Blast furnace oven firing tuyere thermocouple fixing device

Abstract

This invention discloses a thermocouple fixing device for blast furnace tuyeres, belonging to the technical field of ironmaking equipment. It includes a shell, with a refractory filling layer connected to the inner wall of the shell. The refractory filling layer has a cavity, with a thermocouple hole at one end. The cavity adjacent to the thermocouple hole gradually increases in size from the inside out, forming a funnel opening. An elastic clamping member is provided on the refractory filling layer near the thermocouple hole opening. The thermocouple fixing device of this invention is directly nested inside the blast furnace direct-blowing pipe, eliminating the need for drilling and facilitating operation. One end of the thermocouple is inserted into the direct-blowing pipe through a valve plate on the pipe. As the thermocouple moves forward, one end first enters the funnel opening. Even if one end of the thermocouple is not aligned with the thermocouple hole, it can gradually slide into the hole along the inner wall of the funnel opening, avoiding the problem of the thermocouple being too long and unable to be aligned. After the front end of the thermocouple passes through the thermocouple hole, it is limited and fixed by the elastic clamping member.

Description

Technical Field

[0001] This invention relates to the field of ironmaking equipment technology, and more specifically, to a thermocouple fixing device for blast furnace tuyeres. Background Technology

[0002] A blast furnace is a smelting equipment that places iron ore inside and processes it at high temperatures to obtain pig iron. In the smelting industry, the blast furnace plays a very important role and is widely used. The most basic reason why a blast furnace can smelt pig iron is the high temperature. Therefore, it is necessary to accurately control the temperature at all times during the use of a blast furnace.

[0003] To accurately measure the temperature of a blast furnace during operation, thermocouples are typically used. A thermocouple converts a temperature signal into a thermoelectric potential signal, which is then converted into the temperature of the measured medium by electrical instruments. Currently, most methods for installing thermocouples inside blast furnaces involve using perforations.

[0004] For example, patent CN207210466U discloses a thermocouple installation device for blast furnace drying. This solution involves drilling a hole in the hot air duct, inserting a thermocouple installation pipe, and fixing it in place. The thermocouple passes through the pipe and a ball valve into the hot air duct for temperature measurement. However, the tuyere area mainly consists of a fixed large tuyere sleeve and detachable medium and small tuyere sleeves and a direct-blowing pipe, which are assembled from the inside out. It is not possible to drill holes to fix the thermocouple in place; the thermocouple can only be installed after the direct-blowing pipe is installed.

[0005] Patent CN105671232B discloses an online installation process for thermocouples in blast furnaces. This process involves drilling holes in the furnace lining surface using a drilling machine, installing the thermocouples, and finally filling the lining with grout. This method requires drilling holes in the furnace lining, which disrupts the integrity of the blast furnace shell and cooling walls, and involves numerous steps.

[0006] In addition, there are the following problems with installing thermocouples in blast furnaces: when installing thermocouples in the direct blowing pipe of the blast furnace tuyere, the thermocouple is long and its front end is difficult to align with the thermocouple hole, which makes the installation inconvenient; the existing thermocouple fixing device is prone to deformation and failure under high temperature conditions; and it is not possible to intuitively judge the insertion depth when inserting the thermocouple into the thermocouple hole. Summary of the Invention

[0007] 1. The technical problem that the invention aims to solve

[0008] The purpose of this invention is to overcome the shortcomings of existing technologies where the installation of thermocouples at blast furnace tuyeres is difficult, and to provide a thermocouple fixing device for blast furnace tuyeres during the drying process. This solution, through improvements to the structure of the thermocouple fixing device, reduces the installation difficulty of the thermocouples at the blast furnace tuyeres during the drying process, while also improving the durability of the fixing device.

[0009] 2. Technical Solution

[0010] To achieve the above objectives, the technical solution provided by the present invention is as follows:

[0011] The present invention provides a thermocouple fixing device for blast furnace tuyeres, comprising an outer shell, an inner wall of which is connected to a refractory filling layer, the refractory filling layer having a cavity, one end of which is provided with a thermocouple hole, the cavity adjacent to the thermocouple hole gradually increasing in size from the inside to the outside to form a funnel opening, and an elastic clamping member provided on the refractory filling layer near the opening of the thermocouple hole.

[0012] Furthermore, the elastic clamping member includes spring plates symmetrically arranged at the opening of the thermocouple hole. The spring plates are connected to the refractory filling layer through mounting plates, and the mounting plates are fixedly connected to the refractory filling layer.

[0013] Furthermore, the spacing between the spring plates is smaller than the outer diameter of the thermocouple.

[0014] Furthermore, the end of the spring sheet near the mounting plate is bent outward to form a connecting piece, and the spring sheet is fixed to the mounting plate through the connecting piece.

[0015] Furthermore, the mounting plate has connection holes at different heights, and the connecting plate has mounting holes corresponding to the connection holes.

[0016] Furthermore, the end of the spring sheet furthest from the mounting plate is bent outward to form an extension sheet.

