Electric arc furnace with foamed slag height monitoring device

Abstract

The utility model discloses an electric arc furnace with a foamed slag height monitoring device, and relates to the technical field of metallurgy, the electric arc furnace with the foamed slag height monitoring device comprises a furnace body, the furnace body comprises a furnace wall, and the furnace wall is made of refractory materials; the foam slag height monitoring device comprises at least one first optical fiber arranged in the refractory material, at least one first fiber bragg grating temperature sensor is arranged on the first optical fiber, at least one first fiber bragg grating temperature sensor is arranged at the height of a preset measuring point in the vertical direction, and at least one second fiber bragg grating temperature sensor is arranged at the height of the preset measuring point in the vertical direction; detecting whether the slag liquid level in the furnace body reaches a preset measuring point height or not; and the fiber bragg grating demodulation module is connected to one end of the first optical fiber. According to the invention, the height of the foam slag can be effectively monitored in real time.

Description

Technical Field

[0001] The utility model relates to the technical field of metallurgy, in particular to an electric arc furnace with a foam slag height monitoring device. Background Art

[0002] Under the dual carbon strategic background of "carbon peak and carbon neutrality", electric arc furnace steelmaking has become an important means of steelmaking due to its advantages of short process, low energy consumption and low carbon emissions. Foamed slag technology plays a very important role in electric arc furnace steelmaking. The advantages of electric arc furnace foamed slag technology are that it can improve power factor and thermal efficiency, reduce electrode consumption, improve power supply efficiency, shorten smelting cycle, and reduce power consumption.

[0003] The application with publication number CN115679038A discloses a method and system for controlling the height of electric arc furnace foam slag based on noise and temperature, including a memory, a processor, a microphone and a temperature sensor. The memory stores a computer program, and the processor is used to implement the above-mentioned method for controlling the height of electric arc furnace foam slag based on noise and temperature when executing the computer program. The first microphone 1, the second microphone 2, and the third microphone 3 are installed at the top of the electric arc furnace to receive the noise generated during steelmaking in the electric arc furnace. The temperature sensor is installed at the furnace wall of the electric arc furnace to obtain the temperature of the furnace wall during steelmaking in the electric arc furnace. The technical solution is to obtain the temperature control range and noise control range of the foamed slag stable smelting stage under different process conditions of historical furnaces, predict the noise control range and temperature control range corresponding to the target process conditions, obtain the dynamic average sound intensity and dynamic average temperature in the target arc furnace through the first microphone 1, the second microphone 2, the third microphone 3 and the temperature sensor 4, judge whether the average sound intensity and the average temperature in the target arc furnace are within the noise control range and the temperature control range corresponding to the target process conditions, and objectively analyze whether the height of the foamed slag in the target arc furnace can be reasonably buried according to the feedback data. When the height of the foamed slag in the target arc furnace cannot be reasonably buried, resulting in the noise or temperature in the arc furnace exceeding the noise control range and the temperature control range corresponding to the target process conditions, control the injection of carbon powder and oxygen. When the noise or temperature in the arc furnace is within the noise control range and the temperature control range corresponding to the target process conditions, control the injection of carbon powder and oxygen, thereby avoiding the error of foamed slag height regulation caused by subjective factors of the operator, thereby realizing accurate and effective control of the height of the foamed slag in the arc furnace.

[0004] In the above technology, there are two problems: first, the error of the average temperature measured by the temperature sensor is large, and the position of the foam slag cannot be accurately measured; second, due to the large noise of the electric furnace smelting site and the unstable smelting, the noise monitoring method is not accurate enough. Therefore, how to accurately monitor the height of the foam slag has always been a problem to be solved. It is urgent to develop an effective foam slag height monitoring device to monitor the foam slag height in real time and better achieve the goal of energy conservation and emission reduction. Utility Model Content

[0005] In order to overcome the above-mentioned defects of the prior art, the technical problem to be solved by the embodiments of the utility model is to provide an electric arc furnace with a foam slag height monitoring device, which can effectively monitor the foam slag height in real time.

