A thermal power plant boiler exhaust gas detection filtering device

Abstract

The application discloses a kind of thermal power plant boiler exhaust gas detection filtering device, it is related to waste gas treatment technical field.The present application includes outer bucket, and its inside fixed mounting has inner bucket, heat exchange pipeline is equipped between outer bucket and inner bucket, mounting plate is fixedly installed on outer bucket, pump body is equipped on mounting plate, the water inlet end of pump body is communicated with inner bucket by liquid inlet pipeline, filter box, its inside is opposite staggered and is equipped with multiple groups of flow guide plate assembly, spray pipe is rotatably connected on filter box, the drainage end of pump body is communicated with spray pipe by liquid delivery pipeline, reciprocating assembly that drive spray pipe reciprocating rotation is equipped on mounting plate, filter box and outer bucket are equipped with exhaust fan, and suction port of exhaust fan is communicated with heat exchange pipeline, and other end is communicated with filter box by gas delivery pipe.The present application is guided by multiple groups of flow guide plate assembly in filter box Waste gas moves along wavy path, prolongs residence time, can recover waste heat when cooling waste gas, improves the temperature of denitration solution, to improve reaction efficiency.

Description

Technical Field

[0001] This invention belongs to the field of waste gas treatment, specifically, it relates to a detection and filtration device for waste gas from a thermal power plant boiler. Background Technology

[0002] With the rapid development of industry, thermal power plants, as an important part of energy supply, generate a large amount of boiler exhaust gas containing pollutants such as sulfur dioxide, nitrogen oxides, and particulate matter during the production process. If these exhaust gases are discharged directly without effective treatment, they will not only cause environmental problems such as acid rain and smog, but also seriously threaten human health and ecological balance. However, traditional boilers lack detection and filtration structures, making it impossible to detect and filter the flue gas emitted by the boiler, which can easily cause pollution to the surrounding environment.

[0003] Chinese patent CN21625997U discloses a boiler exhaust gas detection and filtration device for thermal power plants. This device sprays a denitrification solution onto the inside of a filter box via a spray plate to denitrify the flue gas and adsorb dust. The flue gas then enters a steam-water separator, which separates the moisture from the flue gas. Finally, an exhaust device discharges the flue gas, achieving the advantage of detecting and filtering boiler exhaust gas. However, when the device circulates and extracts the denitrification solution from the filter box to denitrify the exhaust gas, the denitrification solution reacts with substances in the exhaust gas during the spraying process, inevitably reducing the concentration of the denitrification solution or even contaminating it, thus reducing the filtration effect on the exhaust gas.

[0004] In view of this, the present invention is proposed. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a detection and filtration device for exhaust gas from a thermal power plant boiler, which solves the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by the present invention is as follows:

[0007] A detection and filtration device for boiler exhaust gas in a thermal power plant includes: an outer barrel, an inner barrel fixedly installed inside the outer barrel, a heat exchange pipe provided between the outer barrel and the inner barrel, the heat exchange pipe being spirally wound around the inner barrel, an mounting plate fixedly installed on the outer barrel, a pump body provided on the mounting plate, and the water inlet end of the pump body being connected to the inner barrel through a liquid inlet pipe;

[0008] The filter box has multiple sets of guide plate assemblies arranged in an alternating vertical arrangement inside. A spray pipe is rotatably connected to the filter box. The drain end of the pump body is connected to the spray pipe through a liquid delivery pipe. A reciprocating assembly is provided on the mounting plate to drive the spray pipe to rotate back and forth. An exhaust fan is provided between the filter box and the outer barrel. The air intake of the exhaust fan is connected to the heat exchange pipe, and the other end is connected to the filter box through an air delivery pipe.

[0009] Optionally, a fixed cylinder communicating with the pump body and the infusion pipeline is fixedly mounted on the mounting plate. A stirring assembly is provided inside the inner cylinder. The stirring assembly includes a stirring shaft and stirring blades. A drive assembly for driving the stirring shaft to rotate is provided on the mounting plate. The drive assembly includes:

[0010] A first rotating shaft is rotatably disposed inside the fixed cylinder, and multiple partitions are fixedly installed on the first rotating shaft along its circumference.

[0011] A first bevel gear is rotatably mounted on the outer barrel via a second rotating shaft. A second bevel gear meshing with the first bevel gear is sleeved on the stirring shaft. A transmission assembly is provided between the first rotating shaft and the second rotating shaft.

