Dust removal system for strengthening gas-solid separation

Abstract

The invention belongs to the technical field of emission and dust removal of coal-fired power plants, and discloses a dust removal system for strengthening gas-solid separation, which is applied to a turning flue where a horizontal flue and a vertical flue are connected, and comprises a flue expansion structure, an ash catching device, a back flushing device and an ash bucket. The design thought of a traditional straight flue is broken through, the physical space of a coal-fired unit is fully utilized, a flue expansion structure is additionally arranged at a steering flue, a high-concentration dust particle area with a certain height is formed, and an ash catching device, a back flushing device and an ash hopper which are matched are arranged in the steering flue expansion area. Part of dust particles directly fall into the lower dust hopper, and part of the dust particles are filtered by the metal net assembly and blown into the lower dust hopper by the back flushing device to be collected. The expansion flue is additionally arranged, so that the flue gas circulation sectional area has no obvious change or even is slightly increased, the increased flue gas resistance of the whole dust removal system is less than 100Pa, and the influence of a turning flue on the resistance of a wind and flue gas system is ignored.

Description

Technical Field

[0001] This invention relates to the field of dust removal technology for coal-fired power plants, and in particular to a dust removal system that enhances gas-solid separation. Background Technology

[0002] In recent years, the ash content of coal fed into coal-fired power plants has shown a significant upward trend, exceeding the ash content of the design and verification coal types. This further exacerbates problems such as low-temperature corrosion, blockage, and wear in downstream equipment like denitrification catalysts, air preheaters, low-temperature economizers, and electrostatic precipitators. Therefore, achieving high-efficiency pre-dust removal is an effective way to alleviate or even solve these problems, while simultaneously meeting increasingly stringent ultra-low emission requirements.

[0003] Due to physical space constraints, coal-fired boilers (especially π-type boilers) have multiple 90° turning flues in their tail flue. Because these bends separate the gas-solid two-phase flow, high-concentration dust particle areas exist on the outer walls of these bends, with particle concentrations reaching tens of times the average. Installing ash hoppers (such as economizer ash hoppers or denitrification ash hoppers) and silo pump ash conveying systems at these 90° turning flues allows for pre-dust removal in the upstream flue of low-temperature electrostatic precipitators or bag filters, mitigating wear and ash accumulation in the boiler's tail flue equipment and reducing the workload of electrostatic precipitators or bag filters. According to existing designs, the dust removal efficiency of a single ash hopper is only 3%-5%, indicating significant room for improvement.

[0004] Currently, to address the problem of catalyst blockage and wear caused by large particulate ash, commonly used pre-removal technologies for large particulate ash include: (1) arranging fly ash interception devices with large apertures to collect large particulate ash through collision and settling; (2) arranging screens or perforated plates to collect dust through filtration, collision, and settling. The smaller the mesh size of the ash collection device in the above schemes, the higher the dust removal efficiency, but the greater the flue gas resistance; moreover, if the mesh size is too small, the ash collection device will be completely blocked, and the dust removal efficiency will be significantly reduced. In addition, their main purpose is only to remove large particulate ash, and they all occupy the original flue gas flow area, which has a significant impact on the flue gas flow field.

[0005] Therefore, there is an urgent need to propose a dust removal system that enhances gas-solid separation to solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to provide a dust removal system that enhances gas-solid separation, thereby improving dust removal efficiency without occupying the original flue gas flow area and reducing the impact of the enhanced gas-solid separation dust removal system on the flue gas flow field.

[0007] To achieve this objective, the present invention adopts the following technical solution:

[0008] A dust removal system for enhanced gas-solid separation is applied at a turning flue where a horizontal flue and a vertical flue connect. The enhanced gas-solid separation dust removal system includes:

[0009] The flue expansion structure includes an expansion flue, one end of which is connected to a horizontal flue via a first flue, and the other end of which is connected to a vertical flue via a second flue. The axis of the first flue is inclined along the axis of the horizontal flue in a direction away from the vertical flue, and the axis of the second flue is inclined along the axis of the vertical flue in a direction away from the horizontal flue.

[0010] The ash collection device is located at the connection between the second flue and the expansion flue. The ash collection device includes a metal mesh assembly, the working surface of which is perpendicular to the flow direction of the flue gas.

