Dust removal and ash conveying system capable of preventing balance pipe from being blocked

Abstract

The utility model relates to the technical field of electric dust removal pneumatic ash conveying, in particular to a dust removal ash conveying system capable of preventing a balance pipe from being blocked, which comprises a turbulent flow device, the turbulent flow device comprises a turbulent flow pipe, two ends of the turbulent flow pipe are respectively installed and connected on the balance pipe and a compressed air pipe, and air holes are arranged on the balance pipe and the compressed air pipe corresponding to installation positions of the turbulent flow pipe. The connecting line of the air hole of the balance pipe and the air hole of the compressed air pipe is parallel to the ash conveying pipe. By implementing the scheme, an original flow field in the balance pipe is changed, the balance pipe is prevented from being blocked by dust, and normal operation of a dust removal and conveying system is ensured.

Description

Technical Field

[0001] This utility model relates to the field of electrostatic precipitator pneumatic ash conveying technology, specifically to a dust removal and ash conveying system that prevents the balancing pipe from clogging. Background Technology

[0002] The current method of ash conveying in thermal power plants mainly uses compressed air for dust removal. The working process is as follows: when a lot of dust accumulates in the ash removal hopper, it is necessary to unload the ash regularly. Open the ash discharge valve below the ash removal hopper to discharge the ash into the silo pump (small ash hopper). Then close the ash discharge valve and open the main blow valve of the compressed air pipeline and the ash inlet valve of the pipeline before the centralized collection device. The compressed air will blow the ash discharged into the silo pump into the centralized collection device. Since the silo pump and the ash pipe are a sealed space, there is residual compressed air pressure in the silo pump after ash conveying. In order to avoid the pressure in the silo pump being higher than the pressure in the ash removal hopper, which would prevent the silo pump from receiving the ash discharge from the ash removal hopper smoothly in the next cycle, a pressure relief pipe is installed between the ash removal hopper and the ash conveying pipe. A balancing valve is installed near the ash conveying pipe. The pressure relief pipe between the balancing valve and the ash conveying pipe is the balancing pipe. After one ash conveying cycle, this balancing valve needs to be opened to release the pressure in the silo pump and make the pressure in the silo pump the same as that in the ash removal hopper, so that the next ash conveying can proceed smoothly.

[0003] However, in actual production, it was found that after prolonged operation of the ash removal device, the balancing valve could not release pressure normally. After long-term on-site monitoring and verification, it was discovered that this was due to blockage in the balancing pipe, affecting normal material loading and ash conveying operations. Inspection revealed that because the balancing valve was some distance from the ash conveying pipe, the balancing pipe had formed a blind pipe structure. During ash conveying, vortices were generated between the balancing pipe and the ash conveying pipe, causing finer, more moist ash to adhere to the pipe wall and block the pipe. The existing electrostatic precipitator pneumatic ash conveying system experienced balancing pipe blockage, which, once blocked, could not meet the continuous production requirements of thermal power plants.

[0004] To solve the above-mentioned technical problems, this utility model designs a dust removal and ash conveying system to prevent the balancing pipe from clogging. By balancing the pressure inside the balancing pipe, the original flow field is changed, ensuring the normal operation of the dust removal and ash conveying system and reducing the maintenance workload of maintenance personnel in clearing the balancing pipe. Utility Model Content

[0005] The present invention aims to provide a dust removal and ash conveying system that prevents the balancing pipe from clogging. By changing the original flow field, the dust is prevented from clogging the balancing pipe, thus ensuring the normal operation of the dust removal and ash conveying system.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A dust collection and ash conveying system for preventing blockage of a balance pipe includes a turbulence device. The turbulence device includes a turbulence pipe, with its two ends respectively installed and connected to a balance pipe and a compressed air pipe. The balance pipe and the compressed air pipe have air holes at positions corresponding to the installation of the turbulence pipe. The air holes are located close to the balance valve, and the line connecting the air holes of the balance pipe and the air holes of the compressed air pipe is parallel to the ash conveying pipe.

