CN110052161A - VOC photocatalysis treatment system - Google Patents

Abstract

The invention provides a VOC photocatalytic treatment system. The VOC photocatalytic treatment system includes a catalytic treatment device, a precipitation device, a pipeline, a mixing device and a circulation device. The precipitation device includes a first precipitation zone located below the catalytic treatment device, and a first precipitation zone located below the circulation device. A second precipitation zone and a clarification zone located between the first precipitation zone and the second precipitation zone, the pipelines include a first pipeline, a second pipeline, a third pipeline and a fourth pipeline, all of which The first pipeline communicates with the first precipitation zone and the mixing device, the second pipeline communicates with the clarification zone and the mixing device, and the third pipeline communicates with the mixing device and the circulation device , the fourth pipeline communicates with the second precipitation zone and the catalytic treatment device. Compared with the related art, the VOC photocatalytic treatment system provided by the present invention can realize the recycling of the catalyst.

Description

VOC photocatalytic treatment system

【Technical field】

The invention relates to the technical field of organic waste gas treatment, in particular to a VOC photocatalytic treatment system.

【Background technique】

In industrial production, especially in the printing industry, the waste gas generated in the production process includes a large amount of volatile organic compounds (VOC), which are emitted through the surface of the printing material and are discharged to the outside of the workshop through the pipeline without any treatment, causing pollution to the atmosphere. serious pollution of the environment.

In the related art, organic waste gas treatment is generally selected from activated carbon adsorption, solution absorption recovery method, condensation recovery method, combustion oxidation method, etc., but in the treatment process of the above method, a large amount of raw materials need to be consumed, and the demand for low energy consumption cannot be met.

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

[Content of the invention]

The purpose of the present invention is to provide a VOC photocatalytic treatment system that saves resources and has a good purification effect at the same time.

The invention provides a VOC photocatalytic treatment system, comprising a catalytic treatment device, a precipitation device, a pipeline, a mixing device and a circulation device. Exhaust gas enters from the catalytic treatment device and is discharged from the circulation device. The catalytic treatment device and The circulation device is installed above the precipitation device and is spaced apart from each other, and the precipitation device is divided into a first precipitation zone located below the catalytic treatment device, a second precipitation zone located below the circulation device, and a second precipitation zone located below the circulation device. The clarification zone between the first precipitation zone and the second precipitation zone, the pipeline includes a first pipeline, a second pipeline, a third pipeline and a fourth pipeline, and the first pipeline communicates with The first precipitation zone and the mixing device, the second pipeline is connected to the clarifying zone and the mixing device, the third pipe is connected to the mixing device and the circulation device, and the fourth pipe A road connects the second precipitation zone and the catalytic treatment device, the clarification zone is divided into a first primary clarification zone, a second primary clarification zone and a secondary clarification zone, the first primary clarification zone and the second primary clarification zone are separated. A precipitation zone is communicated, the second primary clarification zone is communicated with the second precipitation zone, the secondary clarification zone is located between the first primary clarification zone and the second primary clarification zone, and the secondary clarification zone is located between the first primary clarification zone and the second primary clarification zone. The height of the secondary clarification zone is lower than the height of the first primary clarification zone and the second primary clarification zone.

Preferably, the precipitation device includes a top wall, a bottom wall opposite to the top wall, and a side wall connecting the top wall and the bottom wall, the top wall, the bottom wall and the bottom wall. The side walls cooperate to form an accommodation space, and the catalytic treatment device and the circulation device are mounted on the top wall.

Preferably, the precipitation device further includes two partitions fixed on the bottom wall and spaced apart from each other, the height of the partitions is smaller than the height of the side walls, and the two partitions separate the accommodating space The first precipitation zone, the clarification zone and the second precipitation zone are formed by partitioning.

Preferably, the precipitation device further comprises two partition walls fixed on the bottom wall and spaced apart from each other, the height of the partition walls is less than the height of the partition plate, and the two partition walls separate the clarification zone The first primary clarification zone, the second primary clarification zone, and the secondary clarification zone are formed.

