CN212262900U

CN212262900U - VOC photocatalysis treatment system

Info

Publication number: CN212262900U
Application number: CN202020612100.0U
Authority: CN
Inventors: 杨彦松; 易争明
Original assignee: Xiangtan University
Current assignee: Xiangtan University
Priority date: 2020-04-22
Filing date: 2020-04-22
Publication date: 2021-01-01
Anticipated expiration: 2030-04-22

Abstract

The utility model provides a VOC photocatalytic treatment system, it includes catalytic treatment device, deposits device and catalyst regeneration device, it is separated to become to be located to deposit the device first settling zone, the position of catalytic treatment device below the second settling zone and the position of catalyst regeneration device below first settling zone with clarification area between the second settling zone, first settling zone pass through the pipeline with catalyst regeneration device connects, clarification area pass through the pipeline respectively with catalytic treatment device with catalyst regeneration device connects, the second settling zone pass through the pipeline with catalytic treatment device connects, catalytic treatment device be equipped with the first opening that the settling device is linked together, catalyst regeneration device be equipped with the second opening that the settling device is linked together, VOC photocatalytic treatment system is still including locating first drainage board of first opening with locate second open-ended second draws A flow plate.

Description

VOC photocatalysis treatment system

[ technical field ] A method for producing a semiconductor device

The utility model relates to an organic waste gas handles technical field, especially relates to a VOC photocatalysis processing system.

[ background of the invention ]

In industrial production, particularly in the printing industry, exhaust gas generated in the production process includes a large amount of Volatile Organic Compounds (VOC), and is emitted through the surface of a printing material and discharged outside a workshop through a pipeline without any treatment, thereby causing serious pollution to the atmospheric environment.

In the related art, organic waste gas treatment is generally selected from activated carbon adsorption, solution absorption recovery, condensation recovery, combustion oxidation, and the like, but in the treatment process of the above methods, a large amount of raw materials are consumed, and the requirement of low energy consumption cannot be met, therefore, a photocatalytic degradation technology is gradually used, which is based on the principle that radicals with extremely high activity are generated in a reaction system, and then the pollutants are completely degraded into inorganic substances through the processes of addition, substitution, electron transfer, and the like between the radicals and organic pollutants in the waste gas, and the inorganic substances are discharged after forming clean gas, so that the pollution reduction effect is good. The existing VOC photocatalytic treatment system for treating waste gas by utilizing a photocatalytic degradation technology generally comprises a catalytic treatment device, a precipitation device and a catalyst regeneration device, wherein a catalyst in the catalytic treatment device drops into the precipitation device for precipitation after treating the waste gas, the precipitated and layered catalyst is sent into the catalyst regeneration device for regeneration, and the precipitated clear liquid and the regenerated catalyst are returned to the catalytic treatment device for waste gas treatment so as to realize recycling. However, since the catalyst in the catalytic treatment device directly falls into the precipitation device, the solid catalyst which is already precipitated in the precipitation device is moved by the newly falling catalyst, so that the precipitation time of the catalyst in the precipitation device is too long.

Therefore, there is a need to provide a new VOC photocatalytic treatment system to solve the above problems.

[ Utility model ] content

Based on the above problem, the utility model provides a new VOC photocatalysis processing system.

The utility model provides a VOC photocatalysis treatment system, including catalytic treatment device, sediment device and catalyst regenerating unit, catalytic treatment device with catalyst regenerating unit install in the top of sediment device and mutual interval, sediment device is separated into be located first settling zone of catalytic treatment device below, be located second settling zone of catalyst regenerating unit below and be located first settling zone with clarification area between the second settling zone, first settling zone pass through the pipeline with catalyst regenerating unit connects, clarification area pass through the pipeline respectively with catalytic treatment device with catalyst regenerating unit connects, second settling zone pass through the pipeline with catalytic treatment device connects, catalytic treatment device bottom be equipped with the first opening that sediment device is linked together just first opening is just right first settling zone sets up, the VOC photocatalytic treatment system also comprises a first flow guiding plate arranged at one side of the first opening far away from the second opening and a second flow guiding plate arranged at one side of the second opening far away from the first opening, wherein the first flow guiding plate comprises a first straight flow plate fixed at one side edge of the first opening and vertically extending towards the first settling zone, a first inclined plate obliquely extending from the tail end of the first straight flow plate towards the direction of the central axis close to the first opening and a second straight flow plate vertically extending from the tail end of the first inclined plate towards the bottom of the first settling zone, and the second flow guiding plate comprises a third straight flow plate fixed at one side edge of the second opening and vertically extending towards the second settling zone, The second inclined plate extends from the tail end of the third straight flow plate in an inclined mode towards the direction close to the central axis of the second opening, and the fourth straight flow plate extends from the tail end of the second inclined plate to the bottom of the second settling zone in a vertical mode.

