CN113499677A

CN113499677A - Device for removing dioxin through catalytic oxidation for waste gas treatment and using method thereof

Info

Publication number: CN113499677A
Application number: CN202110842381.8A
Authority: CN
Inventors: 唐志诚; 吴军伟; 赵海军; 陶懿玲; 朱词兴
Original assignee: Jiangsu Baimaoyuan Environmental Protection Technology Co ltd; Lanzhou Institute of Chemical Physics LICP of CAS
Current assignee: Jiangsu Baimaoyuan Environmental Protection Technology Co ltd; Lanzhou Institute of Chemical Physics LICP of CAS
Priority date: 2021-07-26
Filing date: 2021-07-26
Publication date: 2021-10-15
Anticipated expiration: 2041-07-26
Also published as: CN113499677B

Abstract

The invention discloses a device for removing dioxin through catalytic oxidation for waste gas treatment and a using method thereof, and belongs to the technical field of waste gas treatment. A device for removing dioxin through catalytic oxidation for waste gas treatment comprises a mixing container, wherein an inlet flue and an outlet flue for conveying flue gas are respectively arranged on two sides of the outer wall of the mixing container, the outer wall of the mixing container is further connected with an ozone conveying pipe, regulating valves are fixedly arranged on the outer walls of the inlet flue and the ozone conveying pipe, a gas mixing mechanism is arranged in the mixing container, the bottom of the mixing container is connected with a shell, the shell and the mixing container are mutually communicated, a secondary mixing mechanism matched with the gas mixing mechanism is arranged in the shell, and a catalyst layer is arranged in the outlet flue; according to the invention, the flue gas and the ozone are mixed for many times, so that the ozone can efficiently oxidize the dioxin in the flue gas, the oxidation effect of the ozone is improved, and the condition that the ozone is discharged before reacting with the dioxin is avoided, thereby reducing the comprehensive operation cost of waste gas treatment.

Description

Device for removing dioxin through catalytic oxidation for waste gas treatment and using method thereof

Technical Field

The invention relates to the technical field of waste gas treatment, in particular to a device for removing dioxin through catalytic oxidation for waste gas treatment and a using method thereof.

Background

Dioxin generally refers to a group of polychlorinated substituted planar aromatic compounds with similar structures and physical and chemical properties, belongs to chloro-oxygenated tricyclic aromatic compounds, and has various toxic effects including extremely strong carcinogenicity (rat liver cancer causing dose of 10 pg/g) and extremely low dose of environmental endocrine disrupting effect. Such materials are neither produced artificially nor used in any way, but are by-products of combustion and various industrial processes. At present, wood preservation and prevention of evaporation caused by using chlorophenols for schistosome, emission of incineration industry, use of defoliant, preparation of insecticide, bleaching of paper, emission of automobile exhaust and the like are main sources of dioxin in the environment.

In the prior art, patent application No. CN201922046291.9 discloses a device for removing dioxin through catalytic oxidation, which comprises a reactor, an inlet flue, an outlet flue, an ozone generator, an ozone conveying pipe and an ozone injection device; one end of the inlet flue is connected with an inlet of the reactor, one end of the outlet flue is connected with an outlet of the reactor, a rectifying layer and a catalyst layer are arranged in the reactor, the rectifying layer and the catalyst layer are sequentially arranged along the flow direction of flue gas, the ozone injection device is arranged in the inlet flue, one end of the ozone conveying pipe is connected with the ozone generator, the other end of the ozone conveying pipe penetrates through the inlet flue and is connected with the ozone injection device, the ozone conveying pipe is provided with an adjusting valve, ozone and dioxin in the flue gas are oxidized by adding the ozone into the flue gas, and then the dioxin is removed through the catalyst layer, so that the purification effect is achieved; still have the defect, ozone and dioxin mix the effect poorly in the oxidation process of ozone to dioxin, lead to dioxin oxidation effect low, have some ozone and the condition that dioxin reaction just is discharged, have increased the comprehensive running cost of exhaust-gas treatment.

