A water-cooled vibrating grate boiler tail flue gas purification treatment device and method

Abstract

The application relates to a water-cooled vibrating grate boiler tail flue gas purification treatment device and method, relates to the dust removal technical field and comprises a dust removal mechanism, an exhaust mechanism, a slag conveyor and a feeding mechanism. Dust is sent into the boiler slag conveyor, the dust is wetted by water or mixed into slag slurry, dust raising is inhibited, the wet treatment reduces the spontaneous combustion or explosion risk, even if the dust is accumulated at the lower end of the main pipe and is difficult to enter the water, the water injection assembly in the feeding mechanism can be used for water injection on the side surface and the top of the accumulated dust in the main pipe, the dust is wetted, the accumulated dust is quickly made to enter the water, the dust discharge rate is ensured, the dust removal mechanism and the exhaust mechanism are matched, the dust is slightly accumulated at the lower end of the box body, the circular roller provided with a material groove is used for dust discharge, the accumulated dust is used for avoiding flue gas discharge from the lower end, dust removal during the dust removal process can still be carried out, and the working efficiency of the device is improved.

Description

Technical Field

[0001] This application relates to the field of dust removal technology, and in particular to a device and method for purifying and treating flue gas at the tail end of a water-cooled vibrating grate boiler. Background Technology

[0002] Water-cooled vibrating grate boilers use biomass fuel, which has a complex composition containing nitrogen, sulfur, and other elements. Combustion of this fuel emits large amounts of harmful substances such as nitrogen oxides, sulfides, and soot, which not only pollute the environment but also cause certain harm to human health. Therefore, flue gas treatment is required for the equipment. The process first requires the treatment of dust in the flue gas, which necessitates the use of a multi-tube dust collector.

[0003] Patent CN117504503A discloses an environmentally friendly multi-tube dust collector. In this prior art, a spray unit is installed inside the cyclone. The spraying causes the fine particles of light dust to agglomerate into larger particles, thereby increasing the weight of the dust particles and improving the centrifugal separation effect when the air and dust rotate. At the same time, it prevents the light dust from flowing upward with the separated and purified gas to form an upward vortex and be discharged, thus improving the dust removal effect of the dust collector.

[0004] However, the aforementioned existing technologies have the following technical defects:

[0005] First, the existing technology removes dust from the flue gas and discharges it directly from the output end of the integrated box. Direct dust discharge will cause dust to fly around, pollute the environment, and some dust is flammable. Direct discharge may cause a re-ignition, which may cause a fire in the factory area in severe cases.

[0006] Second, in the existing technology, the dust removal process of the integrated box must be stopped to prevent the flue gas from being discharged from the lower port of the integrated box. As a result, the device cannot work during the dust removal process, which reduces the working efficiency of the device.

[0007] In summary, the existing technology still has room for improvement in reducing the harm of direct dust emissions and increasing work efficiency. Therefore, those skilled in the art have proposed a device for discharging dust into a slag remover and for removing dust during the dust removal process. Summary of the Invention

[0008] To address the aforementioned problems, firstly, this application provides a water-cooled vibrating grate boiler tail gas purification and treatment device, employing the following technical solution:

[0009] It includes a dust removal mechanism and an exhaust mechanism. The dust removal mechanism includes a box with two conical funnels on the lower side. A circular roller is rotatably installed at the funnel port of each box. Multiple evenly distributed material troughs are opened on the side of the circular roller. A three-way ash chute is installed at the two lower ports of the box. A material level gauge is installed above each circular roller inside the box. A slag remover is installed below the three-way ash chute.

[0010] The exhaust mechanism includes an exhaust pipe installed at the center of the upper side of the housing, with an impeller rotatably installed inside the exhaust pipe. The exhaust mechanism also includes a transmission assembly, which is used to drive all the rollers to rotate via the impeller.

[0011] It also includes a feeding mechanism, which includes a main pipe fitted onto the lower end of the three-way ash chute, an electric cylinder installed on the side of the box, and a U-shaped frame connected to the main pipe at the lower end of the electric cylinder.

[0012] The feeding mechanism also includes a water injection component, which injects water into the main pipe during the extension and retraction of the electric cylinder.

[0013] Preferably, a rotating rod is installed on both rollers, and a motor with its drive end connected to one end of the rotating rod is installed on the side of the housing near the bottom. Inside the housing, a set of guide plates is installed above each roller.

[0014] Preferably, the inner wall of the box is equipped with partitions and fixing plates arranged vertically. Multiple evenly distributed cyclones are installed on the fixing plates. A guide is provided at the upper end of each cyclone, and an exhaust straight pipe is provided inside the cyclone, passing through the guide and extending to the top of the partition.

