Biomass pyrolysis gasification gas purification device

Abstract

The invention relates to the technical field of biomass gas purification, in particular to a biomass pyrolysis gasified gas purification device which comprises a connecting pipe, an intermittent gas suction mechanism, a dust removal mechanism, a dust collection mechanism and a connecting mechanism, the top of the connecting pipe communicates with an impurity removal pipe, and the outer wall of the impurity removal pipe communicates with a trapezoidal inclined pipe; the outer wall of the top of the trapezoidal inclined pipe is fixedly connected with three evenly-distributed atomizing nozzles, the outer wall of the cooling water pipe communicates with an annular water pipe, and a water return pipe communicates between the annular water pipe and the cooling water pipe. The closed circular plate, the bent pipe and the plurality of perforated circular plates can slide along the inner wall of the annular water pipe all the time under the action of water flow, so that the negative pressure fan adsorbs flue gas under negative pressure, and the purification speed of the flue gas is increased; when the bent pipe does not push the circumferential shifting plate, the upper edge of the ash removal frame makes contact with the bottom face of the filter screen through the restoring force of the annular spring, large-particle impurities intercepted by the bottom face of the filter screen are scraped down and collected into the ash removal frame, and the two effects of flue gas accelerated purification and automatic dust collection are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of biomass gas purification, and particularly relates to a biomass pyrolysis gasification gas purification device. Background Art

[0002] Biomass refers to various organisms formed through photosynthesis using the atmosphere, water, land, etc. Broadly speaking, biomass includes all plants, microorganisms, and animals that feed on plants and microorganisms and their produced wastes. Narrowly speaking, biomass mainly refers to substances such as straw, trees, lignocellulose, agricultural processing by-products, agricultural and forestry wastes, and livestock manure. In the existing high-temperature dust removal device for biomass wood chip biomass gas, the dust removal effect is poor during use. When biomass fuel is gasified, a large amount of soot and evaporated oil fumes are generated inside it, which will cause a large amount of adhesion inside the exhaust pipe, thereby increasing the resistance when the air flow circulates. After long-term use, the gas flowability of the dust removal pipe decreases, resulting in a reduction in the dust removal effect.

[0003] The patent with the publication number CN117903852B discloses a high-temperature dust removal device for a biomass gasifier, including a gas collecting hood. A cooling pipe is fixedly connected to the upper side of the gas collecting hood. An outer enclosure is fixedly connected to the outer wall of the cooling pipe. The outer enclosure is of a ring structure, and the middle part of the outer enclosure does not contact the outer wall of the cooling pipe. A water inlet pipe is fixedly connected to one side of the outer enclosure. The water inlet pipe communicates the space between the outer enclosure and the cooling pipe with the outside of the outer enclosure. An installation hole is opened in the side wall of the cooling pipe at the middle part of the outer enclosure. A fixing seat is fixedly connected to the inner wall of the installation hole. The present invention is provided with a moving mechanism.

[0004] However, there are still some deficiencies in the actual use of the above: 1. Through the spraying of a layer of atomizing nozzles, part of the flue gas is extremely easy to escape from the gaps and cannot be purified; 2. Only part of the sewage will be sprayed onto the surface of the gathering hood and flow along the surface of the gathering hood into the inside of the cooling hood and be discharged. However, most of the sewage still remains inside the connecting pipe, and the large particle impurities contained in the flue gas are not treated, making it extremely easy to remain inside the connecting pipe. Therefore, a biomass pyrolysis gasification gas purification device is proposed to solve the above-mentioned problems. Summary of the Invention

[0005] The purpose of the present invention is to solve the problems in the background art, and a biomass pyrolysis gasification gas purification device is proposed.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0007] A biomass pyrolysis gasification gas purification device, including a connecting pipe, the top of the connecting pipe is communicated with an impurity removal pipe, the outer wall of the impurity removal pipe is communicated with a trapezoidal inclined pipe, the outer wall of the trapezoidal inclined pipe is communicated with an exhaust pipe, the bottom outer wall of the trapezoidal inclined pipe is communicated with a sewage discharge pipe, and three uniformly distributed atomizing nozzles are fixedly connected to the top outer wall of the trapezoidal inclined pipe. The outer wall of each atomizing nozzle is fixedly connected with a purification branch pipe, and the three purification branch pipes are all fixedly connected to the same trapezoidal inclined pipe. The outer wall of the cooling water pipe is communicated with an annular water pipe, and a return water pipe is communicated between the annular water pipe and the cooling water pipe. It also includes:

[0008] An intermittent air intake mechanism, including an elbow pipe, a closed circular plate and several perforated circular plates. The elbow pipe is arranged inside the annular water pipe, the closed circular plate is fixedly connected to the end of the elbow pipe, and several perforated circular plates are fixedly connected to the outer wall of the elbow pipe;

[0009] A dust removal mechanism, including a rectangular outer slideway, a rectangular inner rack and a dust cleaning frame. The rectangular outer slideway and the rectangular inner rack are fixedly connected to the inner wall of the impurity removal pipe through a bracket, and the dust cleaning frame is arranged inside the impurity removal pipe;

[0010] A dust collection mechanism, including two opening and closing plates, two second gears and two third shaft rods. The two second gears are respectively fixedly connected to the third shaft rods, the two third shaft rods are rotatably connected to the dust cleaning frame, and the two opening and closing plates are respectively fixedly connected to the two third shaft rods;

[0011] And a connecting mechanism slidably connected to the outer wall of the impurity removal pipe.

[0012] Preferably, a communication cavity is communicated with the outer wall of the annular water pipe. A second shaft rod is rotatably connected to the outer wall of the communication cavity, and the second shaft rod is rotatably connected to the impurity removal pipe. A rotating circumferential dial is arranged inside the communication cavity, and the rotating circumferential dial is fixedly connected to the second shaft rod. A one-way rotating bearing is rotatably connected to the end of the second shaft rod, and an installation bracket is rotatably connected to the end of the one-way rotating bearing. The installation bracket is fixedly connected to the impurity removal pipe.

[0013] Preferably, a large gear is fixedly connected to the outer wall of the one-way rotating bearing. A small gear is meshed with the outer wall of the large gear. A first shaft rod is fixedly connected to the outer wall of the small gear, and a negative pressure fan is fixedly connected to the other end of the first shaft rod.

[0014] Preferably, a filter frame is slidably connected to the inner wall of the impurity removal pipe. A filter screen is fixedly connected to the inner wall of the filter frame. A dust collection cavity is slidably connected to the inner wall of the other side of the impurity removal pipe, and the dust collection cavity is arranged below the dust cleaning frame.

[0015] Preferably, the connecting mechanism includes a transmission gear, a first rack, a first connecting rod, and a sealing slide plate. The transmission gear is fixedly connected to the second shaft rod. The outer wall of the transmission gear is fixedly connected to the first rack. The first rack is slidably connected to the outer wall of the impurity removal pipe. The first rack is fixedly connected to the first connecting rod. The first connecting rod is fixedly connected to the sealing slide plate. The sealing slide plate is slidably connected to the impurity removal pipe.

[0016] Preferably, a connecting plate is fixedly connected to the outer wall of the end of the second shaft rod away from the transmission gear. A fixing plate is arranged on one side of the connecting plate. The fixing plate is fixedly connected to the impurity removal pipe. Limiting rings are fixedly connected to the outer walls on both sides of the fixing plate. The limiting rings are slidably connected to the inner wall of the connecting plate. An annular spring is arranged around the outer side of the limiting ring. The annular spring is fixedly connected to the connecting plate and the fixing plate.

[0017] Preferably, a fixing rod is fixedly connected to the inner wall of the sealing slide plate. A sliding rod is slidably connected to the inner wall of the fixing rod. A limiting gear is fixedly connected to the end of the sliding rod. The limiting gear meshes with the inner toothed rack frame. The limiting gear is fixedly connected to a slider through a one-way bearing. The slider is fixedly connected to the dust cleaning frame.

[0018] Preferably, a second rack is slidably connected to the outer wall of the dust cleaning frame. A first gear meshes with the outer wall of the second rack. The first gear is fixedly connected to one of the third shaft rods. A first spring is fixedly connected between the second rack and the dust cleaning frame.