[0017] Furthermore, the spring sheet is coated with a protective layer, which includes an insulating layer to improve the insulation resistance of the spring sheet surface.

[0018] Furthermore, the protective layer includes an antioxidant layer to isolate air and moisture.

[0019] Furthermore, the protective layer includes a heat insulation layer to prevent the spread of heat.

[0020] Furthermore, the protective layer includes a wear-resistant layer to reduce wear on the spring sheet.

[0021] 3. Beneficial effects

[0022] Compared with the prior art, the technical solution provided by this invention has the following advantages:

[0023] (1) The fixing device is directly nested inside the blast furnace direct-blowing pipe, requiring no drilling and making operation convenient. The outer end of the fixing device's outer shell contacts the inner wall of the direct-blowing pipe. One end of the thermocouple is inserted into the direct-blowing pipe through the insert valve on the pipe. As the thermocouple moves, one end first enters the funnel opening. Even if one end of the thermocouple is not aligned with the thermocouple hole, it can gradually slide into the thermocouple hole along the inner wall of the funnel opening, avoiding the problem of the thermocouple being too long to be aligned with the thermocouple hole.

[0024] (2) After the thermocouple enters the thermocouple hole, it gradually passes through the thermocouple hole as it moves. The refractory filling layer has two spring plates near the opening of the thermocouple hole, and the distance between the two spring plates is smaller than the outer diameter of the thermocouple. When the thermocouple comes into contact with the spring plates, it will gradually spread the two spring plates apart, and the elastic force of the spring plates will gradually increase. The elastic force of the spring plates can clamp and fix the thermocouple.

[0025] (3) The rebound force of the spring plates makes the movement of the thermocouple resistant. By feeling the resistance when the thermocouple passes through the two spring plates, the depth of thermocouple insertion can be determined.

[0026] (4) One end of each of the two spring plates has an extension plate. The two extension plates are in an open state, which can prevent the thermocouple from being stuck by the spring plates when it moves back and cannot be pulled out.

[0027] (5) The refractory filling layer is made of carbon composite refractory material, which has good fire resistance and high temperature resistance. It will not deform even after long-term use in high temperature environment. In addition, the spring sheet is equipped with a protective layer, which specifically includes an insulation layer, an anti-oxidation layer, a heat insulation layer and a wear-resistant layer to prevent device failure. Attached Figure Description

[0028] Figure 1 A perspective view of the thermocouple fixing device at the blast furnace tuyeres.

[0029] Figure 2 A schematic diagram of the thermocouple fixing device at the tuyeres of a blast furnace from another perspective;

[0030] Figure 3 A cross-sectional view of the thermocouple fixing device at the blast furnace tuyeres.

[0031] Figure 4 This is a schematic diagram showing the connection between the spring plate and the mounting plate;

[0032] Figure 5 This is a schematic diagram of the protective structure on the spring sheet.

[0033] Explanation of the labels in the diagram:

[0034] 1. Outer shell; 2. Coil hole; 3. Refractory filling layer; 4. Funnel mouth; 5. Spring plate; 6. Mounting plate; 7. Extension plate; 8. Connecting plate; 9. Connecting hole; 10. Insulation layer; 11. Antioxidant layer; 12. Heat insulation layer; 13. Wear-resistant layer. Detailed Implementation

[0035] To further understand the content of this invention, a detailed description of the invention will be provided in conjunction with the accompanying drawings and embodiments.

[0036] The structures, proportions, and sizes illustrated in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art in understanding and reading the invention. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the technical content disclosed herein. Furthermore, terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and not intended to limit the scope of implementation. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0037] Example 1

[0038] like Figures 1-3 As shown in this embodiment, a thermocouple fixing device for a blast furnace tuyeres includes a housing 1, with a refractory filling layer 3 connected to the inner wall of the housing 1. The refractory filling layer 3 has a cavity, with a thermocouple hole 2 at one end. The cavity adjacent to the thermocouple hole 2 gradually increases in size from the inside out to form a funnel opening 4. Even if one end of the thermocouple is not aligned with the thermocouple hole 2, it can gradually slide into the thermocouple hole 2 along the inner wall of the funnel opening 4. An elastic clamping member is provided on the refractory filling layer near the opening of the thermocouple hole 2 for clamping and fixing the thermocouple.

[0039] Specifically, the elastic clamping component includes a set of spring plates 5 symmetrically arranged at the opening of the thermocouple hole 2. The spring plates 5 are connected to the refractory filling layer 3 via mounting plates 6, and the mounting plates 6 are fixedly connected to the refractory filling layer 3. The spacing between the spring plates 5 is smaller than the outer diameter of the thermocouple.

[0040] The specific application scenario of the fixing device in this embodiment is as follows: The device is installed in the direct blowing pipe of the blast furnace, with the outer end of the outer shell 1 in contact with the inner wall of the direct blowing pipe. One end of the thermocouple is inserted into the direct blowing pipe through the insert valve on the direct blowing pipe. As the thermocouple moves continuously, one end of the thermocouple first enters the funnel-shaped opening 4, and then gradually slides into the thermocouple hole 2 under the guidance of the inner wall of the funnel opening 4.