Preferably, two of the separators are respectively provided with through-holes, wherein one of the through-holes communicates with the first precipitation zone and the first primary clarification zone, and the other through-hole communicates with the second through-hole. A settling zone and the second primary clarification zone.

Preferably, the side wall is provided with a first liquid outlet hole corresponding to the position of the first precipitation zone; a second liquid outlet hole is provided in a position corresponding to the clarification zone; and a position corresponding to the second precipitation zone is provided with The third liquid outlet hole, the first liquid outlet hole, the second liquid outlet hole and the third liquid outlet hole are all set at the bottom of the side wall, the first pipeline and the first liquid outlet The second pipeline is connected with the second liquid outlet hole, and the fourth pipeline is connected with the third liquid outlet hole.

Preferably, the catalytic treatment device includes a first casing with an air inlet, a first nozzle accommodated in the first casing, and a catalytic light source arranged at intervals from the first nozzle, and the exhaust gas is discharged from the intake air. The first nozzle is connected to the fourth pipeline for spraying the treatment liquid, the treatment liquid includes a catalyst, the setting direction of the first nozzle is opposite to the movement direction of the gas, the catalyst is TiO2.

Preferably, the circulation device comprises a second casing with an air outlet, a second nozzle accommodated in the second casing, a packing layer disposed under the second nozzle, and a packing layer arranged around the packing layer In the microwave device, the processed gas is discharged from the gas outlet, the second nozzle is communicated with the third pipeline, and the direction of the second nozzle is opposite to the movement direction of the gas.

Preferably, the circulation device further comprises a defogging layer fixed on one end of the second casing close to the air outlet and a mechanical baffle fixed on one end of the second casing close to the precipitation device. The two nozzles and the filled layer are located between the demisting layer and the mechanical baffle.

Preferably, the number of the filler layers is three, the three filler layers are spaced apart from each other, and the number of the microwave devices matches the number of the filler layers.

Compared with the related art, the photocatalytic treatment device provided by the present invention removes the organic pollutants in the exhaust gas through catalytic degradation reaction, and transports the polluted catalyst after the catalytic reaction to the circulation device for microwave regeneration, and restores the activity of the catalyst. The catalyst is re-transported to the catalytic treatment device, which realizes the recycling of the catalyst, does not need to consume other raw materials, and saves resources.

【Description of drawings】

In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, under the premise of no creative work, other drawings can also be obtained from these drawings, wherein:

Fig. 1 is the structural block diagram of the VOC photocatalytic treatment system provided by the present invention;

Fig. 2 is the partial structure connection schematic diagram of the VOC photocatalytic treatment system provided by the present invention;

FIG. 3 is a schematic structural diagram of the ultraviolet lamp shown in FIG. 2 .

【Detailed ways】

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Referring to FIGS. 1 and 2 , the present invention provides a VOC photocatalytic treatment system 100 , including a catalytic treatment device 1 , a precipitation device 2 , a pipeline 3 , a mixing device 4 and a circulation device 5 . The catalytic treatment device 1 and the circulation device 5 are installed above the precipitation device 2 and spaced apart from each other, and the pipeline 4 is used for connection between the various components of the VOC photocatalytic device 100 .

The catalytic treatment device 1 uses the photocatalytic degradation technology to treat the exhaust gas. Transfer and other processes degrade all pollutants into inorganic substances, form clean gas and then discharge it, which has a good effect of reducing pollution.

The catalytic treatment device 1 includes a first casing 11 , a first nozzle 12 accommodated in the first casing 11 , and a catalyst accommodated in the first casing 11 and spaced from the first nozzle 12 . Light source 13 .

