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Stopper rod flow control system control method for improving stability of liquid level of crystallizer

A control method and crystallizer technology, which are applied in the direction of manufacturing tools, casting melt containers, casting equipment, etc., to achieve the effects of reducing the size of liquid level fluctuations, the incidence of slag inclusion defects and surface cracks, and improving sensitivity

Pending Publication Date: 2022-05-17
SHANGHAI MEISHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen from the above disclosed technical methods and devices that there is no method related to the optimal design of the shape of the stopper rod to improve the flow control accuracy of the stopper rod (to improve the stability of the crystallizer liquid level)

Method used

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  • Stopper rod flow control system control method for improving stability of liquid level of crystallizer
  • Stopper rod flow control system control method for improving stability of liquid level of crystallizer
  • Stopper rod flow control system control method for improving stability of liquid level of crystallizer

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Embodiment 1

[0043] Embodiment 1: see figure 1 , a control method of a stopper flow control system for improving the stability of the crystallizer liquid level, the control method comprising the following steps:

[0044] Step 1: Determination of the typical steel flow of submerged nozzles in the actual production process;

[0045] Theoretically, the determination of the typical steel flow of submerged nozzles in the actual production process is usually calculated by the estimated steel production volume and pouring cycle, but in the actual production process, the steel production volume and pouring cycle are quite different from the design. In order to obtain accurate steel production volume and pouring cycle, the present invention obtains the ratio arrangement diagram of the steel flow ratio through big data analysis on the steel flow rate of the nozzle in the actual production process, and takes the steel flow rate with the highest proportion as a typical steel flow rate. quantity.

...

specific Embodiment

[0071] Specific embodiment: a control method of a stopper rod flow control system that improves the stability of the crystallizer liquid level, the control method includes the following steps:

[0072] It is aimed at slabs under casting conditions with a casting speed ranging from 0.8 to 1.8m / min (the cross section of the crystallizer is 230×900 to 1650mm 2 ).

[0073] Step 1: Determine the typical steel flow of the submerged nozzle;

[0074] The amount of steel passing through the nozzle = the nominal width of the slab × the nominal thickness of the slab × the density of the slab × the casting speed of the continuous casting machine Formula (1)

[0075] Typical steel volume (Q typ ) = MAX{annual steel flow ratio i}, where i is a natural number that is generally a multiple of 0.5t / min steel flow. Formula (2)

[0076] Table 1 Distribution of main steel grades and steel quantities in a factory

[0077] Through steel quantity, t / min 1.0 1.5 2.0 2.5 3.0 3.5 4...

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Abstract

The invention relates to a stopper rod flow control system control method for improving the stability of the liquid level of a crystallizer. The control method comprises the following steps that 1, the typical steel passing amount of a submersed nozzle in the actual production process is determined; 2, determining the optimal steel passing amount of the stopper control system; 3, determining the optimal theoretical opening degree of the stopper control system; step 4, determining the optimal radius of the flow control part of the stopper rod head; and step 5, providing the optimal radius of the flow control part of the stopper rod head to a stopper rod supplier for manufacturing, replacing an existing stopper rod and installing the stopper rod on a tundish, and setting parameters of the opening degree of the stopper rod and the steel passing amount into a PLC (Programmable Logic Controller). According to the technical scheme, the control precision of a stopper rod flow control system is improved by changing the inner cavity shape design of a tundish stopper rod and an upper nozzle and combining the typical steel passing amount, the optimal opening actual performance, a molten steel viscosity correction system and the like on site, and the liquid level fluctuation stability of a corresponding crystallizer reaches the best level.

Description

technical field [0001] The invention relates to a control method, in particular to a control method of a stopper rod flow control system for improving the stability of the crystallizer liquid level, and belongs to the technical field of crystallizer liquid level control. Background technique [0002] Continuous casting has been highly valued by countries all over the world for its unique high efficiency, energy saving and easy automation of the production process, and has been widely used. The stability of the molten steel level in the mold is a prerequisite to ensure the high efficiency of the continuous casting machine and good slab quality. The fluctuation of the liquid level in the mold will cause the mold slag in the mold to be involved in the molten steel to form slag defects, and will also lead to crystallization. Partial inflow of mold slag is not uniform, resulting in surface cracks. The stability of the crystallizer liquid level is poor, which limits the utilizati...

Claims

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Application Information

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IPC IPC(8): B22D11/18B22D41/18
CPCB22D11/18B22D41/18
Inventor 江中块周业连
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD
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