Disclosure of Invention

The invention aims to solve the problem that the mixing effect of ozone and dioxin in flue gas is poor to cause low oxidation effect of the dioxin in the prior art, and provides a device for removing the dioxin through catalytic oxidation for waste gas treatment and a using method thereof.

In order to achieve the purpose, the invention adopts the following technical scheme:

the utility model provides a device that dioxin was got rid of with catalytic oxidation to exhaust-gas treatment, includes mixing container, mixing container outer wall both sides are provided with the entry flue and the export flue that are used for carrying the flue gas respectively, mixing container's outer wall still is connected with the ozone conveyer pipe, entry flue and ozone conveyer pipe outer wall have set firmly the governing valve, be provided with gas mixing mechanism in the mixing container, mixing container's bottom is connected with the casing, the casing communicates with mixing container each other, be provided with in the casing with gas mixing mechanism matched with secondary mixing mechanism, be provided with the catalyst layer in the export flue, still be connected with the spray pipe of carrying alkali lye in the export flue.

Preferably, gas mixing mechanism includes the dwang, the dwang rotates to be connected in mixing vessel, dwang outer wall connection has evenly distributed's stirring extension board, two be connected with the arc between the stirring extension board, arc outer wall connection has first elastic component, the one end that the arc was kept away from to first elastic component is connected with the fly leaf, fly leaf outer wall connection has the deflector, deflector sliding connection is in the arc.

Preferably, the secondary mixing mechanism includes the lead screw, the lead screw passes through the bearing and rotates to be connected in the casing, lead screw outer wall threaded connection has the movable plate, the side of movable plate and the inner wall phase-match of casing, the top outer wall of movable plate is connected with the riser, it is connected with the swinging arms to rotate through the round pin axle in the riser, the top swing joint of lead screw has the end cap, the end cap outer wall is connected with the pivot, the pivot is rotated and is connected in the swinging arms, the one end that the riser was kept away from to the swinging arms is connected with the puddler.

Preferably, the outer wall of the end cap is connected with a gear plate, the outer wall of the stirring rod is connected with a gear engaged with the gear plate, and the outer wall of the stirring rod is further connected with stirring blades which are uniformly distributed.

Preferably, the diapire both sides of casing all are connected with the otic placode, two it is connected with the axis of rotation to rotate between the otic placode, axis of rotation and dwang outer wall connection have matched with synchronizing wheel, two be connected with the belt between the synchronizing wheel, the axis of rotation outer wall connection has two first bevel gears, the bottom of lead screw is connected with the second bevel gear with two first bevel gear engaged with.

Preferably, both of the first bevel gears are provided as incomplete gears, and when one of the first bevel gears is engaged with the second bevel gear, the other first bevel gear is not engaged with the second bevel gear.

Preferably, the catalyst layer may be provided with a plurality of layers, the catalyst layer may be provided in a honeycomb type, and the catalyst layer may include a frame having a plurality of honeycomb openings and catalyst units mounted to the honeycomb openings.

Preferably, the inlet flue includes first pipeline and second pipeline, first pipeline and second pipeline outer wall have all set firmly the go-between, two swing joint has the bolt between the go-between, movable groove has all been seted up in first pipeline and the second pipeline, two movable inslot wall all is connected with second elastic element, two be connected with the loop forming element between the second elastic element, loop forming element inner wall is connected with the filter screen, the ash falling mouth has been seted up to the loop forming element outer wall, the ash falling mouth outside is provided with the collection dirt shell.

Preferably, the outer wall of the dust collection shell is movably connected with a pull rod, and one end, far away from the dust collection shell, of the pull rod is movably connected with the spray pipe.

