Special three-way device for preventing blockage of ash conveying pipeline of economizer

Abstract

The utility model discloses a special three-way device for blocking prevention of an ash conveying pipeline of a coal economizer, which comprises a three-way body provided with a horizontal inlet, a horizontal outlet and an inclined outlet, a large-aperture filter screen is arranged at the horizontal outlet of the three-way body, and a flange of the inclined outlet of the three-way body is connected with a detachable blocking plate through a bolt. The blocking plate is used for sealing the inclined outlet; flanges are arranged at the inlet and the outlet of the tee body, and corresponding counter flanges are arranged at the flanges of the horizontal inlet and the horizontal outlet. According to the utility model, the large-aperture filter screen is arranged at the horizontal outlet of the tee joint body to intercept sundries conveyed along with fly ash, and the blockage can be conveniently and quickly cleaned through the design of the detachable blocking plate. In addition, an arc-shaped or spiral guide plate is adopted, so that the flowing path of the coal ash is optimized, the impact on the filter screen is reduced, and the service life of the filter screen is prolonged.

Description

Technical Field

[0001] This utility model relates to the technical field of ash conveying systems in thermal power plants, and in particular to a special three-way device for preventing blockage of economizer ash conveying pipelines. Background Technology

[0002] In thermal power plants, the economizer ash conveying system is a crucial component ensuring the normal operation of the boiler. Its main function is to transport the fly ash produced by the economizer through pipelines to designated ash silos or treatment facilities. However, during actual operation, debris such as wear-resistant tiles, detached refractory materials, and welding slag from inside the economizer may fall into the ash conveying pipeline, causing blockages. Once a blockage occurs, the system pressure transmitter will issue an alarm, and the local pressure gauge will display positive pressure, indicating an abnormally high pressure within the pipeline. Immediate action must be taken to restore the system to normal operation.

[0003] Economizer ash conveying systems typically use compressed air pneumatic conveying, and the ash conveying pipeline is under negative pressure during normal operation. When a blockage occurs in the ash conveying pipeline, the pressure inside the pipeline rises rapidly, triggering a pressure alarm from the pressure transmitter on the pipeline, and the local pressure gauge displays positive pressure. This pressure change is a clear signal of system blockage, but this signal alone is insufficient to quickly locate the blockage. Due to the long length of the ash conveying pipeline, numerous bends, and the fact that most are located at high altitudes, once a blockage occurs, not only is it necessary to erect a large amount of scaffolding, but also to expend considerable manpower and time to systematically search and clear the blockage along the pipeline. This process is not only time-consuming and labor-intensive, but may also lead to the shutdown of the economizer ash conveying system, indirectly causing unit shutdowns and seriously affecting the safe and stable operation of the unit.

[0004] The existing ash conveying pipeline system has the following main problems in handling blockages: ① Difficulty in locating: The pipeline is long, has many bends, and is mostly located in high-altitude areas, making it difficult to quickly locate the blockage point; ② High maintenance costs: A large amount of scaffolding needs to be erected, and a lot of manpower and time are spent on inspection and cleaning; ③ Difficulty in cleaning: The blockage may be stuck inside the pipeline and difficult to remove, resulting in difficulty in cleaning. Utility Model Content

[0005] The technical problem this invention aims to solve is to provide a dedicated tee device for preventing blockages in economizer ash conveying pipelines. This device quickly locates blockage points and facilitates the removal of obstructions, thereby improving the reliability and maintenance efficiency of the ash conveying system. This invention uses a large-aperture filter screen at the horizontal outlet of the tee body to intercept debris transported with fly ash, and a detachable blocking plate design facilitates rapid removal of blockages. Furthermore, this invention employs arc-shaped or spiral-shaped guide plates to optimize the flow path of fly ash, reduce impact on the filter screen, and extend the filter screen's service life.

[0006] The technical solution adopted by this utility model to solve the technical problem is as follows:

[0007] A special tee device for preventing blockage in an economizer ash conveying pipeline includes a tee body with a horizontal inlet, a horizontal outlet, and an oblique outlet. A large-aperture filter screen is installed at the horizontal outlet of the tee body to intercept debris transported with fly ash. A detachable blocking plate is bolted to the flange of the oblique outlet of the tee body to seal the oblique outlet and to clean debris in front of the filter screen. Flanges are provided at both the inlet and outlet of the tee body, and corresponding reverse flanges are provided at the flanges of the horizontal inlet and outlet.

[0008] Preferably, the flange and the anti-flange are connected by bolts, and a sealing gasket is provided at the connection to ensure sealing performance; a sealing gasket is also provided between the flange and the plug plate, and an anti-loosening washer is provided at the nut end of the bolt to prevent the bolt from loosening due to vibration during ash conveying.

[0009] Preferably, the large-aperture filter screen has a detachable structure, which facilitates regular replacement or cleaning, and the filter screen is made of high-strength stainless steel to adapt to the high-pressure environment inside the ash conveying pipeline; the pore size of the large-aperture filter screen is designed according to the size of the fly ash particles in the ash conveying pipeline, and the pore size distribution of the filter screen is a gradual structure, with a larger pore size near the horizontal inlet and a gradually decreasing pore size near the horizontal outlet, with a pore size variation range of 10mm to 5mm, in order to improve interception efficiency and reduce the probability of clogging.

