CN212576010U

CN212576010U - Low-temperature plasma photocatalysis waste gas purifier

Info

Publication number: CN212576010U
Application number: CN202021167734.6U
Authority: CN
Inventors: 邹冬生
Original assignee: Shanghai Gold Environmental Technology Co ltd
Current assignee: Shanghai Gold Environmental Technology Co ltd
Priority date: 2020-06-22
Filing date: 2020-06-22
Publication date: 2021-02-23
Anticipated expiration: 2030-06-22

Abstract

The utility model relates to a photocatalysis clarifier technical field especially relates to a low temperature plasma photocatalysis exhaust gas purifier, include leading filter, first purification chamber, second in proper order and purify chamber and rearmounted filter, the second purify the air inlet end in chamber with the air-out end in first purification chamber is through the ventilation pipe connection, install the desicator on the ventilation pipe. The utility model solves the problems of low catalytic efficiency and catalyst inactivation caused by the combination of plasma and photocatalysis in the prior art; through designing first purification chamber and second purification chamber with plasma generator and photocatalysis separation, be provided with the desicator on the ventilation pipe that both are connected, the solid particle etc. of first purification chamber can be got rid of to the desicator to avoid solid particle to block up the catalyst and lead to the catalyst coking, finally avoid catalyst deactivation, improve photocatalysis's treatment effeciency.

Description

Low-temperature plasma photocatalysis waste gas purifier

Technical Field

The utility model relates to a photocatalysis clarifier technical field especially relates to a low temperature plasma photocatalysis exhaust gas purifier.

Background

In the industrial production process, industries such as chemical industry, synthetic leather, coating, printing, plastic cement, rubber, chemical fiber, shoe making, wood industry and the like generate a large amount of organic waste gas, and the toxicity of the organic waste gas in different industries is different.

The organic waste gas treatment refers to the treatment work of adsorbing, filtering and purifying the organic waste gas generated in the industrial production process. The organic waste gas treatment is generally carried out by an air purification treatment method of organic substances containing carbon, hydrogen and oxygen, such as formaldehyde organic waste gas treatment, benzene series organic waste gas treatment such as benzene toluene xylene, acetone butanone organic waste gas treatment, ethyl acetate waste gas treatment, oil mist organic waste gas treatment, furfural organic waste gas treatment, styrene and acrylic acid organic waste gas treatment, resin organic waste gas treatment, additive organic waste gas treatment, paint mist organic waste gas treatment, and Tianna water organic waste gas treatment.

The organic waste gas is generally characterized by flammability, explosiveness, toxicity, harm, insolubility in water, solubility in organic solvent and great treatment difficulty. In organic waste gas treatment, various principles such as an organic waste gas activated carbon adsorption treatment method, a catalytic combustion method, a catalytic oxidation method, an acid-base neutralization method, a plasma method and the like are generally adopted.

The activated carbon adsorption method is generally adopted in the initial stage: the waste gas is adsorbed by the activated carbon, when the adsorption is saturated, the activated carbon is desorbed and regenerated, the waste gas is blown off and then is catalytically combusted, the waste gas is converted into harmless substances, and the regenerated activated carbon is continuously used. When the activated carbon is regenerated for a certain number of times, the adsorption capacity is obviously reduced, and the activated carbon needs to be regenerated or updated.

The activated carbon is the most used method for treating the organic waste gas at present, has good adsorption performance on the benzene waste gas, but has poor adsorption performance on the hydrocarbon waste gas. The main disadvantage is that the operation cost is high, and the method is not suitable for the environment with high humidity. If the organic waste gas with high humidity needs to be treated, a nano micro-electrolysis oxidation process is adopted. The currently used adsorption type activated carbon is mainly used for tail gas adsorption and harmful gas adsorption, and most of the currently used adsorption type activated carbon is columnar activated carbon. In addition, the plasma method is generally recommended because the low-temperature plasma method has the characteristics of high removal efficiency and convenient use.

