Furnace shell temperature measuring device of electric arc furnace

Abstract

The utility model discloses a furnace shell temperature measuring device of an electric arc furnace, which relates to the technical field of metallurgy, and the electric arc furnace with a foam slag height monitoring device comprises a furnace shell, a temperature measuring device and a temperature measuring device, a plurality of temperature measuring bases are arranged on the outer wall surface, heat can be conducted between the temperature measuring bases and the outer wall surface, and the temperature measuring bases are distributed in the circumferential direction of the outer wall surface and distributed in the vertical direction of the outer wall surface; the temperature detection system comprises at least one first optical fiber, the first optical fiber is provided with a plurality of first fiber bragg grating temperature sensors, and the plurality of first fiber bragg grating temperature sensors are respectively arranged at the plurality of temperature measurement bases so as to detect the temperature of the plurality of temperature measurement bases; and the fiber bragg grating demodulation module is connected to one end of the first optical fiber. According to the invention, the foam slag and the liquid level height can be indirectly monitored in real time.

Description

Technical Field

[0001] The utility model relates to the technical field of metallurgy, in particular to a furnace shell temperature measuring device for an electric arc furnace. Background Art

[0002] Electric arc furnace steelmaking has become an important means of steelmaking at present 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 the publication number CN213120152U discloses a temperature measuring device for the furnace shell of an electric furnace, comprising an L-shaped support rod, a moving block is sleeved on the horizontal section of the support rod, and an infrared thermometer is arranged on the moving block; an adjusting cylinder is fixed on a side surface of the moving block close to the vertical section of the support rod; the adjusting cylinder is sleeved on the horizontal section; an adjusting rod mechanism is hinged between the adjusting cylinder and the vertical section; the adjusting rod mechanism comprises a pair of adjusting rods hinged to each other. The utility model uses an adjusting rod mechanism, which drives the adjusting cylinder to move along the horizontal section of the support rod, and the adjusting cylinder drives the moving block to move along the horizontal section, so as to achieve the moving block approaching or moving away from the furnace wall of the electric furnace, and after the moving block is adjusted to a suitable position, the infrared thermometer fixed on the moving block obtains the temperature of the furnace wall of the electric furnace. Therefore, the device can adjust the distance between the furnace wall and the infrared thermometer, and there is no need for manual maintenance of the wire. The purpose of this technical solution is to provide an electric furnace shell temperature measuring device, which uses a non-contact infrared detection method after improvement, and the distance between the infrared thermometer and the electric furnace is adjustable, the detection accuracy is improved and maintenance is free, eliminating safety hazards.

[0004] In the above technology, there are two problems. First, when infrared temperature measurement is used to measure the furnace shell temperature, the infrared temperature measurement device cannot be installed in a suitable position. If the distance is too close, it may be easily damaged, and if the distance is too far, the measurement is not accurate enough. Second, due to the complex smelting conditions on the electric arc furnace site, multiple furnace shell points need to be selected for measurement, and this method cannot accurately measure. 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 furnace shell temperature measurement device for the electric arc furnace, so that the height of the foam slag can be indirectly obtained, and the height of the foam slag can be monitored in real time to 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 a furnace shell temperature measuring device for an electric arc furnace, which can indirectly monitor the foam slag and liquid level in real time.

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

[0007] A furnace shell temperature measuring device for an electric arc furnace, the furnace shell temperature measuring device for an electric arc furnace comprising:

[0008] A furnace shell, the furnace shell having an outer wall surface; a plurality of temperature measuring bases are arranged on the outer wall surface, the temperature measuring bases and the outer wall surface can conduct heat, and the plurality of temperature measuring bases are distributed around the circumference of the outer wall surface and along the vertical direction of the outer wall surface;

[0009] A temperature detection system, the temperature detection system comprising: at least one first optical fiber, the first optical fiber having a plurality of first fiber Bragg grating temperature sensors, the plurality of first fiber Bragg grating temperature sensors being respectively arranged at a plurality of the temperature measuring bases to detect the temperatures at the plurality of the temperature measuring bases; and a fiber Bragg grating demodulation module connected to one end of the first optical fiber.

[0010] Preferably, the temperature measuring base is arranged in close contact with the outer wall surface;

[0011] The temperature measuring base is provided with a through channel; the first optical fiber passes through the channel; and the first fiber grating temperature sensor is arranged in the channel.

