Control Method and Control Device for Submerged Arc Electric Furnace

Abstract

The present disclosure provides a control method and a control device for a submerged arc electric furnace, relating to the technical field of smelting. The control method includes: moving the electrode within a preset range with a preset step length and detecting the actual power of the electrode in real time; calculating the fluctuation parameter of the electrode in real time according to the actual power and the preset power; controlling the electrode to stop moving when the fluctuation parameter is less than the fluctuation threshold, and when the fluctuation parameter is not less than the fluctuation threshold, stopping the electrode at the position where the minimum value of the fluctuation parameter appears within the preset range, and taking the position where the electrode stops as the target position; detecting the actual voltage value and the actual current value of the electrode at the target position, and calculating the operating voltage of the electrode according to the actual voltage value, the actual current value and the preset power; adjusting the voltage grade according to the operating voltage so that the voltage grade matches the operating voltage. The control method and the control device of the present disclosure can reduce power fluctuation.

Description

Technical Field

[0001] The present disclosure relates to the technical field of smelting, and in particular, to a control method for a submerged arc electric furnace and a control device for a submerged arc electric furnace. Background Art

[0002] A submerged arc electric furnace is an important smelting device, mainly using the arc thermal effect to smelt metals and other materials. During the electric furnace smelting process, the charge at the end of the electric furnace continuously melts, causing the contact situation between the electrode and the charge to change continuously, resulting in a large fluctuation in the electrode impedance, and further increasing the power fluctuation amplitude. Such a large power fluctuation will impact the power grid, affect the power stability, and at the same time affect the product quality.

[0003] Currently, the electrode power is mainly adjusted by a control method of electrode power (impedance or current) feedback regulation. However, due to the continuous change of the contact situation between the electrode and the charge inside the electric furnace, the electrode often operates at an unsatisfactory position. The passive control method based on feedback regulation is blind during the regulation process and has a poor regulation effect.

[0004] It should be noted that the information disclosed in the above background art section is only used to enhance the understanding of the background of the present disclosure, and thus may include information that does not constitute the prior art known to those of ordinary skill in the art. Summary of the Invention

[0005] The purpose of the present disclosure is to overcome the above deficiencies in the prior art, and provide a control method for a submerged arc electric furnace and a control device for a submerged arc electric furnace, which can reduce power fluctuations, make the electrode always be in a better contact area, have a simple operation, obvious regulation effect, and high regulation efficiency.

[0006] According to one aspect of the present disclosure, a control method for a submerged arc electric furnace is provided. The submerged arc electric furnace includes an electrode and a charge, and the end of the electrode is inserted into the charge. The control method includes:

[0007] Moving the electrode within a preset range with a preset step size, and detecting the actual power of the electrode in real time;

[0008] Calculating the fluctuation parameter of the electrode in real time according to the actual power and the preset power;

[0009] When the fluctuation parameter is less than the fluctuation threshold, controlling the electrode to stop moving; when the fluctuation parameter is not less than the fluctuation threshold, stopping the electrode at the position where the minimum value of the fluctuation parameter appears in the preset range, and taking the position where the electrode stops as the target position;

[0010] Detect the actual voltage value and actual current value of the electrode at the target position, and calculate the operating voltage of the electrode according to the actual voltage value, the actual current value, and a preset power.

[0011] Adjust the voltage level according to the operating voltage so that the voltage level matches the operating voltage.

[0012] In an exemplary embodiment of the present disclosure, the fluctuation parameter is calculated by a first formula, and the first formula is:

[0013]

[0014] where σ is the fluctuation parameter, P n is the actual power, P set is the preset power, N is the number of detections, and N is an integer greater than 1.

[0015] In an exemplary embodiment of the present disclosure, when the fluctuation parameter is less than a fluctuation threshold, control the electrode to stop moving. When the fluctuation parameter is not less than the fluctuation threshold, stop the electrode at the position where the minimum value of the fluctuation parameter appears within the preset range, and take the position where the electrode stops as the target position, including:

[0016] Compare the size of the fluctuation parameter with the fluctuation threshold. When the fluctuation parameter is less than the fluctuation threshold, control the electrode to stop moving so that the electrode stops at the position where the fluctuation parameter is less than the fluctuation threshold.

[0017] When the fluctuation parameter is greater than or equal to the fluctuation threshold, move the electrode again within the preset range according to the preset step size, and recalculate the fluctuation parameter at the position where the electrode is located after each movement until the movement range of the electrode covers the preset range, and take the position where the minimum value of the fluctuation parameter appears during the movement as the target position, and stop the electrode at the target position.

[0018] In an exemplary embodiment of the present disclosure, the value range of the preset step size is 0 mm to 200 mm.

[0019] In an exemplary embodiment of the present disclosure, the control method further includes:

[0020] After standing at the target position for a time T, re-detect the fluctuation parameter, and when the fluctuation parameter is greater than or equal to the fluctuation threshold, move the electrode according to the preset step size so that the electrode stops at the next target position.

