System and method for intelligently controlling temperature of internal arc angle part in straightening region of wide and thick plate blank

Abstract

The invention discloses a system and a method for intelligently controlling temperature of an internal arc angle part in a straightening region of a wide and thick plate blank, and belongs to the technical field of control over continuously casting secondary cooling temperature of ferrous metallurgy. The system comprises a temperature measurement device, a flow guide device and a control system, wherein the temperature measurement device consists of a temperature measurement pipe and an infrared temperature measurement probe; the infrared temperature measurement probe is arranged at the upperend of the temperature measurement pipe; the upper end of the temperature measurement pipe is communicated with a compressed air pipeline; the top end of a supporting frame connecting rod of the flowguide device is connected with a horizontal supporting frame; the bottom end of the supporting frame connecting rod is connected with a cooling water collection flow guide pipe; the temperature measurement pipe is connected with a temperature measurement device hydraulic pusher; the horizontal supporting frame of the flow guide device is connected with a flow guide device hydraulic pusher; and the hydraulic pushers are connected with the control system. The method comprises the following steps of: taking an actual temperature measurement result on the surface of the internal arc angle part inthe straightening region of a continuously cast blank as a feedback of secondary cooling intensity; and dynamically adjusting a spraying width by adjusting the position of the flow guide device according to a difference between the actual measured temperature and the temperature of the target surface, so that an aim of precisely controlling the temperature of the internal arc angle part of the continuously cast blank entering the straightening region is fulfilled.

Description

technical field [0001] The invention belongs to the technical field of continuous casting secondary cooling temperature control of iron and steel metallurgy, in particular to a system and method for intelligently and accurately controlling the temperature of the inner arc corner of the slab in the secondary cooling straightening area of ​​a wide-thick slab continuous caster. Control the temperature at which the inner arc corner of the continuous casting slab of wide and thick plate enters the straightening zone. Background technique [0002] Taking the production of microalloy steels containing Nb and B as typical representatives by continuous casting, the micro-transverse cracks that widely occur on the surface of the inner arc corner of wide and thick slabs are restricting the stable and efficient production of high-quality continuous casting slabs by wide and thick slab continuous casters. The universal problem seriously affects the final quality of the product, which gre...

AI Technical Summary

Problems solved by technology

However, since most wide and thick plate continuous casting machines are capable of producing slabs with multiple width specifications, in the actual continuous casting production process, it is necessary to frequently switch the width of the continuous casting section, and two independent water supply circuits cannot meet the requirements of casting with multiple section widths. Billet cooling requirements; when the billet width is adjusted from a large width specification to a smaller width section, affected by the flow characteristics of the nozzle, the amount of cooling water sprayed from the spray pipe to the surface of the corner of the continuous casting billet increases, and the continuous casting billet The corner cooling is still significant, and the micro-transverse cracks on the inner arc corner surface of the continuous casting slab are still difficult to control. Therefore, the width cutting control system has certain application limitations

In addition, to introduce this system to the wide and thick plate continuous casting machine that is not equipped with the secondary cooling width cutting control system, it is necessary to completely renovate the water supply circuits of the secondary cooling zones of the continuous casting machine. The quantity also needs to be re-optimized, and the water supply circuit of the existing wide-thick slab continuous casting machine is generally solidified inside the fan-shaped section, and the remodeling of the water supply circuit is bound to carry out structural transformation on the fan-shaped section, which not only affects the production rhythm, but also costs more. high

The coordination of two sets of independent water supply circuits also requires the redevelopment of the secondary cooling water meter, and the development cycle of the precise secondary cooling water distribution control system is long and very complicated

[0005] In recent years, in order to solve the problem of excessive cooling at the corners of the continuous casting billet, some iron and steel enterprises whose conventional wide and thick plate continuous casting machines are not equipped with the secondary cooling width cutting control system, in addition to developing the secondary cooling and weak cooling technology, they also adopt the plugging of the casting strand part The method of edge nozzles in the arc section and the fan section of the straightening section greatly reduces the cooling intensity of the corner area of ​​the continuous casting slab, achieves the purpose of effectively increasing the temperature of the corner of the continuous casting slab, and also solves the problem of continuous casting to a certain extent. Frequent micro-transverse cracks at the inner arc corner of the slab; however, due to the large-scale blockage of the spray pipe at the edge of the strand, the cooling of the continuous casting slab in the lateral direction of the strand is extremely uneven, and the width of the continuous casting slab is 1 / 4 The temperature of the slab shell is too high, causing the central segregation of the continuous casting slab to intensify, and deteriorating the internal quality of the continuous casting slab

In addition, the support rolls in the segment corresponding to the blocked spray pipes are often affected by the lack of water film lubrication protection on the surface of the rolls and the excessive temperature on the surface of the continuous casting slab, resulting in the mixture of mold slag and iron oxide scale on the surface of the continuous casting slab. , affecting the normal operation of the equipment

[0006] In addition, Chinese patent CN1958193A discloses a continuous casting slab surface target temperature monitoring and analysis method and its device, which realizes the online recording of temperature measurement results and process data, and solves the problem that the existing slab surface temperature monitoring cannot be compared with parameters such as continuous casting process. However, the slab surface temperature monitoring system of this invention cannot reversely control the slab temperature field distribution according to the change of the slab surface temperature.

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