Collecting tower for high-purity phosphorus

Abstract

The utility model relates to the technical field of chemical equipment, and discloses a high-purity phosphorus collecting tower which comprises a collecting tank, a spraying assembly and a tower body extending in the height direction, the spraying assembly comprises a nozzle and a connecting water pipe used for being connected with a water tank, and the nozzle is connected into the tower body. The tower main body is provided with a lower port and at least two reaction gas inlets used for being connected with reaction pipes in a sealed mode, the adjacent reaction gas inlets are arranged at intervals in the height direction, the lower port and the reaction gas inlets are located below the nozzles respectively, and the lower port extends into the collecting tank; the lower end of the collecting tank is provided with a finished product outlet for outflow of finished products and a finished product valve, the finished product valve is connected to the finished product outlet, the upper end of the collecting tank is provided with a circulating liquid outlet communicated with the water tank, and the nozzle is communicated with the connecting water pipe. According to the high-purity phosphorus collecting tower disclosed by the utility model, the occupied area of equipment is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical equipment, in particular to a high-purity phosphorus collection tower. Background Art

[0002] High-purity phosphorus usually refers to elemental phosphorus containing 99.9999% (6N) phosphorus in the product. Elemental phosphorus above 6N is an important raw material for the production of electronic-grade red phosphorus and phosphorus compounds, such as chlorinated phosphorus and electronic-grade phosphoric acid. Acidic oxidation method for purifying commercial-grade yellow phosphorus is a traditional yellow phosphorus purification process that has been widely studied. It mainly uses the principle that liquid yellow phosphorus is incompatible with aqueous solution.

[0003] The devices on the market that collect phosphorus through atomization are generally structures with multiple collection towers connected in series horizontally, and the equipment occupies a large area. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. The utility model provides a high-purity phosphorus collection tower, which reduces the equipment footprint.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a high-purity phosphorus collection tower, comprising a collection tank, a spray assembly and a tower body extending in a height direction, the spray assembly comprising a nozzle and a connecting water pipe for connecting to a water tank, the nozzle being connected in the tower body, the tower body being provided with a lower port and at least two reaction air inlets for sealingly connecting to a reaction tube, the adjacent reaction air inlets being arranged at intervals in a height direction, the collection tank, the lower port and the reaction air inlet being respectively located below the nozzle, the lower port extending into the collection tank, the lower end of the collection tank being provided with a finished product outlet and a finished product valve for outflow of finished products, the finished product valve being connected to the finished product outlet, the upper end of the collection tank being provided with a circulating liquid outlet for communicating with the water tank, and the nozzle being communicated with the connecting water pipe.

[0006] As a preferred solution, the spray assembly further comprises a spray dispersion plate connected to the tower body, the spray dispersion plate being provided with a plurality of dispersion through holes, and the spray dispersion plate being located between the nozzle and the reaction air inlet in the height direction.

[0007] As a preferred embodiment, the upper end of the tower body is connected to a tower end plate, and the spray assembly also includes a spray pipe located in the tower body, one end of the spray pipe is connected to the tower end plate and communicated with the connecting water pipe, and the spray pipe is connected to a plurality of the nozzles at intervals along the height direction, and the plurality of nozzles are respectively communicated with the spray pipe.

[0008] As a preferred embodiment, the tower end plate is connected to a dispersion connecting rod extending in the height direction, one end of the dispersion connecting rod is connected to the tower end plate, the dispersion connecting rod is connected to a plurality of the spray dispersion plates at intervals in the height direction, and a corresponding spray dispersion plate is arranged under each nozzle.

[0009] As a preferred solution, a dispersion positioning opening is provided at the edge of the spray dispersion plate, and the spray pipe is plugged into the dispersion positioning opening.

[0010] As a preferred solution, the lower port is located at the upper part of the collecting tank, and a finished product sedimentation area is formed between the lower port and the finished product outlet.

[0011] As a preferred solution, the tower body further comprises a temperature sensor for measuring the temperature inside the tower body. The temperature sensor is connected to the tower end plate, and at least a portion of the temperature sensor extends into the tower body.