The first shell 11 is a hollow cylindrical structure, which includes a body portion 111 that encloses a receiving space, and a first housing portion 111 extending from the end of the body portion 111 close to the precipitation device 2 to the interior space of the precipitation device 2 . The straight flow baffle 112 and the first diagonal flow baffle 113 bent and extended from the end of the first straight flow baffle 112 . The body portion 111 is fixedly mounted on the sedimentation device 2 , and the first diagonal flow baffle 113 is inclined along the direction toward the central axis of the body portion 111 . Preferably, the inclination angle of the first diagonal flow baffle 113 relative to the horizontal direction is 30° to 45°.

An air inlet 1110 is opened at one end of the body portion 111 away from the precipitation device 2 , and the exhaust gas to be treated enters the accommodation space through the air inlet 1110 to complete catalytic degradation.

The first nozzle 12 is used for spraying the treatment liquid, and the treatment liquid contains a catalyst, preferably, the catalyst is TiO ₂ , which has the advantages of high activity, high stability, low cost, and non-toxicity. The disposition direction of the first nozzles 12 is opposite to the direction of gas movement, that is, the first nozzles 12 are disposed in the direction of the air inlet 1110 , and the treatment liquid sprayed from the first nozzles 12 is sprayed upward at a high speed in a spiral shape. , in direct contact with the exhaust gas entering the first shell 11 in the reverse direction, when the momentum of the two phases reaches equilibrium, a standing wave region composed of foam and highly turbulent will be formed, and the gas-liquid two-phase contact in the standing wave region With large area and high update frequency, extremely high mass transfer efficiency and degradation effect can be obtained.

Further, the treatment liquid sprayed from the first nozzle 12 first moves in the direction toward the air inlet 1110, and then descends under the action of gravity to form two moving paths, which can increase the contact time between the catalyst and the exhaust gas, and enhance the degradation effect. It can be understood that the first diagonal flow baffle 113 is used for guiding, and can buffer the speed of the treatment liquid when it falls, so as to prevent the treatment liquid from splashing around.

Furthermore, the number of the first nozzles 12 is two, and the two first nozzles 12 are spaced apart from each other. The sum of the lifts of 12 is equal to the height of the main body 111 , which can make the treatment liquid evenly distributed in the accommodation space, increase the contact area between the exhaust gas and the treatment liquid, and further enhance the degradation effect. In other embodiments, the number of the first nozzles 12 may also be any other number, which is not limited in the present invention.

The catalytic light source 13 provides a light source for catalytic degradation reaction, and is fixedly connected with the main body portion 111 . 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 on the inner wall of the main body portion 111 , and the power source 132 is disposed in the main body portion 111 the outer wall. Further, the number of the catalytic light sources 13 is multiple, and the plurality of the ultraviolet light sources 13 are spaced apart from each other. The number of the catalytic light sources 13 can be adjusted according to the light intensity required for the catalytic degradation reaction.

Referring to FIG. 3 , the ultraviolet lamp 131 includes a plurality of lamp tubes 1311 and a transparent lampshade 1312 covering the lamp tubes 1311 , and the plurality of the lamp tubes 1311 are distributed in an annular array along the central axis of the body portion 111 . It is possible to ensure uniform distribution of light intensity in the receiving space; the lampshade 1312 plays a waterproof role to avoid the contact between the lamp tube 1312 and the processing liquid, and increase the service life of the lamp tube 1312 .

The precipitation device 2 is a square or circular box-like structure, which includes a top wall 21, a bottom wall 22 opposite to the top wall 21, a side wall 23 connecting the top wall 21 and the bottom wall 22, and Two partitions 24 fixed to the bottom wall 22 and spaced apart from each other. The catalytic treatment device 1 and the circulation device 5 are installed on the top 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 a accommodating space, and the partition plate 24 separates the accommodating space to form the first precipitation zone 10 , the clarification zone 20 and the second precipitation zone which are connected to each other. Zone 30, the first precipitation zone 10 is located below the catalytic treatment device 1, the second precipitation zone 30 is located below the circulation device 5, and the clarification zone 20 is located in the first precipitation zone 10 and between the second precipitation zones 20 .