[0041] When the thermocouple enters the thermocouple hole 2, it gradually passes through the thermocouple hole 2 as it moves. After the spring sheet 5 on the end face of the refractory filling layer 3 comes into contact with the thermocouple, it will be gradually stretched apart. The distance between the two spring sheets 5 gradually increases, and the elastic force of the spring sheet 5 also gradually increases. The elastic force of the spring sheet 5 can clamp and fix the thermocouple.

[0042] Meanwhile, the elasticity of the spring plate 5 also creates resistance to the movement of the thermocouple. By feeling the resistance when the thermocouple passes through the two spring plates 5, the insertion depth of the thermocouple can be determined, which is very convenient. In addition, the refractory filling layer 3 is made of carbon composite refractory material, which has good fire resistance and high temperature resistance. It will not deform even after long-term use in high-temperature environments, thus preventing the device from failing and improving its service life.

[0043] Example 2

[0044] The basic structure of this embodiment is the same as that of the embodiments described above, such as... Figure 4 As shown, in this embodiment, the spring sheet 5 is bent outward at one end near the mounting piece 6 to form a connecting piece 8, and the spring sheet 5 is fixed to the mounting piece 6 through the connecting piece 8. Preferably, the mounting piece 6 has a plurality of connecting holes 9 arranged longitudinally from top to bottom, and the connecting piece 8 has mounting holes corresponding to the connecting holes 9.

[0045] The connecting plate is connected to the connecting holes on the mounting plate by bolts. By connecting the connecting plate to different connecting holes, the installation height of the spring plate can be adjusted, thereby adjusting the distance between the two spring plates, and thus adjusting the clamping force of the spring plate on the thermocouple to avoid excessive or insufficient clamping force.

[0046] Furthermore, the end of the spring sheet 5 furthest from the mounting plate 6 is bent outward to form an extension sheet 7. The two extension sheets are in an open state, which can prevent the thermocouple from being stuck by the spring sheet when it moves back and cannot be pulled out.

[0047] In this embodiment, the spring sheet 5 can be made of metal and coated with a protective layer. For example... Figure 5 As shown, the protective layer includes an insulating layer 10, an anti-oxidation layer 11, a heat insulation layer 12, and a wear-resistant layer 13. The insulating layer 10 significantly increases the overall insulation resistance of the spring sheet 5, thereby hindering current flow and ensuring overall insulation of the spring sheet 5. The anti-oxidation layer 11 isolates the spring sheet 5 from air and moisture, preventing oxidation and corrosion and extending its service life. The heat insulation layer 12 isolates heat transmission, reducing the impact of high-temperature environments on the spring sheet 5. The wear-resistant layer 13 increases the surface hardness of the spring sheet 5, making its surface smoother and reducing wear.

[0048] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited to this. To avoid repetition, repeated content in each embodiment has been omitted, but this should not be construed as meaning that the corresponding embodiment does not include features from other embodiments. Features that cooperate with each other in different embodiments can also be combined with each other. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A thermocouple fixing device for blast furnace tuyeres, comprising a housing (1), characterized in that, The inner wall of the outer shell (1) is connected to the refractory filling layer (3). The refractory filling layer (3) has a cavity. One end of the cavity is provided with a thermocouple hole (2). The cavity adjacent to the thermocouple hole (2) gradually increases from the inside to the outside to form a funnel mouth (4). An elastic clamping member is provided on the refractory filling layer near the opening of the thermocouple hole (2). The elastic clamping member includes spring plates (5) symmetrically arranged at the opening of the thermocouple hole (2). The spring plates (5) are connected to the refractory filling layer (3) through the mounting plate (6). The mounting plate (6) is fixedly connected to the refractory filling layer (3). The spacing between the spring plates (5) is smaller than the outer diameter of the thermocouple; The spring sheet (5) is coated with a protective layer, which includes an insulating layer (10) to improve the insulation resistance of the surface of the spring sheet (5); The protective layer includes an antioxidant layer (11) to isolate air and moisture; The protective layer includes a heat insulation layer (12) to prevent the spread of heat; The protective layer includes a wear-resistant layer (13) to reduce wear on the spring sheet (5).

2. The thermocouple fixing device for blast furnace tuyeres according to claim 1, characterized in that, The spring sheet (5) is bent outward at one end near the mounting piece (6) to form a connecting piece (8), and the spring sheet (5) is fixed to the mounting piece (6) through the connecting piece (8).

3. The thermocouple fixing device for blast furnace tuyeres according to claim 2, characterized in that, The mounting plate (6) has connection holes (9) at different heights, and the connecting plate (8) has mounting holes corresponding to the connection holes (9).

4. A thermocouple fixing device for blast furnace tuyeres according to any one of claims 1-3, characterized in that, The end of the spring sheet (5) away from the mounting piece (6) is bent outward to form an extension piece (7).

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