Boiler combustion stability enhancing device capable of preventing coal accumulation

Abstract

The invention provides a boiler combustion stability enhancing device capable of preventing coal accumulation, belongs to the technical field of boiler combustion, and can at least partially solve the problems that after a separation part of an existing boiler combustion stability enhancing device runs for a long time, serious coal accumulation is likely to occur on the two sides due to pulverized coal humidity, viscosity and airflow disturbance, pulverized coal airflow is hindered from flowing along a preset path, and the combustion stability of a boiler is influenced. In order to solve the problems of fuzzy boundary of primary air pulverized coal dense-thin separation, reduction of pulverized coal concentration in a dense-phase region, increase of pulverized coal entrainment in a light-phase region and significant reduction of separation precision in the prior art, the invention comprises a shell, a cleaning assembly and a sealing assembly, and is provided with the cleaning assembly which can drive a screw rod to rotate through a driving part rotating handle, so that the cleaning action can be completed in a linkage manner; complex manual intervention is not needed, accumulated coal is cleared away in time, the cleaning action is in linkage fit with angle adjustment of the screw, the cleaning assembly is always kept in a stable working state when the angle changes, and stable operation of the device under different working conditions is effectively guaranteed.

Description

Technical Field

[0001] This invention belongs to the field of boiler combustion technology, and specifically relates to a boiler combustion stability enhancement device to prevent coal accumulation. Background Technology

[0002] With the expansion of new energy grid connection, thermal power plants need to frequently switch between 30% and 100% rated load. During wide-load peak shaving, boilers face combustion stability challenges: at low loads, the primary air pulverized coal concentration is low and the furnace heat load is insufficient, easily leading to flame instability and requiring the addition of auxiliary fuels; at high loads, the airflow velocity is fast, easily leading to localized oxygen-rich combustion, causing furnace overheating and NO emissions. x Exceeding the standard, and the clumping of pulverized coal in the channel will further disrupt the uniformity of concentration.

[0003] Existing stable combustion technologies in the industry suffer from poor adaptability and limited temperature control, making it difficult to overcome bottlenecks. In contrast, the concentrated-lean pulverized coal burner utilizes the combined effect of inertial and centrifugal forces to separate the pulverized coal airflow into two streams: a concentrated stream at low loads ignites rapidly due to its high concentration, forming a stable core flame without the need for additional combustion aids; and a lean stream mixes precisely with staged secondary air at high loads, controlling the furnace temperature. Furthermore, by adjusting the concentrated-lean ratio, it adapts to different loads, becoming a key device for ensuring stable combustion across a wide range of boiler loads.

[0004] In existing boiler combustion stability enhancement devices, after long-term operation, the core separation components (such as baffles) are prone to severe coal accumulation on both sides due to the moisture and viscosity of pulverized coal and airflow disturbances. This coal accumulation alters the flow field morphology on the baffle surface, hindering the flow of pulverized coal along the preset path. This leads to blurred boundaries between the primary air and pulverized coal concentrations, a decrease in pulverized coal concentration in the dense phase zone, an increase in pulverized coal entrainment in the desiccant zone, and a significant decrease in separation accuracy. This not only weakens the device's adaptability to wide boiler load conditions but may also cause local combustion fluctuations due to uneven airflow distribution, further affecting boiler combustion stability and operating efficiency. Therefore, we propose a boiler combustion stability enhancement device to prevent coal accumulation. Summary of the Invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art, and to provide a device for enhancing the combustion stability of boilers to prevent coal accumulation.

[0006] This invention provides a boiler combustion stability enhancement device to prevent coal accumulation, comprising: The housing has ports at both ends for connecting to pulverized coal pipelines during operation, and a pulverized coal discharge port on one side of the housing. A cleaning assembly includes a partition plate disposed inside the housing and a cleaning mechanism disposed on the partition plate. The cleaning mechanism includes scraper assemblies disposed opposite each other on two sides of the partition plate and a drive assembly disposed on the housing for driving the scraper assemblies during operation. The sealing assembly includes a mounting plate disposed at one end of the partition plate and a corrugated plate connected to the mounting plate, wherein one end of the corrugated plate is connected to the inner wall of the powder discharge port side of the housing.

[0007] Furthermore, the boiler combustion stability enhancement device also includes an angle adjustment component, which includes an arc-shaped plate connected to one side of the partition plate. The arc-shaped plate passes through the housing and extends to the outside of the housing. The housing is provided with the drive component at the corresponding position of the arc-shaped plate.

