Temperature measuring device for blast furnace baking

Abstract

The utility model relates to a temperature measuring device for drying a blast furnace, which comprises a thermocouple and an induced air duct, a protective tube is arranged outside the thermocouple, two ends of the thermocouple extend out of the protective tube, the thermocouple and the protective tube are arranged inside the induced air duct, and two ends of the protective tube are hermetically connected with the thermocouple. A group of supporting assemblies supported on the inner wall of the air inducing guide pipe are arranged outside the protective pipe close to the two ends of the protective pipe respectively, each supporting assembly comprises a plurality of supporting pieces arranged around the protective pipe by a circle at intervals, the supporting pieces can adjust the supporting height, and the whole air inducing guide pipe extends into the blast furnace from an iron notch of the blast furnace until the end of the thermocouple is placed in the center of the furnace during furnace baking; the thermocouple can transmit the temperature to a PLC system in real time through a display meter for a control room to check and adjust the temperature in real time, the thermocouple can be protected from being damaged due to shaking during furnace baking, the temperature measuring precision is improved, the temperature measuring device can be repeatedly utilized, the mounting requirements of different blast furnaces are met, the quality and efficiency of furnace baking are effectively improved, and the service life of the blast furnace is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of thermal instrument detection, and particularly relates to a temperature measuring device for blast furnace drying. Background Art

[0002] In the whole life cycle of blast furnaces for iron and steel smelting, each blast furnace has to go through the processes of new construction, medium repair and major repair. After each new construction, medium repair or major repair, the refractories in the furnace need to be replaced. However, the water content in the newly constructed refractories is relatively high. If direct production is carried out, it will have an adverse impact on the life of the refractories and the life of the blast furnace. Therefore, after each new construction or major repair, the furnace needs to be dried to dry the moisture in the furnace. The furnace drying is divided into multi-stage heating and heat preservation processes according to the pre-set furnace drying curve. During the process, it is necessary to measure the temperature in the furnace to feedback and control the accuracy of the furnace drying curve. Compared with infrared thermometers, the thermocouple temperature measurement method has the advantages of a larger temperature measurement range and higher detection accuracy. In the prior art, when installing a thermocouple, the thermocouple is usually inserted into the furnace from the tuyere or the furnace top, and the following problems exist:

[0003] (1) The short length of the thermocouple extending into the furnace and being close to the furnace wall will lead to inaccurate temperature measurement. In order to improve the temperature measurement accuracy, if the thermocouple is extended to the end close to the center of the furnace, due to the rapid change of the pressure air flow in the furnace during the furnace drying process, the shaking and vibration frequency of the thermocouple will be increased, resulting in the thermocouple being extremely prone to shaking and damage. After damage, the temperature in the furnace cannot be detected, resulting in the inaccuracy of the furnace drying curve, and it is necessary to stop the furnace drying to replace the thermocouple, which not only affects the quality of the furnace drying but also affects the furnace drying time.

[0004] (2) Due to the high temperature of the furnace drying, the length of the thermocouple extending into the furnace is relatively long. When high-temperature gas enters the protective tube of the thermocouple or the protective tube is deformed under the action of heat and vibration force, the flexible thermocouple will be bent and deformed after the furnace drying, and cannot be reused, which affects the detection cost and increases the removal difficulty.

[0005] (3) Due to the differences in the diameters available for installing thermocouples in blast furnaces of different sizes, the fixed installation structure of the thermocouple is difficult to adapt to different installation requirements, and the unreliable installation of the thermocouple will increase the shaking risk, resulting in inaccurate temperature measurement or easy damage. Summary of the Utility Model

[0006] The utility model aims to solve at least one of the above technical problems to some extent. The utility model provides a temperature measuring device for blast furnace drying, which can protect the thermocouple from being damaged due to shaking, improve the temperature measurement accuracy, can be reused, meet the installation requirements of different blast furnaces, and thus effectively improve the quality and efficiency of the furnace drying and increase the life of the blast furnace.