[0006] The specific technical solution of the embodiment of the utility model is:

[0007] An electric arc furnace with a foam slag height monitoring device, the electric arc furnace with the foam slag height monitoring device comprising:

[0008] A furnace body, the furnace body comprising a furnace wall, the furnace wall being made of refractory material;

[0009] A foam slag height monitoring device, the foam slag height monitoring device comprising: at least one first optical fiber arranged in the refractory material, the first optical fiber having at least one first fiber grating temperature sensor, and in the vertical direction, at least one first fiber grating temperature sensor at a preset measuring point height to detect whether the slag liquid level in the furnace body reaches the preset measuring point height; and a fiber grating demodulation module connected to one end of the first optical fiber.

[0010] Preferably, the side walls of the furnace wall are made of refractory material;

[0011] The first optical fiber includes a first sub-optical fiber, the first sub-optical fiber is arranged in the refractory material of the side wall of the furnace wall, the first sub-optical fiber extends in a vertical direction, and the first sub-optical fiber has a plurality of first sub-fiber Bragg grating temperature sensors arranged in compartments along the vertical direction, and the first fiber Bragg grating temperature sensor includes a first sub-fiber Bragg grating temperature sensor.

[0012] Preferably, the first sub-optical fiber is located at least on two opposite sides of the side wall of the furnace wall.

[0013] Preferably, there are a plurality of the first sub-optical fibers, and the plurality of the first sub-optical fibers are spaced apart along the circumferential direction of the side wall of the furnace wall.

[0014] Preferably, the spacing distance between the plurality of the first sub-fiber Bragg grating temperature sensors is less than or equal to 50 mm.

[0015] Preferably, the side wall of the furnace wall is made of refractory material; the bottom wall of the furnace wall is made of refractory material;

[0016] The first optical fiber includes a first sub-optical fiber, the first sub-optical fiber is arranged in the refractory material of the side wall of the furnace wall, the first sub-optical fiber has at least one first sub-fiber Bragg grating temperature sensor, the first fiber Bragg grating temperature sensor includes a first sub-fiber Bragg grating temperature sensor, and at least one first sub-fiber Bragg grating temperature sensor is provided at a preset measurement point height;

[0017] The first optical fiber also includes a second sub-optical fiber, which is arranged in the refractory material of the bottom wall of the furnace wall. The second sub-optical fiber has at least one second sub-fiber Bragg grating temperature sensor, and the first fiber Bragg grating temperature sensor includes the second sub-fiber Bragg grating temperature sensor.

[0018] Preferably, the second sub-fiber extends in a horizontal direction, and has a plurality of second sub-fiber Bragg grating temperature sensors arranged in horizontal compartments on the second sub-fiber, and the first fiber Bragg grating temperature sensor includes the second sub-fiber Bragg grating temperature sensor.

[0019] Preferably, there are a plurality of the second sub-optical fibers, and the plurality of the second sub-optical fibers are spaced apart in a horizontal direction along the bottom wall of the furnace wall.

[0020] Preferably, the first fiber grating temperature sensor is packaged with a high temperature resistant alloy.

[0021] Preferably, the operating temperature of the first fiber grating temperature sensor reaches 800 degrees Celsius; when there is molten steel in the furnace body, the first fiber grating temperature sensor is located at a position below 650 degrees Celsius in the refractory material.