Preferably, the first and second flow conduction plates are symmetrically disposed about the clarification zone.

Preferably, the volumes of the first settling zone and the second settling zone are both greater than the volume of the clarification zone.

Preferably, the sedimentation device comprises a top wall, a bottom wall opposite to the top wall, a side wall connecting the top wall and the bottom wall, and two partition plates fixed to the bottom wall and arranged at intervals, wherein the top wall, the bottom wall and the side wall are matched to form an accommodating space, the height of each partition plate is smaller than that of the side wall, the accommodating space is divided by the two partition plates to form the first sedimentation region, the clarification region and the second sedimentation region, and the catalytic treatment device and the catalyst regeneration device are installed on the top wall.

Preferably, an orthographic projection of the first inclined plate on the partition plate exceeds the partition plate, and an orthographic projection of the second inclined plate on the partition plate exceeds the partition plate.

Preferably, the lateral wall corresponds first play liquid hole has been seted up to the position of first settling zone, corresponds the second play liquid hole has been seted up to the position of clarification district, corresponds the third play liquid hole has been seted up to the position of second settling zone, first play liquid hole, second go out liquid hole and the third go out liquid hole all set up in lateral wall bottom position, first go out liquid hole pass through the pipeline with catalyst regeneration device connects, the second go out liquid hole pass through the pipeline respectively with catalytic treatment device with catalyst regeneration device connects, the third go out liquid hole pass through the pipeline with catalytic treatment device connects.

Preferably, a clear liquid circulating port is further formed in the position, corresponding to the first settling zone, of the side wall, and the set height of the clear liquid circulating port is slightly lower than that of the partition plate.

Preferably, catalytic treatment device including have the air inlet first casing, accept in first nozzle in the first casing and with the catalysis light source that first nozzle interval set up, waste gas by the air inlet gets into, first nozzle pass through the pipeline with second goes out liquid hole and third and goes out liquid hole intercommunication for drench and spout the treatment fluid, including the catalyst in the treatment fluid.

Preferably, the first nozzle is arranged in the direction opposite to the moving direction of the gas, and the catalyst is TiO₂。

Preferably, the catalyst regeneration device comprises a second shell with a gas outlet, a second nozzle contained in the second shell, a packing layer arranged below the second nozzle, a microwave device annularly arranged around the packing layer, a demisting layer fixed at one end of the second shell close to the gas outlet, and a mechanical baffle fixed at one end of the second shell close to the precipitation device, wherein the second nozzle and the packing layer are positioned between the demisting layer and the mechanical baffle, the treated gas is discharged from the gas outlet, the second nozzle is communicated with the first liquid outlet through a pipeline, and the direction of the second nozzle is opposite to the moving direction of the gas.

Compared with the prior art, the utility model provides a VOC photocatalytic treatment system sets up first drainage plate and catalyst regenerating unit and the second opening part that deposits the device and be linked together through the first opening part that is linked together at catalytic treatment device and sediment device and sets up the second drainage plate, the speed of whereabouts both can be cushioned to first drainage plate and second drainage plate avoids splashing everywhere, can play a separation effect to the solid catalyst that just falls into first settling zone and second settling zone again, and the second direct current board and the fourth direct current board of terminal perpendicular extension can be with solid catalyst drainage to the bottom of first settling zone and second settling zone, and the solid catalyst that has avoided settling is got off is driven by the processing solution that newly drops and is moved, shortens the settling time of catalyst.