[0007] The technical solution adopted by the utility model to solve its technical problems is as follows:

[0008] A temperature measuring device for blast furnace drying includes a thermocouple and an air guiding duct. A protection tube is provided outside the thermocouple, and both ends of the thermocouple extend out of the protection tube. The thermocouple and the protection tube are placed inside the air guiding duct. Both ends of the protection tube are hermetically connected to the thermocouple. A set of support components that support on the inner wall of the air guiding duct are respectively provided outside the protection tube near both ends of the protection tube. The support components include several support members arranged at intervals around the protection tube, and the support height of the support members can be adjusted.

[0009] In a preferred embodiment, locking nuts are welded at both ends of the protection tube.

[0010] In a preferred embodiment, the support member includes a thimble bracket, a thimble and an arc-shaped positioning piece. The thimble bracket is connected to the protection tube. The thimble and the thimble bracket can be adjusted relative to each other, and the end of the thimble abuts against the arc-shaped positioning piece, and the arc-shaped positioning piece can cooperate with the inner wall of the air guiding duct.

[0011] In a preferred embodiment, a mating thread is provided between the thimble and the thimble bracket.

[0012] In a preferred embodiment, a turning handle is provided on the thimble.

[0013] In a preferred embodiment, a blind hole for mating with the thimble is provided on the arc-shaped positioning piece.

[0014] In a preferred embodiment, the support member includes a spring. The spring is located outside the thimble between the thimble bracket and the arc-shaped positioning piece, and the thimble and the thimble bracket can slide and cooperate along the telescopic direction of the spring.

[0015] In a preferred embodiment, the thimble passes through the thimble bracket, and a limiting boss is provided on a section of the thimble away from the arc-shaped positioning piece.

[0016] In a preferred embodiment, the thermocouple is connected to a display meter, and the display meter is connected to a PLC system.

[0017] Compared with the prior art, the beneficial effects of the present utility model are at least as follows:

[0018] (1) During the drying of the blast furnace, the whole air guiding duct is inserted into the blast furnace from the tuyere of the blast furnace until the end of the thermocouple is placed at the center of the furnace. Since the support components play a stable supporting role for the protection tube of the thermocouple, and the intervals of the support members do not affect the hot air output, the hot air in the blast furnace can enter from the inlet of the air guiding duct, flow along the gap between the protection tube and the air guiding duct, and be discharged out of the furnace from the outlet of the air guiding duct. This can not only make the detection more accurate, and then transmit the temperature to the PLC system in real time through the display meter for the control room to view and adjust the temperature in real time, but also protect the thermocouple from being damaged due to shaking, with high stability, greatly improving the quality and efficiency of the drying of the blast furnace, and further improving the service life of the blast furnace.

[0019] (2) Since both ends of the protection tube are reliably supported by the support components and are not easily deformed, the thermocouple is protected inside the protection tube, and high-temperature gas is prevented from entering the protection tube during the oven drying process through sealed connection, effectively solving the problem of the thermocouple bending and deforming after the existing oven drying, and facilitating the recycling and reuse of the temperature measuring device.

[0020] (3) The support height of the support member is adjustable, which facilitates the detachable connection between the thermocouple and the protection tube relative to the air guiding duct, and meets the installation requirements of the internal protection tube with different inner diameters of the air guiding duct under different blast furnace sizes and models, facilitating the reuse of the thermocouple.

[0021] (4) The support member can be reliably supported in cooperation with the inner wall of the air guiding duct through the arc-shaped positioning plate, and the support height is adjusted by the cooperation of the thimble and the thimble bracket. The overall structure is simple, and the operation and transformation are relatively convenient. Description of the Drawings

[0022] The above and / or additional aspects and advantages of the present utility model will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, where:

[0023] Figure 1 is the application schematic diagram of Embodiment 1 of the present utility model ( Figure 1 the enlarged views at A and B are shown);

[0024] Figure 2 is the three-dimensional head and tail schematic diagram of Embodiment 1 of the present utility model;

[0025] Figure 3 is the front view of Embodiment 1 of the present utility model;

[0026] Figure 4 is Figure 3 the sectional view in the CC direction;

[0027] Figure 5 is Figure 3 the bottom view;

[0028] Figure 6 is the bottom view schematic diagram of Embodiment 2 of the present utility model;

[0029] Figure 7 is the bottom view schematic diagram of Embodiment 3 of the present utility model.

