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AssigneeAllis-Chalmers Corporation
InventorIsao Yamane
Estimating the term…
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.
A method of producing such as Portland cement clinker in a system including at least a preheater and a rotary kiln, with the cement being made from pulverant feed material pre-sintered in the preheater and then fed to the rotary kiln, with said pulverants being pre-sintered in a counterflow of kiln waste gases passing through multi-stages (3, 5, 7 and 9) of raw material preheating in the preheater, and in which a flow (e.g., in flue 4) of said kiln waste gases from an identified one of said stages (e.g., stage 7) contains more thermal energy than can be utilized to advantage in preheating the raw material in the remaining stages (e.g., stages 5 and 3) through which such gases pass before dispersing in surrounding atmosphere, said method comprising the steps of:
A method of producing such as Portland cement clinker in a system including at least a preheater including an auxiliary furnace (14), a rotary kiln, with the cement being made from pulverant feed material pre-sintered in the preheater, fed to the rotary kiln, with said pulverants being pre-sintered in a counterflow of kiln waste gases passing through multi-stages (3, 5, 7 and 9) of raw material preheating in the preheater, and in which flow (e.g., stage 7) contains more thermal energy than can be utilized to advantage in preheating the raw material in the remaining stages (e.g., stages 5 and 3) through which such gases pass before dispersing in surrounding atmosphere, said method comprising the steps of:
An apparatus for producing such as Portland cement clinker with the apparatus including at least a preheater, a rotary kiln and a blower (13) connected to the preheater to draw kiln waste gas therethrough in which pulverant feed material is pre-sintered in the preheater and then fed to the rotary kiln, with said preheater having multi-stages (3, 5, 7 and 9) in which pulverants are pre-sintered in a counterflow of kiln waste gases which pass through said multi-stages (3, 5, 7 and 9) and then into an inlet (12) of said blower (13), and having one of said stages (e.g., stage 7), identified as discharging a flow of kiln waste gases that contains more thermal energy than can be utilized to advantage in preheating the raw material in the remaining stages (e.g., stages 5 and 3) through which such gases pass before reaching said inlet (12) of said blower (13), with an improvement comprising:
An apparatus for producing such as Portland cement clinker with the apparatus comprising preheater including an auxiliary furnace (14), a rotary kiln (11) and a blower (13) connected to the preheater to draw kiln waste gases therethrough, in which pulverant feed material is pre-sintered in the preheater and then fed to the rotary kiln, with said preheater having multi-stages (3, 5, 7 and 9) in which pulverants are pre-sintered in a counterflow of kiln waste gases which pass through said multi-stages and then into an inlet (12) of said blower (13), and having one of said stages (e.g., stage 7) identified as discharging a flow of kiln waste gases that contains more thermal energy than can be utilized to advantage in preheating the raw material in the remaining stages (e.g., stages 5 and 3) through which such gases pass before reaching the inlet (12) of the blower (13), with an improvement comprising:
Dependencies are inferred from the claim text.