A circulating fluidized bed boiler anti-wear device

Abstract

The present application relates to the field of circulating fluidized bed boiler tail gas treatment devices, and in particular to a circulating fluidized bed boiler anti-wear device, comprising a plurality of anti-wear grating plates one connected to a water-cooled wall at intervals and a plurality of anti-wear grating plates two connected to a water-cooled wall at intervals, wherein the length direction of the anti-wear grating plate one and the length direction of the anti-wear grating plate two are perpendicular to each other, and the anti-wear grating plate one and the anti-wear grating plate two are spliced ​​to form a grating anti-wear net. The provision of the grating anti-wear net in the present application guides the internal circulation of materials in the boiler, reduces the longitudinal and lateral terminal velocities of the gas-solid two-phase flow scouring the water-cooled wall, greatly reduces the friction and cutting force of the collision between the material particles and the water-cooled wall, and greatly reduces the wear of the gas-solid two-phase flow on the water-cooled wall, thereby extending the service life of the circulating fluidized bed boiler.

Description

Technical Field

[0001] The present application relates to the field of circulating fluidized bed boiler tail gas treatment devices, and in particular to a circulating fluidized bed boiler anti-wear device. Background Art

[0002] The circulating fluidized bed boiler is the most industrialized clean coal combustion device. The desulfurization process consists of an absorbent addition system, an absorption tower, a recycling system and an automatic control system.

[0003] The wear problem of the water-cooled wall of a circulating fluidized bed boiler is one of the main problems in the operation of the circulating fluidized bed boiler, which seriously affects the safety, stability and comprehensive benefits of the boiler. Utility Model Content

[0004] In order to improve the problem of water-cooled wall wear of a circulating fluidized bed boiler, the present application provides an anti-wear device for a circulating fluidized bed boiler.

[0005] The present application provides a circulating fluidized bed boiler anti-wear device, which adopts the following technical solution:

[0006] A circulating fluidized bed boiler anti-wear device comprises a plurality of anti-wear grating plates 1 connected to a water-cooled wall at intervals and a plurality of anti-wear grating plates 2 connected to the water-cooled wall at intervals, wherein the length direction of the anti-wear grating plate 1 and the length direction of the anti-wear grating plate 2 are perpendicular to each other, and the anti-wear grating plate 1 and the anti-wear grating plate 2 are spliced ​​to form a grating anti-wear net.

[0007] By adopting the above technical scheme, the anti-wear grating plate one and the anti-wear grating plate two are spliced ​​to form a grating anti-wear net, which can effectively reduce the flow velocity of the wall flow on the surface of the heating surface of the circulating fluidized bed boiler, and sequentially optimize the flow field of the wall flow to make the flow field smoother and more uniform. At the same time, the low-speed and uniform flue gas flow is not easy to cause wear to the heating surface of the boiler, and the internal circulation of the material in the boiler is guided, reducing the longitudinal and lateral terminal speeds of the gas-solid two-phase flow scouring the water-cooled wall, greatly reducing the friction and collision cutting force between the material particles and the water-cooled wall, and greatly reducing the wear of the gas-solid two-phase flow on the water-cooled wall, thereby extending the service life of the circulating fluidized bed boiler.

[0008] Optionally, a plurality of buffer plates are connected at intervals to an end surface of the anti-wear grid plate away from the water-cooled wall.

[0009] By adopting the above technical scheme, multiple buffer plates are connected at intervals on the end face of the anti-wear grating plate 1 away from the water-cooled wall, thereby increasing the contact area of ​​the anti-wear grating plate 1, further reducing the flow velocity of the wall flow on the heating surface of the circulating fluidized bed boiler, optimizing the flow field on the surface of the water-cooled wall, reducing the wear on the water-cooled wall, and thus improving the service life of the circulating fluidized bed boiler.

[0010] Optionally, a buffer space is left between adjacent buffer plates.