The invention also discloses a use method of the device for removing dioxin through catalytic oxidation for waste gas treatment, which comprises the following steps:

s1: when the device is used, the inlet flue receives flue gas and conveys the flue gas into the mixing container, the ozone conveying pipe is externally connected with the ozone generator, so that ozone gas generated by the ozone generator is conveyed into the mixing container through the ozone conveying pipe, the flue gas and ozone collide with the curved surface of the movable plate in the mixing container and are preliminarily mixed, meanwhile, the mixed gas acts on the stirring support plate, so that the stirring support plate drives the rotating rod to rotate in the mixing container, rotate relative to the mixing container and mix in the rotating process;

s2: in order to avoid the phenomenon that ozone and flue gas are not uniformly mixed in a mixing container due to short mixing time of the two gases, so that the flue gas is not sufficiently oxidized by the ozone, the rotating rod synchronously rotates under the action of a synchronizing wheel and a belt while rotating, a first bevel gear is connected to the outer side of the rotating shaft and is set as an incomplete gear, when one first bevel gear is meshed with a second bevel gear, the other first bevel gear is not meshed with the second bevel gear any more, so that the forward and reverse rotation of the second bevel gear is realized, the screw rod is further rotated in a forward and reverse reciprocating manner, and the moving plate is moved up and down on the outer side of the screw rod;

s3: when the movable plate moves downwards, the mixed gas in the mixing container is extracted to enter the shell, when the movable plate moves upwards, the mixed gas in the shell is extruded to enter the mixing container again, when the movable plate moves upwards and downwards, the swinging rod can rotate by taking the rotating shaft as a circle center, the swinging rod further drives the stirring rod to further stir and mix the mixed gas entering the shell, and when the swinging rod drives the stirring rod to move, the moving gear on the outer side of the stirring rod is meshed with the gear plate on the outer side of the end cap, so that the stirring rod drives the stirring blades on the outer side of the stirring rod to axially rotate in the swinging rod, and the ozone efficiently oxidizes flue gas;

s4: the oxidized flue gas enters an outlet flue, a catalyst layer in the outlet flue catalytically oxidizes and removes dioxin in the flue gas, Ca compounds, transition metal oxides and the like in the catalyst are used as active substances for dioxin removal reaction, the dioxin in the flue gas is decomposed into carbon dioxide, water and hydrogen chloride under the action of the catalyst, then the hydrogen chloride and the like are reacted through alkali liquor atomized in a spray pipe, acid gas in the flue gas is removed, and finally the flue gas is discharged from the outlet flue.

Compared with the prior art, the invention provides a device for removing dioxin through catalytic oxidation for waste gas treatment and a using method thereof, and the device has the following beneficial effects:

1. this device that catalytic oxidation got rid of dioxin for exhaust-gas treatment and application method thereof, ozone in flue gas and the ozone conveyer pipe is to stirring extension board effort in through the entry flue, makes gas mixing mechanism work, to two kinds of gas preliminary mixing, further stirs the mixture to two kinds of gases through secondary mixing mechanism afterwards, improves the oxidation effect of ozone to dioxin in the flue gas, avoids appearing ozone and just by the exhaust condition with the dioxin reaction yet to reduce exhaust-gas treatment's comprehensive running cost.

2. The device for removing dioxin through catalytic oxidation for waste gas treatment and the use method thereof, the movable plate moves downwards to extract mixed gas in the mixing container to enter the shell, the movable plate moves upwards to extrude the mixed gas in the shell to enter the mixing container again, the phenomenon that the ozone and the flue gas are not mixed uniformly due to short mixing time of the two gases in the mixing container and the ozone does not oxidize the flue gas fully is avoided, the swinging rod can rotate by taking the rotating shaft as the center of a circle during the process of moving up and down of the movable plate, the swinging rod further drives the stirring rod to further stir and mix the mixed gas entering the shell, and the swinging rod drives the stirring rod to move, and simultaneously, the moving gear outside the stirring rod is meshed with the gear plate outside the end cap, so that the stirring rod drives the stirring blades outside the stirring rod to axially rotate in the swinging rod, thereby leading the ozone to carry out high-efficiency oxidation on the flue gas.

