Method for controlling molten iron temperature in production process of argon-oxygen refining ferroalloy
A technology of production process and molten iron temperature, applied in the direction of improving process efficiency, improving energy efficiency, 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 achieves good real-time control and simple algorithm. , the effect of a small amount of calculation
Active Publication Date: 2020-10-13
CHANGCHUN UNIV OF TECH
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[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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[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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The invention discloses a method for controlling molten iron temperature in production process of argon-oxygen refining ferroalloy. The method comprises the steps that step one, an expert control ruletable is established; step two, the smelting time of furnace I is divided into five sub-intervals; step three, an estimation model is designed as a transfer function of an auxiliary channel; step four, the pressure of an gas source provided by oxygen and argon storage tanks is assumed to be constant; step five, the constant flow control of argon in each period is completed, and at the same time,a PLC is used as an inference controller to calculate the opening degree of an oxygen flow control valve and the opening degree is sent to the oxygen flow control valve to complete the inference control for a main output, and the above process is repeated until the end of the smelting. The method has the beneficial effects that the method can solve the problem of unpredictable smelting temperaturein the production process of the argon-oxygen refining ferroalloy, and realize real-time control of smelting temperature. The influence of time-varying and uncertainty of the decarburization rate during the smelting period on the control accuracy can be effectively solved. The method has a small amount of calculation, simple algorithm, good real-time control, and easy implementation.
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...
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Login to View More IPC IPC(8): C21C7/068
CPCC21C7/068Y02P10/25
Inventor 尤元魏丙坤关常君
Owner CHANGCHUN UNIV OF TECH