[0010] Preferably, a guide plate is provided inside the horizontal pipe of the three-way body, upstream of the large-diameter filter screen, to guide the fly ash to pass through the filter screen evenly, reduce the impact on the filter screen, and extend the service life of the filter screen.

[0011] Preferably, the guide plate is an arc-shaped guide plate with a radius of 150 mm and a length of 300 mm, tangent to the inner wall of the tee body, to optimize the flow path of fly ash; or the guide plate is a spiral guide plate with a pitch of 50 mm and a diameter of 10 mm, to guide fly ash to flow along a spiral path and reduce direct impact.

[0012] Preferably, the inner wall of the tee body is coated with a wear-resistant and corrosion-resistant coating, which is a polytetrafluoroethylene coating, to improve the service life of the device.

[0013] The working principle of this utility model is as follows: When the pressure sensor of the ash conveying pipeline displays a positive pressure alarm and the pressure gauge on site shows a positive pressure, it indicates that the ash conveying pipeline is blocked. At this time, after taking a series of safety measures such as closing the economizer silo pump outlet valve and shutting off the compressed air system, the blocking plate of the inclined outlet of this utility model can be opened, and the debris in front of the filter screen can be cleaned. If the debris is stuck and cannot be removed through the inclined tee outlet, simply remove the entire tee body from the ash conveying pipeline, clean the debris, and then reinstall it. This greatly improves the efficiency of troubleshooting and ensures the safe and stable operation of the unit.

[0014] The technical effects and advantages of this utility model are as follows:

[0015] 1. Quickly locate and clear blockages: ① This utility model features a detachable blocking plate at the angled outlet of the tee body. When the ash conveying pipeline is blocked, operators do not need to troubleshoot along the long pipeline step by step. They only need to check the tee device to quickly locate the blockage point, greatly shortening the troubleshooting time. ② The detachable design of the blocking plate makes the cleaning work simple and quick. After closing the relevant valves, operators can quickly open the blocking plate to clean the debris in front of the filter screen, or remove the entire tee device from the ash conveying pipeline for thorough cleaning, significantly improving maintenance efficiency.

[0016] 2. Improved interception efficiency and reduced clogging probability: ① The large-aperture filter screen of this utility model adopts a gradually decreasing aperture structure. The aperture is larger near the horizontal inlet and gradually decreases near the horizontal outlet. This design can effectively intercept debris of different sizes, while reducing obstruction to the normal flow of fly ash, improving interception efficiency and reducing clogging probability; ② The arc-shaped or spiral guide plate can guide fly ash to pass evenly through the filter screen, reducing direct impact on the filter screen and further reducing the risk of clogging; the streamlined design of the arc-shaped guide plate can effectively reduce eddies and local pressure concentration, while the spiral guide plate can guide fly ash to flow along the spiral path, disperse the impact force, and extend the service life of the filter screen.

[0017] 3. Enhanced reliability and durability of the tee device: ① The filter screen in this utility model is made of high-strength stainless steel, which can adapt to the high-pressure environment in the ash conveying pipeline and ensure stable performance during long-term operation. The inner wall of the tee body is coated with a wear-resistant and corrosion-resistant coating, such as polytetrafluoroethylene coating, which enhances the wear resistance and corrosion resistance of the device and extends its service life; ② Sealing gaskets are provided between the flange and the anti-flange, as well as between the flange and the plug plate, and anti-loosening washers are set. This design ensures the sealing and reliability of the connection. Even under high pressure and vibration conditions, it can effectively prevent fly ash leakage and ensure the safe operation of the system.

[0018] 4. Reduced maintenance costs and improved economic efficiency: ① The utility model can quickly locate and clear blockages, reducing unit downtime caused by pipeline blockages and avoiding economic losses due to prolonged downtime. At the same time, it eliminates the need for extensive scaffolding for inspection, significantly reducing the manpower and material costs of maintenance work; ② By optimizing the flow path of fly ash and reducing the risk of blockages, this utility model can ensure the stable operation of the ash conveying system, improve the overall operating efficiency of the thermal power plant, reduce additional maintenance costs due to equipment failures, and further enhance economic efficiency.

[0019] 5. Superior safety and stability: ① When blockage occurs in the ash conveying pipeline, this invention can respond quickly and handle the situation promptly, avoiding safety hazards caused by excessive pressure due to blockage and ensuring the safety of operators and equipment; ② By effectively intercepting debris and reducing blockage, this invention ensures the stable operation of the economizer ash conveying system, providing strong support for the safe and efficient operation of thermal power plants and enhancing the reliability and stability of the entire system. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model;

[0021] In the diagram, 1--Tee body, 2--Large aperture filter screen, 3--Blocking plate, 4--Flange, 5--Reverse flange, 6--Rubber sealing gasket, 7--Bolt. Detailed Implementation

[0022] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0023] Example 1: See Figure 1 A special tee device for preventing blockage in an economizer ash conveying pipeline includes a tee body 1, which has a horizontal inlet, a horizontal outlet, and an oblique outlet. A large-aperture filter screen 2 is installed at the horizontal outlet of the tee body 1 to intercept debris transported with fly ash. A detachable blocking plate 3 is bolted to the flange of the oblique outlet of the tee body. The blocking plate 3 is used to seal the oblique outlet and to clean debris in front of the filter screen. Flanges 4 are installed at both the inlet and outlet of the tee body, and corresponding anti-flanges 5 are installed at both the horizontal inlet and outlet flanges 4.

