Blast furnace air supply branch pipe

Abstract

The utility model discloses a blast furnace air supply branch pipe, and relates to the technical field of blast furnace air supply pipes. The blast furnace air supply branch pipe comprises a compensator, a middle section and a lower section, and the middle section is communicated with the lower section through the compensator. The compensator comprises a pull rod type compensator and a hinge type compensator, the middle section and the lower section are each of a cylindrical structure with an upper taper pipe and a lower straight pipe, the upper end of the middle section is connected with the pull rod type compensator, and the lower end of the middle section is connected with the hinge type compensator; or the middle section and the lower section are both of a straight tubular structure, the upper end of the middle section is connected with the hinge type compensator, and the lower end of the middle section is connected with the pull rod type compensator; the outer side walls of the middle section and the lower section are of vertical corrugated cylinder structures, and refractory materials are bonded on the inner sides of the middle section and the lower section. Radial and axial adjustment enables the air supply branch pipe to be more convenient to disassemble and assemble in the production, use and maintenance processes. Compared with an original traditional smooth cylinder, the vertical corrugated structure has the advantages that the contact area between an internal refractory material and air is increased, and the heat dissipation effect of the middle section and the lower section is better.

Description

Technical Field

[0001] This utility model relates to the field of blast furnace air supply pipe technology, and in particular to a blast furnace air supply branch pipe. Background Technology

[0002] Currently, the adjustment range of domestic blast furnace blasting devices is relatively small, unable to adapt to the deformation caused by the aging of blast furnaces and fixed hot blast pipelines. This results in difficult installation of the blasting devices, poor sealing during hot blast delivery, hot blast leakage, and waste of thermal energy. Announcement No. CN206768158U discloses an energy-saving and environmentally friendly labyrinth-type blasting device, where the middle and lower sections are connected by tie-rod compensators. The radial adjustment range of the structure is very small, increasing the difficulty of disassembly and assembly during equipment maintenance and limiting its applicability.

[0003] Furthermore, the blast furnace air supply branch pipes are prone to surface overheating during long-term use. Therefore, the air supply branch pipes have certain requirements for heat dissipation capacity during use. Excessive temperature can burn through the pipes, severely shortening their lifespan and even causing the pipe walls to thin, leading to large fluctuations in furnace conditions and posing production safety hazards. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a blast furnace air supply branch pipe, which adopts two different types of compensators to ensure the structural connection strength and adapt to different structures and installation conditions at different angles.

[0005] To achieve this technical objective, the present invention adopts the following solution: a blast furnace air supply branch pipe, comprising a compensator, a middle section, and a lower section, wherein the middle section is connected to the lower section via the compensator; the compensator includes a tie-rod type compensator and a hinge type compensator, both the middle and lower sections are cylindrical structures with an upper conical tube and a lower straight tube, the upper end of the middle section is connected to the tie-rod type compensator, and the lower end of the middle section is connected to the hinge type compensator; or both the middle and lower sections are straight cylindrical structures, the upper end of the middle section is connected to the hinge type compensator, and the lower end of the middle section is connected to the tie-rod type compensator; the outer walls of both the middle and lower sections are vertical corrugated cylinder structures, and the inner sides are bonded with refractory material.

[0006] Compared with existing technologies, the advantages of this invention are as follows: A tie-rod type compensator is used to adjust the axial direction of the air supply branch pipe, and a hinge type compensator is used to increase the radial adjustment range. Adjustment in both directions makes disassembly and assembly of the air supply branch pipe more convenient during production, use, and maintenance. Compared with the traditional smooth cylinder, the vertical corrugated structure increases the contact area between the internal refractory material and air, resulting in better heat dissipation in the middle and lower sections.

[0007] The preferred embodiment of this utility model is as follows:

[0008] The middle and lower sections are each equipped with temperature sensors to monitor the temperature of the middle and lower sections in real time. When the temperature exceeds the set upper limit, nitrogen gas is used to blow on the outer wall of the middle or lower section to cool down the high-temperature area.

