A boiler flue gas treatment device and method

Abstract

This invention relates to the field of flue gas treatment technology, and discloses a boiler flue gas treatment device and method. The boiler flue gas treatment device, used for flue gas purification, includes a flue gas recovery box, an inlet pipe and an outlet pipe respectively disposed at both ends of the flue gas recovery box, a purification pipe disposed at the end of the outlet pipe away from the flue gas recovery box, a sedimentation pipe and a sprayer disposed outside the purification pipe, a water supply pipe disposed at the end of the sprayer away from the purification pipe, an exchange pipe disposed inside the flue gas recovery box, and auxiliary exchange components disposed outside the exchange pipe. This boiler flue gas treatment device and method, by using a sprayer, sprays a neutralizing agent after the flue gas enters the purification pipe. The neutralizing agent is absorbed into the flue gas and reacts with harmful gases in the oxygen. The resulting reactants and dust in the flue gas fall into the sedimentation pipe along with the neutralizing agent, thus purifying the flue gas and ensuring the cleanliness of the emitted flue gas.

Description

Technical Field

[0001] This invention relates to the field of flue gas treatment technology, and in particular to a boiler flue gas treatment device and method. Background Technology

[0002] In modern industrial production and daily life, boilers play a crucial role as widely used energy conversion devices. They input chemical energy and electrical energy from fuel and output steam, high-temperature water, or organic heat carriers with a certain amount of thermal energy. Heat pipe boilers are highly efficient and energy-saving boilers that utilize heat pipe technology to enhance heat exchange. When a boiler is operating, the gaseous mixture produced after burning fuels (such as coal, natural gas, biomass, and oil) is called boiler flue gas.

[0003] The existing technology has the following drawbacks: The composition and characteristics of flue gas are closely related to fuel type, combustion efficiency, boiler type and environmental protection treatment process. The most harmful substances in the flue gas are sulfides. If they are emitted directly without effective treatment, they will pose a serious threat to the environment and human health.

[0004] Since flue gas contains a large amount of heat energy that can be recovered and reused, it is necessary to pass the flue gas into the heat exchange equipment during heat recovery. This flue gas contains a large amount of dust. After the dust comes into contact with the heat exchange pipes, it may adhere to the outside of the heat exchange pipes, causing the heat exchange efficiency of the heat exchange pipes to decrease. At the same time, the water medium flowing inside the heat exchange pipes will also produce scale on the inside of the pipes, which will further reduce the heat exchange efficiency. Summary of the Invention

[0005] In view of the problem of dust and scale adhering to heat exchange pipes in existing technologies, a boiler flue gas treatment device and method are proposed.

[0006] This application provides a boiler flue gas treatment device and method, the purpose of which is to clean dust and scale on heat exchange pipes.

[0007] The technical solution of the present invention is as follows: a boiler flue gas treatment device for flue gas purification, including a flue gas recovery box, an inlet pipe and an outlet pipe respectively disposed at both ends of the flue gas recovery box, a purification pipe disposed at the end of the outlet pipe away from the flue gas recovery box, a sedimentation pipe and a sprayer disposed outside the purification pipe, a water supply pipe disposed at the end of the sprayer away from the purification pipe, an exchange pipe disposed inside the flue gas recovery box, an auxiliary exchange component disposed outside the exchange pipe, and a water storage tank disposed at the top of the flue gas recovery box, a water inlet pipe disposed at the bottom of the flue gas recovery box, and a connecting pipe disposed between the flue gas recovery box and the water storage tank; The purification pipe is L-shaped, with the sedimentation pipe located at the bottom of the bend in the purification pipe, the sprayer located in the vertical part of the purification pipe, and the exchange pipe connecting the inlet pipe and the connecting pipe.

[0008] Furthermore, the auxiliary switching component specifically includes a main board arranged in a linear array on the outside of the switching tube, a sub-board arranged at the bottom of the main board, a mounting slot opened at the bottom of the main board, a resonant spring arranged inside the mounting slot, and a sealing plate arranged at the opening of the mounting slot. The channels between the main boards are parallel to the direction of flue gas flow, the channels between the sub-boards are parallel to the direction of flue gas flow, and the mounting slots are distributed on the edge of the main boards.

[0009] Furthermore, the upper surface of the motherboard is configured as an arched arc surface, and the lower surface is configured as a plane.