[0012] As a preferred embodiment, the tower body also includes an exhaust gas collection assembly, which includes an exhaust gas pipe and an exhaust gas treatment tank for containing water. A wastewater discharge port and a wastewater discharge valve are provided at the lower end of the exhaust gas treatment tank. The wastewater discharge valve is connected to the wastewater discharge port. One end of the exhaust gas pipe is inserted into the tower body through the tower end plate, and the other end of the exhaust gas pipe is connected to the exhaust gas treatment tank.

[0013] As a preferred solution, a tail gas discharge port for discharging tail gas is provided at the upper end of the tail gas treatment tank.

[0014] As a preferred embodiment, the exhaust gas collection assembly also includes an anti-backflow tank and an exhaust gas cannula for inserting into the liquid in the exhaust gas treatment tank, the anti-backflow tank is provided with an upper interface and a lower interface, the upper interface is located at the upper part of the anti-backflow tank and is connected to the exhaust gas pipeline, the lower interface is located at the lower part of the anti-backflow tank and is connected to the exhaust gas cannula, the upper end of the exhaust gas treatment tank is provided with an exhaust gas inlet, and the lower end of the exhaust gas cannula is inserted into the exhaust gas treatment tank through the exhaust gas inlet.

[0015] Compared with the prior art, the high-purity phosphorus collection tower of the utility model embodiment has the following beneficial effects: the nozzle is located in the tower body and arranged above the tower body, the tower body is provided with a lower port and a reaction air inlet, the phosphorus vapor and gaseous hydrochloric acid generated in the reaction tube enter the tower body from the reaction air inlet, and are sprayed by the nozzle in the tower body to form a spray, the spray cools the phosphorus vapor into liquid phosphorus, the atomized and collected liquid phosphorus flows into the collection tank under the action of gravity, the specific gravity of the liquid phosphorus is heavier than that of water, and it is precipitated at the bottom of the collection tank, the finished product valve is opened, the liquid phosphorus flows out from the finished product outlet for collection, the gaseous hydrochloric acid is dissolved in the atomized water, and the atomized water flows into the water tank at the circulating liquid outlet at the upper end of the collection tank. The tower body as a whole extends in the height direction, and a plurality of reaction air inlets are arranged at intervals in the height direction, so that the collection tower as a whole and the reaction tubes connected thereto are arranged in the height direction, reducing the equipment footprint. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the utility model.

[0017] Figure 2 It is a schematic diagram of the assembly structure of the collecting tank and the tower body according to the embodiment of the utility model.

[0018] Figure 3 It is a schematic diagram of the structure of the spray assembly in the tower body of the utility model embodiment.

[0019] Figure 4 It is a schematic diagram of the use status of the nozzle of the embodiment of the utility model.

[0020] Figure 5 It is a diagram of a spray assembly within a tower body according to an embodiment of the present utility model.

[0021] Figure 6 It is a schematic structural diagram of the tail gas collection assembly of an embodiment of the utility model.

[0022] In the figure:

[0023] 10. Collection tank; 11. Finished product outlet; 12. Finished product valve; 13. Circulating liquid outlet;

[0024] 20. Spray assembly; 21. Nozzle; 22. Connecting water pipe; 24. Spray dispersion plate; 25. Dispersion positioning port; 26. Dispersion through hole; 27. Spray pipeline;

[0025] 30. Tower body; 31. Lower port; 32. Reaction air inlet; 33. Tower end plate; 34. Dispersion connecting rod; 35. Temperature sensor;

[0026] 40. Exhaust gas collection assembly; 41. Exhaust gas pipeline; 42. Exhaust gas treatment tank; 43. Exhaust gas inlet; 44. Wastewater discharge port; 45. Wastewater discharge valve; 46. Exhaust gas discharge port; 47. Anti-backflow tank; 48. Exhaust gas intubation; 49. Upper interface; 50. Lower interface;

