Gas recovery and emission reduction device of biomass-fired boiler

Abstract

The invention relates to the technical field of gas recovery and emission reduction, and discloses a biomass-fired boiler gas recovery and emission reduction device which comprises a coal economizer, a butt joint pipe is fixedly connected to the top of the coal economizer, a mounting ring is fixedly connected into the butt joint pipe, and a plurality of annularly and evenly distributed guide plates are fixedly connected into the mounting ring. The inner wall of the butt joint pipe is fixedly connected with a fixed annular plate, the fixed annular plate is located below the flow guide plate, the inner wall of the fixed annular plate is fixedly connected with a plurality of evenly-distributed mounting frames, a plurality of evenly-distributed blocking rods are fixedly connected into the mounting frames, and a plurality of shallow grooves are formed in the surfaces of the blocking rods. The problem that when large-size particles move at a high speed, impact force on the inner wall of the economizer is large, and consequently abrasion to the inner wall of the economizer is large can be optimized, the service life of the economizer is prolonged to a certain degree, and due to the fact that the service life of the economizer is longer, the gas recovery and emission reduction efficiency of the economizer can be improved to a certain degree.

Description

Technical Field

[0001] This invention relates to the field of gas recovery and emission reduction technology, specifically to a gas recovery and emission reduction device for biomass boilers. Background Technology

[0002] A biomass boiler is a type of boiler equipment that uses organic materials such as biomass pellets, wood blocks, sawdust, straw, and rice husks as fuel. Its main function is to heat water into hot water or steam for purposes such as heating, industrial production, or power generation. When using biomass boilers, a large amount of waste gas is generated during the combustion of biomass materials. In order to improve environmental protection, a special device for waste gas recovery and emission reduction is usually added at the waste gas emission point of biomass boilers. In actual use, this device is usually an economizer. The main function of the economizer is to recover sensible heat from the flue gas. Essentially, it is a heat exchanger with the boiler's inlet pipe inside and high-temperature flue gas outside. When the flue gas flows through the economizer, it transfers heat to the boiler's feed water, thus preheating the feed water. At this time, the boiler body does not need to consume additional fuel to heat the cold water, which significantly improves the boiler's thermal efficiency and saves fuel. With less fuel consumption, the amount of exhaust gas emitted will also decrease, thereby achieving the purpose of recovery and emission reduction. Furthermore, by reducing the amount of exhaust gas emitted, the pollution of the atmosphere is reduced. Due to the unique working principle of economizers, they require high-temperature exhaust gas. The exhaust gas is at its highest temperature immediately upon exiting the boiler. To maximize the utilization of the sensible heat in the exhaust gas, it is typically the first exhaust gas to enter the economizer. However, since the exhaust gas is untreated at this point, larger particles in the exhaust gas impact the inner wall of the economizer shell during its high-speed flow. This impact force is significant, and the larger particles are more adhesive, increasing the probability of them adhering to the inner wall of the economizer and causing blockages in the exhaust gas passages, thus affecting the economizer's service life. Therefore, we propose a biomass boiler gas recovery and emission reduction device. Summary of the Invention

[0003] The purpose of this invention is to provide a biomass boiler gas recovery and emission reduction device to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a biomass boiler gas recovery and emission reduction device, comprising an economizer, a connecting pipe fixedly connected to the top of the economizer, an installation ring fixedly connected inside the connecting pipe, a plurality of annularly evenly distributed guide plates fixedly connected inside the installation ring, a fixing ring plate fixedly connected to the inner wall of the connecting pipe, the fixing ring plate being located below the guide plates, a plurality of evenly distributed mounting frames fixedly connected to the inner wall of the fixing ring plate, a plurality of evenly distributed blocking bars fixedly connected inside the mounting frames, and a plurality of shallow grooves provided on the surface of each blocking bar; The bottom of the mounting frame is rotatably connected to a number of rotating wheels A equal to the number of barrier bars. Several limiting plates A are fixedly connected to the rotating wheels A, and the bottom of each barrier bar is fixedly connected to the rotating wheel A at the corresponding position.

[0005] Preferably, the mounting frame has a sliding groove, a rack is fixedly connected in the sliding groove, a dust collection box is fixedly connected to one side of the bottom of the mounting frame, and an extension plate is fixedly connected to the top of the dust collection box on the side away from the mounting frame.