[0011] The back-flushing device is located downstream of the ash collection device along the flow direction of the flue gas, and the air outlet of the back-flushing device faces the ash collection device.

[0012] The ash hopper is located at the lower end of the working surface of the metal mesh assembly.

[0013] Preferably, an arc-shaped guide plate is provided at the first flue, and the arc-shaped guide plate bends toward the ash hopper.

[0014] Preferably, the number of arc-shaped guide vanes is at least two, with each pair of arc-shaped guide vanes forming a group, and each group of arc-shaped guide vanes being spaced apart along their extension direction.

[0015] Preferably, a straight guide plate is provided at the horizontal flue, and the straight guide plate is inclined along the axis of the horizontal flue in a direction away from the vertical flue.

[0016] Preferably, the number of straight guide vanes is at least two, and the at least two straight guide vanes are spaced apart along a direction perpendicular to the axis of the first flue.

[0017] Preferably, the metal mesh assembly includes a first metal mesh, a second metal mesh, and a third metal mesh, which are arranged sequentially at intervals along the flow direction of the flue gas.

[0018] Preferably, the ash collection device also includes a baffle plate, which is located upstream of the first metal mesh along the flow direction of the flue gas.

[0019] As a preferred embodiment, the dust removal system for enhanced gas-solid separation also includes a compressed air source, the outlet of which is connected to the inlet of the backflushing device.

[0020] As a preferred embodiment, the enhanced gas-solid separation dust removal system also includes a dust collection device and a hopper pump. The inlet of the hopper pump is connected to the outlet of the dust hopper, the inlet of the dust collection device is connected to the outlet of the hopper pump, and the hopper pump is connected to the outlet of the compressed air source.

[0021] As a preferred embodiment, the flue expansion structure also includes an irregularly shaped corner flue, the inner wall of which is directly opposite the inner wall of the expansion flue, one end of which is connected to the inner wall of the horizontal flue, and the other end of which is connected to the inner wall of the vertical flue.

[0022] The beneficial effects of this invention are:

[0023] This invention provides an enhanced gas-solid separation dust removal system applied at the junction of horizontal and vertical flues. The system includes a flue expansion structure, an ash collection device, a backflushing device, and an ash hopper. Breaking away from traditional straight flue design, this system fully utilizes the physical space of coal-fired units by adding a flue expansion structure at the junction of horizontal and vertical flues (e.g., from the economizer outlet to the denitrification horizontal flue, from the denitrification horizontal flue to the vertical flue, from the denitrification outlet to the air preheater inlet flue, from the air preheater outlet to the low-temperature economizer flue, etc.). This creates a high-concentration dust particle area of ​​a certain height. Appropriate ash collection devices, backflushing devices, and ash hoppers are arranged within this expansion area. After the flue gas containing high-concentration dust particles slows down, some dust particles fall directly into the lower ash hopper, while others are filtered by the downstream metal mesh assembly and then swept into the lower ash hopper by the backflushing device. This results in a comprehensive dust removal efficiency of 10%-20% for a single junction flue ash collection device. By adding an expanded flue, the cross-sectional area of ​​the flue gas flow remains unchanged or even increases slightly. The increased flue gas resistance of the entire enhanced gas-solid separation dust removal system is less than 100Pa (can be lower than 0Pa), thus the influence of the diversion flue on the resistance of the air-to-smoke system can be ignored. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the enhanced gas-solid separation dust removal system provided in this embodiment;

[0025] Figure 2 This is a schematic diagram of the ash-collecting device provided in this embodiment;

[0026] Figure 3 This is a design flowchart of the enhanced gas-solid separation dust removal system provided in this embodiment;

[0027] Figure 4 This is a schematic diagram of the dust concentration distribution of the dust collection device provided in this embodiment.

[0028] In the picture:

[0029] 11. Horizontal flue; 111. Straight guide vane; 12. Vertical flue; 13. First flue; 131. Arc-shaped guide vane; 14. Second flue; 21. Expansion flue; 22. Irregular corner flue; 30. Ash collection device; 31. Metal mesh assembly; 311. First metal mesh; 312. Second metal mesh; 313. Third metal mesh; 32. Baffle plate; 40. Backflushing device; 50. Ash hopper; 60. Compressed air source; 70. Dust collection device; 80. Silo pump. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0031] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0032] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0033] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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 the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0034] This embodiment provides a dust removal system that enhances gas-solid separation, increasing dust removal efficiency without occupying the original flue gas flow area, thus reducing the impact of the dust removal system on the flue gas flow field.