In the prior art, the photocatalytic purification technology mainly uses photocatalyst titanium dioxide to absorb light energy radiated from the outside, so that the light energy is directly converted into chemical energy. When the energy is greater than TiO₂When a semiconductor is irradiated with light having a forbidden bandwidth, an optically excited electron transits to a conduction band to form a conduction band electron (e)^-) While leaving a hole order (h) in the valence band⁺). Due to the discontinuity of the semiconductor energy band, electrons and holes have a long lifetime, and they can move under the action of an electric field or by diffusion, undergo redox reactions with substances adsorbed on the surface of the semiconductor catalyst particles, or are trapped by surface lattice defects. The hole and the electron can also be directly recombined in or on the catalyst particle, the hole can react with oxygen or water adsorbed on the surface of the catalyst particle to generate a hydroxyl radical (HO.), and the hydroxyl radical is a particle with high activity and can indiscriminately oxidize and mineralize a plurality of organic matters.

In the prior art, the plasma generator and the photocatalysis are used in a matching way, so that the types of the purifier are less, and the combination of the plasma generator and the photocatalysis has the problem of high energy consumption. Chinese patent CN201721797819.0 proposes a low-temperature plasma photocatalytic waste gas purification device, which comprises a purification tank, wherein two ends of the purification tank are respectively provided with an air inlet and an air outlet, the top of the purification tank near one end of the air inlet is provided with a low-temperature plasma generator, and the low-temperature plasma generator is provided with an air supply device for blowing plasma gas generated by the low-temperature plasma generator into the purification tank; an ultraviolet lamp group is arranged in the purification tank close to the low-temperature plasma generator, and a photocatalyst oxidation steel mesh is arranged between the ultraviolet lamp group and the low-temperature plasma generator; still be equipped with first spray set between photocatalyst oxidation steel mesh and the low temperature plasma generator, first spray set's the direction of spraying is towards photocatalyst oxidation steel mesh. Because the plasma spraying device is adjacent to the ultraviolet lamp bank, and a photocatalyst oxidation steel mesh is arranged between the ultraviolet lamp bank and the low-temperature plasma generator, the catalyst is blocked by solid particles to cause coking of the catalyst, and the phenomenon of catalyst deactivation is caused.

SUMMERY OF THE UTILITY MODEL

In view of the above shortcomings of the prior art, an object of the present invention is to provide a low temperature plasma photocatalytic waste gas purifier for solving the problems of low catalytic efficiency and catalyst deactivation caused by the combination of plasma and photocatalysis in the prior art. The utility model discloses a first purification chamber of design and second purify the chamber with plasma generator and photocatalysis separation, are provided with the desicator on the ventilation pipe that both are connected, and the desicator can detach the solid particle etc. in first purification chamber to avoid solid particle to block up the catalyst and lead to the catalyst coking, finally avoid the catalyst deactivation, improve photocatalysis's treatment effeciency.

In order to achieve the above objects and other related objects, the utility model provides a low temperature plasma photocatalysis exhaust gas purifier, low temperature plasma photocatalysis exhaust gas purifier includes:

the device comprises a front filter, a front filter and a back filter, wherein the front filter is provided with an air inlet;

the air purifier comprises a first purifying cavity, a plasma generator is arranged at the top of the first purifying cavity, the air outlet end of the plasma generator is connected with the first purifying cavity, and the air inlet end of the plasma generator is provided with an air supply device; the air inlet end of the first purification cavity is connected with the air outlet end of the pre-filter, and the air outlet end of the first purification cavity is provided with a spraying device;

the air inlet end of the second purification cavity is connected with the air outlet end of the first purification cavity through a ventilation pipe, and a dryer is installed on the ventilation pipe; at least two ultraviolet lamp groups are arranged in the second purification cavity, each ultraviolet lamp group comprises at least two ultraviolet lamps, and photocatalyst nets are arranged on two sides of each ultraviolet lamp;

the air inlet end of the rear filter is connected with the air outlet end of the second purification cavity, and the rear filter is provided with an air outlet.