[0010] Furthermore, a cleaning assembly is provided inside the exchange tube. The cleaning assembly specifically includes an upper limit ring disposed at the upper opening of the exchange tube, a lower limit ring disposed at the lower opening of the exchange tube, a moving ring disposed between the upper limit ring and the lower limit ring, a partition mesh disposed inside the moving ring, and a rotating shaft disposed outside the partition mesh. The movable ring is slidably connected inside the exchange tube. The outer wall of the movable ring is in contact with the inner wall of the exchange tube, and the outer wall of the movable ring is provided with friction texture. The rotating shaft penetrates the inner wall of the movable ring.

[0011] Furthermore, the cleaning assembly also includes an elastic rod disposed above the moving ring and a tapping block disposed on the top of the elastic rod; The inner wall of the exchange tube is provided with an annular groove, and the surface of the striking block protrudes outward, with the protruding part stuck in the annular groove.

[0012] Furthermore, the cleaning assembly also includes a sliding hole at the top of the moving ring, a through hole at the outside of the rotating shaft, an upper push rod and a lower push rod at the inside of the sliding hole, a locking rod at the inside of the through hole, and a top rod at the top of the lower limit ring. The sliding hole and the through hole are connected. The two ends of the locking rod extend to the outer contour surface of the rotating shaft. The upper push rod and the lower push rod are distributed at both ends of the locking rod. The top rod passes through the sliding hole.

[0013] Furthermore, the flue gas recovery box is provided with an inner frame that connects the exchange pipe, the water inlet pipe and the connecting pipe. The inner frame specifically includes an upper water tank located at the top of the inner side of the flue gas recovery box, a lower water tank located at the bottom of the inner side of the flue gas recovery box, and a support column located between the upper water tank and the lower water tank. The upper end of the exchange pipe extends into the upper water tank, and the lower end extends into the lower water tank. The connecting pipe connects to the upper water tank, and the inlet pipe connects to the lower water tank.

[0014] Furthermore, the inner frame also includes a bottom frame disposed inside the lower water tank, flow holes and through holes disposed on the surface of the bottom frame, and sedimentation pipe disposed inside the through holes; The bottom frame divides the internal space of the lower water tank into upper and lower parts. The through holes are located directly below the exchange pipe, and the flow holes are located in the gaps between the through holes. The sedimentation pipe extends upward to the inner bottom wall of the lower water tank.

[0015] Furthermore, the exhaust pipe between the upper water tank and the storage tank extends upward to the bottom of the inner side of the storage tank, and the exhaust pipe extends upward to the top of the inner side of the storage tank.

[0016] Furthermore, the present invention also provides a boiler flue gas treatment method, comprising the following steps: Flue gas collection: The flue gas is discharged from the boiler exhaust port and allowed to flow along the pipeline; Flue gas settling: The flue gas is directed out of the settling tower, allowing it to flow from bottom to top; One-stage recovery: The flue gas is introduced into a high-heat recovery device to exchange heat with the air in the boiler gas supply equipment; Secondary recovery; the flue gas is then introduced into the flue gas recovery box, where the flue gas and water exchange heat. Flue gas emission: Flue gas flows into the purification pipe, a sprayer sprays a neutralizing agent, and the flue gas is discharged after reacting with the neutralizing agent.

[0017] The beneficial effects of this invention are: 1. By installing a sprayer, after the flue gas enters the purification pipe, the sprayer sprays a neutralizing agent. The neutralizing agent is sprayed into the flue gas and reacts with the harmful gases in the oxygen. The reactants and dust in the flue gas fall into the sedimentation pipe along with the neutralizing agent, thus purifying the flue gas and ensuring the cleanliness of the emitted flue gas.

[0018] 2. By setting auxiliary exchange components, the heat exchange area of ​​the main board and the distribution board can be increased when the flue gas flows, thereby increasing the heat exchange efficiency. When the flue gas flows between the distribution boards, the distribution boards will vibrate due to airflow interference. The vibration force is transmitted to the main board and forms a compound vibration with the resonant spring. This will cause the dust adhering to the surface of the main board and the distribution board to fall off, and the difficulty of dust adhering to both will also increase. This can ensure the heat exchange efficiency of the exchange tube.