It can be understood that, after the catalytic decomposition reaction is completed, the surface of the catalyst in the treatment liquid will be attached with particulate impurities in the exhaust gas or insoluble substances generated after the degradation reaction, the activity will be reduced, and a polluted catalyst will be formed. The treatment liquid falls together and enters the first precipitation zone 10 for precipitation.

The side wall 23 is provided with a first liquid outlet hole 231 corresponding to the position of the first precipitation zone 10 ; a second liquid outlet hole 232 is formed corresponding to the position of the clarification zone 20 ; A third liquid outlet hole 233 is opened at the position. The first liquid outlet hole 231 , the second liquid outlet hole 232 and the third liquid outlet hole 233 are all disposed at the bottom of the side wall 23 .

The precipitation device 2 also includes two partition walls 25 fixed on the bottom wall 21 and spaced apart from each other, the height of the partition walls 25 is smaller than the height of the partition plate 24, and the two partition walls 25 separate the The clarification zone 20 is divided into a first primary clarification zone 201 , a second primary clarification zone 202 and a secondary clarification zone 203 .

The two partitions 24 are respectively provided with through holes 240 , wherein one of the through holes 240 communicates with the first precipitation zone 10 and the first primary clarification zone 201 , so that the first precipitation zone 10 is The liquid enters the first primary clarification zone 201, and the liquid level in the first primary clarification zone 201 rises until it overflows the partition wall 25 and enters the secondary clarification zone 203; another through hole 240 communicates with The second precipitation zone 30 and the second primary clarification zone 202 make the liquid in the second precipitation zone 20 enter the second primary clarification zone 202, and the liquid level in the second primary clarification zone 202 rises , until it enters the secondary clarification zone 203 through the partition wall 25 . It can be understood that due to the precipitation of the liquid in the first precipitation zone 10, the second precipitation zone 20, the first primary clarification zone 210 and the second primary clarification zone 202, the secondary The liquid in the clarification zone 203 is clean water with no impurities or with a low impurity content.

The pipeline 3 includes a first pipeline 31 connecting the first liquid outlet hole 231 and the mixing device 4 , a second pipeline 32 connecting the second liquid outlet hole 232 and the mixing device 4 , The third pipeline 33 connecting the mixing device 4 and the circulation device 5 and the fourth pipeline 34 connecting the third liquid outlet hole 233 and the catalytic treatment device 1 .

The first pipeline 31 is used to transport the polluted catalyst in the first precipitation zone 10 to the mixing device 4 ; the second pipeline 32 is used to transport the clean water in the secondary clarification zone 203 sent to the mixing device 4 . The mixing device 4 is used to mix the polluted catalyst and clean water evenly to form a mixed solution. The third pipeline 33 is used to transport the mixed solution to the circulation device 5 for cyclic regeneration. The four pipelines 34 are used to transport the catalyst in the second precipitation zone 30 to the catalytic treatment device 1 again. It can be understood that the fourth pipeline 34 is connected to the first nozzle 12 .

It should be noted that the first pipeline 31 , the second pipeline 32 , the third pipeline 33 and the fourth pipeline 34 also need to be provided with valves, pump bodies or other matching components. It is sufficient to select the conventional means in the field, which will not be described in detail in the present invention.

The circulation device 5 is used to treat the polluted catalyst, restore its activity, and realize the recycling of the catalyst. Specifically, the circulation device 5 includes a second casing 51 , a defogging layer 52 accommodated in the second casing 51 , a second nozzle 53 , a packing layer 54 , a mechanical baffle 55 , and a ring arranged in the second casing 51 . The microwave device 56 around the packing layer 54, the defogging layer 52, the second nozzle 53, the packing layer 54 and the mechanical baffle 55 are arranged at intervals from top to bottom.