[0012] Optionally, a movable plate assembly is slidably connected to the filter box, and the reciprocating assembly includes:

[0013] A second fixed plate is fixedly mounted on the mounting plate. A rotating rod is rotatably connected to the second fixed plate. A U-shaped rod is fixedly mounted on the rotating rod. A drive rod is fixedly mounted at the end of the rotating rod. The drive rod is movably mounted on the movable plate assembly.

[0014] A connecting plate, one end of which is fixedly mounted on the first rotating shaft, and the other end of which is sleeved and movably connected to a movable rod, the movable rod being sleeved and movably connected to a U-shaped rod;

[0015] The drive plate has one end fixedly mounted on the spray pipe and the other end movably mounted on the movable plate assembly.

[0016] Optionally, the transmission assembly includes:

[0017] The second gear is rotatably mounted on the fixed cylinder via a third rotating shaft, and the third rotating shaft and the second rotating shaft are connected by a belt drive mechanism.

[0018] The first gear is sleeved and fixedly mounted on the first rotating shaft, and the first gear meshes with the second gear.

[0019] Optionally, a scraper that fits against the inner wall of the inner barrel is fixedly installed on the stirring shaft.

[0020] Optionally, the movable plate assembly includes a sliding plate, a guide rod, and two first fixed plates. The two first fixed plates are fixedly mounted on the filter box, the guide rod is fixedly mounted between the two first fixed plates, the sliding plate is sleeved on and movably connected to the guide rod, the drive rod passes through and is movably connected to the sliding plate, the sliding plate is provided with a drive groove for the drive rod to move, and the drive plate is movably disposed on the sliding plate.

[0021] Optionally, the diameter of the first gear is smaller than the diameter of the second gear.

[0022] Optionally, the diameter of the first bevel gear is smaller than the diameter of the second bevel gear.

[0023] Optionally, the bottom of the sliding plate is rotatably connected to multiple sets of pulleys that can be slidably disposed on the filter box.

[0024] Optionally, the deflector assembly includes an integrally formed inclined plate and an arc-shaped plate.

[0025] Optionally, the arc-shaped plate is provided with multiple through holes.

[0026] By adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art. Of course, any product implementing the present invention does not necessarily need to achieve all of the following advantages at the same time:

[0027] 1. By setting up reciprocating components, heat exchange pipes, and guide plate components, the exhaust gas is guided to move along a wave-shaped path through multiple sets of guide plate components in the filter box, extending the residence time. The overall structure is simple to operate and highly automated. When cooling the exhaust gas, it can recover the waste heat of the exhaust gas and increase the temperature of the denitrification solution, thereby improving the reaction efficiency. At the same time, the reciprocating spray pipe expands the spray coverage area and enhances the mixing effect of the solution and the exhaust gas.

[0028] 2. By setting up a stirring component and a driving component, the driving component drives the stirring component to agitate the inner tank. The entire transmission process does not require external power such as a motor. It only relies on the fluid kinetic energy of the solution transported by the pump to drive the first rotating shaft. The rotation of the stirring component is realized through gear and belt transmission, which improves the energy utilization rate of the system and conforms to the green and energy-saving design concept. Without increasing the additional energy consumption, it improves the uniformity of the solution and the reliability of the system.

[0029] 3. By incorporating inclined plates, arc plates, and through holes, and through the composite structure design of inclined plate guidance, arc turbulence and through hole filtration, the three major functions of dust removal, denitrification and energy saving are innovatively integrated into the guide plate assembly. Its core advantage lies in improving the gas-liquid-solid three-phase interaction efficiency through flow field optimization, while utilizing structural characteristics to achieve self-cleaning and low-resistance operation.

[0030] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0031] The accompanying drawings described below are merely some embodiments. Those skilled in the art can obtain other drawings based on these drawings without any creative effort. In the drawings:

[0032] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0033] Figure 2 For the present invention Figure 1 A structural diagram from another perspective;

[0034] Figure 3 For the present invention Figure 2 Schematic diagram of the structure at point A;

[0035] Figure 4 This is a front view of the present invention;

[0036] Figure 5 This is a schematic diagram of the internal structure of the outer barrel of the present invention;

[0037] Figure 6 This is a schematic diagram of the structure of the stirring assembly of the present invention;

[0038] Figure 7 For the present invention Figure 6 Enlarged structural diagram at point B;

[0039] Figure 8 This is a schematic diagram of the internal structure of the filter box of the present invention;

[0040] Figure 9 For the present invention Figure 8 Front view;

[0041] Figure 10 This is a schematic diagram of the internal structure of the fixing cylinder of the present invention;

[0042] Figure 11 This is a schematic diagram of the pulley structure of the present invention.

