An on-line inspection device for a small bushing of a blast furnace

Abstract

This application discloses an online inspection device for blast furnace tuyeres, belonging to the technical field of blast furnace tuyere internal cavity inspection. It includes an insulating sleeve that can be inserted into the blast furnace through a direct-blowing pipe. The insulating sleeve comprises an inner tube and an outer tube, with the inner tube coaxially arranged inside the outer tube. An endoscope is installed inside the inner tube. In use, one end of the insulating sleeve is inserted into the direct-blowing pipe, and the endoscope is inserted into the blast furnace. By adjusting the insertion depth and angle of the insulating sleeve, the endoscope can clearly and comprehensively observe the internal cavity of the tuyeres. Furthermore, a refrigerant channel is formed between the outer circumferential surface of the inner tube and the inner circumferential surface of the outer tube. The refrigerant channel is closed at both ends, and an inlet pipe and an outlet pipe connected to the refrigerant channel are provided on the outer tube. The inlet and outlet pipes are connected to a heat exchange device to realize the circulation of refrigerant in the refrigerant channel. Through the refrigerant heat exchange, the internal temperature of the inner tube is maintained at a low level.

Description

Technical Field

[0001] This application relates to the field of blast furnace tuyere sleeve internal cavity inspection technology, and in particular to an online inspection device for blast furnace tuyere sleeves. Background Technology

[0002] The blast furnace's air supply system includes the tuyere direct-blowing pipe and the tuyere sleeve. The tuyere sleeve is located at the very end of the system, directly facing the high temperature inside the furnace. The inner cavity of the tuyere sleeve needs to pass through hot air exceeding 1200℃ and pulverized coal injected by the pulverized coal injection gun. During production, if the nozzle angle of the pulverized coal injection gun deviates, the injected pulverized coal will cause wear on the inner cavity of the tuyere sleeve, eventually leading to its damage. Therefore, it is necessary to regularly observe the inner cavity of the tuyere sleeve to detect wear and adjust the position of the pulverized coal injection gun accordingly.

[0003] In related technologies, operators observe the interior of the blast furnace through a peephole installed on the outside of the tuyeres' direct-blowing pipe. This peephole has a diameter of approximately 16mm, and the distance between it and the tuyeres' sleeve is about 3 meters. Therefore, it is difficult to observe the inner cavity of the tuyeres' sleeve through this peephole during operation. Furthermore, to maintain the activity of the blast furnace hearth, the tuyeres' sleeve is generally designed with a downward sloping shape, making it difficult to observe the bottom side of the inner cavity through the peephole. The wear and tear on the inner cavity of the tuyeres' sleeve caused by pulverized coal may not be detected in time, potentially leading to damage to the tuyeres' sleeve and resulting in blast furnace shutdowns, which is detrimental to long-term continuous blast furnace production. Summary of the Invention

[0004] The purpose of this application is to provide an online inspection device for blast furnace tuyere sleeves, which solves the problem in the prior art that it is difficult to observe the inner cavity of the tuyere sleeves, resulting in the inability to detect whether the tuyere sleeves are worn in a timely manner.

[0005] To solve the above-mentioned technical problems, this application adopts the following technical solution:

[0006] This application provides an online inspection device for blast furnace tuyeres sleeves, comprising:

[0007] A heat insulation sleeve is installed inside a direct-blowing pipe. The heat insulation sleeve includes an inner tube and an outer tube. The inner tube is coaxially arranged inside the outer tube. A refrigerant channel is formed between the outer circumferential surface of the inner tube and the inner circumferential surface of the outer tube. An inlet pipe and an outlet pipe connected to the refrigerant channel are provided on the outer tube. The inlet pipe and the outlet pipe are connected to a heat exchange device to realize the circulation of refrigerant in the refrigerant channel.

[0008] An endoscope, which is installed inside the inner tube, is used to observe the inner cavity of the air vent sleeve.