[0022] The technical solution of the utility model has the following significant beneficial effects:

[0023] The electric arc furnace with a foam slag height monitoring device in the present application installs the first optical fiber with the first fiber Bragg grating temperature sensor into the refractory material of the furnace wall of the electric arc furnace. During the process of carbon spraying and oxygen blowing to make foam slag in the electric arc furnace, the temperature distribution of the furnace wall of the electric arc furnace is monitored by the first fiber Bragg grating temperature sensor, and the height of the foam slag liquid level and the molten steel liquid level is calculated according to the distribution of the furnace wall temperature. In this way, the liquid level changes in the arc furnace smelting and slag making process can be monitored in real time, without the need to manually open the furnace door for observation, thereby reducing the heat loss caused by smelting with the furnace door open. Since the electric arc furnace obtains the slag liquid level position in the electric arc furnace through the signal monitoring of the first fiber Bragg grating temperature sensor, the carbon spraying and oxygen supply parameters of the electric arc furnace can be adjusted in time according to the demand according to the carbon-oxygen reaction of the foam slag, so as to realize efficient and green smelting of the electric arc furnace. In addition, since the first optical fiber with the first fiber Bragg grating temperature sensor is installed in the refractory material of the furnace wall of the electric arc furnace, the first fiber Bragg grating temperature sensor can work stably for a long time at high temperature. Finally, the height of the foam slag liquid level in the electric arc furnace is measured by the first fiber Bragg grating temperature sensor, and the optical fiber sensing speed is fast and the measurement is accurate.

[0024] With reference to the following description and drawings, specific embodiments of the present invention are disclosed in detail, indicating the manner in which the principles of the present invention can be adopted. It should be understood that the embodiments of the present invention are not limited in scope. Features described and / or shown for one embodiment can be used in one or more other embodiments in the same or similar manner, combined with features in other embodiments, or replace features in other embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings described herein are only for explanation purposes and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the components in the drawings are only for illustration purposes to help understand the present invention, and are not intended to specifically limit the shapes and proportional dimensions of the components of the present invention. Under the guidance of the present invention, those skilled in the art can select various possible shapes and proportional dimensions to implement the present invention according to specific circumstances.

[0026] Figure 1 This is a schematic diagram of the principle of the foam slag height monitoring device in the utility model;

[0027] Figure 2 It is a front view of an electric arc furnace with a foam slag height monitoring device in the utility model in a first embodiment;

[0028] Figure 3 It is a top view of an electric arc furnace with a foam slag height monitoring device in the utility model in a first embodiment;

[0029] Figure 4It is a front view of the electric arc furnace with the foam slag height monitoring device in the utility model under the second embodiment;

[0030] Figure 5 It is a top view of an electric arc furnace with a foam slag height monitoring device in the utility model under a second embodiment.

[0031] Reference numerals of the above drawings:

[0032] 1. Furnace body; 11. Furnace wall; 111. Side wall; 112. Bottom wall; 113. Refractory material; 2. Foam slag height monitoring device; 21. First optical fiber; 211. First sub-optical fiber; 212. Second sub-optical fiber; 22. First fiber Bragg grating temperature sensor; 221. First sub-fiber Bragg grating temperature sensor; 222. Second sub-fiber Bragg grating temperature sensor; 23. Fiber Bragg grating demodulation module; 24. Optical fiber cable; 3. Molten steel level; 4. Slag level. DETAILED DESCRIPTION

[0033] In combination with the accompanying drawings and the description of the specific embodiments of the present invention, the details of the present invention can be more clearly understood. However, the specific embodiments of the present invention described herein are only used to explain the purpose of the present invention and cannot be understood as limiting the present invention in any way. Under the guidance of the present invention, technicians can conceive of any possible variations based on the present invention, which should be regarded as belonging to the scope of the present invention. It should be noted that when an element is referred to as "disposed on" another element, it can be directly on the other element or there can also be a central element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be a central element at the same time. The terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, or it can be the internal communication of two elements, it can be directly connected, or it can be indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for illustrative purposes and do not represent the only implementation method.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0035] In order to monitor the height of foam slag in real time and effectively, an electric arc furnace with a foam slag height monitoring device is proposed in this application. Figure 1 This is a schematic diagram of the principle of the foam slag height monitoring device in the utility model. Figure 2 This is a front view of an electric arc furnace with a foam slag height monitoring device in the utility model in a first embodiment, Figure 3 This is a top view of an electric arc furnace with a foam slag height monitoring device in the utility model in a first embodiment, Figure 4 This is a front view of an electric arc furnace with a foam slag height monitoring device in the utility model under a second embodiment, Figure 5 FIG. 1 is a top view of an electric arc furnace with a foam slag height monitoring device in the utility model under a second embodiment, as shown in FIG. Figures 1 to 5 As shown, an electric arc furnace with a foam slag height monitoring device may include: a furnace body 1, the furnace body 1 includes a furnace wall 11, and the furnace wall 11 is composed of a refractory material 113; a foam slag height monitoring device 2, the foam slag height monitoring device 2 includes: at least one first optical fiber 21 arranged in the refractory material 113, the first optical fiber 21 has at least one first fiber grating temperature sensor 22, and in the vertical direction, at least one first fiber grating temperature sensor 22 is provided at a preset measuring point height to detect whether the slag liquid level 4 in the furnace body 1 reaches the preset measuring point height; and a fiber grating demodulation module 23 connected to one end of the first optical fiber 21.

