Hot air conveying pipeline structure applied to fluidized bed vibration working condition

Abstract

The utility model relates to a fluidized bed equipment technical field, specifically, relate to a hot -blast delivery pipeline structure for fluidized bed vibration working condition. The structure includes the inner layer pipeline for conveying hot -blast, the first outer layer pipeline is fixedly connected with the inner layer pipeline outside, the inner layer pipeline outside still is provided with the second outer layer pipeline in the first outer layer pipeline side near fluidized bed, and can be connected with the fluidized bed, the flexible connecting pipe is connected between the first outer layer pipeline and the second outer layer pipeline, the first outer layer pipeline is linked with cold -blast source, and the clearance between the inner layer pipeline and the first outer layer pipeline, the second outer layer pipeline is used for conveying cold -blast. The advantages of the technical scheme in the application are: keeping the structural stability in the temperature range of -40 DEG C-600 DEG C, bearing the continuous vibration of amplitude ±10mm, frequency 30 times / minute, realizing at least 50000 times bending cycle without structural failure, reducing fluid resistance loss less than or equal to 8%.

Description

Technical Field

[0001] This utility model relates to the technical field of fluidized bed equipment, specifically to a hot air conveying pipeline structure applied to fluidized bed vibration conditions. Background Technology

[0002] In fluidized bed equipment used in industries such as chemical engineering, environmental protection, and energy, the high-temperature hot air conveying system is a key component. Existing fluidized bed systems, such as the one disclosed in Chinese patent CN204217769U, include a fluidized bed hot air system for grain drying. The system includes a fluidized bed hot blast furnace, a cyclone separator, a shell-and-tube heat exchanger, an induced draft fan, a hot air blower, and a dryer. The upper part of the fluidized bed hot blast furnace is connected to the upper part of the cyclone separator through a flue gas passage. The clean flue gas outlet of the cyclone separator is connected to the tube-side inlet of the shell-and-tube heat exchanger. The tube-side outlet of the shell-and-tube heat exchanger is connected to the induced draft fan. The shell-side inlet of the shell-and-tube heat exchanger is open to the outside air, and the shell-side outlet is connected to the air inlet of the dryer via the hot air blower. The furnace wall and furnace cover of the fluidized bed hot blast furnace are made of steel plates lined with insulation material and refractory cement. The shell of the cyclone separator is made of steel plates lined with wear-resistant and high-temperature resistant material. The air cap on the air distribution plate of the fluidized bed hot blast furnace is bell-shaped and has air holes around its perimeter. Alternatively, as disclosed in Chinese Patent CN208296453U, a fluidized bed heating device includes an air inlet pipe, a fan, a heater, a hot air pipe, a scraper device, a sieve plate, and a fluidized bed connected in sequence. A sieve plate is also provided between the hot air pipe and the fluidized bed, and a scraper device is also provided between the sieve plate and the hot air pipe. The scraper device includes a housing, with a fan chamber at the top of the housing cavity and a collection chamber at the bottom. A fan shaft support is installed in the middle of the housing, and a fan shaft is longitudinally arranged in the middle of the fan shaft support. A scraper fan and a compression spring are sequentially sleeved on the fan shaft from top to bottom. The upper part of each blade of the scraper fan is a scraper part, and the lower part of each blade of the scraper fan is a fan part. The hot air pipe is connected to the collection chamber, and an openable sealed door is also provided below the collection chamber.

[0003] Because fluidized beds experience continuous vibration during operation, the connections between the conveying pipelines and equipment need to have a certain degree of flexibility to compensate for vibration displacement. Currently, commonly used flexible pipe connections are mainly divided into two categories: 1. Silicon carbide + glass fiber, metal corrugated pipe: These can withstand temperatures above 900℃, but have poor flexibility, are prone to fatigue cracks with frequent bending, and typically have a service life of less than 2 days; 2. Canvas, silicone, and PVC: These have good bending performance, but their temperature resistance is limited to only 280℃, making them prone to aging and cracking in high-temperature hot air environments.

[0004] The aforementioned existing technologies all suffer from the drawback of having only one type of performance, and cannot simultaneously meet the dual requirements of high temperature resistance (≥500℃) and frequent bending resistance (≥10,000 cycles) in the fluidized bed vibration environment. This results in short equipment maintenance cycles (average 1-3 days), low production efficiency, and high operation and maintenance costs. Utility Model Content

[0005] The purpose of this invention is to provide a hot air conveying pipeline structure applicable to fluidized bed vibration conditions, addressing the above-mentioned problems. The outer pipeline has a low surface temperature, can be connected to the fluidized bed using a flexible connection, and has a long equipment maintenance cycle, which is beneficial to improving production efficiency and reducing operation and maintenance costs.

