An ozone catalytic oxidation tower

Abstract

This utility model discloses an ozone catalytic oxidation tower, relating to the field of wastewater treatment. The ozone catalytic oxidation tower includes: a vertical reaction tower with a drain outlet at its bottom; a catalytic structure including a permeable mesh plate, a catalyst layer, and a power unit, the permeable mesh plate being disposed inside the vertical reaction tower and capable of rotating about the tower's axis; the catalyst layer being disposed on the upper side of the permeable mesh plate and rotating synchronously with it; and the power unit being drive-connected to the permeable mesh plate; a water distribution structure including a wastewater storage tank, a water supply pipe, and a water distributor connected in sequence, the water distributor being disposed in the inner cavity of the vertical reaction tower above the permeable mesh plate; and an ozone supply structure including an ozone generator, a gas supply pipe, and an aeration disc connected in sequence. This application eliminates dead zones in the airflow through rotation, enhancing the uniformity of the three-phase contact between ozone, pollutants, and the catalyst, thereby improving not only the reaction sufficiency but also the catalyst utilization rate.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and more specifically, to an ozone catalytic oxidation tower. Background Technology

[0002] Ozone catalytic oxidation technology is an advanced oxidation technology that combines the strong oxidizing properties of ozone with the activation effect of a catalyst. The catalyst promotes the decomposition of ozone to generate more potent and non-selective hydroxyl radicals (・OH), which efficiently degrade recalcitrant pollutants (such as phenols, polycyclic aromatic hydrocarbons, VOCs, etc.) in water or gas. It overcomes the shortcomings of ozone oxidation alone, such as low efficiency and incomplete degradation of complex pollutants, and is widely used in fields such as advanced industrial wastewater treatment and odor gas purification.

[0003] As the core equipment of this technology, the ozone catalytic oxidation tower works by achieving a synergistic reaction of "ozone activation - pollutant oxidation" through the catalytic layer inside the tower: the fluid to be treated (wastewater or waste gas) and ozone enter the tower through the water / gas distribution system. In the catalytic layer, the active sites on the surface of the catalyst (such as transition metal oxides) adsorb ozone and promote its decomposition into •OH. At the same time, pollutant molecules are adsorbed, causing the two to react rapidly at the interface. Through processes such as bond breaking and ring opening, the pollutants are converted into harmless substances, and the finally purified fluid is discharged from the tower.

[0004] However, the fixed catalyst bed widely used in the tower has obvious limitations: the fixed catalyst layer is prone to the formation of a thick liquid film on its surface or the creation of dead air flow, resulting in uneven contact between ozone, pollutants and catalyst, which in turn causes incomplete reaction in some areas and directly affects the stability of treatment efficiency. Utility Model Content

[0005] The purpose of this invention is to provide an ozone catalytic oxidation tower, which aims to solve the technical problems in the background art mentioned above.

[0006] The embodiments of this utility model are implemented as follows: This application provides an ozone catalytic oxidation tower, comprising: a vertical reaction tower with a drain outlet at the bottom and an exhaust outlet at the top; a catalytic structure including a permeable mesh plate, a catalyst layer, and a power component, wherein the permeable mesh plate is disposed inside the vertical reaction tower and is capable of rotating about the axis of the vertical reaction tower; the catalyst layer is disposed on the upper side of the permeable mesh plate and rotates synchronously with the permeable mesh plate; the power component is connected to the permeable mesh plate for driving the permeable mesh plate to rotate; a water distribution structure including a sewage storage tank, a water supply pipe, and a water distributor connected in sequence, wherein the water distributor is disposed in the inner cavity of the vertical reaction tower above the permeable mesh plate; and an ozone gas supply structure including an ozone generator, a gas supply pipe, and an aeration disc connected in sequence, wherein the aeration disc is disposed in the inner cavity of the vertical reaction tower below the permeable mesh plate.

[0007] Furthermore, based on the aforementioned scheme, the power component includes: a drive motor, which is disposed on the top of the outer side of the vertical reaction tower; and a transmission shaft, which drivesly connects the output shaft of the drive motor to the permeable mesh plate.

[0008] Furthermore, based on the aforementioned scheme, the aforementioned drive shaft passes through the aforementioned permeable mesh plate, and a first stirring paddle and a second stirring paddle are fixedly sleeved on the aforementioned drive shaft; wherein, the aforementioned first stirring paddle is located between the aforementioned permeable mesh plate and the aforementioned water distributor, and the aforementioned second stirring paddle is located between the aforementioned permeable mesh plate and the aforementioned aeration disc.