[0011] By adopting the above technical solution, the buffer space is located between adjacent buffer plates, and the buffer space is used for gas-solid two-phase flow to pass through, thereby reducing the friction and collision cutting force between the flow particles and the anti-wear grating plate one, thereby greatly reducing the wear of the gas-solid two-phase flow on the anti-wear grating plate one.

[0012] Optionally, a plurality of slow flow plates are connected at intervals to the end surface of the second anti-wear grid plate away from the water-cooled wall.

[0013] By adopting the above technical scheme, multiple slow flow plates are connected at intervals on the end face of the anti-wear grid plate 2 away from the water-cooled wall, thereby increasing the contact area of ​​the anti-wear grid plate 2, further reducing the flow velocity of the wall flow on the heating surface of the circulating fluidized bed boiler, optimizing the flow field on the surface of the water-cooled wall, reducing the wear on the water-cooled wall, and thus improving the service life of the circulating fluidized bed boiler.

[0014] Optionally, a slow flow space is left between adjacent slow flow plates.

[0015] By adopting the above technical solution, the slow flow space is located between adjacent slow flow plates, and the slow flow space is used for gas-solid two-phase flow to pass through, reducing the friction and collision cutting force between the flow particles and the anti-wear grating plate 2, thereby greatly reducing the wear of the gas-solid two-phase flow on the anti-wear grating plate 2.

[0016] Optionally, the second length direction of the anti-wear grating plate and the height direction of the boiler are parallel to each other, a scraper is slidably connected to a surface of the anti-wear grating plate, and a scraping end of the scraper abuts against a plate surface of the anti-wear grating plate.

[0017] By adopting the above technical solution, when the scraper slides on the surface of the anti-wear grating plate, the scraping end of the scraper abuts against the surface of the anti-wear grating plate, and the scraper can push the wall-adhering particles, destroy the downward flow of the wall-adhering particles, and reduce the descending speed of the wall-adhering particles, thereby reducing the wear on the water-cooled wall, thereby extending the service life of the circulating fluidized bed boiler.

[0018] Optionally, a surface of the anti-wear grating plate is rotatably connected to a screw rod, the scraper is threadedly connected to the outer wall of the screw rod, and the scraper slides on a surface of the anti-wear grating plate along the axis of the screw rod.

[0019] By adopting the above technical scheme, the screw rod is driven to rotate on the surface of the wear-resistant grating plate, driving the scraper to slide on the surface of the wear-resistant grating plate along the axis of the screw rod, so that the scraper is not easily offset when sliding on the surface of the wear-resistant grating plate, thereby improving the stability of the scraper sliding on the surface of the wear-resistant grating plate.

[0020] Optionally, a drive assembly is connected to the anti-wear grating plate, and the drive assembly includes a receiving plate, a rack and a gear. A sliding cavity for sliding movement of the receiving plate is formed on the inner wall of the buffer space, and a sliding groove for sliding movement of the rack is formed on the surface of the anti-wear grating plate. The sliding groove is connected to the sliding cavity, the rack passes through the sliding groove and is connected to the receiving plate surface, the gear is coaxially connected to the outer wall of the screw rod, and the rack meshes with the gear.

[0021] By adopting the above technical scheme, when the receiving plate is located at the end of the buffer space to receive the impact of the gas-solid two-phase flow, the receiving plate is driven to slide on the inner wall of the sliding chamber, one end of the gear is connected to the surface of the receiving plate, and the other end of the rack is penetrated by a sliding groove and meshes with the gear, driving the gear to rotate. The gear is coaxially connected to the outer wall of the screw rod, driving the scraper to slide on the surface of the anti-wear grid plate along the axis of the screw rod, thereby realizing directional driving of the scraper. No external power equipment is required to drive the scraper to slide, thereby reducing energy loss and embodying the concept of energy saving.

[0022] Optionally, the driving assembly also includes an elastic member, one end of the elastic member in the elastic direction is connected to the surface of the receiving plate, and the other end of the elastic member in the elastic direction is connected to the inner wall of the sliding cavity, and the elastic member has a tendency to drive the receiving plate to slide in a direction close to the screw rod.

