A kind of anti-coking dredging device for thermal power plant boiler

Abstract

The present application provides a kind of power plant boiler anti-clogging dredging device, it is related to boiler anti-clogging technical field.The device includes horizontal flue, one end is provided with air inlet, the other end is provided with exhaust port;Horizontal flue is installed with superheater and boiler drum pipeline, superheater is connected with boiler drum pipeline;The present application is by being provided with spoiler layer, so that spoiler layer is located below the top of horizontal flue, before high-temperature flue gas washes to the top end of horizontal flue, high-temperature flue gas will first pass through in the metal fiber woven spoiler layer, so that high-temperature flue gas that is upwardly impacting the top end of horizontal flue changes from concentrated impact to dispersed penetration, so that high-temperature flue gas is slowed down by spoiler, to reduce the direct scouring force of local high-speed airflow to the top end wall of horizontal flue, in addition, spoiler layer can also block coarse ash and slag in flue gas, reduce abrasive scouring of hard ash and slag particles to the top end wall, further reduce the wear of the top end of horizontal flue, improve the service life of horizontal flue.

Description

Technical Field

[0001] This invention relates to the field of boiler anti-clogging technology, and in particular to an ash removal device for preventing clogging in thermal power plant boilers. Background Technology

[0002] The boiler in a thermal power plant is one of the most important pieces of equipment. Its function is to convert the chemical energy of fuels such as pulverized coal into thermal energy, generating high-pressure steam to drive a steam turbine to generate electricity. The horizontal flue is a core component of the boiler body and a key link in the boiler flue system. It connects the furnace with the vertical flue at the tail end and is an important channel for flue gas flow and heat transfer. Because the flue gas produced by the combustion of fuels such as pulverized coal contains impurities such as fly ash, unburned carbon particles, and sulfides, during boiler operation, the high-temperature flue gas produced by fuel combustion in the boiler first enters the horizontal flue after leaving the furnace. This causes the high-temperature flue gas entering the air inlet to scour the top of the horizontal flue. This scouring not only causes wear on the material at the top of the horizontal flue, but also causes ash and slag to adhere to the worn areas. Over time, this can easily lead to blockage of the horizontal flue and poor flue gas exhaust.

[0003] In view of this, in order to overcome the above-mentioned technical problems, the present invention proposes an anti-clogging and ash-dredging device for thermal power plant boilers, which solves the above-mentioned technical problems. Summary of the Invention

[0004] The purpose of this invention is to provide a device for preventing ash blockage and clearing blockage in boilers of thermal power plants. This device can set up a turbulence layer in the horizontal flue, which changes the concentrated impact of the high-temperature flue gas impacting the top of the flue to a dispersed penetration, so that the high-temperature flue gas is slowed down by the turbulence, reducing the direct scouring force of the local high-speed airflow on the top wall of the horizontal flue. In addition, the turbulence layer can also block coarse ash particles in the flue gas, reduce the abrasive scouring of hard ash particles on the top wall, further reduce the wear of the top of the horizontal flue, and improve the service life of the horizontal flue.

[0005] This invention provides a device for preventing ash blockage and clearing blockage in a thermal power plant boiler, comprising: a horizontal flue with a hollow cavity, an air inlet at one end of the horizontal flue and an exhaust outlet at the other end; a superheater and a boiler drum pipe connected thereto are installed near the air inlet end of the horizontal flue; a strip groove is formed on the top wall of the horizontal flue; an installation plate is provided above the superheater; the top of the installation plate is slidably installed in the strip groove; a turbulence layer is provided on one side of the installation plate, the turbulence layer being woven from metal fibers to turbulently slow down the high-temperature flue gas; a connecting plate is fixedly installed on the other side of the installation plate, and a scraper is provided at the top of the connecting plate.

[0006] Preferably, a lead screw capable of rotating relative to the slot is installed in the slot, a stepper motor for driving the lead screw to rotate is installed on the outer wall of one end of the horizontal flue, and the mounting plate is threadedly connected to the lead screw.

