Dioxin degradation device

Abstract

The utility model discloses a dioxin degradation device which comprises a horizontal cylinder body (1), a smoke inlet (2) is formed at one end of the cylinder body (1), a smoke outlet (3) is formed at the other end of the cylinder body (1), a plurality of air inlets (4) obliquely facing the smoke outlet (3) are formed in the outer wall of the cylinder body (1), a sleeve (5) is arranged on the outer side of the cylinder body (1), and a plurality of ultraviolet lamp tubes (6) distributed in the circumferential direction are arranged between the sleeve (5) and the cylinder body (1). Titanium dioxide layers are arranged on the inner wall of the sleeve (5) and the outer wall of the barrel (1); an air inducing opening (7) is formed in the peripheral face of the sleeve (5), an air generating mechanism is arranged between the sleeve (5) and the barrel (1), and the air generating mechanism enables annular flowing air flow to be generated between the barrel (1) and the sleeve (5). The utility model has the advantage of low maintenance frequency.

Description

Technical Field

[0001] This utility model belongs to the field of waste incinerator flue gas treatment equipment, and in particular relates to a dioxin degradation device. Background Technology

[0002] The flue gas from waste incinerators contains dioxins, which need to be treated by degradation devices before being emitted. Existing degradation devices, such as the dioxin degradation and removal device in application number 201020681215.1, include a cylinder with a titanium dioxide layer on the inner wall as a catalyst. An ultraviolet lamp is installed inside the cylinder. Its working principle is that flue gas passes through the cylinder, and the ultraviolet lamp irradiates the titanium dioxide layer, exciting high-energy reactive oxygen species, hydroxyl radicals, superoxide radicals, and other substances. For ease of description, these substances are collectively referred to as free radicals. The free radicals degrade dioxins into smaller molecules, including water and carbon dioxide.

[0003] Existing degradation devices degrade dioxins through photocatalysis, which has the advantages of low equipment cost, low operating cost, and high degradation efficiency. However, there are also some drawbacks. This is mainly because the flue gas composition is complex, containing oily particles and dust, which easily adhere to the titanium dioxide layer and ultraviolet lamps, hindering light transmission and potentially causing titanium dioxide "poisoning." This leads to a gradual decrease in the number of free radicals excited by the irradiation of the titanium dioxide layer, resulting in a gradual decrease in the degradation efficiency of dioxins. Therefore, it is necessary to clean the titanium dioxide layer and ultraviolet lamps regularly. However, the internal structure of the cylinder is relatively complex, making cleaning difficult. At the same time, cleaning requires shutting down the incinerator, which affects factory production. Utility Model Content

[0004] The purpose of this invention is to provide a dioxin degradation device. This invention has the advantage of low maintenance frequency.

[0005] The technical solution of this utility model is as follows: a dioxin degradation device, comprising a horizontal cylindrical body, one end of which forms a smoke inlet and the other end of which forms a smoke outlet. The outer wall of the cylindrical body is provided with multiple air inlets inclined towards the smoke outlet. A sleeve is provided on the outer side of the cylindrical body, and multiple circumferentially distributed ultraviolet lamps are provided between the sleeve and the cylindrical body. The inner wall of the sleeve and the outer wall of the cylindrical body are both provided with a titanium dioxide layer.

[0006] In the aforementioned dioxin degradation device, an air inlet is provided on the outer circumferential surface of the sleeve, and an air-generating mechanism is provided between the sleeve and the cylinder, which generates an annular airflow between the cylinder and the sleeve.

[0007] In the aforementioned dioxin degradation device, the air-generating mechanism includes a drive mechanism, an outer impeller located between the ultraviolet lamp tube and the sleeve, and an inner impeller located between the ultraviolet lamp tube and the cylinder. Both the outer and inner impellers are connected to the drive mechanism. Both the outer and inner impellers include two annular rings, and multiple fan blades are provided between the two annular rings. The length of the fan blades is parallel to that of the cylinder.