[0021] Detect the actual voltage value and actual current value of the electrode at the next target position, and calculate the operating voltage of the electrode at the next target position according to the actual voltage value, the actual current value, and a preset power.

[0022] Adjust the voltage level according to the operating voltage at the next target position so that the voltage level matches the operating voltage at the next target position.

[0023] In an exemplary embodiment of the present disclosure, the operating voltage is calculated according to a second formula, and the second formula is:

[0024]

[0025] where U set is the operating voltage of the electrode, U m is the actual voltage value of the electrode, I m is the actual current value of the electrode, and P set is the preset power.

[0026] In an exemplary embodiment of the present disclosure, a control component is used to control a driving component to drive the electrode to move within the preset range with the preset step size.

[0027] According to one aspect of the present disclosure, a control device for a submerged arc furnace is provided. The submerged arc furnace includes an electrode and furnace charge, and an end of the electrode is inserted into the furnace charge. The control device includes:

[0028] A driving component for driving the electrode to move within a preset range with a preset step size;

[0029] A detection component for detecting in real time the actual voltage value, actual current value, actual power, and position of the electrode;

[0030] A calculation component for calculating in real time the fluctuation parameter of the electrode according to the actual power and the preset power; and for calculating the operating voltage of the electrode according to the actual voltage value, the actual current value, and the preset power;

[0031] A control component for controlling the electrode to stop moving when the fluctuation parameter is less than a fluctuation threshold, and when the fluctuation parameter is not less than the fluctuation threshold, stopping the electrode at the position where the minimum value of the fluctuation parameter appears within the preset range, and taking the position where the electrode stops as the target position;

[0032] An adjustment component for adjusting the voltage level according to the operating voltage so that the voltage level matches the operating voltage.

[0033] In an exemplary embodiment of the present disclosure, the value range of the preset step size is 0 mm to 200 mm.

[0034] In an exemplary embodiment of the present disclosure, the control component is used to control the driving component to drive the electrode to move within the preset range at the preset step size.

[0035] The control method of the submerged arc furnace and the control device of the submerged arc furnace according to the present disclosure can find the area where the electrode has good contact with the charge by actively moving the electrode, thereby keeping the impedance of the electrode at a relatively small fluctuation level. At the same time, by changing the voltage level to match the operating voltage of the target position, the actual power of the electrode can be ensured to be controlled within a preset value. During this process, the actual power of the electrode can be detected in real time, the fluctuation parameters of the electrode can be calculated in real time, and the fluctuation parameters can be compared with the fluctuation threshold. When the fluctuation parameter is less than the fluctuation threshold, the electrode stops moving to make the electrode within an acceptable power fluctuation range. When the fluctuation parameter is greater than or equal to the fluctuation threshold, the electrode stops at the position where the minimum value of the fluctuation parameter appears within the preset range, so that the electrode is at the position with the smallest power fluctuation within the preset range, thereby reducing the power fluctuation, making the electrode always in a better contact area, with simple operation, and can be adjusted in real time according to the calculated data, the adjustment effect is obvious, and the adjustment efficiency is high.

[0036] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The drawings here are incorporated into the specification and constitute a part of this specification, showing the embodiments consistent with the present disclosure, and are used together with the specification to explain the principles of the present disclosure. Obviously, the drawings in the following description are only some embodiments of the present disclosure. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0038] Figure 1 It is a flowchart of the control method of the submerged arc furnace according to the embodiment of the present disclosure.

[0039] Figure 2 It is a schematic structural diagram of the control device of the submerged arc furnace according to the embodiment of the present disclosure.

[0040] Figure 3 is Figure 1 the flowchart of step S110 in

[0041] Figure 4 It is a schematic composition diagram of the control device of the submerged arc furnace according to the embodiment of the present disclosure.

[0042] Figure 5 This is a schematic diagram of the control method for a submerged arc electric furnace according to an embodiment of the present disclosure.

[0043] In the figure: 100 is a control device for the submerged arc electric furnace; 101 is an electrode; 102 is furnace charge; 1 is a driving assembly; 2 is a detection assembly; 3 is a calculation assembly; 4 is a control assembly; 5 is an adjustment assembly. Specific Embodiments

[0044] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be more complete and comprehensive, and will fully convey the concept of the example embodiments to those skilled in the art. The features, structures, or characteristics described may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of the embodiments of the present disclosure. However, those skilled in the art will realize that the technical solutions of the present disclosure can be practiced without one or more of the specific details, or other methods, components, devices, steps, etc. may be used. In other cases, well-known technical solutions are not shown or described in detail to avoid obscuring the various aspects of the present disclosure.

[0045] In addition, the accompanying drawings are only schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus repeated descriptions thereof will be omitted. Some of the block diagrams shown in the drawings are functional entities and do not necessarily correspond to physically or logically independent entities. These functional entities can be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0046] The terms "the" and "said" are used to indicate the presence of one or more elements / components / etc.; the term "including" is used to mean an open inclusion and means that there may be additional elements / components / etc. in addition to the listed elements / components / etc. The terms "first", "second", and "third" are used only as labels and are not a limitation on the quantity of their objects.