[0043] The attached diagram lists the components represented by each number as follows:

[0044] 1. Filter box; 2. Drain pipe; 3. Exhaust pipe; 4. Baffle assembly; 41. Inclined plate; 42. Arc plate; 5. Heat exchange pipe; 6. Moving plate assembly; 61. Sliding plate; 62. Guide rod; 63. First fixed plate; 7. Stirring assembly; 71. Stirring shaft; 72. Stirring blade; 8. Drive assembly; 81. Partition plate; 82. First rotating shaft; 83. Transmission assembly; 831. First gear; 832. Second gear; 833. Third rotating shaft; 834. Belt drive mechanism; 84. Second rotating shaft; 85. First bevel gear; 86. Second bevel gear. 9. Gear; 10. Reciprocating assembly; 11. Rotating rod; 12. Second fixed plate; 13. U-shaped rod; 14. Movable rod; 15. Connecting plate; 16. Drive rod; 17. Drive plate; 18. Exhaust fan; 19. Air supply pipe; 10. Outer barrel; 11. Air inlet pipe; 12. Pump body; 13. Filter plate; 14. Spray head; 15. Rotary joint; 16. Drive groove; 17. Spray pipe; 28. Liquid supply pipe; 29. ​​Liquid inlet pipe; 20. Fixed cylinder; 21. Inner barrel; 22. Scraper; 23. Through hole; 24. Connecting groove; 25. Pulley; 26. Mounting plate.

[0045] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the invention in any way, but rather to illustrate the concept of the invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0046] The invention will now be described in further detail with reference to the accompanying drawings.

[0047] Please see Figure 1-11 As shown, this embodiment provides a boiler exhaust gas detection and filtration device for thermal power plants, including an outer barrel 12, inside which an inner barrel 23 is fixedly installed. A heat exchange pipe 5 is provided between the outer barrel 12 and the inner barrel 23. The heat exchange pipe 5 is spirally wound around the inner barrel 23. An installation plate 28 is fixedly installed on the outer barrel 12. A pump body 14 is provided on the installation plate 28. The water inlet end of the pump body 14 is connected to the inner barrel 23 through a liquid inlet pipe 21. A filter box 1 is provided inside which multiple sets of guide plate assemblies 4 are arranged in an alternating manner. A spray pipe 19 is rotatably connected to the filter box 1. The drain end of the pump body 14 is connected to the spray pipe 19 through a liquid delivery pipe 20. A reciprocating assembly 9 is provided on the installation plate 28 to drive the spray pipe 19 to reciprocate. An exhaust fan 10 is provided between the filter box 1 and the outer barrel 12. The air intake of the exhaust fan 10 is connected to the heat exchange pipe 5, and the other end is connected to the filter box 1 through a gas delivery pipe 11.

