SYSTEM AND METHOD FOR CONTROLLING THE AUTOMATIC ADVANCE OF AN INJECTOR

Abstract

According to a disclosed embodiment, an auto-push control system comprises: a reactor including an outer wall; an injector passing through the outer wall of the reactor to be inserted into the reactor; a sensor disposed in the injector; and a control unit for adjusting a speed at which the injector is inserted into the reactor. The control unit calculates the loss length of the injector on the basis of a signal from the sensor, and compensates for the insertion length of the injector on the basis of the calculated loss length of the injector and the predetermined insertion length of the injector according to the insertion speed of the injector.

Description

1 / 16 SYSTEM AND METHOD FOR CONTROLLING THE AUTOMATIC ADVANCE OF AN INJECTOR TECHNICAL FIELD

[001] The present invention relates to an automatic feed control system and a method for automatic feed control of an injector. Specifically, the present invention relates to an automatic feed control system and a method for automatic feed control that detect, in an injector inserted at a constant rate inside a reactor, the loss of injector length due to heat and / or friction within the reactor and compensate for the corresponding length. BACKGROUND OF THE TECHNIQUE

[002] In processes such as direct reduction casting (DRS) carried out in a reactor, an injector is provided to supply oxygen, cooling water, nitrogen, carbon and the like to the inside of the reactor. As the injector is inserted into the reactor, cracking and wear can occur due to thermal shock from the high ambient temperature inside the reactor and replacing the injector consequently requires substantial time and cost.

[003] As a solution to this, the adoption of an automatic injector advance function is being considered, so that it is inserted at a constant rate towards the interior of the reactor. However, it is difficult to identify the remaining length of the injector inserted into the reactor in real time, making it difficult to maintain the space between the distal end of the injector and the outer wall of the reactor.

[004] When the space between the distal end of the injector and the outer wall of the reactor is too large, damage to the distal end of the injector will worsen and the injector replacement cycle will be reduced, and when the space between the distal end of the injector and the outer wall of the reactor is too small, the refractory material on the wall Petition 870250073716, dated 08 / 20 / 2025, page 8 / 43 2 / 16 of the reactor's exterior may be damaged due to the high temperature at the distal end of the injector that discharges oxygen or similar. DESCRIPTION Technical Problem

[005] Even with the aforementioned automatic injector advance function, it is difficult to maintain the space between the distal end of the injector inside the reactor and the outer wall of the reactor, and the refractory material of the injector or the outer wall may be deformed and / or damaged by heat. The embodiments of the present invention relate to an automatic injector advance control system and a method of automatic advance control that can solve the aforementioned problems. Technical Solution

[006] To solve the aforementioned problem, the technical idea of ​​the present invention provides an automatic advance control system comprising: a reactor comprising an outer wall; an injector configured to penetrate the outer wall of the reactor and be inserted into the reactor; a sensor placed on the injector; and a controller configured to control the insertion distance or the insertion rate of the injector into the reactor, wherein the controller is further configured to: calculate an injector loss length based on a signal from the sensor; and compensate the injector insertion distance based on the insertion length depending on the predefined insertion rate of the injector and the calculated loss length of the injector.

[007] In exemplary embodiments, the sensor comprises a first sensor and a second sensor and the distances from a distal end of the injector to the positions of the first sensor and the second sensor are different.

[008] In exemplary embodiments, the sensor comprises Petition 870250073716, dated 08 / 20 / 2025, page 9 / 43 3 / 16 still a third sensor and in which the first sensor, the second sensor and the third sensor are positioned at a regular interval in a longitudinal direction of the injector.

[009] In exemplary embodiments, the regular interval between the positions of the first sensor, the second sensor and the third sensor varies between 50 mm and 150 mm.

[0010] In exemplary embodiments, the compensation length (Lc) of the injector inserted for compensation is calculated by the equation: Lc = S - Ln where, in the equation, S corresponds to the straight-line distance from a molten metal blow part of the injector to the sensor, and Ln corresponds to the automatic feed insertion length derived from a product of a predefined insertion rate (vn) of the injector and the time required for insertion.