[0006] Preferably, a mounting cover is slidably connected within the groove, and a communication opening is provided on the side of the mounting cover near the rack. A gear is rotatably connected within the mounting cover, and the gear meshes with the rack through the communication opening.

[0007] Preferably, a mounting rod is fixedly connected to the side of the mounting cover near the barrier bar, and a scraper is fixedly connected to the side of the mounting rod near the barrier bar. The inner wall of the scraper is provided with protrusions that can engage with the shallow grooves on the surface of the barrier bar.

[0008] Preferably, a rotating wheel B is rotatably connected to the side of the mounting cover away from the mounting rod, and a plurality of evenly distributed limiting plates B are fixedly connected to the rotating wheel B. The rotating wheel B is fixedly connected to the shaft of the gear.

[0009] Preferably, a flow guide is slidably connected to the side of the mounting frame near the rotating wheel B, the rotating wheel B and the limiting plate B are both located inside the flow guide, an air inlet is provided on the top side of the flow guide, and an air outlet is provided on the side of the flow guide away from the air inlet.

[0010] Preferably, the side of the air guide shroud near the air inlet is fixedly connected to an installation tube, the installation tube has an air guide hole that communicates with the air inlet, and the inner wall of the air guide hole is provided with a contraction opening.

[0011] Preferably, a mounting box is fixedly connected to the top of the mounting cover, and a constant force spring is fixedly connected inside the mounting box. The end of the constant force spring away from the mounting box is fixedly connected to the inner top wall of the slide groove.

[0012] Preferably, a fixing frame is fixedly connected to the side of the mounting tube away from the mounting frame, and a fan is rotatably connected inside the fixing frame. The fan consists of a shaft and several fan blades, and a sealing plate is fixedly connected to one end of the fan shaft through a bracket. The sealing plate is attached to the guide hole of the mounting tube.

[0013] Preferably, the bottom of the mounting frame is fixedly connected with the same number of wind-blocking arc plates as the rotating wheel A, and the wind-blocking arc plates are all located on one side of the rotating wheel A at their corresponding positions, and the bottom of the wind-blocking arc plates is fixedly connected with a base plate.

[0014] Compared with the prior art, the beneficial effects of the present invention are: This invention utilizes a combination of guide plates and baffle bars. The guide plates direct the waste gas entering the connecting pipe, causing it to flow in a spiral pattern. During this process, particulate matter in the waste gas generates centrifugal force, with larger particles experiencing greater centrifugal force. These larger particles are thrown closer to the inner wall of the fixed ring plate and move spirally with the waste gas until they reach the baffle bars. The baffle bars, with their shallow grooves, effectively block larger particles, while smaller particles, due to their weaker adhesion and smaller size, are blown by the flowing waste gas and pass between the baffle bars. This process separates large and small particles, addressing the issue of excessive impact on the economizer's inner wall caused by large particles moving at high speeds, leading to greater wear. This improves the economizer's lifespan and, consequently, increases its gas recovery and emission reduction efficiency. This invention utilizes the thrust generated by the flow of exhaust gas, combined with an installation pipe equipped with a constriction opening, to increase the speed of the exhaust gas flow and the impact force generated during its flow. This allows the limiting plate B and the rotating wheel B to rotate, thereby driving the gear to rotate. The gear and rack work together to cause the installation cover to lower the installation rod and scraper. The scraper peels off larger particles attached to the barrier rod. Simultaneously, with the cooperation of a constant force spring, a fan, and a sealing plate, the scraper can move up and down, allowing it to continuously clean the barrier rod and improving its auxiliary function in blocking larger particles. This invention utilizes the flow of exhaust gas to drive the rotation of limiting plate A and rotating wheel A. Since part of the limiting plate A41 is located within the windbreak arc plate, the exhaust gas can only blow on the limiting plate A41 outside the windbreak arc plate. Combined with its spiral flow direction, this drives the rotating wheel A to rotate, which in turn drives the barrier bar to rotate, causing the windward side of the barrier bar to turn to the scraper side, while the clean side of the barrier bar rotates to the windward side. At this time, while the scraper cleans one side of the barrier bar, the clean side of the barrier bar can continue to block larger particles, effectively improving the service life of the barrier bar and enhancing its auxiliary function in blocking larger particles during the cleaning process. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the pipe assembly structure of the present invention; Figure 3 This is a schematic diagram of the mounting frame structure of the present invention; Figure 4 This is a schematic diagram of the bottom structure of the mounting frame of the present invention; Figure 5 This is a schematic diagram of the air guide cover structure of the present invention; Figure 6 This is a schematic cross-sectional view of the flow guide and mounting tube of the present invention; Figure 7 This is a schematic diagram of the cross-sectional structure of the mounting cover of the present invention; Figure 8 This is a schematic diagram of the structure of the rotor A and its connecting components of the present invention; Figure 9 For the present invention Figure 4 The diagram shows an enlarged view of area A.

