CN217287838U

CN217287838U - Photocatalysis synergistic purification device for treating complex waste gas

Info

Publication number: CN217287838U
Application number: CN202221203917.8U
Authority: CN
Inventors: 董国辉; 康晓爽; 董婷婷
Original assignee: Shaanxi University of Science and Technology
Current assignee: Shaanxi University of Science and Technology
Priority date: 2022-05-19
Filing date: 2022-05-19
Publication date: 2022-08-26
Anticipated expiration: 2032-05-19

Abstract

The utility model discloses a photocatalysis synergy purification device for treating complex waste gas, which comprises a shell, wherein a wet absorption zone, a photocatalysis zone and a tail gas absorption zone which are communicated with each other are sequentially arranged in the shell from bottom to top, absorption liquid is filled in the wet absorption zone, a micropore aerator is arranged at the bottom of the wet absorption zone, an air inlet, a liquid inlet and a liquid outlet are arranged on the side wall of the shell, and the micropore aerator is communicated with the air inlet; a plurality of photocatalytic baffle plates coated with photocatalyst are sequentially arranged on two side walls of the shell of the photocatalytic area, one end of each photocatalytic baffle plate is connected to the inner wall of the shell, two adjacent photocatalytic baffle plates are connected to the inner walls of different sides of the shell, and light sources are uniformly distributed on the inner wall of the shell of the photocatalytic area; the tail gas absorption area is filled with solid adsorbent, and the casing top is provided with the gas vent, can improve the pollutant and get rid of the effect.

Description

Photocatalysis synergistic purification device for treating complex waste gas

Technical Field

The utility model belongs to the technical field of clarification plant, a photocatalysis synergism purifier for handling complicated waste gas is related to.

Background

Along with the development of society, the pollution of waste gas generated in production and life of people is gradually increased, and harmful substances contained in the air slowly harm the health of human beings. In order to reduce the harm of polluted gas to human body, gas purification equipment is more and more widely applied in the current society.

At present, the following methods are mainly used for treating gas pollution: controlling a pollution source, namely controlling the concentration of pollutant emission at the source; plant purification, wherein harmful gases, dust and the like are adsorbed by planting green plants; the dilution diffusion method discharges odorous gas to the atmosphere through a chimney, or dilutes odorous gas with odorless air, and reduces the concentration of odorous substances to reduce odor. The traditional purification methods have the problems of high cost, incomplete removal, easy generation of secondary pollutants and the like.

At present, most of gas purification devices are only used for treating indoor gas pollutants in life and office of people. However, there are many places in the production and life where gas purification is required. Such as chemical laboratories, various plant plants, chemical warehouses, etc.; the concentration of gas pollutants in the places is high, the harm to human bodies is great, and an ideal purifying effect is not achieved through an air purifying device for households and offices.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a photocatalysis synergism purifier for handling complicated waste gas has solved the relatively poor problem of purifying effect who exists among the prior art.

The utility model adopts the technical proposal that the photocatalysis synergistic purification device for treating complex waste gas comprises a shell, a wet absorption zone, a photocatalysis zone and a tail gas absorption zone which are communicated with each other are arranged in the shell from bottom to top in sequence, absorption liquid is filled in the wet absorption zone, a microporous aerator is arranged at the bottom of the wet absorption zone, an air inlet, a liquid inlet and a liquid outlet are arranged on the side wall of the shell, and the microporous aerator is communicated with the air inlet; a plurality of photocatalytic baffle plates coated with photocatalyst are sequentially arranged on two side walls of the shell of the photocatalytic area, one end of each photocatalytic baffle plate is connected to the inner wall of the shell, two adjacent photocatalytic baffle plates are connected to the inner walls of different sides of the shell, and light sources are uniformly distributed on the inner wall of the shell of the photocatalytic area; the tail gas absorption area is filled with a solid adsorbent, and the top of the shell is provided with an exhaust port.

The utility model discloses a characteristics still lie in:

a partition board is arranged between the wet absorption area and the photocatalytic area, and a gas guide pipe is communicated with the partition board.

A porous plate is arranged between the photocatalysis area and the tail gas absorption area.

The photocatalytic baffle plate is connected to the inner wall of the shell at an inclined angle of 30-60 degrees.

The volume ratio of the wet absorption area to the photocatalytic area to the tail gas absorption area is 2: 3: 1.

the utility model has the advantages that:

the utility model discloses a photocatalysis synergy purifier for handling complicated waste gas, when utilizing the removal effect of photocatalyst, unite the wet process absorption to the absorption effect of pollutant in the waste gas for wet process absorption and photocatalysis get rid of and reach a synergistic effect's effect, thereby show better pollutant removal effect; the tail gas purification device is arranged, so that the adsorption treatment of secondary pollutants is realized, and the purification is more complete; convenient operation, low operation energy consumption, high efficiency and green removal of gas pollutants and no secondary pollution.