3. This device that dioxin was got rid of with catalytic oxidation to exhaust-gas treatment and application method thereof, the filter screen in the loop forming element can be intercepted the particulate matter in the flue gas, avoid influencing the oxidation effect of ozone to the flue gas, and the flue gas passes the filter screen can be to its effort, make the filter screen drive loop forming element reciprocating motion in the activity inslot, and then make the filter screen shake back and forth, avoid the filter screen mesh to be blockked up, influence the interception effect of filter screen, the filter screen shake in-process can shake off impurity, make it drop inside the collection dirt shell, be convenient for clear up.

4. This device for catalytic oxidation gets rid of dioxin for exhaust-gas treatment and application method thereof, loop forming element round trip movement under the condition of filter screen atress, make the collection dirt shell of loop forming element bottom drive the spray tube reciprocating motion in the export flue through the pull rod, enlarge the spraying scope of alkali lye in the spray tube, and then improve the effective effect of getting rid of acid gas in the alkali lye to the flue gas, guarantee to discharge the cleanness of flue gas.

5. According to the device for removing dioxin through catalytic oxidation for waste gas treatment and the using method thereof, the catalyst layer is arranged in a honeycomb manner, so that the structural strength of the catalyst layer is ensured, and the catalytic efficiency is also ensured.

Drawings

Fig. 1 is a first structural schematic diagram of the present invention.

Fig. 2 is a second structural schematic diagram of the present invention.

Fig. 3 is a schematic sectional view of the mixing vessel of the present invention.

Fig. 4 is a schematic structural diagram of the gas mixing mechanism of the present invention.

Fig. 5 is a schematic structural diagram of the secondary mixing mechanism of the present invention.

Fig. 6 is a schematic structural view of a portion a in fig. 5 according to the present invention.

Fig. 7 is a schematic view of the structure of the first bevel gear and the second bevel gear of the present invention.

FIG. 8 is a schematic cross-sectional view of the inlet and outlet flues of the invention.

Fig. 9 is a schematic structural view of a portion B in fig. 8 according to the present invention.

Fig. 10 is a schematic view of the structure of the catalyst layer of the present invention.

In the figure: 1. a mixing vessel; 2. an inlet flue; 201. a first conduit; 202. a second conduit; 3. an ozone delivery pipe; 4. an outlet flue; 5. adjusting a valve; 6. a housing; 7. a catalyst layer; 701. a frame; 702. a catalyst unit; 8. a spray tube; 9. rotating the rod; 901. a stirring support plate; 902. an arc-shaped plate; 9021. a first elastic element; 903. a movable plate; 9031. a guide plate; 10. a screw rod; 11. moving the plate; 111. a vertical plate; 112. a swing lever; 12. an end cap; 121. a rotating shaft; 122. a gear plate; 13. a stirring rod; 131. a moving gear; 132. a stirring blade; 14. an ear plate; 141. a rotating shaft; 15. a synchronizing wheel; 151. a belt; 16. a first bevel gear; 161. a second bevel gear; 17. a connecting ring; 171. a bolt; 18. a movable groove; 181. a second elastic element; 19. an annular member; 191. filtering with a screen; 20. a dust collecting case; 21. a pull rod.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

Example (b):

referring to fig. 1, fig. 2, fig. 3, fig. 4, fig. 8 and fig. 10, a device for removing dioxin through catalytic oxidation for waste gas treatment, including mixing container 1, mixing container 1 outer wall both sides are provided with entry flue 2 and export flue 4 that are used for carrying the flue gas respectively, mixing container 1's outer wall still is connected with ozone conveyer pipe 3, entry flue 2 and ozone conveyer pipe 3 outer wall have set firmly governing valve 5, be provided with gas mixing mechanism in the mixing container 1, mixing container 1's bottom is connected with casing 6, casing 6 and mixing container 1 communicate each other, be provided with the secondary mixing mechanism with gas mixing mechanism matched with in the casing 6, be provided with catalyst layer 7 in the export flue 4, still be connected with the spray pipe 8 of carrying alkali lye in the export flue 4.

