Waste heat recovery-based flue gas purification device for waste incineration

Abstract

The invention relates to the technical field of flue gas purification, in particular to a waste incineration flue gas purification device based on waste heat recovery, which comprises a purification box, a filter cartridge rotatably mounted in the purification box, a flue gas suction pipe fixedly connected to the purification box, and a flue gas inlet pipe penetrating into the filter cartridge, a self-discharging type cleaning assembly for cleaning the inner wall of the filter cartridge and an air heating assembly matched with the smoke inlet pipe to blow-dry the filter cartridge are arranged in the purification box, and an impurity scraping assembly for cleaning the inner wall of the smoke inlet pipe is arranged on the smoke inlet pipe; according to the invention, the filter cartridge is rotationally matched with reverse pre-flushing and secondary scrubbing and pushes impurities to be discharged, so that efficient self-cleaning of the filter cartridge is realized, flue gas waste heat is utilized to heat air to form hot air flow, residual water in filter holes is dried, flue gas is guided to a purified water spraying area to be purified, and the flue gas discharging and purifying effects are improved; in addition, the rotating roller is linked with the semi-annular elastic cutter to reciprocate to scrape impurities on the inner wall of the smoke inlet pipe, and the heat conduction efficiency of the spiral heating cavity area is prevented from being affected by impurity attachment.

Description

Technical Field

[0001] This invention relates to the field of flue gas purification technology, and in particular to a flue gas purification device for waste incineration based on waste heat recovery. Background Technology

[0002] Waste composition is complex and uneven. The incineration process involves various chemical reactions, producing flue gas containing not only excess air and carbon dioxide, but also pollutants that pose direct or indirect harm to human health and the environment. These pollutants can be clearly classified into four main categories based on their properties: particulate matter, acidic gases, heavy metals, and organic pollutants. The degree of harm they cause to the environment varies depending on their quantity and properties. Therefore, waste incineration flue gas is the most significant source of pollution in this treatment process.

[0003] For example, the flue gas emission filtration and purification component for waste incineration disclosed in CN114146498A, although the purification device uses the impact force of the flue gas discharge to drive the filter mechanism to swing back and forth to achieve impurity filtration and preliminary anti-clogging, does not fully consider the complex composition of waste incineration flue gas. In actual flue gas, in addition to harmful gases and particulate impurities, there is also oil mist. The oil mist will cause particulate impurities to adhere firmly to the filter screen. The vibration generated by the impact swing alone is not enough to effectively remove the blockage, which can easily cause blockage of the flue gas flow channel. As a result, the device cannot operate stably for a long time and needs to be stopped frequently for cleaning, which affects the processing efficiency and continuity.

[0004] To address the aforementioned technical deficiencies, a solution is proposed that achieves efficient self-cleaning of the filter cartridge through rotation in conjunction with reverse pre-rinsing, secondary brushing, and the removal of impurities. Furthermore, the residual heat of the flue gas is used to heat the air, creating a hot airflow that dries residual water in the filter pores and guides the flue gas to the purified water spray area for purification, thus improving both exhaust and purification efficiency. In addition, the rotating roller, in conjunction with a semi-circular elastic blade, reciprocates to scrape away impurities from the inner wall of the inlet pipe, preventing impurities from affecting the heat conduction efficiency of the spiral heating chamber area and maintaining high exhaust efficiency. Summary of the Invention

[0005] The purpose of this invention is to provide a waste incineration flue gas purification device based on waste heat recovery to solve the aforementioned technical defects.

[0006] The objective of this invention can be achieved through the following technical solution: a waste incineration flue gas purification device based on waste heat recovery, comprising a purification box and a filter cylinder rotatably installed inside the purification box. A smoke extraction pipe is fixedly connected to the purification box, and a smoke inlet pipe extends into the filter cylinder. An inlet pipe and an L-shaped outlet pipe are fixedly connected to the purification box, and the end of the inlet pipe is connected to an inlet cover that slides against the annular outer wall of the filter cylinder. The purification box is equipped with a self-draining cleaning component for cleaning the inner wall of the filter cylinder, and a fan-heating component that works with the smoke inlet pipe to dry the filter cylinder. A scraping component for cleaning the inner wall of the filter cylinder is provided on the smoke inlet pipe.

