A method for controlling the temperature of molten iron in the production process of argon-oxygen refining ferroalloy

A technology of production process and molten iron temperature, applied in the direction of self-adaptive control, general control system, control/regulation system, etc., can solve the problems that the smelting temperature of AOD furnace cannot be measured in real time, and the quality of smelting ferroalloy cannot be guaranteed, and achieve real-time control. Good, simple algorithm, easy to achieve effect

Active Publication Date: 2021-12-14
CHANGCHUN UNIV OF TECH
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Problems solved by technology

[0008] The purpose of the present invention is to provide a method for controlling the temperature of molten iron in the production process of argon-oxygen refining ferroalloy in order to solve the problem that the quality of smelted ferroalloy cannot be guaranteed due to the fact that the smelting temperature of the existing AOD furnace cannot be measured in real time

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  • A method for controlling the temperature of molten iron in the production process of argon-oxygen refining ferroalloy
  • A method for controlling the temperature of molten iron in the production process of argon-oxygen refining ferroalloy
  • A method for controlling the temperature of molten iron in the production process of argon-oxygen refining ferroalloy

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Embodiment Construction

[0028] see Figure 1 to Figure 3 Shown:

[0029] Step 1. First, determine the caliber of the gas supply pipeline according to the smelting tonnage of the AOD furnace, and then select and install the regulating valve and flowmeter according to the caliber of the pipeline. The regulating valve and flowmeter must meet the requirements for gas flow regulation and measurement, and the transmitter adopts 485 communication protocol to simplify the controller hardware circuit design.

[0030] Step 2. Establish the main channel mathematical model and the disturbance channel mathematical model of the influence of disturbance on the main output according to the heat release principle of the oxidation reaction, then establish the auxiliary channel mathematical model according to the operating characteristics of the regulating valve, and finally use the BP neural network method to establish the influence of disturbance on the auxiliary output The perturbed channel mathematical model of . ...

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Abstract

The invention discloses a method for controlling the temperature of molten iron in the production process of argon-oxygen refining ferroalloy. The method comprises the following steps: step 1, establishing an expert control rule table; Estimating the model design as the transfer function of the auxiliary channel; step 4, assuming that the gas source pressure provided by the oxygen and argon storage tanks is constant; step 5, completing the constant flow control of argon in each period, and at the same time, PLC is used as an inference controller to calculate the oxygen The opening of the flow regulating valve is sent to the oxygen flow regulating valve to complete the reasoning control for the main output, and the above process is repeated until the end of smelting is reached. Beneficial effects: it can solve the difficult problem of unmeasurable smelting temperature in the production process of argon-oxygen refining ferroalloy, and realize real-time control of smelting temperature. It can effectively solve the influence of time-varying decarburization rate and uncertainty on control accuracy during the smelting period. This method has a small amount of calculation, a simple algorithm, good real-time control, and is easy to implement.

Description

technical field [0001] The invention relates to a method for controlling the temperature of molten iron, in particular to a method for controlling the temperature of molten iron in the production process of argon-oxygen refining ferroalloy. Background technique [0002] At present, the metallurgical principle of AOD refining technology is to blow a mixed gas of oxygen and inert gas (Ar, N2) into the furnace, and use Ar (or N2) to dilute the partial pressure of CO gas produced by the decarburization reaction, thereby promoting decarburization The reaction proceeds, and inhibits the oxidation of chromium in molten steel. Due to the high refining temperature, long smelting period, violent gas stirring, severe steel slag erosion, large range of pH changes in the furnace smelting cycle, etc., the working conditions in the furnace are very harsh, so the online real-time measurement of the smelting temperature has always been a problem. Real-time control of smelting temperature br...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B13/04
CPCC21C7/068Y02P10/25
Inventor 尤元魏丙坤关常君
Owner CHANGCHUN UNIV OF TECH
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