[0007] Preferably, the top wall of the horizontal flue has an installation groove communicating with the strip groove, and a steel strip that can slide relative to it is provided in the installation groove. One side of the installation plate is fixedly connected to the steel strip. A circular groove communicating with the installation groove is provided on the inner wall of one end of the horizontal flue. A winding rod is provided in the circular groove. The winding rod is connected to the inner wall of the circular groove through a coil spring. The winding rod is connected to the steel strip and can wind it up.

[0008] Preferably, a support rod is fixed on the inner wall of the horizontal flue to support the piping of the superheater.

[0009] Preferably, a mounting rod rotatably connected to the steel strip is provided on one side of the mounting plate, the turbulence layer is wrapped around the surface of the mounting rod, and one end of the turbulence layer is connected to the inner wall of the horizontal flue.

[0010] Preferably, a rotatable spur gear is provided in the strip groove, the spur gear is fixed to one end of the mounting rod, and a toothed groove is formed at the bottom of the strip groove, with the spur gear meshing with the toothed groove.

[0011] Preferably, the scraper has a groove at its bottom, the top of the connecting plate is slidably installed in the groove, and the top of the connecting plate is connected to the bottom of the groove by a spring. The bottom of the connecting plate is provided with a dust baffle, and the dust baffle is rotatably connected to the connecting plate by a torsion spring. A roller is rotatably connected to the end of the dust baffle away from the connecting plate, and the roller is made of ceramic material.

[0012] Preferably, the scraper has a slot on the side near the mounting plate, and an insert plate is slidably inserted into the slot, with the top of the insert plate contacting the top wall of the horizontal flue.

[0013] Preferably, a support groove is provided at one end of the scraper, a support rod is slidably installed in the support groove, the support rod is connected to the bottom of the support groove by a support spring, and the support rod is connected to the insert plate by a transmission assembly.

[0014] Preferably, the transmission assembly includes a transmission gear, the bottom of the insert plate is provided with teeth, the transmission gear is rotatably mounted in the scraper, and a rack is provided on one side of the support rod, and the transmission gear meshes with the rack and the teeth simultaneously for transmission.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. By setting up a turbulence layer located below the top of the horizontal flue, the high-temperature flue gas passes through the woven metal fiber turbulence layer before reaching the top of the horizontal flue. This changes the concentrated impact of the high-temperature flue gas on the top of the horizontal flue into a dispersed penetration, slowing down the high-temperature flue gas and reducing the direct scouring force of the local high-speed airflow on the top wall of the horizontal flue. In addition, the turbulence layer can also block coarse ash particles in the flue gas, reducing the abrasive scouring of hard ash particles on the top wall, further reducing the wear on the top of the horizontal flue and improving the service life of the horizontal flue. 2. By installing a scraper, when the mounting plate is moved by external force, the mounting plate can drive the connecting plate and the scraper to move synchronously. During the movement, the scraper can scrape off the ash and slag adhering to the top of the horizontal flue. On the one hand, this reduces the corrosion of the top of the horizontal flue caused by ash and slag, and improves the service life of the horizontal flue. On the other hand, it prevents ash and slag from sticking together for a long time and forming large slag clumps, thereby preventing large ash and slag clumps from falling off and damaging the equipment below, so as to ensure that the boiler can operate normally and stably. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a cross-sectional structural diagram of the present invention; Figure 3 This is a partial cross-sectional structural diagram of the present invention; Figure 4 This is the present invention. Figure 2 Enlarged view of point A in the middle; Figure 5 This is the present invention. Figure 3 Enlarged view at point B in the middle; Figure 6 This is the present invention. Figure 3 Enlarged view at point C; Figure 7 This is a partial cross-sectional structural diagram of the scraper section of the present invention; Figure 8 yes Figure 7 Enlarged view of point D in the middle; Figure 9 This is a partial cross-sectional structural diagram of the scraper from another perspective of the present invention. Explanation of reference numerals in the attached figures: 1. Horizontal flue; 11. Air inlet; 12. Exhaust outlet; 13. Superheater; 14. Boiler drum piping; 15. Support rod; 16. Strip groove; 161. Lead screw; 17. Stepper motor; 2. Mounting plate; 21. Mounting groove; 211. Steel strip; 22. Circular groove; 221. Winding rod; 222. Coil spring; 23. Mounting rod; 231. Turbine layer; 232. Spur gear; 233. Gear groove; 24. Connecting plate; 25. Scraper; 251. Groove; 252. Connecting spring; 26. Ash baffle; 261. Roller; 3. Slot; 31. Insert plate; 32. Support groove; 33. Support rod; 331. Support spring; 332. Transmission gear; 34. Rack; 35. Tooth. Detailed Implementation