[0048] Specifically, in this embodiment, a filter plate 15 is fixedly installed inside the filter box 1. Multiple guide plate assemblies 4 are spaced apart along the length of the filter box 1 and are fixedly installed at the top of the filter box 1 and the filter plate 15, respectively. The filter box 1 contains a portion of the denitrification solution that falls from the spray pipe 19. The height of the denitrification solution in the filter box 1 must be higher than the height of the filter plate 15 in the filter box 1. The multiple filter plate assemblies 15 define a wave-shaped gas flow channel inside the filter box 1. An exhaust pipe 3 is connected to the position of the filter box 1 above the filter plate 15, and a drain pipe 2 is connected to the position of the filter box 1 below the filter plate 15. At the same time, there are multiple spray pipes 19, and multiple sets of guide plates 4 are rotatably arranged on the top of the filter box 1. On the flow plate assembly 4, one end of each of the multiple spray pipes 19 extends to the outside of the filter box 1 and connects to the infusion pipeline 20. Atomizing nozzles 16 are connected to each of the multiple spray pipes 19 along their length. The multiple spray pipes 19 and the infusion pipeline 20 are connected via a rotary joint 17. The reciprocating assembly 9 is configured to drive the multiple spray pipes 19 to reciprocate simultaneously. In the initial state, the heat exchange pipe 5 is spirally wrapped around the outer wall of the inner barrel 23. The inner barrel 23 is made of a heat-conducting material, and the outer barrel 12 is made of an insulating material. The end of the heat exchange pipe facing away from the exhaust fan 10 is connected to an air inlet pipe 13. The air inlet pipe 13 passes through and is fixedly installed on the outer barrel 12. The inner barrel 23 contains a denitrification solution, and high-temperature exhaust gas enters from the air inlet pipe 1 of the outer barrel 12. 3. The gas enters the spiral heat exchange pipe 5 and flows spirally around the inner barrel 23, exchanging heat with the environment between the inner barrel 23 and the outer barrel 12. The heat in the exhaust gas is transferred to the denitrification solution in the inner barrel 23 through the pipe wall, achieving exhaust gas cooling (e.g., from 180℃ to below 80℃). At the same time, it preheats the solution in the inner barrel 23 (e.g., heating the urea solution from room temperature to 60℃). The pump body 14 (e.g., a centrifugal pump) draws the solution from the inner barrel 23 through the liquid inlet pipe 21 and delivers it to the spray pipe 19 in the filter box 1 through the liquid delivery pipe 20. The reciprocating assembly 9 drives the spray pipe 19 to rotate back and forth (e.g., swing angle ±30°), spraying the solution evenly into the filter box 1 through the nozzle 16. Meanwhile, the exhaust gas, after being cooled by heat exchange, is drawn out by the exhaust fan 10. The exhaust gas is drawn in through the hot pipe 5 and sent into the filter box 1 through the gas delivery pipe 11. The exhaust gas is guided by multiple sets of guide plate assemblies 4 in the filter box 1 to move along a wave-shaped path, extending the residence time. The sprayed denitrification solution comes into countercurrent contact with the exhaust gas, and a denitrification reaction occurs. At the same time, the solution adsorbs particulate matter in the exhaust gas. The exhaust gas after the reaction carries the atomized solution and water and is discharged through the exhaust pipe 3 to subsequent equipment (such as a gas-water separator). The liquid can be discharged through the drain pipe 2 for further treatment. The overall structure is simple to operate and highly automated. When cooling the exhaust gas, it can recover the waste heat of the exhaust gas and increase the temperature of the denitrification solution, thereby improving the reaction efficiency. At the same time, the reciprocating spray pipe 19 expands the spray coverage area and enhances the mixing effect of the solution and the exhaust gas.

[0049] It should be noted that, in this embodiment, generally speaking, when a pulverized coal boiler is running at full load, the exhaust gas temperature at the furnace outlet is usually 800-1100℃. After heat recovery through heat exchange equipment such as superheaters, economizers, and air preheaters, the final exhaust gas temperature will drop to 120-180℃. This exhaust gas is discharged into the heat exchange tubes through the inlet pipe 13. Due to the constraints of the materials of the heat exchange tubes, inner tank 23, and outer tank 12, and with the continuous delivery of denitrification solution into the inner tank 23 by external conveying equipment, the inner tank 22... The temperature of the denitrification solution is controlled within a specified range to prevent the denitrification solution from reacting inside the inner tank 23. At the same time, in order to make the denitrification reaction inside the filter box 1 more efficient, a heating device can be installed inside it to increase the temperature inside the filter box 1. This is existing technology. Secondly, in this embodiment, a gas detector can be installed on the inlet pipe 13 or the gas delivery pipe 11 to monitor the composition of the exhaust gas in real time. For details, please refer to the prior art with patent publication number CN21625997U. This is existing technology and will not be described here.