[0012] Preferably, the first optical fiber includes a plurality of first sub-optical fibers, and the plurality of first sub-optical fibers are connected to the fiber Bragg grating demodulation module via an optical fiber cable;

[0013] The first sub-fiber grating temperature sensors are arranged on the first sub-fiber, and the first fiber grating temperature sensor includes the first sub-fiber grating temperature sensors.

[0014] Preferably, the plurality of temperature measuring bases are divided into a plurality of groups of temperature measuring bases, and each group of temperature measuring bases includes a plurality of the temperature measuring bases;

[0015] The plurality of temperature measuring bases in each group of temperature measuring bases are distributed around the outer wall at the same height; the plurality of groups of temperature measuring bases are arranged in a vertical direction on the outer wall;

[0016] The plurality of the first sub-optical fibers are respectively passed through the plurality of the temperature measuring bases in a corresponding group of temperature measuring bases; the plurality of the first sub-fiber grating temperature sensors on each of the first sub-optical fibers are respectively arranged at the temperature measuring bases in a corresponding group of temperature measuring bases.

[0017] Preferably, a plurality of groups of temperature measuring bases extend downward from the upper end of the side wall of the outer wall to the bottom wall of the outer wall at the outer wall.

[0018] Preferably, the spacing between adjacent temperature measuring bases in each group of temperature measuring bases is less than or equal to 50 mm; the spacing between adjacent groups of temperature measuring bases in the first area is less than or equal to 200 mm, and the spacing between adjacent groups of temperature measuring bases in the second area is less than or equal to 50 mm; the second area includes the area near the molten steel surface and the area above it under normal operation; the first area includes the area below the molten steel surface under normal operation.

[0019] Preferably, the plurality of temperature measuring bases are divided into a plurality of groups of temperature measuring bases, and each group of temperature measuring bases includes a plurality of the temperature measuring bases;

[0020] A plurality of the temperature measuring bases in each group of temperature measuring bases are arranged in a vertical direction on the outer wall surface; and a plurality of groups of temperature measuring bases are distributed circumferentially around the outer wall surface;

[0021] The plurality of the first sub-optical fibers are respectively passed through the plurality of the temperature measuring bases in a corresponding group of temperature measuring bases; the plurality of the first sub-fiber grating temperature sensors on each of the first sub-optical fibers are respectively arranged at the temperature measuring bases in a corresponding group of temperature measuring bases.

[0022] Preferably, a plurality of the temperature measuring bases in each group of temperature measuring bases extend downward from the upper end of the side wall of the outer wall to the bottom wall of the outer wall at the outer wall.

[0023] Preferably, the spacing between adjacent groups of temperature measuring bases is less than or equal to 500 mm, and the spacing between adjacent temperature measuring bases in each group of temperature measuring bases is less than or equal to 50 mm.

[0024] Preferably, the first fiber grating temperature sensor is packaged with a high temperature resistant alloy; the operating temperature of the first fiber grating temperature sensor reaches 800 degrees Celsius; when there is molten steel in the electric arc furnace, the temperature at the temperature measuring base where the first fiber grating temperature sensor is located is less than or equal to 450 degrees Celsius.

[0025] The technical solution of the utility model has the following significant beneficial effects:

[0026] 1. The furnace shell temperature measuring device of the electric arc furnace in the present application installs the first optical fiber with the first fiber grating temperature sensor on the outer wall surface of the furnace shell, and arranges the first fiber grating temperature sensor on the temperature measuring base on the outer wall surface of the furnace shell, so that the temperature detection system can obtain the temperature of the outer wall surface of the furnace shell at different positions in the circumferential direction and the vertical direction in real time through the fiber grating demodulation module, and the height of the foam slag liquid level and the molten steel liquid level can be indirectly obtained according to the real-time monitored furnace shell temperature, so that the liquid level changes in the arc furnace smelting and slag making process can be monitored in real time, without manually opening the furnace door for observation, reducing the heat loss caused by smelting with the furnace door open. Since the electric arc furnace indirectly obtains the position of the foam slag liquid level in the electric arc furnace through the signal monitoring of the first fiber grating temperature sensor, the carbon injection 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.

[0027] 2. In addition, since the first optical fiber with the first fiber Bragg grating temperature sensor is installed on the outer wall of the arc furnace shell, the first fiber Bragg grating temperature sensor can work stably for a long time at high temperature.