[0018] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they may refer to a fixed connection, a detachable connection, or an integral connection; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection through an intermediate medium; and they may refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0021] like Figure 1-9As shown, this invention provides an anti-clogging and ash-clearing device for a thermal power plant boiler, comprising: a horizontal flue 1 with a hollow cavity, an air inlet 11 at one end of the horizontal flue 1 for inletting flue gas, and an exhaust outlet 12 at the other end for exhausting flue gas. A superheater 13 and a boiler drum pipeline 14 connected to it are installed near the air inlet 11 within the horizontal flue 1. These two components work together to heat the saturated steam generated by the boiler drum into superheated steam, which is then safely delivered to the turbine to improve thermal efficiency, protect equipment, and optimize system operation. Support rods 15 are fixed to the inner wall of the horizontal flue 1 to support the pipeline of the superheater 13. A strip groove 16 is provided on the top wall of the horizontal flue 1. An installation plate 2 is provided above the superheater 13. The top of the installation plate 2 is slidably installed in the strip groove 16. A turbulence layer 231 is provided on one side of the installation plate 2. The turbulence layer 231 is woven from metal fibers, which changes the high-temperature flue gas impacting the top of the horizontal flue from a concentrated impact to a dispersed penetration. This turbulence slows down the high-temperature flue gas, thereby reducing the direct scouring force of the local high-speed airflow on the top wall of the horizontal flue. In addition, the turbulence layer 231 can also block coarse ash particles in the flue gas, reduce the abrasive scouring of hard ash particles on the top wall, further reduce the wear of the top of the horizontal flue 1, and improve the service life of the horizontal flue 1. A connecting plate 24 is fixedly installed on the other side of the mounting plate 2. A scraper 25 is provided at the top of the connecting plate 24. The mounting plate can drive the connecting plate 24 and the scraper 25 to move synchronously, so that the scraper 25 can scrape off the ash and slag adhering to the top of the horizontal flue 1 during the movement. On the one hand, it reduces the corrosion of the top of the horizontal flue 1 caused by the ash and slag, and improves the service life of the horizontal flue 1. On the other hand, it avoids the long-term adhesion of ash and slag and the formation of large slag clumps, thereby preventing large ash and slag clumps from falling off and damaging the equipment below, so as to ensure that the boiler can operate normally and stably.

[0022] Specifically, a lead screw 161 capable of rotating relative to the slot 16 is installed inside the slot 16, and a stepper motor 17 for driving the lead screw 161 to rotate is installed on the outer wall of one end of the horizontal flue 1. The mounting plate 2 is threadedly connected to the lead screw 161, and the lead screw 162 is driven to rotate by the stepper motor 17, which can drive the mounting plate 2 to move along the slot 16.

[0023] A mounting groove 21 communicating with a strip groove 16 is provided on the top wall of the horizontal flue 1. A steel strip 211 that can slide relative to the mounting groove 21 is provided in the mounting groove 21. One side of the mounting plate 2 is fixedly connected to the steel strip 211. Moving the mounting plate 2 can drive the steel strip 211 to move together. A circular groove 22 communicating with the mounting groove 21 is provided on the inner wall of one end of the horizontal flue 1. A winding rod 221 is provided in the circular groove 22. The winding rod 221 is connected to the inner wall of the circular groove 22 through a coil spring 222. The winding rod 221 is connected to the steel strip 211 and can wind it up. A mounting rod 23 that is rotatably connected to the steel strip 211 is provided on one side of the mounting plate 2. A turbulence layer 231 is wound around the surface of the mounting rod 23. One end of the turbulence layer 231 is connected to the inner wall of the horizontal flue 1.

[0024] In this embodiment, a rotatable spur gear 232 is provided in the strip groove 16. The spur gear 232 is fixed to one end of the mounting rod 23. A toothed groove 233 is provided at the bottom of the strip groove 16, and the spur gear 232 meshes with the toothed groove 233.

