Abstract
This paper gives a brief overview of process control in slab reheating furnaces, zooming on the so-called “funnel-concept”, as this is implemented at Corus IJmuiden this year. The control automation in reheating furnaces at Corus started in 1970. In 1985-1990 an on-line slab temperature calculation and control system has been developed and implemented at pusher-and walking-beam furnaces. Ongoing development of this model resulted in a control strategy where the target-heating curve of each individual slab was extended by an upper and lower limit, of which the interval at the entrance gradually diminished to the end of a zone: the funnel model.
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