[ description of the drawings ]

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained without inventive work, wherein:

fig. 1 is a schematic block diagram of a VOC photocatalytic treatment system provided by the present invention;

fig. 2 is a schematic view of a part of the structure connection of the VOC photocatalytic treatment system provided by the present invention;

fig. 3 is a schematic view of the structure of the ultraviolet lamp shown in fig. 2.

[ detailed description ] embodiments

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Referring to fig. 1 and 2, the present invention provides a VOC photocatalytic treatment system 100, which comprises a catalytic treatment device 1, a precipitation device 2, a pipeline 3, a catalyst regeneration device 4, a first flow guide plate 5 and a second flow guide plate 6. The catalytic treatment device 1 and the catalyst regeneration device 4 are arranged above the precipitation device 2 and are spaced from each other, and the pipeline 3 is used for connecting various components of the VOC photocatalytic treatment system 100.

The catalytic treatment device 1 treats the waste gas by using a photocatalytic degradation technology, and the principle is that free radicals with extremely strong activity are generated in a reaction system, and then the pollutants are completely degraded into inorganic matters through the processes of addition, substitution, electron transfer and the like between the free radicals and organic pollutants in the waste gas, and the inorganic matters are discharged after forming clean gas, so that the catalytic treatment device has a good pollution reduction effect.

The catalytic treatment device 1 includes a first housing 11 having an accommodating space, a first nozzle 12 accommodated in the first housing 11, and a catalytic light source 13 accommodated in the first housing 11 and spaced apart from the first nozzle 12.

The first casing 11 is a hollow cylindrical structure, the top of the first casing is provided with an air inlet 111, waste gas to be treated enters the accommodating space from the air inlet 111 to complete catalytic degradation, and the bottom of the first casing is provided with a first opening 112 communicated with the precipitation device 2.

The top of the first casing 11 is provided with an air inlet 111, the bottom thereof is provided with a first opening 112, and the waste gas to be treated enters the accommodating space through the air inlet 111 to complete catalytic degradation.

The first nozzle 12 is used for spraying a treatment liquid, the treatment liquid contains a catalyst, and preferably, the catalyst is TiO₂It has the advantages of high activity, high stability, low cost, no toxicity, etc. The setting direction of the first nozzle 12 is opposite to the air flow movement direction, that is, the first nozzle 12 is arranged towards the air inlet 111, the treatment liquid sprayed out from the first nozzle 12 is upwards sprayed out in a spiral shape at a high speed and is directly contacted with the exhaust gas reversely entering the first shell 11, when the two-phase momentum reaches a balance, a section of standing wave area which is formed by foam and highly turbulent is formed, the contact area of the two phases of air and liquid in the standing wave area is large, the update frequency is high, and extremely high mass transfer efficiency and degradation effect can be obtained.

Furthermore, the treatment liquid sprayed out from the first nozzle 12 moves along the direction toward the gas inlet 111, and then descends under the action of gravity to form two sections of movement paths, so that the contact time of the catalyst and the waste gas can be prolonged, and the degradation effect can be enhanced.

Furthermore, the number of the first nozzles 12 is two, the two first nozzles 12 are spaced from each other, and the sum of the lifts of the two first nozzles 12 is equal to the height of the first shell 11 by adjusting the spraying force and the distance of the first nozzles 12, so that the treatment liquid is uniformly distributed in the accommodating space, the contact area between the waste gas and the treatment liquid is increased, and the degradation effect is further enhanced. In other embodiments, the number of the first nozzles 12 may be any other number, which is not limited by the present invention.

The catalytic light source 13 provides a light source for catalytic degradation reaction, and is fixedly connected with the first shell 11. Specifically, the catalytic light source 13 includes an ultraviolet lamp 131 and a power source 132 connected to the ultraviolet lamp 131, the ultraviolet lamp 131 is fixed to the inner wall of the first casing 11, and the power source 132 is disposed on the outer wall of the first casing 11. Further, the number of the catalytic light sources 13 is plural, the ultraviolet light sources 13 are spaced from each other, and the number of the catalytic light sources 13 can be adjusted according to the intensity of light required for the catalytic degradation reaction.

