Electric heating – Metal heating – Of cylinders
Patent
1987-09-16
1989-07-04
Leung, Philip H.
Electric heating
Metal heating
Of cylinders
219 1071, 219 1041, 219 1061R, 428659, 427 451, 118 501, 118620, H05B 606
Patent
active
048453323
ABSTRACT:
An induction galvanneal strip furnace utilizes a plurality of radiation (infrared or optical) pyrometers which measure strip temperature and provide a feedback signal which is compared with a set point or reference temperature signal from a set point generator to produce an error signal proportional to the measured variable minus the set point or reference temperature. The error signal is processed by use of a conventional proportions integrator derivative algorithm to produce a control signal which controls the electrical energy supplied to the induction coils. Each of the radiation pyrometers is positioned at the emergence or downstream side of the downstream most induction coil of a set of induction coils that it controls to thereby provide rapid, accurate control of strip temperature and with a more efficient utilization of electrical energy and high quality in the finished product. As compared to gas fired furnaces, the speed of the strip through the furnace of this invention can be increased 25 to 30 percent.
REFERENCES:
patent: 2448008 (1948-08-01), Baker
patent: 2986808 (1961-06-01), Schnedler
patent: 2992311 (1961-07-01), Keller
patent: 3056694 (1962-10-01), Mehler et al.
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patent: 3740859 (1973-06-01), Patton et al.
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patent: 4307276 (1981-12-01), Kurata et al.
patent: 4357512 (1982-11-01), Nishimoto et al.
Demorotski Michael
Jancosek David G.
Noelting Gregory
Leung Philip H.
National Steel Corp.
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