Blast furnace hot blast stove high-temperature galvanic couple fixing structure and method

Abstract

The high-temperature thermocouple fixing structure comprises a hot-blast stove main pipe, a hot-blast stove pipe shell is arranged on the periphery of the hot-blast stove main pipe, an isolation space is arranged along the circumference of the hot-blast stove pipe shell in an outward protruding mode, and a mounting structure used for fixing a thermocouple is arranged inside / outside the isolation space. A first sleeve structure layer is arranged in the installation structure, a second sleeve structure layer is arranged in the vertical direction of the first sleeve structure layer in a splicing mode, the first sleeve structure layer and the second sleeve structure layer are coaxially arranged, thermocouples are arranged in the first sleeve structure layer and the second sleeve structure layer, and the thermocouples are arranged in the first sleeve structure layer and the second sleeve structure layer. The thermocouple extends into the hot-blast stove main pipe, the isolation spaces on the hot-blast stove main pipe are arranged at intervals, thermocouple temperature measuring points are arranged at the positions of the isolation spaces according to different depths, the isolation spaces are of hollow structures protruding out of the hot-blast stove main pipe, and installation structures are arranged in the isolation spaces in a fixed mode.

Description

Technical Field

[0001] The present invention belongs to the technical field of iron and steel metallurgy, and particularly relates to a high-temperature thermocouple fixing structure and method for a blast furnace hot blast stove. Background Art

[0002] Thermocouples are designed and installed on the hot blast stove body and hot air pipeline. The hot blast stove operators carry out process operations based on the temperature detection values of each part. When the high-temperature thermocouple of the hot blast stove body is damaged, the furnace operators have no basis for firing the stove, which easily causes damage to the refractory materials of the hot blast stove. For example, when the hot air temperature thermocouple is damaged, the hot air temperature of the blast furnace fluctuates, resulting in fluctuations in the smelting furnace condition of the blast furnace and affecting the smooth operation of the blast furnace. In the design of the hot blast stove system, electric coupling installation holes are reserved in the furnace masonry. To facilitate the installation and rapid replacement of the thermocouple, the current high-temperature thermocouples are all designed with integral flange connections. The thermocouples selected for the high-temperature area are of type B or S, with a platinum-rhodium thermocouple wire as the material, a measuring range of 0 - 1500 °C, and the price of a single unit is 10,000 - 50,000 yuan. The purchased service life of the thermocouple is greater than 1 year. In the actual production process, the thermocouples are replaced frequently. The reasons are analyzed as follows: (1) The quality of the thermocouple products is poor and the service life is short. (2) The refractory bricks expand and damage the ceramic protection sleeve of the thermocouple. (3) The replacement of the thermocouple causes damage to the ceramic protection sleeve of the thermocouple. Through the tracking investigation of thermocouple damage, it is found that the main reasons for thermocouple damage are the installation of the thermocouple and the expansion of the refractory bricks.

[0003] When replacing and installing the thermocouple, after the thermocouple is removed, the construction personnel clean the flange surface and then directly install the new thermocouple. Due to the different degrees of deformation of the short pipe and flange of the thermocouple installation hole under the influence of temperature and refractory brick expansion during the production process, the flange of the new thermocouple installation is horizontal, and the deformation of the short pipe flange is not serious, resulting in a slight inclination of the thermocouple pipe flange. The high-temperature expansion of the refractory bricks shears the thermocouple pipe, reducing the service life of the thermocouple. When the deformation of the short pipe flange is serious, the thermocouple pipe is inclined and crushed by the refractory bricks during the process of tightening the upper and lower flanges, resulting in direct damage to the thermocouple. During the process of tightening the flanges, the sealing gasket is likely to leak air, causing a burning-through accident.

[0004] In view of the above factors, a high-temperature thermocouple fixing structure and method for a blast furnace hot blast stove are provided to prevent damage to the thermocouple during the installation process and extend the service life of the thermocouple. Summary of the Invention

[0005] The purpose of the present invention is to provide a high-temperature thermocouple fixing structure and method for a blast furnace hot blast stove to solve the problems raised in the above background art.