[0035] Specifically, such as Figures 1 to 2 As shown, an enhanced gas-solid separation dust removal system is applied at the turning flue where the horizontal flue 11 and the vertical flue 12 are connected. The enhanced gas-solid separation dust removal system includes a flue expansion structure, an ash collection device 30, a back-blowing device 40, and an ash hopper 50.

[0036] The flue expansion structure includes an expansion flue 21. One end of the expansion flue 21 is connected to the horizontal flue 11 via a first flue 13, and the other end of the expansion flue 21 is connected to the vertical flue 12 via a second flue 14. The axis of the first flue 13 is inclined along the axis of the horizontal flue 11 in a direction away from the vertical flue 12, and the axis of the second flue 14 is inclined along the axis of the vertical flue 12 in a direction away from the horizontal flue 11, thereby increasing the cross-sectional area of ​​flue gas flow and reducing the impact on the flue gas flow field.

[0037] The dust collection device 30 is located at the connection between the second flue 14 and the expansion flue 21. The dust collection device 30 includes a metal mesh assembly 31. The working surface of the metal mesh assembly 31 is perpendicular to the flow direction of the flue gas and is used to filter dust particles in the flue gas to increase the dust removal efficiency.

[0038] The back-blowing device 40 is located downstream of the dust collection device 30 along the flow direction of the flue gas, and the air outlet of the back-blowing device 40 is directly facing the metal mesh assembly 31. It blows the dust particles captured by the metal mesh assembly 31 into the dust hopper 50, which can prevent the metal mesh assembly 31 from clogging and maintain the best overall dust removal efficiency.

[0039] The ash hopper 50 is used to receive dust particles filtered by the metal mesh assembly 31, preventing smaller dust particles from falling directly and causing secondary pollution. The ash hopper 50 is located at the lower end of the working surface of the metal mesh assembly 31, and larger dust particles in the flue gas can fall directly into the ash hopper 50.

[0040] Breaking away from the traditional straight flue design, this project fully utilizes the physical space of the coal-fired unit by adding flue expansion structures at the turning flues of the horizontal flue 11 and vertical flue 12 (such as from the economizer outlet to the denitrification horizontal flue 11, from the denitrification horizontal flue 11 to the vertical flue 12, from the denitrification outlet to the air preheater inlet flue, and from the air preheater outlet to the low-temperature economizer flue). This creates a high-concentration dust particle area of ​​a certain height. Suitable ash-collecting devices 30, back-blowing devices 40, and ash hoppers 50 are arranged in the turning flue expansion area. After the flue gas containing high-concentration dust particles slows down, some dust particles fall directly into the lower ash hopper 50 for collection, while others are filtered by the downstream metal mesh assembly 31 and blown into the lower ash hopper 50 by the back-blowing device 40. This allows the overall dust removal efficiency of the ash-collecting device 30 at a single turning flue to reach 10%-20%. By adding an expanded flue duct 21, the cross-sectional area of ​​the flue gas flow remains largely unchanged or even slightly increases. The increased flue gas resistance of the entire enhanced gas-solid separation dust removal system is less than 100 Pa (and can be below 0 Pa), thus negligible impact of the diversion flue on the resistance of the air-to-flue system. Furthermore, the enhanced gas-solid separation dust removal system provided in this embodiment is suitable for both newly built and existing units, particularly for π-type coal-fired boilers, and has broad application prospects.

[0041] It should be noted that the ash discharge frequency of the ash hopper 50, the pressure of the backflushing device 40, and the purging time can be optimized according to the actual unit load and the ash content of the coal, effectively avoiding clogging of the metal mesh assembly 31 and maintaining the best overall dust removal efficiency. In this embodiment, the enhanced gas-solid separation dust removal system is applied to the upstream flue of the SCR reactor. In other embodiments, the enhanced gas-solid separation dust removal system can also be applied to all turning flues in the tail flue of the coal-fired boiler, including but not limited to the economizer outlet to the denitrification horizontal flue 11, the denitrification horizontal flue 11 to the vertical flue 12, the denitrification outlet to the air preheater inlet flue, and the air preheater outlet to the low-temperature economizer flue, etc.