[0007] The filter cartridge has a frustum-shaped structure, and a rotating disk is fixedly connected to one end of the filter cartridge. A geared motor that drives the rotating disk to rotate is installed on the purification box by bolts. The self-draining cleaning assembly includes a rotating rod that is rotatably connected to the inner wall of the purification box, and a spiral cleaning brush with a frustum-shaped structure is fixedly installed on the rotating rod, and the spiral cleaning brush abuts against the inner wall of the filter cartridge.

[0008] An arc-shaped baffle is fixedly connected to the inner wall of the purification box, which slides against the inner wall of the filter cylinder and the rotating disk. A discharge port is opened on one side of the purification box and below the rotating rod. A collection box communicating with the discharge port is detachably installed on the outer wall of the purification box.

[0009] A gear is fixedly mounted on the rotating rod, and a gear ring that meshes with the gear is fixedly connected to the rotating disk.

[0010] The air-heating assembly includes a spiral heating chamber formed in the side wall of the smoke inlet pipe. An air inlet pipe and an air suction pipe are fixedly connected to the outer wall of the smoke inlet pipe, and the air inlet pipe and the air suction pipe are respectively connected to the two ends of the spiral heating chamber. An air intake hood that slides against the annular outer wall of the filter cartridge is fixedly installed inside the purification box. The free end of the air suction pipe is fixedly connected to the air intake hood.

[0011] The purification box is fixedly connected to an exhaust fan that communicates with the suction pipe. The free end of the air inlet pipe extends to the outside of the purification box and is equipped with a dust filter cover. One end of the smoke inlet pipe is fixedly connected to a diamond-shaped baffle.

[0012] The scraping assembly includes a rotating roller fixedly connected to a rotating disk, and support rods are symmetrically fixedly connected to both sides of the end face of the smoke inlet pipe. A damping slider is slidably connected to the support rod, and an L-shaped rod is fixedly connected to the damping slider. A semi-annular elastic blade is provided on the L-shaped rod.

[0013] The short section of the L-shaped rod is rotatably connected to a deflection block that is fixedly connected to a semi-annular elastic blade. The deflection block has a straight groove. The long section of the L-shaped rod is slidably connected to a movable rod. The movable rod is fixedly connected to a toggle pin that is slidably connected to the straight groove.

[0014] The rotating roller has a wavy cam groove on its annular outer wall. A rotating pin that matches the cam groove is rotatably connected to the movable rod. Connecting ropes are fixedly connected between the two ends of the semi-annular elastic knife and the end of the L-shaped rod.

[0015] The beneficial effects of this invention are as follows: (1) The present invention uses the rotation of the filter cylinder to remove the intercepted impurities from the flue gas discharge path. First, the purified water sprayed by the liquid inlet hood pre-washes the filter holes in the reverse direction. Then, the linkage rotating rod carries the spiral cleaning brush to rotate quickly. With the help of the purified water at the bottom of the purification box, the inner wall of the filter cylinder is brushed twice. The cleaned impurities are pushed to the discharge port by the spiral cleaning brush and the arc baffle, thereby achieving efficient and comprehensive cleaning of the filter cylinder. When the high temperature flue gas flows through the smoke inlet pipe, the residual heat it carries is transferred to the spiral heating chamber through the pipe wall to heat the air flowing in the chamber. The hot air is blown to the cleaned filter cylinder through the air inlet hood to quickly remove the residual purified water in the filter holes and avoid the reduction of smoke discharge efficiency caused by the residual purified water clogging the filter holes. In addition, the directional airflow formed by hot air propels the flue gas toward the large-scale purified water spray area of ​​the liquid inlet hood, so that the flue gas first passes through the purified water spray to remove some particulate impurities and oil mist, and then passes through the filter cartridge for secondary filtration to intercept residual pollutants. Through the synergistic cooperation of reverse pre-rinsing, secondary impurity removal brushing, hot air drying and flue gas guidance, the flue gas purification effect is improved while efficiently exhausting the flue gas.

