Energy-saving-operation recommending system

An energy-saving-operation recommending system in a rolling line for rolling a material to be rolled using a plurality of facilities including a finishing mill having a plurality of rolling stands, comprising:

• one or more processors configured to:
• calculate total energy consumption of the plurality of facilities during passage of one material to be rolled through the rolling line,
• divide the total energy consumption by a width and a length of the material to be rolled before rolling to calculate an energy consumption reference value that defines energy consumption per unit width and unit length of the material to be rolled, and
• store the calculated energy consumption reference value in association with a steel grade and a target post-rolling plate thickness of the material to be rolled in an energy consumption reference value table;
• and
• a sensor configured to measure a crown value of a material on a downstream side of the finishing mill and output a signal representing the crown value,
• wherein the one or more processor is further configured to:
• obtain an energy consumption reference value corresponding to a steel grade and a target post-rolling plate thickness of a material to be next rolled on the rolling line, from the energy consumption reference value table,
• multiply the energy consumption reference value obtained from the energy consumption reference value table by a width and a length of the material to be next rolled to calculate predicted energy consumption predicted to be consumed by the plurality of facilities during passage of the material to be next rolled through the rolling line,
• obtain the signal representing the crown value output from the sensor, and
• recommend to an operator an operation condition reducing energy consumption consumed by the plurality of facilities to be smaller than the predicted energy consumption while maintaining a product quality of a rolled material and a mechanical property of a product material quality within an allowable range including increasing a rolling load distribution ratio of a front stand of the plurality of rolling stands and reducing a rolling load distribution ratio of a rear stand of the plurality of rolling stands when the crown value as determined from the signal representing the crown value output from the sensor is an allowable value or smaller, which is set to be smaller than an upper limit value of the product quality.