A method and system for preventing clogging and vibration of a coal-fired power plant ash conveying pipeline

Abstract

The application provides a kind of power plant ash conveying pipeline anti-clogging vibration method and system, belongs to the technical field of auxiliary equipment of power plant, it can at least partially solve the problem that existing method and system cannot be dynamically adjusted according to the accumulation of fly ash in pipeline, and the anti-clogging range is limited, the application is laid out by multiple subsystems, the fly ash accumulation thickness and airflow pressure difference of different sections of pipeline are monitored in real time by monitoring module, and the data is transmitted to control module, the control module dynamically adjusts the frequency and amplitude of vibration of the execution module according to the collected data, at the same time, distributed arrangement is adopted, the subsystem covers the whole process of pipeline, focuses on the easy-to-block parts such as elbow, reducing, realizes accurate targeted vibration, avoids invalid vibration energy consumption, and completely removes the accumulated ash, improves the pertinence and coverage of anti-clogging.

Description

Technical Field

[0001] This invention belongs to the technical field of auxiliary equipment for thermal power plants, specifically relating to a method and system for preventing vibration blockage in ash conveying pipelines of thermal power plants. Background Technology

[0002] During the production process of thermal power plants, a large amount of fly ash is generated after coal combustion. This fly ash usually needs to be transported to a designated location for storage or reuse through ash conveying pipelines. The ash conveying pipelines mostly adopt pneumatic conveying. However, during the conveying process, fly ash is prone to accumulate on the inner wall of the pipeline, especially at bends, diameter changes, and the bottom of horizontal pipelines, due to its own weight, friction on the inner wall of the pipeline, and uneven airflow distribution.

[0003] To address the problem of fly ash clogging in pipelines, various anti-clogging systems and methods have emerged in the existing technology. Among them, vibration anti-clogging devices are widely used due to their relatively simple structure and low cost. Most existing vibration anti-clogging devices use an eccentric motor as the vibration source. By directly fixing the eccentric motor to the fly ash pipeline, the centrifugal force generated by the motor's rotation drives the pipeline to vibrate, thus preventing fly ash accumulation. However, these devices have significant drawbacks: First, the vibration frequency and amplitude of the eccentric motor are fixed and cannot be dynamically adjusted according to the fly ash accumulation in the pipeline. When the accumulation is light, the fixed strong vibration will cause energy waste and pipeline fatigue damage; when the accumulation is heavy, the vibration intensity may be insufficient to achieve the desired unclogging effect. Second, the vibration energy transfer efficiency is low. The vibration generated by the eccentric motor is mostly concentrated near the motor installation point. The vibration intensity in other areas of the pipeline, especially at bends and diameter changes far from the installation point, is significantly attenuated, resulting in a limited anti-clogging range and easily creating anti-clogging blind spots. Third, eccentric motors are noisy when running, and the vibrations act directly on the pipeline body. Long-term use can easily lead to problems such as cracking of pipeline welds and failure of flange seals, increasing equipment maintenance costs.

[0004] To address this, a method and system for preventing vibration blockage in ash conveying pipelines of thermal power plants is proposed. Summary of the Invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art, and provides a method and system for preventing vibration and blockage in ash conveying pipelines of thermal power plants.

[0006] One aspect of the present invention provides a method for preventing vibration blockage in ash conveying pipelines of thermal power plants, comprising the following steps: S1. Collect airflow pressure data and fly ash accumulation thickness data inside the pipe; S2. Calculate the pressure difference between the airflow pressure data of two adjacent measuring points; and filter the accumulation thickness data to obtain the effective accumulation thickness. S3. Based on the relationship between the effective stacking thickness and the preset stacking threshold and twice the preset stacking threshold, and the relationship between the pressure difference and the preset pressure difference and twice the preset pressure difference, a vibration adjustment command is generated; S4. Adjust the vibration level based on vibration adjustment commands.

[0007] Furthermore, in step S4, the vibration adjustment command includes a standby command, a primary vibration command, and a secondary vibration command; A standby command is generated when the effective stacking thickness does not exceed the preset stacking threshold and the pressure difference does not exceed the preset pressure difference. When the effective stacking thickness is greater than the preset stacking threshold but not more than twice the preset stacking threshold, or when the pressure difference is greater than the preset pressure difference but not more than twice the preset pressure difference, a first-level vibration command is generated. When the effective stacking thickness exceeds twice the preset stacking threshold and the pressure difference exceeds twice the preset pressure difference, a secondary vibration command is generated.