[0016] (2) In this invention, the rotating disk carries the rotating roller to rotate, and the two sets of movable rods move back and forth along the axis of the smoke inlet pipe. Combined with the sliding resistance between the damping slider and the support rod, a linkage action of first deflection and then movement is formed: When the movable rod is inserted into the smoke inlet pipe, the movable rod first causes the semi-circular elastic blade to deform and separate from the inner wall of the smoke inlet pipe and maintain the deformed state, so as to avoid pushing impurities into the pipe and accumulating. Conversely, when the movable rod is removed from the smoke inlet pipe, the deformed semi-circular elastic blade recovers and closely fits the inner wall of the smoke inlet pipe. With the sliding of the movable rod, the oil mist and impurities on the inner wall are scraped off, so as to avoid the impurities from affecting the heat conduction efficiency of the spiral heating chamber area. This allows the residual heat of the flue gas to be efficiently transferred to the airflow in the spiral heating chamber, providing a stable hot airflow for the drying of the filter cartridge and the propulsion of the flue gas, thereby maintaining the high efficiency of the exhaust. Attached Figure Description

[0017] The invention will now be further described with reference to the accompanying drawings; Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the purification box of the present invention; Figure 3 This is a schematic diagram showing the cooperation between the air inlet hood, the liquid inlet hood, and the filter cartridge of the present invention; Figure 4 This is a schematic diagram of the structure of the air-heating component of the present invention; Figure 5 This is a schematic diagram of the structure of the smoke inlet pipe of the present invention; Figure 6 This is a schematic diagram of the cooperation between the spiral cleaning brush and the arc-shaped baffle of the present invention; Figure 7 This is a schematic diagram of the structure of the liquid inlet hood of the present invention; Figure 8 This is a schematic diagram of the structure of the scraping component of the present invention; Figure 9 This is a schematic diagram showing the disassembled L-shaped rod, movable rod, and deflection block of the present invention.

[0018] Legend: 1. Purification box; 11. Filter cartridge; 12. Smoke extraction pipe; 13. Smoke inlet pipe; 14. Liquid inlet pipe; 15. L-shaped liquid outlet pipe; 16. Liquid inlet hood; 17. Rotary disc; 18. Diamond-shaped baffle; 2. Self-draining cleaning assembly; 21. Rotating rod; 22. Spiral cleaning brush; 23. Arc-shaped baffle; 24. Waste discharge port; 25. Gear; 26. Gear ring; 3. Fan heating assembly; 31. Spiral heating chamber; 32. Air inlet duct; 33. Suction duct; 34. Air inlet hood; 4. Scraping assembly; 41. Rotating roller; 42. Support rod; 43. Damping slider; 44. L-shaped rod; 45. Semi-annular elastic knife; 46. Deflection block; 47. Movable rod; 48. Cam groove; 49. Rotating pin; 410. Connecting rope. Detailed Implementation