[0008] Specifically, the drive assembly includes a plurality of toothed blocks disposed on the arc-shaped plate, a gear disposed on the side wall of the housing and meshing with the toothed blocks, and a drive member connected to the gear. The output end of the drive member is connected to the gear to rotate the gear and drive the arc-shaped plate to rotate.

[0009] Specifically, the driving component is a drive motor, and the housing is provided with an arc-shaped sliding hole at the protrusion position of the arc-shaped plate, and a sealing ring is provided inside the arc-shaped sliding hole.

[0010] Preferably, the partition plate has limit blocks on both sides opposite to the end of the arc-shaped plate, and the inner wall of the housing has a limit groove for the limit blocks to slide.

[0011] Specifically, the partition plate is hollow inside and a screw is disposed inside the partition plate. One end of the screw passes through the partition plate and the housing and is connected to a rotating handle outside the housing. The other end of the screw is connected to the inner wall of the partition plate for rotation relative to the inner wall of the partition plate during operation. The drive assembly includes the screw and the rotating handle.

[0012] Furthermore, a magnetic block is threadedly engaged on the outer periphery of the screw, and guide rods are provided on both sides of the screw inside the partition plate.

[0013] Furthermore, a sealed bearing is provided at the contact position between the screw and the housing.

[0014] Furthermore, the magnetic block is a neodymium iron boron magnetic block.

[0015] Specifically, the cleaning assembly includes a magnetic plate disposed on the surface of the partition plate, scrapers disposed on both sides of the magnetic plate and attached to the surface of the partition plate, and guide rails disposed at both ends of the magnetic plate. A limiting plate is provided on the surface of the partition plate at the corresponding position of the guide rail. The limiting plate has a groove on the side facing the magnetic plate for the guide rail to slide. The magnetic plate is a neodymium iron boron magnetic plate.

[0016] The beneficial effects of this invention are as follows: The device is equipped with a cleaning component that drives the screw to rotate via a drive handle, thus completing the cleaning action in a synchronized manner without complex manual intervention. This ensures timely removal of accumulated coal, and the cleaning action is synchronized with the screw angle adjustment. The cleaning component maintains a stable working state regardless of angle changes, effectively guaranteeing stable operation of the device under various working conditions. Through a sealing component, adjusting the angle of the partition plate synchronously moves the mounting plate, and the stretching or compression of the corrugated plate maintains a reliable seal between the lower end of the partition plate and the shell. This effectively prevents concentrated coal powder from seeping from below the partition plate and mixing with the diluted coal powder above, ensuring accurate separation of concentrated and diluted coal. Furthermore, the sealing action automatically adapts to angle adjustments, enhancing the operational stability of the device. Attached Figure Description

[0017] Figure 1 This is a front sectional view of a boiler combustion stability enhancement device for preventing coal accumulation, according to a specific embodiment of the present invention. Figure 2 This is a schematic diagram showing the connection between the partition plate and the magnetic plate of a boiler combustion stability enhancement device for preventing coal accumulation, according to a specific embodiment of the present invention. Figure 3 This is a top cross-sectional view of the partition plate of a boiler combustion stability enhancement device for preventing coal accumulation, according to a specific embodiment of the present invention. Figure 4 This is a front view of a boiler combustion stability enhancement device for preventing coal accumulation, according to a specific embodiment of the present invention.

[0018] The components include: 1. housing; 2. partition plate; 3. screw; 4. magnetic block; 5. guide rod. 6. Sealing assembly; 601. Mounting plate; 602. Corrugated plate; 7 magnetic plates; 8. Angle adjustment assembly; 801. Drive component; 802. Gear; 803. Arc-shaped sliding hole; 804. Arc plate; 805. Gear block; 9. Rotary handle; 10. Scraper; 11. Limiting plate. Detailed Implementation

[0019] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] like Figure 1 , Figure 2 As shown in the figure, a boiler combustion stability enhancement device for preventing coal accumulation is provided by a specific embodiment of the present invention, comprising: The housing 1 has ports at both ends for connecting to pulverized coal pipelines during operation, and a discharge port on one side for discharging and recycling the pulverized coal accumulated inside the housing 1; a cleaning assembly includes a partition plate 2 disposed inside the housing 1 and a cleaning mechanism disposed on the partition plate 2 for cleaning the surface of the partition plate 2, the cleaning mechanism including scraper assemblies disposed opposite to the two sides of the partition plate 2 and a drive assembly disposed on the housing 1 for driving the scraper assemblies during operation; and a sealing assembly 6, including a mounting plate 601 disposed at one end of the partition plate 2 and a corrugated plate 602 connected to the mounting plate 601, one end of the corrugated plate 602 being connected to the inner wall of the discharge port side of the housing 1.