[0016] In the diagram: 1. Economizer; 11. Connecting pipe; 2. Mounting ring; 21. Guide plate; 3. Fixing ring plate; 31. Mounting frame; 32. Barrier bar; 33. Slide groove; 34. Rack; 35. Dust collection box; 4. Rotor A; 41. Limiting plate A; 42. Windproof arc plate; 43. Base plate; 5. Mounting cover; 51. Connecting port; 52. Gear; 53. Mounting rod; 54. Scraper; 6. Mounting box; 61. Constant force spring; 7. Rotor B; 71. Limiting plate B; 72. Guide cover; 73. Air inlet; 74. Air outlet; 8. Mounting pipe; 81. Guide hole; 82. Contraction port; 9. Fixing frame; 91. Fan; 92. Sealing plate. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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.

[0018] Please see Figure 1-9 The present invention provides a technical solution: a gas recovery and emission reduction device for biomass boilers, including an economizer 1, a connecting pipe 11 fixedly connected to the top of the economizer 1, an installation ring 2 fixedly connected inside the connecting pipe 11, and a plurality of annularly distributed guide plates 21 fixedly connected inside the installation ring 2.

[0019] Furthermore, the economizer 1 is the main structure of this energy recovery and emission reduction device. It contains several water pipes and is enclosed by an outer shell. In use, the economizer 1 is connected to the exhaust port of the biomass boiler using a connecting pipe 11. When the biomass boiler discharges waste gas, the waste gas passes through the connecting pipe 11 into the outer shell of the economizer 1. The high temperature of the waste gas preheats the cold water in the water pipes inside the economizer 1. After preheating, the cold water in the pipes enters the boiler and continues to be heated using the biomass fuel inside the boiler, thereby producing hot water or steam for heating, industrial production, or power generation. In this way, the sensible heat of the waste gas can be recovered. Furthermore, because the sensible heat of the waste gas is recovered and the cold water is preheated, the fuel required by the boiler body is reduced. This can reduce the amount of exhaust gas emitted by the boiler, thereby achieving the purpose of emission reduction and reducing the pollution of the atmosphere by exhaust gas. When the exhaust gas enters the connecting pipe 11, it will pass through the guide plate 21. The guide plate 21 is inclined in the same direction. When the exhaust gas passes through the guide plate 21, it will form a spiral flow with the inclination direction of the guide plate 21, which increases the flow distance of the exhaust gas. This allows the exhaust gas to stay in the economizer 1 for a longer time than under normal conditions, resulting in a higher recovery and utilization rate of the sensible heat of the exhaust gas. At the same time, when the exhaust gas flows in a spiral shape, the particulate matter mixed in the exhaust gas will be affected by centrifugal force and thus be thrown towards the inner wall of the connecting pipe 11. The larger the particulate matter, the greater the centrifugal force it experiences, which will form a more obvious partition with the relatively smaller particulate matter.

[0020] Combined with appendix Figure 2 , Figure 3 , Figure 4 and Figure 9 As shown, a fixing ring plate 3 is fixedly connected to the inner wall of the connecting pipe 11. The fixing ring plate 3 is located below the guide plate 21. Several evenly distributed mounting frames 31 are fixedly connected to the inner wall of the fixing ring plate 3. Several evenly distributed blocking bars 32 are fixedly connected inside the mounting frames 31. Several shallow grooves are provided on the surface of the blocking bars 32.

[0021] Furthermore, when the exhaust gas and the particulate matter it contains flow in a spiral shape, they will pass through the barrier bars 32 in each mounting frame 31 in sequence. At this time, the barrier bars 32 rely on the shallow grooves on their surfaces to increase the friction with the exhaust gas particles and block the exhaust gas particles. Due to the adhesion of the exhaust gas particles, they are adsorbed onto the barrier bars 32. There is a certain gap between the barrier bars 32, so that larger particles can be successfully adsorbed onto the barrier bars 32. Smaller particles either do not move to the barrier bars 32 due to the smaller centrifugal force, or are directly carried by the flowing exhaust gas through the gaps between the barrier bars 32 due to their relatively low adhesion. This completes the separation of large and small particles. When large particles are blocked by the barrier bars 32, the impact force of the large particles on the inner wall of the economizer 1 shell is reduced, which leads to the problem of large wear on the inner wall of the economizer 1.