When the device is used, the inlet flue 2 receives flue gas and conveys the flue gas into the mixing container 1, the ozone conveying pipe 3 is externally connected with the ozone generator, so that ozone gas generated by the ozone generator is conveyed into the mixing container 1 through the ozone conveying pipe 3, the flue gas and ozone are preliminarily mixed in the mixing container 1 through the gas mixing mechanism, and then the two gases are mixed again through the secondary mixing mechanism in the shell 6.

As a preferred technical scheme of the invention, the gas mixing mechanism comprises a rotating rod 9, the rotating rod 9 is rotatably connected in the mixing container 1, the outer wall of the rotating rod 9 is connected with uniformly distributed stirring support plates 901, an arc-shaped plate 902 is connected between the two stirring support plates 901, the outer wall of the arc-shaped plate 902 is connected with a first elastic element 9021, one end of the first elastic element 9021, which is far away from the arc-shaped plate 902, is connected with a movable plate 903, the outer wall of the movable plate 903 is connected with a guide plate 9031, and the guide plate 9031 is slidably connected in the arc-shaped plate 902; flue gas in the entry flue 2 and ozone in the ozone conveyer pipe 3 are all discharged into mixing vessel 1, two kinds of gases that get into in the mixing vessel 1 collide with the curved surface of fly leaf 903 and preliminary mixing, to fly leaf 903 effort, first elastic element 9021 contracts, fly leaf 903 rocks back and forth, break up the mist, and mist effort is in stirring extension board 901 simultaneously, make stirring extension board 901 drive dwang 9 at mixing vessel 1 internal rotation, rotate for mixing vessel 1, mix the oxidation at rotatory in-process.

Referring to fig. 1, 3, 5, 6 and 7, as a preferred technical solution of the present invention, the secondary mixing mechanism includes a screw rod 10, the screw rod 10 is rotatably connected in the housing 6 through a bearing, a moving plate 11 is connected to an outer wall of the screw rod 10 in a threaded manner, a side edge of the moving plate 11 is matched with an inner wall of the housing 6, an outer wall of a top of the moving plate 11 is connected with a vertical plate 111, a swing rod 112 is rotatably connected in the vertical plate 111 through a pin shaft, an end cap 12 is movably connected to a top of the screw rod 10, an outer wall of the end cap 12 is connected with a rotating shaft 121, the rotating shaft 121 is rotatably connected in the swing rod 112, and one end of the swing rod 112, which is far away from the vertical plate 111, is connected with a stirring rod 13.

Both sides of the bottom wall of the shell 6 are connected with the ear plates 14, a rotating shaft 141 is rotatably connected between the two ear plates 14, the outer walls of the rotating shaft 141 and the rotating rod 9 are connected with the synchronizing wheels 15 matched with each other, a belt 151 is connected between the two synchronizing wheels 15, the outer wall of the rotating shaft 141 is connected with the two first bevel gears 16, and the bottom of the screw rod 10 is connected with the second bevel gear 161 meshed with the two first bevel gears 16.

Both first bevel gears 16 are provided as incomplete gears, wherein when one first bevel gear 16 meshes with the second bevel gear 161, the other first bevel gear 16 does not mesh with the second bevel gear 161.