[0008] In the aforementioned dioxin degradation device, in the rotation direction of the outer impeller, the outer end of the impeller blade is located in front of the inner end of the impeller blade, so that the airflow generated by the impeller blade has a driving force that moves radially inward.

[0009] In the aforementioned dioxin degradation device, two rolling support units are provided between the cylinder and the sleeve, and the two rolling support units are respectively located at both ends of the sleeve;

[0010] The rolling support unit includes an outer ring fixed inside the sleeve, an inner ring fixed outside the cylinder, and a middle ring located between the outer ring and the inner ring. Multiple circumferentially distributed rollers are provided between the outer ring and the middle ring, and between the middle ring and the inner ring. A rotating shaft is provided on the roller axially.

[0011] The inner end of the rotating shaft located between the outer ring and the middle ring is fixed to the outer impeller, and the inner end of the rotating shaft located between the middle ring and the inner ring is fixed to the inner impeller.

[0012] The drive mechanism includes a motor and an external gear ring. The motor is fixed on the outer wall of the cylinder. The output end of the motor is provided with a first gear that connects to the external gear ring. The external gear ring is located outside one of the rolling support units and is rotatably connected to the corresponding inner ring. The outer impeller and the inner impeller are both fixed to the external gear ring through corresponding rotating shafts.

[0013] In the aforementioned dioxin degradation device, the driving mechanism further includes an outer ring located outside another rolling support unit, an inner ring on the inner side of the outer ring, the outer ring being fixed to the outer impeller via a corresponding rotating shaft, and the inner ring being fixed to the inner impeller via a corresponding rotating shaft.

[0014] In the aforementioned dioxin degradation device, a slowing device for connecting the cylinder is provided on the middle ring located between the outer ring and the inner ring. The slowing device is used to reduce the rotation speed of the middle ring.

[0015] In the aforementioned dioxin degradation device, the slowing device includes a crown gear fixed to the central ring, a generator motor fixed to the cylinder on one side of the crown gear, a second gear meshing with the crown gear at the input end of the generator motor, and a power-consuming element at the output end of the generator motor.

[0016] In the aforementioned dioxin degradation device, each end of the ultraviolet lamp is provided with a lamp holder fixed to the corresponding middle ring. Two first elastic contacts are provided on the outer end face of the middle ring located at the smoke inlet end, and these two first elastic contacts are respectively connected to the two input ends of the ultraviolet lamp. A first conductive ring and a second conductive ring are provided on the inner end face of the middle ring, and the first and second conductive rings are respectively connected to the two first elastic contacts. A third conductive ring and a fourth conductive ring are provided on the outer end face of the middle ring, with the third conductive ring electrically connected to the first conductive ring, and the fourth conductive ring electrically connected to the second conductive ring. A support is provided on the cylinder, and two second elastic contacts are provided on the support, with the third and fourth conductive rings respectively connected to the two second elastic contacts.

[0017] Compared with existing technologies, this invention places the titanium dioxide layer and ultraviolet lamp on the outside of the cylinder. Free radicals are generated outside the cylinder and then enter the cylinder to degrade dioxins in the flue gas. Since the flue gas does not come into contact with the titanium dioxide layer and ultraviolet lamp, the titanium dioxide layer and ultraviolet lamp remain clean for a long time, requiring no cleaning and requiring low maintenance, thus ensuring smooth factory production. Therefore, this invention has the advantage of low maintenance frequency.

[0018] Furthermore, through further structural improvements, free radicals can be more easily desorbed from the titanium dioxide layer, increasing the concentration of free radicals entering the cylinder and thus improving the degradation efficiency of dioxins. Attached Figure Description

[0019] Figure 1 This is a front view schematic diagram of an embodiment.

[0020] Figure 2 yes Figure 1 Enlarged view at point A.

[0021] Figure 3 yes Figure 1 Enlarged view at point B.