[0021] Specifically, the function of the casing 1 is to form an independent pulverized coal airflow channel, with both ends connected to the existing pulverized coal pipeline via ports, allowing the device to be inserted as a whole into the primary air pulverized coal pipeline. The interior of the casing 1 provides installation space and support positions for the partition plate 2, cleaning components, and sealing components. At the same time, pulverized coal discharge ports are provided on the side walls to collect, discharge, and recycle the pulverized coal accumulated inside the device, especially below and around the partition plate 2, to prevent long-term ash accumulation from affecting the flow field and safety.

[0022] Furthermore, the cleaning component cleans the surface of the partition plate 2 inside the shell 1. The partition plate 2 is responsible for diverting the pulverized coal gas flow and separating the concentrated and dilute phases. Once coal clumps on its surface, the diversion boundary becomes blunt or even obscured, leading to a decrease in the pulverized coal concentration in the concentrated phase zone and an increase in the entrainment in the dilute phase zone, thus disrupting the original concentration-dilute separation effect. By installing scraper assemblies on both sides of the partition plate 2 and a drive assembly on the outside of the shell 1, the scraper 10 can be driven to slide back and forth along the surface of the partition plate 2 at any time without shutting down the furnace, scraping off the attached and accumulated pulverized coal, keeping the working surface of the partition plate 2 clean and flat, thereby maintaining a stable gas-solid two-phase flow distribution.

[0023] Furthermore, the sealing component seals the gap between one end of the partition plate 2 and the inner wall of the housing 1, preventing pulverized coal and primary air from bypassing the bottom or lower side of the partition plate. By setting an mounting plate 601 at one end of the partition plate 2, and then connecting the mounting plate 601 to the corrugated plate 602, and fixing the other end of the corrugated plate 602 to the inner wall of the pulverized coal discharge port of the housing 1, a flexible sealing area that expands and contracts with the movement of the partition plate 2 can be formed at that end. On the one hand, it blocks concentrated pulverized coal from entering the airflow on the other side from the bottom of the partition plate 2, ensuring the accuracy of the separation of concentrated and diluted coal; on the other hand, it guides the pulverized coal falling into the sealing area to the cavity where the pulverized coal discharge port is located, facilitating centralized discharge and recycling. The corrugated plate 602 is equivalent to a flexible sealing element with elastic stroke. Compared with a rigid baffle, the corrugated plate 602 can automatically stretch or compress with the slight up and down displacement of one end of the partition plate 2 during the angle adjustment of the partition plate 2, compensating for the relative displacement of the partition plate 2 relative to the housing 1 without damaging the overall seal. This design allows for angle adjustment of the partition plate 2 while maintaining a continuous seal between the end of the partition plate 2 and the inner wall of the housing 1, preventing significant gaps that could lead to air and dust leakage. The corrugated structure itself also provides cushioning and vibration absorption, absorbing the impact of coal dust airflow and small vibrations generated during equipment operation, reducing stress on the sealing parts and extending the seal life. Simultaneously, the space formed between the corrugated plate 602 and the inner wall of the discharge port side of the housing 1 serves as a coal accumulation buffer zone, collecting coal dust that has been scraped off or naturally settled below the partition plate 2 and then discharging it uniformly through the discharge port, preventing this portion of coal dust from being re-introduced into the separation zone by the main airflow and disrupting the concentration distribution.

[0024] Based on the above basic implementation method, such as Figure 3 , Figure 4 As shown, the boiler combustion stability enhancement device also includes an angle adjustment component. The baffle angle adjustment component includes an arc plate 804 connected to one side of the baffle plate 2. The arc plate 804 passes through the housing 1 and extends to the outside of the housing 1. The housing 1 is provided with a drive component at the corresponding position of the arc plate 804.