[0008] Another aspect of the present invention provides a vibration system for preventing blockage in ash conveying pipelines of thermal power plants. The system is used to implement the above-mentioned vibration method for preventing blockage in ash conveying pipelines of thermal power plants. It includes multiple subsystems, each of which includes a monitoring module, a control module, and an execution module fixed to the outside of the ash conveying pipeline by an installation component. The monitoring module includes multiple ultrasonic detection units and multiple pressure detection units arranged at intervals along the axial direction of the ash conveying pipeline; the detection ends of the multiple ultrasonic detection units are attached to the outer wall of the ash conveying pipeline to detect the thickness of fly ash accumulation on the inner wall of the ash conveying pipeline; the spacing between two adjacent pressure detection units is equal to the spacing between two adjacent ultrasonic detection units, and the multiple pressure detection units are embedded in the inner wall of the ash conveying pipeline to detect the pressure of the airflow conveyed in the ash conveying pipeline; The control module includes a data processing unit and a drive unit; the data processing unit is electrically connected to the ultrasonic detection unit and the pressure detection unit respectively, and is used to receive the accumulation thickness data and pressure data, and generate vibration adjustment commands; the drive unit is electrically connected to the data processing unit and the execution module respectively, and is used to send the vibration adjustment commands to the execution module.

[0009] Furthermore, at least one of the aforementioned subsystems is provided at each of the bends and diameter-changing sections of the ash conveying pipeline.

[0010] Furthermore, the execution module includes a linear motor, a vibratory hammer, and a buffer assembly; the output end of the linear motor is fixedly connected to the sliding end of the vibratory hammer; the free end of the vibratory hammer faces the ash conveying pipeline; the buffer assembly is located between the free end of the vibratory hammer and the fixed end of the linear motor, one end of the buffer assembly is fixedly connected to the fixed end of the linear motor, and the buffer assembly is slidably connected to the sliding end of the vibratory hammer to absorb the impact force during the return stroke of the vibratory hammer.

[0011] Furthermore, the buffer assembly includes a guide sleeve, a buffer spring, and a rubber pad; the guide sleeve is fixedly connected to the fixed end of the linear motor, and a guide groove is provided on the guide sleeve along the output direction of the linear motor; a guide block adapted to the guide groove is provided on the vibrating hammer, and the vibrating hammer is slidably connected to the guide sleeve; the central axis of the buffer spring is parallel to the output direction of the linear motor, and one end of the buffer spring is fixedly connected to the fixed end of the linear motor; the rubber pad is fixedly installed on the other end of the buffer spring, and the rubber pad is connected to the sliding end of the vibrating hammer.

[0012] Furthermore, the installation assembly includes an arc-shaped clamp, a tightening member, and a shock-absorbing pad; the arc-shaped clamp is sleeved on the outer wall of the ash conveying pipeline; the tightening member locks both ends of the arc-shaped clamp to fix the arc-shaped clamp; the shock-absorbing pad is sleeved between the arc-shaped clamp and the ash conveying pipeline.

[0013] Furthermore, the installation assembly also includes an adjusting component; the adjusting component includes an adjusting bracket, a lead screw, a turntable, a moving block, a limiting groove, and a connecting rod; the adjusting bracket and the arc-shaped clamp are fixedly connected; the limiting groove is formed on the surface of the adjusting bracket; the lead screw is disposed in the limiting groove, one end of the lead screw is coaxially connected to the turntable, and the other end of the lead screw is rotatably connected to the adjusting bracket; the moving block is threadedly connected to the lead screw; one end of the connecting rod is fixedly connected to the moving block, and the other end of the connecting rod is fixedly connected to the fixed end of the linear motor.

[0014] Preferably, the movable block is provided with a block-shaped protrusion, and a blind groove adapted to the block-shaped protrusion is opened in the limiting groove, and the blind groove is opened along the central axis of the lead screw.

[0015] Preferably, the shock-absorbing pad is a nitrile rubber shock-absorbing pad, and the shock-absorbing pad has a honeycomb-shaped buffer structure inside.