[0015] Preferably, the transmission assembly includes a rectangular housing disposed above the impeller, and a transmission rod rotatably mounted on the side of the rectangular housing, the end of which extends to the outside of the exhaust pipe and is belt-connected to the rotating rod. The ends of the rotating shafts of the impeller and the transmission rod both extend into the rectangular housing and are fitted with meshing bevel teeth.

[0016] Preferably, multiple evenly distributed secondary pipes with their lower ends connected to the housing are installed on the side of the exhaust pipe above the rectangular shell. A baffle is provided at the lower end of the secondary pipe to match it. When the baffle rises to be in close contact with the lower end of the secondary pipe, it is closed.

[0017] Preferably, a connecting rod extending to the outside of the box is installed on the upper side of the baffle, and an annular plate is installed on the upper end of all the connecting rods. Multiple evenly distributed springs are connected between the annular plate and the box.

[0018] Preferably, a vertical frame with its upper end connected to an annular plate is slidably provided on the side of the housing, and an L-shaped plate is installed on the side of the U-shaped frame below the vertical frame. The extension and retraction of the electric cylinder drives the annular plate to rise and fall through the L-shaped plate and the vertical frame.

[0019] Preferably, the water injection mechanism includes an annular seat installed on the side of the main pipe, a connecting ring rotatably mounted on the side of the annular seat and connected to the lower end of the U-shaped frame, and multiple evenly distributed vertical cylinders installed on the lower side of the annular seat, with a connecting pipe connected to the main pipe at the upper end installed on the side of the vertical cylinder near the lower end.

[0020] Preferably, a circular hole is provided at the center of the lower end of the vertical cylinder, and two movable rods inside the vertical cylinder are symmetrically installed at the port of the circular hole. A circular plate is slidably installed on the movable rod, and a piston is slidably installed inside the vertical cylinder. A connecting frame extending to the outside of the vertical cylinder is installed on the upper side of the piston, and a connecting ring 2 is installed on the upper end of the connecting frame, which is sleeved on the side of the three-way ash chute and rotatably connected to it.

[0021] On the other hand, this application also discloses a method for purifying flue gas at the tail end of a water-cooled vibrating grate boiler: the method includes the following steps:

[0022] S1. Flue gas dust removal: Dust removal is performed on the flue gas at the tail end of a water-cooled vibrating grate boiler using a dust removal mechanism.

[0023] S2. Dust treatment: The dust is sent into the slag remover for treatment.

[0024] S3. Accumulation treatment: When dust accumulates in the main pipe, the feeding mechanism is used to accelerate its entry into the water of the slag remover.

[0025] S4. Speed ​​adjustment: Reduce the speed of the rotating rod during the process of removing dust accumulated inside the main pipe.

[0026] In summary, this application includes at least one of the following beneficial technical effects of a water-cooled vibrating grate boiler tail gas purification treatment device and method:

[0027] I. This application introduces dust into the water of the boiler slag remover, where the dust is moistened or mixed into slurry, suppressing dust emission. At the same time, wet treatment reduces the risk of spontaneous combustion or explosion. Even if the dust accumulates at the lower port of the main pipe and is difficult to enter the water, the water injection component in the feeding mechanism can be used to inject water into the sides and top of the dust accumulation in the main pipe, wetting the dust and allowing the accumulated dust to quickly enter the water, ensuring the dust discharge rate.

[0028] Second, this application utilizes a combination of dust removal and exhaust mechanisms to allow dust to accumulate in small amounts at the lower port of the housing. A circular roller with a feed trough is then used to remove the dust, preventing flue gas from escaping from the lower port. This allows for dust removal operations to continue during the dust removal process, improving the device's efficiency. Simultaneously, the exhaust gas powers the rotation of the circular roller, eliminating the need for an additional power source and reducing resource consumption. Furthermore, while the feeding mechanism processes the dust accumulated in the main pipe, the exhaust mechanism reduces the flue gas velocity in the exhaust pipe, lowers the roller's rotation speed, and decreases the amount of dust entering the main pipe, preventing further dust accumulation. Attached Figure Description

[0029] The present application will be further described below with reference to the accompanying drawings and embodiments.

[0030] Figure 1 This is a structural diagram of this application.

[0031] Figure 2 This is a schematic diagram of the main structure of this application.

[0032] Figure 3 This is a side view of the main body of this application.