[0025] Specifically, the fundamental function of the angle adjustment component is to adjust the tilt angle of the partition plate 2 relative to the pulverized coal airflow direction, thereby changing the distribution ratio of the pulverized coal airflow on both sides of the partition plate 2 and achieving adjustable diversion of the rich and lean flow. For boilers operating under wide loads, the primary air volume and pulverized coal volume vary greatly between 30% and full load, and the combustion stability requirements also change accordingly. At low boiler loads, appropriately increasing the tilt angle of the partition plate 2 relatively reduces the cross-sectional area of ​​the channel on the rich phase side, increases the flow velocity and pulverized coal concentration, which is conducive to forming a high-concentration, strong ignition core flame in the burner area and enhances stable combustion capability. At high loads, the tilt angle of the partition plate 2 is reduced to make the flow rate and pulverized coal concentration on both sides tend to be balanced, which is conducive to reducing local overheating in the furnace and suppressing the formation of nitrogen oxides. The angle adjustment component allows this diversion characteristic to be continuously or stepwise adjusted according to the load and operating conditions, improving the adaptability of the unit to wide load conditions.

[0026] In one specific embodiment, the drive assembly includes a plurality of toothed blocks 805 disposed on the arc plate 804, a gear 802 disposed on the side wall of the housing 1 and meshing with the toothed blocks 805, and a drive member 801 connected to the gear 802. The output end of the drive member 801 is connected to the gear to rotate the gear 802 to drive the arc plate 804 to rotate.

[0027] In this embodiment, the driving component 801 is a driving motor, and the housing 1 is provided with an arc-shaped sliding hole 803 at the protrusion position of the arc-shaped plate 804. A sealing ring is provided in the arc-shaped sliding hole 803. Limiting blocks are provided on both sides of the partition plate 2 away from the arc-shaped plate 804, and a limiting groove is provided on the inner wall surface of the housing 1 for the limiting blocks to slide.

[0028] Furthermore, during angle adjustment, the drive component 801 drives the gear 802 to rotate, and the gear 802 meshes with multiple toothed blocks 805 arranged on the arc-shaped plate 804. When the gear 805 rotates, it drives the arc-shaped plate 804 to rotate along the arc-shaped trajectory on the outside of the housing 1. One side of the arc-shaped plate 804 is connected to the partition plate 2, so when the arc-shaped plate 804 rotates around the axis near the partition plate 2, the partition plate 2 rotates synchronously relative to the housing 1, thereby changing the angle between the partition plate 2 and the airflow direction. The limiting blocks on both sides of the end of the partition plate 2 away from the arc-shaped plate 804 slide in the limiting groove on the inner wall of the housing 1, guiding and constraining the rotation trajectory of the partition plate 2, preventing the end of the partition plate 2 from shaking or shifting during the adjustment process. At the same time, the mounting plate 601 at one end of the partition plate 2 undergoes a slight displacement as the partition plate 2 rotates, and the mounting plate 601 drives the corrugated plate 602 to stretch or compress accordingly, so that the sealing assembly always fits against the inner wall of the housing 1, ensuring continuous and reliable sealing at the end of the partition plate 2 during the angle adjustment process. By using gear 802 to drive the arc-shaped plate 804, the angle of the partition plate 2 can be controlled relatively precisely, supporting both automatic adjustment and easy repeatable positioning of the preset angle. The arc-shaped sliding hole 803 serves two purposes: First, it provides a motion channel for the arc-shaped plate 804 to match its rotation trajectory. The arc-shaped plate 804 is connected to the partition plate 2. When the partition plate 2 needs to change its tilt angle, the arc-shaped plate 804 rotates in an arc relative to the housing 1. The shape and position of the arc-shaped sliding hole 803 on the housing 1 are consistent with the motion trajectory of the arc-shaped plate 804, ensuring that the arc-shaped plate 804 always passes through the wall of the housing 1 along the predetermined arc during adjustment, without interfering with the housing 1 or causing additional jamming, thus ensuring smooth and reliable angle adjustment. Second, it works with the sealing ring to form a follow-up seal in the moving parts, maintaining the sealing performance of the housing 1. A sealing ring is provided inside the arc-shaped sliding hole 803, which fits against the outer surface of the arc-shaped plate 804 and maintains a certain preload during assembly. When the arc-shaped plate 804 rotates within the arc-shaped sliding hole 803, the sealing ring always tightly grips the outer circumference of the arc-shaped plate 804, forming a continuous circumferential contact surface. This prevents primary air and pulverized coal from leaking out of the shell through the gap in the sliding hole throughout the entire adjustment stroke. The sealing ring itself has a certain degree of elasticity, which can automatically compensate for minor offsets and wear generated during the rotation of the arc-shaped plate 804, ensuring a stable fit between the contact surfaces and preventing significant leakage gaps. The arc-shaped sliding hole 803 limits the movement path of the arc-shaped plate 804, and the sealing ring within the hole provides a sliding seal at the protrusion position. This ensures that throughout the entire angle adjustment of the partition plate 2, the opening on the wall of the shell 1 meets the movement requirements of the arc-shaped plate 804 while maintaining good airtightness and pulverized coal sealing performance, thus preventing damage to the overall seal of the pulverized coal pipeline due to angle adjustment.

