Fluidized bed fuel preheating system

Abstract

The application provides a fluidized bed feeding fuel preheating system, which comprises a mixer, a rotating shaft connected with a motor in the inner cavity of the mixer, a stirring frame arranged on the rotating shaft, a sliding sleeve arranged on the rotating shaft, and blades arranged on the sliding sleeve and clamped with the stirring frame, wherein the sliding sleeve can reciprocate along the axial direction of the rotating shaft while following the rotation of the stirring frame. In the application, the blades are arranged between the rotating shaft and the stirring frame and can reciprocate along the axial direction of the rotating shaft while rotating around the axis of the rotating shaft, so that the stirring direction is no longer single, and the mixing efficiency is improved by the simplified structure design.

Description

Technical Field

[0001] This application relates to the field of fluidized bed boiler technology, and in particular to a fluidized bed fuel preheating system. Background Technology

[0002] The mixer is an important component of the preheating system of a fluidized bed boiler, used to mix high-temperature hot slag and coal. Existing mixers have a single stirring direction, which results in a slow mixing process and low working efficiency.

[0003] Patent CN213746712U discloses an auxiliary system for preheating fuel in a circulating fluidized bed boiler. Compared with traditional mixers, it rotates horizontally while rotating vertically, so the stirring direction is no longer singular. This accelerates the mixing process between high-temperature hot slag and coal and improves the mixing efficiency.

[0004] However, the aforementioned mixer has a complex structure, making it inconvenient to disassemble and repair. Utility Model Content

[0005] In view of this, the purpose of this application is to provide a fluidized bed fuel preheating system for improving mixing efficiency with a simplified structural design.

[0006] The technical solution of this application is as follows:

[0007] This application provides a fluidized bed fuel preheating system, including a mixer. The inner cavity of the mixer is provided with a rotating shaft that is connected to a motor drive. A stirring frame is provided on the rotating shaft. A sliding sleeve is fitted on the rotating shaft. The sliding sleeve is provided with blades that engage with the stirring frame. The sliding sleeve can reciprocate along the axial direction of the rotating shaft while following the rotation of the stirring frame.

[0008] The technical solution of this application is adopted in which the blade is set between the rotating shaft and the stirring frame, and can move back and forth along the axis of the rotating shaft while rotating around the axis of the rotating shaft. The stirring direction is no longer unidirectional, and the mixing efficiency is improved with a simplified structural design.

[0009] In some implementations, a fixed shaft is fixedly connected to the inner cavity and passes through the interior of the rotating shaft.

[0010] In some implementations, the outer diameter of the fixed shaft is equal to the inner diameter of the rotating shaft.

[0011] In some implementations, the fixed shaft is provided with guide grooves that are inclined in the circumferential direction.

[0012] In some implementations, the rotating shaft is provided with a groove arranged axially.

[0013] In some implementations, the sliding sleeve is provided with a pin that passes through the sliding groove and engages with the guide groove.

[0014] In some implementations, the pins are arranged radially along the sleeve.

[0015] In some implementations, the blades are arranged radially along the sleeve.

[0016] In some implementations, the outer end of the blade is provided with a groove that slides and engages with the stirring frame.

[0017] In some implementations, the stirring frames are evenly distributed circumferentially along the axis of rotation. Attached Figure Description

[0018] Exemplary embodiments of this application will now be described in detail with reference to the accompanying drawings. It should be understood that the embodiments described below are for illustrative purposes only and are not intended to limit the scope of this application. In the accompanying drawings:

[0019] Figure 1 This is a schematic diagram of a fluidized bed fuel preheating system according to an embodiment of this application;

[0020] Figure 2 This is a cross-sectional view of a fluidized bed fuel preheating system according to an embodiment of this application;

[0021] Figure label:

[0022] 10. Mixer; 11. Inner cavity;

[0023] 20. Rotating shaft; 21. Motor; 22. Stirring frame; 23. Sliding sleeve; 24. Blade; 25. Pin; 26. Slide groove; 27. Slot;

[0024] 30. Fixed shaft; 31. Guide groove. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description of this application is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining this application and are not intended to limit this application.

[0026] In related technologies, the mixer is an important component of the preheating system of a fluidized bed boiler, used to mix high-temperature hot slag and coal. Existing mixers have a single stirring direction, which results in a relatively slow mixing process and low working efficiency.

[0027] Patent CN213746712U discloses an auxiliary system for preheating fuel in a circulating fluidized bed boiler. Compared with traditional mixers, it rotates horizontally while rotating vertically, so the stirring direction is no longer singular. This accelerates the mixing process between high-temperature hot slag and coal and improves the mixing efficiency.

[0028] However, the aforementioned mixer has a complex structure, making it inconvenient to disassemble and repair.

[0029] In view of this, the purpose of this embodiment is to provide a fluidized bed fuel preheating system for improving mixing efficiency with a simplified structural design.

[0030] Please see Figures 1-2 In this embodiment, a fluidized bed fuel preheating system includes a mixer 10. The inner cavity 11 of the mixer 10 is provided with a rotating shaft 20 that is connected to a motor 21. A stirring frame 22 is provided on the rotating shaft 20. A sliding sleeve 23 is sleeved on the rotating shaft 20. A blade 24 is provided on the sliding sleeve 23 that engages with the stirring frame 22. The sliding sleeve 23 can reciprocate along the axial direction of the rotating shaft 20 while rotating with the stirring frame 22.