[0022] Combined with appendix Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 9 As shown, the mounting frame 31 has a groove 33, a rack 34 is fixedly connected in the groove 33, and a mounting cover 5 is slidably connected in the groove 33. A connecting port 51 is provided on the side of the mounting cover 5 near the rack 34. A gear 52 is rotatably connected inside the mounting cover 5, and the gear 52 meshes with the rack 34 through the connecting port 51. A mounting rod 53 is fixedly connected on the side of the mounting cover 5 near the barrier bar 32, and a scraper 54 is fixedly connected on the side of the mounting rod 53 near the barrier bar 32. The inner wall of the scraper 54 has protrusions that can engage with shallow grooves on the surface of the barrier bar 32. A dust collection box 35 is fixedly connected to one side of the bottom of the mounting frame 31. The dust collection box 35 is located on the back of the mounting frame 31 in the direction of inclination towards the guide plate 21. That is, when the exhaust gas passes through the guide plate 21 and flows in a spiral shape, it will first pass through the barrier bar 32. Then, the dust collection box 35 is contacted. An extension plate is fixedly connected to the top of the dust collection box 35 on the side away from the mounting frame 31. A rotating wheel B7 is rotatably connected to the side of the mounting cover 5 away from the mounting rod 53. Several evenly distributed limiting plates B71 are fixedly connected to the rotating wheel B7. The rotating wheel B7 is fixedly connected to the rotating shaft of the gear 52. A guide shroud 72 is slidably connected to the side of the mounting frame 31 near the rotating wheel B7. The rotating wheel B7 and the limiting plates B71 are both located inside the guide shroud 72. An air inlet 73 is opened on the top side of the guide shroud 72. An air outlet 74 is opened on the side of the guide shroud 72 away from the air inlet 73. An installation pipe 8 is fixedly connected to the side of the guide shroud 72 near the air inlet 73. A guide hole 81 communicating with the air inlet 73 is opened on the installation pipe 8. A contraction opening 82 is provided on the inner wall of the guide hole 81.

[0023] Furthermore, during the exhaust gas flow, some exhaust gas will enter the guide shroud 72 through the guide hole 81 of the mounting pipe 8. The mounting pipe 8 has a constriction port 82. When the exhaust gas enters the mounting pipe 8, the narrowing of the internal channel accelerates the exhaust gas flow and increases the impact force as the exhaust gas enters the guide shroud 72. The impact force generated when the exhaust gas flows onto the limiting plate B71 drives the rotating wheel B7 to rotate. The exhaust gas is then discharged through the exhaust port 74. During this rotation, the rotating wheel B7 drives the gear 52 to rotate as well. The gear 52, when rotating, engages with the rack 34 and descends along the rack 34. During the process, the mounting cover 5 will descend together, and the mounting cover 5 will descend together with the mounting rod 53 and the scraper 54. When the scraper 54 descends, it will scrape off the larger particles attached to the surface of the barrier rod 32 and its shallow groove through the protrusions on its inner wall, and make these particles descend along the barrier rod 32. When these particles are pushed to the inner bottom wall of the mounting frame 31, they are blown towards the dust collection box 35 by the thrust of the flowing exhaust gas. The top of the dust collection box 35 on the side away from the mounting frame 31 is provided with an extension plate, which can block these particles and allow them to enter the dust collection box 35 smoothly.

[0024] Combined with appendix Figure 4 and Figure 8 As shown, the bottom of the mounting frame 31 is rotatably connected to the same number of rotating wheels A4 as the number of barrier bars 32. Several limiting plates A41 are fixedly connected to the rotating wheels A4. The bottom of each barrier bar 32 is fixedly connected to the rotating wheel A4 at the corresponding position. The bottom of the mounting frame 31 is fixedly connected to the same number of wind-blocking arc plates 42 as the number of rotating wheels A4. Each wind-blocking arc plate 42 is located on one side of the rotating wheel A4 at the corresponding position. The bottom of each wind-blocking arc plate 42 is fixedly connected to a base plate 43.