Referring to fig. 3, the ultraviolet lamp 131 includes a plurality of lamps 1311 and a transparent cover 1312 covering the lamps 1311, and the lamps 1311 are distributed in a ring array along a central axis of the first housing 11, which may ensure uniform distribution of light intensity in the accommodating space; the lamp cover 1312 plays a role in waterproofing, prevents the lamp tube 1312 from contacting the treatment liquid, and prolongs the service life of the lamp tube 1312.

The settling device 2 is a square or round box-shaped structure, and comprises a top wall 21, a bottom wall 22 arranged opposite to the top wall 21, a side wall 23 connecting the top wall 21 and the bottom wall 22, and two partition plates 24 fixed on the bottom wall 22 and spaced from each other. The catalytic treatment apparatus 1 and the catalyst regeneration apparatus 4 are mounted on the ceiling wall 21, and the height of the partition plate 24 is smaller than the height of the side wall 23.

The top wall 21, the bottom wall 22 and the side wall 23 cooperate to form an accommodating space, the partition plate 24 partitions the accommodating space to form a first settling zone 10, a clarifying zone 20 and a second settling zone 30 which are communicated with each other, the first settling zone 10 is located below the catalytic treatment device 1, the second settling zone 30 is located below the catalyst regeneration device 4, and the clarifying zone 20 is located between the first settling zone 10 and the second settling zone 20. Preferably, the volume of the first settling zone 10 and the second settling zone 30 is larger than that of the clarification zone 20, and under the condition that the volume of the settling device 2 is fixed, the first settling zone 10 and the second settling zone 30 are ensured to have enough space, which is beneficial to accelerating the clarification speed of the liquid phase.

It can be understood that after the catalytic decomposition reaction is completed, the catalyst surface in the treatment solution may be attached with particulate impurities in the exhaust gas or insoluble substances generated after the degradation reaction, the activity is reduced, the contaminated catalyst is formed, and falls down with the treatment solution, enters the first settling zone 10 from the first opening 112 for settling, and after the contaminated catalyst is accumulated to a certain extent, the liquid level in the first settling zone 10 rises, and the supernatant in the first settling zone 10 overflows the partition plate 24 and enters the clarification zone 20.

A first liquid outlet hole 231 is formed in the position, corresponding to the first settling zone 10, of the side wall 23; a second liquid outlet 232 is arranged at the position corresponding to the clarification zone 20; a third liquid outlet hole 233 is formed at a position corresponding to the second settling zone 30, and the first liquid outlet hole 231, the second liquid outlet hole 232 and the third liquid outlet hole 233 are all arranged at the bottom of the side wall 23.

The pipeline 3 comprises a first pipeline 31 communicated with the first liquid outlet 231 and the catalyst regeneration device 4, a second pipeline 32 communicated with the second liquid outlet 232 and the catalytic treatment device 1, a third pipeline 33 communicated with the second liquid outlet 232 and the catalyst regeneration device 4, and a fourth pipeline 34 communicated with the third liquid outlet 233 and the catalytic treatment device 1.

The first pipeline 31 is used for conveying the contaminated catalyst in the first precipitation zone 10 to the catalyst regeneration device 4 for secondary purification of exhaust gas and cyclic regeneration; the second pipeline 32 is used for conveying the clear liquid in the clarification zone 20 to the catalytic treatment device 1 and forming a treatment liquid with the catalyst, the third pipeline 33 is used for conveying the clear liquid in the clarification zone 20 to the catalyst regeneration device 4 to wash the regenerated catalyst, and the fourth pipeline 34 is used for conveying the catalyst in the second precipitation zone 30 to the catalytic treatment device 1 again. It will be appreciated that the second and

fourth lines

32, 34 are connected to the first nozzle 12.