[0006] To achieve the above objectives, this utility model discloses a hot air conveying pipeline structure for use in fluidized bed vibration conditions. The structure includes an inner layer pipeline for conveying hot air, a first outer layer pipeline fixedly connected to the outside of the inner layer pipeline, and a second outer layer pipeline located on the side of the first outer layer pipeline closer to the fluidized bed and capable of connecting to the fluidized bed. A flexible connecting pipe connects the first and second outer layer pipelines. The first outer layer pipeline is connected to a cold air source, and the gaps between the inner layer pipeline and the first and second outer layer pipelines are used for conveying cold air. In use, the second outer layer pipeline is installed on the fluidized bed, the inner layer pipeline is connected to the hot air source, and the first outer layer pipeline is connected to the cold air source. The fluidized bed vibration frequency is [frequency] times / minute, the amplitude is ±10mm, the hot air temperature is 580±10℃, the hot air pressure is ≤2000Pa, and the flow rate is 15000m³. 3 / h, cold air pressure ≥3000Pa, flexible connecting pipe surface temperature 85℃. Performance test results show that the technical solution in this application has been running continuously for 6 months, accumulating 438 hours without failure, with an actual fluid resistance loss of 6.3%. Due to the adoption of the technical solution in this application, the outer pipe surface temperature is <100℃, ordinary canvas flexible connection can be used, the equipment maintenance cycle is long, which is conducive to improving production efficiency and reducing operation and maintenance costs. At the same time, it realizes the synergistic operation of high-temperature airflow output and frequent bending of workpieces. The advantages of the technical solution in this application are: maintaining structural stability in the temperature range of -40℃ to 600℃, withstanding continuous vibration with an amplitude of ±10mm and a frequency of 30 times / minute, achieving at least 50,000 bending cycles without structural failure, and reducing fluid resistance loss by ≤8%.

[0007] Preferably, the flexible connecting pipe has sleeves at both ends, one sleeve being fitted onto the first outer pipe and the other sleeve being fitted onto the second outer pipe. The sleeves are connected to the first and second outer pipes by fixing clamps, or the sleeves are bonded to the first and second outer pipes. In use, the sleeves are fixed to the first and second outer pipes by fixing clamps. This structure facilitates disassembly and reduces replacement time to ≤ minutes, which helps improve production efficiency and reduce maintenance costs.

[0008] Preferably, each fixing clamp includes several arc-shaped clamp bodies, with clamp ear plates connected to the ends of the clamp bodies. Adjacent clamp ear plates are connected by a bolt and nut structure. Fixing clamps including several arc-shaped clamp bodies are easy to install, especially for first and second outer layer pipes with larger diameters.

[0009] Preferably, the hoop body is semi-circular in shape, and each fixing clamp includes two hoop bodies. Fixing clamps with two hoop bodies are convenient to install.

[0010] Preferably, the outer side of the first outer pipe near the flexible connecting pipe has a first positioning protrusion, and a fixing clamp is located on the side of the first positioning protrusion away from the flexible connecting pipe; the outer side of the second outer pipe near the flexible connecting pipe has a second positioning protrusion, and another fixing clamp is located on the side of the second positioning protrusion away from the flexible connecting pipe. In use, the fixing clamp cooperates with the first positioning protrusion and the second positioning protrusion, which is beneficial for fixing the sleeve on the first positioning protrusion and the second positioning protrusion.

[0011] Preferably, one end of the sleeve has a first positioning groove that mates with a first positioning protrusion, and the other end of the sleeve has a second positioning groove that mates with a second positioning protrusion. In use, the first positioning groove mates with the first positioning protrusion, and the second positioning groove mates with the second positioning protrusion, which facilitates the positioning and installation of both ends of the sleeve and improves installation accuracy.

[0012] Preferably, the first positioning protrusion is annular and arranged circumferentially along the first outer layer pipe, and the second positioning protrusion is annular and arranged circumferentially along the second outer layer pipe. In use, the annular first positioning protrusion and the annular second positioning protrusion are continuous in shape, which improves the fit while cooperating with the fixing clamp to fix both ends of the sleeve pipe.

[0013] Preferably, the flexible connecting pipe is made of canvas; a mounting flange is connected to one end of the second outer pipe near the second outer pipe. The fluidized bed only needs to be equipped with a flange that matches this structural specification for installation.