[0016] The beneficial effects of this invention are as follows: 1. This invention uses a monitoring module to collect real-time data on the thickness of fly ash accumulation and the airflow pressure difference in the ash conveying pipeline. Based on the real-time data on the thickness of fly ash accumulation and the airflow pressure difference, the control module generates corresponding vibration adjustment commands based on the relationship between the collected data and the preset accumulation threshold and twice the preset accumulation threshold, and the preset pressure difference and twice the preset pressure difference. The control module adjusts the vibration level of the execution module according to the vibration adjustment commands. The execution module uses the corresponding vibration parameters to ensure the anti-blocking and unblocking effects, avoiding the energy waste and poor anti-blocking effect caused by fixed vibration parameters. 2. This invention sets up multiple subsystems on the ash conveying pipeline, with each subsystem responsible for a section of the pipeline. In particular, separate subsystems are configured for elbows and diameter-changing sections where blockages are common. This enables full coverage of the pipeline without blind spots, avoiding the problems of rapid vibration energy decay and insufficient vibration intensity at far ends in traditional eccentric motors. This ensures that each blockage risk area receives sufficient vibration energy to clear blockages and guarantees the overall anti-blockage effect. 3. The execution module of this invention uses a linear motor to drive a vibratory hammer to perform pulsed impact vibration. Compared with the continuous small-amplitude vibration of a traditional eccentric motor, the impact vibration energy is concentrated, the vibration energy transmission efficiency is higher, and the unblocking effect is better. With the buffer component to absorb the return impact force, it can avoid excess vibration energy from damaging the pipeline structure. 4. The present invention allows for convenient adjustment of the position of the execution module through the adjustment components of the installation assembly, adapting to the installation requirements of ash conveying pipelines of different diameters. The distance between the vibratory hammer and the outer wall of the ash conveying pipeline can also be adjusted during installation to regulate the intensity of the impact vibration, adapting to different working conditions and enhancing the overall adaptability of the device. The shock-absorbing pads in the installation assembly can isolate the excessive transmission of vibration from the execution module to the entire pipeline body, avoiding problems such as weld cracking and seal failure caused by long-term vibration. Simultaneously, the honeycomb buffer structure inside the shock-absorbing pads can significantly reduce operating noise, improve the on-site working environment, and reduce equipment maintenance costs. Attached Figure Description

[0017] Figure 1 This is a schematic flowchart of a method for preventing vibration blockage in ash conveying pipelines of thermal power plants according to a specific embodiment of the present invention. Figure 2 This is a partial external schematic diagram of a vibration prevention system for ash conveying pipelines in thermal power plants, according to a specific embodiment of the present invention. Figure 3 This is a cross-sectional schematic diagram of the ash conveying pipeline of the anti-clogging vibration system for ash conveying pipelines in thermal power plants, according to a specific embodiment of the present invention. Figure 4 This is a schematic diagram of the structure of the anti-clogging vibration system for ash conveying pipelines in thermal power plants, according to a specific embodiment of the present invention, showing the removal of the ash conveying pipeline and the vibration damping pad. Figure 5This is a partial structural diagram of the control module and installation components of a vibration prevention system for ash conveying pipelines in thermal power plants, according to a specific embodiment of the present invention. Figure 6 This is a partial cross-sectional schematic diagram of the execution module and installation components of the vibration system for preventing blockage in the ash conveying pipeline of a thermal power plant, according to a specific embodiment of the present invention. Figure 7 For the present invention Figure 5 A magnified view of part A.

[0018] The components include: 1. Monitoring module; 2. Control module; 3. Execution module; 4. Installation components; 5. Ash conveying pipeline; 11. Ultrasonic detection unit; 12. Pressure detection unit; 21. Data processing unit; 22. Drive unit; 31. Linear motor; 32. Vibratory hammer; 33. Buffer component; 41. Arc-shaped clamp; 42. Tightening component; 43. Shock-absorbing pad; 44. Adjusting component; 321. Guide block; 331. Guide sleeve; 332. Buffer spring; 333. Rubber pad; 334. Guide groove; 441. Adjusting bracket; 442. Screw; 443. Turntable; 444. Moving block; 445. Limiting groove; 446. Connecting rod; 447. Block protrusion. 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 As shown in the figure, a vibration prevention method for ash conveying pipelines in thermal power plants is provided by a specific embodiment of the present invention, comprising the following steps: S1, collecting airflow pressure data and fly ash accumulation thickness data in the pipeline; S2, calculating the pressure difference between the airflow pressure data of two adjacent measuring points; and filtering the accumulation thickness data to obtain an effective accumulation thickness; S3, generating a vibration adjustment command based on the relationship between the effective accumulation thickness and a preset accumulation threshold and twice the preset accumulation threshold, and the relationship between the pressure difference and a preset pressure difference and twice the preset pressure difference; S4, adjusting the vibration level based on the vibration adjustment command.