It should be noted that, the first pipeline 31, the second pipeline 32 and the third pipeline 33 and the fourth pipeline 34 are correspondingly required to be provided with a valve, a pump body or other matched components, and the conventional means in the field is selected, which is not described herein in detail.

The catalyst regeneration device 4 can perform secondary treatment on the exhaust gas, and can also perform treatment on the polluted catalyst to recover the activity of the polluted catalyst, so that the cyclic utilization of the catalyst is realized. Specifically, the catalyst regeneration device 4 includes a second casing 41, a defogging layer 42 housed in the second casing 41, a second nozzle 43, a filler layer 44, a mechanical baffle 45, and a microwave device 46 annularly disposed around the filler layer 44, where the defogging layer 42, the second nozzle 43, the filler layer 44, and the mechanical baffle 45 are sequentially disposed at intervals from top to bottom.

The second casing 41 is a hollow cylindrical structure, the top of which is provided with an air outlet 411, the treated clean air is discharged from the air outlet 411, and the bottom of which is provided with a second opening 412 communicated with the sedimentation device 2.

The defogging layer 42 is used for absorbing moisture or fine particulate matters in the clean gas, and may further ensure the cleanliness of the exhaust gas, and specifically, the defogging layer 32 is disposed at one end of the second housing 41 close to the air outlet 411 and fixed on the inner wall of the second housing 41.

The second nozzle 43 is connected with the first pipeline 31 and the third pipeline 33, valves for controlling the pipeline to be switched on and off are respectively arranged on the first pipeline 31 and the third pipeline 33, when the first pipeline 31 is switched on, the second nozzle 43 sprays the polluted catalyst in a mud slurry state on the packing layer 44, after the catalyst on the packing layer 44 reaches a certain thickness, the first pipeline 31 is closed, after the polluted catalyst is regenerated, the third pipeline 33 is opened, and the second nozzle 43 sprays clear liquid to wash the catalyst and drop the catalyst to the second settling zone 30. The second nozzles 43 are arranged in a direction opposite to the direction of movement of the gas flow, i.e. the second nozzles 43 are arranged in a direction towards the settling device 2.

The packing layer 44 is used for supporting the contaminated catalyst and providing a reaction site for the regeneration of the contaminated catalyst, and specifically, the packing layer 44 is made of a loose material and can allow liquid to pass through, so as to leave the contaminated catalyst. The packing layer 44 is provided in a plurality, and the packing layers 44 are spaced from each other, so that the probability of the contaminated catalyst adhering to the packing layer can be increased.

The microwave device 46 is fixedly connected to the second housing 41, and is configured to perform microwave treatment on the contaminated catalyst attached to the packing layer 44 to recover the activity of the catalyst. Further, the thickness of the packing layer 44 is matched with the microwave frequency band of the microwave device 46, and the thickness of the packing layer 44 is set to a thickness through which microwaves can penetrate.

The microwave devices 46 include a waveguide 461 connected to the filler layer 44 and microwave sources 462 connected to the waveguide 461, the waveguide 461 is sandwiched between the second housing 41 and the filler layer 44, and the microwave sources 462 are fixed to the outer wall of the second housing 41, it can be understood that the number of the microwave devices 46 corresponds to the number of the filler layers 44, that is, one filler layer corresponds to one microwave device 46.

The mechanical baffle 45 is arranged at one end of the second shell 41 close to the settling device 2, the catalyst subjected to microwave regeneration treatment is washed by the clear liquid sprayed by the second nozzle 43 and falls onto the mechanical baffle 45, after a certain amount of catalyst is accumulated, the mechanical baffle 45 is opened, the catalyst falls into the second settling zone 30 for settling, and after the liquid level in the second settling zone 30 rises, the clear liquid on the upper layer of the second settling zone 30 can also flow over the partition plate to enter the settling zone 20. Mechanical baffle 45 still includes rather than assorted induction mechanism, control mechanism and actuating mechanism, it adopt in this field conventional technical means can, the utility model discloses do not describe to this repeatedly.

The first opening 112 is disposed opposite to the first settling zone 10, and the second opening 412 is disposed opposite to the second settling zone 30.

