Continuous casting billet secondary cooling dynamic control system

Abstract

The invention provides a secondary cooling mode control system of a continuous casing slab which can change as the change of the technology and can adjust water flow quantity in time, and has stable casting slab setting process and little temperature fluctuating on the surface, and can get excellent casing slab quality. The invention comprises a mathematical module and an increment-type PID control system, the mathematical module substitutes an in-site technological parameter into a non-stationary setting-heat transferring equation, the equation is established on the basis of a structural parameter of a casting machine, solving and calculating are proceeded by the equation, and the equation determines the effect relationship of the changing of the parameter to the surface temperature of the casting slab, the depth of a liquid core, and the terminal position of the freezing point, which dynamically displays the positions of the casting slab temperature field and the freezing end. The increment-type PID control system adjusts water quantity according to calculating the differential value between the temperature field and a target temperature field, temperature difference ratio, and temperature difference accumulation degree. The invention is applicable to the technology control of secondary cooling section of continuous casting.

Description

technical field [0001] The invention relates to the technical field of continuous casting process control, in particular to a dynamic control system for secondary cooling of continuous casting slabs. Background technique [0002] In the continuous casting process, most of the quality problems of the slab are related to the cooling process of the slab, and the main cooling process of the slab is in the secondary cooling section, and the control technology of this section is a key link in the continuous casting process. At present, the secondary cooling control system of continuous casting machines in most domestic iron and steel enterprises is based on the ratio of casting speed or the quadratic ratio mode. Although the function relationship of this technology is simple and it is easy to realize control, this technology mode has great influence on the transmission of slab solidification. The complexity of the thermal process has not been deeply involved, the determination of ...

AI Technical Summary

Problems solved by technology

At present, the secondary cooling control system of continuous casting machines in most domestic iron and steel enterprises is based on the ratio of casting speed or the quadratic ratio mode. Although the function relationship of this technology is simple and it is easy to realize control, this technology mode has great influence on the transmission of slab solidification. The complexity of the thermal process has not been deeply involved, the determination of process parameters depends on experience, the scalability and transplantation are relatively poor, and when the process conditions change during the implementation process, the surface temperature of the slab fluctuates greatly, which cannot meet the needs of modern steel. Enterprises' requirements for quality control of continuous casting slabs

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