[0029] In another specific embodiment, the partition plate 2 is hollow inside and a screw 3 is provided inside the partition plate 2. One end of the screw 3 passes through the partition plate 2 and the housing 1 and is connected to the handle 9 outside the housing 1. The other end of the screw 3 is connected to the inner wall of the partition plate 2 for rotation relative to the inner wall of the partition plate 2 during operation. The driving component includes the screw 3 and the handle 9. The handle 9 can be replaced by a driving component to achieve automatic cleaning.

[0030] Specifically, the partition plate 2 is hollow inside. On the one hand, this provides installation space for internal transmission and magnetic coupling components such as the screw 3, magnetic block, and guide rod 5, allowing these components to be completely located inside the partition plate, avoiding direct exposure to the high-speed dust-laden airflow, thereby reducing the risk of wear and blockage and improving reliability and lifespan. On the other hand, the hollow structure reduces the weight of the partition plate 2 while maintaining rigidity, reducing the driving torque requirement of the angle adjustment component and facilitating the smooth rotation of the partition plate 2 inside the housing 1. By arranging the screw 3 and magnetic block 4 inside the hollow cavity, and utilizing the magnetic force between the magnetic block 4 and the external magnetic plate, the internal spiral motion can be converted into the linear reciprocating motion of the external scraper along the surface of the partition plate 2 without compromising the overall sealing of the housing 1 and the partition plate 2.

[0031] In one specific embodiment, a magnetic block 4 is threadedly engaged on the outer periphery of the screw 3, and guide rods 5 are provided on both sides of the screw 3 inside the partition plate 2; a sealed bearing is provided at the contact position between the screw 3 and the housing 1; the magnetic block 4 is a neodymium iron boron magnetic block.

[0032] In this embodiment, the sealed bearing is located at the contact position between the screw 3 and the housing 1, serving two purposes: First, it forms a rotational support where the screw 3 exits the housing 1, allowing the screw 3 to rotate smoothly and steadily under the drive of the handle 9, reducing frictional resistance and vibration. Second, it achieves airtightness and pulverized coal sealing at the exit position, preventing primary air and pulverized coal from leaking from the inside of the housing 1 to the external environment along the screw axis, ensuring the sealing safety and flow field stability of the pipeline system.

[0033] Specifically, the magnetic block 4 is threaded onto the outer periphery of the screw 3 and moves axially along the interior of the partition plate 2 when the screw 3 rotates. The magnetic block 4 uses neodymium iron boron magnets to obtain a strong and stable magnetic field strength, enabling it to reliably attract and drive the magnetic plate on the surface of the partition plate 2 through the wall thickness of the partition plate 2. Through the magnetic coupling between the magnetic block 4 and the magnetic plate 7, a non-rigid connection is achieved between the inside and outside of the partition plate 2, avoiding the use of through-plate connecting rods or guide rods that would compromise the airtightness of the partition plate. At the same time, it reduces the obstruction and wear of the pulverized coal airflow by the transmission components. The guide rod 5 passes through the magnetic block 4 to ensure the movement stability of the magnetic block 4.

[0034] In another specific embodiment, the cleaning component includes a magnetic plate 7 disposed on the surface of the partition plate 2, scrapers 10 disposed on both sides of the magnetic plate 7 and attached to the surface of the partition plate 2, and guide rails disposed at both ends of the magnetic plate 7. A limiting plate is provided on the surface of the partition plate 2 at the corresponding position of the guide rail. The limiting plate has a groove for the guide rail to slide on the side facing the magnetic plate 7. The magnetic plate 7 is a neodymium iron boron magnetic plate.