[0036] The electric arc furnace with a foam slag height monitoring device in the present application installs the first optical fiber 21 with the first fiber grating temperature sensor 22 into the refractory material 113 of the furnace wall 11 of the electric arc furnace body 1. During the process of carbon spraying and oxygen blowing to make foam slag in the electric arc furnace, the temperature distribution of the furnace wall 11 of the electric arc furnace is monitored by the first fiber grating temperature sensor 22, and the height of the foam slag liquid level 4 and the molten steel liquid level 3 are calculated according to the temperature distribution of the furnace wall 11. In this way, the liquid level changes in the process of smelting and slag making in the electric arc furnace can be monitored in real time, without the need to manually open the furnace door for observation, thereby reducing the heat loss caused by smelting with the furnace door open. Since the electric arc furnace obtains the position of the slag liquid level 4 in the electric arc furnace through the signal monitoring of the first fiber grating temperature sensor 22, the carbon spraying and oxygen supply parameters of the electric arc furnace can be adjusted in time according to the demand according to the carbon-oxygen reaction of the foam slag, so as to achieve efficient and green smelting in the electric arc furnace. In addition, since the first optical fiber 21 having the first fiber grating temperature sensor 22 is installed in the refractory material 113 of the furnace wall 11 of the electric arc furnace body 1, the first fiber grating temperature sensor 22 can work stably for a long time at high temperature. Finally, the first fiber grating temperature sensor 22 is used to measure the height of the foam slag liquid level 4 in the electric arc furnace, and the optical fiber sensing speed is fast and the measurement is accurate.

[0037] like Figures 2 to 4As shown, the furnace body 1 may include a furnace wall 11, and the furnace wall 11 is composed of a refractory material 113. The furnace wall 11 may include a side wall 111 and a bottom wall 112. As feasible, the side wall 111 may be composed of a refractory material 113. As feasible, the bottom wall 112 may be composed of a refractory material 113.

[0038] The foam slag height monitoring device 2 may include: at least one first optical fiber 21 disposed in the refractory material 113, and at least one first fiber grating temperature sensor 22 is provided on the first optical fiber 21. The foam slag height monitoring device 2 can indirectly infer the height of the foam slag liquid level 4 in the electric arc furnace based on the temperature indication measured by the first fiber grating temperature sensor 22. In the vertical direction, at least one first fiber grating temperature sensor 22 is provided at a preset measurement point height, and the change of the temperature measured by the first fiber grating temperature sensor 22 at the preset measurement point height reflects the change of the slag liquid level 4 in the electric arc furnace. The fiber grating demodulation module 23 is connected to the first optical fiber 21 through an optical fiber cable 24. The fiber grating demodulation module 23 is used to collect and process the received signal of the first fiber grating temperature sensor 22 through the first optical fiber 21.

[0039] When the slag liquid level 4 reaches the preset measuring point height, the temperature measured by the first fiber grating temperature sensor 22 at the preset measuring point changes significantly, and the slag making effect is achieved at this time. If the temperature measured by the first fiber grating temperature sensor 22 at the preset measuring point does not change, it means that the slag liquid level 4 has not reached the height.

