High-temperature flue gas bypass flue guide device

Abstract

The utility model provides a kind of high-temperature flue gas bypass flue flow guide device, it is related to thermal power plant flue gas flow guide technical field, and it includes: flue gas cyclone barrel and cylinder cover, flue gas cyclone barrel upper end cylinder surface is fixed with cylinder cover by screwing, wear-resistant lining cylinder is inserted and connected and installed in the flue gas cyclone barrel, anti-vibration cylinder frame is distributed to the flue gas cyclone barrel outside cover, the anti-vibration cylinder frame inboard is supported by damper strut and flue gas cyclone barrel cone cylinder wall, the left and right symmetrical tuning mass damper is installed between the flue gas cyclone barrel side cylinder wall and anti-vibration cylinder frame, the tuning mass damper is connected with flue gas cyclone barrel and anti-vibration cylinder frame by spring guide rod distribution, the mass is installed on the spring guide rod rod surface by plate body, and the mass side end is supported by viscous damper and anti-vibration cylinder frame inner wall.The utility model solves the problem that the rapid cyclone of flue gas in cyclone barrel in prior art can easily cause strong mechanical resonance of flue flow guide device, causing structural damage.

Description

Technical Field

[0001] This utility model relates to the field of flue gas diversion technology in thermal power plants, specifically to a high-temperature flue gas bypass flue diversion device. Background Technology

[0002] High-temperature flue gas bypass ducts in thermal power plants are mainly used for flue gas regulation during unit start-up and shutdown. Through the coordination of guide baffles in the main flue and bypass flue, they ensure the denitrification system is properly operational before unit grid connection and that NOx emissions meet standards. A search revealed existing technology (Announcement No.: CN202420973954.X) for a high-temperature bypass flue gas guiding device. The document describes that "in this invention, flue gas that has not been dried in time is introduced into the vortex tube through the first flue gas guide pipe. When it passes through the spirally designed vortex blades, the vortex blades can send the flue gas in a swirling state downwards along the vortex tube to the second flue gas guide pipe." Inside the flow tube, during the swirling of flue gas within the cyclone tube, fine droplets of flue gas that were not promptly dried by the heat generated by the air preheater, along with soot particles within these droplets, are separated from the flue gas by centrifugal force. The separated droplets and soot particles collide with the inner wall of the cyclone tube and eventually slide down into the dust accumulation groove. This effectively prevents the accumulation of fine droplets mixed with soot particles in the second flue gas guide tube, thus avoiding the risk of ash blockage in the bypass flue. However, in the existing technology, the rapid swirling of flue gas within the cyclone tube can easily cause strong mechanical resonance in the flue gas guide device, resulting in structural damage. Utility Model Content

[0003] To overcome the shortcomings of existing technologies, a high-temperature flue gas bypass flue guide device is provided to solve the problem that the rapid swirling of flue gas in the swirl tube can easily cause strong mechanical resonance in the flue guide device, resulting in structural damage.

[0004] To achieve the above objectives, a high-temperature flue gas bypass flue gas guiding device is provided, comprising: a flue gas swirl cylinder and a cylinder cover, wherein the cylinder cover is screwed and fixed to the upper end of the flue gas swirl cylinder. A wear-resistant liner is inserted into the inner side of the flue gas cyclone. An anti-vibration cylinder frame is distributed and covered on the outer side of the flue gas cyclone. The inner side of the anti-vibration cylinder frame is supported by a damping column to the conical wall of the flue gas cyclone. Tuned mass dampers are symmetrically installed between the side wall of the flue gas cyclone and the anti-vibration cylinder frame. The tuned mass dampers are distributed and connected to the flue gas cyclone and the anti-vibration cylinder frame through spring guide rods. A mass block is installed on the surface of the spring guide rod through a plate. The side end of the mass block is supported by a viscous damper to the inner wall of the anti-vibration cylinder frame.