[0033] Figure 4 This is a schematic diagram of the dust removal mechanism structure of this application.

[0034] Figure 5 This is a partial sectional view of the dust removal mechanism in this application.

[0035] Figure 6 This is a schematic diagram of a partial component structure of the dust removal mechanism of this application.

[0036] Figure 7 This is a schematic diagram of the exhaust mechanism structure of this application.

[0037] Figure 8 This is a cross-sectional view of the exhaust mechanism of this application.

[0038] Figure 9 This is a schematic diagram of the feeding mechanism structure of this application.

[0039] Figure 10 This is a cross-sectional view of the feeding mechanism in this application.

[0040] Figure 11 This is a partial disassembly diagram of the feeding mechanism of this application.

[0041] In the diagram: 1. Slag remover; 2. Dust removal mechanism; 201. Housing; 202. Level gauge 1; 203. Circular roller; 204. Feed trough; 205. Rotating rod; 206. Motor; 207. Three-way ash chute; 208. Guide plate; 209. Fixed plate; 210. Cyclone separator; 211. Exhaust straight pipe; 212. Guide; 213. Partition plate; 214. Input pipe; 215. Spiral groove; 216. Support; 3. Exhaust mechanism; 301. Exhaust pipe; 302. Impeller; 303. Rectangular shell; 304. Conical teeth; 305. Transmission rod; 306. Conveyor... 307. Feeding pipe; 308. Secondary pipe; 309. Baffle; 310. Connecting rod; 311. Annular plate; 312. Spring; 313. Synchronous pulley; 4. Synchronous belt; 4. Feeding mechanism; 401. Main pipe; 402. Annular seat; 403. Vertical cylinder; 404. Piston; 405. Connecting pipe; 406. Round hole; 407. Movable rod; 408. Circular plate; 409. Level gauge II; 410. Connecting ring I; 411. Connecting frame; 412. Connecting ring II; 413. Electric cylinder; 414. U-shaped frame; 415. L-shaped plate; 416. Slider; 5. Vertical frame. Detailed Implementation

[0042] The following combination Figure 1 - Figure 11 The embodiments of this application will be described in detail.

[0043] This application discloses a water-cooled vibrating grate boiler tail flue gas purification device. By feeding dust into the boiler slag remover, the dust is wetted by water or mixed into slurry, suppressing dust emission. At the same time, wet treatment reduces the risk of spontaneous combustion or explosion. Even if dust accumulates at the lower port of the main pipe and is difficult to enter the water, the water injection component in the feeding mechanism can inject water into the sides and top of the dust accumulation in the main pipe to wet the dust, thereby allowing the accumulated dust to quickly enter the water and ensuring the dust discharge rate.

[0044] Example 1:

[0045] like Figures 1 to 4 As shown, the device includes a dust removal mechanism 2 and an exhaust mechanism 3. The dust removal mechanism 2 includes a box 201 with two cone-shaped funnels on the lower side. A bracket 216 is installed on the side of the box 201. A partition 213 and a fixing plate 209 are installed on the inner wall of the box 201 in sequence. An input pipe 214 is installed on the side of the box 201 between the partition 213 and the fixing plate 209. The device is supported on the ground by the bracket 216. The flue gas from the tail of the water-cooled vibrating grate boiler is sent into the box 201 through the input pipe 214 so that it is placed between the partition 213 and the fixing plate 209.

[0046] like Figure 4 and Figure 6As shown, multiple evenly distributed cyclones 210 are installed on the fixed plate 209. A guide 212 is provided at the upper port of the cyclone 210. The blades inside the guide 212 are evenly distributed in a circle and installed at an inclined angle. An exhaust pipe 211 is provided inside the cyclone 210, which passes through the guide 212 and extends to the top of the partition plate 213. The exhaust mechanism 3 includes an exhaust pipe 301 installed at the center of the upper side of the box 201. The flue gas is guided by the inclined blades of the guide 212 and enters the cyclone 210, spiraling downwards. The dust in the flue gas is thrown onto the inner wall of the cyclone 210 due to centrifugal force, and then falls freely and flows out from the lower port of the cyclone 210. Then the flue gas is sent to the top of the partition plate 213 through the guide 212 and discharged from the exhaust pipe 301.

[0047] like Figure 4 and Figure 5 As shown, a circular roller 203 is rotatably installed at the funnel port of the box 201. Multiple evenly distributed material troughs 204 are opened on the side of the circular roller 203. A three-way ash chute 207 is installed at the two lower ports of the box 201. A set of guide plates 208 is installed above each circular roller 203 inside the box 201. The dust discharged from the cyclone 210 falls into the funnel-shaped lower end of the box 201 and accumulates. The dust falls into the uppermost material trough 204. The guide plates 208 guide the dust so that it accurately enters the material trough 204. Then the rotating circular roller 203 drives the material trough 204 to rotate downwards, and then the dust inside falls freely.

