Method for judging corrosion state of melting channel of groove type electric induction furnace

Abstract

The invention relates to the technical field of metallurgical furnace electrical automation, in particular to a groove type electric induction furnace melting groove erosion state judgment method, and solves the problem that in the existing electric induction furnace melting groove erosion state judgment process, whether a furnace body inductor is replaced or not is determined only according to parameter changes such as current or power of an electric furnace, and the judgment result is not accurate. The judgment on the corrosion amount of the melting channel is inaccurate, and the overall working efficiency of the electric induction furnace is low. According to the judgment method, function change relations between resistance and reactance of the electric induction furnace melting channel and the cross section area of the melting channel and between the melting channel and an induction coil are combined, and corresponding current, voltage and power parameters are combined; according to the method, the corresponding cross sectional area of the melting channel and the change value of the distance between the melting channel and the induction coil within the preset range of the resistance and reactance change ratio are accurately calculated, so that the real-time corrosion amount of the electric furnace melting channel is accurately reflected, timely replacement of the inductor is realized, damage to the electric furnace is effectively avoided, and the working efficiency and safety of the electric furnace are improved.

Description

Technical Field

[0001] The invention relates to the technical field of electrical automation of metallurgical furnaces, and in particular to a method for determining the corrosion state of a groove of a groove-type induction furnace. Background Art

[0002] The inductor is the core component of the groove induction furnace. During the production process, the shape of the groove of the groove induction furnace will inevitably change under the erosion of the high-temperature copper liquid and the adhesion of the slag. The electrical parameters such as the furnace impedance value will also change accordingly. The service life of the electric furnace depends to a large extent on the corrosion condition of the inductor groove. The traditional method is to judge whether the inductor should be replaced based on parameters such as the current or power of the electric furnace. This method is relatively rough and cannot reflect the overall condition of the groove corrosion. Improper monitoring of the continuously corroded groove can easily cause equipment accidents such as furnace leakage, which can seriously cause the furnace body to be scrapped and the entire production line to be shut down, thereby causing huge economic losses to the production company. Summary of the invention

[0003] The present invention provides a method for determining the corrosion state of a groove in a groove induction furnace, so as to solve the problem that the judgment of the corrosion amount of the groove is inaccurate, resulting in low overall working efficiency of the induction furnace.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions: A method for determining the corrosion state of a groove induction furnace, comprising the following steps: Step 1: The equivalent resistance of the induction furnace trough R and the cross-sectional area of ​​the melt channel S Determine the functional relationship as , reactance of induction furnace channel X The distance between the melting groove and the induction coil L The functional relationship is determined as and through the resistor R and reactance X The data changes reflect the deformation of the induction furnace molten groove.

[0005] Step 2: According to the current in the induction furnace control program I ,Voltage U and power P The electrical parameter values ​​are used to calculate the resistance of the induction furnace channel. R and reactance X Value, that is , , thus deriving , .

[0006] Step 3: Preset the cross-sectional area of ​​the induction furnace molten groove S,resistance R Reactance X The initial change state point is , and as the erosion process of the melt groove progresses, the initial erosion value is recorded as At this time, the resistance ratio of the initial value of the molten groove corrosion and its initial change state point is recorded as , the reactance ratio is recorded as .

[0007] Step 4: As the induction furnace groove erodes, record the cross-sectional area of ​​the groove at a preset frequency. S ,resistance R Reactance X The change state point is , at this time the change ratio of the resistance of the melting groove , reactance X The change rate .

[0008] Step 5: Preset the range of the melting channel resistance change ratio to 80% R0 ≤ Rx ≤130% R0 , the range of reactance change ratio is 80% X0 ≤ Xx ≤130% X0 , within the range of the resistance change ratio and reactance change ratio, the real-time current corresponding to step 2 I ,Voltage U and power P Numerical calculation of the corresponding cross-sectional area of ​​the melt channel S The distance between the melting groove and the induction coil L The value of the groove can be used to determine the change in the amount of molten groove erosion.

[0009] The present invention has the following beneficial effects: The present invention combines the induction furnace melting channel resistance R and reactance X Respectively with the cross-sectional area of ​​the melt channel S And the distance between the melting groove and the induction coil L Functional change relationship and , combined with the corresponding current I ,Voltage U and power P The electrical parameter values ​​can be used to accurately calculate the resistance of the furnace molten channel. R and reactance X Change ratio range 80% R0 ≤ Rx ≤130% R0 80% X0 ≤ Xx≤130% X0 The corresponding cross-sectional area of ​​the molten groove is S And the distance between the melting groove and the induction coil L The real-time value of the induction furnace can accurately reflect the real-time erosion of the furnace groove, ensure the timely replacement of the furnace induction body, effectively avoid the damage of the furnace, and thus improve the overall working efficiency and operation safety of the induction furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a schematic diagram of the cross-section of the furnace lining at the melting groove of an induction furnace.

[0011] Figure 2 is the induction furnace channel resistance R Graph.

[0012] Figure 3 Induction furnace channel reactance Xt Graph.

[0013] The meanings of the reference numerals are as follows: 1. Induction furnace; 2. Inner erosion surface; 3. Outer erosion surface; 4. Deposition and adhesion of slag; 5. Melting groove; 6. Induction coil; S , cross-sectional area of ​​the melt channel; L , the distance between the melting groove and the induction coil. DETAILED DESCRIPTION

[0014] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0015] Example 1 The 5-ton copper melting furnace produced by Shanghai Xibo Industrial Furnace Company is a groove induction furnace. The rated power of the induction body is 600kw and the rated voltage is 525V. Under normal operation of the induction body, the melting groove 5 expands uniformly around it. At this time, due to the cross-sectional area of ​​the melting groove S Increase, resistance R When the molten groove 5 erodes toward the inner erosion surface 2, the distance between the molten groove and the induction coil L Reduced, the reactance of the melting groove 5 X When the molten groove erodes toward the outer erosion surface 3, the distance between the molten groove and the induction coil L Increase, channel reactance X Increase; when high melting point compounds appear in the groove and adhere to the surface of the refractory material, the cross-sectional area of ​​the melting groove S becomes smaller, and the resistance R The value increases.