[0019] Compared with the existing technology, the beneficial effects of the present invention are as follows:

[0020] In the present invention, by arranging the cooling water pipe, the annular water pipe, and the return water pipe, the closed circular plate, the elbow pipe, and several perforated circular plates will slide along the inner wall of the annular water pipe all the time. Thus, the large gear drives the small gear to rotate, enabling the negative pressure fan to adsorb the flue gas under negative pressure, accelerating the purification speed of the flue gas. There is no need to set up smoking equipment such as a blower. When the elbow pipe does not push the circumferential dial plate, the restoring force of the annular spring makes the upper edge of the dust cleaning frame contact the bottom surface of the filter screen, scraping off the large particle impurities intercepted on the bottom surface of the filter screen and collecting them into the dust cleaning frame. Subsequently, the impurities inside are collected into the dust collection cavity, achieving the dual effects of accelerating the purification of the flue gas and automatically collecting the dust through the flow of water. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic three-dimensional structure of the present invention Figure 1 ;

[0022] Figure 2 is a schematic three-dimensional structure of the present invention Figure 2 ;

[0023] Figure 3It is a schematic structural diagram inside the annular water pipe of the present invention;

[0024] Figure 4 It is a schematic structural diagram of the present invention after removing the large gear and the small gear;

[0025] Figure 5 It is a schematic structural diagram inside the impurity removal pipe of the present invention;

[0026] Figure 6 It is a schematic structural diagram at the return-shaped outer slideway of the present invention;

[0027] Figure 7 It is the present invention Figure 6 The partial enlarged structural diagram at position A in;

[0028] Figure 8 It is a schematic structural diagram at the bottom of the dust cleaning frame of the present invention;

[0029] Figure 9 It is the present invention Figure 8 The partial enlarged structural diagram at position B in;

[0030] Figure 10 It is the present invention Figure 8 The partial enlarged structural diagram at position C in.

[0031] In the figure: 1, connecting pipe; 2, impurity removal pipe; 3, first spring; 4, annular water pipe; 5, return water pipe; 6, atomizing nozzle; 7, purification branch pipe; 8, cooling water pipe; 9, trapezoidal inclined pipe; 10, exhaust pipe; 11, sewage discharge pipe; 12, communication cavity; 13, mounting bracket; 14, large gear; 15, small gear; 16, sealing slide plate; 17, connecting rod one; 18, dust collection cavity; 19, first rack; 20, transmission gear; 21, one-way rotating bearing; 22, rotating circumferential dial; 23, filter frame; 24, closed circular plate; 25, perforated circular plate; 26, elbow; 27, first gear; 28, fixed rod; 29, first shaft rod; 30, second shaft rod; 31, annular spring; 32, limiting ring; 33, connecting plate; 34, fixing plate; 35, negative pressure fan; 36, filter screen; 37, return-shaped outer slideway; 38, return-shaped inner rack; 39, dust cleaning frame; 40, slide rod; 41, limiting gear; 42, slider; 43, opening and closing plate; 44, second rack; 45, third shaft rod; 46, second gear; 101, intermittent air suction mechanism; 202, dust removal mechanism; 303, dust collection mechanism; 404, connecting mechanism. Detailed implementation manners

[0032] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0033] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0034] Referring to Figure 1 - Figure 10 , a purification device for biomass pyrolysis gasification gas, comprising a connecting pipe 1. The top of the connecting pipe 1 is communicated with a impurity removal pipe 2. The outer wall of the impurity removal pipe 2 is communicated with a trapezoidal inclined pipe 9. The outer wall of the trapezoidal inclined pipe 9 is communicated with an exhaust pipe 10. The bottom outer wall of the trapezoidal inclined pipe 9 is communicated with a sewage discharge pipe 11. Three uniformly distributed atomizing nozzles 6 are fixedly connected to the top outer wall of the trapezoidal inclined pipe 9. The outer wall of each atomizing nozzle 6 is fixedly connected with a purification branch pipe 7. The three purification branch pipes 7 are all fixedly connected to the same trapezoidal inclined pipe 9. The outer wall of a cooling water pipe 8 is communicated with an annular water pipe 4. A return water pipe 5 is communicated between the annular water pipe 4 and the cooling water pipe 8. It further comprises:

[0035] An intermittent air suction mechanism 101, comprising an elbow pipe 26, a closed circular plate 24 and a plurality of perforated circular plates 25. The elbow pipe 26 is arranged inside the annular water pipe 4. The closed circular plate 24 is fixedly connected to the end of the elbow pipe 26. The plurality of perforated circular plates 25 are fixedly connected to the outer wall of the elbow pipe 26;