[0019] 3. By setting the upper surface of the motherboard as an arched arc and the lower surface as a flat plane, the flue gas flows faster near the top of the motherboard and slower near the bottom. This creates a difference in the flow velocity of the flue gas flowing through the channel between adjacent motherboards. The unstable airflow will aggravate the vibration of the boards, making it more difficult for dust to adhere and further ensuring the heat exchange efficiency of the heat exchange tubes.

[0020] 4. By setting up a cleaning component, when water is added, the water flows upward along the exchange tube, pushing the screen and moving ring to move. The moving ring rubs against the inner wall of the exchange tube, causing the scale attached to it to fall off. This can improve the heat exchange efficiency of the exchange tube. At the same time, the tapping block continuously taps the exchange tube as it follows the moving ring, causing the exchange tube to vibrate, which can accelerate the removal of dust and scale.

[0021] 5. By setting up an upper push rod, a locking rod, and a lower push rod, when the moving ring is below the exchange pipe, the locking rod locks the rotating shaft, and the screen is intercepted inside the moving ring, so that the water flow can give the screen and the moving ring a greater thrust, resulting in a better cleaning effect on the inner wall of the exchange pipe. When the moving ring is above the exchange pipe, the rotating shaft unlocks, the screen flips and opens the inside of the moving ring, ensuring smooth water flow and reducing water supply pressure.

[0022] 6. By installing a sedimentation pipe, when water is supplied, the water flows upward from the flow hole to the exchange pipe, while the scale that detaches from the exchange pipe falls downward into the sedimentation pipe. This prevents the scale from flowing back into the exchange pipe with the water flow, which helps to improve the cleaning effect inside the exchange pipe. Attached Figure Description

[0023] Figure 1 This is a perspective view of the boiler flue gas treatment device of the present invention; Figure 2 This is a schematic diagram of the flue gas recovery box of the present invention; Figure 3 This is an exploded view of the present invention; Figure 4 This is a schematic diagram of the internal frame of the present invention; Figure 5 This is a breakdown diagram of the internal frame of the present invention; Figure 6 This is a schematic diagram of the switching tube of the present invention; Figure 7 This is a schematic diagram of the auxiliary exchange component of the present invention; Figure 8 This is a schematic diagram of the cleaning component of the present invention; Figure 9 This is a schematic diagram of the moving ring of the present invention; Figure 10 This is a split view of the water tank of the present invention; Figure 11 For the present invention Figure 10 Second-person perspective; Figure 12 This is a front view of the present invention; Figure 13 This is a cross-sectional view of the present invention; Figure 14 This is a cross-sectional view of the exchange pipe of the present invention; Figure 15 For the present invention Figure 14 Schematic diagram of the upper end of the intermediate exchange tube; Figure 16 For the present invention Figure 14 Schematic diagram of the lower end of the intermediate switching tube; Figure 17 For the present invention Figure 16 Schematic diagram of the lower limit ring; Figure 18 For the present invention Figure 17 Enlarged view of point A in the middle.

[0024] In the picture: 1. Flue gas recovery box; 2. Inlet pipe; 21. Exhaust pipe; 3. Water tank; 4. Exchange pipe; 5. Auxiliary exchange components; 51. Main board; 52. Sub-board; 53. Mounting slot; 54. Resonance spring; 55. Sealing plate; 6. Water inlet pipe; 7. Connecting pipe; 71. Exhaust pipe; 8. Inner frame; 81. Upper water tank; 82. Lower water tank; 83. Support column; 84. Base frame; 85. Flow hole; 86. Interleaving 87. Hole; 9. Sedimentation tube; 10. Cleaning component; 11. Upper limit ring; 12. Lower limit ring; 13. Moving ring; 14. Partition net; 15. Rotating shaft; 16. Elastic rod; 17. Beating block; 18. Sliding hole; 19. Through hole; 10. Upper push rod; 10. Locking rod; 11. Lower push rod; 12. Top rod; 13. Purification tube; 14. Sedimentation tube; 15. Sprayer; 16. Water supply tube. Detailed Implementation