[0019] 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 of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0020] Example 1: Please refer to Figures 1-7 As shown, the problem of filter clogging caused by the inability to effectively clean oil mist in flue gas in existing technologies can be solved by the following solutions; In this embodiment, a waste incineration flue gas purification device based on waste heat recovery includes a purification box 1 and a filter cylinder 11 rotatably installed inside the purification box 1. A smoke extraction pipe 12 is fixedly connected to the purification box 1, and a smoke inlet pipe 13 penetrates into the filter cylinder 11. The oily high-temperature flue gas generated by waste incineration is injected into the purification box 1 through the smoke inlet pipe 13 and then discharged through the smoke extraction pipe 12. During the flue gas discharge process, particulate impurities and oil mist are filtered and intercepted by the filter cylinder 11, and the impurities intercepted on the filter cylinder 11 are removed from the flue gas discharge path by the slow rotation of the filter cylinder 11, thereby achieving continuous and unblocked high-efficiency filtration and smoke discharge. The purification chamber 1 is fixedly connected to an inlet pipe 14 and an L-shaped outlet pipe 15. The end of the inlet pipe 14 is connected to an inlet cover 16 that slides against the annular outer wall of the filter cylinder 11. Multiple outlet holes are opened through the side of the inlet cover 16 that is in contact with the filter cylinder 11. Purified water is injected into the inlet cover 16 through the inlet pipe 14 and then sprayed into the filter cylinder 11 through the multiple outlet holes on the inlet cover 16. The large-scale purified water sprayed out by the inlet cover 16 purifies the flue gas. Some particulate impurities and oil mist in the flue gas are removed from the flue gas by the spraying of purified water. In addition, when the impurities intercepted on the filter cartridge 11 rotate to the area of ​​the liquid inlet hood 16, the impurities in the filter holes are pre-washed by the sprayed purified water, so as to achieve efficient cleaning of the impurities in the filter holes. The vertical section of the L-shaped liquid outlet pipe 15 is located at the bottom of the purification box 1, and the end of the vertical section is not blocked, while the horizontal section extends to the outside of the purification box 1. The purified water sprayed from the liquid inlet hood 16 continuously accumulates in the purification tank 1. The purified water in the purification tank 1 will submerge the bottom of the filter cylinder 11. At the same time, the purified water will enter the L-shaped liquid outlet pipe 15. When the height of the purified water is higher than the inner wall of the horizontal section of the L-shaped liquid outlet pipe 15, it will be discharged through the L-shaped liquid outlet pipe 15. The purification tank 1 is equipped with a self-draining cleaning component 2 for cleaning the inner wall of the filter cylinder 11, and a fan heating component 3 that works with the smoke inlet pipe 13 to dry the filter cylinder 11. The smoke inlet pipe 13 is equipped with a scraping component 4 for cleaning its inner wall.

[0021] The filter cartridge 11 has a frustum-shaped structure, and a rotating disk 17 is fixedly connected to one end of the filter cartridge 11. A geared motor that drives the rotating disk 17 to rotate is installed on the purification box 1 by bolts. The geared motor drives the filter cartridge 11 to rotate through the rotating disk 17. The self-draining cleaning component 2 includes a rotating rod 21 that is rotatably connected to the inner wall of the purification box 1. A spiral cleaning brush 22 with a frustum-shaped structure is fixedly installed on the rotating rod 21. The spiral cleaning brush 22 abuts against the inner wall of the filter cartridge 11. When the spiral cleaning brush 22 rotates, the purified water at the bottom of the purification box 1 submerges the bottom of the filter cartridge 11, and performs a secondary scrubbing of the impurities and oil on the inner wall of the filter cartridge 11, thereby improving the cleaning effect of the filter cartridge 11.

[0022] An arc-shaped baffle 23 is fixedly connected to the inner wall of the purification box 1, which slides against the inner wall of the filter cylinder 11 and the rotating disk 17. A discharge port 24 is provided on one side of the purification box 1 and below the rotating rod 21. The discharge port 24 is set by the frustum structure of the filter cylinder 11 and the spiral cleaning brush 22. When the bottom of the filter cylinder 11 is submerged by purified water, the purified water will not be discharged through the discharge port 24. The rotating spiral cleaning brush 22, combined with the arc-shaped baffle 23, can push the cleaned impurities to the discharge port 24 and push them out. A collection box (not shown) that communicates with the discharge port 24 is detachably installed on the outer wall of the purification box 1. This is used to collect the discharged impurities while preventing the flue gas in the purification box 1 from being discharged through the discharge port 24.

[0023] A gear 25 is fixedly installed on the rotating rod 21, and a gear ring 26 that meshes with the gear 25 is fixedly connected to the rotating disk 17. The rotating disk 17 carries the gear ring 26 to rotate. Combined with the meshing of the gear ring 26 and the gear 25 and the ratio of their teeth, the rotating rod 21 is driven to rotate rapidly, which in turn drives the spiral cleaning brush 22 to rotate.