[0005] Furthermore, the left end of the flue gas cyclone is connected to the anti-vibration cylinder frame via a first corrugated pipe, the lower end of the flue gas cyclone is connected to an ash discharge pipe, and a flue is installed on the left side of the anti-vibration cylinder frame.

[0006] Furthermore, the flue is shaped to expand to the left and contract to the right, and the flue is connected to the inner cavity of the flue gas swirl tube through the first corrugated pipe.

[0007] Furthermore, the outer side of the wear-resistant liner is connected to the flue gas cyclone tube via ribs, and a tube cover is pressed and fixed at the upper end of the wear-resistant liner.

[0008] Furthermore, the lower end of the cylinder cover is tightly attached to the inner wall of the wear-resistant liner through a sealing gasket, and the wear-resistant liner is made of high-chromium cast iron metal matrix with a ceramic inner lining layer.

[0009] Furthermore, a smoke exhaust steel pipe is fixed to the upper end of the cylinder cover; and the lower end of the smoke exhaust steel pipe is inserted into the wear-resistant liner, and the side end of the smoke exhaust steel pipe is connected to the flue gas bypass duct through a second corrugated pipe.

[0010] Furthermore, the tuned mass damper is provided with a spring guide rod, a mass block, and a viscous damper.

[0011] The beneficial effects of this utility model are as follows: The high-temperature flue gas bypass duct guide device of this utility model utilizes a tuned mass damper, damping support, and anti-vibration cylinder to form an anti-vibration structure. The tuned mass damper and damping support support the flue gas swirl tube at intervals, buffering and offsetting the impact vibration of the flue gas swirl tube, effectively suppressing and reducing the resonance amplitude caused by the rapidly swirling high-temperature flue gas, preventing structural damage caused by the overall mechanical resonance of the bypass duct guide device, and extending the service life of the bypass duct guide device; the wear-resistant liner made of ceramic lining and metal-based composite material is inserted and assembled inside the flue gas swirl tube, realizing the replaceable structure of the liner, which facilitates the individual replacement of the easily worn flue gas guide liner and reduces the maintenance cost of the bypass duct guide device. Attached Figure Description

[0012] Figure 1 This is a front view structural schematic diagram of the high-temperature flue gas bypass flue guiding device according to an embodiment of the present utility model.

[0013] Figure 2 This is a front view cross-sectional structural diagram of the high-temperature flue gas bypass flue guide device according to an embodiment of the present invention.

[0014] Figure 3 This is a front view cross-sectional structural diagram of the flue gas cyclone tube according to an embodiment of the present utility model.

[0015] Figure 4 This is a schematic diagram of the structure of the wear-resistant liner according to an embodiment of the present invention.

[0016] In the diagram: 1. Flue gas cyclone; 11. Ash discharge pipe; 12. First corrugated pipe; 13. Wear-resistant liner; 14. Rib; 2. Flue gas duct; 3. Cover; 31. Exhaust pipe; 32. Second corrugated pipe; 33. Sealing gasket; 4. Vibration-resistant frame; 41. Damping support; 5. Tuned mass damper; 51. Spring guide rod; 52. Mass block; 53. Viscous damper. Detailed Implementation

[0017] Reference Figures 1 to 4 As shown, this utility model provides a high-temperature flue gas bypass flue gas guiding device, including: a flue gas swirl cylinder 1 and a cylinder cover 3, wherein the cylinder cover 3 is screwed and fixed to the upper end of the flue gas swirl cylinder 1. A wear-resistant liner 13 is inserted and installed inside the flue gas cyclone 1. An anti-vibration cylinder frame 4 is distributed and covered on the outside of the flue gas cyclone 1. The inner side of the anti-vibration cylinder frame 4 is supported by the cone wall of the flue gas cyclone 1 through a damping support 41. Tuned mass dampers 5 are symmetrically installed between the side wall of the flue gas cyclone 1 and the anti-vibration cylinder frame 4. The tuned mass dampers 5 are distributed and connected to the flue gas cyclone 1 and the anti-vibration cylinder frame 4 through spring guide rods 51. A mass block 52 is installed on the rod surface of the spring guide rod 51 through the plate. The side end of the mass block 52 is supported by the inner wall of the anti-vibration cylinder frame 4 through a viscous damper 53.