[0048] like Figure 7 and Figure 8 As shown, an impeller 302 is rotatably installed inside the exhaust pipe 301. A conveying pipe 306 is bolted to the upper end of the exhaust pipe 301. A rectangular shell 303 is installed above the impeller 302. A drive rod 305 with an end extending to the outside of the exhaust pipe 301 is rotatably installed on the side of the rectangular shell 303. The shaft ends of the impeller 302 and the drive rod 305 both extend into the rectangular shell 303 and are equipped with meshing bevel teeth 304. The flue gas entering the exhaust pipe 301 drives the impeller 302 to rotate. The rotating impeller 302 drives the drive rod 305 to rotate through the two bevel teeth 304. At the same time, the flue gas enters the conveying pipe 306 through the exhaust pipe 301 and is guided by it to enter the next processing flow.

[0049] It should be noted that the delivery pipe 306 is bolted to the exhaust pipe 301, and the two can be disconnected to clean the impeller 302.

[0050] like Figure 4 and Figure 7As shown, a rotating rod 205 is mounted on both of the two circular rollers 203. A synchronous pulley 312 is provided at the end of both the transmission rod 305 and the rotating rod 205. The transmission rod 305 is made of iron. An electromagnet is provided between the end of the transmission rod 305 and the synchronous pulley 312. The electromagnet is rotatably connected to the end of the transmission rod 305. A synchronous belt 313 is provided on both synchronous pulleys 312. When the electromagnet is energized, the upper synchronous pulley 312 is magnetically connected to the transmission rod 305. The rotating transmission rod 305 drives the rotating rod 205 to rotate through the synchronous pulley 312 and the synchronous belt 313, thereby driving the two circular rollers 203 to rotate.

[0051] It should be noted that the transmission ratio between the upper synchronous belt 313 and the lower synchronous belt 313 is 1:1, which ensures that the rotational speed of the roller 203 meets the ash discharge requirements. At the same time, belt drives are low in cost, more suitable for long-distance transmission at the bottom and top of the box 201, have low noise, and are easy to maintain.

[0052] like Figure 4 As shown, a level gauge 202 is installed above each roller 203 inside the housing 201. A controller electrically connected to the level gauge 202 is also installed on the side of the housing 201. When the dust accumulates to the height of the level gauge 202, the level gauge 202 sends a signal to the controller. The controller controls the electromagnet to be energized so that the transmission rod 305 is connected to the upper synchronous wheel 312. Then the rotating blade wheel 302 can drive the rotating rod 205 to rotate. Dust is also discharged during the dust accumulation process. Since there is dust accumulation at the lower port, the flue gas will not be discharged from the lower port.

[0053] like Figure 4 As shown, a motor 206 is installed on the side of the housing 201 near the bottom, with its drive end connected to one end of the rotating rod 205. When dust remains inside the housing 201 after the flue gas treatment is completed, the motor 206 can also drive the rotating rod 205 to rotate and discharge all the dust.

[0054] like Figure 1 and Figure 9 As shown, the lower end of the three-way ash chute 207 is vertically downward and also includes a feeding mechanism 4. The feeding mechanism 4 includes a transparent main pipe 401 fitted onto the lower end of the three-way ash chute 207. A slag remover 1 is installed below the main pipe 401. The water level inside the slag remover 1 is adjusted in advance so that it contacts the lower end of the main pipe 401. The dust falling from the lower trough 204 is guided by the three-way ash chute 207 into the main pipe 401, and then enters the water of the slag remover 1 through the main pipe 401 to avoid dust scattering. The dust is cooled and allowed to settle to the bottom. At the same time, it can extinguish dust with sparks. Then, the moving scraper inside the slag remover 1 scrapes the dust from the bottom of the slag remover 1 to achieve dust treatment. The transparent main pipe 401 also makes it convenient for staff to observe the dust dispersion inside.