[0047] An embodiment of the present disclosure provides a control method for a submerged arc electric furnace, wherein the submerged arc electric furnace includes an electrode and furnace charge, and the end of the electrode is inserted into the furnace charge, as Figure 1 shown, the control method may include:

[0048] Step S110, moving the electrode within a preset range at a preset step size and detecting the actual power of the electrode in real time;

[0049] Step S120: Calculate the fluctuation parameter of the electrode in real time according to the actual power and the preset power.

[0050] Step S130: When the fluctuation parameter is less than the fluctuation threshold, control the electrode to stop moving. When the fluctuation parameter is not less than the fluctuation threshold, stop the electrode at the position where the minimum value of the fluctuation parameter appears in the preset range, and use the position where the electrode stops as the target position.

[0051] Step S140: Detect the actual voltage value and actual current value of the electrode at the target position, and calculate the operating voltage of the electrode according to the actual voltage value, the actual current value and the preset power.

[0052] Step S150: Adjust the voltage level according to the operating voltage so that the voltage level matches the operating voltage.

[0053] The control method of the submerged arc furnace of the present disclosure can find the area where the electrode has good contact with the furnace charge by actively moving the electrode, and thus can keep the impedance of the electrode at a relatively small fluctuation level. At the same time, by changing the voltage level to make the voltage level match the operating voltage at the target position, the actual power of the electrode can be ensured to be controlled at the preset value. During this process, the actual power of the electrode can be detected in real time, the fluctuation parameter of the electrode can be calculated in real time, and the fluctuation parameter can be compared with the fluctuation threshold. When the fluctuation parameter is less than the fluctuation threshold, the electrode is stopped from moving so that the electrode is within an acceptable power fluctuation range. When the fluctuation parameter is greater than or equal to the fluctuation threshold, the electrode is stopped at the position where the minimum value of the fluctuation parameter appears in the preset range so that the electrode is at the position with the smallest power fluctuation in the preset range, thereby reducing the power fluctuation, making the electrode always in a better contact area, with simple operation, and being able to perform real-time adjustment according to the calculated data, having obvious adjustment effect and high adjustment efficiency.

[0054] The following will explain each step of the control method of the embodiment of the present disclosure in detail:

[0055] As Figure 2As shown, a submerged arc electric furnace may include electrodes 101 and charge 102, and the electrodes 101 and the charge 102 may be loaded into the furnace body. The furnace body may be cylindrical or conical. Of course, it may also be of other shapes, as long as it can carry the electrodes 101 and the charge 102, and no special limitation is made here. The electrodes 101 may be self-baking electrodes 101, or carbon electrodes 101 or graphite electrodes 101. Of course, they may also be other types of electrodes 101, and no special limitation is made here. The charge 102 may be in granular or powder form, and it may be a metal, an alloy or an inorganic non-metallic material. Of course, it may also be other materials, which are not listed one by one here. The end of the electrode 101 may be inserted into the charge 102 and may be in contact with the charge 102. The heat generated by the resistance of the charge 102 when current passes through the charge 102 and the heat generated by the arc between the electrode 101 and the charge 102 may be used to melt the charge 102. After the surface charge 102 is melted, new charge 102 may be added to the furnace body. During the stirring process of the charge 102, the contact characteristics between the electrode 101 and the charge 102 change, thereby causing impedance changes, and thus affecting the power and resulting in power fluctuations.

[0056] As Figure 1 shown, in step S110, the electrode is moved within a preset range in a preset step size, and the actual power of the electrode is detected in real time.

[0057] The electrode 101 may be moved within a preset range in a preset step size, so as to find the optimal contact point between the electrode 101 and the charge 102 and avoid large power fluctuations. The preset range may be the area where the electrode 101 inside the furnace body can move, and it may be an area preset according to the material of the charge 102 and the type of the electrode 101. The electrode 101 may move one or more times within this area and may move to any position within this area. In one embodiment, it may be an area centered on the position of the electrode 101 and that changes in real time as the electrode 101 moves, or it may be a fixed area for the electrode 101 to move, and no special limitation is made here. For example, it may be a circular area centered on the position of the electrode 101, or a square area centered on the position of the electrode 101. Of course, it may also be an area of other shapes, and no special limitation is made here.

[0058] The detection component 2 can be used to detect the actual power of the electrode 101 in real time. The actual power can be the actual working power of the electrode 101. Each time the electrode 101 is moved, the actual power of the electrode 101 can be detected once, so that the fluctuation of the working power of the electrode 101 can be monitored in real time. For example, each time the electrode 101 is moved, the electrode 101 can be stationary at the moved position for a period of time, and after a period of stationary, the detection component 2 can be used to detect the actual power of the electrode 101, so that the electrode 101 is in full contact with the charge 102, which is convenient for improving the accuracy of power detection. For example, the detection component 2 can include a power sensor. Of course, the detection component 2 can also include other elements, which are not specifically limited here.

