Patent ID: 8474387

Claim:
A system for the production of mineral combustion products such as cement clinker out of raw meal having a raw meal preheater system with a raw meal calciner, a rotary kiln and a clinker cooler, with the calciner being positioned to receive hot exhaust gases from the kiln, an improvement comprising a vertically situated first combustion chamber having input for combustible solid waste fuels and waste gases, said first combustion chamber being a down draft chamber in which there is a downward flow of combustion gas and solid waste fuel to a waste and gas outlet; and a second combustion chamber for solid waste fuels having an inlet flow connected to the outlet of the first combustion chamber and an outlet flow connected to the calciner, said second chamber being adaptable to support solid waste on a supporting surface incorporated in the compartment and further being adaptable to also receive waste fuel for incineration from a source other than the first combustion chamber and to provide a longer solid waste residence time than the first combustion chamber, said second chamber having means to transport any uncombusted solid waste therein along a circular path of a rotating rotary disc to its outlet and then to the calciner while simultaneously subjecting said waste to incineration.