[0055] In summary, the flue gas from the tail end of the water-cooled vibrating grate boiler is fed into the housing 201 through the inlet pipe 214. The flue gas is guided by the guide 212 and then spirals downwards into the cyclone separator 210. Dust in the flue gas is thrown onto the inner wall of the cyclone separator 210 due to centrifugal force, and then falls freely out from the lower port of the cyclone separator 210. The dust-removed flue gas is then fed above the baffle plate 213 through the guide 212 and discharged from the exhaust pipe 301. The dust discharged from the cyclone separator 210 falls into the funnel-shaped lower end of the housing 201 and accumulates. When the dust accumulates to the height of the level gauge 202, the level gauge 202... A signal is sent to the controller, which energizes the electromagnet to connect the transmission rod 305 to the upper synchronous wheel 312. The rotating blade wheel 302 then drives the rotating rod 205 to rotate, and the dust falls into the uppermost trough 204. Then, the rotating roller 203 drives the trough 204 to rotate downwards, and the dust inside falls freely through the three-way ash chute 207 into the main pipe 401. After that, it enters the water of the slag remover 1 through the main pipe 401, where the dust is cooled and sinks to the bottom. Then, the moving scraper inside the slag remover 1 scrapes the dust from the bottom of the slag remover 1, thus achieving dust treatment.

[0056] like Figure 9 and Figure 10 As shown, the feeding mechanism 4 also includes an annular seat 402 installed on the side of the main pipe 401. A connecting ring 410 connected to the lower end of the U-shaped frame 414 is rotatably installed on the side of the annular seat 402. An electric cylinder 413 is installed on the side of the housing 201. The lower end of the electric cylinder 413 is provided with a U-shaped frame 414 connected to the main pipe 401. The telescopic electric cylinder 413 drives the main pipe 401 to rise and fall through the U-shaped frame 414, the connecting ring 410 and the annular seat 402.

[0057] like Figure 9 and Figure 10 As shown, multiple evenly distributed vertical cylinders 403 are installed on the lower side of the annular seat 402. A circular hole 406 is opened at the center of the lower end of the vertical cylinder 403. Two movable rods 407 are symmetrically installed at the port of the circular hole 406 inside the vertical cylinder 403. A circular plate 408 is slidably mounted on the movable rod 407. A limiting block is provided at the upper end of the movable rod 407 to limit the circular plate 408. When the vertical cylinder 403 descends into the water of the slag remover 1, the water pressure causes the circular plate 408 to rise on the movable rod 407, opening the circular hole 406. Water from the slag remover 1 enters the vertical cylinder 403. Then, during the ascent of the vertical cylinder 403, the gravity of the water in the vertical cylinder 403 presses the circular plate 408 against the lower port of the circular hole 406, thus closing it. Therefore, the circular hole 406 opens when the vertical cylinder 403 descends and closes when it rises.

[0058] like Figure 9 and Figure 10As shown, a connecting pipe 405, whose upper end is connected to the main pipe 401, is installed on the side of the vertical cylinder 403 near the lower end. A piston 404 is slidably installed inside the vertical cylinder 403. A connecting frame 411 extending to the outside of the vertical cylinder 403 is installed on the upper side of the piston 404. A connecting ring 412, which is sleeved on the side of the three-way ash chute 207 and rotatably connected to it, is installed on the upper end of the connecting frame 411. Since the piston 404 is stationary, during the rising process of the vertical cylinder 403, the piston 404 is used to press the water in the vertical cylinder 403 into the connecting pipe 405, and the water is sprayed out from the upper port of the connecting pipe 405. During the rising process of the main pipe 401, water is injected into the main pipe 401.

[0059] like Figure 10 As shown, a level gauge 409 is installed on the inner wall of the main pipe 401 away from the port. The level gauge 409 is electrically connected to the controller. When dust accumulates at the lower port of the main pipe 401 to the same height as the level gauge 409, the level gauge 409 is also electrically connected to the controller. The level gauge 409 sends a signal to the controller, which controls the electric cylinder 413 to continuously extend and retract. When the operator observes that there is no dust accumulation inside the main pipe 401, the electric cylinder 413 can be retracted to its shortest length by controlling the controller.

[0060] It should be noted that both level gauge 1 202 and level gauge 2 409 in this application are ultrasonic level gauges.

[0061] In summary, when the dust accumulates at the lower port of the main pipe 401 to the same height as the level gauge 409, the level gauge 409 sends a signal to the controller. The controller controls the electric cylinder 413 to continuously extend and retract, driving the main pipe 401 and all vertical cylinders 403 to continuously rise and fall. At the same time, when the vertical cylinder 403 descends, the round hole 406 opens to allow water to enter the vertical cylinder 403, and closes when it rises. The piston 404 uses to press the water in the vertical cylinder 403 into the connecting pipe 405, which then injects water into the main pipe 401 from its upper port. As the upper port of the connecting pipe 405 continuously rises, water is injected into the side of the dust accumulated in the main pipe 401 through the continuously rising port of the connecting pipe 405. When the connecting pipe 405 moves above the dust, water will be injected above the dust. The accumulated dust is easily dispersed by being wetted by water, allowing the accumulated dust to quickly enter the water in the slag remover 1. When the operator observes that there is no dust accumulation in the main pipe 401, the controller controls the electric cylinder 413 to retract to its shortest position.