[0022] Figure 4 This is a cross-sectional schematic diagram of an embodiment.

[0023] The labels in the attached diagram are as follows: 1-Cylinder, 2-Smoke inlet, 3-Smoke outlet, 4-Air inlet, 5-Sleeve, 6-Ultraviolet lamp, 7-Air outlet, 8-Inner impeller, 9-Outer impeller, 10-Annular ring, 11-Wind blade, 12-Rolling support unit, 13-Outer ring, 14-Inner ring, 15-Middle ring, 16-Roller, 17-Shaft, 18-Motor, 19-Outer gear ring, 20-First gear, 21-Outer ring, 22-Inner ring, 23-Crown gear, 24-Generator motor, 25-Second gear, 26-First elastic contact, 27-First conductive ring, 28-Second conductive ring, 29-Third conductive ring, 30-Fourth conductive ring, 31-Bracket, 32-Second elastic contact, 33-Lamp holder, 34-Cavity. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0025] Example. A dioxin degradation device, such as... Figure 1 As shown, it includes a horizontal cylindrical body 1, with a smoke inlet 2 at one end and a smoke outlet 3 at the other end. Multiple air inlets 4 inclined towards the smoke outlet 3 are provided on the outer wall of the cylindrical body 1. A sleeve 5 is provided on the outer side of the cylindrical body 1. The sleeve 5 can be fixed to the cylindrical body 1 by a connecting rod. An air duct 7 is provided on the outer circumferential surface of the sleeve 5. Multiple circumferentially distributed ultraviolet lamps 6 are provided between the sleeve 5 and the cylindrical body 1. A titanium dioxide layer is provided on the inner wall of the sleeve 5 and the outer wall of the cylindrical body 1.

[0026] An air-generating mechanism is provided between the sleeve 5 and the cylinder 1. This mechanism generates an airflow between the cylinder 1 and the sleeve 5, primarily annular and secondarily radially inward. The air-generating mechanism includes a drive mechanism, an outer impeller 9 located between the ultraviolet lamp 6 and the sleeve 5, and an inner impeller 8 located between the ultraviolet lamp 6 and the cylinder 1. Both the outer and inner impellers 9 and 8 are connected to the drive mechanism. Each impeller includes two annular rings 10, located at opposite ends of the axial direction of the sleeve 5. Multiple fan blades 11 are positioned between the two annular rings 10, with their longitudinal direction parallel to the cylinder 1. In the direction of impeller rotation, the outer end of each fan blade 11 is positioned in front of its inner end, giving the airflow generated by the fan blades a radially inward driving force. By changing the tilt angle of the fan blades 11, the radially inward flow speed of the airflow can be altered.

[0027] Two rolling support units 12 are provided between the cylinder 1 and the sleeve 5, and the two rolling support units 12 are respectively located at both ends of the sleeve 5. The rolling support unit 12 includes an outer ring 13 fixed to the inner side of the sleeve 5, an inner ring 14 fixed to the outer side of the cylinder 1, and a middle ring 15 located between the outer ring 13 and the inner ring 14. Multiple circumferentially distributed rollers 16 are provided between the outer ring 13 and the middle ring 15, and between the middle ring 15 and the inner ring 14. The rollers 16 are cylindrical, and a rotating shaft 17 is provided axially on the rollers 16, allowing the rollers 16 to rotate on the rotating shaft 17. The outer ends of the outer ring 13 and the inner ring 14 are provided with annular bosses that restrict the axial outward movement of the corresponding rollers 16, and the inner end of the middle ring 15 is provided with annular stops that restrict the axial inward movement of the rollers 16.

[0028] The inner end of the rotating shaft 17 located between the outer ring 13 and the middle ring 15 is fixed to the outer impeller 9, and the inner end of the rotating shaft 17 located between the middle ring 15 and the inner ring 14 is fixed to the inner impeller 8.