[0009] This design utilizes an insulated sleeve to provide installation space for the endoscope, which is positioned near the end of the sleeve. One end of the insulated sleeve is inserted into the direct-blowing pipe, guiding the endoscope into the blast furnace. By adjusting the insertion depth and angle of the insulated sleeve, the endoscope can clearly and comprehensively observe the interior of the tuyeres, transmitting the images to a display device via wired or wireless means. To prevent excessively high temperatures within the tuyeres, which could damage the endoscope, the insulated sleeve employs an inner and outer tube sleeve structure. A refrigerant channel is formed between the outer circumference of the inner tube and the inner circumference of the outer tube, with an inlet and outlet water pipe connected to this channel on the outer tube. The inlet and outlet water pipes are connected to a heat exchanger. The refrigerant in the heat exchanger enters the refrigerant channel through the inlet water pipe for heat exchange, then flows back into the heat exchanger through the outlet water pipe, achieving refrigerant circulation. Through refrigerant heat exchange, the interior of the inner tube maintains a low temperature, thus meeting the operating conditions of the endoscope.

[0010] Optionally, the inlet pipe and the outlet pipe are connected to the outer pipe on the side outside the blast furnace. The refrigerant channel has a first closed end located outside the blast furnace and a second closed end located inside the blast furnace. Two baffles are provided between the inner pipe and the outer pipe. The two baffles are connected to the first closed end, and there is a flow channel between the two baffles and the second closed end. The two baffles divide the refrigerant channel into an inlet channel and a return channel. The inlet pipe is connected to the inlet channel, and the outlet pipe is connected to the return channel.

[0011] This design incorporates two baffles between the inner and outer pipes, dividing the refrigerant channel into an inlet channel and a return channel. The inlet pipe connects to the inlet channel, and the outlet pipe connects to the return channel. The refrigerant enters the inlet channel through the inlet pipe, flows along the inlet channel to the overflow channel, then enters the return channel, and finally flows along the return channel into the outlet pipe, thus achieving heat exchange. By incorporating baffles, the refrigerant flow path is optimized, achieving efficient heat exchange and ensuring that the end of the insulation jacket closest to the blast furnace maintains a lower internal temperature.

[0012] Optionally, the inner tube has an extension protruding from the end of the outer tube on the side away from the air vent sleeve. A display connector is provided at the port of the extension. The display connector is electrically connected to the endoscope via a transmission line and is used to connect a display device.

[0013] In this design, the endoscope is connected to the display device via a wired connection. The endoscope's transmission line is connected to the display connector located at the port of the extension section. The extension section is located outside the blast furnace, thus providing the necessary connection for the display device.

[0014] Optionally, the display connector blocks the port of the extension section, and a high-pressure pipe is connected to the extension section for connecting a high-pressure fan.

[0015] This design incorporates a high-pressure pipe connected to the extension section, which in turn connects to a high-pressure blower. The blower forces high-pressure air into the inner pipe, which is then injected into the blast furnace, thereby reducing radiant heat within the inner pipe. Furthermore, through refrigerant heat exchange, the air temperature inside the inner pipe, further away from the blast furnace interior, is lower. High-pressure air can then be blown to the end of the insulation sleeve, further reducing the internal temperature of the inner pipe.

[0016] Optionally, it also includes a valve connecting pipe, which is sleeved on the direct blow valve. A clamping nut is fitted on the valve connecting pipe. The clamping nut has a clamping part and a sealing part. The clamping part is sleeved on the valve connecting pipe, and the sealing part protrudes from the end of the valve connecting pipe. A sealing gasket is sandwiched between the inner circumferential surface of the sealing part and the outer circumferential surface of the outer pipe.

[0017] Optional. The sealing gasket is made of thermal insulation cotton.

[0018] When the direct-fired pipe valve is opened, high-temperature gas inside the blast furnace will overflow between the direct-fired pipe and the insulation sleeve. Under high-temperature conditions, it is difficult for operators to adjust the insulation sleeve and observe the internal cavity of the blast furnace's small sleeve. This design installs a valve connecting pipe on the direct-fired pipe valve, with a clamping nut fitted onto it to secure it. The clamping nut has a clamping part and a sealing part. The clamping part is fitted onto the valve connecting pipe, while the sealing part protrudes from the end of the valve connecting pipe. The insulation sleeve passes through the sealing part into the direct-fired pipe. A sealing gasket, made of insulation cotton, is sandwiched between the inner circumference of the sealing part and the outer circumference of the outer pipe. The insulation cotton seals the gap between the direct-fired pipe and the insulation sleeve, thus preventing the overflow of high-temperature gas from the blast furnace. Furthermore, the insulation cotton is deformable, providing conditions for adjusting the angle of the insulation sleeve. This design provides operators with the means to adjust the insulation sleeve and observe the internal cavity of the blast furnace's small sleeve.