[0035] Furthermore, when the cleaning component is in operation, the operator rotates the handle 9 on the outside of the housing 1. The handle 9 drives the screw 3, which passes through the partition plate 2 and is rotatably connected to its inner wall, to rotate. The magnetic block 4 on the outer periphery of the screw 3 engages with the thread. Under the action of the screw pair, the magnetic block 4 moves linearly along the axial direction of the screw 3 inside the partition plate 2. The magnetic plate 7, which is set at the corresponding position on the surface of the partition plate 2, is attracted by the magnetic force of the magnetic block 4 and moves synchronously with the magnetic block 4. The scrapers 10 set on both sides of the magnetic plate 7 are attached to the two side surfaces of the partition plate 2. When the magnetic plate 7 moves, the scrapers 10 slide along the surface of the partition plate 2, continuously scraping away the coal powder and lumps attached to the surface of the partition plate 2, causing them to fall off the surface of the partition plate 2 and fall into the coal accumulation area at the bottom of the housing 1 or near the sealing component under the action of gravity and airflow. The guide strips at both ends of the magnetic plate 7 slide in the grooves on the limiting plate 11 on the surface of the partition plate 2, guiding the movement trajectory of the magnetic plate 7 and the scraper 10, ensuring that the scraper 10 moves parallel to the surface of the partition plate 2 along a predetermined path, and avoiding deviation or lifting that would result in incomplete cleaning in certain areas.

[0036] Furthermore, the cleaning process can be performed intermittently as needed, or it can be automated or timed with the help of an external drive mechanism. Since the magnetic coupling structure does not require through holes in the separator plate 2, the cleaning action will not damage the overall strength and sealing of the separator plate 2, and will not interfere with the operation of the angle adjustment component. Thus, while ensuring the accuracy of coal powder airflow distribution, the surface of the separator plate 2 is kept clean for a long time, preventing the degradation of the concentration-to-lean separation performance caused by coal accumulation.

[0037] To aid in a better understanding of the invention, a more comprehensive and specific embodiment is described, in which the invention provides a boiler combustion stability enhancement device for preventing coal accumulation, comprising: The housing 1 has ports at both ends for connecting to pulverized coal pipelines during operation, and a discharge port on one side for discharging and recycling the pulverized coal accumulated inside the housing 1; a cleaning assembly includes a partition plate 2 disposed inside the housing 1 and a cleaning component disposed on the partition plate 2 for cleaning the surface of the partition plate 2, the cleaning component includes scraper assemblies disposed opposite to the two sides of the partition plate 2 and a drive assembly disposed on the housing 1 for driving the scraper assemblies during operation; and a sealing assembly 6 includes a mounting plate 601 disposed at one end of the partition plate 2 and a corrugated plate 602 connected to the mounting plate 601, one end of the corrugated plate 602 being connected to the inner wall of the discharge port side of the housing 1.

[0038] In this embodiment, the boiler combustion stability enhancement device further includes an angle adjustment assembly 8. This assembly includes an arc-shaped plate 804 connected to one side of the partition plate 2. The arc-shaped plate 804 penetrates the housing 1 and extends to the outer side of the housing 1. A drive assembly is provided at a corresponding position on the arc-shaped plate 804 in the housing 1. The drive assembly includes multiple toothed blocks 805 disposed on the arc-shaped plate 804, a gear 802 disposed on the side wall of the housing 1 and meshing with the toothed blocks 805, and a drive member 801 connected to the gear 802. The output end of the drive member 801 is connected to the gear 802 to rotate the gear 802, thereby rotating the arc-shaped plate 804. The drive member 801 is a drive motor. An arc-shaped sliding hole 8 is provided at the protrusion position of the arc-shaped plate 804 in the housing 1. 03. A sealing ring is provided inside the arc-shaped sliding hole 803; limit blocks are provided on both sides of the end of the partition plate 2 away from the arc-shaped plate 804, and a limit groove is opened on the inner wall of the housing 1 for the limit blocks to slide; the partition plate 2 is hollow inside and a screw 3 is provided inside the partition plate 2. One end of the screw 3 passes through the partition plate 2 and the housing 1 and is connected to the rotating handle 9 outside the housing 1. The other end of the screw 3 is connected to the inner wall of the partition plate 2 for rotation relative to the inner wall of the partition plate 2 during operation. The driving assembly includes the screw 3 and the rotating handle 9; a magnetic block 4 is threaded on the outer periphery of the screw 3, and guide rods 5 are provided on both sides of the screw 3 inside the partition plate 2; a sealed bearing is provided at the contact position between the screw 3 and the housing 1; the magnetic block 4 is a neodymium iron boron magnet.

