CN217287838U - Photocatalytic synergistic purification device for complex exhaust gas treatment - Google Patents

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

Photocatalytic synergistic purification device for complex exhaust gas treatment

technical field

The utility model belongs to the technical field of purification equipment, and relates to a photocatalytic synergistic purification device for treating complex exhaust gas.

Background technique

With the development of society, the waste gas pollution generated by people's production and life has gradually increased, and the harmful substances contained in the air are also slowly endangering human health. In order to reduce the harm of polluted gas to the human body, gas purification equipment is more and more widely used in today's society.

At present, there are mainly the following methods for gas pollution treatment: pollution source control, which controls the concentration of pollutant emissions at the source; plant purification, which absorbs harmful gases, dust, etc. by planting green plants; dilution and diffusion method, which passes odorous gases through The chimney is discharged to the atmosphere, or diluted with odorless air to reduce the concentration of odorous substances to reduce odor. These traditional purification methods have problems such as high cost, incomplete removal, and easy generation of secondary pollutants.

At present, most gas purification devices are only used to treat indoor gas pollutants in people's lives and offices. However, there are still many places that require gas purification in production and life. For example, chemical laboratories, various factory workshops, chemical warehouses, etc.; these places have high concentrations of gas pollutants, which are extremely harmful to the human body. There is no way to achieve an ideal purification effect through air purification devices for home and office use.

Utility model content

The purpose of the utility model is to provide a photocatalytic synergistic purification device for treating complex exhaust gas, which solves the problem of poor purification effect in the prior art.

The technical scheme adopted by the utility model is that a photocatalytic synergistic purification device for treating complex exhaust gas comprises a casing, and a wet absorption area, a photocatalytic area, and a tail gas interconnected with each other are sequentially arranged in the casing from bottom to top. In the absorption area, the wet absorption area is filled with absorbing liquid, the bottom of the wet absorption area is provided with a microporous aerator, and the side wall of the shell is provided with an air inlet, a liquid inlet, a liquid discharge port, and a microporous aerator Connected with the air inlet; a plurality of photocatalytic baffles coated with photocatalysts are sequentially arranged on the two side walls of the casing of the photocatalytic area, and one end of each photocatalytic baffle is connected to the inner wall of the casing, and two adjacent photocatalytic baffles are connected to the inner wall of the casing. The catalytic baffles are connected to the inner walls on different sides of the casing, and light sources are evenly distributed on the inner wall of the casing in the photocatalytic zone; the exhaust gas absorption zone is filled with solid adsorbent, and the top of the casing is provided with an exhaust port.

The utility model is characterized in that:

A separator is arranged between the wet absorption zone and the photocatalytic zone, and a gas guide pipe is connected to the separator.

A porous plate between the photocatalytic zone and the exhaust gas absorption zone.

The photocatalytic baffle is connected to the inner wall of the casing at an inclination angle of 30° to 60°.

The volume ratio of wet absorption area, photocatalytic area and exhaust gas absorption area is 2:3:1.

The beneficial effects of the present utility model are:

The photocatalytic synergistic purification device of the utility model is used for the treatment of complex exhaust gas, which utilizes the removal effect of the photocatalyst and combines the absorption effect of the wet method to absorb the pollutants in the exhaust gas, so that the wet method absorption and the photocatalytic removal achieve one Synergistic effect, thus showing better pollutant removal effect; set up exhaust gas purification device, so as to realize the adsorption treatment of secondary pollutants, so that the purification is more complete; easy to operate, low operating energy consumption, and effective against gas pollutants The removal of high-efficiency green, no secondary pollution.

Description of drawings

Fig. 1 is the structural representation of the photocatalytic synergistic purification device used for the treatment of complex exhaust gas according to the present invention;

Fig. 2 is the left side view of the photocatalytic synergistic purification device of the present utility model for treating complex exhaust gas;

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

Fig. 4 is the catalytic treatment effect test data diagram of the photocatalytic synergistic purification device for treating complex exhaust gas according to the present invention;

FIG. 5 is a graph showing the effect of the exhaust gas absorption test data of the photocatalytic synergistic purification device for treating complex exhaust gas according to the present invention.

In the figure: 1. Shell, 2. Absorbing liquid, 3. Microporous aerator, 4. Air inlet, 5. Liquid inlet, 6. Liquid outlet, 7. Photocatalytic baffle, 8. Solid Adsorbent, 9. Exhaust port, 10. Separator, 11. Gas guide tube, 12. Perforated plate, 13. Light source.

Detailed ways

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

The photocatalytic synergistic purification device for treating complex exhaust gas, as shown in Figure 1-3, includes a casing 1, and the casing 1 is sequentially provided with interconnected wet absorption area, photocatalytic area, The volume ratio of tail gas absorption zone, wet absorption zone, photocatalytic zone and tail gas absorption zone is 2:3:1. The wet absorption area is filled with an absorption liquid 2, and the volume of the absorption liquid 2 accounts for about 2/3 of the entire wet absorption area. The bottom of the wet absorption area is provided with a microporous aerator 3, and the side wall of the shell 1 is provided with an inlet. The air port 4, the liquid inlet 5, the liquid discharge port 6, the microporous aerator 3 is connected with the air inlet 4, the liquid inlet 5 is located above the liquid level of the absorption liquid 2, and the liquid discharge port 6 is located below the liquid level; A plurality of photocatalytic baffles 7 are sequentially arranged on the two side walls of the shell 1 in the area, and the photocatalytic baffles 7 are coated with photocatalysts. And two adjacent photocatalytic baffles 7 are connected to the inner walls of the housing 1 on different sides, so that the gas flows in an S-shape in the photocatalytic area; further, the photocatalytic baffles 7 are inclined at an angle of 30° to 60°. Connected to the inner wall of the shell 1, the photocatalytic baffle plate 7 has a deflecting effect on the gas at the same time to ensure full contact between the gas pollutants and the photocatalyst, and light sources 13 are evenly distributed on the inner wall of the shell 1 in the photocatalytic area to provide The illumination ensures sufficient energy source on the photocatalytic baffle 7, thereby exciting the photocatalyst to generate photogenerated carriers, and further completing the photocatalytic degradation reaction of gas pollutants. In this embodiment, the photocatalytic baffle 7 is made of PTFE material (a kind of polytetrafluoroethylene material), LCP material (which is a new type of polymer material) or acrylic plate of acid and alkali resistant plate. The light source 13 is a linear light source, which can be a cylindrical lamp tube made of transparent material or the like. The exhaust gas absorption area is filled with solid adsorbent 8 for adsorption treatment of residual pollutants in the gas, and an exhaust port 9 is provided on the top of the housing 1 . The top of the housing 1 is provided with a detachable top cover, which is convenient for the replacement of the solid adsorbent.