[0024] The air heating component 3 includes a spiral heating chamber 31 opened in the side wall of the flue pipe 13. When the high-temperature flue gas is discharged into the purification box 1 through the liquid inlet pipe 14, the heat it carries heats the liquid inlet pipe 14, thereby heating the air flowing in the spiral heating chamber 31. An air inlet pipe 32 and an air suction pipe 33 are fixedly connected to the outer wall of the flue pipe 13, and the air inlet pipe 32 and the air suction pipe 33 are respectively connected to the two ends of the spiral heating chamber 31. An air inlet cover 34 is fixedly installed in the purification box 1 and slides against the annular outer wall of the filter cartridge 11. Multiple air outlets are opened through one side of the air intake hood 34 that fits against the filter cartridge 11. The free end of the suction pipe 33 is fixedly connected to the air intake hood 34. Hot air is injected into the air intake hood 34 and then blown into the filter cartridge 11 through multiple air outlets on the air intake hood 34 in a multi-point fit to dry the filter cartridge 11 and remove residual purified water in the filter holes. This prevents residual purified water from clogging the filter holes and reducing the smoke exhaust efficiency. In addition, the injected air blows the flue gas entering the filter cartridge 11 toward the liquid inlet hood 16, and the large-area purified water sprayed out by the liquid inlet hood 16 sprays the flue gas for spray purification treatment.

[0025] An exhaust fan connected to the suction pipe 33 is fixedly connected to the purification box 1. The exhaust fan draws in outside air through the suction pipe 33, the spiral heating chamber 31 and the air inlet pipe 32. The free end of the air inlet pipe 32 extends to the outside of the purification box 1 and is equipped with a dust filter cover to prevent dust and impurities from entering the air inlet pipe 32. A diamond-shaped baffle 18 is fixedly connected to one end of the smoke inlet pipe 13 to prevent the high-temperature flue gas in the smoke inlet pipe 13 from being discharged quickly and to improve the heating effect on the air.

[0026] Example 2: Please refer to Figure 3 , Figure 4 , Figure 8 and Figure 9 As shown, the following solutions can be used to address the problem that impurities adhering to the inner wall of the flue gas pipe prevent the waste heat from efficiently heating the airflow after long-term use, thus reducing the removal effect of residual purified water. In this embodiment, the scraping component 4 includes a rotating roller 41 fixedly connected to the rotating disk 17, and support rods 42 symmetrically fixedly connected to both sides of the end face of the smoke inlet pipe 13. A damping slider 43 is slidably connected to the support rod 42, and an L-shaped rod 44 is fixedly connected to the damping slider 43. A semi-annular elastic blade 45 is provided on the L-shaped rod 44. When the movable rod 47 is pulled out from the flue pipe 13, it drives the semi-annular elastic blade 45 to slide against the inner wall of the flue pipe 13, scraping off the oil mist and impurities adhering to the inner wall of the liquid inlet pipe 14. This ensures efficient heat conduction treatment of the high-temperature flue gas in the spiral heating chamber 31 area of ​​the flue pipe 13. Furthermore, the alternating reverse movement of the two sets of movable rods 47 carrying the corresponding semi-annular elastic blades 45 avoids the problem of intermittent rapid flue gas discharge when the two sets of movable rods 47 move out at the same time, thus maintaining the uniformity of the flue gas discharge rate.