[0027] 60. Reaction tube; 61. Liquid phosphorus. DETAILED DESCRIPTION

[0028] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0029] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like used in the present invention to indicate the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0030] In the description of the present invention, it should be understood that the terms "connected", "connected", "fixed" and the like used in the present invention should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, or a welding connection; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] like Figures 1 to 6 As shown, a high-purity phosphorus collection tower according to a preferred embodiment of the utility model comprises a collection tank 10, a spray assembly 20 and a tower body 30 extending in a height direction, the spray assembly 20 comprises a nozzle 21 and a connecting water pipe 22 for connecting to a water tank, the nozzle 21 is connected to the tower body 30, the tower body 30 is provided with a lower port 31 and at least two reaction air inlets 32 for sealingly connecting to a reaction tube 60, adjacent reaction air inlets 32 are arranged at intervals in a height direction, the collection tank 10, the lower port 31 and the reaction air inlet 32 ​​are respectively located below the nozzle 21, the lower port 31 extends into the collection tank 10, the collection tank 10 is provided with a finished product outlet 11 and a finished product valve 12 for the outflow of finished products at the lower end, the finished product valve 12 is connected to the finished product outlet 11, the collection tank 10 is provided with a circulating liquid outlet 13 for communicating with a water tank at the upper end, and the nozzle 21 is communicated with the connecting water pipe 22.

[0032] In the high-purity phosphorus collection tower of the utility model, the nozzle 21 is located in the tower body 30 and arranged above the tower body 30. The tower body 30 is provided with a lower port 31 and a reaction air inlet 32. The phosphorus vapor and gaseous hydrochloric acid generated in the reaction tube 60 enter the tower body 30 from the reaction air inlet 32, and are sprayed by the nozzle 21 in the tower body 30 to form a spray. The spray cools the phosphorus vapor into liquid phosphorus 61. The atomized and collected liquid phosphorus 61 flows into the collection tank 10 under the action of gravity. The specific gravity of the liquid phosphorus 61 is heavier than that of water, and it is precipitated at the bottom of the collection tank 10. The finished product valve 12 is opened, and the liquid phosphorus 61 flows out from the finished product outlet 11 for collection. The gaseous hydrochloric acid is dissolved in the atomized water, and the atomized water flows into the water tank at the circulating liquid outlet 13 at the upper end of the collection tank 10. The tower body 30 extends in the height direction as a whole, and a plurality of reaction air inlets 32 are arranged at intervals in the height direction, so that the collection tower as a whole and the reaction tube 60 connected thereto are arranged in the height direction, thereby reducing the equipment footprint.

[0033] As one embodiment, the water tank is connected to the nozzle 21 via a connecting water pipe 22, so that the liquid in the water tank can be circulated.

[0034] As one embodiment, Figure 4 As shown, the nozzle 21 is an atomizing nozzle 21 , and the spray sprayed by the atomizing nozzle 21 is cone-shaped, and the spray spraying range can cover the radial section of the tower body 30 . The radial section of the tower body 30 is perpendicular to the axis of the tower body 30 .

[0035] As one embodiment, the chemical reaction formula in the reaction tube 60 is: 2PCl3+3H2→2P+6HCl, and gaseous phosphorus and gaseous hydrochloric acid enter the tower body 30 through the reaction air inlet 32.

[0036] Further, such as Figures 1 to 4 As shown, the spray assembly 20 also includes a spray dispersion plate 24 connected to the tower body 30. The spray dispersion plate 24 is provided with a plurality of dispersion through holes 26. The spray dispersion plate 24 is located between the nozzle 21 and the reaction air inlet 32 ​​in the height direction. Phosphorus vapor and gaseous hydrochloric acid enter the tower body 30 from the reaction air inlet 32. The spray dispersion plate 24 is used to disperse the phosphorus vapor and slow down the gas flow rate, so that the spray sprayed from the nozzle 21 contacts the phosphorus vapor and the gaseous hydrochloric acid through the dispersion through holes 26, so that the cooling is more sufficient.

[0037] As one embodiment, Figure 3 As shown, the dispersion holes 26 are evenly distributed on the spray dispersion plate 24, which improves the dispersion effect of phosphorus vapor and gaseous hydrochloric acid and achieves a better cooling effect.