[0014] Preferably, the first outer pipe and the inner pipe are connected by an annular end plate with an end plate notch. A cold air intake box is connected to the outside of the inner pipe, and the cold air intake box has an intake box notch that communicates with the end plate notch. The cold air intake box is connected to a cold air intake pipe. In use, the cold air intake pipe is connected to a cold air source, and the cold air enters the first outer pipe sequentially through the cold air intake pipe and the intake box notch. This structure is convenient for processing and manufacturing.

[0015] Preferably, a plurality of cold air guide vanes are connected to the inner wall of the first outer duct or the outer wall of the inner duct, with the distance between two adjacent cold air guide vanes being 80-120mm. In use, the cold air guide vanes reduce the airflow disturbance coefficient to 0.12, reducing system energy consumption by approximately 12%.

[0016] In summary, the beneficial effects of this utility model are as follows: Due to the adoption of the technical solution in the application, the surface temperature of the outer pipe is <100℃, allowing for the use of ordinary canvas flexible connections. This results in a longer equipment maintenance cycle, which is beneficial for improving production efficiency and reducing operation and maintenance costs. Simultaneously, it achieves synergistic performance between high-temperature airflow output and the performance of frequently bent workpieces. It maintains structural stability within a temperature range of -40℃ to 600℃, withstands continuous vibration with an amplitude of ±10mm and a frequency of 30 times / minute, and achieves at least 50,000 bending cycles without structural failure, reducing fluid resistance loss by ≤8%. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a hot air conveying pipeline structure applied to fluidized bed vibration conditions according to this utility model; Figure 2 yes Figure 1 A magnified structural diagram of part A in the middle; Figure 3 This is a schematic diagram of the internal structure of a hot air conveying pipeline structure applied to the vibration condition of a fluidized bed according to this utility model; Figure 4 yes Figure 3 A magnified structural diagram of part B in the middle; Figure 5 This is a structural schematic diagram of the hot air conveying pipeline structure in the decomposed state of the present invention, which is applied to the vibration condition of a fluidized bed. Figure 6 This is a three-dimensional structural diagram of a hot air conveying pipeline applied to the vibration condition of a fluidized bed, according to this utility model. Figure 7 This is a three-dimensional structural schematic diagram of a hot air conveying pipeline applied to fluidized bed vibration conditions, from another perspective.

[0018] In the diagram: 1. Inner layer pipe; 2. First outer layer pipe; 3. Second outer layer pipe; 4. Mounting flange; 5. Cold air intake box; 6. Cold air intake pipe; 7. Flexible connecting pipe; 8. Socket pipe; 9. Fixing clamp; 10. Clamp ear plate; 11. Cold air guide plate; 12. Annular end plate; 13. End plate notch; 14. First positioning protrusion; 15. Second positioning protrusion; 16. First positioning groove; 17. Second positioning groove; 18. Intake box notch. Detailed Implementation

[0019] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0020] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0021] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0022] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0023] like Figures 1 to 4As shown, a hot air conveying pipeline structure for use in fluidized bed vibration conditions includes an inner layer pipe 1 for conveying hot air. A first outer layer pipe 2 is fixedly connected to the outside of the inner layer pipe 1. A second outer layer pipe 3 is also provided on the outside of the inner layer pipe 1, located on the side of the first outer layer pipe 2 closest to the fluidized bed and capable of connecting to the fluidized bed. A mounting flange 4 is connected to one end of the second outer layer pipe 3 closest to the first outer layer pipe 2. The fluidized bed only needs to provide a flange that matches the specifications of this structure for installation. Specifically, the inner layer pipe 1 is made of 304 stainless steel with a thickness of 5mm, and its specification is DN500 with a total length of 800mm. The first outer layer pipe 2 and the second outer layer pipe 3 are made of ordinary carbon steel with a thickness of 5mm, such as Q235. A flexible connecting pipe 7 connects the first outer layer pipe 2 and the second outer layer pipe 3. Specifically, the flexible connecting pipe 7 is made of canvas, allowing frequent misalignment within 15mm between the first outer layer pipe 2 and the second outer layer pipe 3. The flexible connecting pipe 7 is 150mm long. The first outer pipe 2 is connected to the cold air source, and the gap between the inner pipe 1 and the first outer pipe 2 and the second outer pipe 3 is used to transport cold air.

