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Material melting model-based power supply control method for arc furnace

A technology for power supply control and electric arc furnace, which is used in electrical program control, electric furnace, program control in sequence/logic controllers, etc., and can solve problems such as operating point optimization.

Active Publication Date: 2010-09-15
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the invention patent application only controls the power supply amount and power supply time, and does not optimize the working point (such as power input, arc voltage and current, etc.)

Method used

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  • Material melting model-based power supply control method for arc furnace
  • Material melting model-based power supply control method for arc furnace
  • Material melting model-based power supply control method for arc furnace

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Embodiment Construction

[0065] The specific implementation manners of the present invention will be described in further detail below with reference to the accompanying drawings.

[0066] figure 2 A control flow diagram of a first specific embodiment of judging the smelting end point according to the material melting model of the AC electric arc furnace of the present invention is shown. Such as figure 2 As shown, the control method mainly includes:

[0067] Start timing from time t, set the corresponding active power P at time t+Δt, and take k=0;

[0068] Set the voltage gear to k+1, and set the corresponding arc voltage U k , take i=0;

[0069] Choose working current I i , where I i =I min +(I max -I min )(i-1) / N;

[0070] Use formulas (1) and (2) to calculate power factor cosφ and arc power P a ; the formula is as stated earlier, and P a =3UIcosφ-3I 2 R;

[0071] According to the power factor calculated by the above formulas (1) and (2), judge whether it satisfies the formula (3)...

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Abstract

The invention discloses a material melting model-based power supply control method for an arc furnace. The method combines furnace condition information which represents various scrap steel melting characteristics and is provided by the material melting model with electrical characteristics of the arc furnace; a power supply parameter in the smelting process of the arc furnace is dynamically regulated on line; and a working point with the maximum etaaPa value or the minimum active power is selected from a plurality of current calculated working points based on a material melting model to carry out smelting process so as to accurately judge the smelting end-point of the arc furnace. Through the adoption of the power supply control method of the invention, the change of the furnace condition can be continuously quantificationally tracked and forecast so as to fulfill the aims of improving electric energy efficiency, reducing electric energy consumption, reducing temperature fluctuation of molten steel and preventing overheated molten steel; and the method shortens the smelting time on the premise of guaranteeing to realize a smelting task and can improve the capacity of controlling the smelting end-point and accuracy of judging the smelting end-point.

Description

technical field [0001] The invention relates to a control technology of a metallurgical process, in particular to a power supply control method of an electric arc furnace based on a material melting model in the electric arc furnace steelmaking production process. Background technique [0002] Electric energy is the basic energy source of electric arc furnace smelting, and it is through the control of arc current, voltage and power that electric arc furnace can meet the different needs of different smelting stages. Specifically, the current electric arc furnace power supply operation generally adopts high power input as much as possible within the allowable range to speed up melting, shorten smelting time, and at the same time reduce heat loss in heat transfer. [0003] According to the way of power supply, electric arc furnaces used for smelting include DC electric arc furnaces and AC electric arc furnaces. Because of their different electrical characteristics, the control...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/04C21C5/52H05B7/148
CPCY02P10/20Y02P10/25
Inventor 李青郭亚芬郑皓宇施允
Owner BAOSHAN IRON & STEEL CO LTD
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