[0011] In exemplary embodiments, the outer wall of the reactor comprises a plurality of refractory bricks.

[0012] In exemplary embodiments, the outer wall of the reactor comprises a plurality of refractory bricks, wherein the plurality of refractory bricks comprises cone-shaped bricks and square bricks, wherein the cone-shaped bricks are positioned to surround the injector and wherein the square bricks are positioned to be spaced from the injector.

[0013] In exemplary embodiments, the sensor is a thermocouple sensor.

[0014] In exemplary embodiments, a plurality of sensors is provided and they are positioned successively along a longitudinal direction of the injector.

[0015] In exemplary embodiments, the injector comprises a first injector and a second injector, wherein the first injector is con Petition 870250073716, dated 08 / 20 / 2025, page 10 / 43 Figure 4 / 16 shows a system to supply oxygen to the reactor, where the second injector is configured to supply carbon to the reactor.

[0016] In exemplary embodiments, the injector has a cylindrical shape and the sensor is placed inside the injector.

[0017] To solve the aforementioned problem, the technical idea of ​​the present invention provides an automatic feed control method that uses the automatic feed control system according to claim 1, the automatic feed control method comprising: feeding a reagent into the reactor by means of the injector; inserting the injector into the reactor at a constant rate; recognizing, by the sensor, a signal and transmitting the signal to the controller; and calculating, by the controller, the difference between the insertion length depending on the predefined insertion rate of the injector and the distance from a distal end of the injector to the position of the sensor and compensating for the insertion distance of the injector.

[0018] In exemplary embodiments, the injector comprises a first injector and a second injector, wherein the first injector is configured to supply oxygen to the reactor, wherein the second injector is configured to supply carbon to the reactor, and wherein the insertion rate of the first injector into the reactor is greater than that of the second injector. Advantageous Effects

[0019] With the automatic feed control system and the automatic feed control method of the present invention, by maintaining a constant space between the distal end of an injector inserted into a reactor and a refractory material on the outer wall of the reactor, deformation and damage to the refractory material due to heat can be minimized. Furthermore, with the automatic feed control system and the automatic feed control method of the present invention, operational productivity can be improved, re Petition 870250073716, dated 08 / 20 / 2025, page 11 / 43 5 / 16 reducing the maintenance time of the injector and refractory material. DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a view illustrating the configuration of an automatic feed control system according to one embodiment.

[0021] Figures 2A and 2B are enlarged views of area A in Figure 1.

[0022] Figure 3 is a view that illustrates an injector, a sensor, and a controller.

[0023] Figure 4 is an enlarged view of area B in Figure 3.

[0024] Figure 5 is a view that illustrates the configuration of an automatic feed control system according to another embodiment.

[0025] Figure 6 is a flowchart of an automatic feed control method according to a modality. METHOD FOR THE INVENTION

[0026] The embodiments of the present invention are exemplified to describe the technical spirit of the present invention. The scope of rights under the present invention is not limited to the embodiments presented below or to the specific description of such embodiments.

[0027] All technical and scientific terms used in the present invention have meanings that are commonly understood by those skilled in the art to which the present invention relates, unless otherwise defined. All terms used in the present invention have been selected for the purpose of describing it more clearly and have not been selected to limit the scope of the rights provided for in the present invention.

[0028] As used in the present invention, expressions such as comprising, including, having and similar Petition 870250073716, dated 08 / 20 / 2025, p. 12 / 43 6 / 16 "res" should be understood as open terms that have the possibility of encompassing other modalities, unless mentioned otherwise in the phrase or sentence that includes such expressions.

[0029] The singular expressions described in this invention may encompass the meanings of plural expressions, unless otherwise stated, which shall also apply to the singular expressions cited in the claims.

[0030] As used in the present invention, expressions such as first, second and the like are used to distinguish a plurality of elements from each other and are not intended to limit an order or importance of the corresponding elements.

[0031] When a given component is described as being coupled to or connected to another component, this should be understood as meaning that the given component can be coupled or connected directly to the other component or that the given component can be coupled or connected to the other component by means of another new component.

