Cement kiln system with preheater and heat exchanger

Details Cement kiln system with preheater and heat exchanger Cement kiln system with preheater and heat exchanger

F - Mech Eng,Light,Heat,Weapons

27

B

39/20, 39/33

F27B 7/00 (2006.01) F27B 15/00 (2006.01)

Patent

CA 1070941

CEMENT KILN SYSTEM WITH PREHEATER AND HEAT EXCHANGER ABSTRACT OF THE DISCLOSURE A method and an apparatus is disclosed for producing such as Portland cement from pulverant raw material in a system having at least a multistage preheater (3, 5, 7 and 9) and a rotary kiln (11). The preheater may be of the type having a series of stages each provided by a cyclone dust separator (3, 5, 7 and 9) for successively preheating the raw material in a counterflow of kiln waste gases and in which an identified one of the stages (7) discharges a gas flow containing more thermal energy than can be used to advantage in preheating material in the remaining stages (5 and 3) through which such gases must pass before dispersing in the surrounding atmosphere. A portion of the gases passing from the identified stage (7) is diverted to a heat exchanger (20) which utilizes the heat energy in such kiln waste gases to heat a clean stream of air, and the heat exchanger (20) discharges such gases and air in separate and unmixed streams (21 and 24). The thermal energy transferred to clean heated air is in turn delivered to the kiln (11) and/or an auxiliary furnace (14) connected to discharge into the kiln waste gas flow between the kiln (11) and the identified stage (7), and such delivery of clean heated air provides heated combustion air for the burning of fuel in the kiln (11) and/or auxiliary furnace (14).

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