In order to avoid the phenomenon that ozone and flue gas are not mixed uniformly in the mixing container 1 due to short mixing time of the two gases, so that the flue gas is not oxidized sufficiently by the ozone, the rotating rod 9 rotates and simultaneously enables the rotating shaft 141 to rotate synchronously under the action of the synchronizing wheel 15 and the belt 151, the outer side of the rotating shaft 141 is connected with the first bevel gears 16 and is set as an incomplete gear, when one of the first bevel gears 16 is meshed with the second bevel gear 161, the other first bevel gear 16 is not meshed with the second bevel gear 161 any more, so that the forward and reverse rotation of the second bevel gear 161 is realized, the screw rod 10 is further rotated in a forward and reverse reciprocating manner, the moving plate 11 moves up and down on the outer side of the screw rod 10, when the moving plate 11 moves down, the mixed gas in the mixing container 1 is pumped into the shell 6, and when the moving plate 11 moves up, the mixed gas in the shell 6 is squeezed to re-enter the mixing container 1, in the process that the moving plate 11 moves up and down, the swing rod 112 can rotate around the rotating shaft 121, and the swing rod 112 drives the stirring rod 13 to further stir and mix the mixed gas entering the inside of the housing 6, so that the ozone can efficiently oxidize the flue gas.

Further, the outer wall of the end cap 12 is connected with a gear plate 122, the outer wall of the stirring rod 13 is connected with a movable gear 131 meshed with the gear plate 122, and the outer wall of the stirring rod 13 is also connected with uniformly distributed stirring blades 132; while the swing rod 112 drives the stirring rod 13 to move, the moving gear 131 on the outer side of the stirring rod 13 is meshed with the gear plate 122 on the outer side of the end cap 12, so that the stirring rod 13 drives the stirring blades 132 on the outer side to axially rotate in the swing rod 112, and the oxidation effect of ozone on flue gas is further enhanced.

Referring to fig. 8 and 9, the inlet flue 2 includes a first pipe 201 and a second pipe 202, the outer walls of the first pipe 201 and the second pipe 202 are both fixedly provided with a connecting ring 17, a bolt 171 is movably connected between the two connecting rings 17, the first pipe 201 and the second pipe 202 are both provided with a movable groove 18, the inner walls of the two movable grooves 18 are both connected with a second elastic element 181, a ring-shaped element 19 is connected between the two second elastic elements 181, the inner wall of the ring-shaped element 19 is connected with a filter screen 191, the outer wall of the ring-shaped element 19 is provided with an ash falling port, and the outer side of the ash falling port is provided with a dust collecting shell 20; filter screen 191 among the loop forming element 19 can intercept the particulate matter in the flue gas, avoid influencing the oxidation effect of ozone to the flue gas, and the flue gas passes filter screen 191 and can be to its effort, make filter screen 191 drive loop forming element 19 reciprocating motion in activity groove 18, and then make filter screen 191 shake back and forth, avoid filter screen 191 mesh to be blockked up, influence filter screen 191's interception effect, filter screen 191 shakes the in-process and can shake off impurity, make it drop inside collection dirt shell 20, be convenient for clear up.

Furthermore, the outer wall of the dust collecting shell 20 is movably connected with a pull rod 21, and one end of the pull rod 21 far away from the dust collecting shell 20 is movably connected with the spray pipe 8; the annular piece 19 moves back and forth under the condition that the filter screen 191 is stressed, so that the dust collecting shell 20 at the bottom of the annular piece 19 drives the spraying pipe 8 to move back and forth in the outlet flue 4 through the pull rod 21, the spraying range of the alkali liquor in the spraying pipe 8 is enlarged, the effective removal effect of the alkali liquor on the acid gas in the flue gas is further improved, and the cleanness of the discharged flue gas is ensured.

Referring to fig. 10, as a preferred embodiment of the present invention, the catalyst layer 7 may be provided with a plurality of layers, the catalyst layer 7 is provided in a honeycomb form, and the catalyst layer 7 includes a frame 701 having a plurality of honeycomb openings and catalyst units 702 installed in the honeycomb openings; not only the structural strength of the catalyst layer 7 is ensured, but also the catalytic efficiency is ensured.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims

1. A device for removing dioxin through catalytic oxidation for waste gas treatment comprises a mixing container (1), it is characterized in that an inlet flue (2) and an outlet flue (4) for conveying flue gas are respectively arranged on two sides of the outer wall of the mixing container (1), the outer wall of the mixing container (1) is also connected with an ozone conveying pipe (3), the outer walls of the inlet flue (2) and the ozone conveying pipe (3) are fixedly provided with regulating valves (5), a gas mixing mechanism is arranged in the mixing container (1), the bottom of the mixing container (1) is connected with a shell (6), the shell (6) is communicated with the mixing container (1), a secondary mixing mechanism matched with the gas mixing mechanism is arranged in the shell (6), a catalyst layer (7) is arranged in the outlet flue (4), and a spray pipe (8) for conveying alkali liquor is also connected in the outlet flue (4).

2. The device for removing dioxin through catalytic oxidation for exhaust gas treatment according to claim 1, wherein the gas mixing mechanism comprises a rotating rod (9), the rotating rod (9) is rotatably connected in the mixing container (1), stirring support plates (901) are uniformly distributed on the outer wall of the rotating rod (9), an arc-shaped plate (902) is connected between the two stirring support plates (901), a first elastic element (9021) is connected to the outer wall of the arc-shaped plate (902), a movable plate (903) is connected to one end, away from the arc-shaped plate (902), of the first elastic element (9021), a guide plate (9031) is connected to the outer wall of the movable plate (903), and the guide plate (9031) is slidably connected in the arc-shaped plate (902).

3. The device for removing dioxin through catalytic oxidation for exhaust gas treatment according to claim 2, wherein the secondary mixing mechanism comprises a lead screw (10), the lead screw (10) is rotatably connected in the housing (6) through a bearing, a movable plate (11) is connected to the outer wall of the lead screw (10) in a threaded manner, the side edge of the movable plate (11) is matched with the inner wall of the housing (6), a vertical plate (111) is connected to the outer wall of the top of the movable plate (11), a swing rod (112) is rotatably connected in the vertical plate (111) through a pin shaft, an end cap (12) is movably connected to the top of the lead screw (10), a rotating shaft (121) is connected to the outer wall of the end cap (12), the rotating shaft (121) is rotatably connected in the swing rod (112), and a stirring rod (13) is connected to one end, far away from the vertical plate (111), of the swing rod (112).

4. The device for removing dioxin through catalytic oxidation for exhaust gas treatment according to claim 3, wherein the gear plate (122) is connected to the outer wall of the end cap (12), the moving gear (131) meshed with the gear plate (122) is connected to the outer wall of the stirring rod (13), and the stirring blades (132) are uniformly distributed and connected to the outer wall of the stirring rod (13).

5. The device for removing dioxin through catalytic oxidation for exhaust gas treatment according to claim 3, wherein the bottom wall of the casing (6) is connected with lug plates (14) on both sides, a rotating shaft (141) is rotatably connected between the two lug plates (14), the rotating shaft (141) and the outer wall of the rotating rod (9) are connected with the corresponding synchronizing wheels (15), a belt (151) is connected between the two synchronizing wheels (15), two first bevel gears (16) are connected to the outer wall of the rotating shaft (141), and the bottom of the screw rod (10) is connected with a second bevel gear (161) meshed with the two first bevel gears (16).

6. An apparatus for removing dioxin through catalytic oxidation for exhaust gas treatment according to claim 5, characterized in that both of the first bevel gears (16) are provided as incomplete gears, and when one of the first bevel gears (16) is engaged with the second bevel gear (161), the other of the first bevel gears (16) is not engaged with the second bevel gear (161).

7. The apparatus for removing dioxin in catalytic oxidation for exhaust gas treatment according to claim 1, characterized in that the catalyst layer (7) is provided with a plurality of layers, the catalyst layer (7) is provided in a honeycomb form, and the catalyst layer (7) includes a frame (701) having a plurality of honeycomb openings and catalyst units (702) installed at the honeycomb openings.