[0029] The drive mechanism includes a motor 18 and an outer gear ring 19 made of insulating material. The motor 18 is fixed to the outer wall of the cylinder 1 by a frame. The output end of the motor 18 is provided with a first gear 20 connected to the outer gear ring 19. The outer gear ring 19 is located on the axial outside of one of the rolling support units 12 and is rotatably connected to the corresponding inner ring 14. The outer impeller 9 and the inner impeller 8 are both fixed to the outer gear ring 19 through the corresponding rotating shaft 17.

[0030] The drive mechanism also includes an outer ring 21 located outside another rolling support unit 12. An inner ring 22 is provided inside the outer ring 21. The outer ring 21 is fixed to the outer impeller 9 via a corresponding rotating shaft 17, and the inner ring 22 is fixed to the inner impeller 8 via a corresponding rotating shaft 17. The outer ring 21 and inner ring 22 serve to increase structural strength, ensuring that the various ultraviolet lamps 6 are arranged in parallel, resulting in uniform illumination.

[0031] A slowing device is provided on the middle ring 15 located between the outer ring 21 and the inner ring 22, which is connected to the cylinder 1. The slowing device is used to reduce the rotational speed of the middle ring 15. The slowing device includes a crown gear 23 fixed to the middle ring 15, with the teeth of the crown gear 23 facing outward. A generator motor 24 fixed to the cylinder 1 is provided on one side of the crown gear 23. The input end of the generator motor 24 is provided with a second gear 25 that meshes with the crown gear 23. The output end of the generator motor 24 is provided with a power-consuming element, which can be a heating wire, a high-power lamp, a fan, etc.

[0032] Both ends of the ultraviolet lamp tube 6 are provided with lamp holders 33 fixed to the corresponding middle ring 15. The two middle rings 15 form an integral structure through the ultraviolet lamp tube 6. The outer end face of the middle ring 15 located at the smoke inlet 2 is provided with two first elastic contacts 26, which are respectively connected to the two electrical input terminals of the ultraviolet lamp tube 6. The inner end face of the middle ring 15 is provided with a first conductive ring 27 and a second conductive ring 28, which are respectively connected to the two first elastic contacts 26. The outer end face of the middle ring 15 is provided with a third conductive ring 29 and a fourth conductive ring 30, which are electrically connected to the first conductive ring 27 and the second conductive ring 30 and the second conductive ring 28. The cylinder 1 is provided with a bracket 31, which is provided with two second elastic contacts 32, which are respectively connected to the two second elastic contacts 32.

[0033] Working principle: such as Figure 1 As shown, a relatively closed cavity 34 is formed between the cylinder 1 and the sleeve 5. The flue gas flows from the inlet 2 to the outlet 3. Since the inlet 4 faces the outlet 3, the flue gas flow generates negative pressure, causing the air in the cavity 34 to enter the cylinder 1.

[0034] Two second elastic contacts 32 are connected to the power circuit. The ultraviolet lamp 6 is powered on and emits light, which irradiates the titanium dioxide layer, causing free radicals to be generated in the cavity 34. These free radicals are then carried into the cylinder 1 by the airflow, causing the dioxins in the flue gas to degrade.

[0035] Motor 18 rotates external gear ring 19 via first gear 20. External gear ring 19, through left-side rotating shaft 17, causes inner impeller 8 and outer impeller 9 to rotate synchronously, generating annular airflow within cavity 34. Through multiple experiments by the applicant, it was found that free radicals generated by ultraviolet lamp 6 irradiating the titanium dioxide layer mainly accumulate on the surface of the titanium dioxide layer. Although they can enter the air, the rate is very slow. Therefore, annular airflow is used to accelerate the desorption of free radicals, increase the concentration of free radicals within cavity 34, and improve the degradation efficiency of dioxins. Simultaneously, the annular airflow desorbs free radicals by repeatedly impacting the titanium dioxide layer with the same source of air, without introducing large amounts of outside air, which helps increase the concentration of free radicals within the cylinder 1, thereby improving the degradation efficiency of dioxins.