[0036] A dust removal mechanism 202, comprising a rectangular outer slideway 37, a rectangular inner rack frame 38 and a dust cleaning frame 39. The rectangular outer slideway 37 and the rectangular inner rack frame 38 are fixedly connected to the inner wall of the impurity removal pipe 2 through brackets. The dust cleaning frame 39 is arranged inside the impurity removal pipe 2;

[0037] A dust collection mechanism 303, comprising two opening and closing plates 43, two second gears 46 and two third shaft rods 45. The two second gears 46 are respectively fixedly connected to the third shaft rods 45. The two third shaft rods 45 are rotatably connected to the dust cleaning frame 39. The two opening and closing plates 43 are respectively fixedly connected to the two third shaft rods 45;

[0038] And a connecting mechanism 404 slidably connected to the outer wall of the impurity removal pipe 2.

[0039] In this implementation scheme, the specific working principle and usage method of the present invention are explained in detail as follows: When in use, the connecting pipe 1 is connected to the smoke exhaust part of the biomass gas, condensed water is input from the cooling water pipe 8, and the sewage flue gas enters the trapezoidal inclined pipe 9 through the connecting pipe 1 and the impurity removal pipe 2. Large particulate impurities in the flue gas are intercepted by the filter screen 36. The condensed water flows into the atomizing nozzles 6 from the purification branch pipe 7. The flue gas is purified successively through the three atomizing nozzles 6 to avoid incomplete purification of the flue gas. Finally, the sewage is discharged through the sewage discharge pipe 11, and the gas is discharged through the exhaust pipe 10.

[0040] Among them, a communication cavity 12 is communicated with the outer wall of the annular water pipe 4. The outer wall of the communication cavity 12 is rotatably connected to a second shaft rod 30. The second shaft rod 30 is rotatably connected to the impurity removal pipe 2. A rotating circumferential dial 22 is arranged inside the communication cavity 12. The rotating circumferential dial 22 is fixedly connected to the second shaft rod 30. The end of the second shaft rod 30 is rotatably connected to a one-way rotating bearing 21. The end of the one-way rotating bearing 21 is rotatably connected to a mounting bracket 13. The mounting bracket 13 is fixedly connected to the impurity removal pipe 2.

[0041] Among them, a large gear 14 is fixedly connected to the outer wall of the one-way rotating bearing 21. A small gear 15 is meshed with the outer wall of the large gear 14. A first shaft rod 29 is fixedly connected to the outer wall of the small gear 15. The other end of the first shaft rod 29 is fixedly connected to a negative pressure fan 35.

[0042] In this implementation scheme, during the process that water flows through the cooling water pipe 8 and the annular water pipe 4 and then flows back into the cooling water pipe 8 through the return water pipe 5 to return to the annular water pipe 4, since the outer wall of the closed circular plate 24 is consistent with the inner diameter of the annular water pipe 4, the closed circular plate 24, the elbow pipe 26 and several perforated circular plates 25 will slide along the inner wall of the annular water pipe 4 all the time. At the same time, when the closed circular plate 24 and the perforated circular plates 25 rotate past the rotating circumferential dial 22, they will drive the rotating circumferential dial 22 to rotate one week, so that the rotating circumferential dial 22 drives the second shaft rod 30 to rotate. The second shaft rod 30 drives the large gear 14 to rotate through the one-way rotating bearing 21. The large gear 14 drives the first shaft rod 29 and the negative pressure fan 35 to rotate several circles through the small gear 15, so that the negative pressure fan 35 adsorbs the flue gas under negative pressure and accelerates its discharge below the atomizing nozzles 6, accelerating the purification speed of the flue gas, and there is no need to set up smoking equipment such as a blower.

[0043] Among them, a filter frame 23 is slidably connected to the inner wall of the impurity removal pipe 2. A filter screen 36 is fixedly connected to the inner wall of the filter frame 23. A dust collection cavity 18 is slidably connected to the inner wall of the other side of the impurity removal pipe 2. The dust collection cavity 18 is arranged below the ash cleaning frame 39.