[0042] Furthermore, the flue expansion structure also includes an irregularly shaped corner flue 22. The inner wall of the irregularly shaped corner flue 22 is directly opposite to the inner wall of the expansion flue 21. One end of the irregularly shaped corner flue 22 is connected to the inner wall of the horizontal flue 11, and the other end of the irregularly shaped corner flue 22 is connected to the inner wall of the vertical flue 12. The expansion flue 21 and the irregularly shaped corner flue 22 are connected between the horizontal flue 11 and the vertical flue 12 to form a flue with multiple corners, which guides the flue gas flow to the dust collection device 30 and increases the dust removal efficiency of the dust collection device 30.

[0043] Optionally, to reduce flue gas turbulence and flow resistance, an arc-shaped guide plate 131 is provided at the first flue 13. The arc-shaped guide plate 131 bends toward the ash hopper 50, effectively guiding the dust-laden flue gas to the outside of the expansion flue 21, and guiding the flue gas to the space between the ash collection device 30 and the ash hopper 50, so that the flue gas must pass through the metal mesh assembly 31, ensuring an increase in dust removal efficiency.

[0044] Furthermore, the number of arc-shaped guide plates 131 is at least two, with each pair of arc-shaped guide plates 131 forming a group. Each group of arc-shaped guide plates 131 is spaced apart along its extension direction, allowing accumulated ash to fall between the two arc-shaped guide plates and eliminating the impact of ash accumulation. In this embodiment, the number of arc-shaped guide plates 131 is four. In other embodiments, the number of arc-shaped guide plates 131 can be two, six, or eight, etc. It should be noted that, to avoid the arc-shaped guide plates 131 themselves obstructing the flow of flue gas, the number of arc-shaped guide plates 131 should not be too large.

[0045] Optionally, to reduce flue gas turbulence and flow resistance, a straight guide plate 111 is also provided at the horizontal flue 11. The straight guide plate 111 is inclined along the axis of the horizontal flue 11 in a direction away from the vertical flue 12, which regulates the flue gas flow trajectory, reduces turbulence, and reduces the flow resistance of the flue gas. This avoids the reduction in dust removal efficiency caused by flue gas impact or eddies, ensures the smooth passage of flue gas, and improves the subsequent dust removal effect.

[0046] Furthermore, the number of straight guide vanes 111 is at least two, and the at least two straight guide vanes 111 are spaced apart along a direction perpendicular to the axis of the first flue 13. This further refines the flue gas flow path, disperses the airflow, more efficiently reduces turbulence and flow resistance, avoids the formation of local eddies, ensures uniform and stable flow of flue gas within the flue, and assists in the stable operation of the subsequent dust removal system. In this embodiment, the number of straight guide vanes 111 is two. In other embodiments, the number of straight guide vanes 111 can also be three, four, or five, etc. It should be noted that, in order to avoid the straight guide vanes 111 themselves obstructing the flow of flue gas, the number of straight guide vanes 111 should not be too large.

[0047] Optionally, the metal mesh assembly 31 includes a first metal mesh 311, a second metal mesh 312, and a third metal mesh 313. The first metal mesh 311, the second metal mesh 312, and the third metal mesh 313 are arranged sequentially and at intervals along the flue gas flow direction, and are composed of multiple layers of wire mesh with different mesh sizes to filter different flue gas dust particles. It should be noted that the metal mesh assembly 31 can be configured with appropriate mesh sizes based on the ash particle size ratio of the target boiler. In this embodiment, the first layer of metal mesh is a coarse mesh, serving an anti-wear function; the second layer of metal mesh is a fine mesh, serving a coarse filtration function; and the third layer of metal mesh is a woven metal mesh, serving a primary ash-collecting function.

[0048] Furthermore, the dust collection device 30 also includes a baffle plate 32. Along the flow direction of the flue gas, the baffle plate 32 is located upstream of the first metal mesh 311, so that the flue gas containing high concentration of dust particles collides and slows down in the baffle plate 32, effectively reducing the dust scouring ability and extending the service life of the metal mesh assembly 31.

