Temperature Control in Slab Reheating Furnace
A reheating furnace in a hot strip mill heats steel slabs up to 1200-1280°C.
We have improved the temperature performance of the reheating furnace so saving energy and reducing the quantity of rejected slabs.
A new controller was designed based upon the following criteria: For each slab the expected end temperature is calculated with a dynamic slab model and compared with its individual set point. The average difference is used for zone temperature control.
When one or more slabs are expected to come out too cold (outside limit), the (expected) coldest slab will overrule the above mentioned average and be used for control.
As a direct result more slabs are heated within tolerance and far less slabs are rejected due to low temperatures.
