Industrial electric heating furnaces – Resistance furnace device – Control
Patent
1991-07-15
1994-03-01
Reynolds, Bruce A.
Industrial electric heating furnaces
Resistance furnace device
Control
219485, 219497, 219390, 392416, 364477, H05B 364
Patent
active
052915140
ABSTRACT:
A method and apparatus for automatically and dynamically tuning individual heater segments of a multi-zone furnace which allows simultaneous minimization of temperature gradients within the furnace and prevention of premature aging and failure of the segments by controlling the relative temperatures thereof and equalization of the contributions of the segments to the heating of the furnace. Furnace and heater temperatures are monitored and furnace temperatures are used to develop set point biases for automatic control of heater segment temperatures. Some segments are also controlled as a function of power applied to other segments. Temperatures sensed within the furnace are combined such as by averaging to effectively provide virtual sensors in locations where sensors cannot otherwise be practically provided.
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Heitmann Walter
Waters David
International Business Machines - Corporation
Jeffrey John A.
Reynolds Bruce A.
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