Further, the microporous aerator can be a disc-shaped microporous aerator and a tubular microporous aerator, etc. The absorption liquid 2 can be flexibly changed with the main pollutants in the air, and can be an alkaline absorption liquid or an acid absorption liquid. and organic absorption liquid, etc.; photocatalysts are materials that have obvious degradation effect on gas pollutants in current research, such as titanium dioxide, carbon nitride, etc.; adsorbents can be selected from activated carbon, silica gel, zeolite molecular sieve, etc.

A separator 10 is arranged between the wet absorption zone and the photocatalytic zone, and a gas guide tube 11 is connected to the separator 10 . The gas enters the photocatalytic zone from the wet absorption zone through the gas guide pipe 11, and the perforated plate 12 between the photocatalytic zone and the exhaust gas absorption zone. The aperture of the porous plate 12 is smaller than the particle size of the solid adsorbent 8. The photocatalytic zone enters the exhaust gas absorption zone.

In this embodiment, the inner wall of the housing 1 is provided with a card slot, and the photocatalytic baffle 7 is located in the card slot, which is convenient for replacement. The solid adsorbent 8 is placed in a cuboid without a lid similar to a drawer. Below the solid adsorbent 8 is a perforated plate 12, which facilitates the entry of the gas after photocatalytic reaction into the solid adsorption zone and facilitates the replacement of the solid adsorbent.

The principle of photocatalysis in the photocatalytic zone of this embodiment: the pollutant gas is in the photocatalytic treatment zone, under the illumination, the photocatalyst is excited to generate photogenerated carriers, and the ^OH- and H ₂ O molecules adsorbed on the surface of the catalyst are converted into Highly oxidizing reactive oxygen species, thereby decomposing long-chain hydrocarbon and aromatic ring pollutant molecules into small molecules such as water and carbon dioxide that are harmless to the human body.

The working principle of the photocatalytic synergistic purification device for the treatment of complex exhaust gas of the present invention is as follows:

The gas enters the microporous aerator 3 through the air inlet 4 through the air pump, disperses into the micro-bubbles through the microporous aerator 3 and diffuses into the absorption liquid 2, and fully contacts with the absorption liquid 2 for elution, and the absorption liquid 2 flows from the inlet. The liquid port 5 enters and is discharged from the liquid discharge port 6, which is convenient for the replacement of the absorption liquid 2. After wet absorption, 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 and the photocatalyst are fully contacted and reacted, and are converted. The gas after photocatalytic reaction enters the solid adsorption zone through the porous plate 12 , and is adsorbed by the solid adsorbent 8 to the residual pollutants in the gas, and finally the purified gas is discharged through the exhaust port 9 .

Through the above methods, the photocatalytic synergistic purification device for treating complex exhaust gas of the present invention utilizes the removal effect of the photocatalyst and combines the absorption effect of the wet absorption on the pollutants in the exhaust gas, so that the wet absorption and the photocatalytic effect are combined. The removal achieves a synergistic effect, thus showing a better pollutant removal effect; a tail gas purification device is installed to realize the adsorption treatment of secondary pollutants and make the purification more complete; easy to operate, low operating energy consumption, The removal of gas pollutants is efficient and green, without secondary pollution.

Example

In this example, sodium hydroxide is used as the absorbing liquid for gas pollutants, and the photocatalyst is carbon nitride obtained by calcining melamine as a precursor. The removal effect of simulated air pollutants (nitrogen oxides) was tested. The test results are shown in Figure 4. In Figure a, 1, 2, and 3 are the broken lines of the NO degradation effect of the catalyst, the absorption liquid and the synergistic effect of the two. Figure, b Figures 1 and 2 are the histograms of the degradation effects of the catalyst and the absorbing solution on the NO degradation, respectively. We found that the removal efficiency of pure wet absorption is 12%, and the efficiency of pure photocatalytic removal is 45%, while the two The combination of the two reached 78%, so it can be judged that there is indeed a synergistic effect between the two, that is, the wet absorption has a promoting effect on the photocatalytic reaction of the latter unit.

Using silica gel as a solid adsorbent, the gas after wet absorption + photocatalytic synergistic treatment is adsorbed in the solid absorption zone. The results are shown in Figure 5, where the broken line 2 is the test result of the concentration of NO ₂ in the gas with the adsorbent, and the broken line 1 is the result without the adsorbent. By comparison, it is found that the concentration of NO ₂ after adsorption treatment has dropped significantly, and the drop rate is about 77.1%. Its NO ₂ emission concentration is far lower than the 420ppb required by GB16297-1996 "Comprehensive Emission Standard of Air Pollutants", indicating that the device can achieve the purpose of effectively purifying polluted gases.

Claims (5)

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.

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