[0025] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0026] Example 1, referring to Figures 1-15 This first embodiment of the invention provides a boiler flue gas treatment device for flue gas purification, including a flue gas recovery box 1, an inlet pipe 2 and an outlet pipe 21 respectively disposed at both ends of the flue gas recovery box 1, a purification pipe 10 disposed at the end of the outlet pipe 21 away from the flue gas recovery box 1, a sedimentation pipe 11 and a sprayer 12 disposed outside the purification pipe 10, a water supply pipe 13 disposed at the end of the sprayer 12 away from the purification pipe 10, an exchange pipe 4 disposed inside the flue gas recovery box 1, an auxiliary exchange component 5 disposed outside the exchange pipe 4, a water storage tank 3 disposed at the top of the flue gas recovery box 1, a water inlet pipe 6 disposed at the bottom of the flue gas recovery box 1, and a connecting pipe 7 disposed between the flue gas recovery box 1 and the water storage tank 3.

[0027] Specifically, the purification pipe 10 is L-shaped, the sedimentation pipe 11 is located at the bottom of the bent part of the purification pipe 10 and is welded to it, the sprayer 12 is located in the vertical part of the purification pipe 10 and extends into the interior of the purification pipe 10, and the water supply pipe 13 is connected to the neutralizing agent supply tank.

[0028] By setting up a sprayer 12, after the flue gas enters the purification pipe 10, the sprayer 12 sprays a neutralizing agent. The neutralizing agent is sprayed into the flue gas and reacts with the harmful gases in the oxygen. The reactants and dust in the flue gas fall into the sedimentation pipe 11 along with the neutralizing agent, thus purifying the flue gas and ensuring the cleanliness of the emitted flue gas.

[0029] The auxiliary exchange component 5 specifically includes a main board 51 arranged in a linear array on the outside of the exchange tube 4, a sub-board 52 located at the bottom of the main board 51, a mounting groove 53 located at the bottom of the main board 51, a resonant spring 54 located inside the mounting groove 53, and a sealing plate 55 located at the opening of the mounting groove 53.

[0030] Specifically, the flue gas recovery box 1 is provided with a support leg on the top, the water storage tank 3 is fixed to the top of the flue gas recovery box 1 by a bracket, the top of the water storage tank 3 is provided with a drain pipe, the water storage tank 3 is provided with a liquid level sensor, the exchange pipes 4 are arranged in an array inside the flue gas recovery box 1, the exchange pipes 4 are connected to the water inlet pipe 6 and the connecting pipe 7, the connecting pipe 7 is connected to the water supply equipment, the main board 51 is sleeved on the outside of the exchange pipe 4, the channel between the main boards 51 is parallel to the flue gas flow direction, the channel between the sub-boards 52 is parallel to the flue gas flow direction, the main board 51 and the sub-boards 52 are welded, the bottom end of the sub-board 52 is attached to the upper surface of the lower main board 51, the thickness of the main board 51 is not less than 5 mm, the thickness of the sub-board 52 is not more than 1 mm, the mounting grooves 53 are distributed on the edge of the main board 51, and the outer contour of the resonant spring 54 is attached to the inner wall of the mounting groove 53.

[0031] By setting up auxiliary exchange component 5, when flue gas flows, the heat exchange area of ​​the main board 51 and the distribution plate 52 can be increased, thereby increasing the heat exchange efficiency. When the flue gas flows between the distribution plates 52, the distribution plates 52 will vibrate due to airflow interference. The vibration force is transmitted to the main board 51, forming a compound vibration with the resonant spring 54. This will cause the dust adhering to the surface of the main board 51 and the distribution plate 52 to fall off, and the difficulty of dust adhering to both will also increase. In this way, the heat exchange efficiency of the exchange tube 4 can be guaranteed.

[0032] Specifically, the upper surface of the motherboard 51 is set as an arched arc surface, and the lower surface is set as a flat surface. In this way, when the flue gas flows, the flue gas near the top of the motherboard 51 flows faster and the flue gas near the bottom of the motherboard 51 flows slower. This makes the flue gas flowing through the channel between the upper and lower adjacent motherboards 51 have different flow velocities. The unstable airflow will aggravate the vibration of the partition board 52, making it more difficult for dust to adhere, and further ensuring the heat exchange efficiency of the heat exchange tube 4.