[0030] Reference numerals in the figures: thermocouple 1, air guiding duct 2, air guiding duct inlet 201, air guiding duct outlet 202, protection tube 3, support assembly 4, support member 41, thimble bracket 410, thimble 411, arc-shaped positioning piece 412, mating thread 413, turning handle 414, blind hole 415, spring 416, limiting boss 417; display meter 5, PLC system 6, blast furnace 7, taphole 8, lock nut 9, Figure 1 The unmarked arrows in the figure indicate the hot air flow direction. Detailed implementation manners

[0031] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present utility model, but should not be construed as limiting the present utility model.

[0032] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "length", "inner diameter", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model 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 limiting the present utility model. In the description of the present utility model, the meaning of "a plurality" and "several" is two or more, unless otherwise specifically and clearly defined. In the present utility model, unless otherwise clearly specified and limited, terms such as "installed", "connected", "connected", "fixed", etc. 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 a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0033] Embodiment 1:

[0034] As Figure 1 and Figure 2 shown, it is a preferred implementation manner of the temperature measuring device for blast furnace drying in the present utility model. The temperature measuring device for blast furnace drying includes a thermocouple 1 and an air guiding duct 2. A protection tube 3 is arranged outside the thermocouple 1. Both ends of the thermocouple 1 extend out of the protection tube 3. The thermocouple 1 and the protection tube 3 are placed inside the air guiding duct 2. Both ends of the protection tube 3 are hermetically connected to the thermocouple 1. A set of support assemblies 4 that support on the inner wall of the air guiding duct 2 are respectively arranged outside the protection tube 3 near both ends of the protection tube 3. The support assembly 4 includes several support members 41 arranged at intervals around the protection tube 3 for one week, and the support height of the support members 41 can be adjusted.

[0035] As Figure 1 and Figure 2 ​As shown in the figure, for example, the thermocouple 1 is selected as an armored flexible K-type thermocouple 1 with a diameter of φ6mm, and the length is selected as 15M according to the hearth radius of the blast furnace 7. The protective tube 3 is selected as a seamless steel pipe with an inner diameter of 10mm. The thermocouple 1 is fixed in the protective tube 3 through a sealed connection, and high-temperature gas is prevented from entering the protective tube 3 during furnace drying. The two ends of the protective tube 3 are supported in the air-introducing duct 2 by adjusting the installation height of the support member 41, and the protective tube 3 is supported by the support assembly 4. During furnace drying, the air-introducing duct 2 is integrally inserted into the furnace of the blast furnace 7 from the tuyere 8 of the blast furnace 7 until the end of the thermocouple 1 is placed at the furnace center. The protective tube 3 can be fixed to the blast furnace 7 through connection methods such as flanges.

[0036] Since the support assembly 4 plays a stable supporting role for the protective tube 3 of the thermocouple 1 and is composed of several support members 41 arranged at intervals around the protective tube 3, it will not block the air-introducing duct 2 and affect the outflow of hot air. During furnace drying, as Figure 1 shown by the flow arrow direction, the hot air in the blast furnace 7 can flow along the gap between the protective tube 3 and the air-introducing duct 2 from the air-introducing duct inlet 201 and be discharged out of the furnace from the air-introducing duct outlet 202. Since the slender thermocouple 1 is close to the furnace center, compared with being close to the furnace wall, it can quickly detect the temperature change in the furnace and improve the detection accuracy. Further, the thermocouple 1 can be connected to the display meter 5 through a compensating wire, and the display meter 5 can be connected to the PLC system 6 through a cable to transmit the temperature to the PLC system 6 in real time for the control room to view in real time. The temperature in the furnace can be adjusted according to the preset furnace drying curve by the PLC system 6 through the real-time detection of the thermocouple 1 to improve the quality of furnace drying.