[0021] Specifically, in step S4, the vibration adjustment command includes a standby command, a first-level vibration command, and a second-level vibration command; a standby command is generated when the effective stacking thickness does not exceed the preset stacking threshold and the pressure difference does not exceed the preset pressure difference; a first-level vibration command is generated when the effective stacking thickness is greater than the preset stacking threshold but not more than twice the preset stacking threshold, or when the pressure difference is greater than the preset pressure difference but not more than twice the preset pressure difference; and a second-level vibration command is generated when the effective stacking thickness exceeds twice the preset stacking threshold and the pressure difference exceeds twice the preset pressure difference.

[0022] Based on the above basic implementation method, the first-level vibration command is adjusted to the first-level vibration level, and the second-level vibration command is adjusted to the second-level vibration level. The vibration frequency and amplitude of the first-level vibration are both lower than those of the second-level vibration. By using corresponding vibration frequencies and amplitudes under different blockage conditions, the effectiveness of clearing and preventing blockage can be ensured, while avoiding unnecessary energy waste and pipeline fatigue caused by continuous strong vibration.

[0023] In another embodiment, such as Figure 2 , Figure 3 and Figure 5 As shown, the present invention also provides a vibration system for preventing clogging in ash conveying pipelines of thermal power plants. This system is used to implement the aforementioned vibration method for preventing clogging in ash conveying pipelines of thermal power plants. It includes multiple subsystems deployed on the ash conveying pipeline 5. Each subsystem includes a monitoring module 1, a control module 2, and an execution module 3 fixed to the outside of the ash conveying pipeline 5 via an installation assembly 4. The monitoring module 1 includes multiple ultrasonic detection units 11 and multiple pressure detection units 12 arranged at intervals along the axial direction of the ash conveying pipeline 5. The detection ends of the multiple ultrasonic detection units 11 are attached to the outer wall of the ash conveying pipeline 5 to detect the thickness of fly ash accumulation on the inner wall of the ash conveying pipeline 5. Adjacent units 11... The spacing between pressure detection units 12 is equal to the spacing between two adjacent ultrasonic detection units 11. The plurality of pressure detection units 12 are embedded in the inner wall of the ash conveying pipeline 5 and are used to detect the pressure of the airflow conveyed in the ash conveying pipeline 5. The control module 2 includes a data processing unit 21 and a drive unit 22. The data processing unit 21 is electrically connected to the ultrasonic detection unit 11 and the pressure detection unit 12 respectively, and is used to receive the accumulation thickness data and pressure data, and generate vibration adjustment commands. The drive unit 22 is electrically connected to the data processing unit 21 and the execution module 3 respectively, and is used to send the vibration adjustment commands to the execution module 3.

[0024] Furthermore, at least one of the aforementioned subsystems is provided at each of the bends and diameter-changing sections of the ash conveying pipeline 5.

[0025] In one specific embodiment, the ultrasonic detection unit 11 and pressure detection unit 12 in the subsystem are an ultrasonic sensor and a pressure sensor, respectively. The control module 2 is integrated and installed in a sealed control box with an IP65 protection rating. The sealed control box is fixed to the mounting assembly 4 by bolts. The fixed distance between the sealed control box and the linear motor 31 is controlled at 15cm to 20cm, which avoids interference from the vibration transmission of the execution module 3 during operation and shortens the drive signal transmission path to improve the response speed. In addition, the control module 2 also includes a wireless communication unit, which is electrically connected to the central control system of the thermal power plant. When the operating temperature of the linear motor 31 exceeds 80°C, the control module 2 controls the linear motor 31 to stop running and sends an alarm signal to the central control system through the wireless communication unit.

