976-10-27
1978-08-22
Camby, John J.
Heating
Processes of heating or heater operation
Including passing, treating or conveying gas into or through...
432 58, 432106, F27B 1500, F27B 702
Patent
active
041085930
ABSTRACT:
A method is disclosed for heat treating pulverulent or granular raw material such as cement meal. Raw material is directed to at least two multi-stage preheater strings, the first string communicating with the kiln by a smoke riser pipe and the second string having a calciner positioned at its lower end portion. The raw material directed to the first preheater string is divided into two divisional flows with the first divisional flow comprising substantially the maximum amount of material which can be substantially completely calcined by hot gases exiting the kiln. The first divisional flow of raw material is directed toward the upper material inlet end portion of the kiln so as to be entrained by the hot gases exiting the kiln, and the hot kiln gases and entrained material are directed to the first preheater string. The second divisional flow is directed to the second preheater string where it is calcined either alone or with raw material directed to the second string. The substantially completely calcined material exiting the first preheater string and at least partially calcined raw material exiting the second preheater string are directed to the upper material inlet end portion of the kiln at a location and in a manner so as to avoid entrainment by the hot exit gases and pass down through the kiln for further heat treatment. A plant is disclosed for practicing the inventive method.
REFERENCES:
patent: 3864075 (1975-02-01), Christiansen
patent: 3881861 (1975-05-01), Ritzmann
patent: 3914098 (1975-10-01), Kano et al.
patent: 3938949 (1976-02-01), Christiansen
patent: 3940241 (1976-02-01), Houd
patent: 3947238 (1976-03-01), Fukuda et al.
patent: 4002420 (1977-01-01), Christiansen
patent: 4022568 (1977-05-01), Meedom
patent: 4045162 (1977-08-01), Christiansen
Camby John J.
F. L. Smidth & Co.
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