[0037] During the furnace drying process, when the pressure and air flow in the furnace change, the thermocouple 1 can be reliably supported in the air-introducing duct 2 by the support assembly 4 to protect the thermocouple 1 from shaking and damage, greatly improving the quality and efficiency of furnace drying, directly increasing the service life of the blast furnace 7. At the same time, since the two ends of the protective tube 3 are supported by force and the thermocouple 1 is protected in the protective tube 3, it is not easy to bend and deform, effectively solving the problem of the thermocouple 1 bending and deforming after the existing furnace drying, facilitating the reuse of the temperature measuring device. The adjustable support height of the support member 41 also facilitates the detachable connection of the thermocouple 1 and the protective tube 3 relative to the air-introducing duct 2. When the size and model of the blast furnace 7 are different, the inner diameter of the air-introducing duct 2 will also be different, and the support assembly 4 can be adaptively installed to meet different installation requirements, thereby reducing the spare parts cost.

[0038] As Figure 3 and Figure 4 shown, further, locking nuts 9 are welded to both ends of the protective tube 3. The protective tube 3 and the thermocouple 1 can be installed in a limited position. After the locking nut 9 is threadedly connected to the protective tube 3 and then fixed by welding, better airtightness is achieved after locking to prevent high-temperature gas from entering the protective tube 3 and causing damage and deformation of the thermocouple 1.

[0039] As Figure 5 shown, further, the support member 41 includes a thimble bracket 410, a thimble 411 and an arc-shaped positioning piece 412. The thimble bracket 410 is connected to the protection tube 3. The thimble 411 is relatively adjustable with respect to the thimble bracket 410. The end of the thimble 411 abuts against the arc-shaped positioning piece 412. The arc-shaped positioning piece 412 can cooperate with the inner wall of the air guiding duct 2. A mating thread 413 is provided between the thimble 411 and the thimble bracket 410.

[0040] For example: There are four thimble brackets 410 which are L-shaped or U-shaped structures and are welded to the outside of the protection tube 3 at intervals around the protection tube 3. After the thermocouple 1 and the protection tube 3 are integrally placed inside the air guiding duct 2, since the arc-shaped positioning piece 412 cooperates with the inner wall of the air guiding duct 2, when the thimble 411 is manually turned from the inlet and outlet of the air guiding duct 2, the shape of the inner wall of the air guiding duct 2 can limit the rotation of the arc-shaped positioning piece 412. At the same time, due to the threaded fit between the thimble 411 and the thimble bracket 410, the position of the thimble 411 on the thimble bracket 410 can be further adjusted. The thimble 411 is tightened to firmly abut against the arc-shaped positioning piece 412, and the arc-shaped positioning piece 412 is pressed against the inner wall of the air guiding duct 2 to achieve support. The disassembly is the same. For example, after the oven drying is completed, as long as the thimbles 411 at both ends of the protection tube 3 are loosened, the protection tube 3 together with the thermocouple 1 can be pulled out and reused. The adjustable support height of the support member 41 is quickly realized, and the overall structure is simple, and the operation and transformation are relatively convenient; by replacing thimbles 411 of different lengths, it is also possible to adapt to the installation of the protection tube 3 in air guiding ducts 2 with different inner diameters, and the stability is higher.

[0041] Further, a turning handle 414 is provided on the thimble 411, which is more convenient for manual operation.

[0042] Further, a blind hole 415 for cooperating with the thimble 411 is provided on the arc-shaped positioning piece 412. Then, the arc-shaped positioning piece 412 and the thimble 411 can be of a split structure, which is more convenient for replacement. Using the blind hole 415 to cooperate with the thimble 411 is also convenient for the quick positioning and installation of the arc-shaped positioning piece 412.

[0043] Embodiment 2:

[0044] As Figure 6 shown, another preferred embodiment of the temperature measuring device for blast furnace oven drying according to the present invention is different from Embodiment 1 in that there are three thimble brackets 410 which are plate-shaped and are tangentially arranged with the protection tube 3. Then the structure is simpler, and the thimble 411 has a larger adjustment space. For example, it is more convenient to use when the inner diameter of the protection tube 3 is relatively small.