[0026] In this embodiment, when the system is in operation, the ultrasonic sensor and pressure sensor collect data on the thickness of fly ash accumulation and the airflow pressure difference in real time within the ash conveying pipeline 5, and upload the data to the data processing unit 21. The data processing unit 21 generates vibration adjustment commands through a built-in algorithm, wherein the built-in algorithm includes the following steps: S1. Filter the stacking thickness data transmitted by the ultrasonic sensor to remove interference signals and obtain the effective stacking thickness H; calculate the pressure difference ΔP between two adjacent pressure sensors based on the pressure data transmitted by the pressure sensor. S3. Compare the effective stacking thickness H with the preset threshold H0; compare the pressure difference ΔP with the preset pressure difference ΔP0; S4. If H≤H0 and ΔP≤ΔP0, it is determined that there is no obvious blockage in the pipeline. A standby command is generated and transmitted to the drive unit 22. After receiving the command, the drive unit 22 controls the execution module 3 to be in standby mode. If H0<H≤2H0 or ΔP0<ΔP≤2ΔP0, it is determined that there is slight blockage in the pipeline. A first-level vibration command is generated and transmitted to the drive unit 22. After receiving the command, the drive unit 22 controls the execution module 3 to run at the first vibration frequency f1 and the first amplitude A1. If H>2H0 or ΔP>2ΔP0, it is determined that there is severe blockage in the pipeline. A second-level vibration command is generated and transmitted to the drive unit 22. After receiving the command, the drive unit 22 controls the execution module 3 to run at the second vibration frequency f2 and the second amplitude A2. Wherein, f2>f1 and A2>A1.

[0027] By setting up monitoring module 1 to collect the accumulation thickness of fly ash and airflow pressure difference in the ash conveying pipeline 5 in real time, control module 2 dynamically adjusts the vibration frequency and amplitude of execution module 3 based on these data, realizing intelligent adjustment of vibration parameters, effectively avoiding the problems of energy waste and poor anti-clogging effect caused by fixed vibration parameters.

[0028] Specifically, in this embodiment, a subsystem is set up at the bends and diameter-changing sections of the ash conveying pipeline 5. Due to the changes in airflow direction and pipe diameter at the bends and diameter-changing sections, fly ash is more likely to settle and accumulate on the pipe wall during the conveying process, making it a high-incidence area for blockage failures in the ash conveying pipeline 5. By configuring a separate subsystem for this area for real-time monitoring and graded clearing, the probability of blockage failures can be reduced from the source, and the scope of anti-blockage can be expanded. At the same time, in conjunction with the subsystems set up in other areas of the ash conveying pipeline 5, the zonal vibration control of the pipeline can be realized, ensuring that vibration energy is evenly transmitted to all areas of the pipeline, and effectively avoiding the formation of blind spots in anti-blockage.

[0029] Furthermore, such as Figures 2 to 4 As shown, the execution module 3 includes a linear motor 31, a vibrating hammer 32, and a buffer assembly 33; the output end of the linear motor 31 is fixedly connected to the sliding end of the vibrating hammer 32; the free end of the vibrating hammer 32 faces the ash conveying pipeline 5; the buffer assembly 33 is located between the free end of the vibrating hammer 32 and the fixed end of the linear motor 31, one end of the buffer assembly 33 is fixedly connected to the fixed end of the linear motor 31, and the buffer assembly 33 is slidably connected to the sliding end of the vibrating hammer 32 to absorb the impact force of the vibrating hammer 32 during its return stroke.

[0030] Furthermore, such as Figure 6 and Figure 7 As shown, the buffer assembly 33 includes a guide sleeve 331, a buffer spring 332, and a rubber pad 333. The guide sleeve 331 is fixedly connected to the fixed end of the linear motor 31. A guide groove 334 is provided on the guide sleeve 331 along the output direction of the linear motor 31. A guide block 321 adapted to the guide groove 334 is provided on the vibrating hammer 32. The vibrating hammer 32 is slidably connected to the guide sleeve 331. The central axis of the buffer spring 332 is parallel to the output direction of the linear motor 31. One end of the buffer spring 332 is fixedly connected to the fixed end of the linear motor 31. The rubber pad 333 is fixedly installed on the other end of the buffer spring 332 and is connected to the sliding end of the vibrating hammer 32.