[0009] Furthermore, based on the aforementioned scheme, the vertical reaction tower includes a lower cylinder, an intermediate cylinder, and an upper cylinder connected sequentially from bottom to top. The first stirring impeller and the water distributor are both disposed in the inner cavity of the upper cylinder, the permeable mesh plate and the catalyst layer are both disposed in the inner cavity of the intermediate cylinder, and the second stirring impeller and the aeration disc are disposed in the inner cavity of the lower cylinder. The inner diameter of the upper cylinder is equal to that of the lower cylinder, and the inner diameter of the intermediate cylinder is greater than that of both the upper cylinder and the lower cylinder.

[0010] Furthermore, based on the aforementioned scheme, the intermediate cylinder includes a first cylinder and a second cylinder that can be detachably coupled. The end of the first cylinder away from the second cylinder is fixedly connected to the upper cylinder, and the end of the second cylinder away from the first cylinder is fixedly connected to the lower cylinder.

[0011] Furthermore, based on the aforementioned scheme, the first cylinder and the second cylinder are detachably connected via a flange structure.

[0012] Furthermore, based on the aforementioned scheme, the drive shaft has an axially formed docking slot on its annular side, and the end of the docking slot away from the drive motor passes through the end face of the drive shaft. An annular insert is detachably inserted into the docking slot. The permeable mesh plate, the first stirring paddle, and the second stirring paddle are all disposed on the annular insert, and the first stirring paddle and the second stirring paddle are detachably connected to the annular insert by screws. The end face of the drive shaft away from the drive motor is also provided with an anti-detachment structure for preventing the annular insert from detaching and limiting its position.

[0013] Furthermore, based on the aforementioned scheme, the anti-detachment structure includes: a positioning screw, which is coaxially disposed on the side of the transmission shaft away from the drive motor; and an anti-detachment nut, which is threadedly engaged with the positioning screw.

[0014] Furthermore, based on the aforementioned scheme, an annular barrier is provided circumferentially along the edge of the upper side of the permeable mesh plate, and the catalyst layer is disposed inside the annular barrier; wherein, the height of the annular barrier is higher than the height of the catalyst layer.

[0015] Furthermore, based on the aforementioned scheme, valves are installed on the water supply pipe.

[0016] Compared with the prior art, the embodiments of this utility model have at least the following advantages or beneficial effects: In the ozone catalytic oxidation tower of this application embodiment, the power unit drives the permeable mesh plate and the catalyst layer above it to rotate around the axis of the vertical reaction tower. The water distributor evenly distributes the wastewater on the surface of the rotating catalyst layer, and centrifugal force is used to form a thin liquid film in the wastewater (avoiding a thick liquid film that hinders mass transfer). At the same time, ozone is introduced from below the permeable mesh plate by the aeration disc. The ozone can penetrate the mesh plate and fully contact the pollutants and catalyst in the thin liquid film. Under the activation of the catalyst, it efficiently generates OH- and oxidizes and degrades the pollutants. This design eliminates dead air zones through rotation, enhances the uniformity of three-phase contact between ozone, pollutants and catalyst, not only improving the sufficiency of the reaction but also increasing the catalyst utilization rate, thereby enhancing the stability of the treatment efficiency. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is an isometric view of an ozone catalytic oxidation tower according to an embodiment of the present invention; Figure 2This is a top view of an ozone catalytic oxidation tower according to an embodiment of the present invention; Figure 3 for Figure 2 A cross-sectional view along the AA direction; Figure 4 for Figure 3 A magnified view of part B in the image; Figure 5 This is an isometric view of the internal structure of an ozone catalytic oxidation tower according to an embodiment of the present invention; Figure 6 This is an isometric view of the power assembly, first impeller, second impeller, and catalytic structure before docking in an embodiment of this utility model. Figure 7 This is an isometric view of the drive shaft according to an embodiment of the present invention; Figure 8 This is an isometric view of the annular insert according to an embodiment of the present invention.

[0019] Icons: 1-Vertical reaction tower, 101-Lower cylinder, 102-Intermediate cylinder, 1021-First cylinder, 1022-Second cylinder, 103-Upper cylinder, 2-Exhaust port, 3-Drive motor, 4-Sewage storage tank, 5-Water supply pipe, 6-Flange structure, 7-Gas supply pipe, 8-Ozone generator, 9-Valve, 10-Drive shaft, 11-First stirring paddle, 12-Water distributor, 13-Catalyst layer, 14-Second stirring paddle, 15-Aeration disc, 16-Drain outlet, 17-Annular enclosure, 18-Permeable mesh plate, 19-Annular insert, 20-Docking slot, 21-Positioning screw. Detailed Implementation