[0038] Further, such as Figures 1 to 4As shown, the upper end of the tower body 30 is connected to a tower end plate 33, and the spray assembly 20 also includes a spray pipe 27 located in the tower body 30. One end of the spray pipe 27 is connected to the tower end plate 33 and communicated with the connecting water pipe 22. The spray pipe 27 is connected to multiple nozzles 21 at intervals along the height direction, and the multiple nozzles 21 are respectively communicated with the spray pipe 27. The tower end plate 33 is connected to the upper end of the tower body 30 to achieve the sealing of the upper end of the tower body 30. One end of the spray pipe 27 is connected to the tower end plate 33 to achieve the fixation of the spray pipe 27. The spray pipe 27 is connected to multiple nozzles 21 arranged at intervals along the height direction, and one end of the spray pipe 27 is communicated with the water tank through the connecting water pipe 22. The multiple nozzles 21 are respectively communicated with the spray pipe 27, so as to increase the number of sprays sprayed by the nozzles 21 and improve the cooling efficiency.

[0039] Further, such as Figures 1 to 4 As shown, the tower end plate 33 is connected to a dispersion connecting rod 34 extending in the height direction, one end of the dispersion connecting rod 34 is connected to the tower end plate 33, and the dispersion connecting rod 34 is connected to multiple spray dispersion plates 24 at intervals in the height direction, and a spray dispersion plate 24 is correspondingly arranged under each nozzle 21. One end of the dispersion connecting rod 34 is connected to the tower end plate 33, and multiple spray dispersion plates 24 are connected to the dispersion connecting rod 34 to achieve the fixation of multiple spray dispersion plates 24. The provision of multiple spray dispersion plates 24 helps to reduce the flow rate of phosphorus vapor and gaseous hydrochloric acid and improve the dispersion degree, so that the cooling is more sufficient.

[0040] As one embodiment, Figures 1 to 4 As shown, the tower end plate 33 is connected to a plurality of dispersion connecting rods 34 , and the dispersion connecting rods 34 are arranged at intervals along the circumference of the spray dispersion plate 24 to improve the connection stability of the spray dispersion plate 24 .

[0041] Further, such as Figure 3 to Figure 4 As shown, a dispersion positioning opening 25 is provided at the edge of the spray dispersion plate 24 , and the spray pipe 27 is plugged into the dispersion positioning opening 25 , so as to realize the positioning of the spray pipe 27 on the spray dispersion plate 24 and improve the installation position accuracy of the spray pipe 27 .

[0042] Further, such as Figure 1 to Figure 2As shown, the lower port 31 is located at the upper part of the collection tank 10, and a finished product precipitation zone is formed between the lower port 31 and the finished product outlet 11. The tower body 30 extends into the collection tank 10 through the upper end surface of the collection tank 10, and the outer peripheral surface of the tower body 30 is sealed and connected with the upper end surface of the collection tank 10 to ensure that the liquid phosphorus 61 cooled in the tower body 30 is precipitated in the collection tank 10 under the action of gravity to prevent overflow. The liquid sprayed in the tower body 30 is not miscible with the liquid phosphorus 61, and the liquid phosphorus 61 has a large specific gravity and is precipitated in the finished product precipitation zone at the bottom of the collection tank 10. The liquid phosphorus 61 is discharged and collected from the finished product outlet 11 under the action of gravity. The sprayed liquid flows out of the water tank through the circulating liquid outlet 13, so that the spray liquid can be recycled.

[0043] As one embodiment, the initial liquid in the water tank is water, which is sprayed into the tower body 30 through the nozzle 21. The gaseous hydrochloric acid is dissolved in the water and drips and is collected at the upper end of the collection tank 10. It enters the water tank through the circulating liquid outlet 13 and is then recycled through the nozzle 21.

[0044] As one embodiment, Figure 1 As shown, a water pump is connected to the water connecting pipe 22. The water pump pumps the liquid in the water tank into the nozzle 21 to promote circulation.

[0045] Furthermore, the tower body 30 also includes a temperature sensor 35 for measuring the temperature inside the tower body 30. The temperature sensor 35 is connected to the tower end plate 33, and at least a portion thereof extends into the tower body 30. The temperature data inside the tower body 30 is obtained through the temperature sensor 35, so as to reasonably control the flow rate of the nozzle 21 to obtain a better cooling effect.