[0040] As a feasible method, the first fiber grating temperature sensor 22 can be packaged with a high temperature resistant alloy. The first fiber grating temperature sensor 22 packaged with the high temperature resistant alloy is then installed in the middle of the refractory material 113 of the furnace wall 11, which can prevent the first fiber grating temperature sensor 22 from being easily damaged and can effectively ensure the heat transfer effect. Generally speaking, the operating temperature of the first fiber grating temperature sensor 22 can reach 800 degrees Celsius, and it can work stably for a long time at this temperature. When there is molten steel in the furnace body 1, the first fiber grating temperature sensor 22 is generally located below 650 degrees Celsius in the refractory material 113. Therefore, the first fiber grating temperature sensor 22 can be used to monitor the temperature, and long-term stable measurement can be achieved.

[0041] As feasible, Figures 2 to 3As shown, when the side wall 111 of the furnace wall 11 is made of a refractory material 113, the first optical fiber 21 may include a first sub-optical fiber 211. The first sub-optical fiber 211 is arranged in the refractory material 113 of the side wall 111 of the furnace wall 11, and the first sub-optical fiber 211 extends in the vertical direction. The first sub-optical fiber 211 has a plurality of first sub-fiber Bragg grating temperature sensors 221 arranged in vertical compartments, and the first fiber Bragg grating temperature sensor 22 includes the first sub-fiber Bragg grating temperature sensor 221. In the above manner, the first sub-optical fiber 211 can measure and obtain any height of the foam slag liquid level 4 and the molten steel liquid level 3 in the vertical direction, and at the same time, the distribution of the temperature of the side wall 111 of the furnace wall 11 can also be accurately obtained, so as to infer any height of the foam slag liquid level 4 and the molten steel liquid level 3.

[0042] In a specific embodiment, the spacing distance between the plurality of first sub-fiber Bragg grating temperature sensors 221 may be less than or equal to 50 mm, so as to ensure the accuracy of the measured heights of the foamy slag liquid level 4 and the molten steel liquid level 3 .

[0043] Furthermore, as feasible, the first sub-optical fiber 211 can be located at least on the opposite sides of the side wall 111 of the furnace wall 11. In this way, when the furnace body 1 is tilted, the first sub-optical fiber 211 with the first sub-fiber grating temperature sensor 221 can still measure the heights of the foam slag liquid level 4 and the molten steel liquid level 3 more accurately to avoid the negative impact of the tilt of the furnace body 1.

[0044] In other feasible embodiments, there may be a plurality of first sub-optical fibers 211, and the plurality of first sub-optical fibers 211 are spaced apart along the circumferential direction of the side wall 111 of the furnace wall 11. For example, the distance between adjacent first sub-optical fibers 211 may be less than or equal to 50 mm, so that the heights of the foamy slag liquid level 4 and the molten steel liquid level 3 are measured in all directions at various positions of the side wall 111 of the furnace wall 11.

[0045] The change of the temperature measured by the first sub-fiber Bragg grating temperature sensor 221 at different positions reflects the change of the slag liquid level 4. When the slag liquid level 4 reaches the preset measuring point height, the temperature measured by the first sub-fiber Bragg grating temperature sensor 221 at the preset measuring point changes significantly, and the slag making effect is achieved at this time. If the temperature measured by the first sub-fiber Bragg grating temperature sensor 221 at this preset measuring point does not change, it means that the foamed slag liquid level 4 has not reached the height. If the temperature measured by the first sub-fiber Bragg grating temperature sensor 221 at the measuring point above the preset measuring point also changes significantly, it means that the foamed slag height is excessive at this time, and the carbon injection and oxygen blowing intensity can be appropriately reduced.