[0025] During operation, as pulverized coal and other fuels burn in the furnace, the high-temperature flue gas generated by the combustion enters the air inlet 11 of the horizontal flue 1 from the upper end of the furnace. This causes the high-temperature flue gas entering the air inlet 11 to wash over the top of the horizontal flue 1, resulting in wear on the material at the top of the horizontal flue 1.

[0026] To address the aforementioned issues, this invention incorporates a turbulence layer 231 located below the top of the horizontal flue 1. Before the high-temperature flue gas reaches the top of the horizontal flue 1, it passes through the metal fiber-woven turbulence layer 231, transforming the concentrated impact of the high-temperature flue gas on the top of the horizontal flue 1 into a dispersed penetration. The high-temperature flue gas is slowed down by the turbulence, thereby reducing the direct scouring force of the local high-speed airflow on the top wall of the horizontal flue 1. Furthermore, the turbulence layer 231 can also block coarse ash particles in the flue gas, reducing the abrasive scouring of the top wall by hard ash particles, further reducing wear on the top of the horizontal flue 1 and improving its service life.

[0027] In use, since the horizontal flue 1 is installed at the upper end of the furnace, the air inlet 11 of the horizontal flue 1 is connected to the upper port of the furnace, while the exhaust port 12 of the horizontal flue 1 is connected to the dust removal system through the tail vertical flue. When the boiler is running, pulverized coal and other fuels are burned in the furnace. The high-temperature flue gas generated by the combustion enters the air inlet 11 of the horizontal flue 1 from the upper port of the furnace. The high-temperature flue gas entering the air inlet 11 will wash over the top of the horizontal flue 1. At this time, the high-temperature flue gas blocked by the top of the horizontal flue 1 will flow along the horizontal flue 1 towards the exhaust port 12. The high-temperature flue gas will flow through the exhaust port 12 of the horizontal flue 1 into the vertical flue connected to the exhaust port 12 of the horizontal flue 1. The high-temperature flue gas will then flow into the dust removal system through the vertical flue. The dust removal system filters and collects the ash and slag in the high-temperature flue gas.

[0028] Since a superheater 13 and a boiler drum pipe 14 are installed inside the horizontal flue 1, and the superheater 13 is installed at the end of the horizontal flue 1 near the air inlet 11, and the boiler drum pipe 14 is connected to the boiler drum and the steam turbine, that is, the boiler drum delivers saturated steam to the superheater 13 through the boiler drum pipe 14, when the high-temperature flue gas enters the air inlet 11, it first comes into contact with the superheater 13, so that the saturated steam in the superheater 13 undergoes convective heat exchange and radiative heat exchange with the high-temperature flue gas in the horizontal flue 1. The saturated steam is heated into superheated steam. As the boiler drum pipe 14 continuously delivers saturated steam into the superheater 13, the superheated steam in the superheater 13 is pushed by the saturated steam from the boiler drum pipe 14 to the steam turbine. The steam turbine converts thermal energy into mechanical energy, thereby driving the generator to generate electricity.

[0029] Initially, two sets of circular grooves 22 are provided, distributed at both ends of the mounting groove 21. When the mounting plate 2 is located near the end of the lead screw 161 close to the stepper motor 17, the coil spring 222 in the circular groove 22 away from the mounting plate 2 is in a stretched state. When the stepper motor 17 drives the mounting plate 2 away from the stepper motor 17, the mounting plate 2 drives the steel strip 211 connected to it to move continuously along the mounting groove 21 away from the stepper motor 17, so that the surface of the winding rod 221 near the stepper motor 17... The steel strip 211 is continuously released, while the winding rod 221, which is away from the mounting plate 2, rotates continuously under the elastic restoring force of the coil spring 222. This causes the steel strip 211 in the mounting groove 21 to continuously wrap around the surface of the winding rod 221, which is away from the stepper motor 17. This ensures that the steel strip 211 continuously blocks the strip groove 16, preventing ash and slag from entering the strip groove 16 and adhering to the surface of the lead screw 161. This prevents the ash and slag from affecting the normal transmission between the lead screw 161 and the mounting plate 2, thereby ensuring that the present invention can operate normally and stably.