[0049] Optionally, the enhanced gas-solid separation dust removal system also includes a compressed air source 60. The outlet of the compressed air source 60 is connected to the inlet of the back-flushing device 40. The compressed air source 60 delivers high-pressure airflow to the back-flushing device 40. The airflow impacts the surfaces of the baffle plate 32 and the metal mesh assembly 31, effectively removing the attached dust, restoring the filtration capacity of the metal mesh assembly 31, preventing the second metal mesh 312 and the third metal mesh 313 from becoming clogged and causing an increase in system resistance, and ensuring the continuous and stable operation of the enhanced gas-solid separation dust removal system.

[0050] Optionally, the enhanced gas-solid separation dust removal system also includes a dust collection device 70 and a silo pump 80. The inlet of the silo pump 80 is connected to the outlet of the dust hopper 50, the inlet of the dust collection device 70 is connected to the outlet of the silo pump 80, and the silo pump 80 is connected to the outlet of the compressed air source 60, forming a complete dust treatment process of "dust collection in the dust hopper 50 - receiving by the silo pump 80 - power provided by the compressed air source 60 - conveying by the silo pump 80 - collection by the dust collection device 70". This achieves efficient collection, stable conveying and centralized treatment of dust particles, avoids dust leakage or accumulation, and ensures the continuous and reliable operation of the enhanced gas-solid separation dust removal system.

[0051] like Figure 3 As shown, the design and installation steps of the enhanced gas-solid separation dust removal system are as follows:

[0052] S1, obtain the flue gas inlet velocity distribution and investigate the physical space of the site;

[0053] S2, designed with a new type of "V-shaped" expansion flue 21;

[0054] S3, optimize the setting of arc-shaped guide plate 131 and straight guide plate 111 to form a high-concentration dust particle area on the outside of the expanded flue 21;

[0055] S4, Arrange the ash collection device 30 in the high-concentration ash particle size area and determine the appropriate size of the baffle 32;

[0056] S5, check the system flue gas resistance. If it meets the requirements, proceed to step 6. If it does not meet the requirements, repeat steps S3-S5.

[0057] S6 is equipped with a dust hopper 50, a silo pump 80, a compressed air source 60, and a dust collection device 70.

[0058] The working process and principle of the enhanced gas-solid separation dust removal system provided in this embodiment are as follows:

[0059] Pre-dust removal of flue gas is achieved through a turning flue connecting the horizontal flue 11 to the vertical flue 12 in the boiler denitrification process. Both the height of the horizontal flue 11 and the depth of the vertical flue 12 are 2.7 meters. The flue gas velocity distribution in the horizontal flue 11 is obtained through numerical simulation and on-site testing. Based on the physical space and flue gas velocity distribution, part of the horizontal flue 11 is modified into a downward-sloping flue (i.e., the first flue 13), and the original turning flue height (or depth) is extended from 2.7 meters to over 4 meters, forming a novel "V-shaped" expanded flue 21. Physical space is added outside the turning flue to accommodate a high-efficiency ash-collecting device 30. Utilizing the novel "V-shaped" expanded flue 21, the flue gas velocity is reduced, enhancing the gas-solid two-phase separation. Dust particles in the flue gas significantly accumulate outside the flue, forming a high-concentration dust particle zone.

[0060] To reduce flue gas turbulence and flow resistance, two straight guide vanes 111 are added at the horizontal flue 11, and four arc-shaped guide vanes 131 are added at the new "V-shaped" expansion flue 21. At the same time, the original 90° turn inside the turning flue is transformed into a polygonal irregular-shaped turn flue 22.