[0062] like Figure 7 and Figure 8 As shown, multiple evenly distributed secondary pipes 307 with their lower ends connected to the housing 201 are installed on the side of the exhaust pipe 301 above the rectangular shell 303. The lower end of each secondary pipe 307 is provided with a baffle 308 that is adapted to it. When the baffle 308 rises to be in close contact with the lower end of the secondary pipe 307, it is closed. When the baffle 308 falls, it can be opened, allowing the flue gas to be discharged from the secondary pipe 307 into the exhaust pipe 301, thereby reducing the flue gas velocity in the exhaust pipe 301.

[0063] like Figure 7 and Figure 8 As shown, a connecting rod 309 extending to the outside of the housing 201 is installed on the upper side of the baffle 308. A ring plate 310 is installed on the upper end of all the connecting rods 309. Multiple evenly distributed springs 311 are connected between the ring plate 310 and the housing 201. The rising ring plate 310 drives the baffle 308 to rise through the connecting rods 309, while stretching the springs 311. When the springs 311 rebound and return to their original position, they also drive the ring plate 310 to return to its original position.

[0064] like Figure 3 As shown, a vertical frame 5 is slidably mounted on the side of the housing 201, with its upper end connected to the annular plate 310. An L-shaped plate 415 is installed on the side of the U-shaped frame 414 below the vertical frame 5. When the U-shaped frame 414 is retracted to its shortest length, the vertical frame 5 is lifted by the L-shaped plate 415. The vertical frame 5 drives the annular plate 310 to rise, causing the baffle 308 to block the secondary pipe 307. When the electric cylinder 413 extends to lower the main pipe 401, the support for the vertical frame 5 is released, thereby allowing the annular plate 310 to descend.

[0065] Meanwhile, during the continuous lifting and lowering of the electric cylinder 413 telescopic main pipe 401, its telescopic stroke is much smaller than its total stroke, and it will not encounter the vertical frame 5 during the telescopic process.

[0066] In summary, when the electric cylinder 413 extends, it causes the L-shaped plate 415 to descend, releasing the support of the vertical frame 5. The spring 311 rebounds, causing the annular plate 310 to descend, thus releasing the baffle 308 from closing the lower end of the secondary pipe 307. Subsequently, as the electric cylinder 413 continues to extend and retract, water is injected into the main pipe 401 to accelerate the entry of dust into the water. During this process, the flue gas in the housing 201 enters the exhaust pipe 301 through the secondary pipe 307, reducing the flue gas velocity in the exhaust pipe 301, reducing the speed of the impeller 302, and consequently reducing the speed of the roller 203, thus reducing the amount of dust entering the main pipe 401. When the electric cylinder 413 retracts to its shortest length, the vertical frame 5 lifts the annular plate 310, causing the baffle 308 to re-close the secondary pipe 307, and the flue gas is discharged normally from the exhaust pipe 301, while the speed of the impeller 302 increases.

[0067] It should be noted that the feeding mechanism 4 drives the main pipe 401 to move up and down through its internal electric cylinder 413 while simultaneously injecting water into it. The up-and-down movement of the main pipe 401 can achieve relative displacement with the dust accumulated inside, breaking the electrostatic engagement between the dust and the inner wall of the main pipe 401, and accelerating the dust falling. At the same time, during the water injection process, it can also cooperate with the exhaust mechanism 3 to provide a power source for opening the secondary pipe 307, realizing "one machine for multiple uses".

[0068] Example 2:

[0069] Based on Example 1, such as Figure 11As shown, the three-way ash chute 207 has a spiral groove 215 on its side inside the main pipe 401. A slider 416 connected to the inner wall of the main pipe 401 is slidably disposed in the spiral groove 215. During the process of the electric cylinder 413 extending and retracting to drive the main pipe 401 to rise and fall, the main pipe 401 is in a spiral rising and falling state through the cooperation of the spiral groove 215 and the slider 416. Consequently, the upper port of the connecting pipe 405 is also in a spiral rising and falling state. When the vertical cylinder 403 rises, when water is injected into the main pipe 401 through the upper port of the connecting pipe 405, more dust can come into contact with water, further improving the dust dispersion speed.