[0030] When high-temperature flue gas enters the inlet 11 of the horizontal flue 1 and impacts the top of the horizontal flue 1, some ash and slag in the high-temperature flue gas will adhere to the top of the horizontal flue 1. Therefore, before the boiler is started, the stepper motor 17 is controlled to drive the lead screw 161 to rotate, so that the lead screw 161 drives the mounting plate 2 connected to it to move the steel belt 211 away from the stepper motor 17. At this time, the mounting rod 23 on one side of the mounting plate 2 can move synchronously with the steel belt 211. Since a spur gear 232 is provided at one end of the mounting rod 23, the spur gear 232 moves synchronously with the mounting rod 23. Since the lower end face of the strip groove 16 has a tooth groove 233 that meshes with the spur gear 232, when the mounting rod 23 drives the spur gear 232 to move, the spur gear 232 rolls in the tooth groove 233, so that the spur gear 232 drives the mounting rod 23 to rotate, so that the turbulence layer 231 wrapped around the surface of the rotating mounting rod 23 is released, thereby making the turbulence... Layer 231 shields the top of the horizontal flue 1. By setting a spur gear 232 and a toothed groove 233, on the one hand, when the mounting rod 23 drives the spur gear 232 to move, the spur gear 232 can roll under the obstruction of the inner wall of the toothed groove 233, so that the spur gear 232 drives the mounting rod 23 to rotate, thereby releasing the turbulence layer 231. On the other hand, when the stepper motor 17 stops rotating, the toothed groove 233 can mechanically block the spur gear 232, realizing the mechanical self-locking of the mounting rod 23, preventing the extended turbulence layer 231 from pulling the mounting rod 23 to rotate under its own gravity, thus ensuring that the turbulence layer 231 can remain taut. This allows the turbulence layer 231, which is made of metal fiber, to stably block and turbulent the high-temperature flue gas, changing the high-temperature flue gas from concentrated impact to dispersed penetration, thereby reducing the direct scouring force of the local high-speed airflow on the top wall of the horizontal flue 1, reducing the wear on the top of the horizontal flue 1, and improving the service life of the horizontal flue 1.

[0031] In this embodiment, the scraper 25 has a groove 251 at its bottom, the top of the connecting plate 24 is slidably installed in the groove 251, and the top of the connecting plate 24 is connected to the bottom of the groove 251 by a connecting spring 252. The bottom of the connecting plate 24 is provided with a dust baffle 26, and the dust baffle 26 is rotatably connected to the connecting plate 24 by a torsion spring. The end of the dust baffle 26 away from the connecting plate 24 is rotatably connected to a roller 261, which is made of ceramic material.

[0032] During operation, when the ash and slag carried in the high-temperature flue gas adhere to the top of the horizontal flue 1, the sulfides and alkali metals in the ash and slag will undergo a high-temperature corrosion reaction with the inner wall metal of the horizontal flue 1. For example, sulfides will cause the formation of a loose corrosion layer on the metal surface; while alkali metals will destroy the metal oxide film through penetration, accelerating intergranular corrosion. This corrosion process will significantly reduce the strength of the inner wall material, thereby aggravating the vicious cycle of ash and slag deposition and wear. On the other hand, long-term adhesion of ash and slag is prone to forming large slag clumps. If large ash and slag clumps suddenly fall off, they will damage the equipment below, causing high-temperature flue gas to overflow, and causing problems such as fire or burns to personnel.

[0033] By setting up a scraper 25, the present invention enables the mounting plate 2 to move synchronously when the stepper motor 17 drives the mounting plate 2 to move via the lead screw 161. This allows the mounting plate 2 to drive the connecting plate 24 and the scraper 25 to move synchronously, so that the scraper 25 can scrape off the ash and slag adhering to the top of the horizontal flue 1 during the movement. This reduces the corrosion of the top of the horizontal flue 1 caused by the ash and slag, thus improving the service life of the horizontal flue 1. On the other hand, it prevents the ash and slag from sticking together for a long time and forming large clumps of slag, thereby preventing large clumps of ash and slag from falling off and damaging the equipment below, thus ensuring the normal and stable operation of the boiler.