[0006] The purpose of the present invention is achieved by the following technical solutions: A high-temperature thermocouple fixing structure for a blast furnace hot blast stove includes a main hot blast stove pipe, and a hot air pipe shell is arranged on the periphery of the main hot blast stove pipe. An isolation space protrudes outward along the circumference of the hot air pipe shell, and an installation structure for fixing the thermocouple is arranged inside / outside the isolation space;

[0007] A first sleeve structure layer is provided inside the installation structure. A second sleeve structure layer is arranged vertically in a splicing manner within the first sleeve structure layer. The first sleeve structure layer and the second sleeve structure layer are coaxially arranged. A thermocouple is provided along the inside of the first sleeve structure layer and the second sleeve structure layer, and the thermocouple extends into the main pipe of the hot blast stove. The isolation spaces on the main pipe of the hot blast stove are arranged at intervals, and thermocouple temperature measurement points are set at different depths at each isolation space position.

[0008] Further, the isolation space is a hollow structure protruding from the main pipe of the hot blast stove, and an installation structure is fixedly arranged in the isolation space;

[0009] The installation structure is a cavity sleeve structure that is shaped to fit the isolation space, and the installation structure is detachably connected to the support platforms on both sides of the isolation space;

[0010] A through hole coaxial with the first sleeve structure layer and the second sleeve structure layer is provided at the central position of the installation structure.

[0011] Further, the installation structure and the support platforms on both sides of the isolation space are detachably connected by bolt connection.

[0012] Further, the first sleeve structure layer provided inside the installation structure is an I-shaped sleeve structure, and a high-temperature heat-resistant layer is wrapped around the periphery of the first sleeve structure layer.

[0013] The bottom edge of the first sleeve structure layer contacts the end face of the isolation space;

[0014] A closed cover is detachably arranged on the end face of the isolation space, and the bottom edge of the first sleeve structure layer contacts the closed cover;

[0015] An installation channel through which the first sleeve structure layer passes is reserved at the central position of the closed cover.

[0016] Further, the first sleeve structure layer and the second sleeve structure layer are detachably connected. The second sleeve structure layer has the same structure as the first sleeve structure layer, and the height of the second sleeve structure layer is adjustable.

[0017] Further, the detachable connection between the first sleeve structure layer and the second sleeve structure layer is by bolt connection;

[0018] The first sleeve structure layer extends towards the outer circumference of the isolation space, and the extension distance towards the outer circumference of the isolation space is 20 - 30 mm.

[0019] Furthermore, a fixing tooling is arranged between the first sleeve structure layer and the main pipe of the hot blast stove. The bottom of the fixing tooling is connected with a connecting seat on the main pipe of the hot blast stove through a connecting rod;

[0020] The upper end of the connecting rod is connected with the fixing tooling. The fixing tooling is an open rectangular structure, and the opening distance of the fixing tooling is the same as the upper end thickness of the first sleeve structure layer;

[0021] The fixing tooling is in plug-in fit with the first sleeve structure layer.

[0022] Furthermore, a dovetail slideway is arranged at the bottom of the fixing tooling, and the dovetail slideway is matched with a dovetail slider arranged on the connecting rod.

[0023] A method for installing a thermocouple on a high-temperature thermocouple fixing structure of a blast furnace hot blast stove includes the following steps;

[0024] Connect the installation structure and the support platforms on both sides of the isolation space in a detachable manner, which is a bolt connection. The first sleeve structure layer arranged in the installation structure is an I-shaped sleeve structure, and the periphery of the first sleeve structure layer is wrapped with a high-temperature heat-resistant layer;

[0025] The end face of the isolation space is provided with a closing cover in a detachable manner. The bottom edge of the first sleeve structure layer contacts the closing cover and is fixed by bolts;

[0026] An installation channel through which the first sleeve structure layer passes is reserved at the center position of the closing cover;

[0027] A second sleeve structure layer is arranged in a splicing manner in the vertical direction of the first sleeve structure layer. Install the second sleeve structure layer coaxially with the first sleeve structure layer. Install a thermocouple in the first sleeve structure layer and the second sleeve structure layer. The flange end face on the thermocouple is connected with the flange end face on the second sleeve structure layer through bolts.