[0044] Among them, the connecting mechanism 404 includes a transmission gear 20, a first rack 19, a first connecting rod 17 and a sealing slide plate 16. The transmission gear 20 is fixedly connected to the second shaft rod 30. The outer wall of the transmission gear 20 is fixedly connected to the first rack 19. The first rack 19 is slidably connected to the outer wall of the impurity removal pipe 2. The first rack 19 is fixedly connected to the first connecting rod 17. The first connecting rod 17 is fixedly connected to the sealing slide plate 16. The sealing slide plate 16 is slidably connected to the impurity removal pipe 2.

[0045] Among them, one end of the second shaft rod 30 far from the transmission gear 20 is fixedly connected with a connecting plate 33 on its outer wall. One side of the connecting plate 33 is provided with a fixing plate 34. The fixing plate 34 is fixedly connected to the impurity removal pipe 2. The outer walls on both sides of the fixing plate 34 are fixed with limiting rings 32. The limiting rings 32 are slidably connected to the inner wall of the connecting plate 33. An annular spring 31 is arranged around the outer side of the limiting ring 32. The annular spring 31 is fixedly connected to the connecting plate 33 and the fixing plate 34.

[0046] Among them, a fixing rod 28 is fixedly connected to the inner wall of the sealing slide plate 16. A sliding rod 40 is slidably connected to the inner wall of the fixing rod 28. A limiting gear 41 is fixedly connected to the end of the sliding rod 40. The limiting gear 41 is engaged with the inner toothed rack frame 38. The limiting gear 41 is fixedly connected with a slider 42 through a one-way bearing. The slider 42 is fixedly connected to the dust cleaning frame 39.

[0047] Among them, a second rack 44 is slidably connected to the outer wall of the dust cleaning frame 39. The outer wall of the second rack 44 is engaged with a first gear 27. The first gear 27 is fixedly connected to one of the third shaft rods 45. A first spring 3 is fixedly connected between the second rack 44 and the dust cleaning frame 39.

[0048] In this implementation scheme, at the same time, the second shaft rod 30 drives the transmission gear 20 to rotate, so that it drives the first rack 19 and the first connecting rod 17 to move, drives the sealing slide plate 16 and the fixing rod 28 to move. Since the limiting gear 41 is connected by a one-way bearing, the limiting gear 41 will move in a circular motion along the outer circular slideway 37 and the inner toothed rack frame 38. At this time, the limiting gear 41 moves along the lower part of the outer circular slideway 37 and the inner toothed rack frame 38, and the upper edge of the dust cleaning frame 39 will not contact the bottom surface of the filter screen 36. When the end of the second rack 44 abuts against the inner wall of the impurity removal pipe 2, the second rack 44 drives the first gear 27 to rotate. The first gear 27 drives the two third shaft rods 45 and the opening and closing plate 43 to open through two meshing second gears 46, and the impurities inside are collected into the dust collection cavity 18.

[0049] Subsequently, when the elbow pipe 26 rotates to the other half of the annular water pipe 4, the second shaft rod 30 is restored by the force of the annular spring 31. At this time, the second shaft rod 30 drives the transmission gear 20 to rotate, so that the limiting gear 41 moves above the circular outer slideway 37 and the circular inner rack 38 at this time. The upper edge of the dust cleaning frame 39 contacts the bottom surface of the filter screen 36, and the large particle impurities intercepted on the bottom surface of the filter screen 36 are scraped off and collected into the dust cleaning frame 39.

[0050] The following makes a detailed explanation of the specific working principle and usage method of the present invention: When in use, the connecting pipe 1 is connected to the smoke exhaust part of the biomass gas. Condensed water is input from the cooling water pipe 8. The sewage flue gas enters the trapezoidal inclined pipe 9 through the connecting pipe 1 and the impurity removal pipe 2. The large particle impurities in the flue gas are intercepted by the filter screen 36. The condensed water flows into the atomizing nozzles 6 from the purification branch pipe 7. The flue gas is purified successively by the three atomizing nozzles 6 to avoid incomplete purification of the flue gas. Finally, the sewage is discharged from the sewage discharge pipe 11, and the gas is discharged from the exhaust pipe 10.