[0070] This application also discloses a method for purifying flue gas at the tail end of a water-cooled vibrating grate boiler, the steps of which are as follows:

[0071] S1. Flue gas dust removal: The dust removal mechanism 2 is used to remove dust from the tail flue gas of the water-cooled vibrating grate boiler. Specifically, the tail flue gas of the water-cooled vibrating grate boiler is sent into the housing 201 through the input pipe 214. The flue gas is guided by the guide 212 and enters the cyclone 210, spiraling downwards. The dust in the flue gas is thrown onto the inner wall of the cyclone 210 due to centrifugal force, and then falls freely and flows out from the lower port of the cyclone 210. Then, the flue gas with the dust removed is sent to the top of the baffle 213 through the guide 212 and discharged from the exhaust pipe 301. It then flows into the next processing flow through the conveying pipe 306.

[0072] S2. Dust treatment: Dust is fed into the slag remover 1 for treatment. Specifically, dust discharged from the cyclone separator 210 falls into the funnel-shaped lower end of the housing 201 and accumulates. When the dust accumulates to the height of the level gauge 202, the level gauge 202 sends a signal to the controller. The controller controls the electromagnet to be energized, so that the transmission rod 305 is connected to the upper synchronous wheel 312. Then, the rotating blade wheel 302 drives the rotating rod 205 to rotate, and the dust falls into the uppermost trough 204. Then, the rotating roller 203 drives the trough 204 to rotate downwards. After that, the dust falls freely and is guided through the three-way ash chute 207 into the main pipe 401. Then, it enters the water in the slag remover 1 through the main pipe 401, where the dust is cooled and sinks to the bottom. Then, the moving scraper inside the slag remover 1 scrapes the dust from the bottom of the slag remover 1, thus achieving dust treatment.

[0073] S3. Accumulation Processing: When dust accumulates in the main pipe 401, the feeding mechanism 4 accelerates its entry into the water of the slag remover 1. Specifically, when the dust accumulates at the lower end of the main pipe 401 to the same height as the level gauge 409, the level gauge 409 sends a signal to the controller. The controller controls the electric cylinder 413 to continuously extend and retract, driving the main pipe 401 and all vertical cylinders 403 to continuously rise and fall. At the same time, when the vertical cylinder 403 descends, the round hole 406 opens to allow water to enter the vertical cylinder 403, and closes when it rises. The piston 404 is used to control the water pressure inside the vertical cylinder 403. Water is injected into the main pipe 401 through the upper port of the connecting pipe 405. As the upper port of the connecting pipe 405 rises continuously, water is injected into the side of the dust accumulated in the main pipe 401 through the rising port of the connecting pipe 405. When the connecting pipe 405 moves above the dust, water will be injected on the dust. The accumulated dust is easily dispersed by being wetted by water, allowing the accumulated dust to quickly enter the water in the slag remover 1. When the staff observes that there is no dust accumulation in the main pipe 401, the electric cylinder 413 can be shortened to its shortest length by controlling the controller.

[0074] S4. Speed ​​adjustment: During the dust removal process in the main pipe 401, the rotation speed of the rotating rod 205 is reduced. Specifically, when the electric cylinder 413 extends, it drives the L-shaped plate 415 to descend and release the support of the vertical frame 5. The spring 311 rebounds, causing the annular plate 310 to descend, thus releasing the baffle 308 from closing the lower end of the secondary pipe 307. Subsequently, as the electric cylinder 413 continues to extend and retract, water is injected into the main pipe 401 to accelerate the entry of dust into the water. During this process, the flue gas in the housing 201 enters the exhaust pipe 301 through the secondary pipe 307, reducing the flue gas flow rate in the exhaust pipe 301, reducing the speed of the impeller 302, and thus reducing the speed of the roller 203, reducing the amount of dust entering the main pipe 401. When the electric cylinder 413 is retracted to its shortest length, the vertical frame 5 lifts the annular plate 310, allowing the baffle 308 to close the secondary pipe 307 again. The flue gas is then discharged normally from the exhaust pipe 301, and the speed of the impeller 302 increases.

[0075] It will be apparent to those skilled in the art that this application is not limited to the details of the exemplary embodiments described above, and that this application can be implemented in other specific forms without departing from the spirit or essential characteristics of this application. Therefore, the embodiments should be considered in all respects as exemplary and not restrictive.

