| 摘要 |
PURPOSE:To decrease the time required for changing a furnace temp., the deviation of a target strip temp. and the length of a defective strip temp. in the titled method for controlling the fuel flow rate of a continuous annealing furnace by setting the fuel flow rates respectively at a max. and min. at the time of increasing and decreasing the furnace temp. CONSTITUTION:A combustion rate is set at an upper limit value QU simultaneously with changing the setting of the furnace temp. at the time theta0 in the case of; for example, increasing the furnace temp. The time theta1<a> is then set by calculating the calculation equation for predicting the relation based on the actually strip temp. measured with a thermometer for the strip temp. on the outlet side of a heating zone. The combustion rate is changed from QU to the combustion rate to be determined from the ordinary strip temp. control upon lapse of said time. The strip temp. is thereby controlled to the target temp. OTS at the time theta2<a>. The time required for changing the furnace temp. is thereby shortened at the time of changing the furnace temp. to the necessary furnace temp. when operating conditions are changed. In addition, the deviation of the strip temp. from the target value and the length of the defective strip temp. are decreased.
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