[0036] The speed of flue gas flow fluctuates. When the flue gas flow rate is slow, the negative pressure generated is low, which may not be enough to allow the air in cavity 34 to enter cylinder 1. In fact, the flue gas in cylinder 1 may enter cavity 34. Therefore, in the direction of impeller rotation, the outer end of the impeller blade 11 is set to be in front of the inner end of the impeller blade 11. When the impeller blade rotates, it gives the air in cavity 34 a compressive force to move inward, ensuring that the air pressure in cavity 34 is greater than the air pressure in cylinder 1. This ensures that free radicals can smoothly enter cylinder 1 to maintain the normal degradation of dioxins, while preventing the flue gas in cylinder 1 from entering cavity 34. This effectively prevents oily particles and dust from adhering to the titanium dioxide layer and ultraviolet lamp tube 6. Long-term use does not require cleaning, and the maintenance frequency is low.

[0037] The cylinder 1 and sleeve 5 are stationary, which makes the outer ring 13 and inner ring 14 also stationary. When the outer gear ring 19 rotates, the roller 16 rotates, giving the middle ring 15 a certain frictional force, which drives the middle ring 15 to rotate. The ultraviolet lamp tube 6 rotates accordingly, making the light distribution in the cavity more uniform. At the same time, it avoids overheating in some areas due to being too close to the ultraviolet lamp tube 6. Free radicals can be generated efficiently in all parts of the titanium dioxide layer, which provides a guarantee for the efficient decomposition of dioxins.

[0038] Because high-speed rotation of the left middle ring 15 would accelerate contact wear, a crown gear 23 is installed on the right middle ring 15. When the left middle ring 15 rotates, it drives the right middle ring 15 to rotate via the ultraviolet lamp 6. The right middle ring 15, through the crown gear 23, drives the second gear 25 to rotate, causing the generator motor 24 to generate electricity. The electrical energy is then consumed by the power-consuming components. Because the generator motor 24 generates current and consumes energy, the rotational speed of the left middle ring 15 decreases. This is a dynamic process: the higher the rotational speed of the left middle ring 15, the greater the resistance provided by the generator motor 24; the lower the rotational speed of the left middle ring 15, the less resistance provided by the generator motor 24. This ensures that the ultraviolet lamp 6 can rotate smoothly while avoiding accelerated contact wear caused by excessive rotational speed, thus reducing maintenance frequency.

[0039] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

Claims

1. A dioxin-degrading device, characterized by comprising: The application relates to a horizontal cylinder (1), one end of the cylinder (1) forms a smoke inlet (2), the other end of the cylinder (1) forms a smoke outlet (3), a plurality of air inlets (4) are arranged on the outer wall of the cylinder (1) and are inclined towards the smoke outlet (3), a sleeve (5) is arranged outside the cylinder (1), a plurality of ultraviolet lamp tubes (6) are arranged between the sleeve (5) and the cylinder (1), and a titanium dioxide layer is arranged on the inner wall of the sleeve (5) and the outer wall of the cylinder (1).

2. The dioxin-degrading device according to claim 1, characterized by: An air inlet (7) is arranged on the outer circumferential surface of the sleeve (5), an air generating mechanism is arranged between the sleeve (5) and the cylinder (1), and the air generating mechanism generates annular flowing air between the cylinder (1) and the sleeve (5).

3. The dioxin-degrading apparatus according to claim 2, characterized by: The air generating mechanism comprises a driving mechanism, an outer wind wheel (9) arranged between the ultraviolet lamp tubes (6) and the sleeve (5) and an inner wind wheel (8) arranged between the ultraviolet lamp tubes (6) and the cylinder (1), the outer wind wheel (9) and the inner wind wheel (8) are connected with the driving mechanism, the outer wind wheel (9) and the inner wind wheel (8) each comprise two annular rings (10), a plurality of fan blades (11) are arranged between the two annular rings (10), and the fan blades (11) are parallel to the cylinder (1) in the length direction.