[0027] The short section of the L-shaped rod 44 is rotatably connected to a deflection block 46 that is fixedly connected to a semi-annular elastic knife 45. A straight groove is provided on the deflection block 46. The long section of the L-shaped rod 44 is slidably connected to a movable rod 47. A toggle pin that is slidably connected to the straight groove is fixedly connected to the movable rod 47. When the movable rod 47 is inserted into the smoke inlet pipe 13, the sliding resistance between the damping slider 43 and the support rod 42 causes the movable rod 47 to slide inside the L-shaped rod 44 before moving with the L-shaped rod 44. Through the sliding connection between the actuating pin and the straight groove, the deflection block 46 is pushed to deflect the semi-annular elastic knife 45, causing the semi-annular elastic knife 45 located at the deflection block 46 to separate from the inner wall of the smoke inlet pipe 13. The deformation force of the semi-annular elastic blade 45 exceeds the sliding resistance of the damping slider 43, causing the movable rod 47 to carry the L-shaped rod 44 and the deformed semi-annular elastic blade 45 into the smoke inlet pipe 13. This prevents the adhering oil mist and impurities from being pushed into the liquid inlet pipe 14. When the movable rod 47 is pulled out of the smoke inlet pipe 13, it uses the sliding resistance of the damping slider 43 and the deflection block 46 to adhere to the L-shaped rod 44 through the actuating pin on the movable rod 47 and the straight groove. This causes the deformed semi-annular elastic blade 45 to recover and adhere to the inner wall of the smoke inlet pipe 13. The semi-annular elastic blade 45 slides against the inner wall of the smoke inlet pipe 13, scraping off the oil mist and impurities adhering to the inner wall of the liquid inlet pipe 14.

[0028] The annular outer wall of the rotating roller 41 is provided with a wave-shaped cam groove 48. The movable rod 47 is rotatably connected with a rotating pin 49 that matches the cam groove 48. The rotating disk 17 carries the rotating roller 41 to rotate, and through the wave-shaped cam groove 48 on its surface and the rotating pin 49 inserted into the cam groove 48, it pushes the two sets of movable rods 47 to move back and forth in opposite directions. The two ends of the semi-annular elastic knife 45 are fixedly connected to the ends of the L-shaped rod 44 by connecting ropes 410. When the movable rod 47 is inserted into the smoke inlet pipe 13, it pushes the deflection block 46 to deflect the semi-annular elastic knife 45. The semi-annular elastic knife 45 located at the deflection block 46 separates from the inner wall of the smoke inlet pipe 13. Through the deflection of the semi-annular elastic knife 45 carried by the deflection block 46, combined with the connecting rope 410 connecting the ends of the semi-annular elastic knife 45 and the L-shaped rod 44, the two ends are relatively deformed and attached to the inner wall of the smoke inlet pipe 13, further preventing the adhering oil mist and impurities from being pushed into the liquid inlet pipe 14 and accumulating.