[0024] In use, the second outer pipe 3 is installed on the fluidized bed, the inner pipe 1 is connected to the hot air source, and the first outer pipe 2 is connected to the cold air source. The fluidized bed vibration frequency is 30 times / minute, the amplitude is ±10mm, the hot air temperature is 580±10℃, the hot air pressure is ≤2000Pa, and the flow rate is 15000m³. 3 / h, cold air pressure ≥3000Pa, flexible connecting pipe 7 surface temperature 85℃. Performance test results show that the technical solution in this application has been running continuously for 6 months, accumulating 4380 hours without failure, with an actual fluid resistance loss of 6.3%. Due to the adoption of the technical solution in this application, the surface temperature of the outer pipe is <100℃, and ordinary canvas flexible connection can be used. The equipment maintenance cycle is long, which is conducive to improving production efficiency and reducing operation and maintenance costs. At the same time, it realizes the synergistic operation of high-temperature airflow output and frequent bending of workpieces. The advantages of the technical solution in this application are: maintaining structural stability in the temperature range of -40℃ to 600℃, withstanding continuous vibration with an amplitude of ±10mm and a frequency of 30 times / minute, achieving at least 50,000 bending cycles without structural failure, and reducing fluid resistance loss by ≤8%.

[0025] like Figure 5As shown, the flexible connecting pipe 7 has sleeves 8 at both ends. One sleeve 8 is fitted onto the first outer pipe 2, and the other sleeve 8 is fitted onto the second outer pipe 3. Specifically, the sleeves 8 are made of canvas, and both sleeves 8 are integrated with the flexible connecting pipe 7. The sleeves 8 are connected to the first outer pipe 2 and the second outer pipe 3 by fixing clamps 9. Alternatively, the sleeves 8 can be bonded to the first outer pipe 2 and the second outer pipe 3. In use, the sleeves 8 are fixed to the first outer pipe 2 and the second outer pipe 3 by fixing clamps 9. This structure facilitates disassembly and reduces replacement time to ≤30 minutes, which helps improve production efficiency and reduce maintenance costs.

[0026] like Figures 1 to 7 As shown, each fixing clamp 9 includes several arc-shaped clamp bodies, with clamp ear plates 10 connected to the ends of the clamp bodies. Adjacent clamp ear plates 10 are connected by a bolt and nut structure. The fixing clamp 9, including several arc-shaped clamp bodies, facilitates installation, especially for the first outer layer pipe 2 and the second outer layer pipe 3 with larger diameters. Preferably, the clamp body is semi-circular in shape, and each fixing clamp 9 includes two clamp bodies. The fixing clamp 9, including two clamp bodies, facilitates installation.

[0027] Specifically, the first outer pipe 2 has a first positioning protrusion 14 on the outer side of its end near the flexible connecting pipe 7, and a fixing clamp 9 is located on the side of the first positioning protrusion 14 away from the flexible connecting pipe 7; the second outer pipe 3 has a second positioning protrusion 15 on the outer side of its end near the flexible connecting pipe 7, and another fixing clamp 9 is located on the side of the second positioning protrusion 15 away from the flexible connecting pipe 7. In use, the fixing clamp 9 cooperates with the first positioning protrusion 14 and the second positioning protrusion 15, which facilitates the fixing of the sleeve 8 on the first positioning protrusion 14 and the second positioning protrusion 15. One sleeve 8 has a first positioning groove 16 on its inner side that can cooperate with the first positioning protrusion 14, and another sleeve 8 has a second positioning groove 17 on its inner side that can cooperate with the second positioning protrusion 15. In use, the first positioning groove 16 cooperates with the first positioning protrusion 14, and the second positioning groove 17 cooperates with the second positioning protrusion 15, which facilitates the positioning and installation of both ends of the sleeve 8 and improves installation accuracy. The first positioning protrusion 14 is annular and arranged around the first outer pipe 2, and the second positioning protrusion 15 is annular and arranged around the second outer pipe 3. In use, the annular first positioning protrusion 14 and the annular second positioning protrusion 15 are continuous in shape, which improves the fit while cooperating with the fixing clamp 9 to fix both ends of the sleeve pipe 8.

[0028] Specifically, the first outer pipe 2 and the inner pipe 1 are connected by an annular end plate 12, which has an end plate notch 13. A cold air intake box 5 is connected to the outside of the inner pipe 1. The cold air intake box 5 has an intake box notch 18 that communicates with the end plate notch 13. The cold air intake box 5 is connected to a cold air intake pipe 6. In use, the cold air intake pipe 6 is connected to a cold air source, and the cold air enters the first outer pipe 2 through the cold air intake pipe 6 and the intake box notch 18 in sequence. This structure is convenient for processing and manufacturing. Several cold air guide plates 11 are connected to the inner wall of the outermost duct 2 or the outer wall of the innermost duct 1. The cold air guide plates 11 are perpendicular to the sidewall of the innermost duct 1 and inclined to the axial direction of the innermost duct 1. The angle between the cold air guide plate 11 and the axial direction of the innermost duct 1 is 30-60°, specifically 30°, 45°, or 60°. The distance between two adjacent cold air guide plates 11 is 80-120mm, specifically 80mm, 100mm, or 120mm. Specifically, depending on the installation location, the cold air guide plates 11 are made of 5mm thick 304 stainless steel, or 5mm thick ordinary carbon steel, such as Q235. In use, the cold air guide plates 11 reduce the airflow disturbance coefficient to 0.12, reducing system energy consumption by approximately 12%.