[0023] By adopting the above technical solution, when the impact of the gas-solid two-phase flow on the receiving plate is reduced, the elastic force of the elastic member drives the receiving plate to slide in the direction close to the screw rod, thereby realizing automatic resetting of the receiving plate.

[0024] In summary, the present application includes at least one of the following beneficial technical effects:

[0025] 1. The setting of the grid anti-wear net can guide the internal circulation of materials in the boiler, reduce the terminal velocity of the gas-solid two-phase flow scouring the water-cooled wall in the longitudinal and transverse directions, greatly reduce the friction and collision cutting force between the material particles and the water-cooled wall, and greatly reduce the wear of the gas-solid two-phase flow on the water-cooled wall, thereby extending the service life of the circulating fluidized bed boiler;

[0026] 2. The setting of multiple buffer plates further reduces the flow velocity of the wall flow on the heating surface of the circulating fluidized bed boiler, optimizes the flow field on the water-cooled wall surface, reduces the wear on the water-cooled wall, and thus improves the service life of the circulating fluidized bed boiler;

[0027] 3. The setting of buffer space reduces the friction and collision cutting force between the flow particles and the anti-wear grid plate 1, thereby greatly reducing the wear of the anti-wear grid plate 1 by the gas-solid two-phase flow. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure in the embodiment of the present application.

[0029] Figure 2It is a partial cross-sectional view in an embodiment of the present application, mainly showing the drive assembly.

[0030] Explanation of the reference numerals in the accompanying drawings: 1. Wear-resistant grating plate one; 11. Grid wear-resistant net; 12. Sliding cavity; 13. Sliding groove; 2. Wear-resistant grating plate two; 3. Water-cooled wall; 4. Buffer plate; 41. Buffer space; 5. Slow-flow plate; 51. Slow-flow space; 6. Scraper; 7. Screw rod; 8. Drive assembly; 81. Socket plate; 82. Rack; 83. Gear; 84. Elastic member. DETAILED DESCRIPTION

[0031] The following is combined with Figure 1-2 This application is described in further detail.

[0032] The present application embodiment discloses a circulating fluidized bed boiler anti-wear device. Figure 1 A circulating fluidized bed boiler anti-wear device includes a plurality of anti-wear grating plates 1 uniformly welded and fixed on a water-cooled wall 3 and a plurality of anti-wear grating plates 2 uniformly welded and fixed on the water-cooled wall 3, the length direction of the anti-wear grating plates 2 and the height direction of the boiler are parallel to each other, and the length direction of the anti-wear grating plates 2 and the length direction of the anti-wear grating plates 1 are perpendicular to each other, and the anti-wear grating plates 1 and 2 are spliced ​​to form a grating anti-wear net 11.

[0033] Reference Figure 1 In the embodiment of the present application, the materials of the wear-resistant grating plate 1 and the wear-resistant grating plate 2 are both grating alloy plates, which are precision-casted using a variety of metal materials to ensure that the operating environment temperature can reach 1250°C, and can resist wear, creep and oxidation under high temperature and high pressure; the end surface of the wear-resistant grating plate 1 away from the water-cooled wall 3 is evenly fixed with a plurality of buffer plates 4, and a buffer space 41 is left between adjacent buffer plates 4; the end surface of the wear-resistant grating plate 2 away from the water-cooled wall 3 is evenly fixed with a plurality of slow flow plates 5, and a slow flow space 51 is left between adjacent slow flow plates 5.