[0024] The flange and the anti-flange are connected by bolts 7, and a rubber sealing gasket 6 is provided at the connection to ensure sealing performance; a sealing gasket is also provided between the flange and the plug plate 3, and an anti-loosening washer (not shown in the figure, which is the prior art) is provided at the nut end of the bolt to prevent the bolt from loosening due to vibration during the ash conveying process.

[0025] The large-aperture filter screen 2 is a detachable structure, which is convenient for regular replacement or cleaning. The filter screen is made of high-strength stainless steel to adapt to the high-pressure environment in the ash conveying pipeline. The pore size of the large-aperture filter screen 2 is designed according to the size of the fly ash particles in the ash conveying pipeline, and the pore size distribution of the filter screen is a gradual structure. The pore size is larger near the horizontal inlet and gradually decreases near the horizontal outlet. The pore size variation range is 10mm to 5mm, so as to improve the interception efficiency and reduce the probability of blockage.

[0026] Inside the horizontal pipe of the three-way body, upstream of the large-diameter filter screen, there is a guide plate (not shown in the figure, which is existing technology) to guide the fly ash to pass through the filter screen evenly, reduce the impact on the filter screen, and extend the service life of the filter screen.

[0027] The guide plate is an arc-shaped guide plate with a radius of 150mm and a length of 300mm. It is tangent to the inner wall of the tee body to optimize the flow path of fly ash.

[0028] The inner wall of the tee body 1 is coated with a wear-resistant and corrosion-resistant coating, which is a polytetrafluoroethylene coating, to improve the service life of the device.

[0029] Example 2: This example is basically the same as Example 1 in structure, and the similarities will not be repeated. The difference is that the guide plate is a spiral guide plate with a pitch of 50mm and a pitch of 10mm, so as to guide the fly ash to flow along the spiral path and reduce direct impact.

[0030] The above are all preferred embodiments of this utility model, and are not intended to limit the scope of protection of this application. All equivalent changes made to the structure, shape and principle of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A special tee device for preventing blockage in economizer ash conveying pipelines, comprising a tee body, characterized in that: The tee body has a horizontal inlet, a horizontal outlet, and an oblique outlet. A large-aperture filter screen is installed at the horizontal outlet of the tee body to intercept debris transported with fly ash. A detachable blocking plate is bolted to the flange of the oblique outlet of the tee body. The blocking plate is used to seal the oblique outlet and to clean debris in front of the filter screen. Flanges are provided at both the inlet and outlet of the tee body, and the flanges of the horizontal inlet and outlet are provided with corresponding reverse flanges.

2. The economizer ash conveying pipeline anti-clogging tee device according to claim 1, characterized in that: The flange and the anti-flange are connected by bolts, and a sealing gasket is provided at the connection to ensure sealing performance; a sealing gasket is also provided between the flange and the blocking plate, and an anti-loosening washer is provided at the nut end of the bolt to prevent the bolt from loosening due to vibration during ash conveying.

3. The economizer ash conveying pipeline anti-clogging tee device according to claim 1, characterized in that: The large-aperture filter screen has a detachable structure, which facilitates regular replacement or cleaning. The filter screen is made of high-strength stainless steel to adapt to the high-pressure environment inside the ash conveying pipeline. The pore size of the large-aperture filter screen is designed according to the size of the fly ash particles in the ash conveying pipeline. The pore size distribution of the filter screen is a gradual structure, with larger pores near the horizontal inlet and gradually decreasing pores near the horizontal outlet. The pore size variation range is 10mm to 5mm, which improves interception efficiency and reduces the probability of clogging.

4. The economizer ash conveying pipeline anti-clogging tee device according to claim 1, characterized in that: A guide plate is installed inside the horizontal pipe of the main body, upstream of the large-diameter filter screen, to guide the fly ash to pass through the filter screen evenly, reduce the impact on the filter screen, and extend the service life of the filter screen.

5. The economizer ash conveying pipeline anti-clogging tee device according to claim 4, characterized in that: The guide plate is an arc-shaped guide plate with a radius of 150mm and a length of 300mm, tangent to the inner wall of the tee body to optimize the flow path of fly ash; or the guide plate is a spiral guide plate with a pitch of 50mm and a diameter of 10mm to guide fly ash to flow along a spiral path and reduce direct impact.

6. The economizer ash conveying pipeline anti-clogging tee device according to claim 1, characterized in that: The inner wall of the tee body is coated with a wear-resistant and corrosion-resistant coating, which is a polytetrafluoroethylene coating, to improve the service life of the device.

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