[0009] A gas cooling layer is fixed to the outer side of the middle and lower sections. This layer has a gas inlet and a gas outlet. The gas inlet is connected to an external gas source, and the gas outlet is connected to an external waste gas recovery structure. The gas cooling layer collects gas on the outside of the middle or lower section for rapid cooling. During cooling, gas is continuously input and output through the gas outlet, ensuring a constant supply of fresh gas for better cooling performance.

[0010] A gas source ring pipe is built into the center of the gas cooling layer, and vent holes are formed circumferentially on the inner wall of the gas source ring pipe. The angle and position of the vent holes vary. The circumferential arrangement of vent holes in the gas cooling layer allows gas to enter the gas cooling layer from multiple angles, accelerating the gas diffusion rate and quickly filling the gas cooling layer for cooling operations. Attached Figure Description

[0011] Figure 1 A structural diagram of the blast furnace air supply branch pipe according to the first embodiment of this utility model;

[0012] Figure 2 A structural diagram of the blast furnace air supply branch pipe according to the second embodiment of this utility model;

[0013] Figure 3 for Figure 1 Cross-sectional view of surface AA;

[0014] Figure 4 A schematic diagram of the blast furnace air supply branch pipe with a gas cooling layer provided by this utility model;

[0015] Figure 5 for Figure 4 Cross-sectional view of the middle BB section;

[0016] The following are marked in the diagram: 1. Middle section; 2. Lower section; 3. Tie rod type compensator; 4. Hinge type compensator; 5. Temperature sensor; 6. Vertical corrugated cylinder; 7. Gas cooling layer; 8. Gas source loop pipe; 9. Nozzle; 10. Gas inlet; 11. Gas outlet. Detailed Implementation

[0017] To fully understand the purpose, features and effects of this utility model, the following specific embodiments will be used to describe this utility model in detail, but this utility model is not limited thereto.

[0018] This utility model provides a blast furnace air supply branch pipe, including a middle section 1, a lower section 2, and an compensator. The compensator is divided into a tie-rod type compensator 3 (corrugated compensator) and a hinged type compensator 4 (Cartan type compensator). Flanges for connecting the compensators are fixed to the upper and lower ends of the middle section 1 and the lower section 2, respectively. The upper end of the middle section 1 is connected to the gooseneck pipe through the compensator, and the lower end of the middle section 1 is connected to the upper end of the lower section 2 through the compensator, forming an air supply branch pipe structure. To expand the applicable installation angle range, when both the middle section 1 and the lower section 2 are cylindrical structures with an upper tapered pipe and a lower straight pipe, the upper compensator uses a tie-rod type compensator 3, and the lower compensator uses a hinged type compensator 4. Figure 1 As shown. When both middle section 1 and lower section 2 are straight pipe structures, the upper compensator uses a hinged compensator 4, and the lower compensator uses a tie rod compensator 3, as shown. Figure 2 As shown.

[0019] During prolonged use, blast furnace blast branch pipes are prone to surface overheating. Therefore, surface temperature monitoring is necessary during operation. Excessive temperature can burn through the pipe, severely shortening its lifespan and posing safety hazards. To improve heat dissipation, the original smooth cylindrical outer shell of the middle or lower section is replaced with a vertical corrugated cylinder structure. Figure 3 As shown, the interior is still made of refractory material. Compared to the original smooth cylinder, the vertical corrugated cylinder has a larger surface area in contact with air, meaning a larger heat dissipation area. Therefore, the cooling effect of the air supply branch pipe itself is improved, and it is less likely to exceed the upper temperature limit. The middle and lower sections are straight pipes or have an upper conical pipe and a lower straight pipe structure, and their outer walls are all changed to vertical corrugated cylinders. The schematic diagram of the vertical corrugated cylinder of the straight pipe is omitted.