[0028] 3. Finally, the first fiber grating temperature sensor is used to indirectly measure the height of the foam slag liquid level in the arc furnace. The fiber optic sensing speed is fast and the measurement is accurate.

[0029] 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

[0030] 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.

[0031] Figure 1 It is a front view of the furnace shell temperature measuring device of the electric arc furnace in the embodiment of the utility model under the first implementation mode;

[0032] Figure 2 It is a front view of the furnace shell temperature measuring device of the electric arc furnace in the embodiment of the utility model under the second implementation mode;

[0033] Figure 3 This is a schematic diagram of the structure of the connection between the temperature measuring base and the furnace shell in the embodiment of the utility model;

[0034] Figure 4 It is a schematic diagram of the principle of the temperature detection system in an embodiment of the utility model under a feasible implementation mode.

[0035] Reference numerals in the above drawings:

[0036] 1. furnace shell; 11. outer wall; 111. side wall; 112. bottom wall; 12. temperature measuring base; 2. temperature detection system; 21. first optical fiber; 211. first sub-optical fiber; 22. first fiber Bragg grating temperature sensor; 221. first sub-fiber Bragg grating temperature sensor; 23. fiber Bragg grating demodulation module; 24. optical fiber cable. DETAILED DESCRIPTION

[0037] 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.

[0038] 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.

[0039] In order to indirectly monitor the foam slag and liquid level in real time, a furnace shell temperature measuring device for an electric arc furnace is proposed in this application. Figure 1This is a front view of the furnace shell temperature measuring device of the electric arc furnace in the first embodiment of the utility model. Figure 2 This is a front view of the furnace shell temperature measuring device of the electric arc furnace in the second embodiment of the utility model, Figure 3 Schematic diagram of the structure of the temperature measuring base connected to the furnace shell in the embodiment of the utility model, as shown in FIG. Figures 1 to 3 As shown, the furnace shell temperature measuring device of the electric arc furnace may include: a furnace shell 1, the furnace shell 1 has an outer wall surface 11; a plurality of temperature measuring bases 12 are arranged on the outer wall surface 11, the temperature measuring bases 12 and the outer wall surface 11 can conduct heat, and the plurality of temperature measuring bases 12 are distributed around the circumference of the outer wall surface 11 and distributed along the vertical direction of the outer wall surface 11; a temperature detection system 2, the temperature detection system 2 includes: at least one first optical fiber 21, the first optical fiber 21 has a plurality of first fiber grating temperature sensors 22, and the plurality of first fiber grating temperature sensors 22 are respectively arranged at a plurality of temperature measuring bases 12 to detect the temperatures at the plurality of temperature measuring bases 12; and a fiber grating demodulation module 23 connected to one end of the first optical fiber 21.

[0040] The furnace shell temperature measuring device of the electric arc furnace in the present application installs the first optical fiber 21 with the first fiber grating temperature sensor 22 on the outer wall surface 11 of the furnace shell 1, and sets the first fiber grating temperature sensor 22 on the temperature measuring base 12 on the outer wall surface 11 of the furnace shell 1, so that the temperature detection system 2 can obtain the temperature of the outer wall surface 11 of the furnace shell 1 at different positions in the circumferential direction and the vertical direction in real time through the fiber grating demodulation module 23, and the height of the foam slag liquid level and the molten steel liquid level can be indirectly obtained according to the real-time monitored temperature of the furnace shell 1, so that the liquid level changes in the arc furnace smelting and slag making process can be monitored in real time, without manually opening the furnace door for observation, reducing the heat loss caused by smelting with the furnace door opened. Since the electric arc furnace indirectly obtains the position of the foam slag liquid level in the electric arc furnace through the signal monitoring of the first fiber grating temperature sensor 22, the carbon injection 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 21 with the first fiber grating temperature sensor 22 is installed on the outer wall surface 11 of the arc furnace shell 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 indirectly measure the height of the foam slag liquid level in the arc furnace, and the optical fiber sensing speed is fast and the measurement is accurate.

