Apparatus for burning pulverulant raw material

B - Operations – Transporting – 01 – J

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B01J 6/00 (2006.01) C04B 7/43 (2006.01) F27B 7/02 (2006.01) F27B 7/20 (2006.01)

Patent

CA 1212230

ABSTRACT APPARATUS FOR BURNING PULVERULENT RAW MATERIAL An apparatus for burning pulverulent raw material, in particular cement raw meal to cement clinker, has a kiln (1), a cooler (2), a suspension calciner (4-12) and a multi-stage preheater (14-27). The preheater is provided with two material outlet ducts (22 and 22') directing a first stream of preheated material to a suspension burning chamber (4) with a hot air inlet (7) and a fuel inlet (5) and a second stream of preheated material to a kiln gas duct (28), respectively. Rapid quenching of kiln gas and accelerated rate of combustion in suspension calciner are provided by suspending and calcining the material in the streams in the burning chamber and the kiln gas duct, respectively, and uniting the two suspensions downstream of the suspension burning chamber (4). The calcined material is precipitated in and passed to the kiln from a precipitator (9), to which the united suspensions are directed.

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