[0032] The present invention is not limited to the dimensions and numerical values ​​described herein. Unless otherwise specified, such dimensions and numerical values ​​may be understood as the stated values ​​and equivalent ranges, including the values. For example, a dimension of 50 mm described herein may be understood as including approximately 50.

[0033] In the present invention, the term molten metal blow part can be understood as the part of an injector that comes into contact with the molten metal inside the reactor when the injector, in its initial state, is inserted into the reactor. In contrast, the term injector end can be understood as the part of the injector furthest from the refractory material in the remaining length of the injector when loss occurs in the injector when it is inserted into the reactor. Petition 870250073716, dated 08 / 20 / 2025, page 13 / 43 7 / 16

[0034] The embodiments of the present invention will now be described with reference to the accompanying drawings. In the accompanying drawings, identical or corresponding components are given the same reference numbers. Furthermore, in the description of the embodiments below, redundant descriptions of identical or corresponding components may be omitted. However, even if the description of a component is omitted, such component should not be excluded from an embodiment.

[0035] Figure 1 is a view illustrating the configuration of an automatic feed control system 1 according to one embodiment. Figures 2A and 2B are enlarged views of area A in Figure 1.

[0036] With reference to Figures 1, 2A and 2B, the automatic feed control system 1 is configured to maintain the space between the outer wall of a reactor and the distal end of an injector inserted into the reactor to feed oxygen, carbon, nitrogen, cooling water and the like to the reactor. When the space between the distal end of the injector and the outer wall of the reactor is too large, damage to the distal end of the injector is aggravated and the injector replacement cycle is reduced, and when the space between the distal end of the injector and the outer wall of the reactor is too small, the refractory material in the outer wall of the reactor may be damaged due to the high temperature at the distal end of the injector discharging oxygen or the like. Consequently, it is essential to maintain the space between the distal end of the injector and the outer wall of the reactor to avoid deformation and damage to the refractory material that constitutes part of the outer wall of the reactor.

[0037] The automatic advance control system 1 may include a reactor 11, an injector 12, a sensor 13 and a controller 14.

[0038] Reactor 11 may include an outer wall 110 and an inner space C. The outer wall 110 is positioned to surround Petition 870250073716, dated 08 / 20 / 2025, page 14 / 43 8 / 16 The reactor surface and the internal space C may correspond to the space within the reactor defined by the outer wall 110. The outer wall 110 may be formed from a heat-resistant material. The outer wall 110 may include an iron casing 111 and a plurality of refractory bricks 112. The iron casing 111 may form the outermost surface of the outer wall 110. The iron casing 111 is capable of preventing the leakage of high-temperature materials into the internal space C. The refractory bricks 112 may be positioned adjacent to the inner wall of the iron casing 111. The refractory bricks 112 may be made of an oxide material, such as Mg or Cr, and minimize the heat discharge from the high-temperature materials within the internal space C to the exterior. The refractory bricks 112 may include conical bricks 112a and square bricks 112b.The conical bricks 112a may have a horn shape or a truncated shape, whose cross-sectional area increases from the outside to the inside of the reactor 11. The conical bricks 112a may be positioned to surround the injector 12. The square bricks 112b may have the shape of a regular hexahedron or a rectangular parallelepiped. The square bricks 112b may be positioned spaced from the injector 12.

[0039] The internal space C may correspond to the space surrounded by the outer wall 110. The internal space C may be filled with high-temperature molten materials. The high-temperature molten materials may include, for example, lead concentrate, lead scrap, and lead by-products.

[0040] The injector 12 may be positioned to penetrate the outer wall 110 of the reactor 11. The injector 12 may be shaped into a cylinder. The injector 12 is capable of feeding reaction materials (e.g., oxygen in the oxidation zone and carbon in the reduction zone), cooling water, and other gases into the internal space C of the reactor 11. The injector 12 inserted into the reactor 11 may come into direct contact Petition 870250073716, dated 08 / 20 / 2025, page 15 / 43 9 / 16 with the materials at high temperature inside the internal space C of the reactor 11. Consequently, the injector 12 can be manufactured with a heat-resistant material.

