Dynamic water amount adjustment method for laminar flow cooling of medium-thickness plate and wide and thick plate considering head-tail temperature deviation

Abstract

The invention provides a dynamic water amount adjustment method for laminar flow cooling of a medium-thickness plate and a wide and thick plate considering head-tail temperature deviation. The steel sheet temperature is detected dynamically according to a certain cycle period by considering the advancing speed of a steel sheet in laminar flow cooling, and the flow of the required cooling water is dynamically calculated according to the newly detected temperature; then, the group number N of valves with the opening degree being 100% and the valve opening degree K of the last group of flow adjustment valves are determined according to the flow, wherein the K is larger than or equal to zero and smaller than or equal to one; and the delay time delta t of flow adjustment is determined according to the valve group number. By means of the dynamic water amount adjustment method, it can be guaranteed that the head and the tail of the steel sheet can be the same in temperature after being cooled, uniformity of product performance is guaranteed, the situation that the head performance is qualified while the tail performance is unqualified, or the tail performance is qualified while the head performance is unqualified is avoided, and controversy about quality is avoided as much as possible.

Description

technical field [0001] The invention relates to a method for adjusting the amount of cooling water in the field of metallurgy. Specifically, in the laminar flow cooling process of medium and thick plates and wide and thick plates, the head and tail of the temperature deviation of the steel plate head and tail are considered in a targeted manner. A method for dynamic adjustment of water volume in laminar flow cooling with temperature deviation. Background technique [0002] After the rolling of medium and heavy plates and wide and heavy plates is completed, most steel types need to be laminarly cooled to improve the performance of the steel plate. like figure 1 The schematic diagram of the laminar flow cooling of the steel plate is shown, and the area enclosed by the box in the figure is set as the laminar flow cooling area. In addition, set the forward direction of the steel plate, the end is A, and the opposite end is B. Let the distance between two adjacent valves be S....

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Problems solved by technology

[0004] However, in the above setting, there is actually a problem, that is, the A end and the B end of the steel plate (assuming that the temperature is T B ) is not the same temperature when entering the laminar cooling zone

Moreover, according to actual testing, when the steel plate is long, the temperature difference between the two can reach 80°C. In this case, if both the head A and the tail B are cooled by 5 sets of water, it is obviously inappropriate, and it will easily lead to uneven performance of the head and tail. phenomenon, which increases the possibility of quality accidents

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