[0046] like Figures 4 to 5As shown, when the side wall 111 of the furnace wall 11 is made of the refractory material 113 and the bottom wall 112 of the furnace wall 11 is made of the refractory material 113, the first optical fiber 21 includes a first sub-optical fiber 211, the first sub-optical fiber 211 is arranged in the refractory material 113 of the side wall 111 of the furnace wall 11, the first sub-optical fiber 211 has at least one first sub-fiber Bragg grating temperature sensor 221, the first fiber Bragg grating temperature sensor 22 includes a first sub-fiber Bragg grating temperature sensor 221, and at least one first sub-fiber Bragg grating temperature sensor 221 is provided at the preset measurement point height. The first optical fiber 21 also includes a second sub-optical fiber 212. The second sub-optical fiber 212 is arranged in the refractory material 113 of the bottom wall 112 of the furnace wall 11. The second sub-optical fiber 212 has at least one second sub-fiber Bragg grating temperature sensor 222, and the first fiber Bragg grating temperature sensor 22 includes a second sub-fiber Bragg grating temperature sensor 222.

[0047] As feasible, the second sub-fiber 212 can extend in the horizontal direction. The second sub-fiber 212 has a plurality of second sub-fiber Bragg grating temperature sensors 222 arranged in horizontal compartments. The first fiber Bragg grating temperature sensor 22 includes a second sub-fiber Bragg grating temperature sensor 222. As feasible, there are multiple second sub-fibers 212, and the multiple second sub-fibers 212 are arranged at intervals in the horizontal direction of the bottom wall 112 of the furnace wall 11. For example, the distribution direction of the multiple second sub-fibers 212 can be perpendicular to the extension direction of the second sub-fibers 212. Similarly, the distance between adjacent second sub-fibers can be less than or equal to 50 mm. In the above manner, the temperature can be measured at various different positions of the bottom wall 112 of the furnace wall 11 to obtain more accurate temperature and temperature distribution.

[0048] By arranging fiber Bragg grating temperature sensors below and above the molten steel liquid level 3, the real-time position of the liquid level can be monitored in real time through the upper and lower temperature differences. When the slag liquid level 4 exceeds the first sub-fiber Bragg grating temperature sensor 221 above the liquid level, the temperature readings measured by the first sub-fiber Bragg grating temperature sensor 221 at the measuring point and the second sub-fiber Bragg grating temperature sensor 222 at the measuring point below the liquid level are close, and the slag making effect is achieved at this time. If the temperature readings measured by the first sub-fiber Bragg grating temperature sensor 221 at this measuring point and the second sub-fiber Bragg grating temperature sensor 222 at the measuring point below the liquid level are greatly different, it means that the foam slag liquid level 4 has not reached the height. If the temperature measured by the first sub-fiber Bragg grating temperature sensor 221 at the measuring point above the measuring point at a higher position also changes significantly, it means that the foam slag height is excessive at this time, and the carbon injection and oxygen blowing intensity can be appropriately reduced.

[0049] All articles and references disclosed, including patent applications and publications, are incorporated herein by reference for various purposes. The term "consisting essentially of ... " describing a combination should include determined elements, ingredients, parts or steps and other elements, ingredients, parts or steps that do not substantially affect the basic novel features of the combination. The use of the terms "comprising" or "including" to describe the combination of elements, ingredients, parts or steps here also contemplates the implementation method consisting essentially of these elements, ingredients, parts or steps. Here, by using the term "may", it is intended to illustrate that any attribute described that "may" includes is optional. Multiple elements, ingredients, parts or steps can be provided by a single integrated element, ingredient, part or step. Alternatively, a single integrated element, ingredient, part or step can be divided into separate multiple elements, ingredients, parts or steps. The disclosure "one" or "one" used to describe an element, ingredient, part or step is not said to exclude other elements, ingredients, parts or steps.

[0050] The above are only a few embodiments of the present invention. Although the embodiments disclosed by the present invention are as above, the contents are only embodiments adopted for facilitating the understanding of the present invention and are not used to limit the present invention. Any technician in the technical field to which the present invention belongs can make any modification and change in the form and details of the implementation without departing from the spirit and scope disclosed by the present invention, but the scope of patent protection of the present invention shall still be subject to the scope defined by the attached claims.

