Heating – Processes of heating or heater operation – Including passing – treating or conveying gas into or through...
Patent
1976-05-28
1978-01-31
Camby, John J.
Heating
Processes of heating or heater operation
Including passing, treating or conveying gas into or through...
432 16, 432106, F27B 1500, F27B 700
Patent
active
040713091
ABSTRACT:
A method and an apparatus is disclosed for producing such as Portland cement from pulverant raw material in a system having at least a preheater and a rotary kiln. The preheater may be of the type having a series of stages each provided by a cyclone dust separator for successively preheating the raw material in a counterflow of kiln waste gases and in which an identified one of the stages discharges a gas flow containing more thermal energy than can be used to advantage in preheating material in the remaining stages through which such gases must pass before dispersing in the surrounding atmosphere. A portion of the gases passing from the identified stage is diverted to a heat exchanger which utilizes the heat energy in such kiln waste gases to heat a clean stream of air. The thermal energy transfer to clean heated air is in turn delivered to the kiln and/or an auxiliary furnace connected to discharge into the kiln waste gas flow between the kiln and the identified stage, and such delivery of clean heated air provides heated combustion air for the burning of fuel in the kiln and/or auxiliary furnace.
REFERENCES:
patent: 3452968 (1969-07-01), Shimizu et al.
patent: 3940241 (1976-02-01), Houd
Allis-Chalmers Corporation
Camby John J.
Streich Arthur M.
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