[0034] Before the boiler is started, the mounting plate 2 is located at the end of the lead screw 161 close to the stepper motor 17. At this time, the user first controls the stepper motor 17 to run, so that the stepper motor 17 can drive the lead screw 161 connected to it to rotate. Since the mounting plate 2 and the lead screw 161 are connected by a threaded transmission, the rotating lead screw 161 can drive the mounting plate 2 to move away from the stepper motor 17, thereby driving the scraper 25 to move.

[0035] After the boiler has been running for a period of time, the stepper motor 17 drives the lead screw 161 to rotate in the reverse direction, so that the lead screw 161 can drive the mounting plate 2, which is threaded to it, to move closer to the stepper motor 17. This causes the mounting plate 2 to drive the connecting plate 24 to move closer to the stepper motor 17. Since the upper end of the connecting plate 24 is inserted into the groove 251 at the lower end of the scraper 25, and the upper end of the connecting plate 24 is connected to the bottom of the groove 251 through the connecting spring 252, the scraper 25 is pushed by the restoring force of the connecting spring 252 and pressed tightly against the top of the horizontal flue 1. When the mounting plate 2 drives the connecting plate 24 to move... When the connecting plate 24 moves synchronously with the upper scraper 25, the scraper 25 scrapes off the ash and slag adhering to the top of the horizontal flue 1. Since the connecting plate 24 is equipped with a baffle plate 26 at the lower end, the ash and slag scraped off by the scraper 25 will fall into the upper surface of the baffle plate 26, preventing the ash and slag from falling to the bottom of the flue or onto the superheater 13 pipe. This prevents the bottom of the flue from being blocked by the falling and accumulation of ash and slag. Since the ash and slag are hard particles, the ash and slag received by the baffle plate 26 will not directly hit the superheater 13 pipe below, reducing wear on the inner wall of the superheater 13 pipe and improving the service life of the superheater 13 pipe.

[0036] As the stepper motor 17 continuously drives the mounting plate 2 and the connecting plate 24 to move closer to the stepper motor 17, the connecting plate 24 drives the lower ash baffle 26 to move synchronously until the ash baffle 26 contacts the inner wall of the horizontal flue 1. This causes the roller 261 at one end of the ash baffle 26 to first contact the inner wall of the horizontal flue 1. The roller 261 is blocked by the inner wall of the horizontal flue 1, and under the action of the blocking force, it drives the ash baffle 26 connected to it to rotate upward. At this time, the roller 261 rolls upward with the inner wall of the horizontal flue 1, causing the ash baffle 26 to overcome the torsion of the torsion spring and tilt upward. During the upward tilting process of the ash baffle 26, the ash and slag received at the upper end of the ash baffle 26 will fall from the gap between the ash baffle 26 and the connecting plate 24, causing the ash and slag received by the ash baffle 26 to fall to the exhaust port 12 of the horizontal flue 1, and then fall to the tail vertical flue, and finally be collected by the dust removal system.

[0037] By incorporating rollers 261, the ash baffle 26 rolls against the inner wall of the horizontal flue 1, reducing friction and wear, thus extending its service life. The rollers 261 are made of ceramic, improving surface smoothness, reducing friction, and enhancing heat resistance, preventing deformation under high temperatures and ensuring proper function. Both the torsion spring and connecting spring 252 are made of nickel-based high-temperature alloy, ensuring stable operation within the high-temperature environment of the horizontal flue 1.

[0038] In this embodiment, a slot 3 is provided on the side of the scraper 25 near the mounting plate 2, and an insert plate 31 is slidably inserted into the slot 3, with the top of the insert plate 31 contacting the top wall of the horizontal flue 1. A support groove 32 is provided at one end of the scraper 25, and a support rod 33 is slidably installed in the support groove 32. The support rod 33 is connected to the bottom of the support groove 32 by a support spring 331, and the support rod 33 is connected to the insert plate 31 by a transmission assembly.

[0039] Specifically, the transmission assembly includes a transmission gear 332, teeth 35 are provided at the bottom of the insert plate 31, the transmission gear 332 is rotatably installed in the scraper 25, a rack 34 is provided on one side of the support rod 33, the transmission gear 332 meshes with the rack 34 and teeth 35 simultaneously, and the upper end surface of the support rod 33 is set as a curved surface.

