Heating – Processes of heating or heater operation – Including passing – treating or conveying gas into or through...
Patent
1975-03-19
1977-01-25
Camby, John J.
Heating
Processes of heating or heater operation
Including passing, treating or conveying gas into or through...
432 58, 432105, 432106, F27B 1500, F27B 702
Patent
active
040048764
ABSTRACT:
A method of burning pulverous raw materials in a rotary kiln is disclosed wherein the material is preheated and at least partially calcined prior to subjecting it to a finishing heat treatment such as sintering. The calcination of the raw material is accomplished prior to the final burning by feeding preheated at least partially calcined raw material to the upper inlet end portion of an inclined rotary kiln and mixing it intimately with a fuel capable of producing a combustible gas. The combustible gas thus produced is passed to a calcination chamber communicating with the upper end of the rotary kiln. Substantially uncalcined raw material is suspended in the gas mix while an oxygen-containing gas capable of supporting combustion in the calcination chamber is provided causing the oxygen-containing gas to be ignited and calcined substantially isothermally. A rotary kiln plant for practicing the method is also disclosed in which the raw material is at least partially calcined in a calcination chamber communicating with the rotary kiln.
REFERENCES:
patent: 1558965 (1925-10-01), Clevenger
patent: 2063233 (1936-12-01), Debuch
patent: 2694565 (1954-11-01), Sainderichin
patent: 3758266 (1973-09-01), Retali et al.
patent: 3770369 (1973-11-01), Mikami et al.
patent: 3881862 (1975-05-01), Nishida et al.
patent: 3904353 (1975-09-01), Bosshard et al.
Camby John J.
F. L. Smidth & Co.
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