Drawings

FIG. 1 is a schematic structural diagram of a photocatalytic synergistic purification device for treating complex exhaust gas according to the present invention;

FIG. 2 is a left side view of the photocatalytic synergistic purification apparatus for treating complex exhaust gas of the present invention;

FIG. 3 is a top view of the photocatalytic synergistic purification device for treating complex exhaust gas of the present invention;

FIG. 4 is a data diagram of the catalytic treatment effect test of the photocatalytic synergistic purification apparatus for treating complex exhaust gases according to the present invention;

figure 5 is the utility model discloses a photocatalysis synergism purifier's for handling complicated waste gas effect tail gas absorption test data picture.

In the figure: 1. the device comprises a shell, 2 absorbing liquid, 3 microporous aerator, 4 air inlet, 5 liquid inlet, 6 liquid outlet, 7 photocatalytic baffle plate, 8 solid adsorbent, 9 air outlet, 10 partition plate, 11 gas guide pipe, 12 porous plate and 13 light source.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings and specific embodiments.

A photocatalysis synergy purifier for handling complicated waste gas, as shown in fig. 1-3, includes casing 1, and wet process absorption region, photocatalysis region, tail gas absorption region that communicate with each other are set gradually from bottom to top in casing 1, and the volume ratio of wet process absorption region, photocatalysis region, tail gas absorption region is 2: 3: 1. the wet method absorption area is filled with absorption liquid 2, the volume of the absorption liquid 2 accounts for about 2/3 of the whole wet method absorption area, the bottom of the wet method absorption area is provided with a microporous aerator 3, the side wall of the shell 1 is provided with an air inlet 4, a liquid inlet 5 and a liquid outlet 6, the microporous aerator 3 is communicated with the air inlet 4, the liquid inlet 5 is positioned above the liquid level of the absorption liquid 2, and the liquid outlet 6 is positioned below the liquid level; a plurality of photocatalytic baffle plates 7 are sequentially arranged on two side walls of the shell 1 of the photocatalytic area, photocatalysts are coated on the photocatalytic baffle plates 7, one end of each photocatalytic baffle plate 7 is connected to the inner wall of the shell 1, and two adjacent photocatalytic baffle plates 7 are connected to the inner walls of different sides of the shell 1, so that gas flows in an S shape in the photocatalytic area; further, the photocatalytic baffle plate 7 is connected to the inner wall of the shell 1 at an inclined angle of 30-60 degrees, the photocatalytic baffle plate 7 has a baffling effect on gas, sufficient contact between gas pollutants and a photocatalyst is guaranteed, light sources 13 are uniformly distributed on the inner wall of the shell 1 in a photocatalytic area and used for providing illumination, and sufficient energy sources on the photocatalytic baffle plate 7 are guaranteed, so that the photocatalyst is excited to generate photo-generated carriers, and the reaction of photocatalytic degradation of the gas pollutants is further completed. In this embodiment, the photocatalytic baffle 7 is made of an acid and alkali resistant PTFE material (a PTFE material), an LCP material (which is a novel polymer material), or an acrylic plate. The light source 13 is a linear light source, and may be a cylindrical lamp tube made of a transparent material. The tail gas absorption area is filled with a solid adsorbent 8 for adsorbing and treating residual pollutants in gas, and an exhaust port 9 is arranged at the top of the shell 1. The top of the shell 1 is provided with a detachable top cover, so that the solid adsorbent can be conveniently replaced.

Furthermore, the microporous aerator can be a disc-shaped microporous aerator, a tubular microporous aerator and the like, and the absorption liquid 2 can be flexibly changed along with main pollutants in the air and can be alkaline absorption liquid, acidic absorption liquid, organic absorption liquid and the like; the photocatalyst is a material which has obvious degradation effect on gas pollutants in the current research, such as titanium dioxide, carbon nitride and the like; the adsorbent can be selected from activated carbon, silica gel, zeolite molecular sieve, etc.

A partition board 10 is arranged between the wet absorption area and the photocatalysis area, and a gas guide pipe 11 is communicated on the partition board 10. Gas enters the photocatalytic region from the wet absorption region through the gas guide pipe 11, a porous plate 12 is arranged between the photocatalytic region and the tail gas absorption region, the aperture of the porous plate 12 is smaller than the particle size of the solid adsorbent 8, and the gas enters the tail gas absorption region from the photocatalytic region through the porous plate 12.

In this embodiment, a clamping groove is formed in the inner wall of the housing 1, and the photocatalytic baffle plate 7 is located in the clamping groove, so that the photocatalytic baffle plate is convenient to replace. The solid adsorbent 8 is placed in a non-cover cuboid similar to a drawer, and a porous plate 12 is arranged below the solid adsorbent 8, so that gas after photocatalytic reaction can conveniently enter a solid adsorption area, and the solid adsorbent can be conveniently replaced.

The photocatalysis principle in the photocatalysis region of the embodiment is as follows: in the photocatalytic treatment area, the photocatalyst is excited to generate photon-generated carriers under illumination, and OH adsorbed on the surface of the photocatalyst ^- And H ₂ O molecules are converted into active oxygen species with high oxidizability, so that long-chain hydrocarbons and aromatic ring pollutant molecules are decomposed into small molecular substances, such as water and carbon dioxide, which are harmless to human bodies.