[0020] The embodiments of this application will now be described in detail with reference to the accompanying drawings. Example

[0021] Please refer to Figures 1-8This application provides an ozone catalytic oxidation tower, comprising: a vertical reaction tower 1, with a drain outlet 16 at its bottom and an exhaust outlet 2 at its top; a catalytic structure, including a permeable mesh plate 18, a catalyst layer 13, and a power component, wherein the permeable mesh plate 18 is disposed inside the vertical reaction tower 1 and can rotate about the axis of the vertical reaction tower 1; the catalyst layer 13 is disposed on the upper side of the permeable mesh plate 18 and rotates synchronously with the permeable mesh plate 18; the power component is connected to the permeable mesh plate 18 for driving the permeable mesh plate 18 to rotate; a water distribution structure, including a sewage storage tank 4, a water supply pipe 5, and a water distributor 12 connected in sequence, wherein the water distributor 12 is disposed in the inner cavity of the vertical reaction tower 1 above the permeable mesh plate 18; and an ozone gas supply structure, including an ozone generator 8, a gas supply pipe 7, and an aeration disc 15 connected in sequence, wherein the aeration disc 15 is disposed in the inner cavity of the vertical reaction tower 1 below the permeable mesh plate 18.

[0022] In the ozone catalytic oxidation tower of this embodiment, the power unit drives the permeable mesh plate 18 and the catalyst layer 13 above it to rotate around the axis of the vertical reaction tower 1. The water distributor 12 evenly distributes the wastewater on the surface of the rotating catalyst layer 13, and centrifugal force is used to form a thin liquid film in the wastewater (avoiding a thick liquid film from hindering mass transfer). At the same time, the aeration disc 15 introduces ozone from below the permeable mesh plate 18. The ozone can penetrate the mesh plate and fully contact the pollutants and catalyst in the thin liquid film. Under the activation of the catalyst, it efficiently generates OH and oxidizes and degrades the pollutants. This design eliminates dead air zones through rotation, enhances the uniformity of the three-phase contact between ozone, pollutants and catalyst, not only improving the reaction sufficiency but also increasing the catalyst utilization rate, thereby enhancing the stability of the treatment efficiency.

[0023] Specifically, a mechanical seal structure can be adopted at the rotation point between the permeable mesh plate 18 and the vertical reaction tower 1: it consists of a rotating ring that rotates with the permeable mesh plate 18, a stationary ring fixed on the reaction tower shell, and a spring assembly that provides pre-tightening force. The tight fit between the rotating ring and the stationary ring forms a sealing surface, which can not only adapt to the relative rotation of the two, but also effectively block the water flow channel and prevent water leakage. This structure is reliable, wear-resistant, and adaptable to rotation conditions, and can ensure a stable sealing effect for a long time.

[0024] In a preferred embodiment, the power assembly includes: a drive motor 3, which is disposed on the top of the outer side of the vertical reaction tower 1; and a transmission shaft 10, which drives the output shaft of the drive motor 3 to the permeable mesh plate 18.

[0025] In the above embodiment, by setting the drive motor 3 on the top of the outer side of the vertical reaction tower 1, the power output of the motor is transmitted to the permeable mesh plate 18 inside the tower via the transmission shaft 10, driving the permeable mesh plate 18 and the catalyst layer 13 above it to rotate stably. Its advantages are: external placement of the drive motor 3 avoids direct contact with corrosive media such as ozone and wastewater inside the tower, significantly reducing the risk of motor corrosion failure and extending equipment life; top installation facilitates motor inspection and maintenance, reducing the space occupied inside the tower; the direct transmission method of the transmission shaft 10 results in low power loss, ensuring stable rotation speed of the permeable mesh plate 18, thereby ensuring uniform rotation of the catalyst layer 13, continuously forming a thin liquid film through centrifugal force and eliminating mass transfer dead zones, thus enhancing the three-phase contact efficiency of ozone, pollutants, and catalyst.

[0026] In a preferred embodiment, the drive shaft 10 passes through the permeable mesh plate 18, and a first stirring paddle 11 and a second stirring paddle 14 are fixedly sleeved on the drive shaft 10; wherein, the first stirring paddle 11 is located between the permeable mesh plate 18 and the water distributor 12, and the second stirring paddle 14 is located between the permeable mesh plate 18 and the aeration disc 15.

