Patent DE-102008055650-A1 (DE)
Title: Method for minimizing energy demand and carbon dioxide ejection in a continuous furnace arranged downstream to a thin-slab plant, comprises entering material dependent cool strategy and threshold value in model calculator
Inventor: PLOCIENNIK UWE
IPC: B22D11/22
Filed: 2008-10-29
Abstract: The method for minimizing energy demand and carbon dioxide ejection in a continuous furnace arranged downstream to a thin-slab plant under use of a model calculator with a data exchange between calculator and the thin-slab plant, comprises entering material dependent cool strategy and threshold value in the model calculator, and considering process data and control data of continuous casting plant. The steel grade and the chemical analysis, the mold size, the casting temperature, and casting speed belong to the process data. The method for minimizing energy demand and carbon dioxide ejection in a continuous furnace arranged downstream to a thin-slab plant under use of a model calculator with a data exchange between calculator and the thin-slab plant, comprises entering material dependent cool strategy and threshold value in the model calculator, and considering process data and control data of continuous casting plant. The steel grade and the chemical analysis, the mold size, the casting temperature, the casting speed, the used casting powder and the water quantity in the mold for the secondary cooling belong to the process data, and/or the data of the casting mirror movement is received from the plant as control data. The power measurement is carried out for determining the position of the solidification of the strands like a temperature detection and surface error detection. The water quantity necessary for the cooling and its distribution are determined in the plant and/or the casting speed. The power measurement takes place at the rolls of the last segments of the strand guide or at the end of the strand guide and before the continuous oven. The casting speed is adjusted so that the position of the solidification point of 500 mm before the end of the casting machine. The starting casting speed is calculated by a null position point, a control unit or by an iteration, where the consideration is plant configuration, actual analysis of material, cooling program of the material, estimated value for the starting casting speed, statement of the inadmissible temperature interval in the bending and directional area, a maximum yield point or maximum flare for preventing the bulging, and actual casting temperature. The actual position of the sump tip is determined after reaching the theoretical position of the sump tip. The adaptation of the edge condition takes place with the actual position of the sump tip and the measured temperature at the discharge of the casting machine, so that the new calculations agree with the measured values. The casting speed is increased until the position of the sump tip of 100 mm before the end of the casting machine. The production contingent is reduced in constant casting speed and logistics of the cooling. The bath mirror frequency is determined during the casting process and the amplitude of the bath mirror variations is compared with a reference value. The temperature model of the energetically favorable solution from the variant is decided during exceeding the reference value, where the variant is reduction of casting speed, increasing of cool water quantity in the secondary cooling, and detection of the surface quality of the material, whether the cooling is increased or reduced. The temperature measurement of the slab is used to verify and to keep the allowable temperature interval in bent-/straightening zone in order to adapt the calculated temperature before entering into the oven.