[0025] Furthermore, since one side of the rotor A4 is blocked by the semi-circular windbreak plate 42, during the exhaust gas flow, the exhaust gas will only blow against the limiting plate A41 located outside the windbreak plate 42. And since the exhaust gas flows in a spiral shape after passing through the guide plate 21, the spirally flowing exhaust gas will cooperate with each limiting plate A41 to drive the rotor A4 to rotate. At this time, the rotor A4 will drive the blocking bar 32 to rotate. Because the spirally flowing exhaust gas will only contact the windward side of the blocking bar 32, and thus pass through... The rotating barrier bar 32 can work in conjunction with the movable scraper 54. As the barrier bar 32 rotates, its clean side becomes the windward side, while the side that has adsorbed particles rotates to the direction of the scraper 54, and the scraper 54 cleans its surface, thus improving the service life of the barrier bar 32. At the same time, a metal damping plate is provided between the rotating wheel A4 and the bottom of the mounting frame 31 to reduce the rotation speed of the rotating wheel A4 and prevent the barrier bar 32 from rotating too fast, which would cause the centrifugal force to directly throw the particles adsorbed on its surface away.

[0026] Combined with appendix Figure 5 , Figure 6 and Figure 7 As shown, a mounting box 6 is fixedly connected to the top of the mounting cover 5. A constant force spring 61 is fixedly connected inside the mounting box 6. The end of the constant force spring 61 away from the mounting box 6 is fixedly connected to the inner top wall of the slide groove 33. A fixing frame 9 is fixedly connected to the side of the mounting tube 8 away from the mounting frame 31. A fan 91 is rotatably connected inside the fixing frame 9. The fan 91 is composed of a shaft and several fan blades. A sealing plate 92 is fixedly connected to one end of the shaft of the fan 91 through a bracket. The sealing plate 92 is attached to the guide hole 81 of the mounting tube 8.

[0027] Furthermore, during the flow of exhaust gas, it can drive the fan 91 to rotate, and the rotating fan 91 drives the sealing plate 92 to rotate. At the same time, when the gear 52 rotates, causing the mounting cover 5 to descend, the mounting cover 5 will drive the mounting box 6 to descend together, and pull the constant force spring 61. Due to the characteristics of the constant force spring 61, the required force after stretching is the same. Therefore, the constant force spring 61 can be continuously stretched while the gear 52 is rotating at a constant speed. In actual use, when the sealing plate 92 moves away from the guide hole 81 of the mounting pipe 8, the exhaust gas can normally enter the guide cover 72 and drive the rotating wheel B7 to rotate, thereby causing the gear 52 and the mounting cover 5 to descend. At this time, the constant force spring 61 is stretched. When the sealing plate 92 moves to the guide hole 81, the exhaust gas can normally enter the guide cover 72 and drive the rotating wheel B7 to rotate, thereby causing the gear 52 and the mounting cover 5 to descend. At this time, the constant force spring 61 is stretched. When the guide hole 81 of the installation pipe 8 is reached, the impact force decreases due to blockage or insufficient exhaust gas flow into the guide hole 81. At this time, the constant force spring 61 will start to rebound, causing the mounting cover 5 and gear 52 to lift and reset, thus achieving the purpose of cyclic processing of the barrier bar 32. At the same time, a metal damping plate is also provided at the shaft of the fan 91 to prevent the fan 91 from rotating too fast, which would cause the sealing plate 92 to block the guide hole 81 of the installation pipe 8 too quickly, resulting in the constant force spring 61 being stretched again before it has completed its reset. In addition, since the sealing plate 92 is installed at the shaft of the fan 91 through the bracket, the shaft of the fan 91 is subjected to uneven force. By limiting the speed of the fan 91, the stability of the fan 91 can also be improved.