[0046] Further, such as Figure 1 and Figure 6 As shown, the tower body 30 also includes an exhaust gas collection assembly 40, which includes an exhaust gas pipeline 41 and an exhaust gas treatment tank 42 for containing water. The lower end of the exhaust gas treatment tank 42 is provided with a wastewater discharge port 44 and a wastewater discharge valve 45, and the wastewater discharge valve 45 is connected to the wastewater discharge port 44. One end of the exhaust gas pipeline 41 is inserted into the tower body 30 through the tower end plate 33, and the other end of the exhaust gas pipeline 41 is connected to the exhaust gas treatment tank 42. The exhaust gas treatment tank 42 contains water, and the gaseous hydrochloric acid in the tower body 30 flows upward and enters the exhaust gas treatment tank 42 to form exhaust gas. The hydrochloric acid in the exhaust gas dissolves in the water in the exhaust gas treatment tank 42 to form wastewater. The wastewater in the exhaust gas collection tank 10 opens the wastewater discharge valve 45 and is discharged through the wastewater discharge port 44.

[0047] Further, such as Figure 1 and Figure 6 As shown, a tail gas discharge port 46 for discharging tail gas is provided at the upper end of the tail gas treatment tank 42. When the water in the tail gas treatment tank 42 absorbs the tail gas to saturation, the tail gas is discharged from the tail gas discharge port 46.

[0048] Further, such as Figure 1 and Figure 6 As shown, the exhaust gas collection assembly 40 also includes an anti-backflow tank 47 and an exhaust gas cannula 48 for inserting into the liquid in the exhaust gas treatment tank 42. The anti-backflow tank 47 is provided with an upper interface 49 and a lower interface 50. The upper interface 49 is located at the upper part of the anti-backflow tank 47 and is connected to the exhaust gas pipeline 41. The lower interface 50 is located at the lower part of the anti-backflow tank 47 and is connected to the exhaust gas cannula 48. The upper end of the exhaust gas treatment tank 42 is provided with an exhaust inlet 43, and the lower end of the exhaust gas cannula 48 is inserted into the exhaust gas treatment tank 42 through the exhaust inlet 43. The anti-backflow tank 47 is located between the tail gas pipeline 41 and the tail gas treatment tank 42. The two ends of the anti-backflow tank 47 are respectively connected to the tail gas pipeline 41 and the tail gas treatment tank 42. The gaseous phosphorus and gaseous hydrochloric acid in the tower body 30 enter the tail gas treatment tank 42 after passing through the anti-backflow tank 47. The lower interface 50 of the anti-backflow tank 47 is connected to the tail gas intubation tube 48. The lower end of the tail gas intubation tube 48 is inserted into the liquid in the tail gas treatment tank 42 to prevent negative pressure from being generated when the collection tower fails, provide storage space for backflow wastewater, and prevent the wastewater in the tail gas treatment tank 42 from flowing back into the tower body 30.

[0049] In summary, the embodiment of the utility model provides a high-purity phosphorus collection tower, the nozzle 21 is located in the tower body 30 and is arranged above the tower body 30, the tower body 30 is provided with a lower port 31 and a reaction air inlet 32, the phosphorus vapor and gaseous hydrochloric acid generated in the reaction tube 60 enter the tower body 30 from the reaction air inlet 32, and are sprayed by the nozzle 21 in the tower body 30 to form a spray, the spray cools the phosphorus vapor into liquid phosphorus 61, and the atomized and collected liquid phosphorus 61 flows into the collection tank 10 under the action of gravity. The specific gravity of the liquid phosphorus 61 is heavier than that of water and is precipitated at the bottom of the collection tank 10. The finished product valve 12 is opened, and the liquid phosphorus flows out from the finished product outlet 11 for collection, and the gaseous hydrochloric acid is dissolved in the atomized water, and the atomized water flows into the water tank at the circulating liquid outlet 13 at the upper end of the collection tank 10. The tower body 30 extends in the height direction as a whole, and a plurality of reaction air inlets 32 are arranged at intervals in the height direction, so that the collection tower as a whole and the reaction tube 60 connected thereto are arranged in the height direction, reducing the equipment footprint.

