To eliminate the occurrence of a material, such as the coal ash, etc., adhering to the internal wall of a preheating chamber and, at the same time, to raise the temperature in the preheating chamber in the optimum heating pattern, by arranging a plurality of burners on the facing longitudinal walls of the preheating chamber at prescribed intervals in the longitudinal direction as means for raising the temperature of the exhaust combustion gas of a rotary kiln.
As exhaust combustion gas temperature raising means which are provided for raising the temperature of the exhaust combustion gas of a rotary kiln 9, for example, three burners 21A which are used for burning fuel injected into a preheating chamber 5 together with the residual oxygen in the exhaust combustion gas in the kiln 9 are arranged in rows on the facing longitudinal walls of the chamber 5 closely to a continuous fire gate 2 along the longitudinal direction of the chamber 5. In addition, a wind box group 6 composed of a plurality of wind boxes is arranged in parallel with each other against the preheating chamber 5. The temperature of a gas for heating immediately below the fire grate 2 is maintained at a target value by detecting the temperature of the gas by means of a temperature sensor, and adjusting the opening of each damper of a suction fan 7 based on the output of the sensor.
IWASAKI NOBUYUKI
HASEGAWA NOBUHIRO
Next Patent: GRATE BAR LOCKING MECHANISM ON SIDE WALL OF SINTERING MACHINE PALLET