[0061] like Figure 4 As shown, a suitable high-efficiency dust collection device 30 with a height of 800-1600mm is arranged at a suitable position on the outside of the new "V-shaped" expansion flue 21. According to numerical simulation analysis, the dust particles flowing through the dust collection device 30 account for 44.3% of the total number of particles. The high-efficiency dust collection device 30 is composed of a baffle plate 32 and a metal mesh assembly 31. After the flue gas containing high concentrations of dust particles collides and slows down in the upstream baffle plate 32, some dust particles fall directly into the lower ash hopper 50; some dust particles are filtered and collected by the downstream metal mesh assembly 31, and then blown into the lower ash hopper 50 by the compressed air back-blowing device 40; the comprehensive dust removal efficiency of the single-point turning flue dust collection device 30 can reach 15%; the dust particles in the ash hopper 50 are transported to the dust collection device 70 by the hopper pump 80. By using the "expanded flue design 21 + enhanced gas-solid separation + high-efficiency ash removal device 30", the dust removal system with enhanced gas-solid separation provided in this embodiment can remove 6% of the coal ash in a single turning flue from the horizontal flue 11 to the vertical flue 12 of the boiler denitrification system.

[0062] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A dust removal system for enhanced gas-solid separation, characterized in that, The enhanced gas-solid separation dust removal system is applied at the turning flue where the horizontal flue (11) and the vertical flue (12) connect. The enhanced gas-solid separation dust removal system includes: The flue expansion structure includes an expansion flue (21), one end of which is connected to the horizontal flue (11) via a first flue (13), and the other end of which is connected to the vertical flue (12) via a second flue (14). The axis of the first flue (13) is inclined along the axis of the horizontal flue (11) in a direction away from the vertical flue (12), and the axis of the second flue (14) is inclined along the axis of the vertical flue (12) in a direction away from the horizontal flue (11). Ash collection device (30) is located at the connection between the second flue (14) and the expansion flue (21). The ash collection device (30) includes a metal mesh assembly (31), the working surface of which is perpendicular to the flow direction of the flue gas. A back-blowing device (40) is located downstream of the ash-collecting device (30) along the flow direction of the flue gas, and the air outlet of the back-blowing device (40) is directly opposite the ash-collecting device (30). Ash hopper (50) is located at the lower end of the working surface of the metal mesh assembly (31).

2. The enhanced gas-solid separation dust removal system according to claim 1, characterized in that, An arc-shaped guide plate (131) is provided at the first flue (13), and the arc-shaped guide plate (131) is bent toward the ash hopper (50).

3. The enhanced gas-solid separation dust removal system according to claim 2, characterized in that, The number of the arc-shaped guide vanes (131) is at least two, and each pair of arc-shaped guide vanes (131) forms a group. Each group of arc-shaped guide vanes (131) is spaced apart along its extension direction.

4. The enhanced gas-solid separation dust removal system according to claim 3, characterized in that, A straight guide plate (111) is provided at the horizontal flue (11), and the straight guide plate (111) is inclined along the axis of the horizontal flue (11) in a direction away from the vertical flue (12).

5. The enhanced gas-solid separation dust removal system according to claim 4, characterized in that, The number of the straight guide plates (111) is at least two, and the at least two straight guide plates (111) are spaced apart in a direction perpendicular to the axis of the first flue (13).

6. The enhanced gas-solid separation dust removal system according to claim 1, characterized in that, The metal mesh assembly (31) includes a first metal mesh (311), a second metal mesh (312), and a third metal mesh (313), which are arranged sequentially at intervals along the flow direction of the flue gas.

7. The enhanced gas-solid separation dust removal system according to claim 6, characterized in that, The ash collection device (30) further includes a baffle plate (32), which is located upstream of the first metal mesh (311) along the flow direction of the flue gas.

8. The enhanced gas-solid separation dust removal system according to claim 1, characterized in that, The enhanced gas-solid separation dust removal system also includes a compressed air source (60), the outlet of which is connected to the inlet of the backflushing device (40).

9. The enhanced gas-solid separation dust removal system according to claim 8, characterized in that, The enhanced gas-solid separation dust removal system further includes a dust collection device (70) and a silo pump (80). The inlet of the silo pump (80) is connected to the outlet of the ash hopper (50), the inlet of the dust collection device (70) is connected to the outlet of the silo pump (80), and the silo pump (80) is connected to the outlet of the compressed air source (60).

10. The enhanced gas-solid separation dust removal system according to any one of claims 1-9, characterized in that, The flue expansion structure also includes an irregular corner flue (22), the inner wall of which is directly opposite to the inner wall of the expansion flue (21), one end of which is connected to the inner wall of the horizontal flue (11), and the other end of which is connected to the inner wall of the vertical flue (12).

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