[0041] The injector 12 can be gradually inserted in direction F towards the interior of the reactor 11. That is, the injector 12 can be pushed to be gradually inserted into the inner surface C through the outer wall 110 of the reactor 11. This is defined as the automatic advance of the injector. In one embodiment, the injector 12 can be inserted into the reactor 11 in direction F at a constant rate. For example, the injector 12 in the oxidation zone can be inserted at a rate of 0.2 mm / h and the injector 12 in the reduction zone can be inserted at a rate of 0.1 mm / h. Since the injector 12 is gradually pushed into the reactor 11, even when length loss occurs at the distal end 12A of the injector 12 due to wear and cracking from high temperature, the space between the outer wall 110 of the reactor 11 and the distal end 12A of the injector 12 can be maintained to some extent.

[0042] Sensor 13 is capable of detecting the loss of length of the distal end 12A of the injector 12 due to prolonged exposure to high temperatures. Sensor 13 may be located on the injector 12. Sensor 13 may be located inside the cylindrical injector 12. Sensor 13 may include a plurality of sensors 13. For example, sensor 13 may include a first sensor 13a and a second sensor 13b. Sensor 13 may also include a third sensor 13c. Sensor 13 may also include a fourth sensor 13d. The distances from the molten metal blowing part 121 of the injector 12 to the plurality of sensors 13 may differ from each other. The distance from the molten metal blowing part 121 to sensor 13 will be described in more detail below with reference to Figures 3 and 4.

[0043] Sensor 13 may include all common sensor covers Petition 870250073716, dated 08 / 20 / 2025, page 16 / 43 10 / 16 times to detect if the reactor is operational (e.g., on / off). Preferably, the sensor may include a sensor capable of detecting heat or temperature increase. More preferably, the sensor may be a thermocouple sensor. The thermocouple sensor is a device made of two types of metals to measure temperature over a wide range using the Seebeck effect.

[0044] The sensors 13 according to another embodiment can be positioned successively along the longitudinal direction of the injector 12. When the sensors 13 are positioned successively along the longitudinal direction of the injector 12, the length at which the injector 12 is inserted into the reactor 11 can be recognized in real time.

[0045] The controller 14 can be connected to the distal end opposite the molten metal blowing part 121 of the injector 12. The controller 14 can receive signals from the sensor 13. The controller 14 can adjust the rate and / or insertion length of the injector 12 into the reactor 11 in the F direction. The controller 14 can calculate the loss length S of the injector 12 based on the signals from the sensor 13. The controller 14 can calculate the automatic advance insertion length Ln depending on the insertion rate vn of the injector 12 and the elapsed time. Controller 14 can compensate for the compensation length Lc based on the loss length S and the automatic advance insertion length Ln of injector 12. That is, controller 14 can calculate the difference between the loss length S and the automatic advance insertion length Ln of injector 12 and insert injector 12 to compensate for the compensation length Lc by the difference.

[0046] A method for determining the insertion compensation length Lc by controller 14 will be described in detail with reference to Figures 2A and 2B. Figure 2A illustrates injector 12 before wear. Figure 2B illustrates injector 12 at the time when the pri Petition 870250073716, dated 08 / 20 / 2025, page 17 / 43 11 / 16 The first sensor 13a detects the injector loss and generates a signal. Referring to Figure 2A, the second sensor 13b is positioned in line with the refractory bricks 112 before the injector 12 wears down. While the injector 12 is being worn down by heat, the injector 12 moves towards the interior of the reactor 11. Preferably, the injector 12 moves at a constant rate vn towards the interior of the reactor 11. The injector 12 is gradually worn away from the molten metal blowing part 121 by the high-temperature materials stored inside the reactor 11, and when the injector 12 is worn down to the position where the first sensor 13a is located, the first sensor 13a can detect this and transmit a signal to the controller 14. The distance from the molten metal blowing part 121 to the first sensor 13a corresponds to the loss length S of the injector 12.While injector 12 is lost by the loss length S, injector 12 can move at a constant rate vn and be inserted into reactor 11 by the automatic advance insertion length Ln. At this point, to keep the distance T from the distal end 12A of injector 12 to the refractory bricks 112 constant, it is necessary to compensate for the length obtained by subtracting the automatic advance insertion length Ln from the loss length S of injector 12. That is, when the value obtained by subtracting the automatic advance insertion length Ln from the loss length S of injector 12 is a positive number, controller 14 can additionally insert injector 12 into reactor 11 by the compensation length Lc. When the value obtained by subtracting the automatic advance insertion length Ln from the loss length S of injector 12 is a negative number, controller 14 can withdraw injector 12 from reactor 11 by the compensation length Lc.In other words, the compensation length Lc is a length obtained by subtracting the automatic advance insertion length Ln from the injection loss length S. Petition 870250073716, dated 08 / 20 / 2025, page 18 / 43 12 / 16 tor 12.