[0050] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 10As shown, a fixed cylinder 22 communicating with the pump body 14 and the infusion pipeline 20 is fixedly installed on the mounting plate 28. A stirring assembly 7 is provided inside the inner cylinder 23. The stirring assembly 7 includes a stirring shaft 71 and stirring blades 72. A driving assembly 8 for driving the stirring shaft 71 to rotate is provided on the mounting plate 28. The driving assembly 8 includes a first rotating shaft 82, which is rotatably disposed inside the fixed cylinder 22. Multiple partitions 81 are fixedly installed on the first rotating shaft 82 along its circumference. A first bevel gear 85 is rotatably disposed on the outer cylinder 12 via a second rotating shaft 84. A second bevel gear 86 meshing with the first bevel gear 85 is sleeved on the stirring shaft 71. A connection is provided between the first rotating shaft 82 and the second rotating shaft 84. The transmission assembly 83 includes a second gear 832, which is rotatably mounted on the fixed cylinder 22 via a third rotating shaft 833. The third rotating shaft 833 and the second rotating shaft 84 are connected by a belt drive mechanism 834. A first gear 831 is sleeved and fixedly mounted on the first rotating shaft 82, and meshes with the second gear 832. The diameter of the first gear 831 is smaller than the diameter of the second gear 832, and the diameter of the first bevel gear 85 is smaller than the diameter of the second bevel gear 86. Specifically, in this embodiment, a communicating groove 26 is defined inside the fixed cylinder 22. The communicating groove 26 is a cylindrical cavity coaxial with the first rotating shaft 82. Multiple baffles 81 are arranged at rectangular intervals along the circumference of the first rotating shaft 82. The baffles 81 at the bottom of the fixed cylinder 22 have through-holes communicating with the pump body 14 and the infusion pipe 20. In use, the pump body 14 draws denitrification solution from the inner tank 23 through the inlet pipe 21 and delivers it to the area of ​​the first rotating shaft 82 within the fixed cylinder 22 via the infusion pipe 20. As the denitrification solution flows within the fixed cylinder 22, it impacts the baffles 81 on the first rotating shaft 82, causing the first rotating shaft 82 to rotate (driven by fluid power). The first gear 831 on the first rotating shaft 82 meshes with the second gear 832 fixed on the third rotating shaft 833, driving the third rotating shaft 833 to rotate. The three rotating shafts 833 are connected to the second rotating shaft 84 via a belt drive mechanism 834, transmitting power to the second rotating shaft 84. The first bevel gear 85 at the end of the second rotating shaft 84 meshes with the second bevel gear 86 on the stirring shaft 71, driving the stirring shaft 71 to rotate. This causes the stirring blades 72 to stir the denitrification solution in the inner tank 23. The entire transmission process does not require external power such as a motor. It only relies on the fluid kinetic energy of the solution transported by the pump body 14 to drive the first rotating shaft 82. The rotation of the stirring assembly 7 is achieved through gear and belt transmission, improving the system's energy utilization rate and conforming to the green and energy-saving design concept. Without increasing additional energy consumption, it improves the uniformity of the solution and the reliability of the system.

[0051] In this embodiment, as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 6 , Figure 7 , Figure 8 , Figure 9 and Figure 11 As shown, a movable plate assembly 6 is slidably connected to the filter box 1. The reciprocating assembly 9 includes a second fixed plate 92, which is fixedly mounted on the mounting plate 28. A rotating rod 91 is rotatably connected to the second fixed plate 92. A U-shaped rod 93 is fixedly mounted on the rotating rod 91. A drive rod 96 is fixedly mounted at the end of the rotating rod 91. The drive rod 96 is movably mounted on the movable plate assembly 6. A connecting plate 95 has one end fixedly mounted on the first rotating shaft 82, and the other end sleeved and movably connected to a movable rod 94. The movable rod 94 is sleeved and movably connected to the U-shaped rod 93. A drive plate 97 has one end fixedly mounted on the spray pipe 19, and the other end movably mounted on the movable plate assembly. The movable plate assembly 6 includes a sliding plate 61, a guide rod 62, and two first fixed plates 63. The two first fixed plates 63 are fixedly mounted on the filter box 1, and the guide rod 62 is fixedly mounted between the two first fixed plates 63. The sliding plate 61 is sleeved on and movably connected to the guide rod 62. The drive rod 96 passes through and is movably connected to the sliding plate 61. The sliding plate 61 is provided with a drive groove 18 for the drive rod 96 to move. The drive plate 97 is movably mounted on the sliding plate 61. Specifically, in this embodiment, the guide rod 62 adopts a polygonal structure, and the length of the movable rod 94 must ensure that it will not detach from the connecting plate 95. At the same time, the drive rod 96 is L-shaped. In this U-shaped structure, each spray pipe 19 is fixedly mounted with a drive plate 97. Each drive plate 97 is movably mounted on a sliding plate 61 via a rotating shaft. A groove is provided along the length of each drive plate 97 to allow the rotating shaft to move. When the first rotating shaft 82 rotates, it drives the connecting plate 95 fixed thereon to rotate synchronously. A movable rod 94, sleeved at the other end of the connecting plate 95, slides within the U-shaped rod as the connecting plate 95 rotates, simultaneously pushing the U-shaped rod to drive the axis of the rotating rod 91 to reciprocate. This causes the drive rod 96 at the end of the rotating rod 91 to reciprocate. When the rotating rod 91 swings, the drive rod 96 slides within the drive groove 18, forcing the sliding plate 61 to move along the guide rod 62. When the sliding plate 61 moves horizontally, the drive plate 97 rotatably connected to it moves accordingly. The other end of the drive plate 97 is fixedly connected to the spray pipe 19. Therefore, the drive plate 97 pushes the spray pipe 19 to reciprocate (oscillate) around its rotation fulcrum with the filter box 1 through translation. The overall automation level is high. The rotational motion of the first rotating shaft 82 is converted into the reciprocating oscillation of the spray pipe 19 through the mechanical linkage mechanism. The reaction efficiency of the denitrification solution and flue gas is significantly improved without increasing energy consumption. At the same time, the compact mechanical transmission design reduces the complexity of the equipment and maintenance costs, and further optimizes the overall performance of the boiler exhaust gas treatment device for thermal power plants.

