| 摘要 |
<p>PURPOSE:To reduce energy cost in heating and rolling section by adjusting billet ejecting temp. so that the sum of used power cost for rolling mill and fuel cost for heating furnace comes to the min. CONSTITUTION:The heating furnace DDC2 receives the lower limit value t1 and the upper limit value t2 in tolerance of the ejecting temp. from a process computer 1 and an ejecting temp. setting changing means 2b sets the setting value (t) of the ejecting temp. for the heating furnace 3 to t1. By command of a main machinery DDC4, the rolling mill line 5 executes rolling of a little quantity of the billets, to measure loaded power of a motor for rolling, and the power cost is calculated with a power cost calculating means 4a. This calculated cost value is transmitted to the heating furnace DDC2, and heating roll energy cost calculating means 2a adds data of the used fuel cost for the heating furnace from the computer 1 to calculate the heating roll energy cost. Successively, the ejecting temp. setting changing means 2b changes the ejecting temp. setting value (t) to t1+ t and in case (t) exceeds t2, the ejecting temp. setting value tm at the rolling time having the lowest heating roll energy cost in every rolling times, which have ever been executed, is set and after that, the rolling is executed.</p> |