[0008] The principles and advantages of this scheme are:

[0009] This solution features a rationally designed and highly efficient device that effectively solves the problem of balancing pipe blockage. In actual production, it was found that after prolonged operation of the ash removal device, the balancing valve failed to release pressure properly. Initially, it was thought to be a problem with the pressure relief pipe or valve. Replacing the pressure relief pipe did restore normal operation, but the same problem recurred after a period of time. After long-term monitoring and verification by the inventors and maintenance personnel, it was discovered that the blockage was caused by the balancing pipe. A careful analysis revealed that the balancing pipe had formed a blind pipe structure, generating vortices. This allowed finer, more humid ash to enter the balancing pipe under the influence of these vortices, eventually causing blockage. Having identified the root cause, the inventors addressed the issue by altering the flow field and disrupting the vortices. Through analysis of the existing equipment structure, they directly modified the existing equipment by creating air holes in both the compressed air pipe and the balancing pipe. A flow-disrupting pipe was then led from the compressed air pipe to the bottom of the balancing pipe, effectively solving the balancing pipe blockage problem, ensuring the smooth operation of the ash conveying system, reducing the workload of maintenance personnel in clearing the balancing pipe, and improving the production efficiency of the thermal power plant.

[0010] Furthermore, it also includes a connecting device. The turbulence tube includes at least two sections. The two turbulence tubes are detachably connected to the connecting device. The ends of the two turbulence tubes away from the connecting device are provided with external threads in sequence. The other ends of the two turbulence tubes are provided with sealing rings. The balance tube and the compressed air tube are provided with connectors with internal threads that mate with the external threads. The connectors are coaxial with the air holes.

[0011] The aforementioned baffle pipes are generally fixed by direct welding. However, due to the long length of the baffle pipes, direct installation is very laborious and cumbersome, and there is a risk of improper installation and unstable connections at the pipe joints. Furthermore, if damaged, they are essentially irreplaceable. Therefore, to facilitate both initial installation and subsequent maintenance, the baffle pipes are divided into two sections and connected by a connecting device. The baffle pipes can be flexibly adjusted or replaced according to actual needs, greatly improving the maintainability and adaptability of the system.

[0012] Furthermore, the connecting device includes a cylinder and a one-way locking mechanism. The one-way locking mechanism is evenly spaced along the circumference of both ends of the cylinder. The one-way locking mechanism controls the direction towards the center of the connecting device, and the inner diameter of the cylinder is equal to the diameter of the sealing ring.

[0013] The one-way locking mechanism serves as a quick limiting device, allowing the baffle tube to be inserted quickly to complete the initial limiting connection. This mechanism ensures the baffle tube will not dislodge due to vibration or external forces during operation, improving system stability and reliability. Evenly spaced end circumferences ensure uniform stress distribution and prevent localized wear. The inner diameter of the cylinder is equal to the diameter of the sealing ring, enhancing sealing performance and also providing a limiting function.

[0014] Furthermore, the one-way locking mechanism includes a one-way locking handle and a locking tooth that cooperates with the one-way locking handle. A torsion spring is provided at the pivot of the one-way locking handle, and the locking tooth is located at the end of the turbulence tube away from the external thread. The one-way locking handle is hinged to both ends inside the cylinder.

[0015] The one-way locking handle and locking teeth provide quick-stop functionality, allowing the spoiler tube to be inserted for initial positioning. Disassembly is achieved simply by squeezing the one-way locking handle; when released, the handle automatically resets under the action of a torsion spring. During routine maintenance, operators can easily adjust or replace the spoiler tube using the one-way locking mechanism, significantly reducing installation and maintenance time.

[0016] Furthermore, the turbulence device also includes an electric valve and a controller. Pressure sensors are installed in both the ash conveying pipe and the balance pipe. The electric valve is installed at the input end of the turbulence pipe, and the controller is used to receive the signal from the pressure sensor and control the opening degree of the electric valve through the pressure difference.

[0017] The electric valve automatically adjusts its opening based on the pressure difference between the ash conveying pipe and the balancing pipe, altering the secondary airflow volume to ensure the pressure in the balancing pipe is always higher than that in the ash conveying pipe. This efficiently distributes the ratio of primary to secondary airflow, maximizing the primary airflow while ensuring sufficient secondary airflow to prevent blockages, thus improving overall operating efficiency. These improvements enable thermal power plants to effectively avoid downtime and maintenance issues caused by balancing pipe blockages, significantly saving maintenance costs and time, and ensuring overall stability and economy.