[0051] During the process that the water flow passes through the cooling water pipe 8 and the annular water pipe 4 and then flows back into the cooling water pipe 8 from the return water pipe 5 and returns to the annular water pipe 4, since the outer wall of the closed circular plate 24 is consistent with the inner diameter of the annular water pipe 4, the closed circular plate 24, the elbow pipe 26 and several perforated circular plates 25 will always slide along the inner wall of the annular water pipe 4. At the same time, when the closed circular plate 24 and the perforated circular plates 25 rotate past the rotating circumferential dial 22, they will drive the rotating circumferential dial 22 to rotate one week, so that the rotating circumferential dial 22 drives the second shaft rod 30 to rotate. The second shaft rod 30 drives the large gear 14 to rotate through the one-way rotating bearing 21. The large gear 14 drives the first shaft rod 29 and the negative pressure fan 35 to rotate several circles through the small gear 15, so that the negative pressure fan 35 adsorbs the flue gas under negative pressure and accelerates its discharge below the atomizing nozzles 6, accelerating the purification speed of the flue gas and eliminating the need to set up smoking equipment such as a fan.

[0052] At the same time, the second shaft rod 30 drives the transmission gear 20 to rotate, which drives the first rack 19 and the connecting rod 17 to move, driving the sealing slide plate 16 and the fixed rod 28 to move. Since the limiting gear 41 is connected by a one-way bearing, the limiting gear 41 will make a circular motion along the circular outer slideway 37 and the circular inner rack 38. At this time, the limiting gear 41 moves below the circular outer slideway 37 and the circular inner rack 38, and the upper edge of the dust cleaning frame 39 does not contact the bottom surface of the filter screen 36. When the end of the second rack 44 abuts against the inner wall of the impurity removal pipe 2, the second rack 44 drives the first gear 27 to rotate. The first gear 27 drives the two third shaft rods 45 and the opening and closing plate 43 to open through the two meshing second gears 46, and the impurities inside are collected into the dust collection cavity 18.

[0053] Subsequently, when the elbow pipe 26 rotates to the other half of the annular water pipe 4, the second shaft rod 30 is restored by the force of the annular spring 31. At this time, the second shaft rod 30 drives the transmission gear 20 to rotate, so that the limiting gear 41 moves along the upper part of the circular outer slideway 37 and the circular inner rack 38. The upper edge of the dust cleaning frame 39 contacts the bottom surface of the filter screen 36, and the large particle impurities intercepted on the bottom surface of the filter screen 36 are scraped off and collected into the dust cleaning frame 39.

[0054] Further explanation, the above fixed connection, unless otherwise clearly specified and limited, should be understood in a broad sense. For example, it can be welding, gluing, or integrally formed setting, etc., which are well-known conventional means in the art.

[0055] The above is only the preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A biomass pyrolysis gasification gas purification device, comprising a connecting pipe (1), the top of the connecting pipe (1) is connected to a de-impurity pipe (2), the outer wall of the de-impurity pipe (2) is connected to a trapezoidal inclined pipe (9), the outer wall of the trapezoidal inclined pipe (9) is connected to an exhaust pipe (10), the bottom outer wall of the trapezoidal inclined pipe (9) is connected to a sewage pipe (11), the top outer wall of the trapezoidal inclined pipe (9) is fixedly connected to three evenly distributed atomizing nozzles (6), the outer wall of each atomizing nozzle (6) is fixedly connected to a purification branch pipe (7), the three purification branch pipes (7) are fixedly connected to the same trapezoidal inclined pipe (9), the outer wall of the cooling water pipe (8) is connected to an annular water pipe (4), a return water pipe (5) is connected between the annular water pipe (4) and the cooling water pipe (8), characterized in that: Also includes: The intermittent air suction mechanism (101) comprises a curved pipe (26), a closed circular plate (24) and a plurality of perforated circular plates (25), wherein the curved pipe (26) is arranged inside the annular water pipe (4), the closed circular plate (24) is fixedly connected to the end of the curved pipe (26), and the plurality of perforated circular plates (25) are fixedly connected to the outer wall of the curved pipe (26); The dust removal mechanism (202) comprises a circular outer slideway (37), a circular inner rack (38) and a dust cleaning frame (39); the circular outer slideway (37) and the circular inner rack (38) are fixedly connected to the inner wall of the impurity removal pipe (2) through a bracket; and the dust cleaning frame (39) is arranged inside the impurity removal pipe (2); The dust collecting mechanism (303) comprises two opening and closing plates (43), two second gears (46) and two third shafts (45), the two second gears (46) are respectively fixedly connected to the third shafts (45), the two third shafts (45) are rotatably connected to the dust cleaning frame (39), and the two opening and closing plates (43) are respectively fixedly connected to the two third shafts (45); And a connecting mechanism (404) slidably connected to the outer wall of the impurity removal pipe (2).