[0041] like Figures 1 to 3As shown, the furnace shell 1 may have an outer wall surface 11. The outer wall surface 11 may include a side wall 111 and a bottom wall 112. A plurality of temperature measuring bases 12 may be provided on the outer wall surface 11, and the temperature measuring base 12 is used to fix a first optical fiber 21 having a plurality of first fiber grating temperature sensors 22, and the first fiber grating temperature sensors 22 can detect the temperature at the temperature measuring base 12 to reflect the temperature at this position of the outer wall surface 11 of the furnace shell 1. The temperature measuring base 12 and the outer wall surface 11 can conduct heat, and the heat conduction is efficient heat conduction. For example, the temperature measuring base 12 may be in close contact with the outer wall surface 11, or a heat conducting material may be provided between the two to achieve efficient heat conduction. When the temperature measuring base 12 and the outer wall surface 11 are both made of metal materials, the temperature measuring base 12 may be welded to the outer wall surface 11. In other feasible embodiments, the temperature measuring base 12 may be fixed to the outer wall surface 11 by a fixing member such as a bolt or a screw.

[0042] like Figures 1 to 3 As shown, a plurality of temperature measuring bases 12 are distributed around the circumference of the outer wall surface 11 and along the vertical direction of the outer wall surface 11, so that the first fiber grating temperature sensor 22 can measure the temperature of the outer wall surface 11 of the furnace shell 1 at different positions in the circumferential direction and the vertical direction, so that the height of the foam slag liquid level and the molten steel liquid level can be more accurately indirectly obtained based on the real-time monitored temperature of the furnace shell 1.

[0043] The temperature detection system 2 may include: at least one first optical fiber 21, on which are provided a plurality of first fiber grating temperature sensors 22, which are respectively arranged at a plurality of temperature measuring bases 12 to detect the temperatures at the plurality of temperature measuring bases 12; and a fiber grating demodulation module 23 connected to one end of the first optical fiber 21.

[0044] As feasible, Figure 4 FIG. 1 is a schematic diagram of the principle of the temperature detection system in the embodiment of the utility model in a feasible implementation mode. Figure 4 As shown, a through channel may be provided on the temperature measuring base 12. The first optical fiber 21 passes through the channel, so that the temperature measuring base 12 can fix the first optical fiber 21. The first fiber grating temperature sensor 22 can be arranged in the channel, so that on the one hand, the first fiber grating temperature sensor 22 can detect the temperature at the temperature measuring base 12, and on the other hand, the first fiber grating temperature sensor 22 can be protected to prevent it from being damaged.

[0045] The fiber Bragg grating demodulation module 23 is connected to the first optical fiber 21 through the optical fiber cable 24. The fiber Bragg grating demodulation module 23 is used to collect and process the signal received from the first fiber Bragg grating temperature sensor 22 through the first optical fiber 21.

[0046] 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 a high temperature resistant alloy is then arranged at multiple temperature measuring bases 12, for example, in a channel running through the temperature measuring base 12. This can further 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 electric arc furnace, the temperature at the temperature measuring base 12 where the first fiber grating temperature sensor 22 is located is less than or equal to 450 degrees Celsius. Therefore, the first fiber grating temperature sensor 22 can be used to monitor the temperature, and long-term stable measurement can be achieved.

[0047] Since it is inconvenient to arrange all the temperature measuring bases 12 of the outer wall surface 11 of the furnace shell 1 for a single first optical fiber 21, and it is inconvenient to position each first fiber grating temperature sensor 22 on the first optical fiber 21 on different temperature measuring bases 12, therefore, in a feasible embodiment, the first optical fiber 21 includes a plurality of first sub-optical fibers 211, and the plurality of first sub-optical fibers 211 are connected to the fiber grating demodulation module 23 through an optical fiber cable 24. The plurality of first sub-optical fibers 211 are arranged in parallel. Each first sub-optical fiber 211 has a plurality of first sub-fiber grating temperature sensors 221, and the first fiber grating temperature sensor 22 includes a plurality of first sub-fiber grating temperature sensors 221. Different first sub-optical fibers 211 can pass through the temperature measuring base 12 of a specific part of the outer wall surface 11 of the furnace shell 1, so as to facilitate the position determination of different first fiber grating temperature sensors 22 on a certain first sub-optical fiber 211 on the temperature measuring base 12 on the outer wall surface 11 of the furnace shell 1.

[0048] In one embodiment, Figure 1 As shown, multiple temperature measuring bases 12 are divided into multiple groups of temperature measuring bases, and each group of temperature measuring bases includes multiple temperature measuring bases 12. Multiple temperature measuring bases 12 in each group of temperature measuring bases are distributed around the outer wall surface 11 at the same height. Multiple groups of temperature measuring bases are arranged in a vertical direction at the outer wall surface 11. Multiple first sub-optical fibers 211 are respectively passed through multiple temperature measuring bases 12 in a corresponding group of temperature measuring bases. Multiple first sub-fiber grating temperature sensors 221 on each first sub-optical fiber 211 are respectively arranged at the temperature measuring base 12 in the corresponding group of temperature measuring bases.