[0028] A high-temperature thermocouple fixing structure and method of a blast furnace hot blast stove are applied to the installation of a thermocouple in a blast furnace hot blast pipe to prevent damage to the thermocouple during the installation process and extend the service life of the thermocouple.

[0029] Compared with the prior art, the beneficial effects of the present invention:

[0030] In the present invention, the first sleeve structure layer and the second sleeve structure layer are coaxially arranged and are in detachable fit, so they can be disassembled and replaced. In the use state, the flange on the thermocouple contacts the flange on the second sleeve structure layer and is matched by bolts.

[0031] The height of the second sleeve structure layer can be adjusted. At the same time, the bottom diameter of the second sleeve structure layer 6 is smaller than the end face diameter of the first sleeve structure layer.

[0032] In the use state, according to different actual working conditions, the flange on the thermocouple contacts the flange on the first sleeve structure layer and is fitted with bolts.

[0033] The present invention can effectively prevent the deformation of the first sleeve structure layer from affecting the installation of the thermocouple by setting a fixing tooling. Brief Description of the Drawings

[0034] Figure 1 is a schematic diagram of the installation of the main pipe of the hot blast stove and the isolation space of the present invention;

[0035] Figure 2 is a schematic diagram of the installation of the first sleeve structure layer and the second sleeve structure layer of the present invention;

[0036] Figure 3 is a schematic diagram of the support platforms on both sides of the isolation space of the present invention;

[0037] Figure 4 is an enlarged schematic diagram of the fixing tooling on the main pipe of the hot blast stove of the present invention;

[0038] Figure 5 is an enlarged schematic diagram of the first sleeve structure layer and the isolation space of the present invention;

[0039] Figure 6 is an enlarged schematic diagram of the fixing tooling of the present invention;

[0040] Figure 7 is an enlarged schematic diagram of the installation of the first sleeve structure layer and the isolation space of the present invention;

[0041] Figure 8 is a schematic diagram of the structure with a thermocouple installation of the present invention. Detailed Embodiments

[0042] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0043] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0044] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present invention.

[0045] As Figure 1-8 shown, a high-temperature thermocouple fixing structure for a blast furnace hot blast stove includes a main hot blast stove pipe 1. A hot blast pipe casing 2 is arranged around the main hot blast stove pipe 1. An insulating space 3 is protruded outwards in a circular shape along the hot blast pipe casing 2. An installation structure 4 for fixing a thermocouple 4 is arranged inside / outside the insulating space 3;

[0046] The insulating space 3 is connected to the hot blast pipe casing in a fixed or detachable manner.

[0047] A first sleeve structure layer 5 is arranged inside the installation structure 4. A second sleeve structure layer 6 is arranged in a splicing manner in the vertical direction of the first sleeve structure layer 5. The first sleeve structure layer 5 and the second sleeve structure layer 6 are coaxially arranged. A thermocouple 4 is arranged inside the first sleeve structure layer 5 and the second sleeve structure layer 6. The thermocouple 4 extends into the main hot blast stove pipe 1. The insulating spaces 3 on the main hot blast stove pipe 1 are arranged at intervals, and thermocouple temperature measurement points are arranged at different depths at each position of the insulating space 3.

[0048] In order to facilitate reducing the influence of the main hot blast stove pipe 1 on the upper space of the thermocouple and the ceramic protection sleeve of the thermocouple by arranging the insulating space in the use state, the insulating space 3 is a hollow structure protruding from the main hot blast stove pipe 1, and an installation structure 4 is arranged in a fixed manner in the insulating space 3;

[0049] The installation structure 4 is a cavity sleeve structure arranged in imitation of the insulating space 3. The installation structure 4 is detachably connected to the support platforms 7 on both sides of the insulating space 3;

[0050] Adopting the above structure can support the installation structure 4 in the insulating space.