The first flow-guiding plate 5 is disposed on a side of the first opening 112 away from the second opening 412, and includes a first straight flow plate 51 fixed to a side edge of the first opening 112 and extending vertically toward the first settling zone 10, a first inclined plate 52 extending obliquely from an end of the first straight flow plate 51 toward a central axis of the first opening 112, and a second straight flow plate 53 extending vertically from an end of the first inclined plate 52 toward a bottom of the first settling zone 10. The first drainage plate 5 is used for guiding drainage and buffering the falling speed of the treatment liquid to prevent the treatment liquid from splashing around, the first inclined plate 52 is additionally arranged between the first straight flow plate 51 and the second straight flow plate 53, so that the solid catalyst which just falls into the first settling zone 10 can be separated, the second straight flow plate 53 which extends vertically can guide the treatment liquid to the bottom of the first settling zone 10, the settled solid catalyst is prevented from being driven by the newly falling treatment liquid to move, and the settling time of the catalyst is shortened. Preferably, the first inclined plate 52 has an inclination angle of 30 to 45 ° with respect to the horizontal direction. Preferably, the orthographic projection of the first inclined plate 52 on the partition plate 24 extends beyond the partition plate 24.

The second flow guiding plate 6 is disposed on a side of the second opening 412 away from the first opening 112, and includes a third straight flow plate 61 fixed to a side edge of the second opening 412 and extending vertically toward the second settling zone 30, a second inclined plate 62 extending obliquely from an end of the third straight flow plate 61 toward a central axis near the second opening 412, and a fourth straight flow plate 63 extending vertically from an end of the second inclined plate 62 toward a bottom of the second settling zone 30. The first drainage plate 6 is used for guiding the drainage and buffering the falling speed of the catalyst, so that the catalyst is prevented from splashing everywhere, the second inclined plate 62 is additionally arranged between the third straight flow plate 61 and the fourth straight flow plate 63, the solid catalyst which just falls into the second settling zone 30 can be separated, the vertically extending fourth straight flow plate 63 can guide the catalyst to the bottom of the second settling zone 30, the settled solid catalyst is prevented from being driven by the newly falling catalyst to move, and the settling time of the catalyst is shortened. Preferably, the second inclined plate 62 has an inclination angle of 30 to 45 ° with respect to the horizontal direction. More preferably, the orthographic projection of the second inclined plate 62 on the partition plate 24 is beyond the partition plate 24.

Preferably, the first and second flow guide plates 5, 6 are symmetrically disposed about the fining zone 20.

Further, a clear liquid circulating port 234 is further formed in the side wall 23 at a position corresponding to the first settling zone 10, and the height of the clear liquid circulating port 234 is slightly lower than the height of the partition plate 24. The clear liquid circulation port 234 may be connected to the catalytic treatment apparatus 1 and the catalyst regeneration apparatus 4 through a pipeline, and when the clear liquid in the clarification zone 20 is insufficient, the clear liquid may be drawn from the clear liquid circulation port 234 to supplement the shortage.

The above embodiments of the present invention are only described, and it should be noted that, for those skilled in the art, modifications can be made without departing from the inventive concept, but these all fall into the protection scope of the present invention.