[0018] When the bypass flue gas diversion device is in operation, high-temperature flue gas is first transported through the main flue of the thermal power plant to the pipeline connected to the flue gas diversion duct 2. Following the Venturi principle, the flue gas accelerates through the flue gas diversion duct 2 and the first corrugated pipe 12 into the flue gas cyclone cylinder 1. It then undergoes centrifugal swirling along the cylindrical shape of the cyclone cylinder 1, causing particulate dust in the flue gas to be thrown off. The flue gas then flows out of the flue gas cyclone cylinder 1 from the exhaust pipe 31 and then flows into the bypass flue gas duct. When the flue gas swirls inside the flue gas cyclone cylinder 1, the impact on the cylinder body causes vibration. When this vibration is transmitted outwards, it is buffered by the tuned mass damper 5 and the damping support 41, suppressing and reducing the resonance amplitude caused by the rapidly swirling high-temperature flue gas, thus preventing structural damage caused by overall mechanical resonance of the bypass flue gas diversion device.

[0019] In this embodiment, the left end of the flue gas cyclone 1 is connected to the vibration-damping frame 4 via a first corrugated pipe 12. The lower end of the flue gas cyclone 1 is connected to an ash discharge pipe 11, and a flue duct 2 is installed on the left side of the vibration-damping frame 4. The flue duct 2 is shaped to expand on the left and contract on the right, and it is connected to the inner cavity of the flue gas cyclone 1 via the first corrugated pipe 12.

[0020] As a preferred embodiment, the corrugated structure of the first corrugated pipe 12 can disperse and absorb the transmission of vibration, preventing the vibration of the flue gas swirl tube 1 from causing resonance in the flue gas duct 2. The left-expanding and right-contracting flue gas duct 2 causes the high-temperature flue gas to form a local contraction at the narrowing point, thereby increasing the flow rate of the high-temperature flue gas. The high-speed flue gas enters the tube along the cross-section of the flue gas swirl tube 1 and moves in a centrifugal swirling motion within the flue gas swirl tube 1. During the swirling motion, dust particles in the flue gas are thrown out, which facilitates the separation of dust particles in the flue gas and prevents dust particles in the flue gas from clogging the pipe during subsequent flow.

[0021] In this embodiment, the outer side of the wear-resistant liner 13 is inserted into the flue gas swirl tube 1 via ribs 14, and a tube cover 3 is pressed and fixed to the upper end of the wear-resistant liner 13. The lower end of the tube cover 3 is tightly attached to the inner wall of the wear-resistant liner 13 via a sealing gasket 33, and the wear-resistant liner 13 is composited with a ceramic inner lining layer made of high-chromium cast iron metal base. A flue gas exhaust pipe 31 is fixed to the upper end of the tube cover 3; and the lower end of the flue gas exhaust pipe 31 is inserted into the wear-resistant liner 13, and the side end of the flue gas exhaust pipe 31 is connected to the flue gas bypass flue via a second corrugated pipe 32.

[0022] As a preferred embodiment, the rib 14 facilitates the positioning and insertion of the wear-resistant liner 13 into the flue gas cyclone 1, forming a replaceable liner flue gas cyclone 1. When the inner cylinder of the flue gas cyclone 1 is severely worn by particulate matter in the flue gas, only the wear-resistant liner 13 needs to be replaced, reducing the maintenance cost of the flue gas guiding device. The wear-resistant liner 13, made of high-chromium cast iron metal matrix and ceramic composite material, has extremely high hardness, wear resistance, and temperature resistance, while reducing the resistance of the flue gas cyclone.

[0023] In this embodiment, the tuned mass damper 5 is provided with a spring guide rod 51, a mass block 52 and a viscous damper 53.