The utility model discloses a photocatalysis synergism purifier for handling complicated waste gas's theory of operation as follows:

gas passes through air pump through air inlet 4 and gets into micropore aerator 3, disperses to the microbubble back diffusion through micropore aerator 3 and gets into absorption liquid 2 to wash with absorption liquid 2 full contact, absorption liquid 2 gets into from inlet 5, discharges from leakage fluid dram 6, the change of the absorption liquid 2 of being convenient for. After being absorbed by the wet method, the gas enters the photocatalytic area through the gas guide pipe 11, and under the irradiation of the light source 13, the gas to be treated is in full contact reaction with the photocatalyst and is converted. The gas after the photocatalytic reaction enters a solid adsorption area through a porous plate 12, residual pollutants in the gas are adsorbed by a solid adsorbent 8, and finally the purified gas is discharged through an exhaust port 9.

In this way, the utility model discloses a photocatalysis synergism purifier for handling complicated waste gas, when utilizing the removal effect of photocatalyst, unite the absorption of wet process absorption to the pollutant in the waste gas for wet process absorption and photocatalysis get rid of and reach a synergism's effect, thereby show better pollutant removal effect; the tail gas purification device is arranged, so that the adsorption treatment of secondary pollutants is realized, and the purification is more complete; convenient operation, low operation energy consumption, high efficiency and green removal of gas pollutants and no secondary pollution.

Examples

In this embodiment, sodium hydroxide is used as an absorption liquid of the gaseous pollutants, and the photocatalyst is carbon nitride obtained by calcining melamine as a precursor. The removal effect of simulated atmospheric pollutants (nitrogen oxides) is tested, the test result is shown in fig. 4, in a diagram, 1, 2 and 3 are respectively line graphs of the degradation effect of the catalyst, the absorption liquid and the synergistic effect of the catalyst and the absorption liquid on NO, and b diagram, 1 and 2 are respectively bar graphs of the degradation effect of the catalyst and the absorption liquid on NO, the pure wet absorption removal efficiency is 12 percent, the pure photocatalysis removal efficiency is 45 percent, and the combination of the pure wet absorption removal efficiency and the absorption liquid reaches 78 percent, so that the synergistic effect between the pure wet absorption removal efficiency and the absorption liquid can be judged, namely the wet absorption removal effect has an accelerating effect on the photocatalysis reaction of the latter unit.

Silica gel is used as a solid adsorbent, and the gas after the wet absorption and photocatalysis synergistic treatment is subjected to adsorption treatment in a solid absorption area. The results are shown in FIG. 5, where line 2 represents NO in the gas after the adsorbent action ₂ The broken line 1 is the result without the adsorbent. The comparison shows that NO is adsorbed ₂ The concentration of (A) is greatly reduced, and the reduction rate is about 77.1%. NO thereof ₂ The emission concentration is far lower than 420ppb required by GB16297-1996 integrated emission Standard for air pollutants, which shows that the device can achieve the purpose of effectively purifying the polluted gas.

Claims

1. The photocatalysis synergistic purification device for treating the complex waste gas is characterized by comprising a shell (1), wherein a wet absorption zone, a photocatalysis zone and a tail gas absorption zone which are communicated with each other are sequentially arranged in the shell (1) from bottom to top, absorption liquid (2) is filled in the wet absorption zone, a micropore aerator (3) is arranged at the bottom of the wet absorption zone, an air inlet (4), a liquid inlet (5) and a liquid outlet (6) are arranged on the side wall of the shell (1), and the micropore aerator (3) is communicated with the air inlet (4); a plurality of photocatalytic baffle plates (7) coated with photocatalyst are sequentially arranged on two side walls of the shell (1) of the photocatalytic area, one end of each photocatalytic baffle plate (7) is connected to the inner wall of the shell (1), two adjacent photocatalytic baffle plates (7) are connected to the inner walls of different sides of the shell (1), and light sources (13) are uniformly distributed on the inner wall of the shell (1) of the photocatalytic area; the tail gas absorption area is filled with a solid adsorbent (8), and an exhaust port (9) is formed in the top of the shell (1).

2. The photocatalysis synergistic purification device for treating complex exhaust gas according to claim 1, characterized in that a partition plate (10) is arranged between the wet absorption zone and the photocatalysis zone, and a gas guide pipe (11) is communicated on the partition plate (10).

3. A photocatalytic synergistic purification apparatus for treating complex exhaust gas according to claim 1, characterized in that porous plates (12) are arranged between the photocatalytic zone and the tail gas absorption zone.

4. A photocatalytic synergistic purification apparatus for treating complex exhaust gas according to claim 1, characterized in that the photocatalytic baffle plate (7) is connected to the inner wall of the housing (1) with an inclination angle of 30 ° to 60 °.

5. The device of claim 1, wherein the volume ratio of the wet absorption zone to the photocatalytic zone to the tail gas absorption zone is 2: 3: 1.