[0033] Example 2, refer to Figures 1-18This is the second embodiment of the present invention. The difference between this embodiment and the first embodiment is that a cleaning component 9 is provided inside the exchange tube 4. The cleaning component 9 specifically includes an upper limit ring 91 provided at the upper opening of the exchange tube 4, a lower limit ring 92 provided at the lower opening of the exchange tube 4, a moving ring 93 provided between the upper limit ring 91 and the lower limit ring 92, a partition 94 provided inside the moving ring 93, and a rotating shaft 95 provided outside the partition 94. The cleaning component 9 also includes an elastic rod 96 provided above the moving ring 93 and a tapping block 97 provided at the top of the elastic rod 96.

[0034] Specifically, the upper limit ring 91 and the lower limit ring 92 are both threadedly connected to the exchange pipe 4. The moving ring 93 is slidably connected inside the exchange pipe 4. The outer wall of the moving ring 93 is in contact with the inner wall of the exchange pipe 4, and the outer wall of the moving ring 93 is provided with friction texture. The partition 94 divides the inner space of the moving ring 93 vertically to control the flow rate inside the moving ring 93. The rotating shaft 95 penetrates into the inner wall of the moving ring 93, and the partition 94 is rotatably installed inside the moving ring 93 through the rotating shaft 95. The inner wall of the exchange pipe 4 is provided with an annular groove, which is distributed in a linear array along the central axis of the exchange pipe 4. The surface of the striking block 97 protrudes outward, and the protruding part is stuck in the annular groove.

[0035] By setting up the cleaning component 9, when water is added, the water flows upward along the exchange pipe 4, pushing the partition 94 and the moving ring 93 to move. The moving ring 93 rubs against the inner wall of the exchange pipe 4, causing the scale attached to it to fall off, thus improving the heat exchange efficiency of the exchange pipe 4. At the same time, the striking block 97 continuously strikes the exchange pipe 4 as it moves with the moving ring 93, causing the exchange pipe 4 to vibrate, which can accelerate the removal of dust and scale.

[0036] The cleaning assembly 9 also includes a sliding hole 98 on the top of the moving ring 93, a through hole 99 on the outside of the rotating shaft 95, an upper push rod 910 and a lower push rod 912 on the inside of the sliding hole 98, a locking rod 911 on the inside of the through hole 99, and a top rod 913 on the top of the lower limit ring 92.

[0037] Specifically, a return torsion spring is provided on the outer side of the rotating shaft 95 so that the mesh 94 returns to a horizontal state when no force is applied. The sliding hole 98 is connected to the through hole 99. The two ends of the locking rod 911 extend to the outer contour surface of the rotating shaft 95. The upper push rod 910 and the lower push rod 912 are distributed at both ends of the locking rod 911. The top rod 913 passes through the sliding hole 98. The moving ring 93 and the mesh 94 are made of high-molecular plastic with a density slightly greater than that of water. When water is added, the water flow pushes the mesh 94 open and flows through the inside of the moving ring 93. The force exerted by the flowing water on the moving ring 93 and the mesh 94 is sufficient to lift them up.

[0038] By setting up the upper push rod 910, the locking rod 911, and the lower push rod 912, when the moving ring 93 is below the exchange pipe 4, the locking rod 911 locks the rotating shaft 95, and the screen 94 is intercepted inside the moving ring 93, so that the water flow can give the screen 94 and the moving ring 93 a greater thrust, resulting in a better cleaning effect on the inner wall of the exchange pipe 4. When the moving ring 93 is above the exchange pipe 4, the rotating shaft 95 is unlocked, and the screen 94 flips to open the inside of the moving ring 93, ensuring smooth water flow and reducing water supply pressure.

[0039] The flue gas recovery box 1 is equipped with an inner frame 8 that connects the exchange pipe 4, the water inlet pipe 6 and the connecting pipe 7. The inner frame 8 specifically includes an upper water tank 81 located at the top of the inner side of the flue gas recovery box 1, a lower water tank 82 located at the bottom of the inner side of the flue gas recovery box 1, and a support column 83 located between the upper water tank 81 and the lower water tank 82.

[0040] Specifically, four support pillars 83 are provided. The support pillars 83 are connected to the upper water tank 81 and the lower water tank 82 by bolts. The upper end of the exchange pipe 4 passes through the upper water tank 81 and the lower end of the exchange pipe 4 passes through the lower water tank 82. The connecting pipe 7 is connected to the upper water tank 81 and the inlet pipe 6 is connected to the lower water tank 82.