[0045] Embodiment 3:

[0046] As Figure 7As shown, another preferred embodiment of the temperature measuring device for a blast furnace of the utility model is shown. The difference between the embodiment 1 is that the support member 41 also includes a spring 416, and the spring 416 is located outside the ejector pin 411 between the ejector pin bracket 410 and the arc-shaped positioning piece 412. The ejector pin 411 and the ejector pin bracket 410 can slide and cooperate along the expansion and contraction direction of the spring 416. The spring 416 is squeezed to the arc-shaped positioning piece 412 and can be placed inside the induced draft duct 2. The protective tube 3 can be quickly pushed into the induced draft duct 2. Under the elastic force of the squeezing spring 416, the arc-shaped positioning plate can be automatically pressed and supported inside the induced draft duct 2. Similarly, when disassembling, the protective tube 3 can be pulled out as a whole, which has the advantage of convenient operation. For example, when the spring 416 is compressed to a large extent after the protective tube 3 is fixed, the wind pressure will no longer cause the spring 416 to be overly compressed and cause excessive shaking.

[0047] Furthermore, the ejector pin 411 passes through the ejector pin bracket 410, and a limiting boss 417 is provided at a section of the ejector pin 411 away from the arc-shaped positioning piece 412. During installation, the ejector pin 411 passes through the ejector pin bracket 410 and the spring 416 to resist the arc-shaped positioning piece 412, so that the relative sliding installation of the ejector pin 411 and the ejector pin bracket 410 is more convenient. The purpose of providing the limiting boss 417 is to limit the sliding stroke of the ejector pin 411 and prevent the ejector pin 411 from detaching from the ejector pin bracket 410.

[0048] The series of detailed descriptions listed above are only specific descriptions of feasible embodiments of the present invention. They are not intended to limit the protection scope of the present invention. All equivalent embodiments or changes that do not deviate from the technical spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A temperature measuring device for blast furnace, characterized in that: The invention comprises a thermocouple (1) and an air induced duct (2), wherein a protective tube (3) is arranged outside the thermocouple (1), and both ends of the thermocouple (1) extend out of the protective tube (3). The thermocouple (1) and the protective tube (3) are arranged inside the air induced duct (2), and both ends of the protective tube (3) are sealedly connected to the thermocouple (1). A group of support components (4) supported on the inner wall of the air induced duct (2) are arranged outside the protective tube (3) near both ends of the protective tube (3), and the support components (4) include a plurality of support members (41) arranged at intervals around the protective tube (3), and the support height of the support members (41) can be adjusted.

2. The temperature measuring device for blast furnace baking according to claim 1, characterized in that: Locking nuts (9) are welded at both ends of the protection tube (3).

3. The temperature measuring device for blast furnace baking according to claim 1, characterized in that: The support member (41) comprises an ejector bracket (410), an ejector (411) and an arc-shaped positioning piece (412); the ejector bracket (410) is connected to the protection tube (3); the ejector (411) and the ejector bracket (410) are relatively adjustable; the end of the ejector (411) abuts against the arc-shaped positioning piece (412); and the arc-shaped positioning piece (412) is capable of cooperating with the inner wall of the air duct (2).

4. The temperature measuring device for blast furnace baking according to claim 3, characterized in that: A matching thread (413) is provided between the ejector pin (411) and the ejector pin bracket (410).

5. The temperature measuring device for blast furnace baking according to claim 4, characterized in that: The ejector pin (411) is provided with a rotating handle (414).

6. The temperature measuring device for blast furnace baking according to claim 3, characterized in that: The arc-shaped positioning piece (412) is provided with a blind hole (415) that cooperates with the ejector pin (411).

7. The temperature measuring device for blast furnace baking according to claim 3, characterized in that: The support member (41) comprises a spring (416), wherein the spring (416) is located outside the ejector pin (411) between the ejector pin bracket (410) and the arc-shaped positioning piece (412), and the ejector pin (411) and the ejector pin bracket (410) can be slidably matched along the extension and contraction direction of the spring (416).

8. The temperature measuring device for blast furnace baking according to claim 7, characterized in that: The ejector pin (411) passes through the ejector pin bracket (410), and a portion of the ejector pin (411) away from the arc-shaped positioning piece (412) is provided with a limiting boss (417).

9. The temperature measuring device for blast furnace baking according to any one of claims 1 to 8, characterized in that: The thermocouple (1) is connected to a display meter (5), and the display meter (5) is connected to a PLC system (6).

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