[0029] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A hot air conveying pipeline structure for use in fluidized bed vibration conditions, comprising an inner pipeline (1) for conveying hot air, characterized in that, The inner pipe (1) is fixedly connected to the outer side of the first outer pipe (2). The inner pipe (1) is also provided with a second outer pipe (3) located on the side of the first outer pipe (2) close to the fluidized bed and capable of being connected to the fluidized bed. A flexible connecting pipe (7) is connected between the first outer pipe (2) and the second outer pipe (3). The first outer pipe (2) is connected to the cold air source. The gap between the inner pipe (1) and the first outer pipe (2) and the second outer pipe (3) is used to transport cold air.

2. The hot air conveying pipeline structure for use in fluidized bed vibration conditions as described in claim 1, characterized in that, The flexible connecting pipe (7) has sleeves (8) at both ends. One sleeve (8) is fitted onto the first outer pipe (2), and the other sleeve (8) is fitted onto the second outer pipe (3). The sleeve (8) is connected to the first outer pipe (2) and the second outer pipe (3) by a fixing clamp (9), or the sleeve (8) is bonded to the first outer pipe (2) and the second outer pipe (3).

3. The hot air conveying pipeline structure for use in fluidized bed vibration conditions as described in claim 2, characterized in that, Each fixing clamp (9) includes several arc-shaped clamp bodies, and the ends of the clamp bodies are connected to clamp ear plates (10). Adjacent clamp ear plates (10) are connected by a bolt and nut structure.

4. The hot air conveying pipeline structure for fluidized bed vibration conditions as described in claim 3, characterized in that, The hoop is semi-circular in shape, and each fixing clamp (9) consists of two hoops.

5. The hot air conveying pipeline structure for use in fluidized bed vibration conditions as described in claim 2, characterized in that, The first outer pipe (2) has a first positioning protrusion (14) on the outer side of one end near the flexible connecting pipe (7), and a fixing clamp (9) is located on the side of the first positioning protrusion (14) away from the flexible connecting pipe (7); the second outer pipe (3) has a second positioning protrusion (15) on the outer side of one end near the flexible connecting pipe (7), and another fixing clamp (9) is located on the side of the second positioning protrusion (15) away from the flexible connecting pipe (7).

6. The hot air conveying pipeline structure for fluidized bed vibration conditions as described in claim 5, characterized in that, One sleeve (8) has a first positioning groove (16) on its inner side that can cooperate with the first positioning protrusion (14), and another sleeve (8) has a second positioning groove (17) on its inner side that can cooperate with the second positioning protrusion (15).

7. The hot air conveying pipeline structure for use in fluidized bed vibration conditions as described in claim 5, characterized in that, The first positioning protrusion (14) is annular and is arranged around the first outer pipe (2), and the second positioning protrusion (15) is annular and is arranged around the second outer pipe (3).

8. The hot air conveying pipeline structure for use in fluidized bed vibration conditions as described in claim 1, characterized in that, The flexible connecting pipe (7) is made of canvas; the second outer pipe (3) has an installation flange (4) connected to one end near the second outer pipe (3).

9. The hot air conveying pipeline structure for fluidized bed vibration conditions as described in any one of claims 1 to 8, characterized in that, The outermost pipe (2) and the innermost pipe (1) are connected by an annular end plate (12). An end plate notch (13) is provided on the annular end plate (12). A cold air intake box (5) is connected to the outside of the innermost pipe (1). The cold air intake box (5) has an intake box notch (18) that communicates with the end plate notch (13). The cold air intake box (5) is connected to a cold air intake pipe (6).

10. The hot air conveying pipeline structure for fluidized bed vibration conditions as described in any one of claims 1 to 8, characterized in that, Several cold air guide plates (11) are connected to the inner wall of the first outer pipe (2) or the outer wall of the inner pipe (1), and the distance between two adjacent cold air guide plates (11) is 80-120mm.

Images