[0047] For example, when the distance from the molten metal blowing part 121 to the first sensor 13a is 100 mm, the first sensor 13a can detect the loss of injector 12 due to wear of injector 12 and generate a signal, thus calculating the loss length S of injector 12. That is, the loss length S of injector 12 at this moment is 100 mm. Based on the time period between the moment of injector 12 insertion and the moment of detection by the first sensor 13a and the automatic advance rate of injector 12, the automatic advance insertion length Ln can be calculated. For example, when the automatic advance rate is 0.2 mm / h and the first sensor 13a detects the loss of injector 12 after exactly 15 days, the insertion length by automatic advance Ln is calculated as 15 days x 24 h x 0.2 mm / h, corresponding to 72 mm.In this case, since the automatic feed insertion length Ln of injector 12 is only 72 mm, while injector 12 is worn by a loss length S of 100 mm, the compensation length Lc of 28 mm, which is the difference between the two lengths, can be compensated.

[0048] Figure 3 illustrates an injector 12, sensors 13, and a controller 14. Figure 4 is an enlarged view of area B in Figure 3. With reference to Figures 3 and 4, a plurality of sensors 13 may be located within the injector 12. The sensors 13 may include a first sensor 13a, a second sensor 13b, a third sensor 13c, and a fourth sensor 13d. The distances from the distal end 12A of the injector 12 to the first sensor 13a, the second sensor 13b, the third sensor 13c, and the fourth sensor 13d may differ from one another. The first sensor 13a, the second sensor 13b, the third sensor 13c, and the fourth sensor 13d may be positioned at regular intervals in the longitudinal direction of the injector 12. For example, the distance L1 of Petition 870250073716, dated 08 / 20 / 2025, page 19 / 43 The distance from the distal end 12A of the injector to the first sensor 13a can be from 50 mm to 150 mm. The distance L2 between the first sensor 13a and the second sensor 13b can correspond to the distance L3 between the second sensor 13b and the third sensor 13c. The distance L3 between the second sensor 13b and the third sensor 13c can correspond to the distance L4 between the third sensor 13c and the fourth sensor 13d. In this case, L2, L3, and L4 can be from 50 mm to 150 mm.

[0049] Figure 5 is a view that illustrates the configuration of an automatic feed control system 2 according to another embodiment.

[0050] The description of the automatic feed control system according to the embodiment described above with reference to Figures 1 to 4 also applies to the automatic feed control system according to another embodiment to be described later with reference to Figure 5. Next, with reference to Figure 5, an automatic feed control system according to another embodiment will be described, focusing on the differences in relation to the embodiment described above.

[0051] With reference to Figure 5, the automatic advance control system 2 may include two internal spaces C1 and C2, two injectors 221 and 222, two sets of sensors 231 and 232 and two controllers 241 and 242.

[0052] Reactor 21 may include two internal spaces C1 and C2. Internal spaces C1 and C2 include a first internal space C1 and a second internal space C2. The first internal space C1 and the second internal space C2 may be separated by a partition wall 25. The partition wall 25 may include a communication opening 25a. The communication opening 25a may be formed in a direction that crosses the partition wall 25 to allow the first internal space C1 and the second internal space C2 to be in communication. Petition 870250073716, dated 08 / 20 / 2025, page 20 / 43 14 / 16 fluidic communication between them. In another modality, the first internal space C1 and the second internal space C2 can be completely blocked by the dividing wall 25 to form independent spaces between them.