[0018] Furthermore, the connecting mechanism also includes two limiting rings, which are slidably connected to the middle of the cylinder. The sliding resistance of the limiting rings is greater than the restoring force of the torsion spring.

[0019] Because the pipeline is quite long, it is very strenuous for a single operator to tighten the pipe end by hand while holding the one-way lock handle during the installation of the baffle. Therefore, two limit rings are installed. When the limit ring slides and locks the one-way lock handle, the sliding resistance of the limit ring is greater than the restoring force of the torsion spring, effectively limiting the one-way lock handle. At this time, the operator can free up their hands to directly operate the end of the baffle. After the connection and fixation are completed, sliding the limit ring releases the limitation on the one-way lock handle, and the one-way lock handle locks the baffle.

[0020] Furthermore, the diameter of the baffle tube is 20mm-25mm.

[0021] To ensure the high efficiency of the baffle tube, multiple practical tests revealed that baffle tubes with a diameter of 20mm-25mm performed best overall. Baffle tubes smaller than this range could not completely suppress vortex generation and still resulted in ash accumulation, while baffle tubes larger than this range diverted too much of the main airflow, affecting the ash conveying efficiency of the ash conveying pipe. Only baffle tubes within the 20-25mm range could prevent vortex generation and avoid clogging of the balance pipe without affecting the original ash conveying efficiency. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model.

[0023] Figure 2 This is a schematic diagram of the baffle tube structure according to an embodiment of the present utility model.

[0024] Figure 3 for Figure 2 View A.

[0025] Figure 4 for Figure 3 The limit state. Detailed Implementation

[0026] The following detailed description illustrates the specific implementation method:

[0027] In this utility model, for ease of description, the relative positional relationships of each component are described according to the layout of the accompanying drawings. For example, the positional relationships of top, bottom, left, right, etc., are determined according to the layout direction in the accompanying drawings.

[0028] The reference numerals in the accompanying drawings include: ash conveying pipe 1, compressed air pipe 2, turbulence pipe 3, ash removal device 4, pressure relief pipe 5, connecting device 6, main blowing valve 21, electric regulating valve 31, locking tooth 32, sealing ring 33, balance valve 51, balance pipe 52, one-way locking handle 61, and limit ring 62.

[0029] The basic implementation examples are as follows: Figure 1-3 As shown:

[0030] As attached Figure 1As shown, a dust removal and ash conveying system for preventing blockage of the balance pipe 52 includes a turbulence device and a connecting device 6. The turbulence device includes a turbulence pipe 3 and an electric regulating valve 31. When the balance valve 51 is closed, the balance pipe 52 forms a blind pipe structure. When the ash conveying pipe 1 is working, a vortex is generated between the balance pipe 52 and the ash conveying pipe 1, causing finer ash with higher humidity to adhere to the pipe wall. Over time, the balance pipe 52 will be completely blocked, resulting in the inability to release pressure and thus preventing normal ash unloading. This solution introduces the turbulence pipe 3 to disrupt the original air pressure state, causing the vortex to disappear and increasing the pressure inside the balance pipe 52. This prevents dust from entering the balance pipe 52, effectively solving the blockage problem of the balance pipe 52.

[0031] As attached Figure 2 As shown, the material of the baffle pipe 3 is galvanized steel pipe. Through calculation and field test, the optimal pipe diameter of the baffle pipe 3 is determined to be 20-25mm. The baffle pipe 3 is divided into two sections, and the two baffle pipes 3 are connected by the connecting device 6. Since the baffle pipe 3 is about 10 meters long, it is very laborious and troublesome to install a whole section of the baffle pipe 3 directly. Although the dimensions at both ends can be measured well, the baffle pipe 3 is long, and it will bend during installation. There will be problems with improper installation and instability at the connection. Furthermore, subsequent replacement and maintenance are also very troublesome. Dividing it into two sections and connecting them with the connecting device 6 can effectively solve the above problems caused by the excessive length of the pipe.