[0019] Compared with the prior art, the beneficial effects achieved by this application are as follows: This application provides an installation space for the endoscope through a heat-insulating sleeve, with the endoscope positioned near the port of the heat-insulating sleeve. One end of the heat-insulating sleeve is inserted into the direct-blowing pipe, allowing the endoscope to be delivered into the blast furnace. By adjusting the insertion depth and angle of the heat-insulating sleeve, the endoscope can clearly and comprehensively observe the internal cavity of the tuyeres. Furthermore, to prevent excessively high temperatures within the tuyeres, which could damage the endoscope, the heat-insulating sleeve in this application employs an inner and outer tube sleeve structure. A refrigerant channel is formed between the outer circumferential surface of the inner tube and the inner circumferential surface of the outer tube, and an inlet and outlet water pipe connected to the refrigerant channel are connected to the outer tube. The inlet and outlet water pipes are connected to the heat exchange device. The refrigerant in the heat exchange device enters the refrigerant channel through the inlet water pipe for heat exchange, and then flows back into the heat exchange device through the outlet water pipe, thus achieving refrigerant circulation. The refrigerant heat exchange ensures that the inside of the inner tube maintains a low temperature, thus creating a low-temperature working environment for the endoscope.

[0020] This application allows for a clear and comprehensive observation of the inner cavity of the tuyere sleeve, preventing the tuyere sleeve from being damaged by coal dust without timely detection, which could lead to a shutdown or production stoppage. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the overall structure of some embodiments provided in this application;

[0023] Figure 2 These are schematic diagrams of refrigerant flow in some embodiments provided in this application;

[0024] Figure 3 These are cross-sectional views of the heat insulation sleeves of some embodiments provided in this application;

[0025] Figure 4 This is a schematic diagram of the direct-blowing pipe valve connection of some embodiments provided in this application.

[0026] Explanation of reference numerals in the attached drawings: 1-Insulation sleeve; 2-Endoscope; 3-Inlet pipe; 4-Outlet pipe; 5-High pressure pipe; 6-Valve connection pipe; 7-Pressure nut; 8-Sealing gasket; 9-Direct blow valve; 11-Inner pipe; 12-Outer pipe; 13-Baffle; 14-Monitor connector; 15-Fixing bracket; 31-Inlet valve; 41-Return valve; 71-Pressure part; 72-Sealing part. Detailed Implementation

[0027] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure / application, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this application or its application or use.

[0028] Example 1

[0029] This embodiment describes an online inspection device for a blast furnace tuyere sleeve, referencing... Figure 1 The online inspection device for the blast furnace tuyeres in this embodiment includes a heat insulation sleeve 1, which can be inserted into the blast furnace through a direct-blowing pipe. The heat insulation sleeve 1 includes an inner tube 11 and an outer tube 12, with the inner tube 11 coaxially disposed inside the outer tube 12. A fixed bracket 15 is provided near the port of the inner tube 11, and an endoscope 2 is mounted on the fixed bracket 15. By inserting one end of the heat insulation sleeve 1 located on the fixed bracket 15 into the direct-blowing pipe, the endoscope 2 can be delivered into the blast furnace. By adjusting the insertion depth and angle of the heat insulation sleeve 1, the endoscope 2 can clearly and comprehensively observe the internal cavity of the tuyeres, and the observed images can be transmitted to a display device via wired or wireless means.

