Steel ladle bottom argon blowing gas flow control device and control method

A technology of argon flow and bottom blowing argon, which is applied in the direction of flow control, flow control using electrical devices, non-electric variable control, etc., can solve the problem that the flow rate of argon gas flow at the bottom of the ladle cannot be automatically and accurately controlled, and reduce manual labor. Strength, improved molten steel quality, and improved reliability

Inactive Publication Date: 2018-07-03

SHANGHAI MEISHAN IRON & STEEL CO LTD

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AI-Extracted Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a control device and control method for the flow rate of argon gas blown at the bottom of the lad...

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Abstract

The invention discloses a steel ladle bottom argon blowing gas flow control device and control method, and solves the technical problem that existing steel ladle bottom argon blowing gas flow cannot be controlled automatically and accurately. The steel ladle bottom argon blowing gas flow control device comprises a camera, a steel ladle, an air brick, an image processing and control center server and an argon gas flow control valve. The camera is arranged above a mouth of the steel ladle; the camera is connected with the image processing and control center server through a cable; the image processing and control center server is connected with the argon gas flow control valve arranged on an argon gas pipeline through a cable; the input end of the argon gas flow control valve is communicatedwith an argon gas source through the argon gas pipeline; the output end of the argon gas flow control valve is communicated with the air brick through the argon gas pipeline; and the air brick is arranged on the bottom portion of the steel ladle. The control device realizes automatic and accurate control of steel ladle bottom argon blowing gas flow, and improves quality of liquid steel.

Application Domain

Flow control using electric means

Technology Topic

Automatic controlLiquid steel +6

Image

Examples

Experimental program(2)

Example Embodiment

[0020] Embodiment 1, the method for controlling the flow of argon blowing at the bottom of a ladle by using the above-mentioned device, includes the following steps:

[0021] 1) The image processing and control center server 4 has a database including the argon flow valve opening, the argon flow range, the argon blowing intensity at the bottom of the ladle and the exposed ratio of molten steel database. The image processing and control center server has a ladle The standard for the ratio of the exposed surface of molten steel to the molten steel surface corresponding to the strong or weak stirring of argon blowing: strong stirring means that the ratio of the exposed area of molten steel to the molten steel surface is 26-75%; weak stirring means that the ratio of the exposed area of molten steel to the molten steel surface is 5-25%; Blowing means that the exposed area of molten steel accounts for more than 75% of the molten steel surface, and no blows are allowed during manipulation; poor mixing means that the exposed area of molten steel accounts for less than 5% of the molten steel surface, and poor mixing is not allowed during manipulation. ;

[0022] 2) According to the needs of molten steel processing, control the image processing and control center server 4 to set the ladle argon blowing strong stirring, and control the image processing and control center server to transmit the ladle 2 argon blowing signal to the argon flow regulating valve 5 through the cable;

[0023] 3) Control the argon flow control valve 5 according to the corresponding table in the image processing and control center server database to automatically adjust the opening of the argon flow control valve to the set value; strong stirring, control the opening of the argon flow control valve to the initial value 40%, argon flow rate is 30m 3 /h, the target value of the exposed area of molten steel is 50%;

[0024] 4) Control the camera 1 to collect images of molten steel and steel slag in the ladle under stirring, and control the camera to transmit the collected image signals to the image processing and control center server through the connection cable;

[0025] 5) Manipulate the image processing and control center server to process the received image signals and calculate that the actual exposed area of molten steel in the ladle accounts for 85% of the molten steel surface area; manipulate the image processing and control center server to calculate the actual molten steel in the ladle The ratio of the exposed area to the area of the molten steel surface is compared with the ratio of the exposed surface of the molten steel to the molten steel surface corresponding to the image processing and the strong stirring of the ladle set in the control center server;

[0026] 6) Control the image processing and control center server to output the valve opening adjustment signal to the argon flow control valve; control the argon flow control valve to adjust the valve opening; strong stirring, the actual exposed area of molten steel accounts for the proportion of the molten steel surface area> 75% Compared with the target value of 50% of the exposed area of molten steel in the area of the molten steel surface, for every 10% increase, the opening of the argon flow control valve is controlled to be reduced by 10% until the actual exposed area of molten steel accounts for the ratio of the molten steel surface area. 50% of the target value.

Example Embodiment

[0027] Embodiment 2, the method for controlling the flow of argon blowing at the bottom of the ladle by using the above-mentioned device, includes the following steps:

[0028] 1) The image processing and control center server 4 has a database including the argon flow valve opening, the argon flow range, the argon blowing intensity at the bottom of the ladle and the exposed ratio of molten steel database. The image processing and control center server has a ladle The standard for the ratio of the exposed surface of molten steel to the molten steel surface corresponding to the strong or weak stirring of argon blowing: strong stirring means that the ratio of the exposed area of molten steel to the molten steel surface is 26-75%; weak stirring means that the ratio of the exposed area of molten steel to the molten steel surface is 5-25%; Blowing means that the exposed area of molten steel accounts for more than 75% of the molten steel surface, and no blows are allowed during manipulation; poor mixing means that the exposed area of molten steel accounts for less than 5% of the molten steel surface, and poor mixing is not allowed during manipulation. ;

[0029] 2) According to the needs of molten steel processing, control the image processing and control center server 4 to set the ladle to blow argon weakly, and control the image processing and control center server to transmit the ladle 2 argon signal to the argon flow regulating valve 5 through the cable;

[0030] 3) Control the argon flow regulating valve 5 automatically adjust the opening of the argon flow regulating valve to the set value according to the corresponding table in the database of the image processing and control center server; weak stirring, control the initial value of the opening of the argon flow regulating valve 10%, argon flow rate is 15m 3 /h, the target value of the exposed area of molten steel is 15%;

[0031] 4) Control the camera 1 to collect images of molten steel and steel slag in the ladle under stirring, and control the camera to transmit the collected image signals to the image processing and control center server through the connection cable;

[0032] 5) Control the image processing and control center server to process the received image signals and calculate the actual molten steel exposed area in the ladle to account for 11% of the molten steel surface area; control the image processing and control center server to calculate the actual molten steel in the ladle The ratio of the exposed area to the area of the molten steel surface is compared with the standard of the ratio of the exposed surface of the molten steel to the molten steel surface corresponding to the image processing and the weak stirring of the ladle set in the control center server;

[0033] 6) Control the image processing and control center server to output the valve opening adjustment signal to the argon flow control valve; control the argon flow control valve to adjust the valve opening; weak stirring, the actual exposed area of molten steel accounts for less than 15% of the molten steel surface area , Compared with the target value of 15%, which is the ratio of the exposed area of molten steel to the area of the molten steel surface, for every 2% decrease, the opening of the argon flow control valve is controlled to increase by 1% until the actual exposed area of molten steel accounts for the ratio of the molten steel surface area. The target value is 15%.

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Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

Improve the quality of molten steel
Reduce manual labor intensity

Steel ladle bottom argon blowing gas flow control device and control method

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Image

Examples

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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