[0032] The two spoiler pipes 3 are arranged in a mirror image with the connecting device 6 as the center. Taking the left spoiler pipe 3 as an example, see attached. Figure 2 and attached Figure 3 As shown, the left end of the baffle tube 3 has an external thread, and the right end has a retaining tooth 32 and a sealing ring 33. The sealing ring 33 is located at the rightmost end, and its diameter is slightly larger than the inner diameter of the connecting device 6. The connecting device 6 includes a cylindrical body, a one-way locking handle 61 that cooperates with the retaining tooth 32, and a limiting ring 62. The one-way locking handle 61 is equidistantly arranged at the circumferential ends of both ends of the cylindrical body of the connecting device 6. The inner diameter of the cylindrical body is slightly smaller than the diameter of the sealing ring 33. The limiting ring 62 is coaxially slidably connected to the outside of the connecting device 6. The end of the baffle tube 3 with the sealing ring 33 is inserted into the connecting device 6. Under the action of the retaining tooth 32, the one-way locking handle 61 controls the direction toward the center of the connecting device. If the one-way locking handle 61 is not moved, it can only move to the right in one direction. Figure 4 As shown, sliding the limiting ring 62 to the left causes the one-way locking handle 61 to rotate clockwise, releasing the one-way locking handle 61 from limiting and locking the spoiler tube 3, allowing the spoiler tube 3 to be pulled out. The structure on the other side is the same. In this way, the two spoiler tubes 3 can be quickly connected or disconnected through the connecting device 6, and can extend and retract within a certain range.

[0033] The one-way locking handle 61 serves as a quick-stop mechanism, allowing the baffle tube 3 to be quickly inserted and initially connected. The one-way locking handle 61 ensures that the baffle tube 3 will not dislodge due to vibration or external forces during operation, improving the system's stability and reliability. The evenly spaced circumference at the ends ensures uniform force distribution, preventing localized wear. The inner diameter of the cylinder is slightly smaller than the diameter of the sealing ring 33, enhancing sealing performance and also providing a stopping function. If the baffle tube 3 were not retractable, installing both ends would be extremely difficult. During routine maintenance, operators can easily adjust or replace the baffle tube 3 using the one-way locking mechanism, significantly reducing installation and maintenance time.

[0034] Air holes are provided on the compressed air pipe 2 and the balance pipe 52 at the positions where the turbulence pipe 3 is installed, and a through-hole connector with internal thread is installed and connected. The through-hole connector is coaxial with the air hole. After the air hole and the through-hole connector are connected to the turbulence pipe 3, a passage is formed. The connector of the balance pipe 52 is located near the balance valve 51. The left end of the turbulence pipe 3 is connected to the connector of the compressed air pipe 2, and the right end is connected to the connector of the balance pipe 52. An electric regulating valve 31 and a controller are also installed on the turbulence pipe 3 near the compressed air pipe 2.

[0035] Pressure monitoring devices are installed in both the balance pipe 52 and the ash conveying pipe 1 to transmit pressure data signals to the controller of the electric valve in real time. The controller controls the opening of the electric valve through the pressure difference controller, efficiently distributes the ratio of the main airflow and the secondary airflow, and keeps the electric valve in the most suitable state. This ensures that the pressure in the balance pipe 52 is always greater than the pressure in the ash conveying pipe 1, maintaining the overall optimal state, minimizing energy consumption and maximizing efficiency.

[0036] The specific implementation process is as follows:

[0037] First, connect the left-side spoiler tube 3 to the connector of the compressed air pipe 2 via external thread. Then, insert the connecting device 6 into the end of the left-side spoiler tube 3 with the sealing ring 33. Next, slide the right-side limiting ring 62 to rotate the right-side one-way locking handle 61 to release the limiting. Insert the right-side spoiler tube 3 into the connecting device 6. Then, fix the right-side spoiler tube 3 to the connector of the balance pipe 52. Slide the right-side limiting ring 62 to release the limiting of the right-side one-way locking handle 61. The one-way locking handle 61 resets under the action of the torsion spring and locks the right-side spoiler tube 3. This completes the overall connection and installation.