Claims

1. An electric arc furnace with a foam slag height monitoring device, characterized in that: The electric arc furnace with a foam slag height monitoring device comprises: A furnace body, the furnace body comprising a furnace wall, the furnace wall being made of refractory material; A foam slag height monitoring device, the foam slag height monitoring device comprising: at least one first optical fiber arranged in the refractory material, the first optical fiber having at least one first fiber grating temperature sensor, and in the vertical direction, at least one first fiber grating temperature sensor at a preset measuring point height to detect whether the slag liquid level in the furnace body reaches the preset measuring point height; and a fiber grating demodulation module connected to one end of the first optical fiber.

2. The electric arc furnace with a foam slag height monitoring device according to claim 1, characterized in that: The side wall of the furnace wall is made of refractory material; The first optical fiber includes a first sub-optical fiber, the first sub-optical fiber is arranged in the refractory material of the side wall of the furnace wall, the first sub-optical fiber extends in a vertical direction, and the first sub-optical fiber has a plurality of first sub-fiber Bragg grating temperature sensors arranged in compartments along the vertical direction, and the first fiber Bragg grating temperature sensor includes a first sub-fiber Bragg grating temperature sensor.

3. The electric arc furnace with a foam slag height monitoring device according to claim 2, characterized in that: The first sub-optical fiber is located at least on two opposite sides of the side wall of the furnace wall.

4. The electric arc furnace with a foam slag height monitoring device according to claim 2, characterized in that: There are a plurality of the first sub-optical fibers, and the plurality of the first sub-optical fibers are spaced apart along the circumferential direction of the side wall of the furnace wall.

5. The electric arc furnace with a foam slag height monitoring device according to claim 2, characterized in that: The spacing distance between the plurality of the first sub-fiber Bragg grating temperature sensors is less than or equal to 50 mm.

6. The electric arc furnace with a foam slag height monitoring device according to claim 1, characterized in that: The side wall of the furnace wall is made of refractory material; the bottom wall of the furnace wall is made of refractory material; The first optical fiber includes a first sub-optical fiber, the first sub-optical fiber is arranged in the refractory material of the side wall of the furnace wall, the first sub-optical fiber has at least one first sub-fiber Bragg grating temperature sensor, the first fiber Bragg grating temperature sensor includes a first sub-fiber Bragg grating temperature sensor, and at least one first sub-fiber Bragg grating temperature sensor is provided at a preset measurement point height; The first optical fiber also includes a second sub-optical fiber, which is arranged in the refractory material of the bottom wall of the furnace wall. The second sub-optical fiber has at least one second sub-fiber Bragg grating temperature sensor, and the first fiber Bragg grating temperature sensor includes the second sub-fiber Bragg grating temperature sensor.

7. The electric arc furnace with a foam slag height monitoring device according to claim 6, characterized in that: The second sub-fiber extends in a horizontal direction. The second sub-fiber has a plurality of second sub-fiber Bragg grating temperature sensors arranged in horizontal compartments. The first fiber Bragg grating temperature sensor includes the second sub-fiber Bragg grating temperature sensor.

8. The electric arc furnace with a foam slag height monitoring device according to claim 6, characterized in that: There are a plurality of the second sub-optical fibers, and the plurality of the second sub-optical fibers are spaced apart along the horizontal direction of the bottom wall of the furnace wall.

9. The electric arc furnace with a foam slag height monitoring device according to claim 1, characterized in that: The first fiber grating temperature sensor is packaged with a high temperature resistant alloy.

10. The electric arc furnace with a foam slag height monitoring device according to claim 9, characterized in that: The working temperature of the first fiber grating temperature sensor reaches 800 degrees Celsius; when there is molten steel in the furnace body, the first fiber grating temperature sensor is located at a position below 650 degrees Celsius in the refractory material.

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