[0041] The inner frame 8 also includes a bottom frame 84 disposed inside the lower water tank 82, a flow hole 85 and an insertion hole 86 disposed on the surface of the bottom frame 84, and a sedimentation pipe 87 disposed inside the insertion hole 86.

[0042] Specifically, the bottom frame 84 divides the internal space of the lower water tank 82 into upper and lower parts, the through holes 86 are located directly below the exchange pipe 4, the flow holes 85 are located in the gap between the through holes 86, and the sedimentation pipe 87 extends upward to the inner bottom wall of the lower water tank 82 and is inserted into the through holes 86.

[0043] By setting up a sedimentation pipe 87, when water is supplied, the water flows upward from the flow hole 85 to the exchange pipe 4, and the scale that detaches from the exchange pipe 4 falls downward into the sedimentation pipe 87. This prevents the scale from flowing back into the exchange pipe 4 with the water flow, which helps to improve the cleaning effect inside the exchange pipe 4.

[0044] Specifically, the vent pipe 71 between the upper water tank 81 and the storage tank 3 extends upward to the bottom of the inner side of the storage tank 3, and the vent pipe 71 extends upward to the top of the inner side of the storage tank 3. The top of the upper water tank 81 is arched, and the vent pipe 71 is located at the highest point of the arch. In this way, when the water is heated into a gaseous state in the exchange pipe 4, it can be directly discharged from the vent pipe 71, avoiding the water vapor from coming into contact with the water in the storage tank 3 and liquefying due to temperature drop, requiring reheating.

[0045] The remaining structure is the same as that in Example 1.

[0046] Based on embodiments 1-2, the working principle of the boiler flue gas treatment device of the present invention is as follows: The flue gas is fed into the flue gas recovery box 1 through the flue gas inlet pipe 2. After passing through the exchange pipe 4 and the auxiliary exchange component 5, the flue gas flows out from the exhaust pipe 21. Water is fed into the lower water tank 82 through the water inlet pipe 6. The water flows to the bottom frame 84. As the water is continuously fed in and fills this space, the water overflows from the flow hole 85 and gradually fills the entire lower water tank 82. Then the water begins to enter the exchange pipe 4 and flows upward along the exchange pipe 4 into the upper water tank 81. Then it flows into the water storage tank 3 through the connecting pipe 7. When the water volume occupies half of the volume of the water storage tank 3, the liquid level sensor sends a signal to stop the water injection.

[0047] When the flue gas flows through the auxiliary exchange component 5, it flows through the channel formed by the adjacent main board 51 and the adjacent sub-board 52. The heat in the flue gas is transferred to the exchange pipe 4 through the sub-board 52 and the main board 51, heating the water in the exchange pipe 4. At the same time, the sub-board 52 vibrates and sways under the impact of the flue gas, shaking off the dust adhering to its surface. This vibration is also transmitted to the main board 51. With the assistance of the resonant spring 54, the main board 51 also vibrates continuously, causing the dust adhering to its surface to fall off.

[0048] Water is drawn into the exchange pipe 4 and its temperature rises, causing it to float upwards into the water storage tank 3. The evaporated water vapor flows from the exhaust pipe 71 to the top of the inside of the water storage tank 3 without contacting the water in the tank. It is then discharged from the tank. The low-temperature water in the tank 3 sinks into the exchange pipe 4 and is heated. This cycle continues until the water vapor is evaporated. When the water in the tank 3 is less than one-third of its volume, the level sensor controls the water injection.