[0016] A method for determining the corrosion state of a groove induction furnace of a 5-ton copper melting furnace comprises the following steps: Step 1: The equivalent resistance of the induction furnace troughR and the cross-sectional area of ​​the melt channel S Determine the functional relationship as , reactance of induction furnace channel X The distance between the melting groove and the induction coil L The functional relationship is determined as and through the resistor R and reactance X The data changes reflect the deformation of the induction furnace molten groove.

[0017] Step 2: According to the current in the induction furnace control program I ,Voltage U and power P The electrical parameter values ​​are used to calculate the resistance of the induction furnace channel. R and reactance X Value, that is , , thus deriving , .

[0018] Step 3: Preset the cross-sectional area of ​​the induction furnace molten groove S ,resistance R Reactance X The initial change state point is , and as the erosion process of the melt groove progresses, the initial erosion value is recorded as At this time, the resistance ratio of the initial value of the molten groove corrosion and its initial change state point is recorded as , the reactance ratio is recorded as .

[0019] Step 4: As the induction furnace groove erodes, record the cross-sectional area of ​​the groove at a preset frequency. S ,resistance R Reactance X The change state point is , at this time the change ratio of the resistance of the melting groove , reactance X The change rate .

[0020] Step 5: Preset the range of the melting channel resistance change ratio to 80% R0 ≤ Rx ≤130% R0 , the range of reactance change ratio is 80% X0 ≤ Xx ≤130% X0 , within the range of the resistance change ratio and reactance change ratio, the real-time current corresponding to step 2 I ,Voltage U and power PNumerical calculation of the corresponding cross-sectional area of ​​the melt channel S The distance between the melting groove and the induction coil L The value of the groove can be used to determine the change in the amount of molten groove erosion.

[0021] Step 6: Finally, record the resistance of the melting channel according to the preset frequency of days R and reactance X , and plot the value of Figure 2 The resistance shown R Graphs and Figure 3 The reactance shown Xt Curve diagram, verify the corresponding cross-sectional area of ​​the molten groove in step 5 S The distance between the melting groove and the induction coil L The accuracy of numerical calculations.

[0022] The resistance R In the curve chart, the horizontal axis indicates the number of days recorded, and the vertical axis indicates the resistance R The ratio of change of reactance Xt In the curve chart, the horizontal axis indicates the number of days recorded, and the vertical axis indicates the reactance X The rate of change.

[0023] In the figure R0 and X0 They are the reactance and resistance values ​​of the inductor when it is activated. It can be seen from the figure that during the 27 days of operation of the inductor, as the slag accumulates and blocks the molten groove, the cross-sectional area of ​​the molten groove S Continuously decreases, making the melting channel resistance R The value keeps increasing. At the same time, since the molten groove starts to corrode from the outer erosion surface 3, the distance between the molten groove and the induction coil L Continuously increasing, so that the channel reactance X Gradually increases, and when the sensor runs to the 27th day, when the resistance R The value increases to 129% of the initial value, and the reactance X When it increases to 119% of the initial value, the cross-sectional area of ​​the molten groove is reduced by flushing the slag in the molten groove with high-speed power transmission. S At the same time, the molten groove gradually starts to corrode from the inner erosion surface 2, resulting in the distance between the molten groove and the induction coil L Continuously decreases, so that the resistance R Gradually reduce the reactance X The value continues to decrease and tends to be normal, making R and X The values ​​reached 79% and 87% of the starting values ​​respectively, so it was necessary to stop the furnace and replace the induction body to ensure the safe and efficient operation of the induction furnace.

Claims

1. A method for determining the corrosion state of a groove induction furnace, characterized in that: The following steps are involved: Step 1: The equivalent resistance of the induction furnace trough R and the cross-sectional area of ​​the melt channel S Determine the functional relationship as , reactance of induction furnace channel X The distance between the melting groove and the induction coil L The functional relationship is determined as and through the resistor R and reactance X The data changes reflect the deformation of the induction furnace molten groove; Step 2: According to the current in the induction furnace control program I ,Voltage U and power P The electrical parameter values ​​are used to calculate the resistance of the induction furnace channel. R and reactance X Value, that is , , thus deriving , ; Step 3: Preset the cross-sectional area of ​​the induction furnace molten groove S ,resistance R Reactance X The initial change state point is , and as the erosion process of the melt groove progresses, the initial erosion value is recorded as At this time, the resistance ratio of the initial value of the molten groove corrosion and its initial change state point is recorded as , the reactance ratio is recorded as ; Step 4: As the induction furnace groove erodes, record the cross-sectional area of ​​the groove at a preset frequency. S ,resistance R Reactance X The change state point is , at this time the change ratio of the resistance of the melting groove , reactance X The change rate ; Step 5: Preset the range of the melting channel resistance change ratio to 80% R0 ≤ Rx ≤130% R0 , the range of reactance change ratio is 80% X0 ≤ Xx ≤130% X0 , within the range of the resistance change ratio and reactance change ratio, the real-time current corresponding to step 2 I ,Voltage U and power P Numerical calculation of the corresponding cross-sectional area of ​​the melt channel S The distance between the melting groove and the induction coil L The value of the groove can be used to determine the change in the amount of molten groove erosion.

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