[0027] In the above embodiment, the drive shaft 10 drives the permeable mesh plate 18 and the catalyst layer 13 to rotate simultaneously, while also driving the first stirring paddle 11 and the second stirring paddle 14 to rotate synchronously. The first stirring paddle 11, located between the permeable mesh plate 18 and the water distributor 12, can pre-disperse the sewage discharged from the water distributor 12, preventing the sewage from accumulating locally on the surface of the catalyst layer 13; the second stirring paddle 14, located between the permeable mesh plate 18 and the aeration disc 15, can cut and break the ozone bubbles released by the aeration disc 15 into smaller bubbles, and enhance the diffusion and mixing of ozone in the water. Its advantages are: through the synergy of the double stirring paddles and the rotating catalyst layer 13, the initial distribution uniformity of sewage on the surface of the catalyst layer 13 is improved, and the contact area and dissolution efficiency between ozone and sewage are increased, further eliminating mass transfer dead zones; at the same time, the stirring action can reduce the fluctuation of the liquid film thickness on the surface of the catalyst layer 13, and with the centrifugal force, a more stable reaction interface is formed, significantly improving the three-phase reaction efficiency of ozone, pollutants and catalyst.

[0028] Optionally, the stirring action of the second stirring paddle 14 can also drive ozone to migrate towards the catalyst layer 13.

[0029] In a preferred embodiment, the vertical reaction tower 1 includes a lower cylinder 101, an intermediate cylinder 102, and an upper cylinder 103 connected sequentially from bottom to top. The first stirring paddle 11 and the water distributor 12 are both disposed in the inner cavity of the upper cylinder 103, the permeable mesh plate 18 and the catalyst layer 13 are both disposed in the inner cavity of the intermediate cylinder 102, and the second stirring paddle 14 and the aeration disc 15 are both disposed in the inner cavity of the lower cylinder 101. The inner diameter of the upper cylinder 103 is equal to that of the lower cylinder 101, and the inner diameter of the intermediate cylinder 102 is greater than both the inner diameter of the upper cylinder 103 and the inner diameter of the lower cylinder 101.

[0030] In the above embodiment, the intermediate cylinder 102, serving as the core reaction zone, employs a larger inner diameter, providing ample space for the rotation of the permeable mesh plate 18 and the catalyst layer 13. This reduces fluid disturbance resistance during rotation, allowing the catalyst layer 13 to more evenly spread the wastewater into a thin liquid film under centrifugal force. Simultaneously, it reduces the risk of friction between the reaction zone and the cylinder wall, extending equipment lifespan. The upper cylinder 103 and lower cylinder 101 employ smaller and equal inner diameters. The compact space of the upper cylinder facilitates the concentrated water distribution by the water distributor 12, followed by rapid pre-dispersion of the wastewater by the first stirring paddle 11, avoiding uneven initial distribution. The compact space of the lower cylinder allows for the concentrated release of ozone by the aeration disc 15, working in conjunction with the second stirring paddle 14 to efficiently break and diffuse bubbles, providing a sufficient and uniform ozone supply for the reaction in the intermediate cylinder. This "small-space pretreatment - large-space high-efficiency reaction" zoning design strengthens the functional synergy of each stage, clarifies the equipment layout, and improves the contact efficiency and reaction stability of ozone, wastewater, and catalyst.

[0031] In a preferred embodiment, the intermediate cylinder 102 includes a first cylinder 1021 and a second cylinder 1022 that are detachably coupled. The end of the first cylinder 1021 away from the second cylinder 1022 is fixedly connected to the upper cylinder 103, and the end of the second cylinder 1022 away from the first cylinder 1021 is fixedly connected to the lower cylinder 101.

[0032] In the above embodiment, the intermediate cylinder 102 serves as the core reaction zone. The internal components such as the permeable mesh plate 18 and the catalyst layer 13 need to be regularly inspected, replaced, or cleaned. The detachable connection between the first cylinder 1021 and the second cylinder 1022 allows for quick opening of the intermediate area and direct contact with the internal core components, avoiding the cumbersome operation of disassembling the upper and lower connecting structures required for the integral cylinder.

[0033] In a preferred embodiment, the first cylinder 1021 and the second cylinder 1022 are detachably connected by the flange structure 6.

[0034] In the above embodiments, the first cylinder 1021 and the second cylinder 1022 are detachably connected by the flange structure 6, which can not only ensure the sealing performance and structural stability of the connection, but also enable quick disassembly and assembly, making it convenient to inspect or replace the core components such as the permeable mesh plate 18 and the catalyst layer 13 in the intermediate cylinder 102.

[0035] In a preferred embodiment, the drive shaft 10 has an axially formed docking slot 20 on its annular side, and the end of the docking slot 20 away from the drive motor 3 passes through the end face of the drive shaft 10. The docking slot 20 is detachably connected to an annular insert 19. The permeable mesh plate 18, the first stirring paddle 11, and the second stirring paddle 14 are all disposed on the annular insert 19, and the first stirring paddle 11 and the second stirring paddle 14 are detachably connected to the annular insert 19 by screws. The end face of the drive shaft 10 away from the drive motor 3 is also provided with an anti-detachment structure to limit the annular insert 19 from detachment.