[0034] Reference Figure 1 A scraper 6 is slidably connected to the surface of the wear-resistant grating plate 1, and the scraping end of the scraper 6 can abut against the surface of the wear-resistant grating plate 1, and the sliding direction of the scraper 6 and the width direction of the wear-resistant grating plate 1 are parallel to each other; a slider is fixed to the end face of the scraper 6 facing the wear-resistant grating plate 2, and a sliding groove for the sliding of the slider is provided on the surface of the wear-resistant grating plate 2. In the embodiment of the present application, the sliding groove is a strip groove, and the length direction of the sliding groove and the length direction of the wear-resistant grating plate 2 are parallel to each other. When the scraper 6 slides on the surface of the wear-resistant grating plate 1, the slider is driven to slide on the inner wall of the sliding groove, so that the scraper 6 is not easy to separate from the wear-resistant grating plate 1, thereby ensuring the stability of the scraper 6 sliding on the surface of the wear-resistant grating plate 1.

[0035] Reference Figure 1The surface of the anti-wear grating plate 1 is rotatably connected with a screw rod 7, the axis of the screw rod 7 and the width direction of the anti-wear grating plate 1 are parallel to each other, the scraper 6 is threadedly connected to the outer wall of the screw rod 7, and the scraper 6 slides on the surface of the anti-wear grating plate 1 along the axis of the screw rod 7, thereby realizing the directional sliding of the scraper 6 on the surface of the anti-wear grating plate 1.

[0036] Reference Figure 1 and Figure 2 A driving assembly 8 is connected to the anti-wear grating plate 1, and the driving assembly 8 can drive the screw rod 7 to rotate on the surface of the anti-wear grating plate 1; the driving assembly 8 includes a receiving plate 81, a rack 82, a gear 83 and an elastic member 84, the gear 83 is coaxially welded and fixed to the outer periphery of the screw rod 7, and a sliding cavity 12 for sliding movement of the receiving plate 81 is provided on the inner wall of the buffer space 41, and the sliding direction of the receiving plate 81 and the height direction of the anti-wear grating plate 1 are parallel to each other, and a sliding groove 13 for sliding movement of the rack 82 is provided on the surface of the anti-wear grating plate 1, and the sliding direction of the rack 82 and the sliding direction of the receiving plate 81 are parallel to each other, and the sliding groove 13 is connected to the sliding cavity 12, one end of the rack 82 meshes with the gear 83, and the other end of the rack 82 is penetrated by the sliding groove 13 and fixed to the surface of the receiving plate 81.

[0037] Reference Figure 2 The elastic member 84 can be a compression spring or a tension spring. In the embodiment of the present application, the elastic member 84 is a compression spring with a certain deformation ability. One end of the elastic member 84 in the elastic direction is fixed to the inner wall of the sliding cavity 12, and the other end of the elastic member 84 in the elastic direction is fixed to the surface of the receiving plate 81. The elastic member 84 is located on the side of the receiving plate 81 away from the screw rod 7. The elastic member 84 has a tendency to drive the receiving plate 81 to slide on the inner wall of the sliding cavity 12 toward the direction close to the screw rod 7.

[0038] Reference Figure 1 and Figure 2 When the gas-solid two-phase flow impacts the surface of the receiving plate 81, the receiving plate 81 slides in the sliding chamber 12 in the direction away from the screw rod 7, and the rack 82 is fixed on the surface of the receiving plate 81, driving the rack 82 to slide on the inner wall of the sliding groove 13. The rack 82 meshes with the gear 83, driving the screw rod 7 to rotate around its own axis, driving the scraper 6 to slide on the surface of the anti-wear grid plate 1 along the axis of the screw rod 7. The scraping end of the scraper 6 abuts against the surface of the anti-wear grid plate 1. The scraper 6 can push the wall-attached particles, destroy the downward flow of the wall-attached particles, and reduce the descending speed of the wall-attached particles, thereby reducing the wear on the water-cooled wall 3, thereby extending the service life of the circulating fluidized bed boiler.