[0029] Example 3: Please refer to Figures 1-9 As shown, the present invention also proposes a method for using a waste incineration flue gas purification device based on waste heat recovery, comprising the following steps: Step 1: The exhaust fan draws in outside air through the suction pipe 33, the spiral heating chamber 31 and the air inlet pipe 32, and injects it into the air inlet hood 34. Then, it blows the air into the filter cartridge 11 through multiple air outlets on the air inlet hood 34. The purified water is injected into the liquid inlet hood 16 through the liquid inlet pipe 14. Then, it is sprayed into the filter cartridge 11 through multiple liquid outlets on the liquid inlet hood 16 and falls to the bottom of the purification box 1 to continuously accumulate. The amount of purified water entering the L-shaped liquid inlet pipe 14 increases simultaneously until the height of the purified water is higher than the height of the L-shaped liquid outlet pipe 15 and is discharged. Step 2: The oily, high-temperature flue gas generated by waste incineration is injected into the purification box 1 through the flue gas inlet pipe 13. The injected air blows the flue gas inside the filter cartridge 11 toward the liquid inlet hood 16. The flue gas is purified by the large-scale purification water sprayed by the liquid inlet hood 16. Some particulate impurities and oil mist in the flue gas are removed from the flue gas by the spray of purification water. The remaining particulate impurities and oil mist are filtered and intercepted by the filter cartridge 11 for a second time. Combined with the geared motor driving the rotating disk 17 to slowly rotate the filter cartridge 11, the impurities intercepted on the filter cartridge 11 are removed from the flue gas discharge path, thus achieving continuous and unblocked high-efficiency filtration and exhaust. Step 3: The rotating disk 17 drives the gear ring 26 to rotate. Combined with the meshing of the gear ring 26 and the gear 25 and the ratio of their teeth, the rotating rod 21 rotates rapidly, which in turn drives the spiral cleaning brush 22 to rotate. With the purified water at the bottom of the purification box 1 submerging the bottom of the filter cylinder 11, the impurities and oil on the inner wall of the filter cylinder 11 are brushed and washed. Then, the spiral cleaning brush 22, combined with the arc-shaped baffle 23, pushes the washed impurities to the discharge port 24 and collects them through the collection box. Step 4: When the impurities intercepted on the filter cartridge 11 rotate to the area of ​​the liquid inlet hood 16, the impurities in the filter holes are pre-washed in reverse by the sprayed purified water. Combined with the secondary brushing, the filter cartridge 11 is fully cleaned. At the same time, the high-temperature flue gas is discharged into the purification box 1 through the liquid inlet pipe 14, and the heat it carries heats the liquid inlet pipe 14, which in turn heats the air flowing in the spiral heating chamber 31. The hot air is blown onto the filter cartridge 11 through the air inlet hood 34 to dry it, remove the residual purified water in the filter holes, and avoid the residual purified water from clogging the filter holes and reducing the flue gas exhaust efficiency. Step 5: The rotating disk 17 carries the rotating roller 41 to rotate, and through the wavy cam groove 48 on its surface and the rotating pin 49 inserted into the cam groove 48, it pushes the two sets of movable rods 47 to move in opposite directions. When the movable rod 47 is inserted into the smoke inlet pipe 13, the sliding resistance between the damping slider 43 and the support rod 42 causes the movable rod 47 to slide inside the L-shaped rod 44 before moving. Through the sliding connection between the actuating pin and the straight groove, the deflecting block 46 carries the semi-annular elastic knife 45 to deflect. At this time, the semi-annular elastic knife 45 is in a deformed state. The semi-annular elastic knife 45 is separated from the inner wall of the smoke inlet pipe 13 at the deflection block 46. The deflection block 46 carries the deflection of the semi-annular elastic knife 45. Combined with the connecting rope 410 connecting the end of the semi-annular elastic knife 45 and the L-shaped rod 44, the two ends are deformed and fitted together until the deformation force of the semi-annular elastic knife 45 is greater than the sliding resistance of the damping slider 43. This causes the movable rod 47 to carry the L-shaped rod 44 and the deformed semi-annular elastic knife 45 into the smoke inlet pipe 13, thus preventing the adhering oil mist and impurities from being pushed into the liquid inlet pipe 14 and accumulating. Step Six: When the movable rod 47 is pulled out of the flue pipe 13, it uses the sliding resistance of the damping slider 43 and the deflection block 46 to fit against the L-shaped rod 44 through the actuating pin on the movable rod 47 and the straight groove. This causes the deformed semi-annular elastic knife 45 to return to its original state and fit against the inner wall of the flue pipe 13. That is, the semi-annular elastic knife 45 is in its normal state. This causes the semi-annular elastic knife 45 to slide against the inner wall of the flue pipe 13, scraping off the oil mist and impurities adhering to the inner wall of the liquid inlet pipe 14, ensuring efficient heat conduction treatment of the area of ​​the spiral heating chamber 31 on the flue pipe 13 by the high-temperature flue gas.

[0030] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A flue gas purification device for waste incineration based on waste heat recovery, comprising a purification tank (1), and a filter cylinder (11) rotatably installed inside the purification tank (1), characterized in that, The purification box (1) is fixedly connected to a smoke extraction pipe (12) and a smoke inlet pipe (13) that penetrates into the filter cylinder (11). The purification box (1) is fixedly connected to a liquid inlet pipe (14) and an L-shaped liquid outlet pipe (15). The end of the liquid inlet pipe (14) is connected to a liquid inlet cover (16) that slides against the annular outer wall of the filter cylinder (11). The purification box (1) is equipped with a self-draining cleaning assembly (2) for cleaning the inner wall of the filter cylinder (11) and a wind-heating assembly (3) that works with the smoke inlet pipe (13) to dry the filter cylinder (11). The smoke inlet pipe (13) is equipped with a scraping assembly (4) for cleaning its inner wall.