[0039] Specifically, the cleaning assembly includes a magnetic plate 7 disposed on the surface of the partition plate 2, scrapers 10 disposed on both sides of the magnetic plate 7 and attached to the surface of the partition plate 2, and guide rails disposed at both ends of the magnetic plate 7. A limiting plate 11 is provided on the surface of the partition plate 2 at the corresponding position of the guide rail. The limiting plate 11 has a groove on the side facing the magnetic plate 7 for the guide rail to slide. The magnetic plate 7 is a neodymium iron boron magnetic plate.

[0040] In summary, the embodiments disclosed herein have at least the following technical effects: By setting scraper assemblies on both sides of the partition plate 2 and using the internal screw of the partition plate 2 to drive the magnetic block 4 and magnetic plate 7 to move back and forth, the scraper 10 automatically scrapes off the attached coal powder along the surface of the partition plate 2, realizing online cleaning of the surface of the partition plate 2, effectively avoiding the passivation of the diversion boundary and the decrease in the accuracy of the concentration separation caused by coal accumulation and agglomeration, maintaining the stability of coal powder airflow distribution in the long term, and improving the combustion stability of the boiler under wide load operation. A pulverizing port is provided on one side of the shell 1, and together with the mounting plate 601 and corrugated plate 602 at the end of the partition plate 2, a sealed and expandable pulverizing space is formed. The pulverized coal that is scraped off or settled below the partition plate 2 is concentrated and guided into the pulverizing area and discharged for recycling, so as to prevent the accumulated coal from being re-entrained into the separation zone by the main airflow and disturbing the concentration distribution. At the same time, it reduces the amount of ash accumulated inside the shell 1 and reduces the amount of manual ash cleaning work. The sealing assembly 6 adopts a structure in which the corrugated plate 602 is connected to the inner wall of the shell 1. The corrugated plate 602 has both flexibility and sealing properties. It can be stretched or compressed during the angle adjustment of the partition plate 2 to compensate for the displacement change at the end of the partition plate 2. While allowing the partition plate 2 to rotate and adjust, it continuously blocks the coal powder and primary air from flowing around the bottom of the partition plate 2 to ensure effective isolation of the gas-solid two-phase flow on the rich and poor sides. The angle adjustment component 8 achieves precise adjustment of the tilt angle of the partition plate 2 through the meshing transmission of the arc plate 804, gear 802, and toothed block 805. Combined with the limiting groove and limiting block on the inner wall of the housing 1, it guides and constrains the rotation trajectory of the partition plate 2, ensuring stable operation of the partition plate 2 at different tilt angles. By changing the tilt angle of the partition plate 2, the distribution ratio of pulverized coal airflow on both sides can be flexibly adjusted. At low loads, it enhances the flow rate and concentration on the dense phase side to improve combustion stability; at high loads, it balances the dense and lean phases, which helps reduce local overheating in the furnace and nitrogen oxide emissions, significantly improving the adaptability of the unit to wide-load peak-shaving conditions. The partition plate 2 is hollow inside and is equipped with components such as screw 3, magnetic block 4 and guide rod 5. The transmission mechanism and magnetic coupling element are arranged inside the partition plate 2. This avoids the need to open a large number of through holes in the shell 1 and the partition plate 2, which would damage the overall seal. It also reduces the chance of the transmission components being directly exposed to the high temperature and dusty airflow, reducing the risk of wear and blockage. At the same time, it reduces the weight of the partition plate 2, reduces the driving torque required for angle adjustment, and improves operational reliability. A sealed bearing is installed where the screw 3 protrudes from the housing 1. This provides stable rotational support for the screw 3, reducing friction and vibration. Furthermore, it creates a reliable airtight and powder-free seal at the protrusion point, preventing primary air and coal dust from leaking along the screw axis to the outside of the housing 1, thus ensuring the sealing safety of the pipeline system. The magnetic blocks 4 on the outer periphery of the screw 3 are made of neodymium iron boron magnets. Through a strong magnetic field, they form a reliable magnetic coupling with the neodymium iron boron magnetic plate on the surface of the partition plate 2. This allows the internal spiral motion to be converted into the linear cleaning motion of the external scraper without the need for a rigid connecting rod to penetrate the partition plate 2, achieving non-contact power transmission. The structure is simple and the transmission is reliable. In the cleaning assembly, the guide rails at both ends of the magnetic plate 7, together with the limiting plate and groove on the surface of the partition plate 2, effectively limit the movement direction of the magnetic plate 7 and the scraper 10, ensuring that the scraper 10 always adheres to the surface of the partition plate 2 and moves back and forth along a predetermined path, avoiding skewness and lifting that would lead to cleaning dead corners, reducing wear on the guide components, making the cleaning process smooth and stable, and thus maintaining the efficient cleaning state of the surface of the partition plate 2 for a long time.