[0049] A plurality of groups of temperature measuring bases extend downward from the upper end of the side wall 111 of the outer wall 11 to the bottom wall 112 of the outer wall 11 , so that the temperature information at different positions of the outer wall 11 of the furnace shell 1 can be detected in all directions.

[0050] In this embodiment, the spacing between adjacent temperature measuring bases 12 in each group of temperature measuring bases is less than or equal to 50 mm. The spacing between adjacent groups of temperature measuring bases in the first area is less than or equal to 200 mm, and the spacing between adjacent groups of temperature measuring bases in the second area is less than or equal to 50 mm. The second area includes the area near the steel liquid surface and the area above it under normal operation; the first area includes the area below the steel liquid surface under normal operation. The above method can improve the accuracy of measurement and reduce the number of temperature measuring bases 12 arranged and the number of first sub-fiber grating temperature sensors 221 as much as possible.

[0051] In another embodiment, if Figure 2 As shown, a plurality of temperature measuring bases 12 are divided into a plurality of groups of temperature measuring bases, and each group of temperature measuring bases includes a plurality of temperature measuring bases 12. The plurality of temperature measuring bases 12 in each group of temperature measuring bases are arranged in a vertical direction at the outer wall surface 11. The plurality of groups of temperature measuring bases are distributed circumferentially around the outer wall surface 11. The plurality of first sub-optical fibers 211 are respectively passed through the plurality of temperature measuring bases 12 in a corresponding group of temperature measuring bases. The plurality of first sub-fiber grating temperature sensors 221 on each first sub-optical fiber 211 are respectively arranged at the temperature measuring base 12 in a corresponding group of temperature measuring bases.

[0052] The multiple temperature measuring bases 12 in each group of temperature measuring bases extend downward from the upper end of the side wall 111 of the outer wall 11 to the bottom wall 112 of the outer wall 11, so that the temperature information at different positions of the outer wall 11 of the furnace shell 1 can be fully detected.

[0053] In this embodiment, the spacing between adjacent groups of temperature measuring bases is less than or equal to 500 mm, and the spacing between adjacent temperature measuring bases 12 in each group of temperature measuring bases is less than or equal to 50 mm. The above method can improve the accuracy of measurement.

[0054] In all the above embodiments, the first optical fiber 21 with multiple first fiber Bragg grating temperature sensors 22 is installed at different positions of the outer wall surface 11 of the furnace shell 1 to ensure the accuracy of measurement, and the temperature change at each height and position of the outer wall surface 11 of the furnace shell 1 can be monitored at the same time. The signal is transmitted to the fiber Bragg grating demodulation module 23 through the measurement point signal, the first fiber Bragg grating temperature sensor 22, and the optical fiber cable, so that the temperature at each height and position of the outer wall surface 11 of the furnace shell 1 can be obtained. Figure 3As shown, the change in the temperature of the measuring point indirectly reflects the height change of the foam slag liquid level and the molten steel liquid level. When the foam slag liquid level reaches the theoretical measuring point height, the temperature of the measuring point is close to the measuring temperature of the measuring point at the bottom of the furnace shell 1, and the slag making effect is achieved at this time. If the temperature of this measuring point does not change, it means that the foam slag liquid level has not reached the height. If the temperature of the measuring point above the measuring point also changes significantly, that is, it is close to the temperature of the measuring point at the bottom of the furnace shell 1 or the temperature is significantly increased, it means that the foam slag height is excessive at this time. The position of the foam slag liquid level can be indirectly obtained according to the real-time monitored furnace shell 1 temperature, so as to timely adjust the carbon injection and oxygen supply according to the foam slag height required for actual smelting, and realize efficient and green smelting.

[0055] 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.