[0050] The above are only preferred implementations of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A high-purity phosphorus collection tower, characterized in that: It includes a collecting tank, a spraying assembly and a tower body extending in the height direction, the spraying assembly includes a nozzle and a connecting water pipe for connecting to a water tank, the nozzle is connected in the tower body, the tower body is provided with a lower port and at least two reaction air inlets for sealing connection with a reaction tube, adjacent reaction air inlets are arranged at intervals in the height direction, the collecting tank, the lower port and the reaction air inlet are respectively located below the nozzle, the lower port extends into the collecting tank, the lower end of the collecting tank is provided with a finished product outlet and a finished product valve for outflow of finished products, the finished product valve is connected to the finished product outlet, the upper end of the collecting tank is provided with a circulating liquid outlet for communicating with the water tank, and the nozzle is communicated with the connecting water pipe.

2. The high-purity phosphorus collection tower according to claim 1, characterized in that: The spray assembly also includes a spray dispersion plate connected to the tower body, the spray dispersion plate is provided with a plurality of dispersion through holes, and the spray dispersion plate is located between the nozzle and the reaction air inlet in the height direction.

3. The high-purity phosphorus collection tower according to claim 2, characterized in that: The upper end of the tower body is connected to a tower end plate, and the spray assembly also includes a spray pipe located in the tower body, one end of the spray pipe is connected to the tower end plate and communicated with the connecting water pipe, and the spray pipe is connected with a plurality of nozzles at intervals along the height direction, and the plurality of nozzles are respectively communicated with the spray pipe.

4. The high-purity phosphorus collection tower according to claim 3, characterized in that: The tower end plate is connected with a dispersion connecting rod extending in the height direction, one end of the dispersion connecting rod is connected to the tower end plate, and the dispersion connecting rod is connected with a plurality of the spray dispersion plates at intervals in the height direction, and a corresponding spray dispersion plate is arranged under each nozzle.

5. The high-purity phosphorus collection tower according to claim 3, characterized in that: The edge of the spray dispersion plate is provided with a dispersion positioning opening, and the spray pipe is plugged into the dispersion positioning opening.

6. The high-purity phosphorus collection tower according to claim 1, characterized in that: The lower port is located at the upper part of the collecting tank, and a finished product sedimentation area is formed between the lower port and the finished product outlet.

7. The high-purity phosphorus collection tower according to claim 3, characterized in that: The tower body also includes a temperature sensor for measuring the temperature inside the tower body. The temperature sensor is connected to the tower end plate, and at least a portion of the temperature sensor extends into the tower body.

8. The high-purity phosphorus collection tower according to claim 3, characterized in that: The tower body also includes an exhaust gas collection component, which includes an exhaust gas pipe and an exhaust gas treatment tank for containing water. The lower end of the exhaust gas treatment tank is provided with a wastewater discharge port and a wastewater discharge valve, and the wastewater discharge valve is connected to the wastewater discharge port. One end of the exhaust gas pipe is inserted into the tower body through the tower end plate, and the other end of the exhaust gas pipe is connected to the exhaust gas treatment tank.

9. The high-purity phosphorus collection tower according to claim 8, characterized in that: The upper end of the tail gas treatment tank is provided with a tail gas discharge port for discharging tail gas.

10. The high-purity phosphorus collection tower according to claim 8, characterized in that: The exhaust gas collection assembly also includes an anti-backflow tank and an exhaust gas cannula for inserting into the liquid in the exhaust gas treatment tank. The anti-backflow tank is provided with an upper interface and a lower interface. The upper interface is located at the upper part of the anti-backflow tank and is connected to the exhaust gas pipeline. The lower interface is located at the lower part of the anti-backflow tank and is connected to the exhaust gas cannula. The upper end of the exhaust gas treatment tank is provided with an exhaust gas inlet, and the lower end of the exhaust gas cannula is inserted into the exhaust gas treatment tank through the exhaust gas inlet.

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