The pre-filter can primarily filter most solid particle impurities, VOCs in the organic waste gas is subjected to a series of physical and chemical reactions in the first purification cavity, macromolecular pollutants can be converted into micromolecular safe substances, and meanwhile, toxic and harmful substances can be converted into non-toxic and harmless or low-toxicity and low-harm substances; and the substance generated after the reaction is sprayed by the spraying port, the rear part of the substance is mixed with water and enters the water tank, and the sprayed gas enters the second purification cavity after absorbing water vapor and solid particles by the dryer. The photocatalyst net in the second purifying cavity is provided with nanometer titanium dioxide which has a photocatalytic function and can generate a strong catalytic degradation function under the action of ultraviolet light to catalyze water or oxygen into hydroxyl free radicals (OH) and superoxide anion free radicals (O) with oxidation capacity₂HO) active oxygen (HO)₂And (c) and other photoproduction active groups with oxidation capacity, wherein the energy of the photoproduction active groups is equivalent to the high temperature of 3600K, and the photoproduction active groups have strong oxidation property, so that pollutants such as formaldehyde, benzene, toluene, xylene, ammonia, TVOC and the like can be effectively degraded, the photoproduction active groups have high-efficiency and wide disinfection performance, and can decompose and harmlessly treat toxins released by bacteria or fungi. The plasma generator is separated from the photocatalysis by designing the first purifying cavity and the second purifying cavity, the dryer is arranged on the ventilation pipe connected with the first purifying cavity and the second purifying cavity, and solid particles and the like in the first purifying cavity can be removed by the dryer, so that the photocatalyst coking caused by the blockage of the photocatalyst (nano-scale titanium dioxide) by the solid particles is avoided, the inactivation of the photocatalyst is finally avoided, and the treatment efficiency of the photocatalysis is improved. The content of organic pollutants in the gas passing through the first purifying cavity and the second purifying cavity reaches the standard, and the emission can be realized by removing odor through a rear filter.

In an embodiment of the present invention, the air inlet of the front filter is provided with a first filter screen, the air outlet end of the plasma generator is provided with a second filter screen, and the air outlet of the rear filter is provided with a third filter screen.

First filter screen can the prefilter most solid particle impurity, and during solid particle impurity got into plasma generator can be avoided to the second filter screen, during the third filter screen can avoid outside gas to get into low temperature plasma photocatalysis exhaust gas purifier.

In an embodiment of the present invention, the spraying device includes a spraying pipe, a spraying opening is provided on the spraying pipe, the spraying opening faces the air inlet end of the first purification chamber.

In an embodiment of the present invention, a water tank is disposed below the first purifying chamber, the bottom of the water tank is connected to the spray pipe, and a water pump is disposed in the water tank.

Realize the water circulation through basin and water pump, improve the utilization ratio of material.

In an embodiment of the present invention, the dryer and the ventilation pipe are detachably connected.

The dryer is more easily replaced by a detachable connection.

In an embodiment of the present invention, the dryer includes a first housing, the first housing is connected to the second housing by a screw thread, a cavity is disposed between the first housing and the second housing, a drying mesh bag is installed in the cavity, and a drying agent is filled in the drying mesh bag.

The dryer is in threaded connection with the second shell through the first shell, and therefore the drying agent can be replaced conveniently.

In an embodiment of the present invention, the photocatalyst net is a strip-shaped wave net. The strip-shaped wave net can improve the contact area, thereby improving the treatment efficiency.

In an embodiment of the utility model, low temperature plasma photocatalysis exhaust gas purifier still includes the chimney, the chimney with the air outlet is connected, centrifugal fan is installed to the bottom of chimney.

The high-altitude emission is safer by designing the chimney.