[0028] Working principle: When using this device, first connect the economizer 1 to the exhaust port of the biomass boiler using the connecting pipe 11. When the biomass boiler discharges waste gas, the waste gas will enter the outer shell of the economizer 1 through the connecting pipe 11 and use the high temperature of the waste gas to preheat the cold water in the water pipe inside the economizer 1. After the preheating is completed, the cold water in the water pipe will enter the boiler and continue to be heated using the biomass fuel in the boiler, thereby producing hot water or steam for heating, industrial production or power generation. As the exhaust gas enters the connecting pipe 11, it passes through the guide plates 21, which are all inclined in a uniform direction. As the exhaust gas passes through the guide plates 21, it forms a spiral flow, increasing the flow distance and allowing the exhaust gas to remain in the economizer 1 for a longer period compared to normal conditions. This results in a higher recovery rate of sensible heat from the exhaust gas. Simultaneously, when the exhaust gas flows in a spiral, the particulate matter mixed in it is affected by centrifugal force, causing it to be flung towards the inner wall of the connecting pipe 11. Larger particles experience greater centrifugal force, creating a more distinct separation between the exhaust gas and smaller particles. When the particulate matter contained in the gas flows in a spiral shape, it will pass through the barrier bars 32 in each mounting frame 31 in turn. At this time, the barrier bars 32 rely on the shallow grooves on their surfaces to increase the friction with the exhaust gas particles and block the exhaust gas particles. Due to the adhesion of the exhaust gas particles, they are adsorbed onto the barrier bars 32. There is a certain gap between the barrier bars 32, so that larger particles can be successfully adsorbed onto the barrier bars 32. Smaller particles either do not move to the barrier bars 32 due to the smaller centrifugal force, or are directly carried by the flowing exhaust gas through the gap between the barrier bars 32 due to their relatively low adhesion. This completes the separation of large and small particles. Simultaneously, during the flow of exhaust gas, it can drive the fan 91 to rotate, and the rotating fan 91 can drive the sealing plate 92 to rotate. When the sealing plate 92 moves away from the guide hole 81 of the mounting pipe 8, some exhaust gas will enter the guide shroud 72 through the guide hole 81 of the mounting pipe 8. The mounting pipe 8 is provided with a contraction port 82. When the exhaust gas enters the mounting pipe 8, the internal channel of the mounting pipe 8 narrows, which will accelerate the flow speed of the exhaust gas and increase the impact force of the exhaust gas entering the guide shroud 72. The impact force generated when the exhaust gas flows onto the limiting plate B71 will drive the rotating wheel B7 to rotate. Then the exhaust gas will be discharged through the exhaust port 74. At this time, during the rotation of the rotating wheel B7, it can drive the gear 52 to rotate together. When the gear 52 rotates, it can cooperate with the rack 34 and... As the rack 34 descends, the mounting cover 5 descends along with it. The mounting cover 5 then descends along with the mounting rod 53 and the scraper 54. Simultaneously, the mounting cover 5 descends along with the mounting box 6 and pulls the constant force spring 61. When the scraper 54 descends, it scrapes away larger particles adhering to the surface of the barrier rod 32 and its shallow groove through the protrusions on its inner wall. These particles then descend along with the barrier rod 32. When these particles are pushed onto the inner bottom wall of the mounting frame 31, they are blown towards the dust collection box 35 by the thrust of the flowing exhaust gas. The top of the dust collection box 35, away from the mounting frame 31, is provided with an extension plate. This extension plate can block these particles, allowing them to enter the dust collection box 35 smoothly. When the sealing plate 92 moves to the guide hole 81 of the mounting pipe 8, the impact force becomes smaller because the guide hole 81 is blocked or the amount of exhaust gas entering is small. At this time, the constant force spring 61 will start to rebound, driving the mounting cover 5 and gear 52 and other components to start to lift and perform the reset work, thereby achieving the purpose of cyclic processing of the barrier bar 32. Meanwhile, since one side of the rotating wheel A4 is blocked by the semi-circular windbreak plate 42, during the flow of exhaust gas, the exhaust gas will only blow against the limiting plate A41 located outside the windbreak plate 42. After passing through the guide plate 21, the exhaust gas will flow in a spiral shape. At this time, the exhaust gas flowing in a spiral shape will cooperate with each limiting plate A41 to drive the rotating wheel A4 to rotate. The rotating wheel A4 will drive the blocking rod 32 to rotate. Since the spiral exhaust gas will only contact the windward side of the blocking rod 32 when it flows, the rotatable blocking rod 32 can cooperate with the movable scraper 54. When the blocking rod 32 rotates, its clean side can become the windward side, while the side that has adsorbed particulate matter can rotate to the direction of the scraper 54 and use the scraper 54 to clean its surface, thereby improving the service life of the blocking rod 32.