The second shell 51 is a hollow cylindrical structure, which includes a main body portion 511 enclosing a storage space, and a second housing portion 511 extending from the end of the main body portion 511 close to the precipitation device 2 to the interior space of the precipitation device 2 . Two DC baffles 512 and a second diagonal flow baffle 513 bent and extended from the end of the second DC baffle 512 , the main body 511 is fixedly mounted on the precipitation device 2 and is connected with the main body 111 Spaced apart from each other, the second diagonal flow baffles 513 are inclined along the direction toward the central axis of the main body portion 511 .

An air outlet 5110 is opened at one end of the main body portion 511 away from the precipitation device 2 , and the treated clean gas is discharged from the air outlet 5110 .

The second nozzle 53 is connected to the third pipeline 33 for spraying the mixed liquid. The disposition direction of the second nozzle 53 is opposite to the direction of airflow movement, that is, the disposition direction of the second nozzle 52 is toward the precipitation device 2 .

The packing layer 54 is used to carry the polluted catalyst and provide a reaction site for the regeneration of the polluted catalyst. Specifically, the packing layer 54 is made of loose material, which can make the water in the mixed solution Pass, leaving behind the contaminated catalyst. The number of the packing layers 54 is multiple, and the multiple packing layers 54 are spaced apart from each other, which can increase the probability of the contaminated catalyst attaching.

The microwave device 56 is fixedly connected to the second casing 51, and is used for microwave treatment of the contaminated catalyst attached to the packing layer 54, so as to restore the activity of the catalyst. Further, the thickness of the filler layer 54 matches the microwave frequency band of the microwave device 56 , and the thickness of the filler layer 54 is set to a thickness that microwaves can penetrate.

The microwave device 56 includes a waveguide 561 connected to the filler layer 54 and a microwave source 562 connected to the waveguide 561. Between the packing layers 54, the microwave source 562 is fixed on the outer wall of the second housing 51. It can be understood that the number of the microwave devices 56 corresponds to the number of the packing layers 54, that is, one microwave device 56 corresponds to the number of the packing layers 54. The filler layer corresponds to one of the microwave devices 56 .

The mechanical baffle 55 is set at one end of the second shell 51 close to the precipitation device 2 , and the catalyst treated by microwave regeneration falls onto the mechanical baffle 55 , and after a certain amount of accumulation, the mechanical baffle The plate 55 is opened, and the catalyst falls into the second precipitation zone 30 for precipitation. After the water level in the second precipitation zone 30 rises, the clear water in the upper layer of the second precipitation zone 30 can also pass through the partition and enter the Clarification zone 20. The mechanical baffle 55 also includes a matching sensing mechanism, a control mechanism and a driving mechanism, which may be conventional technical means in the field, which will not be described in detail in the present invention. It can be understood that the second diagonal flow baffle 513 is used for guiding, and can buffer the speed of the catalyst when it falls, so as to prevent the liquid in the second precipitation zone 30 from splashing around.

The defogging layer 52 is used to absorb the moisture or fine particulate matter in the clean gas, which can further ensure the cleanliness of the exhaust gas. Specifically, the defogging layer 32 is disposed near the main body portion 511 One end of the air outlet 5110 is fixed to the inner wall of the body portion 511 .

Compared with the related art, the photocatalytic treatment device 100 provided by the present invention removes organic pollutants in the exhaust gas through catalytic degradation reaction, and transports the contaminated catalyst after the catalytic reaction to the circulation device 5 for microwave regeneration to restore activity. The latter catalyst is re-transported to the catalytic treatment device 1, realizing the recycling of the catalyst, without other raw materials being consumed, and saving resources.

The above are only the embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, improvements can be made without departing from the inventive concept of the present invention, but these belong to the present invention. scope of protection.