As above, the utility model discloses a low temperature plasma photocatalysis exhaust gas purifier has following beneficial effect: the pre-filter can primarily filter most solid particle impurities, and VOCs in the organic waste gas is in the first stageThrough a series of physical and chemical reactions in the purification cavity, macromolecular pollutants can be converted into micromolecular safe substances, and meanwhile, toxic and harmful substances can be converted into non-toxic and harmless or low-toxicity and low-harm substances; and the substance generated after the reaction is sprayed by the spraying port, the rear part of the substance is mixed with water and enters the water tank, and the sprayed gas enters the second purification cavity after absorbing water vapor and solid particles by the dryer. The photocatalyst net in the second purifying cavity is provided with nanometer titanium dioxide which has a photocatalytic function and can generate a strong catalytic degradation function under the action of ultraviolet light to catalyze water or oxygen into hydroxyl free radicals (OH) and superoxide anion free radicals (O) with oxidation capacity₂HO) active oxygen (HO)₂And (c) and other photoproduction active groups with oxidation capacity, wherein the energy of the photoproduction active groups is equivalent to the high temperature of 3600K, and the photoproduction active groups have strong oxidation property, so that pollutants such as formaldehyde, benzene, toluene, xylene, ammonia, TVOC and the like can be effectively degraded, the photoproduction active groups have high-efficiency and wide disinfection performance, and can decompose and harmlessly treat toxins released by bacteria or fungi. The plasma generator is separated from the photocatalysis by designing the first purifying cavity and the second purifying cavity, the dryer is arranged on the ventilation pipe connected with the first purifying cavity and the second purifying cavity, and solid particles and the like in the first purifying cavity can be removed by the dryer, so that the photocatalyst coking caused by the blockage of the photocatalyst (nano-scale titanium dioxide) by the solid particles is avoided, the inactivation of the photocatalyst is finally avoided, and the treatment efficiency of the photocatalysis is improved. The content of organic pollutants in the gas passing through the first purifying cavity and the second purifying cavity reaches the standard, and the emission can be realized by removing odor through a rear filter.

Drawings

Fig. 1 is a schematic view showing an overall structure of a low-temperature plasma photocatalytic exhaust gas purifier according to an embodiment of the present invention.

Fig. 2 is a schematic diagram of a plasma generator of a low-temperature plasma photocatalytic exhaust gas purifier according to an embodiment of the present invention.

Fig. 3 is a schematic view of a first purifying chamber of a low-temperature plasma photocatalytic waste gas purifier according to an embodiment of the present invention.

Fig. 4 is a schematic diagram illustrating an open state of a dryer of a low-temperature plasma photocatalytic exhaust gas purifier according to an embodiment of the present invention.

Fig. 5 is a schematic diagram illustrating a screwing state of a dryer of a low-temperature plasma photocatalytic exhaust gas purifier according to an embodiment of the present invention.

Fig. 6 is a schematic diagram of a pre-filter of a low-temperature plasma photocatalytic exhaust gas purifier according to an embodiment of the present invention.

Fig. 7 is a schematic diagram of a post-filter of a low-temperature plasma photocatalytic exhaust gas purifier according to an embodiment of the present invention.

Fig. 8 is a schematic diagram illustrating an open state of the second purifying chamber of the low-temperature plasma photocatalytic exhaust gas purifier according to an embodiment of the present invention.

Fig. 9 is a schematic view of an ultraviolet lamp set of a low-temperature plasma photocatalytic exhaust gas purifier according to an embodiment of the present invention.

Description of the element reference numerals

1-a pre-filter, 101-a first sieve; 2-air inlet; 3-a first purifying cavity, 301-a water tank, 302-a water pump; 4-plasma generator, 401-second screen; 5-an air supply device; 6-spraying device, 601-spraying port, 602-spraying pipe; 7-a second purification chamber; 8-a ventilation pipe; 9-dryer, 901-first shell, 902-second shell, 903-drying mesh bag; 10-ultraviolet lamp group, 1001-ultraviolet lamp, 1002-photocatalyst net; 11-post filter, 1101-third screen; 12-an air outlet; 13-a chimney; 14-centrifugal fan.

Detailed Description

The following description is provided for illustrative purposes, and other advantages and features of the present invention will become apparent to those skilled in the art from the following detailed description.

Please refer to fig. 1 to 9. It should be understood that the structure, ratio, size and the like shown in the drawings attached to the present specification are only used for matching with the content disclosed in the specification, so as to be known and read by those skilled in the art, and are not used for limiting the limit conditions that the present invention can be implemented, so that the present invention has no technical essential meaning, and any structure modification, ratio relationship change or size adjustment should still fall within the scope that the technical content disclosed in the present invention can cover without affecting the function that the present invention can produce and the purpose that the present invention can achieve. Meanwhile, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for convenience of description, and are not intended to limit the scope of the present invention, and changes or adjustments of the relative relationship thereof may be made without substantial technical changes, and the present invention is also regarded as the scope of the present invention.