[0041] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of the present invention, and the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A boiler combustion stability enhancement device for preventing coal accumulation, characterized in that, include: The housing has ports at both ends for connecting to pulverized coal pipelines during operation, and a pulverized coal discharge port on one side of the housing. A cleaning assembly includes a partition plate disposed inside the housing and a cleaning mechanism disposed on the partition plate. The cleaning mechanism includes scraper assemblies disposed opposite to each other on both sides of the partition plate and a drive assembly disposed on the housing for driving the scraper assemblies during operation. as well as The sealing assembly includes a mounting plate disposed at one end of the partition plate and a corrugated plate connected to the mounting plate, wherein one end of the corrugated plate is connected to the inner wall of the powder discharge port side of the housing.

2. The boiler combustion stability enhancement device for preventing coal accumulation according to claim 1, characterized in that, The boiler combustion stability enhancement device further includes an angle adjustment component, which includes an arc-shaped plate connected to one side of the partition plate. The arc-shaped plate passes through the housing and extends to the outside of the housing. The housing is provided with the drive component at the corresponding position of the arc-shaped plate.

3. The boiler combustion stability enhancement device for preventing coal accumulation according to claim 2, characterized in that, The drive assembly includes a plurality of toothed blocks disposed on the arc-shaped plate, a gear disposed on the side wall of the housing and meshing with the toothed blocks, and a drive member connected to the gear. The output end of the drive member is connected to the gear to rotate the gear and drive the arc-shaped plate to rotate.

4. The boiler combustion stability enhancement device for preventing coal accumulation according to claim 3, characterized in that, The driving component is a drive motor, and the housing is provided with an arc-shaped sliding hole at the protrusion position of the arc-shaped plate, and a sealing ring is provided in the arc-shaped sliding hole.

5. The boiler combustion stability enhancement device for preventing coal accumulation according to claim 3, characterized in that, Limiting blocks are provided on both sides of the end of the partition plate away from the arc-shaped plate, and a limiting groove is provided on the inner wall of the shell for the limiting blocks to slide.

6. The boiler combustion stability enhancement device for preventing coal accumulation according to claim 1, characterized in that, The partition plate is hollow inside and a screw is installed inside the partition plate. One end of the screw passes through the partition plate and the housing and is connected to a rotating handle outside the housing. The other end of the screw is connected to the inner wall of the partition plate for rotation relative to the inner wall of the partition plate during operation. The drive assembly includes the screw and the rotating handle.

7. The boiler combustion stability enhancement device for preventing coal accumulation according to claim 6, characterized in that, The screw has a magnetic block threadedly engaged on its outer circumference, and guide rods are provided on both sides of the screw inside the partition plate.

8. The boiler combustion stability enhancement device for preventing coal accumulation according to claim 6, characterized in that, A sealed bearing is provided at the contact position between the screw and the housing.

9. The boiler combustion stability enhancement device for preventing coal accumulation according to claim 7, characterized in that, The magnetic block is a neodymium iron boron magnetic block.

10. The boiler combustion stability enhancement device for preventing coal accumulation according to any one of claims 1 to 9, characterized in that, The cleaning assembly includes a magnetic plate disposed on the surface of the partition plate, scrapers disposed on both sides of the magnetic plate and attached to the surface of the partition plate, and guide rails disposed at both ends of the magnetic plate. A limiting plate is provided on the surface of the partition plate at the corresponding position of the guide rail. The limiting plate has a groove on the side facing the magnetic plate for the guide rail to slide. The magnetic plate is a neodymium iron boron magnetic plate.

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