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Method for optimizing convectional heat exchange confident of cooling water in continuous casting secondary cooling zone

A convective heat transfer coefficient and optimization method technology, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve the problems of heat transfer lag, cumbersome process, and consumption, so as to reduce the influence of human factors and avoid cumbersome process, optimization and high efficiency

Inactive Publication Date: 2015-02-04
DALIAN UNIV OF TECH
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Problems solved by technology

The disadvantage of this method is that the thermal conductivity of high-temperature resistant materials is poor, and the heat transfer is relatively "lag", which directly affects the response speed and measurement accuracy of the galvanic temperature measurement; in addition, the wire layout distance is long, and the process of billet dissection is cumbersome. , is a consumable, destructive test method that is expensive to measure

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  • Method for optimizing convectional heat exchange confident of cooling water in continuous casting secondary cooling zone
  • Method for optimizing convectional heat exchange confident of cooling water in continuous casting secondary cooling zone
  • Method for optimizing convectional heat exchange confident of cooling water in continuous casting secondary cooling zone

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Embodiment

[0067] The arc-shaped slab continuous casting machine of a domestic steel plant has a caster radius of 10.75m, a metallurgical length of 28.83m, and a mold length of 900mm. The secondary cooling section of the casting machine is divided into 8 areas. The distance from the meniscus of each cooling area The distances and lengths are shown in Table 1.

[0068] Table 1 The distance and length of each cooling zone from the meniscus

[0069]

[0070] In production, the casting machine is used to cast a steel grade with a section of 2450mm×320mm, the liquid level is 800mm, the water volume of the wide and narrow sides of the mold is 5800L / min and 650L / min respectively, and the temperature difference between the water entering and leaving the mold is 4.9°C. The liquidus and solidus temperatures of the steel grades are 1514.4°C and 1453.3°C, respectively, and the casting superheat is 30°C. The chemical composition of the steel grades is shown in Table 2.

[0071] Table 2 Chemical c...

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Abstract

The invention relates to a method for optimizing convectional heat exchange confident of cooling water in continuous casting secondary cooling zones and belongs to the technical field of ferrous metallurgy continuous casting. On the basis that the surface temperature of cast blanks at each secondary cooling zone outlet of a continuous casting machine is detected, a particle swarm optimization algorithm and cast blank solidification heat transfer numerical calculation are organically combined, the convectional heat exchange coefficient of each cooling zone is used as a target parameter for particle swarm optimization, the value range of the convectional heat exchange coefficient is estimated through an empirical heat transfer coefficient formula, a solution-focused interval of each particle position is set accordingly, then the applicable value of each particle is calculated according to a heat transfer numerical model and an actually measured temperature result, and the positions of the particles are corrected and repetitively iterated till an optimization result which satisfies a convergence condition is obtained. The method for optimizing convectional heat exchange confident of cooling water in continuous casting secondary cooling zones has the advantages that the optimization result is accurate, the efficiency is high, information such as cast blank temperature distribution, liquid / solid faction and solidified tail end position which are more compliant with actual working conditions can be calculated by putting the optimized convectional heat transfer coefficient into the heat transfer numerical model, and the improvement of cast blank quality is facilitated.

Description

technical field [0001] The invention relates to the secondary cooling technology of continuous casting slabs, in particular to a method for optimizing the convective heat transfer coefficient of cooling water in the secondary cooling zone of continuous casting, and belongs to the technical field of continuous casting of iron and steel metallurgy. Background technique [0002] In the continuous casting process, the secondary cooling control is an important factor affecting the quality of the continuous casting slab. At present, the dynamic control method of secondary cooling water based on the numerical model of heat transfer and solidification is widely used in production, and the cooling water volume is adjusted according to the surface temperature of the slab calculated by the model and the target temperature set by each secondary cooling circuit. Whether it depends on whether the calculation results of the model can faithfully reflect the actual temperature of the slab su...

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Application Information

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IPC IPC(8): G06F17/50B22D11/22
Inventor 王旭东姚曼
Owner DALIAN UNIV OF TECH
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