[0059] In one embodiment, as Figure 3 shown, step S110 may include:

[0060] Step S1101, moving the electrode in any direction within a preset range with a preset step size.

[0061] The preset range can be a circular area centered on the electrode 101 with a preset distance as the radius. The electrode 101 can move in any direction within this circular area with a preset step size. It should be noted that the preset step size can be less than the radius of this circular area. The preset distance and the preset step size can be set according to the actual size of the furnace body. For example, when the furnace body diameter is greater than 800 mm, the preset distance can be 400 mm, and the value range of the preset step size can be 0 mm to 200 mm. For example, it can be 0 mm, 50 mm, 100 mm, 150 mm or 200 mm. Of course, it can also be other step sizes, which will not be listed one by one here.

[0062] The electrode 101 can be connected to a driving component 1, and the driving component 1 can be used to drive the electrode 101 to move in any direction. In one embodiment, the driving component 1 can include a plurality of driving units, and each driving unit can drive the electrode 101 to move in a preset direction. The preset direction can be any direction, and the preset direction is not specifically limited here. It should be noted that the plurality of driving units can respectively correspond to different preset directions to achieve multi-directional movement. For example, the driving component 1 can be a pulley with a counterweight. One end of the pulley can be connected to the electrode 101, and the other end can be connected to the counterweight. The electrode 101 can be driven to move by the movement of the counterweight on the pulley. The driving component 1 can also be a linear motor or other devices capable of driving the electrode 101 to move, which will not be listed one by one here.

[0063] The driving component 1 can be connected to a control component 4 through a wire or wirelessly, and then a driving signal can be sent to the driving component 1 through the control component 4. The driving component 1 can drive the electrode 101 to move in any direction within a preset range with a preset step size according to the received driving signal. For example, the control component 4 can be a controller or a central processing unit. Of course, it can also be other types of control components 4, which will not be listed one by one here.

[0064] Step S1102: Detect the resistance value of the electrode and calculate the actual power of the electrode according to the corresponding relationship between the resistance value and the actual power.

[0065] A resistance value detection component 2 can be used to detect the resistance value of the electrode 101 in real time, that is, the resistance value of the electrode 101 can be detected each time the electrode 101 moves, and then the fluctuation of the resistance value of the electrode 101 can be monitored in real time. Thus, the actual power of the electrode 101 can be calculated by a calculation component according to the corresponding relationship between the resistance value and the actual power. For example, the calculation component can calculate the actual power of the electrode 101 through a calculation program or a calculation formula. Of course, the actual power of the electrode 101 can also be calculated by other means, which will not be listed one by one here. The calculation component can be calculation software, an arithmetic unit, or other components that can implement calculation functions, and no special limitation is made here.

[0066] In one embodiment, the actual power can be determined according to the corresponding relationship between the resistance value and the actual power. For example, the actual power can be determined by a third formula, where the third formula can be defined as:

[0067]

[0068] where, P n is the actual power, R is the resistance value of the electrode 101, and U is the working voltage.

[0069] As Figure 1 shown, in step S120, the fluctuation parameter of the electrode is calculated in real time according to the actual power and the preset power.

[0070] The preset power can be the rated power of the electrode 101 set in advance, and this rated power can be stored in the storage component in advance. The actual power can be the actual power of the electrode 101 obtained through detection. After detecting the actual power of the electrode 101, the detection result can be transmitted to the calculation component. The calculation component can call the preset power of the electrode 101 in the storage component and calculate the fluctuation parameter of the electrode 101 in real time according to the actual power and the preset power. This fluctuation parameter can be used as a fluctuation index of the electrode 101 to judge the fluctuation amplitude of the electrode 101.

[0071] The computing component may include a computing program or a computing formula, and the fluctuation parameter of the electrode 101 can be calculated through the computing program or the computing formula. Of course, other methods can also be used for calculation, and no special limitation is imposed on the calculation method or calculation software of the fluctuation parameter herein.

[0072] In one embodiment, the fluctuation parameter can be calculated through a first formula, and the first formula can be defined as:

[0073]

[0074] where σ is the fluctuation parameter, P n is the actual power, P set is the preset power, N is the number of detections, and N is an integer greater than 1.

[0075] As Figure 1 shown, in step S130, when the fluctuation parameter is less than the fluctuation threshold, the movement of the electrode is controlled to stop. When the fluctuation parameter is not less than the fluctuation threshold, the electrode is stopped at the position where the minimum value of the fluctuation parameter appears within the preset range, and the position where the electrode stops is used as the target position.