[0039] The implementation principle of a circulating fluidized bed boiler anti-wear device in an embodiment of the present application is as follows: anti-wear grating plate 1 and anti-wear grating plate 2 are spliced ​​to form a grating anti-wear net 11, which can effectively reduce the flow velocity of the wall flow on the surface of the heating surface of the circulating fluidized bed boiler, and sequentially optimize the flow field of the wall flow to make the flow field smoother and more uniform. At the same time, the low-speed and uniform flue gas flow is not easy to cause wear to the heating surface of the boiler, and the internal circulation of the material in the boiler is guided, reducing the longitudinal and lateral terminal speeds of the gas-solid two-phase flow scouring the water-cooled wall 3, greatly reducing the friction and collision cutting force between the material particles and the water-cooled wall 3, and greatly reducing the wear of the gas-solid two-phase flow on the water-cooled wall 3, thereby extending the service life of the circulating fluidized bed boiler.

[0040] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A circulating fluidized bed boiler anti-wear device, characterized in that: The invention comprises a plurality of wear-resistant grating plates one (1) connected to a water-cooled wall (3) at intervals and a plurality of wear-resistant grating plates two (2) connected to the water-cooled wall (3) at intervals, wherein the length direction of the wear-resistant grating plates one (1) and the length direction of the wear-resistant grating plates two (2) are perpendicular to each other, and the wear-resistant grating plates one (1) and the wear-resistant grating plates two (2) are spliced ​​to form a grating wear-resistant net (11).

2. The anti-wear device for a circulating fluidized bed boiler according to claim 1, characterized in that: The end surface of the anti-wear grid plate 1 (1) away from the water-cooled wall (3) is connected to a plurality of buffer plates (4) at intervals.

3. The anti-wear device for a circulating fluidized bed boiler according to claim 2, characterized in that: A buffer space (41) is reserved between adjacent buffer plates (4).

4. The anti-wear device for a circulating fluidized bed boiler according to claim 1, characterized in that: The end surface of the second anti-wear grid plate (2) away from the water-cooled wall (3) is connected with a plurality of slow flow plates (5) at intervals.

5. The anti-wear device for a circulating fluidized bed boiler according to claim 4, characterized in that: A slow flow space (51) is reserved between adjacent slow flow plates (5).

6. The anti-wear device for a circulating fluidized bed boiler according to claim 3, characterized in that: The length direction of the second anti-wear grating plate (2) and the height direction of the boiler are parallel to each other, and a scraper (6) is slidably connected to the surface of the first anti-wear grating plate (1), and the scraping end of the scraper (6) abuts against the surface of the first anti-wear grating plate (1).

7. The anti-wear device for a circulating fluidized bed boiler according to claim 6, characterized in that: The surface of the anti-wear grating plate (1) is rotatably connected to a screw rod (7), the scraper (6) is threadedly connected to the outer wall of the screw rod (7), and the scraper (6) slides on the surface of the anti-wear grating plate (1) along the axis of the screw rod (7).

8. The anti-wear device for a circulating fluidized bed boiler according to claim 7, characterized in that: The wear-resistant grating plate (1) is connected to a driving assembly (8), the driving assembly (8) comprising a receiving plate (81), a rack (82) and a gear (83); the inner wall of the buffer space (41) is provided with a sliding cavity (12) for the receiving plate (81) to slide; the surface of the wear-resistant grating plate (1) is provided with a sliding groove (13) for the rack (82) to slide; the sliding groove (13) is connected to the sliding cavity (12); the rack (82) passes through the sliding groove (13) and is connected to the surface of the receiving plate (81); the gear (83) is coaxially connected to the outer wall of the screw rod (7), and the rack (82) meshes with the gear (83).

9. The anti-wear device for a circulating fluidized bed boiler according to claim 8, characterized in that: The driving assembly (8) further comprises an elastic member (84), one end of the elastic member (84) in the elastic force direction is connected to the surface of the receiving plate (81), and the other end of the elastic member (84) in the elastic force direction is connected to the inner wall of the sliding cavity (12), and the elastic member (84) has a tendency to cause the receiving plate (81) to slide in a direction close to the screw rod (7) by elastic force.

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