Referring to fig. 1, the present invention provides a low temperature plasma photocatalytic exhaust gas purifier, including:

referring to fig. 1, a pre-filter 1, wherein an air inlet 2 is arranged on the pre-filter 1;

referring to fig. 2 and 3, a first purifying cavity 3 is provided, a plasma generator 4 is installed at the top of the first purifying cavity 3, an air outlet end of the plasma generator 4 is connected with the first purifying cavity 3, and an air inlet end of the plasma generator 4 is provided with an air supply device 5; the air inlet end of the first purification cavity 3 is connected with the air outlet end of the pre-filter 1, and the air outlet end of the first purification cavity 3 is provided with a spraying device 6; referring to fig. 3, the spraying device 6 includes a spraying pipe 602, a spraying port 601 is disposed on the spraying pipe 602, and the spraying port 601 faces an air inlet end of the first purifying chamber 3; a water tank 301 is arranged below the first purification cavity 3, the bottom of the water tank 301 is connected with a spray pipe 602, and a water pump 302 is arranged in the water tank 301;

referring to fig. 8, in a second purification chamber 7, an air inlet end of the second purification chamber 7 is connected with an air outlet end of the first purification chamber 3 through a ventilation pipe 8, and a dryer 9 is detachably connected to the ventilation pipe 8; referring to fig. 4 and 5, the dryer 9 includes a first casing 901, the first casing 901 is in threaded connection with a second casing 902, a cavity is disposed between the first casing 901 and the second casing 902, a drying mesh bag 903 is installed in the cavity, and a drying agent is filled in the drying mesh bag 903; referring to fig. 8, at least two ultraviolet lamp sets 10 are disposed in the second purification chamber 7, referring to fig. 9, the ultraviolet lamp sets 10 include at least two ultraviolet lamps 1001, and strip-shaped wave-shaped photocatalyst nets 1002 are disposed on both sides of the ultraviolet lamps 1001;

referring to fig. 1, a rear filter 11, an air inlet end of the rear filter 11 is connected to an air outlet end of the second purifying chamber 7, and an air outlet 12 is disposed on the rear filter 11;

referring to fig. 1, a chimney 13, wherein the chimney 13 is connected to the air outlet 12, and a centrifugal fan 14 is installed at the bottom of the chimney 13;

referring to fig. 6, the air inlet 2 of the pre-filter 1 is provided with a first filter screen 101; referring to fig. 2, a second filter 401 is disposed at the air outlet end of the plasma generator 4; referring to fig. 7, the air outlet 12 of the post-filter 11 is provided with a third filter screen 1101.

The working process is as follows: the pre-filter 1 can primarily filter most solid particle impurities, VOCs in organic waste gas is subjected to a series of physical and chemical reactions in the first purification cavity 3, substances generated after the reactions are sprayed by the spraying port 601, the sprayed substances are mixed with water to enter the water tank 301, and the sprayed gas enters the second purification cavity 7 after absorbing water vapor and solid particles through the dryer 9. The photocatalyst net 1002 in the second purifying cavity 7 is provided with nanometer titanium dioxide, the gas is catalyzed and decomposed by the nanometer titanium dioxide, so that the content of organic pollutants in the gas reaches the standard, the gas is deodorized by the post-filter 11, and the centrifugal fan 14 provides power to discharge the gas from the chimney 13.

The working principle is as follows: VOCs in the organic waste gas are subjected to a series of physical and chemical reactions in the first purification cavity 3, macromolecular pollutants can be converted into micromolecular safe substances, meanwhile, toxic and harmful substances can be converted into non-toxic, harmless or low-toxic and low-harmful substances, and the substances generated after the reactions are sprayed by the spraying openings 601, and then are mixed with water to enter the water tank 301. The photocatalyst net 1002 in the second purifying cavity 7 is provided with nanometer titanium dioxide which has a photocatalytic function and can generate a strong catalytic degradation function under the action of ultraviolet light to catalyze water or oxygen into oxygenOH, a hydroxyl radical capable of being converted and O, a superoxide anion radical₂Active oxygen namely HO₂And the photogenerated active groups with oxidation capacity have energy equivalent to high temperature of 3600K and strong oxidation, thereby being capable of effectively degrading pollutants such as formaldehyde, benzene, toluene, xylene, ammonia, TVOC and the like, having high-efficiency and wide-range disinfection performance and being capable of decomposing and harmlessly treating toxins released by bacteria or fungi.