[0076] The fluctuation threshold can be set to measure whether the fluctuation parameter is within the normal fluctuation range. The size of the fluctuation parameter and the fluctuation threshold can be compared. When the fluctuation parameter is less than the fluctuation threshold, it can be considered that the power is within the normal fluctuation range. At this time, the control component 4 can be used to control the driving component to stop working, so that the movement of the electrode 101 stops, and the position where the electrode 101 stops can be used as the target position. This target position can be used as the optimal operating point of the electrode 101, that is, at this point, the power fluctuation of the electrode 101 is within an acceptable range. If the position where the fluctuation parameter is less than the fluctuation threshold is not found after the movement range of the electrode 101 covers the entire preset range, the electrode 101 can be stopped at the position where the minimum value of the fluctuation parameter appears within the preset range, and this position can be used as the target position of the electrode 101 within this preset range.

[0077] In one embodiment, during the movement of the electrode 101, the fluctuation parameter can be compared with the fluctuation threshold in real time by a comparison component, and the comparison result can be sent to the control component 4. When the fluctuation parameter is less than the fluctuation threshold, the control component 4 can control the driving component to stop working, so that the electrode 101 stops at the position where the fluctuation parameter is less than the fluctuation threshold. When the fluctuation parameter is greater than or equal to the fluctuation threshold, the control component 4 can control the driving component to continue moving, thereby driving the electrode 101 to move again within a preset range according to a preset step size, and the fluctuation parameter of the electrode 101 at the new position can be calculated according to the corresponding relationship between the fluctuation power and the preset power after each movement. When the fluctuation parameter is greater than or equal to the fluctuation threshold, the above process is repeated to find the optimal operating point of the electrode 101. If after the movement range of the electrode 101 covers the entire preset range, there is still no point where the fluctuation parameter is less than the fluctuation threshold (i.e., the fluctuation parameter is still greater than or equal to the fluctuation threshold), the position with the minimum value of the fluctuation parameter during the movement can be used as the target position, so that the electrode 101 stops at this target position.

[0078] As Figure 1 shown, in step S140, the actual voltage value and actual current value of the electrode at the target position are detected, and the operating voltage of the electrode is calculated according to the actual voltage value, actual current value and preset power.

[0079] The actual voltage value can be the actual working voltage of the electrode 101, and the actual current value can be the actual working current of the electrode 101. The detection component 2 can be used to detect the actual voltage value and actual current value of the target position. For example, the detection component 2 can include a voltage sensor and a current sensor. Of course, it can also include other detection devices or detection elements, which will not be listed one by one here.

[0080] The operating voltage of the electrode 101 can be calculated according to the actual voltage value, actual current value and preset power. Specifically, a calculation component can be used to calculate the operating voltage of the electrode 101. For example, the calculation component can calculate the operating voltage through a calculation program or calculation formula. Of course, the operating voltage can also be calculated by other methods, which will not be listed one by one here. The calculation component can be an arithmetic unit or other components that can implement calculation functions, and no special limitation is made here.

[0081] In one embodiment, the actual voltage value can be calculated according to the second formula, and the second formula can be defined as:

[0082]

[0083] where U set is the operating voltage of the electrode 101, U m is the actual voltage value of the electrode 101, I m is the actual current value of the electrode 101, Pset is the preset power.

[0084] As Figure 1 shown, in step S150, the voltage level is adjusted according to the operating voltage so that the voltage level matches the operating voltage.

[0085] The voltage level matching the operating voltage can be selected according to the operating voltage, and the voltage level matching the operating voltage can be adjusted by the control component 4 according to the operating voltage, so as to avoid fluctuations caused by the mismatch between the operating voltage and the voltage level.

[0086] For example, the control component 4 can be electrically connected to an adjustment component 5. The adjustment component 5 can be used to adjust the voltage level. There can be multiple voltage levels. The adjustment component 5 can select the voltage level corresponding to the value according to the value of the operating voltage. For example, the adjustment component 5 can be an adjustment knob. The knob can rotate between multiple voltage levels. The control component 4 can control the adjustment component 5 to rotate to the appropriate voltage level according to the value of the operating voltage, so that the operating voltage matches the voltage level, avoiding voltage instability caused by the mismatch between the operating voltage and the voltage level, and further causing power fluctuations.

[0087] In an embodiment, as the furnace charge 102 melts, the contact surface between the electrode 101 and the furnace charge 102 changes, resulting in obvious power fluctuations. Therefore, it is necessary to find the next target position again to avoid large power fluctuations. Specifically, the fluctuation parameter of the electrode 101 can be re-detected after the stationary time T at the target position. When the detected fluctuation parameter is greater than or equal to the fluctuation threshold, the electrode 101 is moved within the preset range according to the preset step size, so that the electrode 101 stops at the next target position, thus ensuring that the electrode 101 is always at the optimal operating point, and further avoiding large power fluctuations of the electrode 101. The value of T can be set according to the melting speed of the furnace charge 102 and the power fluctuation situation. For example, the value range of T can be 30S to 180S. For example, it can be 30S, 60S, 90S, 120S or 180S. Of course, it can also be other time intervals, which will not be listed one by one here.