[0053] For example, the first internal space C1 is an oxidation zone and the first injector 221 inserted in the oxidation zone feeds oxygen, nitrogen and water for cooling to the first internal space C1. The average temperature of the first internal space C1 can vary, for example, from 1000 °C to 1150 °C. The second internal space C2 is a reduction zone and the second injector 222 inserted in the reduction zone feeds carbon C for reaction and water for cooling to the second internal space C2. The average temperature of the second internal space C2 can vary, for example, from 1100 °C to 1250 °C.

[0054] Since the first injector 221 feeds oxygen as a heat source, an oxidation reaction can occur around the distal end (e.g., distal end 12A in Figures 2A and 2B) of the first injector 221, and the temperature in region X can vary from about 1500 °C to 1600 °C. On the other hand, the second injector 221 can feed carbon. The second injector 221 may not feed oxygen. In this case, since no oxidation reaction occurs around the distal end 12A of the second injector 222, the temperature in region Y can vary from about 1200 °C to 1300 °C.That is, since the temperature range of the region around the first injector 221 (e.g., region X) is greater than the temperature range of the region around the second injector 222 (e.g., region Y), the wear of the distal end of the injector described above with reference to Figures 2A and 2B may be caused by an increase in the temperature of the region around the second injector 222 (e.g., region Y), the wear of the distal end of the injector described above with reference to Figures 1 to 4 may occur in a way. Petition 870250073716, dated 08 / 20 / 2025, page 21 / 43 15 / 16 is relatively active in the first injector 221. Consequently, the insertion rate vi of the first injector 221 into the internal space C1 can be greater than the insertion rate v2 of the second injector 222 into the internal space C2. For example, the first injector 221 can be inserted into the interior at a rate of 0.2 mm / h. For example, the second injector 222 can be inserted into the interior at a rate of 0.1 mm / h.

[0055] Figure 6 is a flowchart of an S300 automatic feed control method according to one embodiment. The S300 automatic feed control method includes the steps of: feeding a reagent into a reactor via an injector (S310); inserting the injector into the reactor at a constant rate (S320); measuring, by a sensor, the injector loss length (S330); transmitting a signal from the sensor to the controller (S340) and calculating, by a controller, the insertion length depending on the predefined insertion rate of the injector and the distance difference between a molten metal blow part of the injector and the sensor position, compensating for the injector insertion distance (S350).

[0056] The step of calculating, by a controller (for example, controller 14 in Figure 1), the insertion length depending on the predefined insertion rate of the injector (for example, injector 12 in Figure 1) and the difference in distance from the molten metal blowing part (for example, molten metal blowing part 121 in Figure 2A) of injector 12 to the position of the sensor (for example, sensor 13 in Figure 1) and compensating for the insertion distance of injector 12 (S350) can be performed by means of the process described above with reference to Figures 2A and 2B.

[0057] Although the process steps, method steps, algorithms, and the like are illustrated in sequential order in the flowchart in Figure 6, such processes, methods, and algorithms can be configured to operate in any suitable order. In other words, Petition 870250073716, dated 08 / 20 / 2025, page 22 / 43 16 / 16 The steps of the processes, methods, and algorithms described in various embodiments of the present invention do not need to be performed in the order described in the present invention. Furthermore, although some steps are described as being performed non-simultaneously, in other embodiments, some steps may be performed simultaneously. In addition, the exemplification of a process in a drawing does not imply that the exemplified process excludes other alterations and modifications, that the exemplified process or any of its steps is essential to one or more of the various embodiments of the present invention, or that the exemplified process is desirable.

[0058] With the automatic feed control system and the automatic feed control method according to the embodiments described above, the unnecessary loss of an injector (e.g., injector 12 in Figure 1) can be avoided, and deterioration and damage to the refractory bricks (e.g., refractory bricks 112 in Figure 1) located around injector 12 can be reduced. Furthermore, since deterioration and damage to refractory brick 112 are reduced, the maintenance time and cost of a reactor (e.g., reactor 11 in Figure 1) can be reduced, and operational productivity can be increased.