Claims

1. A VOC photocatalytic treatment system comprises a catalytic treatment device, a precipitation device and a catalyst regeneration device, wherein the catalytic treatment device and the catalyst regeneration device are arranged above the precipitation device and are mutually spaced, the precipitation device is divided into a first precipitation area positioned below the catalytic treatment device, a second precipitation area positioned below the catalyst regeneration device and a clarification area positioned between the first precipitation area and the second precipitation area, the first precipitation area is connected with the catalyst regeneration device through a pipeline, the clarification area is respectively connected with the catalytic treatment device and the catalyst regeneration device through a pipeline, the second precipitation area is connected with the catalytic treatment device through a pipeline, a first opening communicated with the precipitation device is arranged at the bottom of the catalytic treatment device, and the first opening is right opposite to the first precipitation area, the VOC photocatalytic treatment system is characterized in that the VOC photocatalytic treatment system further comprises a first flow guide plate and a second flow guide plate, wherein the first flow guide plate is arranged on one side of the first opening, which is far away from the second opening, the second flow guide plate is arranged on one side of the second opening, which is far away from the first opening, the first flow guide plate comprises a first straight flow plate, a first inclined plate and a second straight flow plate, the first straight flow plate is fixed on one side edge of the first opening, the first straight flow plate extends vertically from the tail end of the first straight flow plate to the direction close to the central axis of the first opening, the second inclined plate extends vertically from the tail end of the first inclined plate to the bottom of the first settling zone, the second flow guide plate comprises a second straight flow plate, which is fixed on one side edge of the second opening and extends vertically to the second settling zone The third straight flow plate, the second inclined plate which extends from the end of the third straight flow plate to the direction close to the central axis of the second opening in an inclined manner, and the fourth straight flow plate which extends from the end of the second inclined plate to the bottom of the second settling zone in a vertical manner.

2. The VOC photocatalytic treatment system according to claim 1, wherein the first and second flow-directing plates are symmetrically disposed about the fining zone.

3. The VOC photocatalytic treatment system according to claim 1, wherein the volumes of both the first and second settling zones are greater than the volume of the clarification zone.

4. The photocatalytic VOC treatment system according to claim 1 or 2, wherein the settling device comprises a top wall, a bottom wall disposed opposite to the top wall, a side wall connecting the top wall and the bottom wall, and two partition plates fixed to the bottom wall and spaced apart from each other, the top wall, the bottom wall, and the side wall cooperate to form a containing space, the height of the partition plates is smaller than that of the side wall, the two partition plates partition the containing space to form the first settling zone, the clarifying zone, and the second settling zone, and the catalytic treatment device and the catalyst regeneration device are mounted on the top wall.

5. The VOC photocatalytic treatment system of claim 4, wherein the orthographic projection of said first inclined plate on said partition exceeds said partition, and the orthographic projection of said second inclined plate on said partition exceeds said partition.

6. The VOC photocatalytic treatment system of claim 4, wherein a first liquid outlet hole is formed in a position of the sidewall corresponding to the first settling zone, a second liquid outlet hole is formed in a position corresponding to the settling zone, a third liquid outlet hole is formed in a position corresponding to the second settling zone, the first liquid outlet hole, the second liquid outlet hole and the third liquid outlet hole are all arranged at the bottom of the sidewall, the first liquid outlet hole is connected with the catalyst regeneration device through a pipeline, the second liquid outlet hole is respectively connected with the catalytic treatment device and the catalyst regeneration device through a pipeline, and the third liquid outlet hole is connected with the catalytic treatment device through a pipeline.

7. The VOC photocatalytic treatment system of claim 6, wherein a clear liquid circulation port is further opened on the side wall corresponding to the first settling zone, and the height of the clear liquid circulation port is slightly lower than the height of the partition plate.

8. The photocatalytic VOC treatment system according to claim 6, wherein said catalytic treatment device comprises a first housing having an air inlet, a first nozzle housed in said first housing, and a catalytic light source spaced from said first nozzle, wherein exhaust gas enters from said air inlet, said first nozzle is communicated with said second and third outlet holes through a pipe for spraying a treatment liquid, and said treatment liquid comprises a catalyst.

9. The photocatalytic VOC treatment system according to claim 8 wherein the first nozzle is disposed in a direction opposite to the direction of gas movement and the catalyst is TiO₂。

10. The photocatalytic VOC treatment system according to claim 6 wherein said catalyst regeneration device comprises a second housing having an air outlet, a second nozzle housed in said second housing, a packing layer disposed under said second nozzle, a microwave device disposed around said packing layer, a defogging layer secured to one end of said second housing near said air outlet, and a mechanical baffle secured to one end of said second housing near said precipitation device, said second nozzle and said packing layer being disposed between said defogging layer and said mechanical baffle, wherein said treated air is exhausted from said air outlet, said second nozzle is in communication with said first outlet via a conduit, and said second nozzle is oriented in a direction opposite to the direction of movement of the air.