[0088] It should be noted that the electrode 101 can start moving with the target position as the initial position. It can find the next target position after one movement, or it can find the next target position after multiple movements. The number of movements is subject to the actual number of movements and is not specially limited here.

[0089] Meanwhile, the detection component 2 can detect the actual voltage value and actual current value of the electrode 101 at the next target position, and can calculate the operating voltage of the electrode 101 at the next target position according to the actual voltage value, actual current value, and preset power. The voltage level is adjusted according to the operating voltage at the next target position to make the voltage level match the operating voltage at the next target position. The detection process of the actual voltage value and actual current value at the next target position can refer to the detection process of the actual voltage value and actual current value at the above-mentioned target position. The calculation process of the operating voltage and the adjustment process of the voltage level can refer to the calculation process of the operating voltage and the adjustment process of the voltage level at the above-mentioned target position, which will not be elaborated here.

[0090] As Figure 2 and Figure 4 shown, an embodiment of the present disclosure also provides a control device 100 for a submerged arc furnace. The submerged arc furnace may include an electrode 101 and furnace charge 102. The end of the electrode 101 can be inserted into the furnace charge 102. The control device may include a driving component 1, a detection component 2, a calculation component 3, a control component 4, and an adjustment component 5, where:

[0091] The driving component 1 can be used to drive the electrode 101 to move at a preset step within a preset range;

[0092] The detection component 2 can be used to detect the actual voltage value, actual current value, actual power, and position of the electrode 101;

[0093] The calculation component 3 can be used to calculate the fluctuation parameter of the electrode 101 in real time according to the actual power and the preset power; and to calculate the operating voltage of the electrode 101 according to the actual voltage value, actual current value, and preset power;

[0094] The control component 4 can be used to control the electrode 101 to stop moving when the fluctuation parameter is less than the fluctuation threshold. When the fluctuation parameter is not less than the fluctuation threshold, the electrode 101 is stopped at the position where the minimum value of the fluctuation parameter appears within the preset range, and the position where the electrode 101 stops can be used as the target position;

[0095] The adjustment component 5 can be used to adjust the voltage level according to the operating voltage to make the voltage level match the operating voltage.

[0096] The following details of the control device according to the embodiment of the present disclosure will be described in detail:

[0097] The electrode 101 can be moved within a preset range in a preset step size, so as to find the best contact point between the electrode 101 and the charge 102, and avoid large fluctuations in power. The preset range can be the area where the electrode 101 can move inside the furnace body, which can be an area preset according to the material of the charge 102 and the type of the electrode 101. The electrode 101 can move one or more times within this area and can move to any position within this area. In one embodiment, it can be an area centered on the position of the electrode 101 and that changes in real time as the electrode 101 moves, or it can be a fixed area for the electrode 101 to move, and no special limitation is made here. For example, it can be a circular area centered on the position of the electrode 101, or a square area centered on the position of the electrode 101. Of course, it can also be an area of other shapes, and no special limitation is made here.

[0098] The electrode 101 can be connected to a driving component 1, and the driving component 1 can drive the electrode 101 to move within a preset range in a preset step size. In one embodiment, the preset range can be a circular area centered on the electrode 101 with a preset distance as the radius. The electrode 101 can move within this circular area in any direction in a preset step size. It should be noted that the preset step size can be less than the radius of this circular area, and the preset distance and the preset step size can be set according to the actual size of the furnace body. For example, when the diameter of the furnace body is greater than 800 mm, the preset distance can be 400 mm, and the value range of the preset step size can be 0 mm to 200 mm. For example, it can be 0 mm, 50 mm, 100 mm, 150 mm or 200 mm. Of course, it can also be other step sizes, and no further listing is made here. The driving component 1 can include a plurality of driving units, and each driving unit can drive the electrode 101 to move in a preset direction, and this preset direction can be any direction, and no special limitation is made on the preset direction here. It should be noted that the plurality of driving units can respectively correspond to different preset directions to achieve multi-directional movement. For example, the driving component 1 can be a linear motor or other devices capable of driving the electrode 101 to move, and no further listing is made here.

[0099] A detection component 2 can be used to detect the actual voltage value, actual current value, actual power of the electrode 101 and the position where the electrode 101 is located in real time. The actual voltage value can be the actual working voltage of the electrode 101, the actual current value can be the actual working current of the electrode 101, and the actual power can be the actual working power of the electrode 101. The detection component 2 can be used to detect the actual voltage value and actual current value at the target position. For example, the detection component 2 can include a voltage sensor, a current sensor, a power sensor and a position sensor. Of course, it can also include other detection devices or detection elements, and no further listing is made here.