[0056] 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. A furnace shell temperature measuring device for an electric arc furnace, characterized in that: The furnace shell temperature measuring device of the electric arc furnace comprises: A furnace shell, the furnace shell having an outer wall surface; a plurality of temperature measuring bases are arranged on the outer wall surface, the temperature measuring bases and the outer wall surface can conduct heat, and the plurality of temperature measuring bases are distributed around the circumference of the outer wall surface and along the vertical direction of the outer wall surface; A temperature detection system, the temperature detection system comprising: at least one first optical fiber, the first optical fiber having a plurality of first fiber Bragg grating temperature sensors, the plurality of first fiber Bragg grating temperature sensors being respectively arranged at a plurality of the temperature measuring bases to detect the temperatures at the plurality of the temperature measuring bases; and a fiber Bragg grating demodulation module connected to one end of the first optical fiber.

2. The furnace shell temperature measuring device of an electric arc furnace according to claim 1, characterized in that: The temperature measuring base is arranged in close contact with the outer wall surface; The temperature measuring base is provided with a through channel; the first optical fiber passes through the channel; and the first fiber grating temperature sensor is arranged in the channel.

3. The furnace shell temperature measuring device of an electric arc furnace according to claim 1, characterized in that: The first optical fiber includes a plurality of first sub-optical fibers, and the plurality of first sub-optical fibers are connected to the fiber Bragg grating demodulation module via an optical fiber cable; The first sub-fiber grating temperature sensors are arranged on the first sub-fiber, and the first fiber grating temperature sensor includes the first sub-fiber grating temperature sensors.

4. The furnace shell temperature measuring device of an electric arc furnace according to claim 3, characterized in that: The plurality of temperature measuring bases are divided into a plurality of groups of temperature measuring bases, and each group of temperature measuring bases includes a plurality of the temperature measuring bases; The plurality of temperature measuring bases in each group of temperature measuring bases are distributed around the outer wall at the same height; the plurality of groups of temperature measuring bases are arranged in a vertical direction on the outer wall; The plurality of the first sub-optical fibers are respectively passed through the plurality of the temperature measuring bases in a corresponding group of temperature measuring bases; the plurality of the first sub-fiber grating temperature sensors on each of the first sub-optical fibers are respectively arranged at the temperature measuring bases in a corresponding group of temperature measuring bases.

5. The furnace shell temperature measuring device of an electric arc furnace according to claim 4, characterized in that: A plurality of groups of temperature measuring bases extend downward from the upper end of the side wall of the outer wall to the bottom wall of the outer wall at the outer wall.

6. The furnace shell temperature measuring device of an electric arc furnace according to claim 4, characterized in that: The spacing between adjacent temperature measuring bases in each group of temperature measuring bases is less than or equal to 50 mm; the spacing between adjacent groups of temperature measuring bases in the first area is less than or equal to 200 mm, and the spacing between adjacent groups of temperature measuring bases in the second area is less than or equal to 50 mm; the second area includes the area near the molten steel surface and above under normal operation; the first area includes the area below the molten steel surface under normal operation.

7. The furnace shell temperature measuring device of an electric arc furnace according to claim 3, characterized in that: The plurality of temperature measuring bases are divided into a plurality of groups of temperature measuring bases, and each group of temperature measuring bases includes a plurality of the temperature measuring bases; A plurality of the temperature measuring bases in each group of temperature measuring bases are arranged in a vertical direction on the outer wall surface; and a plurality of groups of temperature measuring bases are distributed circumferentially around the outer wall surface; The plurality of the first sub-optical fibers are respectively passed through the plurality of the temperature measuring bases in a corresponding group of temperature measuring bases; the plurality of the first sub-fiber grating temperature sensors on each of the first sub-optical fibers are respectively arranged at the temperature measuring bases in a corresponding group of temperature measuring bases.

8. The furnace shell temperature measuring device of an electric arc furnace according to claim 7, characterized in that: A plurality of the temperature measuring bases in each group of temperature measuring bases extend downward from the upper end of the side wall of the outer wall to the bottom wall of the outer wall at the outer wall surface.

9. The furnace shell temperature measuring device of an electric arc furnace according to claim 7, characterized in that: The spacing between adjacent groups of temperature measuring bases is less than or equal to 500 mm, and the spacing between adjacent temperature measuring bases in each group of temperature measuring bases is less than or equal to 50 mm.

10. The furnace shell temperature measuring device of an electric arc furnace according to claim 1, characterized in that: The first fiber grating temperature sensor is packaged with a high temperature resistant alloy; the operating temperature of the first fiber grating temperature sensor reaches 800 degrees Celsius; when there is molten steel in the electric arc furnace, the temperature at the temperature measuring base where the first fiber grating temperature sensor is located is less than or equal to 450 degrees Celsius.

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