[0029] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0030] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A gas recovery and emission reduction device for a biomass boiler, comprising an economizer (1), wherein a connecting pipe (11) is fixedly connected to the top of the economizer (1), an installation ring (2) is fixedly connected inside the connecting pipe (11), and a plurality of annularly distributed guide plates (21) are fixedly connected inside the installation ring (2), characterized in that: The inner wall of the butt joint pipe (11) is fixedly connected with a fixed ring plate (3), the fixed ring plate (3) is located below the guide plate (21), a plurality of uniformly distributed installation frames (31) are fixedly connected to the inner wall of the fixed ring plate (3), a plurality of uniformly distributed blocking rods (32) are fixedly connected in the installation frames (31), and a plurality of shallow grooves are formed in the surfaces of the blocking rods (32). A same number of rotating wheels A (4) are rotatably connected to the bottoms of the installation frames (31) and are fixedly connected with the blocking rods (32), a plurality of limiting plates A (41) are fixedly connected to the rotating wheels A (4), and the bottoms of the blocking rods (32) are fixedly connected with the corresponding rotating wheels A (4).

2. The biomass-fired boiler gas recovery and emission reduction device according to claim 1, characterized in that: A sliding groove (33) is formed in the installation frame (31), a gear rack (34) is fixedly connected in the sliding groove (33), a dust collecting box (35) is fixedly connected to one side of the bottom of the installation frame (31), and an extension plate is fixedly connected to the side, away from the installation frame (31), of the top of the dust collecting box (35).

3. The biomass-fired boiler gas recovery and emission reduction device according to claim 2, characterized in that: An installation cover (5) is slidably connected in the sliding groove (33), a communication opening (51) is formed in the side, close to the gear rack (34), of the installation cover (5), and a gear wheel (52) is rotatably connected in the installation cover (5) and is in engagement with the gear rack (34) through the communication opening (51).

4. The biomass-fired boiler gas recovery and emission reduction device according to claim 3, characterized in that: An installation rod (53) is fixedly connected to the side, close to the blocking rod (32), of the installation cover (5), a scraping piece (54) is fixedly connected to the side, close to the blocking rod (32), of the installation rod (53), and protrusions are arranged on the inner wall of the scraping piece (54) and can be engaged with the shallow grooves in the surface of the blocking rod (32).

5. A device for recovering and reducing emission of gas from a biomass-fired boiler according to claim 4, characterized in that: A rotating wheel B (7) is rotatably connected to the side, away from the installation rod (53), of the installation cover (5), a plurality of uniformly distributed limiting plates B (71) are fixedly connected to the rotating wheel B (7), and the rotating wheel B (7) is fixedly connected with the rotating shaft of the gear wheel (52).

6. A device for recovering and reducing emission of gas from a biomass-fired boiler according to claim 5, characterized in that: A guide cover (72) is slidably connected to the side, close to the rotating wheel B (7), of the installation frame (31), the rotating wheel B (7) and the limiting plates B (71) are located in the guide cover (72), an air inlet (73) is formed in one side of the top of the guide cover (72), and an air outlet (74) is formed in the side, away from the air inlet (73), of the guide cover (72).

7. A device for recovering and reducing emission of gas from a biomass-fired boiler according to claim 6, characterized in that: An installation pipe (8) is fixedly connected to the side, close to the air inlet (73), of the guide cover (72), a guide hole (81) is formed in the installation pipe (8) and is in communication with the air inlet (73), and a contraction opening (82) is arranged on the inner wall of the guide hole (81).

8. The biomass-fired boiler gas recovery emission reduction device according to claim 3, characterized in that: An installation box (6) is fixedly connected to the top of the installation cover (5), a constant force spring (61) is fixedly connected in the installation box (6), and one end of the constant force spring (61), away from the installation box (6), is fixedly connected with the inner top wall of the sliding groove (33).

9. The biomass-fired boiler gas recovery abatement device according to claim 7, characterized in that: The mounting pipe (8) is fixedly connected with a fixing frame (9) on the side away from the mounting frame (31), the fixing frame (9) is rotatably connected with a fan (91), the fan (91) is composed of a shaft and a plurality of fan blades, one end of the shaft of the fan (91) is fixedly connected with a sealing plate (92) through a support, and the sealing plate (92) is attached to the flow guide hole (81) of the mounting pipe (8).

10. The biomass-fired boiler gas recovery emission reduction device according to claim 1, characterized in that: The bottom of the mounting frame (31) is fixedly connected with the same number of wind-shielding arc plates (42) as the rotating wheels A (4), the wind-shielding arc plates (42) are located on the side of the rotating wheels A (4) corresponding to the positions of the wind-shielding arc plates (42), and the bottom of each wind-shielding arc plate (42) is fixedly connected with a bottom plate (43).

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