[0031] In the specific embodiment described above, the vibratory hammer 32 is perpendicular to the wall of the ash conveying pipe 5, and the linear motor 31 is a permanent magnet linear motor. Compared with the traditional eccentric motor, the permanent magnet linear motor can generate linear reciprocating motion, allowing the vibratory hammer 32 to directly apply impact vibration to the ash conveying pipe 5, resulting in higher vibration energy transfer efficiency. Simultaneously, within the same subsystem, the data processing unit 21 generates vibration adjustment commands based on the collected accumulation thickness and pressure difference through a built-in algorithm and transmits them to the drive unit 22. After receiving the commands, the drive unit 22 controls the working state of the permanent magnet linear motor. Specifically, when the data processing unit 21 generates a standby command, the permanent magnet linear motor is in standby mode to reduce energy consumption. When the data processing unit 21 generates a first-level vibration command, the permanent magnet linear motor operates at a first vibration frequency f1 and a first amplitude A1. When the data processing unit 21 generates a second-level vibration command, the permanent magnet linear motor operates at a second vibration frequency f2 and a second amplitude A2. The dynamic working state of the permanent magnet linear motor effectively balances the cleaning effect with reasonable control of operating energy consumption. In addition, the buffer component 33, in conjunction with the working mode of the linear motor 31, can absorb the excess inertial impact force carried by the vibratory hammer 32 when it returns from its impact action. On the one hand, it avoids damage to the internal structure of the linear motor 31 by the hard impact of the vibratory hammer 32 during its return, effectively extending the service life of the execution module 3. On the other hand, it prevents the reverse impact force from being transmitted to the wall of the ash conveying pipeline 5, reducing unnecessary vibration energy input and lowering the probability of structural fatigue caused by long-term alternating loads on the pipeline.

[0032] The guide groove 334 on the guide sleeve 331 is adapted to the guide block 321 on the vibratory hammer 32, which can also accurately limit the reciprocating motion path of the vibratory hammer 32, prevent the vibratory hammer 32 from deviating during the movement, ensure that the vibratory hammer 32 always outputs impact force in a direction perpendicular to the pipe wall, greatly improve the transmission efficiency of vibration energy, and further enhance the unblocking and anti-blocking effect.

[0033] Furthermore, such as Figures 3 to 6 As shown, the installation assembly 4 includes an arc-shaped clamp 41, a tightening member 42, and a shock-absorbing pad 43; the arc-shaped clamp 41 is sleeved on the outer wall of the ash conveying pipeline 5; the tightening member 42 locks the two ends of the arc-shaped clamp 41 to fix the arc-shaped clamp 41; the shock-absorbing pad 43 is sleeved between the arc-shaped clamp 41 and the ash conveying pipeline 5.

[0034] Furthermore, the installation assembly 4 also includes an adjusting component 44; the adjusting component 44 includes an adjusting bracket 441, a lead screw 442, a turntable 443, a moving block 444, a limiting groove 445, and a connecting rod 446; the adjusting bracket 441 and the arc-shaped clamp 41 are fixedly connected; the limiting groove 445 is formed on the surface of the adjusting bracket 441; the lead screw 442 is disposed in the limiting groove 445, one end of the lead screw 442 is coaxially connected to the turntable 443, and the other end of the lead screw 442 is rotatably connected to the adjusting bracket 441; the moving block 444 is threadedly connected to the lead screw 442; one end of the connecting rod 446 is fixedly connected to the moving block 444, and the other end of the connecting rod 446 is fixedly connected to the fixed end of the linear motor 31.

[0035] Furthermore, the moving block 444 is provided with a block-shaped protrusion 447, and a blind groove adapted to the block-shaped protrusion 447 is opened in the limiting groove 445. The blind groove is opened along the central axis of the lead screw 442.

[0036] Furthermore, the shock-absorbing pad 43 is a nitrile rubber shock-absorbing pad, and the interior of the shock-absorbing pad 43 is provided with a honeycomb buffer structure.

[0037] In the above embodiments, the arc-shaped clamp 41, together with the tightening component 42, enables the device to be quickly installed and fixed on the outer wall of the ash conveying pipeline 5, so as to adapt to the different installation requirements of the ash conveying pipeline 5 in thermal power plants; the thickness of the shock-absorbing pad 43 is set to 10mm, which is used to absorb some vibration energy, avoid excessive vibration transmission to the main structure of the pipeline, and reduce noise; the shock-absorbing pad 43 made of nitrile rubber has good wear resistance, aging resistance, and high temperature resistance, and is suitable for the operating conditions of the ash conveying pipeline 5 with a lot of dust and large temperature fluctuations. Its internal honeycomb buffer structure can not only block the vibration of the execution module 3 from being excessively transmitted to the entire ash conveying pipeline 5, avoiding problems such as weld cracking and seal aging failure caused by long-term vibration, but also absorb the mechanical noise generated during operation, effectively improving the working environment at the power plant site and reducing the overall maintenance cost of the equipment. When it is necessary to adjust the vibration impact intensity or adapt to the installation requirements of different diameter ash conveying pipelines 5, rotating the turntable 443 drives the lead screw 442 to rotate, which in turn drives the moving block 444 to move along the axial direction of the lead screw 442. Then, through the connecting rod 446, it drives the permanent magnet linear motor and the vibrating hammer 32 to move as a whole, quickly adjusting the distance between the free end of the vibrating hammer 32 and the outer wall of the ash conveying pipeline 5. The operation is convenient, and the overall adaptability of the device is stronger, which can meet the anti-clogging operation requirements of the ash conveying pipeline 5 in different scenarios. During the movement, the block-shaped protrusions 447 on the upper and lower surfaces of the moving block 444 are adapted to the blind groove, which can prevent the moving block 444 from rotating during the sliding process and improve the stability of the adjustment process.