To sum up, the utility model discloses a first purification chamber 3 of design and second purify chamber 7 with plasma generator 4 and photocatalysis separation, be provided with desicator 9 on ventilation pipe 8 that both are connected, the solid particle etc. of first purification chamber 3 can be detached to desicator 9 to avoid solid particle to block up the catalyst and lead to the catalyst coking, finally avoid the catalyst deactivation, improve photocatalysis's treatment effeciency. Therefore, the utility model effectively overcomes various defects in the prior art and has high industrial utilization value.

The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims

1. The utility model provides a low temperature plasma photocatalysis exhaust gas purifier which characterized in that, low temperature plasma photocatalysis exhaust gas purifier includes: the device comprises a front filter (1), wherein an air inlet (2) is formed in the front filter (1);

the air purifier comprises a first purification cavity (3), wherein a plasma generator (4) is installed at the top of the first purification cavity (3), the air outlet end of the plasma generator (4) is connected with the first purification cavity (3), and the air inlet end of the plasma generator (4) is provided with an air supply device (5); the air inlet end of the first purification cavity (3) is connected with the air outlet end of the pre-filter (1), and the air outlet end of the first purification cavity (3) is provided with a spraying device (6);

the air inlet end of the second purification cavity (7) is connected with the air outlet end of the first purification cavity (3) through a ventilation pipe (8), and a dryer (9) is installed on the ventilation pipe (8); at least two ultraviolet lamp sets (10) are arranged in the second purification cavity (7), each ultraviolet lamp set (10) comprises at least two ultraviolet lamps (1001), and photocatalyst nets (1002) are mounted on two sides of each ultraviolet lamp (1001);

the air purifier comprises a rear filter (11), wherein the air inlet end of the rear filter (11) is connected with the air outlet end of the second purification cavity (7), and an air outlet (12) is formed in the rear filter (11).

2. The low-temperature plasma photocatalytic exhaust gas purifier according to claim 1, characterized in that: the air inlet (2) of the front filter (1) is provided with a first filter screen (101), the air outlet end of the plasma generator (4) is provided with a second filter screen (401), and the air outlet (12) of the rear filter (11) is provided with a third filter screen (1101).

3. The low-temperature plasma photocatalytic exhaust gas purifier according to claim 1, characterized in that: spray set (6) are including shower (602), be provided with on shower (602) and spray mouth (601), spray mouth (601) orientation the air inlet end in first purification chamber (3).

4. A low temperature plasma photocatalytic exhaust gas purifier as recited in claim 3, wherein: a water tank (301) is arranged below the first purification cavity (3), the bottom of the water tank (301) is connected with a spray pipe (602), and a water pump (302) is arranged in the water tank (301).

5. The low-temperature plasma photocatalytic exhaust gas purifier according to claim 1, characterized in that: the dryer (9) is detachably connected with the ventilation pipe (8).

6. The low-temperature plasma photocatalytic exhaust gas purifier according to claim 1 or 4, characterized in that: the dryer (9) comprises a first shell (901), the first shell (901) is in threaded connection with a second shell (902), a cavity is arranged between the first shell (901) and the second shell (902), a drying mesh bag (903) is installed in the cavity, and a drying agent is filled in the drying mesh bag (903).

7. The low-temperature plasma photocatalytic exhaust gas purifier according to claim 1, characterized in that: the photocatalyst net (1002) is a strip-shaped wave net.

8. The low-temperature plasma photocatalytic exhaust gas purifier according to claim 1, characterized in that: the low-temperature plasma photocatalytic waste gas purifier further comprises a chimney (13), the chimney (13) is connected with the air outlet (12), and a centrifugal fan (14) is installed at the bottom of the chimney (13).