[0031] In this embodiment, the blade 24 is positioned between the rotating shaft 20 and the stirring frame 22, and can reciprocate along the axial direction of the rotating shaft 20 while rotating around the axis of the rotating shaft 20. The stirring direction is no longer singular, and the simplified structural design improves the mixing efficiency.

[0032] In this embodiment, a fixed shaft 30 is fixedly connected in the inner cavity 11 of the mixer 10. The fixed shaft 30 passes through the inside of the rotating shaft 20. The outer diameter of the fixed shaft 30 is equal to the inner diameter of the rotating shaft 20. The fixed shaft 30 is a solid rod, while the rotating shaft 20 is a hollow rod. The fixed shaft 30 does not rotate, while the rotating shaft 20 rotates around the fixed shaft 30 under the drive of the motor 21.

[0033] In addition, the stirring frame 11 is fixed to the outer wall of the rotating shaft 20, and the stirring frame 22 is evenly distributed along the circumference of the rotating shaft 20. The stirring frame 22 rotates synchronously with the rotating shaft 20, and the stirring frame 22 can play a mixing and stirring role for the materials in the inner cavity.

[0034] In addition, the sliding sleeve 23 is slidably sleeved on the outside of the rotating shaft 20, the inner end of the blade 24 is fixed to the outer wall of the sliding sleeve 23, and the outer end of the blade 24 is provided with a groove 27 for sliding engagement with the stirring frame 22, so that the whole formed by the blade 24 and the sliding sleeve 23 can slide along the track formed by the rotating shaft 20 and the stirring frame 22.

[0035] It should be noted that a sliding groove 26 is provided on the rotating shaft 20 along the axial direction, and a pin 25 is screwed onto the sliding sleeve 23. The pin 25 is arranged radially along the sliding sleeve 23, and the inner end of the pin 25 is slidably engaged inside the sliding groove 26. The blade 24 is arranged radially along the sliding sleeve 23 as a whole, and the blade 24 is arranged in a one-to-one correspondence with the stirring frame 22.

[0036] In this embodiment, a guide groove 31 is provided on the fixed shaft 30, which is inclined in the circumferential direction. The guide groove 31 is a closed loop structure. The guide groove 31 is elliptical in shape and is inclined in parallel with the axis of the fixed shaft 30. The guide groove 31 and the slide groove 26 are arranged in a one-to-one correspondence. The inner end of the pin 25 passes through the slide groove 26 and is slidably engaged with the guide groove 31.

[0037] It should be noted that when the motor 21 drives the rotating shaft 20 to rotate, the stirring frame 22 and the blades 24 will rotate synchronously with the rotating shaft 20. At the same time, the pin 25, the slide groove 26 and the guide groove 31 will work together to make the sliding sleeve 23 move back and forth along the slide groove 26. That is, while the blades 24 are rotating with the stirring frame 22, they will also move back and forth along the axial direction of the rotating shaft 20.

[0038] It should be understood that since the blade 24 can not only rotate around the axial direction of the rotating shaft 20, but also reciprocate along the axial direction of the rotating shaft 20, it can not only stir the material in the circumferential direction, but also push the material back and forth in the axial direction, which can improve the mixing efficiency.

[0039] Compared to the mixer disclosed in patent CN213746712U, this embodiment has a simpler structural design and can also improve mixing efficiency.

[0040] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A fluidized bed fuel preheating system for furnaces, characterized in that, The device includes a mixer, in which a rotating shaft connected to a motor is provided in the inner cavity. A stirring frame is provided on the rotating shaft, and a sliding sleeve is fitted on the rotating shaft. The sliding sleeve is provided with blades that engage with the stirring frame. The sliding sleeve can reciprocate along the axial direction of the rotating shaft while rotating with the stirring frame.

2. The fluidized bed fuel preheating system as described in claim 1, characterized in that, A fixed shaft is fixedly connected to the inner cavity and passes through the inside of the rotating shaft.

3. The fluidized bed fuel preheating system as described in claim 2, characterized in that, The outer diameter of the fixed shaft is equal to the inner diameter of the rotating shaft.

4. The fluidized bed fuel preheating system as described in claim 3, characterized in that, The fixed shaft is provided with guide grooves that are inclined in the circumferential direction.

5. The fluidized bed fuel preheating system as described in claim 4, characterized in that, The rotating shaft is provided with a sliding groove arranged along the axial direction.

6. The fluidized bed fuel preheating system as described in claim 5, characterized in that, The sliding sleeve is provided with a pin that passes through the sliding groove and engages with the guide groove.

7. The fluidized bed fuel preheating system as described in claim 6, characterized in that, The pin is arranged radially along the sliding sleeve.

8. The fluidized bed fuel preheating system as described in claim 7, characterized in that, The blades are arranged radially along the sliding sleeve.

9. The fluidized bed fuel preheating system as described in claim 8, characterized in that, The outer end of the blade is provided with a groove that slides and engages with the stirring frame.

10. The fluidized bed fuel preheating system as described in claim 9, characterized in that, The stirring frames are evenly distributed circumferentially along the rotation axis.

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