[0024] In a preferred embodiment, the mass block 52 is the core component of the tuned mass damper 5, and its function is to counteract the dynamic force of the flue gas cyclone 1 vibration through its own inertia. The spring guide rod 51 connects the mass block 52 and the main structure, while providing the necessary elastic restoring force. The viscous damper 53 is used to dissipate the energy during the vibration process, limit the excessive movement of the mass block, and prevent excessive deformation of the structure, so that the tuned mass damper 5 can counteract the vibration energy of the flue gas cyclone 1, thereby reducing the amplitude of the flue gas cyclone 1 and achieving the purpose of preventing resonance.

[0025] This utility model's high-temperature flue gas bypass flue guide device effectively solves the problem in the prior art where the rapid swirling of flue gas inside the swirl tube easily causes strong mechanical resonance in the flue guide device, resulting in structural damage. It effectively suppresses and reduces the resonance amplitude caused by the rapid swirling high-temperature flue gas, preventing overall mechanical resonance of the bypass flue guide device from causing structural damage and extending the service life of the bypass flue guide device. It also facilitates the individual replacement of easily worn flue gas guide liner, reducing the maintenance cost of the bypass flue guide device, and is suitable for high-temperature flue gas bypass flue guide devices.

Claims

1. A high temperature flue gas bypass duct flow guiding device, comprising: A flue gas swirl tube (1) and a tube cover (3), wherein the tube cover (3) is screwed and fixed to the upper end of the flue gas swirl tube (1), characterized in that: A wear-resistant liner (13) is inserted into the inner side of the flue gas cyclone (1). An anti-vibration cylinder frame (4) is distributed on the outer side of the flue gas cyclone (1). The inner side of the anti-vibration cylinder frame (4) is supported by a damping support (41) to the conical wall of the flue gas cyclone (1). Tuned mass dampers (5) are symmetrically installed between the side wall of the flue gas cyclone (1) and the anti-vibration cylinder frame (4). The tuned mass dampers (5) are connected to the flue gas cyclone (1) and the anti-vibration cylinder frame (4) through spring guide rods (51). A mass block (52) is installed on the rod surface of the spring guide rod (51) through a plate. The side end of the mass block (52) is supported by a viscous damper (53) to the inner wall of the anti-vibration cylinder frame (4).

2. A high temperature flue gas bypass flue guide device according to claim 1, wherein, The left end of the flue gas cyclone (1) is connected to the vibration-damping frame (4) through the first corrugated pipe (12). The lower end of the flue gas cyclone (1) is connected to the ash discharge pipe (11). The left side of the vibration-damping frame (4) is equipped with a flue gas duct (2).

3. The high-temperature flue gas bypass flue gas guiding device according to claim 2, characterized in that, The flue (2) is oriented with the left side expanding and the right side contracting. The flue (2) is connected to the inner cavity of the flue gas swirl tube (1) through the first corrugated pipe (12).

4. The high temperature flue gas bypass duct flow guiding device of claim 1, wherein, The outer side of the wear-resistant liner (13) is connected to the flue gas cyclone tube (1) by ribs (14), and the upper end of the wear-resistant liner (13) is pressed and fixed with a tube cover (3).

5. A high temperature flue gas bypass flue guide device according to claim 4, wherein, The lower end of the cylinder cover (3) is tightly attached to the inner wall of the wear-resistant liner (13) through a sealing gasket (33). The wear-resistant liner (13) is made of high-chromium cast iron metal base with a ceramic inner lining layer.

6. A high-temperature flue gas bypass flue gas guiding device according to claim 1, characterized in that, The upper end of the cylinder cover (3) is fixed with a smoke exhaust steel pipe (31); and the lower end of the smoke exhaust steel pipe (31) is inserted into the wear-resistant liner (13). The side end of the smoke exhaust steel pipe (31) is connected to the flue gas bypass flue through the second corrugated pipe (32).

7. A high temperature flue gas bypass flue guide device according to claim 1, wherein, The tuned mass damper (5) is provided with a spring guide rod (51), a mass block (52) and a viscous damper (53).

Images