[0051] A through hole 8 coaxial with the first sleeve structure layer 5 and the second sleeve structure layer 6 is arranged at the central position of the installation structure 4.

[0052] Fixing holes are arranged at the bottom of the first sleeve structure layer 5. The fixing holes on the first sleeve structure layer 5 are inserted and matched with the positioning columns arranged on the support platform for limiting and positioning.

[0053] The lower end diameter of the first sleeve structure layer 5 is smaller than the upper end diameter, and the diameter of the bottom of the first sleeve structure layer 5 is smaller than the distance between the bolt holes on the support platform.

[0054] In order to facilitate detachable replacement in the use state, the installation structure 4 is detachably connected to the support platforms 7 on both sides of the isolation space 3 by a bolt connection.

[0055] When the above-mentioned detachable connection method is adopted, it is beneficial to replace and install the thermocouple. After the thermocouple is removed, the construction personnel clean the flange surface and then directly install the new thermocouple.

[0056] In order to facilitate the protection of the thermocouple through the first sleeve structure layer 5 in the use state, the first sleeve structure layer 5 provided in the installation structure 4 is an I-shaped sleeve structure, and the periphery of the first sleeve structure layer 5 is wrapped with a high-temperature heat-resistant layer 9.

[0057] The bottom edge of the first sleeve structure layer 5 contacts the end face of the isolation space 3;

[0058] The end face of the isolation space 3 is provided with a closed cover 10 in a detachable manner, and the bottom edge of the first sleeve structure layer 5 contacts the 10;

[0059] An installation channel through which the first sleeve structure layer 5 passes is reserved at the center position of the closed cover.

[0060] The above-mentioned fixation with the closed cover enables disassembly and replacement in the use state.

[0061] In order to facilitate setting the thermocouple temperature measurement points at different depths according to the position of each isolation space 3 in the use state, the first sleeve structure layer 5 and the second sleeve structure layer 6 are detachably connected. The second sleeve structure layer 6 has the same structure as the first sleeve structure layer 5, and the height of the second sleeve structure layer 6 is adjustable.

[0062] With the above structure, the height can be adjusted through the second sleeve structure layer 6 according to the different depths of the thermocouple inserted into the main pipe 1 of the hot blast stove.

[0063] In order to facilitate the fixation of the fixing tool to the outer circumferential extension part of the isolation space 3 through the first sleeve structure layer 5 in the use state, the detachable connection between the first sleeve structure layer 5 and the second sleeve structure layer 6 is a bolt connection;

[0064] The first sleeve structure layer 5 extends towards the outer circumference of the isolation space 3, and the extension distance towards the outer circumference of the isolation space 3 is 20 - 30 mm.

[0065] In order to facilitate the effective control of the long-term deformation of the first sleeve structure layer 5 adjacent to the hot blast stove main pipe 1 during use, a fixing tooling 11 is provided between the first sleeve structure layer 5 and the hot blast stove main pipe 1. The fixing tooling 11 includes a fixed end 12, and the bottom of the fixed end 12 is connected to a connecting seat 14 on the hot blast stove main pipe 1 through a connecting rod 13;

[0066] The upper end of the connecting rod 13 is connected to the fixing tooling 11. The fixing tooling 11 is an open rectangular structure, and the opening distance of the fixing tooling 11 is the same as the upper end thickness of the first sleeve structure layer 5;

[0067] The fixing tooling 11 and the first sleeve structure layer 5 are in plug-in fit.

[0068] The above structure setting can prevent different degrees of deformation caused by the influence of temperature and refractory brick expansion during production by isolating the space and the cooperation of the first sleeve structure layer 5.