8. The device for removing dioxin through catalytic oxidation for exhaust gas treatment according to claim 1, wherein the inlet flue (2) comprises a first pipeline (201) and a second pipeline (202), connecting rings (17) are fixedly arranged on the outer walls of the first pipeline (201) and the second pipeline (202), a bolt (171) is movably connected between the two connecting rings (17), movable grooves (18) are formed in the first pipeline (201) and the second pipeline (202), second elastic elements (181) are connected to the inner walls of the two movable grooves (18), a ring-shaped member (19) is connected between the two second elastic elements (181), a filter screen (191) is connected to the inner wall of the ring-shaped member (19), an ash falling port is formed in the outer wall of the ring-shaped member (19), and a dust collection shell (20) is arranged outside the ash falling port.

9. The device for removing dioxin through catalytic oxidation for exhaust gas treatment according to claim 8, characterized in that a pull rod (21) is movably connected to the outer wall of the dust collection housing (20), and one end of the pull rod (21) far away from the dust collection housing (20) is movably connected to the spray pipe (8).

10. A method for using the apparatus for removing dioxin through catalytic oxidation for exhaust gas treatment according to any of claims 1 to 9, characterized by comprising the steps of:

s1: when the device is used, the inlet flue (2) receives flue gas and conveys the flue gas into the mixing container (1), the ozone conveying pipe (3) is externally connected with the ozone generator, so that ozone gas generated by the ozone generator is conveyed into the mixing container (1) through the ozone conveying pipe (3), the flue gas and ozone collide with the curved surface of the movable plate (903) in the mixing container (1) and are preliminarily mixed, meanwhile, the mixed gas acts on the stirring support plate (901), so that the stirring support plate (901) drives the rotating rod (9) to rotate in the mixing container (1) and rotate relative to the mixing container (1), and mixing is carried out in the rotating process;

s2: in order to avoid the phenomenon that ozone and flue gas are not uniformly mixed due to short mixing time of the two gases in the mixing container (1), and the ozone does not sufficiently oxidize the flue gas, the rotating rod (9) rotates and enables the rotating shaft (141) to synchronously rotate under the action of the synchronizing wheel (15) and the belt (151), the outer side of the rotating shaft (141) is connected with the first bevel gears (16) and is set as an incomplete gear, when one of the first bevel gears (16) is meshed with the second bevel gear (161), the other first bevel gear (16) is not meshed with the second bevel gear (161) any more, so that the forward and reverse rotation of the second bevel gear (161) is realized, the screw rod (10) is further enabled to rotate in a forward and reverse reciprocating manner, and the moving plate (11) moves up and down on the outer side of the screw rod (10);

s3: when the moving plate (11) moves downwards, the mixed gas in the mixing container (1) is extracted to enter the shell (6), when the moving plate (11) moves upwards, the mixed gas in the shell (6) is extruded to reenter the mixing container (1), and when the moving plate (11) moves upwards and downwards, the swinging rod (112) can rotate by taking the rotating shaft (121) as the center of a circle, further leading the swinging rod (112) to drive the stirring rod (13) to further stir and mix the mixed gas entering the shell (6), when the swing rod (112) drives the stirring rod (13) to move, the gear plate (122) on the outer side of the end cap (12) is meshed with the gear (131) on the outer side of the stirring rod (13), so that the stirring rod (13) drives the stirring blades (132) on the outer side to axially rotate in the swing rod (112), and ozone is used for efficiently oxidizing the flue gas;

s4: the oxidized flue gas enters an outlet flue (4), a catalyst layer (7) in the outlet flue (4) catalyzes and oxidizes and removes dioxin in the flue gas, Ca compounds, transition metal oxides and the like in the catalyst are used as active substances for dioxin removal reaction, the dioxin in the flue gas is decomposed into carbon dioxide, water and hydrogen chloride under the action of the catalyst, then the hydrogen chloride and the like are reacted through alkali liquor atomized in an atomizing pipe (8), acid gas in the flue gas is removed, and finally the flue gas is discharged from the outlet flue (4).