Furnaces – With control means responsive to a sensed condition – Feed control
Patent
1997-11-28
1999-09-28
Yeung, James C.
Furnaces
With control means responsive to a sensed condition
Feed control
110185, 110186, 110190, 110204, 110206, 110225, 110227, 110342, 110345, 110346, F23N 518, F23G 504
Patent
active
059570644
ABSTRACT:
A multiple hearth furnace having a drying zone, a combustion zone and a cooling zone includes a recirculation loop that recycles exhaust gas from the drying zone to the cooling zone. In some embodiments, a first control loop including a temperature measurement device that measures temperature in the combustion zone controls fan speed of a recirculation fan that drives the recirculation loop. A second control loop monitors recirculation fan temperature and overrides the first control loop if the recirculation fan temperature exceeds a predetermined maximum. A third control loop controls air flow into the furnace.
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Barry Louis T.
McCormick Mark B.
Ciric Ljiljana V.
Yeung James C.
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