Heating – Processes of heating or heater operation – Treating an article – container – batch or body as a unit
Patent
1981-10-14
1983-07-19
Camby, John J.
Heating
Processes of heating or heater operation
Treating an article, container, batch or body as a unit
266 80, 432 18, 432 37, F27D 300, F27B 940, C21B 724
Patent
active
043941214
ABSTRACT:
A control method comprises predetermining a or presuming a fuel flow rate for each of three control zones of a continuous slab reheating furnace, predicting each slab temperature after a plurality of time intervals from the presumed fuel flow rate, and controlling the fuel flow rate for each zone so as to minimize the sum of the differences between the predicted temperatures and corresponding objective temperature rise curves for all the slabs. Alternatively, the method may comprise sensing flow rates of the fuel and air for each zone at time intervals .DELTA.t, calculating the temperature profile within the furnace and then the temperature of each slab at the present time point from the sensed flow rates, repeating the calculations with the calculated slab temperature and any presumed fuel flow rate for each zone to predict the temperature profile within the furnace and each slab temperature after .DELTA.t, determining the fuel flow rate so as to render the differences between the predicted and the objective temperatures of each slab smaller than a predetermined value and controlling the fuel flow rates following the parameters thus determined.
REFERENCES:
patent: 3604695 (1971-09-01), Steeper
patent: 4255133 (1981-03-01), Tanifuji et al.
Hamasaki Yoshiharu
Kutsuzawa Masaki
Wakamiya Yoshinori
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