[0069] In the use state, the flange on the thermocouple contacts the flange on the second sleeve structure layer 6 and is bolted.

[0070] The second sleeve structure layer 6 can adjust its height, and at the same time, the bottom diameter of the second sleeve structure layer 6 is smaller than the end face diameter of the first sleeve structure layer 5.

[0071] In the use state, according to different actual working conditions, the flange on the thermocouple contacts the flange on the first sleeve structure layer 5 and is bolted.

[0072] In order to facilitate the quick cooperation between the fixed end on the fixing tooling 11 and the dovetail slider on the connecting rod through the set sliding way in the use state, a dovetail slideway is provided at the bottom of the fixing tooling 11, and the dovetail slideway cooperates with the dovetail slider provided on the connecting rod. When the sliding is in place, it can be fixed by bolts on the outside.

[0073] The present invention fixes the thermocouple by setting the first sleeve structure layer 5 and the second sleeve structure layer 6 in combination with the isolation space 3, ensures that the channels of the first sleeve structure layer and the second sleeve structure layer are perpendicular to the channels of the pipeline refractory lining, installs a new thermocouple, and fastens it through bolts / flanges to ensure that the flange gasket is tightly sealed without air leakage.

[0074] A method for installing a thermocouple in a high-temperature thermocouple fixing structure of a blast furnace hot blast stove includes the following steps;

[0075] The installation structure is detachably connected to the support platforms on both sides of the isolation space by bolt connection. The first sleeve structure layer provided in the installation structure is an I-shaped sleeve structure, and the periphery of the first sleeve structure layer is wrapped with a high-temperature heat-resistant layer;

[0076] The end face of the isolation space is provided with a closed cover in a detachable manner. The bottom edge of the first sleeve structure layer contacts the closed cover and is fixed by bolts;

[0077] An installation channel through which the first sleeve structure layer passes is reserved at the center position of the closed cover;

[0078] A second sleeve structure layer is arranged in a splicing manner in the vertical direction of the first sleeve structure layer. The second sleeve structure layer is installed coaxially with the first sleeve structure layer. A thermocouple is installed in the first sleeve structure layer and the second sleeve structure layer. The flange end face of the thermocouple is connected to the flange end face of the second sleeve structure layer by bolts.

[0079] A high-temperature thermocouple fixing structure and method for a blast furnace hot blast stove are applied to the installation of a thermocouple in a blast furnace hot blast pipeline to prevent damage to the thermocouple during the installation process and extend the service life of the thermocouple.

[0080] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed claims.

[0081] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A high temperature couple fixing structure for a blast furnace hot blast stove, comprising a hot blast stove main pipe (1), characterized in that: A hot air pipe shell (2) is arranged on the periphery of the hot air furnace main pipe (1), an isolation space (3) is arranged protruding outwardly along the circumference of the hot air pipe shell (2), and a mounting structure (4) for fixing a thermocouple (4) is arranged inside / outside the isolation space (3); A first casing structure layer (5) is arranged in the installation structure (4), a second casing structure layer (6) is arranged in a splicing manner in a vertical direction of the first casing structure layer (5), the first casing structure layer (5) and the second casing structure layer (6) are arranged coaxially, thermocouples (4) are arranged along the first casing structure layer (5) and the second casing structure layer (6), the thermocouples (4) extend into the hot blast furnace main pipe (1), the insulating spaces (3) on the hot blast furnace main pipe (1) are arranged at intervals, and a thermocouple temperature measuring point is arranged at different depths at each position of the insulating space (3).

2. The high temperature electric couple fixing structure of the hot blast stove of blast furnace according to claim 1 is characterized in that: The isolation space (3) is a hollow structure protruding from the hot blast furnace main pipe (1), and the isolation space (3) is provided with a mounting structure (4) in a fixed manner; The mounting structure (4) is a cavity sleeve structure arranged in the same shape as the isolation space (3), and the mounting structure (4) is detachably connected to the support platforms (7) on both sides of the isolation space (3); A through hole (8) is provided at the center of the installation structure (4) and is coaxially arranged with the first sleeve structure layer (5) and the second sleeve structure layer (6).