2. A biomass pyrolysis gasification gas purification device according to claim 1, characterized in that: The outer wall of the annular water pipe (4) is connected to a connecting cavity (12), the outer wall of the connecting cavity (12) is rotatably connected to a second shaft rod (30), the second shaft rod (30) is rotatably connected to the debris removal pipe (2), a rotating circumferential shifting plate (22) is provided inside the connecting cavity (12), the rotating circumferential shifting plate (22) is fixedly connected to the second shaft rod (30), the end of the second shaft rod (30) is rotatably connected to a one-way rotating bearing (21), the end of the one-way rotating bearing (21) is rotatably connected to a mounting bracket (13), and the mounting bracket (13) is fixedly connected to the debris removal pipe (2).

3. A biomass pyrolysis gasification gas purification device according to claim 2, characterized in that: The outer wall of the one-way rotating bearing (21) is fixedly connected to a large gear (14), the outer wall of the large gear (14) is meshed with a small gear (15), the outer wall of the small gear (15) is fixedly connected to a first shaft (29), and the other end of the first shaft (29) is fixedly connected to a negative pressure fan (35).

4. A biomass pyrolysis gasification gas purification device according to claim 3, characterized in that: The inner wall of the impurity removal pipe (2) is slidably connected to a filter frame (23), the inner wall of the filter frame (23) is fixedly connected to a filter screen (36), and the inner wall on the other side of the impurity removal pipe (2) is slidably connected to a dust collecting chamber (18), and the dust collecting chamber (18) is arranged below the dust cleaning frame (39).

5. The biomass pyrolysis gasification gas purification device according to claim 1, characterized in that: The connecting mechanism (404) comprises a transmission gear (20), a first rack (19), a connecting rod (17) and a sealing slide (16); the transmission gear (20) is fixedly connected to the second shaft (30); the outer wall of the transmission gear (20) is fixedly connected to the first rack (19); the first rack (19) is slidably connected to the outer wall of the impurity removal pipe (2); the first rack (19) is fixedly connected to the connecting rod (17); the connecting rod (17) is fixedly connected to the sealing slide (16); and the sealing slide (16) is slidably connected to the impurity removal pipe (2).

6. The biomass pyrolysis gasification gas purification device according to claim 5, characterized in that: A connecting plate (33) is fixedly connected to the outer wall of one end of the second shaft (30) away from the transmission gear (20), a fixing plate (34) is arranged on one side of the connecting plate (33), the fixing plate (34) is fixedly connected to the impurity removal pipe (2), limiting circular rings (32) are fixed to the outer walls on both sides of the fixing plate (34), the limiting circular rings (32) are slidably connected to the inner wall of the connecting plate (33), an annular spring (31) is arranged around the outer side of the limiting circular ring (32), and the annular spring (31) is fixedly connected to the connecting plate (33) and the fixing plate (34).

7. The biomass pyrolysis gasification gas purification device according to claim 5, characterized in that: The inner wall of the sealing slide plate (16) is fixedly connected to a fixed rod (28), the inner wall of the fixed rod (28) is slidably connected to a sliding rod (40), the end of the sliding rod (40) is fixedly connected to a limit gear (41), the limit gear (41) is meshed with a circular internal rack (38), the limit gear (41) is fixedly connected to a sliding block (42) via a one-way bearing, and the sliding block (42) is fixedly connected to a cleaning frame (39).

8. The biomass pyrolysis gasification gas purification device according to claim 4, characterized in that: The outer wall of the cleaning frame (39) is slidably connected to a second rack (44), the outer wall of the second rack (44) is meshed with a first gear (27), the first gear (27) is fixedly connected to one of the third shafts (45), and a first spring (3) is fixedly connected between the second rack (44) and the cleaning frame (39).

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