[0100] Each time the electrode 101 is moved, the actual voltage value, actual current value, actual power of the electrode 101, and the position where the electrode 101 is located can be detected, so as to calculate the fluctuation parameters and operating voltage of the electrode 101 based on the actual voltage value, actual current value, and actual power, and then monitor the fluctuation of the working power of the electrode 101 in real time. For example, each time the electrode 101 is moved, the electrode 101 can be stationary at the moved position for a period of time, and after a period of stationary time, the detection component 2 can be used to detect the actual voltage value, actual current value, actual power of the electrode 101, and the position where the electrode 101 is located, so that the electrode 101 is in full contact with the charge 102, which is convenient for improving the accuracy of data detection and further improving the accuracy of power detection. For example, the detection component 2 can include a voltage sensor, a current sensor, a power sensor, and a position sensor. Of course, the detection component 2 can also include other components, which are not specifically limited here.

[0101] The fluctuation threshold can be set to measure whether the fluctuation parameter is within the normal fluctuation range. The size of the fluctuation parameter can be compared with the fluctuation threshold. When the fluctuation parameter is less than the fluctuation threshold, it can be considered that the power is within the normal fluctuation range. At this time, the control component 4 can control the drive component 1 to stop working, so that the electrode 101 stops moving, and the position where the electrode 101 stops can be used as the target position. This target position can be used as the optimal operating point of the electrode 101, that is, at this point, the power fluctuation of the electrode 101 is the smallest. If a position where the fluctuation parameter is less than the fluctuation threshold is not found after the moving range of the electrode 101 covers the entire preset range, the electrode 101 can be stopped at the position where the minimum value of the fluctuation parameter appears in the preset range, and this position can be used as the target position of the electrode 101 in this preset range.

[0102] The control component 4 can be connected to the drive component 1 through a wire or wirelessly. Furthermore, a drive signal can be sent from the control component 4 to the drive component 1, and the drive component 1 can drive the electrode 101 to move in any direction within the preset range with a preset step size according to the received drive signal. For example, the control component 4 can be a controller or a central processing unit. Of course, it can also be other types of control components 4, which will not be listed one by one here.

[0103] The preset power can be the rated power of the electrode 101 set in advance, and this rated power can be stored in the storage component in advance. The actual power can be the actual power of the electrode 101 obtained through detection. After the actual power of the electrode 101 is detected, the detection result can be transmitted to the calculation component 3. The calculation component 3 can call the preset power of the electrode 101 in the storage component, and can calculate the fluctuation parameter of the electrode 101 in real time according to the actual power and the preset power. This fluctuation parameter can be used as the fluctuation index of the electrode 101 to judge the fluctuation amplitude of the electrode 101.

[0104] The computing component 3 can be used to calculate the fluctuation parameter and operating voltage of the electrode 101. For example, the computing component 3 can calculate the fluctuation parameter and operating voltage of the electrode 101 through a computing program or a computing formula. Of course, the fluctuation parameter and operating voltage can also be calculated by other means, which will not be listed one by one here. The computing component 3 can be an arithmetic unit or other components that can implement the computing function, and no special limitation is made here.

[0105] The adjusting component 5 can be electrically connected to the control component 4 and is used to adjust the voltage level. There can be multiple voltage levels. The adjusting component 5 can select the voltage level corresponding to the value of the operating voltage according to the value of the operating voltage, so that the voltage level matches the operating voltage. For example, the adjusting component 5 can be an adjusting knob, which can rotate among multiple voltage levels. The control component 4 can control the adjusting component 5 to rotate to the appropriate voltage level according to the value of the operating voltage, so that the operating voltage matches the voltage level, avoiding power fluctuations caused by the mismatch between the operating voltage and the voltage level.

[0106] The working process of the control device 100 and the control method of the submerged arc furnace according to the present disclosure will be briefly described below:

[0107] As Figure 5 shown, the fluctuation threshold of the electrode 101 can be preset in advance. Taking the fluctuation threshold as the standard to measure whether the fluctuation parameter is within the normal fluctuation range, the electrode 101 is actively moved to find the point where the electrode 101 is in good contact with the furnace charge 102, and this point is used as the optimal operating point (i.e., the target position). The voltage level of the transformer can also be adjusted by the adjusting component 5, so that the operating voltage of the electrode 101 at the target position matches the voltage level, avoiding large power fluctuations caused by the mismatch between the operating voltage and the voltage level. The electrode 101 can also be maintained stationary at the target position within the time interval T, and the fluctuation parameter of the electrode 101 is detected after the time interval T. When the fluctuation parameter is less than the fluctuation threshold, the electrode 101 is kept stationary at this target position. When the fluctuation parameter is greater than or equal to the fluctuation threshold, the electrode 101 is moved according to the preset step length, and the fluctuation parameter of the electrode 101 is detected again. If the fluctuation parameter is still greater than the fluctuation threshold, the next target position is searched again, so that the electrode 101 stops at the next target position. If the fluctuation parameter is not greater than the fluctuation threshold, the fluctuation parameter of the electrode 101 is detected again after the stationary time T, so as to ensure that the electrode 101 is always at the optimal operating point, thereby reducing power fluctuations, enabling the electrode 101 to be always in a better contact area, with simple operation, obvious adjustment effect, and high adjustment efficiency.