3. The high temperature electric couple fixing structure of the hot blast stove of blast furnace according to claim 2 is characterized in that: The mounting structure (4) is detachably connected to the support platforms (7) on both sides of the isolation space (3) by bolts.

4. The high temperature couple fixing structure for hot blast stove of blast furnace according to claim 3 is characterized in that: The first sleeve structure layer (5) arranged in the installation structure (4) is an I-shaped sleeve structure, and the outer periphery of the first sleeve structure layer (5) is wrapped with a high-temperature heat-resistant layer (9). The bottom edge of the first sleeve structure layer (5) is in contact with the end surface of the isolation space (3); The end surface of the isolation space (3) is provided with a detachable closing cover (10), and the bottom edge of the first sleeve structure layer (5) is in contact with the (10); An installation channel through which the first sleeve structure layer (5) passes is reserved at the center of the closing cover.

5. The high temperature electric couple fixing structure of the hot blast stove of blast furnace according to claim 4, characterized in that: The first sleeve structure layer (5) is detachably connected to the second sleeve structure layer (6); the second sleeve structure layer (6) has the same structure as the first sleeve structure layer (5); and the height of the second sleeve structure layer (6) is adjustable.

6. The high temperature electric couple fixing structure of the hot blast stove of blast furnace according to claim 5, characterized in that: The detachable connection between the first casing structure layer (5) and the second casing structure layer (6) is a bolt connection; The first sleeve structure layer (5) extends toward the outer circumference of the insulating space (3), and extends toward the outer circumference of the insulating space (3) by a distance of 20-30 mm.

7. The high temperature electric couple fixing structure of the hot blast stove of blast furnace according to claim 6, characterized in that: A fixing fixture (11) is provided between the first sleeve structure layer (5) and the hot blast furnace main pipe (1), the fixing fixture (11) comprising a fixing end (12), the bottom of the fixing end (12) being connected to a connecting seat (14) on the hot blast furnace main pipe (1) via a connecting rod (13); The upper end of the connecting rod (13) is connected to the fixing fixture (11), and the fixing fixture (11) is an open rectangular structure, and the opening distance of the fixing fixture (11) is the same as the thickness of the upper end of the first sleeve structure layer (5); The fixing tool (11) and the first sleeve structure layer (5) are matched in a plug-in manner.

8. The high temperature electric couple fixing structure for hot blast stove of blast furnace according to claim 7, characterized in that: A dovetail slide is provided at the bottom of the fixing tool (11), and the dovetail slide cooperates with a dovetail slider provided on the connecting rod.

9. A method for installing a thermocouple according to the high temperature thermocouple fixing structure of a blast furnace hot blast stove according to any one of claims 1 to 8, characterized in that: The steps include: The mounting structure is detachably connected to the support platforms on both sides of the isolation space by bolts, the first casing structure layer provided in the mounting structure is an I-shaped casing structure, and the outer periphery of the first casing structure layer is wrapped with a high-temperature heat-resistant layer; The end surface of the isolation space is provided with a closing cover in a detachable manner, and the bottom edge of the first sleeve structure layer is in contact with the closing cover and fixed by bolts; An installation channel through which the first sleeve structure layer passes is reserved at the center of the closing cover; A second casing structure layer is arranged in a splicing manner in a vertical direction of the first casing structure layer. The second casing structure layer is installed and arranged coaxially with the first casing structure layer. Thermocouples are installed in the first casing structure layer and the second casing structure layer. The flange end face on the thermocouple is connected to the flange end face of the second casing structure layer by bolts.

10. A blast furnace hot blast stove high temperature thermocouple fixing structure and method according to any one of claims 1-8 or 9 is applied to the installation of thermocouples in blast furnace hot blast ducts to prevent damage to the thermocouples during the installation process and extend the service life of the thermocouples.

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