[0040] During operation, if the alkali metal content in the pulverized coal is too high, the alkali metal in the pulverized coal will melt during combustion and, driven by the ash, wash over the top of the horizontal flue 1. This causes the molten alkali metal and ash to adhere to the top of the horizontal flue 1 and form glassy coke blocks. The glassy coke blocks have high hardness, making it difficult for the scraper 25 to scrape them off. By setting the insert plate 31, the upper end face of the insert plate 31 contacts the top of the horizontal flue 1, and the height of the upper end face of the insert plate 31 is greater than the height of the upper end face of the scraper 25. Therefore, when the stepper motor 17 drives the mounting plate 2 to move the scraper 25, the scraper 25 moves the insert plate 31, causing the insert plate 31 to scrape off the ash at the top of the horizontal flue 1, while the upper end face of the scraper 25 does not contact the top of the horizontal flue 1. When the scraper 25 moves the insert plate 31 to the glassy coke block, the glassy coke block blocks the insert plate 31, causing the insert plate 31 to extend out of the slot 3 under the blocking force of the glassy coke block. Since the insert plate 31 meshes with the transmission gear 332 through the lower teeth 35, and the transmission gear 332 meshes with the rack 34, when the insert plate 31 extends out of the slot 3 and moves synchronously with the lower teeth 35, the insert plate 31 will push the transmission gear 332 to rotate through the lower teeth 35. The rotating transmission gear 332 can drive the rack 34 meshing with it to move upward, so that the rack 34 drives the support rod 33 fixed to it to rise. The rising support rod 33 stretches the support spring 331 and extends out of the support groove 32. Its upper curved end contacts the top of the horizontal flue 1. Since the upper surface of the support rod 33 is set as a curved surface, it makes point contact with the horizontal flue 1, which reduces the friction between the support rod 33 and the horizontal flue 1 and improves the service life of the support rod 33.

[0041] When the support rod 33 contacts the horizontal flue 1, the horizontal flue 1 blocks the support rod 33, causing the support rod 33 to stop driving the rack 34 to rise. As the transmission gear 332 continues to rotate, the transmission gear 332 rolls downward relative to the rack 34, causing the transmission gear 332 to drive the scraper 25 to descend. This causes the connecting plate 24 below the scraper 25 to squeeze the connecting spring 252 into the groove 251, allowing the descending scraper 25 to drive the insert plate 31 to descend. This causes the upper surface of the insert plate 31 to move away from the top of the horizontal flue 1, and the descending insert plate 31 slides up and down with the glassy coke block.

[0042] When the descending insert plate 31 passes the glassy coke block, it is no longer obstructed. At this time, the support spring 331, under its own restoring force, pulls the support rod 33 down and into the support groove 32, allowing the support rod 33 to drive the rack 34 embedded on one side to descend synchronously. Meanwhile, the scraper 25, pushed by the connecting spring 252, continuously approaches the horizontal flue 1, causing the scraper 25 to drive the insert plate 31 up. The rising scraper 25 can slide into contact with the lower end face of the glassy coke block. When the support spring 331 pulls the support rod 33 down, the descending support rod 33 pushes the transmission gear 33 meshing with it through the rack 34. 2. Reverse rotation: the transmission gear 332 can drive the insert plate 31 to reset through the teeth 35 until the insert plate 31 completely passes over the glassy coke. At this time, the insert plate 31 is no longer blocked by the glassy coke. The scraper 25, pushed by the connecting spring 252, drives the insert plate 31 to contact the top of the horizontal flue 1, so that the insert plate 31 can clean the ash and slag at the top of the horizontal flue 1 again. This avoids the problem of the insert plate 31 getting stuck, worn, or even bent and deformed due to the obstruction of the high-hardness glassy coke. This not only improves the service life of the insert plate 31, but also ensures that the insert plate 31 can perform long-term stable cleaning of the ash and slag at the top of the horizontal flue 1.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A device for preventing ash blockage and clearing blockage in a thermal power plant boiler, characterized in that, include: A horizontal flue (1) with a hollow cavity is provided. An air inlet (11) is provided at one end of the horizontal flue (1) and an exhaust outlet (12) is provided at the other end. A superheater (13) and a boiler drum pipe (14) connected to it are installed at one end of the horizontal flue (1) near the air inlet (11). A strip groove (16) is provided on the top wall of the horizontal flue (1). An installation plate (2) is provided above the superheater (13). The top of the installation plate (2) is slidably installed in the strip groove (16). A turbulence layer (231) is provided on one side of the installation plate (2). The turbulence layer (231) is woven from metal fibers and is used to turbulent and decelerate the high-temperature flue gas. A connecting plate (24) is fixedly installed on the other side of the installation plate (2). A scraper (25) is provided at the top of the connecting plate (24).