[0038] In summary, the embodiments disclosed herein have at least the following technical effects: 1. This invention uses a monitoring module to collect real-time data on the thickness of fly ash accumulation and the airflow pressure difference in the ash conveying pipeline. Based on the real-time data on the thickness of fly ash accumulation and the airflow pressure difference, the control module generates corresponding vibration adjustment commands based on the relationship between the collected data and the preset accumulation threshold and twice the preset accumulation threshold, and the preset pressure difference and twice the preset pressure difference. The control module adjusts the vibration level of the execution module according to the vibration adjustment commands. The execution module uses the corresponding vibration parameters to ensure the anti-blocking and unblocking effects, avoiding the energy waste and poor anti-blocking effect caused by fixed vibration parameters. 2. This invention sets up multiple subsystems on the ash conveying pipeline, with each subsystem responsible for a section of the pipeline. In particular, separate subsystems are configured for elbows and diameter-changing sections where blockages are common. This enables full coverage of the pipeline without blind spots, avoiding the problems of rapid vibration energy decay and insufficient vibration intensity at far ends in traditional eccentric motors. This ensures that each blockage risk area receives sufficient vibration energy to clear blockages and guarantees the overall anti-blockage effect. 3. The execution module of this invention uses a linear motor to drive a vibratory hammer to perform pulsed impact vibration. Compared with the continuous small-amplitude vibration of a traditional eccentric motor, the impact vibration energy is concentrated, the vibration energy transmission efficiency is higher, and the unblocking effect is better. With the buffer component to absorb the return impact force, it can avoid excess vibration energy from damaging the pipeline structure. 4. The present invention allows for convenient adjustment of the position of the execution module through the adjustment components of the installation assembly, adapting to the installation requirements of ash conveying pipelines of different diameters. The distance between the vibratory hammer and the outer wall of the ash conveying pipeline can also be adjusted during installation to regulate the intensity of the impact vibration, adapting to different working conditions and enhancing the overall adaptability of the device. The shock-absorbing pads in the installation assembly can isolate the excessive transmission of vibration from the execution module to the entire pipeline body, avoiding problems such as weld cracking and seal failure caused by long-term vibration. Simultaneously, the honeycomb buffer structure inside the shock-absorbing pads can significantly reduce operating noise, improve the on-site working environment, and reduce equipment maintenance costs.

[0039] 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 method for preventing vibration blockage in ash conveying pipelines of thermal power plants, characterized in that, Includes the following steps: S1. Collect airflow pressure data and fly ash accumulation thickness data inside the pipe; S2. Calculate the pressure difference between the airflow pressure data of two adjacent measuring points; Furthermore, the stacking thickness data is filtered to obtain the effective stacking thickness; S3. Based on the relationship between the effective stacking thickness and the preset stacking threshold and twice the preset stacking threshold, and the relationship between the pressure difference and the preset pressure difference and twice the preset pressure difference, a vibration adjustment command is generated; S4. Adjust the vibration level based on vibration adjustment commands.

2. The method for preventing vibration blockage in ash conveying pipelines of thermal power plants according to claim 1, characterized in that, In step S4, the vibration adjustment command includes a standby command, a first-level vibration command, and a second-level vibration command; A standby command is generated when the effective stacking thickness does not exceed the preset stacking threshold and the pressure difference does not exceed the preset pressure difference. When the effective stacking thickness is greater than the preset stacking threshold but not more than twice the preset stacking threshold, or when the pressure difference is greater than the preset pressure difference but not more than twice the preset pressure difference, a first-level vibration command is generated. When the effective stacking thickness exceeds twice the preset stacking threshold and the pressure difference exceeds twice the preset pressure difference, a secondary vibration command is generated.