Claims (10)

1. a kind of VOC photocatalysis treatment system, which is characterized in that including device for catalytic treatment, settler, pipeline, mixing dress Set and circulator, exhaust gas enter from the device for catalytic treatment, be discharged by the circulator, the device for catalytic treatment and The circulator is installed on the top of the settler and is spaced apart from each other, and the settler, which is divided into, is located at described urge Change the first settling zone below processing unit, the second settling zone below the circulator and be located at described first and sinks Settling section between shallow lake area and second settling zone, the pipeline include the first pipeline, the second pipeline, third pipeline and the 4th Pipeline, the first settling zone and the mixing arrangement described in first pipeline connection, settling section described in second pipeline connection With the mixing arrangement, the third pipe is connected to the mixing arrangement and the circulator, described in the 4th pipeline connection Second settling zone and the device for catalytic treatment, the settling section are separated to form the first primary settling section, the second primary clarification Area and secondary clearing area, the first primary settling section be connected tos with first settling zone, the second primary settling section and Second settling zone connection, the secondary clearing area be located at the described first primary settling section and the second primary settling section it Between, and the height in the secondary clearing area is lower than the height of the described first primary settling section and the second primary settling section.

2. VOC photocatalysis treatment system according to claim 1, which is characterized in that the settler includes top Wall, the bottom wall being oppositely arranged with the roof and the side wall for connecting the roof and the bottom wall, the roof, the bottom wall And the side wall cooperatively forms accommodation space, the device for catalytic treatment and the circulator are installed on the roof.

3. VOC photocatalysis treatment system according to claim 2, which is characterized in that the settler further includes fixing In the bottom wall and two partitions of setting are spaced apart from each other, the height of the partition is less than the height of the side wall, described in two The accommodation space is separated to form first settling zone, the settling section and second settling zone by partition.

4. VOC photocatalysis treatment system according to claim 3, which is characterized in that the settler further includes fixing In the bottom wall and two partition walls being spaced apart from each other, the height of the partition wall is less than the height of the partition, described in two The settling section is separated to form the described first primary settling section, the second primary settling section and the secondary clearing by partition wall Area.

5. photocatalysis treatment system according to claim 4, which is characterized in that two partitions are respectively equipped with perforative Through-hole, one of them described through-hole are connected to first settling zone and the first primary settling section, another described through-hole connects Lead to second settling zone and the second primary settling section.

6. VOC photocatalysis treatment system according to claim 5, which is characterized in that it is heavy that the side wall corresponds to described first The position in shallow lake area offers the first fluid hole；The position in the corresponding secondary clearing area offers the second fluid hole；Described in correspondence The position of second settling zone offers third fluid hole, and first fluid hole, the second fluid hole and the third fluid hole are equal It is set to the sidewall bottom position, first pipeline is connect with first fluid hole, second pipeline and described the The connection of two fluid holes, the 4th pipeline are connect with the third fluid hole.

7. VOC photocatalysis treatment system according to claim 1, which is characterized in that the device for catalytic treatment includes tool Have the first shell of air inlet, be contained in the intracorporal first jet of the first shell and with the first jet is spaced urges Change light source, exhaust gas is entered by the air inlet, the first jet and the 4th pipeline connection, for spraying treatment fluid, institute State in treatment fluid includes catalyst, the setting direction of the first jet and the direction of motion of gas on the contrary, the catalyst is TiO₂。

8. VOC photocatalysis treatment system according to claim 1, which is characterized in that the circulator includes having The second shell of port, be contained in the intracorporal second nozzle of the second shell, the packing layer below the second nozzle with And be located on the microwave device around described filler layer, treated, and gas is discharged by the gas outlet, the second nozzle with The third pipeline connection, and the direction of the second nozzle is opposite with the direction of motion of gas.

9. VOC photocatalysis treatment system according to claim 8, which is characterized in that the circulator further includes fixing It close to the demisting layer of described gas outlet one end and is fixed on the second shell in the second shell and is filled close to the precipitating The mechanical shutter of one end is set, the second nozzle and institute's packing layer are between the demisting layer and the mechanical shutter.

10. VOC photocatalysis treatment system according to claim 8, which is characterized in that the quantity of described filler layer is three A, three described filler layers are spaced apart from each other, and the quantity of the microwave device and the quantity of described filler layer match.