[0049] During water filling, water flows upward from the bottom of the exchange pipe 4. At this time, the screen 94 is locked. Some water will pass through the screen 94, but due to the large resistance, the water volume will exert a pushing force on the screen 94, causing the screen 94 and the moving ring 93 to move upward along the exchange pipe 4. During this process, the moving ring 93 rubs against the inner wall of the exchange pipe 4 to remove scale. The striking block 97 continuously moves in and out of the annular groove, and under the elastic force of the elastic rod 96, it continuously strikes the inner wall of the exchange pipe 4, causing the inner wall to vibrate and promoting the removal of scale. At the same time, this vibration will also be transmitted to the main board 51. The removed scale sinks down along the exchange pipe 4, first entering the lower water tank 82, and then settling at the bottom of the sedimentation pipe 87 through the insertion hole 86. When the moving ring 93 rises to contact the upper limit ring 91, the sliding hole 98 is pressed down and fully enters the sliding hole 98. The sliding hole 98 pushes the locking rod 911 and the lower push rod 9 downward. 12. Move the locking rod 911 into the through hole 99, while the lower push rod 912 leaves the through hole 99 and is fully inside the sliding hole 98. This unlocks the rotating shaft 95. Under the impact of the water flow, the screen 94 flips, opening the inner space of the moving ring 93. The water flow can quickly pass through the exchange pipe 4. The rapid water flow supports the moving ring 93, preventing it from sinking. After the water injection stops, the moving ring 93 begins to sink. During this process, the striking block 97 continues to strike the inner wall of the exchange pipe 4, while also acting as a deceleration device, allowing the moving ring 93 to sink slowly and steadily. Without the impact of the water flow, the screen 94 gradually resets and returns to a horizontal state. When the moving ring 93 contacts the lower limit ring 92, the top rod 913 pushes the lower push rod 912 upward, causing the lower push rod 912 to enter the through hole 99 and partially pushing the locking rod 911 out of the through hole 99. The rotating shaft 95 is then locked.

[0050] Example 3, referring to Figure 1 The third embodiment of the present invention provides a boiler flue gas treatment method, comprising the following steps: Flue gas collection: High-temperature flue gas (250℃) is discharged from the boiler exhaust port and allowed to flow along the pipeline.

[0051] Flue gas settling: The flue gas is discharged from the settling tower, allowing it to flow from bottom to top. Some dust particles in the flue gas settle downwards and separate from the flue gas.

[0052] One-stage recovery: When the flue gas temperature is higher than 180℃, the high-temperature flue gas is introduced into the high-heat recovery equipment, so that the high-temperature flue gas and the air in the boiler air supply equipment can exchange heat. The medium-high temperature (150℃) air is sent into the boiler, and the medium-high temperature (150℃) flue gas is introduced into the high-heat recovery equipment.

[0053] Secondary recovery: When the flue gas temperature is below 180℃, the flue gas is introduced into the flue gas recovery box 1, where the flue gas and water exchange heat. The water is heated and evaporated into water vapor, which is then drawn out for use, and the low-temperature flue gas (110℃) is discharged.

[0054] Flue gas emission: Flue gas flows into purification pipe 10, and neutralizing agent is sprayed by sprayer 12. The flue gas is discharged after reacting with the neutralizing agent.

[0055] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A boiler flue gas treatment device for flue gas purification, comprising a flue gas recovery box (1), characterized in that: It also includes a flue gas inlet pipe (2) and a flue gas outlet pipe (21) respectively located at both ends of the flue gas recovery box (1), a purification pipe (10) located at the end of the flue gas recovery box (1) away from the flue gas recovery box (1), a sedimentation pipe (11) and a sprayer (12) located outside the purification pipe (10), a water supply pipe (13) located at the end of the sprayer (12) away from the purification pipe (10), an exchange pipe (4) located inside the flue gas recovery box (1), an auxiliary exchange component (5) located outside the exchange pipe (4), a water storage tank (3) located at the top of the flue gas recovery box (1), a water inlet pipe (6) located at the bottom of the flue gas recovery box (1), and a connecting pipe (7) located between the flue gas recovery box (1) and the water storage tank (3). The purification pipe (10) is L-shaped, the sedimentation pipe (11) is located at the bottom of the bend of the purification pipe (10), the sprayer (12) is located in the vertical part of the purification pipe (10), and the exchange pipe (4) is connected to the inlet pipe (6) and the connecting pipe (7). The auxiliary exchange component (5) specifically includes a main board (51) arranged in a linear array on the outside of the exchange tube (4), a sub-board (52) arranged at the bottom of the main board (51), a mounting groove (53) opened at the bottom of the main board (51), a resonant spring (54) arranged inside the mounting groove (53), and a sealing plate (55) arranged at the opening of the mounting groove (53). The channels between the main boards (51) are parallel to the direction of flue gas flow, the channels between the sub-boards (52) are parallel to the direction of flue gas flow, and the mounting slots (53) are distributed on the edge of the main boards (51).