[0076] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A water-cooled vibrating grate boiler tail flue gas purification treatment device, characterized in that: it comprises a dust removal mechanism and an exhaust mechanism, the dust removal mechanism comprises a box body with two conical funnel shapes on the lower side, a round roller is rotatably installed at the funnel port of the box body, a plurality of uniformly distributed troughs are formed in the side surface of the round roller, a three-way ash chute is jointly installed at the two lower ports of the box body, a slag conveyor is arranged below the three-way ash chute; the exhaust mechanism comprises an exhaust pipe installed on the upper center of the box body, a vane wheel is rotatably arranged in the exhaust pipe, the exhaust mechanism further comprises a transmission assembly, and the transmission assembly is used for rotating all the round rollers driven by the vane wheel; the device further comprises a feeding mechanism, the feeding mechanism comprises a main pipe sleeved on the lower port of the three-way ash chute, an electric cylinder is installed on the side surface of the box body, and a U-shaped frame connected with the main pipe is arranged at the lower end of the electric cylinder; the feeding mechanism further comprises a water injection assembly, and the water injection assembly injects water into the main pipe during the extension and retraction of the electric cylinder; the water injection mechanism comprises an annular seat installed on the side surface of the main pipe, a connecting ring I connected with the lower end of the U-shaped frame is rotatably installed on the side surface of the annular seat, a plurality of uniformly distributed vertical cylinders are installed on the lower side of the annular seat, a connecting pipe in communication with the main pipe is installed on the side surface of the vertical cylinder close to the lower end; a circular hole is formed in the center of the lower end of the vertical cylinder, two movable rods in the vertical cylinder are symmetrically installed at the port of the circular hole, a circular plate is slidably arranged on the movable rod, a piston is slidably arranged in the vertical cylinder, a connecting frame extending to the outside of the vertical cylinder is installed on the upper side of the piston, and a connecting ring II sleeved on the side surface of the three-way ash chute and rotatably connected with the three-way ash chute is jointly installed on the upper end of the connecting frame; a plurality of uniformly distributed auxiliary pipes in communication with the box body are installed above the rectangular shell on the side surface of the exhaust pipe, a baffle matched with the auxiliary pipe is arranged at the lower port of the auxiliary pipe, and the auxiliary pipe is closed when the baffle rises to be in close contact with the lower port of the auxiliary pipe; a connecting rod extending to the outside of the box body is installed on the upper side of the baffle, an annular plate is jointly installed on the upper ends of all the connecting rods, and a plurality of uniformly distributed springs are connected between the annular plate and the box body; a vertical frame connected with the annular plate at the upper end is slidably arranged on the side surface of the box body, an L-shaped plate is installed below the vertical frame on the side surface of the U-shaped frame, and the extension and retraction of the electric cylinder drives the annular plate to rise and fall through the L-shaped plate and the vertical frame. A rotating rod is jointly installed on the two round rollers, an electric motor connected with one end of the rotating rod is installed on the side surface of the box body close to the bottom, and a group of guide plates is installed above each round roller in the box body. A plurality of uniformly distributed cyclones are installed on the fixed plate, a guide is arranged at the upper port of the cyclone, and an exhaust straight pipe extending above the baffle is arranged in the cyclone. The transmission assembly comprises a rectangular shell arranged above the vane wheel, a transmission rod with an end extending to the outside of the exhaust pipe and connected with the rotating rod in belt form is rotatably installed on the side surface of the rectangular shell, and the rotating shaft ends of the vane wheel and the transmission rod extend into the rectangular shell and are provided with intermeshing bevel gears. The device comprises the following steps: S1, flue gas dust removal, the dust removal mechanism is used for dust removal of the water-cooled vibrating grate boiler tail flue gas; S2, dust treatment, the dust is sent into the slag conveyor for treatment; S3, accumulation treatment, when the dust accumulates in the main pipe, the feeding mechanism is used to accelerate the dust into the water in the slag conveyor. ​ ​ 2. A device for cleaning the flue gases in the back pass of a water-cooled vibrating grate boiler according to claim 1, characterised in that ​ 3. A device for cleaning the flue gases in the back pass of a water- cooled vibrating grate boiler according to claim 2, characterised in that ​ 4. A device for cleaning the flue gases in the back pass of a water- cooled vibrating grate boiler according to claim 3, characterised in that ​ 5. A flue gas cleaning method using the water-cooled vibrating grate boiler tail flue gas cleaning apparatus according to any one of claims 1 to 4, characterized by, ​ ​ ​ ​ S4, speed regulation, reducing the rotation speed of the rotating rod during the process of treating the dust accumulated in the main pipe.

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