Patent ID: 7229281
Filing Date: 2007-06-12
Classification: C04B,F27B,Y02P

Abstract:
1. A method of operating a preheater/precalciner kiln having an inclined rotary vessel and a stationary portion coupled with the inclined rotary vessel wherein a stream of kiln gas flows in a direction from the inclined rotary vessel and through the stationary portion, the method comprising the steps of: advancing mineral from the stationary portion into an upper end of the inclined rotary vessel; advancing mineral from the upper end of the inclined rotary vessel to a lower end of the inclined rotary vessel; introducing a quantity of combustion air and combustible fuel through the lower end of the inclined rotary vessel; and introducing a quantity of high pressure air into the stationary portion wherein the quantity of high pressure air imparts momentum on the stream of kiln gas at a ratio of between 2 and 20 kg*m/sec per kg of gas and solids entering the stationary portion.