[0038] When the ash removal device 4 starts unloading ash, the ash discharge valve and the rightmost ash inlet valve are opened. Then, the main blow valve 21 of the compressed air pipe 2 is opened. The compressed air is divided into two streams from the main blow valve 21. The main stream enters the ash conveying pipe 1 and blows the ash into the centralized storage device. The secondary stream enters the turbulence pipe 3 through the electric regulating valve 31 and then enters the ash conveying pipe 1 downwards along the balance pipe 52. The air pressure sensor transmits the pressure data signal to the controller of the electric valve in real time, and adjusts the opening of the electric valve to always keep the pressure in the balance pipe 52 greater than the pressure in the ash conveying pipe 1. During this process, the turbulence pipe 3 disrupts the gas flow field in the blind pipe, increases the pressure in the balance pipe 52 so that it is greater than the pressure in the ash conveying pipe 1, avoids the generation of vortices, and prevents dust from entering the blind pipe and accumulating, thus solving the problem of the balance pipe 52 being blocked by dust.

[0039] Although the structure of this solution is simple, its concept is ingenious. By deeply analyzing the actual situation on site, the essence of the blockage problem is found. Then, based on the essence of the problem, the optimal solution is determined by combining calculation and experiment. The original flow field is changed through a simple and reasonable structural design, which increases the pressure in the balance pipe, ensures the normal operation of the dust removal and ash conveying system, reduces the maintenance workload of maintenance personnel in clearing the balance pipe, and achieves twice the result with half the effort.

[0040] The above descriptions are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A dust collection and ash conveying system for preventing blockage of the balance pipe, characterized in that: It includes a flow-dispersing device, which includes a flow-dispersing pipe. The two ends of the flow-dispersing pipe are respectively installed and connected to a balance pipe and a compressed air pipe. The balance pipe and the compressed air pipe have air holes at the positions corresponding to the installation positions of the flow-dispersing pipe. The positions of the air holes are close to the balance valve. The line connecting the air holes of the balance pipe and the air holes of the compressed air pipe is parallel to the ash conveying pipe.

2. The dust collection and ash conveying system for preventing blockage of the balance pipe according to claim 1, characterized in that: It also includes a connecting device. The turbulence tube includes at least two sections. The two turbulence tubes are detachably connected to the connecting device. The ends of the two turbulence tubes away from the connecting device are provided with external threads in sequence. The other ends of the two turbulence tubes are provided with sealing rings. The balance tube and the compressed air tube are provided with connectors with internal threads that mate with the external threads. The connectors are coaxial with the air holes.

3. A dust collection and ash conveying system for preventing blockage of the balance pipe according to claim 2, characterized in that: The connecting device includes a cylinder and a one-way locking mechanism. The one-way locking mechanism is evenly spaced along the circumference of both ends of the cylinder. The one-way locking mechanism controls the direction towards the center of the connecting device. The inner diameter of the cylinder is equal to the diameter of the sealing ring.

4. A dust collection and ash conveying system for preventing blockage of the balance pipe according to claim 3, characterized in that: The one-way locking mechanism includes a one-way locking handle and a locking tooth that cooperates with the one-way locking handle. A torsion spring is provided at the pivot of the one-way locking handle, and the locking tooth is located at the end of the turbulence tube away from the external thread. The one-way locking handle is hinged to both ends inside the cylinder.

5. A dust collection and ash conveying system for preventing blockage of the balance pipe according to claim 4, characterized in that: The turbulence device also includes an electric valve and a controller. Pressure sensors are installed in both the ash conveying pipe and the balance pipe. The electric valve is installed at the input end of the turbulence pipe. The controller is used to receive the signal from the pressure sensor and control the opening degree of the electric valve through the pressure difference.

6. A dust collection and ash conveying system for preventing blockage of the balance pipe according to claim 5, characterized in that: The connecting mechanism also includes two limiting rings, which are slidably connected to the middle of the cylinder. The sliding resistance of the limiting rings is greater than the restoring force of the torsion spring.

7. A dust collection and ash conveying system for preventing blockage of the balance pipe according to claim 6, characterized in that: The diameter of the baffle tube is 20mm-25mm.

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