2. The boiler flue gas treatment device according to claim 1, characterized in that: The upper surface of the motherboard (51) is set as an arched arc surface, and the lower surface is set as a plane.

3. The boiler flue gas treatment device according to claim 1, characterized in that: The exchange tube (4) is provided with a cleaning component (9). The cleaning component (9) specifically includes an upper limit ring (91) set at the upper opening of the exchange tube (4), a lower limit ring (92) set at the lower opening of the exchange tube (4), a moving ring (93) set between the upper limit ring (91) and the lower limit ring (92), a partition (94) set inside the moving ring (93), and a rotating shaft (95) set outside the partition (94). The movable ring (93) is slidably connected inside the exchange tube (4). The outer wall of the movable ring (93) is in contact with the inner wall of the exchange tube (4), and the outer wall of the movable ring (93) is provided with friction texture. The rotating shaft (95) penetrates into the inner wall of the movable ring (93).

4. The boiler flue gas treatment device according to claim 3, characterized in that: The cleaning component (9) also includes an elastic rod (96) disposed above the moving ring (93) and a tapping block (97) disposed on the top of the elastic rod (96). The inner wall of the exchange tube (4) is provided with an annular groove, and the surface of the striking block (97) protrudes outward, with the protruding part stuck in the annular groove.

5. The boiler flue gas treatment device according to claim 4, characterized in that: The cleaning component (9) also includes a sliding hole (98) opened on the top of the moving ring (93), a through hole (99) opened on the outside of the rotating shaft (95), an upper push rod (910) and a lower push rod (912) set inside the sliding hole (98), a locking rod (911) set inside the through hole (99), and a top rod (913) set on the top of the lower limit ring (92). The sliding hole (98) is connected to the through hole (99), the two ends of the locking rod (911) extend to the outer contour surface of the rotating shaft (95), the upper push rod (910) and the lower push rod (912) are distributed at both ends of the locking rod (911), and the top rod (913) penetrates into the sliding hole (98).

6. The boiler flue gas treatment device according to claim 1, characterized in that: The flue gas recovery box (1) is provided with an inner frame (8) that connects the exchange pipe (4), the water inlet pipe (6) and the connecting pipe (7). The inner frame (8) specifically includes an upper water tank (81) located at the top of the inner side of the flue gas recovery box (1), a lower water tank (82) located at the bottom of the inner side of the flue gas recovery box (1), and a support column (83) located between the upper water tank (81) and the lower water tank (82). The upper end of the exchange pipe (4) extends into the upper water tank (81), and the lower end of the exchange pipe (4) extends into the lower water tank (82). The connecting pipe (7) is connected into the upper water tank (81), and the inlet pipe (6) is connected into the lower water tank (82).

7. The boiler flue gas treatment device according to claim 6, characterized in that: The inner frame (8) also includes a bottom frame (84) disposed inside the lower water tank (82), a flow hole (85) and an insertion hole (86) disposed on the surface of the bottom frame (84), and a sedimentation tube (87) disposed inside the insertion hole (86). The bottom frame (84) divides the internal space of the lower water tank (82) into upper and lower parts. The insertion holes (86) are located directly below the exchange pipe (4), and the flow holes (85) are located in the gaps between the insertion holes (86). The sedimentation pipe (87) extends upward to the inner bottom wall of the lower water tank (82).

8. The boiler flue gas treatment device according to claim 6, characterized in that: The exhaust pipe (71) between the upper water tank (81) and the water storage tank (3) extends upward to the bottom of the inner side of the water storage tank (3), and the exhaust pipe (71) extends upward to the top of the inner side of the water storage tank (3).

9. A method for treating boiler flue gas, employing the boiler flue gas treatment device as described in claim 1, characterized in that, Includes the following steps: Flue gas collection: The flue gas is discharged from the boiler exhaust port and allowed to flow along the pipeline; Flue gas settling: The flue gas is directed out of the settling tower, allowing it to flow from bottom to top; One-stage recovery: The flue gas is introduced into a high-heat recovery device to exchange heat with the air in the boiler gas supply equipment; Secondary recovery; then the flue gas is introduced into the flue gas recovery box (1) for heat exchange between the flue gas and water; Flue gas emission: Flue gas flows into the purification pipe (10), the sprayer (12) sprays the neutralizing agent, and the flue gas is discharged after reacting with the neutralizing agent.

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