2. The ash-blocking and unblocking device for thermal power plant boilers according to claim 1, characterized in that, A lead screw (161) capable of rotating relative to the groove (16) is installed inside the groove. A stepper motor (17) for driving the lead screw (161) to rotate is installed on the outer wall of one end of the horizontal flue (1). The mounting plate (2) is threadedly connected to the lead screw (161).

3. The ash-blocking and unblocking device for thermal power plant boilers according to claim 1, characterized in that, The horizontal flue (1) has an installation groove (21) on its top wall that communicates with the strip groove (16). A steel strip (211) that can slide relative to the installation groove (21) is provided in the installation groove (21). One side of the installation plate (2) is fixedly connected to the steel strip (211). A circular groove (22) that communicates with the installation groove (21) is provided on the inner wall of one end of the horizontal flue (1). A winding rod (221) is provided in the circular groove (22). The winding rod (221) is connected to the inner wall of the circular groove (22) through a coil spring (222). The winding rod (221) is connected to the steel strip (211) and can be wound up.

4. The ash-blocking and unblocking device for thermal power plant boilers according to claim 1, characterized in that, A support rod (15) is fixed on the inner wall of the horizontal flue (1) to support the pipeline of the superheater (13).

5. The ash-blocking and unblocking device for thermal power plant boilers according to claim 3, characterized in that, The mounting plate (2) is provided with a mounting rod (23) that is rotatably connected to the steel strip (211) on one side. The turbulence layer (231) is wrapped around the surface of the mounting rod (23), and one end of the turbulence layer (231) is connected to the inner wall of the horizontal flue (1).

6. The ash-blocking and unblocking device for thermal power plant boilers according to claim 5, characterized in that, A rotatable spur gear (232) is provided in the strip groove (16). The spur gear (232) is fixed to one end of the mounting rod (23). A toothed groove (233) is provided at the bottom of the strip groove (16). The spur gear (232) meshes with the toothed groove (233).

7. The ash-blocking and unblocking device for thermal power plant boilers according to claim 1, characterized in that, The scraper (25) has a groove (251) at its bottom. The top of the connecting plate (24) is slidably installed in the groove (251). The top of the connecting plate (24) is connected to the bottom of the groove (251) by a connecting spring (252). The bottom of the connecting plate (24) is provided with a dust baffle (26). The dust baffle (26) and the connecting plate (24) are rotatably connected by a torsion spring. A roller (261) is rotatably connected to the end of the dust baffle (26) away from the connecting plate (24). The roller (261) is made of ceramic material.

8. The ash-blocking and unblocking device for thermal power plant boilers according to claim 7, characterized in that, The scraper (25) has a slot (3) on the side near the mounting plate (2), and a plate (31) is slidably inserted into the slot (3). The top of the plate (31) is in contact with the top wall of the horizontal flue (1).

9. The ash-blocking and unblocking device for thermal power plant boilers according to claim 8, characterized in that, The scraper (25) has a support groove (32) at one end, and a support rod (33) is slidably installed in the support groove (32). The support rod (33) is connected to the bottom of the support groove (32) by a support spring (331), and the support rod (33) is connected to the insert plate (31) by a transmission assembly.

10. The ash-blocking and unblocking device for thermal power plant boilers according to claim 9, characterized in that, The transmission assembly includes a transmission gear (332), and the bottom of the insert plate (31) is provided with teeth (35). The transmission gear (332) is rotatably installed in the scraper (25). A rack (34) is provided on one side of the support rod (33). The transmission gear (332), the rack (34), and the teeth (35) mesh and transmit power simultaneously.

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