[0030] Furthermore, to prevent excessively high internal temperature of the vent sleeve, which could damage the endoscope 2, the insulation sleeve 1 in this example employs an inner tube 11 and an outer tube 12 sleeved together. A refrigerant channel is formed between the outer circumferential surface of the inner tube 11 and the inner circumferential surface of the outer tube 12. An inlet pipe 3 and an outlet pipe 4, connected to the refrigerant channel, are connected to the outer tube 12. The inlet pipe 3 and the outlet pipe 4 are connected to a heat exchange device. The heat exchange device can be a cold water tank, which pumps cooling water to the inlet pipe 3. After heat exchange through the refrigerant channel, the water flows back into the cold water tank through the outlet pipe 4, achieving circulation. Furthermore, an inlet valve 31 is installed on the inlet pipe 3, and a return valve 41 is installed on the outlet pipe 4. When observation of the vent sleeve's internal cavity is complete, the inlet valve 31 and the return valve 41 can be closed before removing the device to prevent cooling water leakage.

[0031] When observing the inner cavity of the tuyeres, the insulation sleeve 1 needs to extend into the blast furnace. To avoid the influence of the blast furnace temperature and to facilitate the movement of the insulation sleeve 1, in this embodiment, the inlet pipe 3 and the outlet pipe 4 are both located on the outside of the blast furnace, connected to the outer pipe 12. Furthermore, to ensure sufficient circulation of the refrigerant within the refrigerant channel, the end of the insulation sleeve 1 closest to the blast furnace must maintain a lower temperature. (Reference) Figure 2 and Figure 3In this embodiment, the refrigerant channel has a first closed end located outside the blast furnace and a second closed end located inside the blast furnace. Two baffles 13 are provided between the inner pipe 11 and the outer pipe 12. The two baffles 13 are connected to the first closed end, and there is a flow passage between the two baffles 13 and the second closed end. The two baffles 13 divide the refrigerant channel into an inlet channel and a return channel. The water inlet pipe 3 is connected to the inlet channel, and the water outlet pipe 4 is connected to the return channel. By providing two baffles 13 between the inner pipe 11 and the outer pipe 12, the refrigerant channel is divided into an inlet channel and a return channel. The refrigerant enters the inlet channel through the water inlet pipe 3, flows along the inlet channel to the flow passage, and then enters the return channel. It then flows along the return channel into the water outlet pipe 4, thus achieving heat exchange. By setting the baffles 13, the flow path of the refrigerant is optimized, achieving efficient heat exchange of the refrigerant and ensuring that the interior of the insulation sleeve 1 near the blast furnace can maintain a lower temperature.

[0032] Example 2

[0033] Based on the same inventive concept as Embodiment 1, refer to Figure 1 In this embodiment, the endoscope 2 is connected to the display device via a wired connection. Specifically, the inner tube 11 has an extension protruding from the end of the outer tube 12 on the side away from the air vent sleeve. A display connector 14 is provided at the port of the extension, and the display connector 14 is electrically connected to the endoscope 2 via a transmission line. The display connector 14 is used to connect to the display device.

[0034] In this embodiment, the display connector 14 blocks the port of the extension section, and a high-pressure pipe 5 is connected to the extension section. The high-pressure pipe 5 is used to connect to a high-pressure blower. High-pressure air is blown into the inner tube 11 by the high-pressure blower and then injected into the blast furnace, thereby reducing the radiant heat inside the inner tube 11. In addition, through refrigerant heat exchange, the air temperature inside the inner tube 11, which is far from the blast furnace, is lower. High-pressure air can blow the low-temperature air to the end of the heat insulation sleeve 1, thereby further reducing the temperature inside the inner tube 11.

[0035] Example 3

[0036] Based on the same inventive concept as Embodiment 1. (See reference...) Figure 4 After the direct-blowing pipe valve 9 is opened, the high-temperature gas in the blast furnace will overflow from between the direct-blowing pipe and the insulation sleeve 1. Under high-temperature conditions, it is not conducive to the staff to adjust the insulation sleeve 1 and observe the internal cavity of the blast furnace small sleeve.