[0052] In this embodiment, as Figure 5 and Figure 6As shown, a scraper 24 that fits against the inner wall of the inner barrel 23 is fixedly installed on the stirring shaft 71. Specifically, when the stirring shaft 71 rotates, the scraper 24 moves in a circular motion against the inner wall of the inner barrel 23. Through the physical contact of the scraper 24, crystals, precipitates or viscous residues attached to the inner wall of the inner barrel 23 are continuously scraped off, so as to avoid these substances from accumulating for a long time and affecting the volume of the inner barrel 23, the flow of the solution or the stirring effect.

[0053] In this embodiment, as Figure 11 As shown, the bottom of the sliding plate 61 is rotatably connected to multiple sets of pulleys 27 that are slidably mounted on the filter box 1. Specifically, the pulleys 27 are mounted on the bottom of the sliding plate 61 via a rotating shaft, and their outer rings are in contact with the preset track of the filter box 1. When the sliding plate 61 is driven by the reciprocating assembly 9 to slide horizontally along the guide rod 62, the pulleys 27 reduce the mechanical resistance between the sliding plate 61 and the filter box 1 through rolling contact, thus avoiding jamming or wear caused by rigid friction.

[0054] In this embodiment, as Figure 8 and Figure 9 As shown, the guide plate assembly 4 includes an integrally formed inclined plate 41 and an arc-shaped plate 42. Multiple through holes 25 are provided on the arc-shaped plate 42. Specifically, in this embodiment, after the flue gas enters the filter box 1, it first impacts the inclined plate 41. Due to the tilt angle of the inclined plate 41 (e.g., 45-60 degrees), the flow direction is changed, forcing it to diffuse towards the area of ​​the arc-shaped plate 42. After being guided by the inclined plate 41, the flue gas impacts the arc-shaped plate 42. The arc-shaped surface forces the airflow to form a turbulent effect (i.e., irregular vortex flow), prolonging the gas-liquid contact time and improving the reaction efficiency. The through holes 25 (typically 2-5 mm in diameter) on the arc-shaped plate 42 allow the flue gas to pass through. As air passes through, it mechanically separates larger particles (e.g., ≥10μm), with some particles being intercepted on the surface of the arc-shaped plate 42. Smaller particles pass through the through-holes 25 with the airflow and continue to react with the sprayed denitrification solution. The through-holes 25 also facilitate the discharge of the denitrification solution to the bottom of the filter box 1. Through the composite structural design of the inclined plate 41 for guidance, the arc-shaped turbulence and the through-holes 25 for filtration, the three major functions of dust removal, denitrification and energy saving are innovatively integrated into the guide plate assembly 4. Its core advantage lies in improving the gas-liquid-solid three-phase interaction efficiency through flow field optimization, while utilizing structural characteristics to achieve self-cleaning and low-resistance operation.