[0036] In the above embodiment, the drive shaft 10 forms a detachable plug-in connection with the annular cylinder 19 through the axial docking slot 20. Driven by the drive motor 3, the drive shaft 10 transmits torque through the slot, driving the annular cylinder 19 and its permeable mesh plate 18, first stirring paddle 11, and second stirring paddle 14 to rotate synchronously. The anti-detachment structure restricts the axial displacement of the annular cylinder 19 from the end face of the drive shaft 10, ensuring stable transmission. The first stirring paddle 11 and the second stirring paddle 14 are detachably connected to the annular cylinder 19 by screws, facilitating independent disassembly and assembly. Its advantages are: the modular design of the slot and the annular cylinder 19 allows the core components such as the permeable mesh plate 18 and stirring paddles to be disassembled and assembled from the drive shaft 10 as a whole, greatly simplifying the maintenance process (such as when replacing the catalyst layer 13 or repairing the stirring paddle, there is no need to disassemble the connection between the drive shaft 10 and the motor); the individual detachable design of the stirring paddles allows for targeted replacement of worn parts, reducing maintenance costs; the anti-detachment structure ensures the reliability of the connection during rotation, preventing loose parts from affecting reaction efficiency, and improving the overall maintenance convenience and operational stability of the equipment.

[0037] In a preferred embodiment, the anti-detachment structure includes: a positioning screw 21, which is coaxially disposed on the side of the transmission shaft 10 away from the drive motor 3; and an anti-detachment nut, which is threadedly engaged with the positioning screw 21.

[0038] In the above embodiment, the threaded engagement between the positioning screw 21 and the anti-loosening nut can form a stable axial limit on the annular insert 19. By tightening the nut, the preload can be precisely adjusted to ensure that the annular insert 19 does not move axially or fall off when the drive shaft 10 rotates at high speed, thus ensuring transmission stability. At the same time, the detachable nature of the threaded connection makes disassembly and assembly simple. The annular insert 19 can be removed simply by loosening the nut, which facilitates the inspection or replacement of components such as the permeable mesh plate 18 and the agitator. Moreover, the structure is simple and low-cost, and it can be efficiently adapted to the slot-type docking design of the drive shaft 10, further improving the convenience of equipment maintenance and the reliability of operation.

[0039] In a preferred embodiment, an annular barrier 17 is provided circumferentially on the edge of the upper side of the permeable mesh plate 18, and the catalyst layer 13 is disposed inside the annular barrier 17; wherein, the height of the annular barrier 17 is higher than the height of the catalyst layer 13.

[0040] In the above embodiment, the height of the annular enclosure 17 is higher than that of the catalyst layer 13, which can form a relatively closed reaction space inside it. This allows the wastewater after water distribution to evenly cover the catalyst surface inside the enclosure, reducing the phenomenon that the liquid will slide directly from the edge due to excessive rotation. This prolongs the contact time between the wastewater and the catalyst and ozone, further improving the sufficiency of the reaction. Moreover, the structure is simple and can effectively constrain the catalyst and reaction medium without additional power, thus enhancing the stability of equipment operation.

[0041] As a preferred embodiment, the water supply pipe 5 is equipped with a valve 9.

[0042] In the above embodiments, valve 9 can flexibly control the water flow and flow rate.

[0043] Furthermore, unless otherwise explicitly specified or limited, the terms "installation" and "connection" in this application embodiment should be interpreted broadly. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. The terms "upper," "lower," "left," "right," "inner," "outer," and "side," etc., are merely for reference to the direction in the accompanying drawings or the usual placement of the product during use. They are only for clearly describing this application and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limitations on this application. The terms "first," "second," etc., are only used for distinguishing descriptions and should not be construed as indicating or implying relative importance; "multiple" refers to at least two. In this application embodiment, the limitations on relative positional relationships such as parallel, perpendicular, and aligned are all relative to the current technological level and are not absolutely strict limitations. Slight deviations are allowed; approximations of parallel, perpendicular, and aligned are all acceptable. For example, "A and B are parallel" means that A and B are parallel or approximately parallel, and the angle between A and B can be between 0 degrees and 10 degrees.

[0044] The above are only some embodiments and implementation methods of this application. The protection scope of this application is not limited thereto. In the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other. Any combination of features in different embodiments is also within the protection scope of this application. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the protection scope of this application.

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