[0020] Furthermore, to more accurately monitor the temperature of the air supply branch pipes, temperature sensors 5 are installed at the upper and lower ends of the middle section 1 and the lower section 2, respectively, and are connected to the main control system. The temperatures of the middle section 1 and the lower section 2 are monitored in real time via the temperature sensors 5. When the temperature exceeds the set upper limit, nitrogen is used to cool the high-temperature area. If the middle or lower section is long, several more temperature sensors 5 can be added in the middle section according to actual usage.

[0021] Furthermore, a gas cooling layer 7 is fixed to the outer side of the outer wall of the middle and lower sections. The gas cooling layer 7 is provided with a gas inlet 10 and a gas outlet 11. A straight tube is used as an example for illustration. Figure 4As shown, the gas inlet 10 is equipped with a solenoid valve and connected to an external gas source, while the gas outlet 11 is connected to an external waste gas recovery device. If the temperature of the middle section 1 or the lower section 2 becomes too high, nitrogen is supplied to the gas cooling layer 7. The gas cooling layer collects the nitrogen and rapidly cools the middle section 1 or the lower section 2. During cooling, gas is continuously input, and gas outlet 11 continuously outputs gas, ensuring a continuous injection of fresh gas for better cooling. The discharged gas can be used for heat recovery operations such as low-temperature preheating of raw materials. Under normal circumstances, gas outlet 11 is in a normally open state.

[0022] In a more preferred embodiment, a gas source ring pipe 8 is built into the middle of the gas cooling layer 7, and the gas source ring pipe 8 is connected to a gas source. Exhaust holes are circumferentially formed on the inner wall of the gas source ring pipe 8. The angle and position of the exhaust holes vary, and fan-shaped nozzles 9 can also be installed at the exhaust holes, such as... Figure 5 As shown, by increasing the gas area, nitrogen gas is introduced into the gas source ring pipe 8 and diffuses to the gas cooling layer 7 from different positions and in different directions, which accelerates the gas filling and diffusion speed, allowing the gas to quickly fill the gas cooling layer for cooling operations.

[0023] Finally, it should be noted that the above-listed embodiments are merely preferred embodiments of the present invention. Of course, those skilled in the art can make modifications and variations to the present invention. If such modifications and variations fall within the scope of the claims of the present invention and their equivalents, they should be considered as being within the protection scope of the present invention.

Claims

1. A blast furnace air supply branch pipe comprising a compensator, an intermediate section and a lower section, the intermediate section being in communication with the lower section through the compensator; characterized in that, The compensator comprises a pull rod type compensator and a hinge type compensator, the middle section and the lower section are both in a cylindrical structure of upper conical tube and lower straight tube, the upper end of the middle section is connected with the pull rod type compensator, and the lower end of the middle section is connected with the hinge type compensator. The middle section and the lower section are both in a straight cylindrical structure, the upper end of the middle section is connected with the hinge type compensator, and the lower end of the middle section is connected with the pull rod type compensator; the outer side walls of the middle section and the lower section are both in a vertical corrugated tube structure, and the inner sides are bonded with refractory materials.

2. The blast furnace air supply branch of claim 1, wherein, The middle section and the lower section are respectively provided with temperature sensors.

3. The blast furnace air supply branch of claim 2, wherein, The outer sides of the outer side walls of the middle section and the lower section are fixed with gas cooling layers, the gas cooling layers are provided with gas input ports and gas exhaust ports, the gas input ports are connected with gas sources, and the gas exhaust ports are connected with external waste gas recovery structures.

4. The blast furnace air supply branch of claim 3, wherein, The middle part of the gas cooling layer is internally provided with a gas source ring tube, and the inner wall of the gas source ring tube is circumferentially provided with exhaust holes.

5. The blast furnace tuyere of claim 4, wherein, The angles and positions of the exhaust holes are different.

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