4. The dioxin-degrading apparatus according to claim 3, characterized by: In the rotating direction of the outer wind wheel (9), the outer side end of the fan blade (11) is located in front of the inner side end of the fan blade (11), so that the air generated by the fan blade (11) has a driving force of moving radially inward.

5. The dioxin-degrading apparatus according to claim 3 or 4, characterized by: Two rolling support units (12) are arranged between the cylinder (1) and the sleeve (5), and the two rolling support units (12) are respectively arranged at the two ends of the sleeve (5); The rolling support unit (12) comprises an outer ring (13) fixed to the inner side of the sleeve (5), an inner ring (14) fixed to the outer side of the cylinder (1) and a middle ring (15) arranged between the outer ring (13) and the inner ring (14), a plurality of rollers (16) are arranged between the outer ring (13) and the middle ring (15) and between the middle ring (15) and the inner ring (14) in the circumferential direction, and the rollers (16) are provided with rotating shafts (17) in the axial direction; The inner side end of the rotating shaft (17) arranged between the outer ring (13) and the middle ring (15) is fixed to the outer wind wheel (9), and the inner side end of the rotating shaft (17) arranged between the middle ring (15) and the inner ring (14) is fixed to the inner wind wheel (8); The driving mechanism comprises a motor (18) and an outer gear ring (19), the motor (18) is fixed to the outer wall of the cylinder (1), the output end of the motor (18) is provided with a first gear (20) connected with the outer gear ring (19), the outer gear ring (19) is located outside one of the rolling support units (12) and is rotationally connected with the corresponding inner ring (14), and the outer wind wheel (9) and the inner wind wheel (8) are fixed to the outer gear ring (19) through the corresponding rotating shafts (17).

6. The dioxin-degrading device according to claim 5, characterized by: The driving mechanism further comprises an outer ring (21) located outside the other rolling support unit (12), the inner side of the outer ring (21) is provided with an inner ring (22), the outer ring (21) is fixed to the outer wind wheel (9) through the corresponding rotating shaft (17), and the inner ring (22) is fixed to the inner wind wheel (8) through the corresponding rotating shaft (17).

7. The dioxin-degrading device according to claim 6, characterized by: The middle ring (15) between the outer ring (21) and the inner ring (22) is provided with a speed reduction device connected to the barrel (1), which is used to reduce the rotating speed of the middle ring (15).

8. The dioxin-degrading device according to claim 7, characterized by: The speed reduction device comprises a crown gear (23) fixed to the middle ring (15), one side of the crown gear (23) is provided with a power generation motor (24) fixed to the barrel (1), the input end of the power generation motor (24) is provided with a second gear (25) engaged with the crown gear (23), and the output end of the power generation motor (24) is provided with an electric consumption element.

9. The dioxin-degrading device according to claim 5, characterized by: Both ends of the ultraviolet lamp tube (6) are provided with lamp holders (33) fixed to the corresponding middle ring (15), the outer side end face of the middle ring (15) at one end of the smoke inlet (2) is provided with two first elastic contacts (26), the two first elastic contacts (26) are respectively connected to the two input ends of the ultraviolet lamp tube (6); the inner side end face of the middle ring (15) is provided with a first conductive ring (27) and a second conductive ring (28), the first conductive ring (27) and the second conductive ring (28) are respectively connected to the two first elastic contacts (26); the outer side end face of the middle ring (15) is provided with a third conductive ring (29) and a fourth conductive ring (30), the third conductive ring (29) and the first conductive ring (27) are electrically connected, and the fourth conductive ring (30) and the second conductive ring (28) are electrically connected; the barrel (1) is provided with a support (31), the support (31) is provided with two second elastic contacts (32), and the third conductive ring (29) and the fourth conductive ring (30) are respectively connected to the two second elastic contacts (32).

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