A feed-forward control method for exit temperature of hot rolling finish rolling
A technology of outlet temperature and feedforward control, applied in the direction of temperature control, etc., can solve the problems of poor control accuracy, large amount of blocked scrap, large deviation of finishing rolling model setting, etc.
Active Publication Date: 2020-12-08
ANSTEEL GRP CHAOYANG ANLING STEEL & IRON
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Problems solved by technology
[0003] Existing problems: the original technology adopts constant acceleration control, and the operator manually adjusts the cooling water valve between the racks, resulting in poor control accuracy, and the FDT hit rate is not high, generally reaching about 90%, which seriously affects the performance of hot-rolled products At the same time, due to the inaccurate temperature control, the setting deviation of the finishing rolling model is large, resulting in a large amount of blockage and scrap steel
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[0024] The specific embodiments provided by the present invention will be described in detail below in conjunction with the accompanying drawings.
[0025] A feed-forward control method for the exit temperature of hot rolling and finishing rolling, the control of the exit temperature of hot rolling and finishing rolling includes water spray control; the water spray control includes coarse water spray control and fine water spray control, the coarse water spray control Water spray control is used as feed-forward predictive control; fine-tuned water spray control is used as feedback error correction control;
[0026] The fine-tuned water spray is close to the exit of the rolling mill, and the number N of fine-tuned water sprays is configured; the number M of coarse-tuned water sprays is the total water spray number A minus the fine-tuned water spray number N;
[0027] The feed-forward predictive control method is to correct the predicted finish rolling temperature control error ...
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The invention provides a feedforward control method for hot rolling finishing rolling outlet temperature. A predicted finishing rolling temperature control error is corrected by adjusting coarse adjustment water spray, and finishing rolling inlet pyrometer test data are used for feedforward adjustment of the opening degree of cooling water nozzles between all racks; through drive of a strip current sample section at a finishing rolling inlet, coarse adjustment water spray is adjusted to control the final rolling temperature, and the adjustment amount P is the output quantity of a multivariableinput PID control function with multiple variables being a PID control function. According to the feedforward control method, the final performance and the rolling stability of a product have large correlation with the finishing rolling outlet temperature, the finishing rolling outlet temperature feedforward control function is applied, the finishing rolling outlet temperature control precision level can be effectively improved, and the final rolling product performance and rolling stability are effectively guaranteed.
Description
technical field [0001] The invention relates to the technical field of temperature measurement of hot-rolled strip steel, in particular to a feed-forward control method for the exit temperature of hot-rolled finish rolling. Background technique [0002] The main equipment of the 1700ASP line in the existing iron and steel plant includes: 2 walking heating furnaces, high-pressure water descaling boxes behind the furnaces, 1 four-roll roughing mill with front vertical rolls, scrap ejection device, heat preservation cover, hot coil box, cutting head flying shear, high-pressure water descaling box before finishing rolling, 7 finishing mills, strip laminar cooling device, 2 coilers, coil transportation system, etc. The entrance and exit of the finishing mill are equipped with IMS high-temperature detectors. The maximum rolling speed of the finishing mill can reach 17.86m / s, and the strip threading speed is between 6m / s and 12m / s. The original FDT temperature control adopts the a...
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IPC IPC(8): B21B37/74
CPCB21B37/74
Inventor 王鹏杨志强徐小科裴宝生孙泽硕徐挺于朋王渐灵
Owner ANSTEEL GRP CHAOYANG ANLING STEEL & IRON