[0055] Working principle:

[0056] Initially, the heat exchange pipe 5 is spirally wrapped around the outer wall of the inner barrel 23. The inner barrel 23 is made of thermally conductive material, and the outer barrel 12 is made of heat-insulating material. The end of the heat exchange pipe away from the exhaust fan 10 is connected to the air inlet pipe 13, which runs through and is fixedly installed on the outer barrel 12. The inner barrel 23 contains a denitrification solution. High-temperature exhaust gas enters the spiral heat exchange pipe 5 from the air inlet pipe 13 of the outer barrel 12, flows spirally around the inner barrel 23, and exchanges heat with the environment between the inner barrel 23 and the outer barrel 12. The heat in the exhaust gas is transferred to the denitrification solution in the inner barrel 23 through the pipe wall, achieving exhaust gas cooling (e.g., from 180℃ to below 80℃), and preheating the solution in the inner barrel 23 (e.g., heating the urea solution from room temperature to 60℃). The pump body 14 (e.g., a centrifugal pump) is connected to the inner barrel 23. Solution is drawn from inner tank 23 through inlet pipe 21 and delivered to spray pipe 19 in filter box 1 via delivery pipe 20. At the same time, pump body 14 draws denitrification solution from inner tank 23 through inlet pipe 21 and delivers it to the area of ​​first rotating shaft 82 in fixed cylinder 22 via delivery pipe 20. When the denitrification solution flows in fixed cylinder 22, it impacts baffle 81 on first rotating shaft 82, driving first rotating shaft 82 to rotate (driven by fluid power). First gear 831 on first rotating shaft 82 meshes with second gear 832 fixed on third rotating shaft 833, driving third rotating shaft 833 to rotate. Third rotating shaft 833 is connected to second rotating shaft 84 through belt drive mechanism 834, transmitting power to second rotating shaft 84. First bevel gear at the end of second rotating shaft 84 The first rotating shaft 85 meshes with the second bevel gear 86 on the stirring shaft 71, driving the stirring shaft 71 to rotate. This causes the stirring blades 72 to stir the denitrification solution in the inner tank 23. When the first rotating shaft 82 rotates, it drives the connecting plate 95 fixed on it to rotate synchronously. The movable rod 94 sleeved on the other end of the connecting plate 95 slides in the U-shaped rod as the connecting plate 95 rotates, simultaneously pushing the U-shaped rod to drive the axis of the rotating rod 91 to reciprocate, causing the drive rod 96 at the end of the rotating rod 91 to reciprocate. When the rotating rod 91 swings, the drive rod 96 slides in the drive groove 18, forcing the sliding plate 61 to move horizontally along the guide rod 62. When the sliding plate 61 moves, the drive plate 97 rotatably connected to it moves accordingly. The other end of the drive plate 97 is fixedly connected to the spray pipe 19. Therefore, the drive plate 97 pushes the spray pipe 19 to reciprocate (oscillate) around its pivot point with the filter box 1 by translation, so that the solution is evenly sprayed into the filter box 1 through the nozzle 16. At the same time, the exhaust gas after heat exchange and cooling is drawn in from the heat exchange pipe 5 by the exhaust fan 10 and sent into the filter box 1 through the air supply pipe 11. The exhaust gas is guided by multiple sets of guide plate assemblies 4 in the filter box 1 to move along a wave-shaped path, prolonging the residence time. The sprayed denitrification solution comes into countercurrent contact with the exhaust gas and a denitrification reaction occurs. At the same time, the solution adsorbs particulate matter in the exhaust gas. The reacted exhaust gas, carrying the atomized solution and water, is discharged along the exhaust pipe 3 to subsequent equipment (such as a steam-water separator, etc.), while the liquid can be discharged along the drain pipe 2 for further treatment. The overall structure is simple to operate and has a high degree of automation.The cooling process recovers waste heat from the exhaust gas, raising the temperature of the denitrification solution and thus improving reaction efficiency. Simultaneously, the reciprocating spray pipe 19 expands the spray coverage area, enhancing the mixing effect between the solution and the exhaust gas.

[0057] This invention is not limited to the embodiments described above. Anyone should understand that structural changes made under the guidance of this invention, and any technical solutions that are the same as or similar to this invention, fall within the protection scope of this invention. Technical aspects, shapes, and structures not described in detail in this invention are all publicly known technologies.