[0108] Other embodiments of the present disclosure will be readily apparent to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include known common general knowledge or conventional technical means in the technical field not disclosed in the present disclosure. The specification and examples are only to be considered as exemplary, and the true scope and spirit of the present disclosure are pointed out by the appended claims.

Claims

1. A control method for a submerged arc electric furnace, the submerged arc electric furnace comprising electrodes and furnace charge, with the ends of the electrodes inserted into the furnace charge, characterized in that, the control method comprises: moving the electrodes within a preset range in preset steps and detecting the actual power of the electrodes in real time; calculating the fluctuation parameter of the electrodes in real time according to the actual power and the preset power; when the fluctuation parameter is less than the fluctuation threshold, controlling the electrodes to stop moving; when the fluctuation parameter is not less than the fluctuation threshold, stopping the electrodes at the position where the minimum value of the fluctuation parameter appears within the preset range, and taking the position where the electrodes stop as the target position; detecting the actual voltage value and actual current value of the electrodes at the target position, and calculating the operating voltage of the electrodes according to the actual voltage value, the actual current value and the preset power; adjusting the voltage grade according to the operating voltage to make the voltage grade match the operating voltage; calculating the fluctuation parameter by a first formula, the first formula being: where σ is the fluctuation parameter, P n is the actual power, P set is the preset power, N is the number of detections, and N is an integer greater than 1; calculating the operating voltage by a second formula, the second formula being: Among them, U set is the operating voltage of the electrode, U m is the actual voltage value of the electrode, I m is the actual current value of the electrode, P set is the preset power.

2. The control method according to claim 1, characterized in that, when the fluctuation parameter is less than the fluctuation threshold, controlling the electrodes to stop moving; when the fluctuation parameter is not less than the fluctuation threshold, stopping the electrodes at the position where the minimum value of the fluctuation parameter appears within the preset range, and taking the position where the electrodes stop as the target position includes: comparing the magnitude of the fluctuation parameter with the fluctuation threshold, and when the fluctuation parameter is less than the fluctuation threshold, controlling the electrodes to stop moving so that the electrodes stop at the position where the fluctuation parameter is less than the fluctuation threshold; when the fluctuation parameter is greater than or equal to the fluctuation threshold, moving the electrodes again within the preset range in the preset steps, and recalculating the fluctuation parameter at the position where the electrodes are located after each movement until the moving range of the electrodes covers the preset range, taking the position where the minimum value of the fluctuation parameter appears during the movement as the target position, and stopping the electrodes at the target position.

3. The control method according to claim 1, characterized in that, the value range of the preset step is 0 mm to 200 mm.

4. The control method according to claim 1, characterized in that, the control method further comprises: after standing for a time T at the target position, re-detecting the fluctuation parameter, and when the fluctuation parameter is greater than or equal to the fluctuation threshold, moving the electrodes in the preset steps so that the electrodes stop at the next target position; detecting the actual voltage value and actual current value of the electrodes at the next target position, and calculating the operating voltage of the electrodes at the next target position according to the actual voltage value, the actual current value and the preset power; adjusting the voltage grade according to the operating voltage at the next target position to make the voltage grade match the operating voltage at the next target position.

5. The control method according to claim 1, characterized in that, The control component is used to control the driving component to drive the electrode to move within the preset range with the preset step size.

6. A control device for a submerged arc furnace, the submerged arc furnace comprising an electrode and furnace charge, and the end of the electrode being inserted into the furnace charge, characterized in that the control device comprises: a driving component, configured to drive the electrode to move within a preset range with a preset step size; a detection component, configured to detect in real time the actual voltage value, actual current value, actual power and position of the electrode; a calculation component, configured to calculate in real time the fluctuation parameter of the electrode according to the actual power and the preset power; and configured to calculate the operating voltage of the electrode according to the actual voltage value, the actual current value and the preset power; a control component, configured to control the electrode to stop moving when the fluctuation parameter is less than the fluctuation threshold, and when the fluctuation parameter is not less than the fluctuation threshold, stop the electrode at the position where the minimum value of the fluctuation parameter appears within the preset range, and use the position where the electrode stops as the target position; an adjustment component, configured to adjust the voltage level according to the operating voltage so that the voltage level matches the operating voltage; The fluctuation parameter is calculated by a first formula, and the first formula is: where σ is the fluctuation parameter, P n is the actual power, P set is the preset power, N is the number of detections, and N is an integer greater than 1; The operating voltage is calculated according to a second formula, and the second formula is: Among them, U set is the operating voltage of the electrode, U m is the actual voltage value of the electrode, I m is the actual current value of the electrode, P set is the preset power.

7. The control device according to claim 6, characterized in that the value range of the preset step size is 0 mm to 200 mm.

8. The control device according to claim 6, characterized in that the control component is used to control the driving component to drive the electrode to move within the preset range with the preset step size.

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