Heating – Tumbler-type rotary - drum furnace – Having combustion products generated in or fed to drum
Patent
1983-09-02
1985-01-08
Yuen, Henry C.
Heating
Tumbler-type rotary - drum furnace
Having combustion products generated in or fed to drum
432 80, F27B 702
Patent
active
044925700
ABSTRACT:
A calcining system wherein raw material is preheated by raw material preheating device for preheating the raw material by contact with a gas, calcined in a rotary kiln and cooled in a planetary cooler; a portion of cooling gas used for cooling the calcined material in the planetary cooler and heated thereby is led through an air extracting duct to the raw material preheating device and the rest of the heated cooling gas is introduced into the rotary kiln: and exhaust gases from the rotary kiln is led to the raw material preheating device. Such calcining system further includes a first damper mounted in a duct for discharging the exhaust gas from the raw material preheating device, a temperature sensor for sensing the temperature of calcined material discharged through an outlet of the planetary cooler, control device for controlling the degree of opening of the first damper when the temperature sensed by the temperature sensor rises to a high level, a second damper mounted in the air extracting duct, a gas sensor for sensing a gas component capable of indicating the condition of combustion in the rotary kiln, and control device for controlling the degree of opening of the second damper so as to bring the value of the gas component sensed by the gas sensor to a predetermined level. The flow rate of the cooling air can be controlled independently of the control of the flow rate of the air combustion, so that the temperature of the calcined material at the outlet of the planetary cooler can be kept at a predetermined level selected arbitrarily and the combustion in the rotary kiln and the calciner can be stabilized irrespective of changes in the conditions of operation.
REFERENCES:
patent: 3302937 (1967-02-01), Pixley
patent: 3891383 (1975-06-01), Kobayashi
patent: 4094626 (1978-06-01), Boyhont et al.
patent: 4105396 (1978-08-01), Ritzmann
patent: 4299560 (1981-11-01), Nakamura et al.
Kumagai Chikanori
Murao Mikio
Suzuki Takeshi
Uchida Masahiro
Yotsui Yasuhiko
Kawasaki Jukogyo Kabushiki Kaisha
Yuen Henry C.
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