| 摘要 |
PURPOSE:To heat various slabs of different loads to target extraction temps. with good accuracy by determining the flow rates of fuel in respective control zones in such a way as to minimize the sums of squares of the respective deviations of the preheating temps. and target temp. elevation curves of the respective slabs in a furnace after arbitrary times. CONSTITUTION:The gas temp. distributions and slab temps. of the current time are determined by using the average values of the actually flow rates indicated in fuel flow meters 3 of the respective control zones of a continuous heating furnace 1, as well as the gas temps. and slab temps. at the previous calculation. Next, with these determined values as initial values, the fuel flow rates of the respective control zones are assumed, and the gas temp. distributions and slab temps. after an arbitrary time are calculated to forecast. Next, from the slab positions of the current time, the slab positions after the arbitrary time are forecast, and from the target temp. elevation curves of the respective slabs, the target temps. of the respective slabs are determined. The flow rates of the control zones are set by an arithmetic device 5 so as to minimize the sums of squares of the deviations of the above-mentioned forecast temps. and target temps., multiplied by the coefficients of the weights of the respective slabs. The fuel flow rates of burners 2 are controlled by the device 5 via control valves 4. |