Claims

1. A detection and filtration device for exhaust gas from a thermal power plant boiler, characterized in that, include: An outer barrel (12) has an inner barrel (23) fixedly installed inside it. A heat exchange pipe (5) is provided between the outer barrel (12) and the inner barrel (23). The heat exchange pipe (5) is spirally wound around the inner barrel (23). An mounting plate (28) is fixedly installed on the outer barrel (12). A pump body (14) is provided on the mounting plate (28). The water inlet end of the pump body (14) is connected to the inner barrel (23) through a liquid inlet pipe (21). A fixed cylinder (22) connected to the pump body (14) and the liquid delivery pipe (20) is fixedly installed on the mounting plate (28). A stirring assembly (7) is provided inside the inner barrel (23). The stirring assembly (7) includes a stirring shaft (71) and stirring blades (72). A driving assembly (8) for driving the stirring shaft (71) to rotate is provided on the mounting plate (28). The driving assembly (8) includes a first rotating shaft (82) and a first bevel gear (85). The first rotating shaft (82) The first rotating shaft (82) is rotatably disposed inside the fixed cylinder (22). Multiple partitions (81) are fixedly installed on the first rotating shaft (82) along its circumferential direction. The first bevel gear (85) is rotatably disposed on the outer barrel (12) through the second rotating shaft (84). The stirring shaft (71) is fitted with a second bevel gear (86) that meshes with the first bevel gear (85). A transmission assembly (83) is provided between the first rotating shaft (82) and the second rotating shaft (84). The transmission assembly (83) includes a second gear (832) and a first gear (831). The second gear (832) is rotatably disposed on the fixed cylinder (22) through the third rotating shaft (833). The third rotating shaft (833) and the second rotating shaft (84) are connected by a belt transmission mechanism (834). The first gear (831) is fitted and fixedly installed on the first rotating shaft (82). The first gear (831) meshes with the second gear (832). The filter box (1) has multiple sets of guide plate assemblies (4) arranged in an alternating pattern. A spray pipe (19) is rotatably connected to the filter box (1). The drain end of the pump body (14) is connected to the spray pipe (19) through a liquid delivery pipe (20). A reciprocating assembly (9) is provided on the mounting plate (28) to drive the spray pipe (19) to rotate back and forth. An exhaust fan (10) is provided between the filter box (1) and the outer barrel (12). The air intake of the exhaust fan (10) is connected to the heat exchange pipe (5). The other end is connected to the filter box (1) through the air supply pipe (11). A movable plate assembly (6) is slidably connected to the filter box (1). The reciprocating assembly (9) includes a second fixed plate (92), a connecting plate (95), and a drive plate (97). The second fixed plate (92) is fixedly installed on the mounting plate (28). A rotating rod (91) is rotatably connected to the second fixed plate (92). A U-shaped rod (93) is fixedly installed on the rotating rod (91). The end of the rotating rod (91) is fixedly installed with... A drive rod (96) is movably mounted on the movable plate assembly (6). One end of the connecting plate (95) is fixedly mounted on the first rotating shaft (82), and the other end is sleeved and movably connected to a movable rod (94). The movable rod (94) is sleeved and movably connected to a U-shaped rod (93). One end of the drive plate (97) is fixedly mounted on the spray pipe (19), and the other end is movably mounted on the movable plate assembly (6). The movable plate assembly (6) includes a sliding plate (61) and a guide rod (62). Two first fixed plates (63) are fixedly installed on the filter box (1) and the guide rod (62) is fixedly installed between the two first fixed plates (63). The sliding plate (61) is sleeved on and movably connected to the guide rod (62). The drive rod (96) passes through and is movably connected to the sliding plate (61). The sliding plate (61) is provided with a drive groove (18) for the drive rod (96) to move. The drive plate (97) is movably arranged on the sliding plate (61). The deflector assembly (4) includes an integrally formed inclined plate (41) and an arc-shaped plate (42). The arc-shaped plate (42) has multiple through holes (25).

2. The boiler exhaust gas detection and filtration device for thermal power plants according to claim 1, characterized in that, A scraper (24) that fits against the inner wall of the inner barrel (23) is fixedly installed on the stirring shaft (71).

3. The boiler exhaust gas detection and filtration device for thermal power plants according to claim 1, characterized in that, The diameter of the first gear (831) is smaller than the diameter of the second gear (832).

4. The boiler exhaust gas detection and filtration device for thermal power plants according to claim 3, characterized in that, The diameter of the first bevel gear (85) is smaller than the diameter of the second bevel gear (86).

5. The boiler exhaust gas detection and filtration device for thermal power plants according to claim 1, characterized in that, The bottom of the sliding plate (61) is rotatably connected to multiple sets of pulleys (27) that can be slidably disposed on the filter box (1).

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