[0059] Above, the technical idea of ​​the present invention has been described with reference to some embodiments and examples illustrated in the accompanying drawings. However, it should be understood that various substitutions, modifications and alterations may be made without departing from the technical idea and scope of the present invention, which can be understood by those skilled in the art to which the present invention relates. Furthermore, such substitutions, modifications and alterations should be considered within the scope of the appended claims. Petition 870250073716, dated 08 / 20 / 2025, p. 23 / 43

Claims

1 / 3 CLAIMS 1. Automatic advance control system, characterized in that it comprises: a reactor comprising an outer wall; an injector configured to penetrate the outer wall of the reactor and be inserted into the reactor; a sensor placed on the injector; and a controller configured to control the insertion distance or the insertion rate of the injector into the reactor, wherein the controller is further configured to: calculate the injector loss length based on a signal from the sensor; and compensate the injector insertion distance based on the insertion length depending on the predefined insertion rate of the injector and the calculated loss length of the injector.

2. Automatic advance control system, according to claim 1, characterized in that the sensor comprises a first sensor and a second sensor, and the distances from a distal end of the injector to the positions of the first sensor and the second sensor are different.

3. Automatic advance control system, according to claim 2, characterized in that the sensor further comprises a third sensor and in that the first sensor, the second sensor and the third sensor are positioned at a regular interval in a longitudinal direction of the injector.

4. Automatic feed control system, according to claim 3, characterized in that the regular interval between the positions of the first sensor, the second sensor and the third sensor varies between 50 mm and 150 mm.

5. Automatic feed control system, according to claim 1, characterized in that the compensation length (Lc) of the injector inserted for compensation is calculated by the equation below: Lc = S - Ln where, in the equation, S corresponds to a straight-line distance from a molten metal blow part of the injector to the sensor, and where, in the equation, Ln corresponds to an automatic feed insertion length derived from a product of the predefined insertion rate (vn) of the injector and the time required for insertion.

6. Automatic feed control system, according to claim 1, characterized in that the outer wall of the reactor comprises a plurality of refractory bricks.

7. Automatic feed control system, according to claim 6, characterized in that the outer wall of the reactor comprises a plurality of refractory bricks, wherein the plurality of refractory bricks comprises cone-shaped bricks and square bricks, wherein the cone-shaped bricks are positioned to surround the injector, and wherein the square bricks are positioned so as to be spaced from the injector.

8. Automatic feed control system, according to claim 1, characterized in that the sensor is a thermocouple sensor.

9. Automatic advance control system, according to claim 1, characterized in that a plurality of sensors are provided and are positioned successively along a longitudinal direction of the injector.

10. Automatic advance control system, according to claim 1, characterized in that the injector with Petition 870250073716, dated 08 / 20 / 2025, page 25 / 43 3 / 3 comprises a first injector and a second injector, wherein the first injector is configured to supply oxygen to the reactor, and wherein the second injector is configured to supply carbon to the reactor.

11. Automatic advance control system, according to claim 1, characterized in that the injector has a cylindrical shape and the sensor is placed inside the injector.

12. Automatic feed control method using the automatic feed control system as defined in claim 1, characterized in that it comprises: feeding a reagent to the reactor via the injector; inserting the injector into the reactor at a constant rate; recognizing, by the sensor, a signal and transmitting the signal to the controller; and calculating, by the controller, the difference between the insertion length depending on the predefined insertion rate of the injector and the distance from a distal end of the injector to the position of the sensor and compensating for the insertion distance of the injector.

13. Automatic feed control method, according to claim 12, characterized in that the injector comprises a first injector and a second injector, wherein the first injector is configured to feed oxygen to the reactor, wherein the second injector is configured to feed carbon to the reactor, and wherein the insertion rate of the first injector into the reactor is greater than that of the second injector. Petition 870250073716, dated 20 / 08 / 2025, p. 26 / 43

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