3. A vibration system for preventing blockage in ash conveying pipelines of thermal power plants, characterized in that, It includes multiple subsystems deployed on the ash conveying pipeline, and the subsystems include a monitoring module, a control module, and an execution module fixed to the outside of the ash conveying pipeline by an installation component; The monitoring module includes multiple ultrasonic detection units and multiple pressure detection units arranged at intervals along the axial direction of the ash conveying pipeline; the detection ends of the multiple ultrasonic detection units are attached to the outer wall of the ash conveying pipeline to detect the thickness of fly ash accumulation on the inner wall of the ash conveying pipeline; the spacing between two adjacent pressure detection units is equal to the spacing between two adjacent ultrasonic detection units, and the multiple pressure detection units are embedded in the inner wall of the ash conveying pipeline to detect the pressure of the airflow conveyed in the ash conveying pipeline; The control module includes a data processing unit and a drive unit; the data processing unit is electrically connected to the ultrasonic detection unit and the pressure detection unit respectively, and is used to receive the accumulation thickness data and pressure data, and generate vibration adjustment commands; the drive unit is electrically connected to the data processing unit and the execution module respectively, and is used to send the vibration adjustment commands to the execution module.

4. The vibration prevention system for ash conveying pipelines in thermal power plants according to claim 3, characterized in that, At least one of the aforementioned subsystems is provided at each bend and diameter reduction section of the ash conveying pipeline.

5. The vibration prevention system for ash conveying pipelines in thermal power plants according to claim 3, characterized in that, The execution module includes a linear motor, a vibratory hammer, and a buffer assembly; the output end of the linear motor is fixedly connected to the sliding end of the vibratory hammer; the free end of the vibratory hammer faces the ash conveying pipeline; the buffer assembly is located between the free end of the vibratory hammer and the fixed end of the linear motor, one end of the buffer assembly is fixedly connected to the fixed end of the linear motor, and the buffer assembly is slidably connected to the sliding end of the vibratory hammer to absorb the impact force during the return stroke of the vibratory hammer.

6. The vibration prevention system for ash conveying pipelines in thermal power plants according to claim 5, characterized in that, The buffer assembly includes a guide sleeve, a buffer spring, and a rubber pad. The guide sleeve is fixedly connected to the fixed end of the linear motor. A guide groove is provided on the guide sleeve along the output direction of the linear motor. A guide block adapted to the guide groove is provided on the vibrating hammer. The vibrating hammer is slidably connected to the guide sleeve. The central axis of the buffer spring is parallel to the output direction of the linear motor. One end of the buffer spring is fixedly connected to the fixed end of the linear motor. The rubber pad is fixedly installed on the other end of the buffer spring and is connected to the sliding end of the vibrating hammer.

7. The vibration prevention system for ash conveying pipelines in thermal power plants according to claim 6, characterized in that, The installation assembly includes an arc-shaped clamp, a tightening component, and a shock-absorbing pad; the arc-shaped clamp is sleeved on the outer wall of the ash conveying pipeline; the tightening component locks both ends of the arc-shaped clamp to fix the arc-shaped clamp; the shock-absorbing pad is sleeved between the arc-shaped clamp and the ash conveying pipeline.

8. The vibration prevention system for ash conveying pipelines in thermal power plants according to claim 7, characterized in that, The installation assembly further includes an adjusting component; the adjusting component includes an adjusting bracket, a lead screw, a turntable, a moving block, a limiting groove, and a connecting rod; the adjusting bracket and the arc-shaped clamp are fixedly connected; the limiting groove is formed on the surface of the adjusting bracket; the lead screw is disposed in the limiting groove, one end of the lead screw is coaxially connected to the turntable, and the other end of the lead screw is rotatably connected to the adjusting bracket; the moving block is threadedly connected to the lead screw; one end of the connecting rod is fixedly connected to the moving block, and the other end of the connecting rod is fixedly connected to the fixed end of the linear motor.

9. The vibration prevention system for ash conveying pipelines in thermal power plants according to claim 7, characterized in that, The movable block is provided with a block-shaped protrusion, and a blind groove adapted to the block-shaped protrusion is opened in the limiting groove. The blind groove is opened along the central axis of the lead screw.

10. The vibration prevention system for ash conveying pipelines in thermal power plants according to claim 7, characterized in that, The shock-absorbing pad is a nitrile rubber shock-absorbing pad, and the inside of the shock-absorbing pad has a honeycomb buffer structure.

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