[0037] To address the aforementioned issues, in this embodiment, a valve connecting sleeve is fitted onto the direct-blowing pipe valve 9, and a clamping nut 7 is fitted onto the valve connecting pipe 6. The clamping nut 7 has a clamping part 71 and a sealing part 72. The clamping part 71 is fitted onto the valve connecting pipe 6. The sealing part 72 protrudes from the end of the valve connecting pipe 6, and a sealing gasket 8 is sandwiched between the inner circumferential surface of the sealing part 72 and the outer circumferential surface of the outer pipe 12. The sealing gasket 8 is made of heat-insulating cotton. The heat-insulating cotton can seal the gap between the direct-blowing pipe and the heat-insulating sleeve 1, thereby preventing the escape of high-temperature gas from the blast furnace. In addition, the heat-insulating cotton has deformability, providing conditions for adjusting the angle of the heat-insulating sleeve 1. The above design provides conditions for operators to adjust the heat-insulating sleeve 1 and observe the internal cavity of the blast furnace sleeve.

[0038] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this disclosure / application, and these improvements and modifications should also be considered within the protection scope of this disclosure / application.

Claims

1. An online inspection device for blast furnace tuyere sleeves, characterized in that, include: A heat insulation sleeve (1) is installed inside a direct-blowing pipe. The heat insulation sleeve (1) includes an inner tube (11) and an outer tube (12). The inner tube (11) is coaxially arranged inside the outer tube (12). A refrigerant channel is formed between the outer circumferential surface of the inner tube (11) and the inner circumferential surface of the outer tube (12). The refrigerant channel is closed at both ends. An inlet pipe (3) and an outlet pipe (4) connected to the refrigerant channel are provided on the outer tube (12). The inlet pipe (3) and the outlet pipe (4) are connected to a heat exchange device to realize the circulation of refrigerant in the refrigerant channel. Endoscope (2), which is set inside the inner tube (11) for observing the inner cavity of the air vent sleeve.

2. The online inspection device for blast furnace tuyeres according to claim 1, characterized in that, The inlet pipe (3) and the outlet pipe (4) are connected to the outer pipe (12) on one side outside the blast furnace. The refrigerant channel has a first closed end located outside the blast furnace and a second closed end located inside the blast furnace. Two partitions (13) are provided between the inner pipe (11) and the outer pipe (12). The two partitions (13) are connected to the first closed end. There is a flow channel between the two partitions (13) and the second closed end. The two partitions (13) divide the refrigerant channel into an inlet channel and a return channel. The inlet pipe (3) is connected to the inlet channel, and the outlet pipe (4) is connected to the return channel.

3. The online inspection device for blast furnace tuyeres according to claim 1, characterized in that, The inner tube (11) has an extension section protruding from the end of the outer tube (12) on the side away from the air vent sleeve. A display connector (14) is provided at the port of the extension section. The display connector (14) is electrically connected to the endoscope (2) through a transmission line. The display connector (14) is used to connect a display device.

4. The online inspection device for blast furnace tuyeres according to claim 3, characterized in that, The display connector (14) blocks the port of the extension section, and a high-pressure pipe (5) is connected to the extension section. The high-pressure pipe (5) is used to connect to a high-pressure fan.

5. The online inspection device for blast furnace tuyeres according to claim 1, characterized in that, It also includes a valve connecting pipe (6), which is sleeved on the direct blow valve (9). A clamping nut (7) is sleeved on the valve connecting pipe (6). The clamping nut (7) has a clamping part (71) and a sealing part (72). The clamping part (71) is sleeved on the valve connecting pipe (6). The sealing part (72) protrudes from the end of the valve connecting pipe (6). A sealing gasket (8) is sandwiched between the inner circumferential surface of the sealing part (72) and the outer circumferential surface of the outer pipe (12).

6. The online inspection device for blast furnace tuyeres according to claim 5, characterized in that, The sealing gasket (8) is heat insulation cotton.

7. The online inspection device for blast furnace tuyeres according to claim 1, characterized in that, A fixed bracket (15) is provided inside the inner tube (11), and the endoscope (2) is fixedly connected to the fixed bracket (15).

8. The online inspection device for blast furnace tuyeres according to claim 1, characterized in that, The inlet pipe (3) is equipped with an inlet valve (31), and the outlet pipe (4) is equipped with a return valve (41).

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