2. The waste incineration flue gas purification device based on waste heat recovery according to claim 1, characterized in that, The filter cylinder (11) has a frustum structure, and a rotating disk (17) is fixedly connected to one end face of the filter cylinder (11). A geared motor that drives the rotating disk (17) to rotate is installed on the purification box (1) by bolts. The self-draining cleaning assembly (2) includes a rotating rod (21) rotatably connected to the inner wall of the purification box (1), and a spiral cleaning brush (22) with a frustum structure is fixedly installed on the rotating rod (21), and the spiral cleaning brush (22) abuts against the inner wall of the filter cylinder (11).

3. The waste incineration flue gas purification device based on waste heat recovery according to claim 2, characterized in that, An arc-shaped baffle (23) is fixedly connected to the inner wall of the purification box (1) and slides against the inner wall of the filter cylinder (11) and the rotating disk (17). A discharge port (24) is opened on one side of the purification box (1) and below the rotating rod (21). A collection box communicating with the discharge port (24) is detachably installed on the outer wall of the purification box (1).

4. The waste incineration flue gas purification device based on waste heat recovery according to claim 2, characterized in that, A gear (25) is fixedly installed on the rotating rod (21), and a gear ring (26) that meshes with the gear (25) is fixedly connected to the rotating disk (17).

5. The waste incineration flue gas purification device based on waste heat recovery according to claim 1, characterized in that, The air heating assembly (3) includes a spiral heating chamber (31) opened in the side wall of the smoke inlet pipe (13). An air inlet pipe (32) and an air suction pipe (33) are fixedly connected to the outer wall of the smoke inlet pipe (13), and the air inlet pipe (32) and the air suction pipe (33) are respectively connected to the two ends of the spiral heating chamber (31). An air intake hood (34) that slides against the annular outer wall of the filter cylinder (11) is fixedly installed in the purification box (1). The free end of the air suction pipe (33) is fixedly connected to the air intake hood (34).

6. The waste incineration flue gas purification device based on waste heat recovery according to claim 5, characterized in that, The purification box (1) is fixedly connected to an exhaust fan that communicates with the suction pipe (33). The free end of the air inlet pipe (32) extends to the outside of the purification box (1) and is equipped with a dust filter cover. One end of the smoke inlet pipe (13) is fixedly connected to a diamond-shaped baffle (18).

7. The waste incineration flue gas purification device based on waste heat recovery according to claim 2, characterized in that, The scraping assembly (4) includes a rotating roller (41) fixedly connected to the rotating disk (17), and support rods (42) symmetrically fixedly connected to both sides of the end face of the smoke inlet pipe (13). A damping slider (43) is slidably connected to the support rod (42), and an L-shaped rod (44) is fixedly connected to the damping slider (43). A semi-annular elastic blade (45) is provided on the L-shaped rod (44).

8. The waste incineration flue gas purification device based on waste heat recovery according to claim 7, characterized in that, The short section of the L-shaped rod (44) is rotatably connected to a deflection block (46) that is fixedly connected to a semi-annular elastic blade (45). The deflection block (46) has a straight groove. The long section of the L-shaped rod (44) is slidably connected to a movable rod (47). The movable rod (47) is fixedly connected to a toggle pin that is slidably connected to the straight groove.

9. The waste incineration flue gas purification device based on waste heat recovery according to claim 8, characterized in that, The rotating roller (41) has a wave-shaped cam groove (48) on its annular outer wall. The movable rod (47) is rotatably connected to a rotating pin (49) that matches the cam groove (48). The two ends of the semi-annular elastic knife (45) are fixedly connected to the ends of the L-shaped rod (44) with connecting ropes (410).

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