CN202527062U - Waste gas purification device - Google Patents

Abstract

The utility model provides a waste gas purification device which comprises a purifier box body, an atomization device and a catalysis device, wherein the purifier box body is provided with a waste gas inlet and a waste gas outlet; the atomization device is communicated with the purifier box body, and can atomize aqueous hydrogen peroxide solution into fog drops, and send the fog drops in the purifier box body; and the catalysis device is arranged in the purifier box body, and comprises glass fiber, as well as a photosensitive catalyst and a transitional metal catalyst arranged on the glass fiber. According to the waste gas purification device, the atomization device can atomize the aqueous hydrogen peroxide solution into the fog drops with small grain sizes and large specific surface area; when the fog drops absorb waste gas and are in oxidation reaction with pollutants in waste gas, larger contact area can be obtained, so that the purification efficiency is improved; the photosensitive catalyst and the transitional metal catalyst catalyze hydrogen peroxide to generate a great number of hydroxyl radical active oxygen substances and other substances; and the active oxygen substances can oxidize the pollutants in waste gas, so that the purification efficiency is further improved. Meanwhile, hydrogen peroxide in the fog drops is completely resolved, without causing secondary pollution.

Description

Exhaust gas purification device

technical field

The utility model belongs to the field of exhaust gas treatment, in particular to an exhaust gas purification device.

Background technique

With the rapid development of my country's national economy, especially the development of the chemical industry and manufacturing industry, the emission of industrial VOCs (volatile organic compounds) has been increasing, and it has become the main source of air compound pollution in key cities (groups) and local areas in my country. one of the reasons. Therefore, after dust removal, desulfurization, denitrification and motor vehicle pollution control, the pollution control of industrial VOCs has become the most important direction of air pollution control in my country.

In the production process of the spraying workshop, organic solvents such as xylene, toluene, ethyl acetate, butanone, etc. are often used. In organic chemical synthesis and petrochemical production workshops, a large amount of volatile and odorous waste gas will also be discharged. These exhaust gases often contain low-boiling, highly volatile compounds (VOCs), which are both toxic and flammable. VOCs not only have a stimulating effect on the human body, but also many of them are toxic, and some are mutagens and carcinogens. Olefins and certain aromatic compounds in VOCs can also react with nitrogen oxides in the atmosphere and expose to sunlight to form Los Angeles-type photochemical smog or industrial-type photochemical smog, causing secondary pollution. In view of the differences in VOCs components and concentrations in the exhaust gas, there are many kinds of industrial VOCs pollution control technologies commonly used in production in my country at present. According to the different treatment principles and process technologies, they can be divided into: when the concentration of VOCs is high (reaching spontaneous combustion) Level), use the torch combustion method; when the VOCs concentration is low, use the enrichment-combustion method, such as activated carbon enrichment-combustion, molecular sieve runner adsorption concentration combustion technology, regenerative catalytic combustion technology (RCO) and regenerative incineration technology ( RTO), etc.; others include plasma technology, water absorption-biological purification technology, water absorption-photocatalysis technology and water absorption-membrane technology. These technologies have their own advantages and disadvantages. The main disadvantages are: secondary pollution, high cost, etc. During use, the process is often selected according to the composition of VOCs components, emission intensity, VOCs concentration in exhaust gas, and emission environment characteristics.

However, the research and development of new products controlled by VOCs in my country is lagging behind, and there is a big gap between the overall treatment technology and foreign countries, and at the same time, it cannot meet the continuous needs of the market for new technologies. There is an urgent need to develop an efficient, clean, and low-cost industrial waste gas purification technology and device. Therefore, the research and development of VOCs purification technology has very important practical significance and has a very broad investment space.

Utility model content

In view of this, the utility model provides an exhaust gas purification device, which has high purification efficiency and does not produce secondary pollution.

In order to achieve the above object, the utility model provides the following technical solutions:

An exhaust gas purification device, comprising:

The purifier box is provided with an exhaust gas inlet and an exhaust gas outlet;

An atomizing device, connected to the purifier box, the atomizing device can atomize the hydrogen peroxide aqueous solution into droplets, and send the droplets into the purifier box;

The catalytic device is arranged in the box body of the purifier, including glass fiber and photosensitive catalyst and transition metal catalyst modified on the surface of the glass fiber.

Preferably, in the above-mentioned exhaust gas purification device, a plurality of the glass fibers are arranged at certain intervals along the axial direction of the purifier box.

Preferably, in the above exhaust gas purification device, the exhaust gas purification device further includes an ultraviolet lamp, and the ultraviolet lamp is arranged in the purifier box.

Preferably, in the above-mentioned exhaust gas purification device, a plurality of the ultraviolet lamps are arranged at certain intervals along the axis of the glass fiber.

Preferably, in the above exhaust gas purification device, the atomization device includes an ultrasonic atomizer and a mist feeder, the mist feeder is connected between the ultrasonic atomizer and the purifier box, and the mist feeder The device includes a pipeline and a fan arranged in the pipeline.

Preferably, in the above exhaust gas purification device, the bottom of the purifier box is set as a conical water collector, and the exhaust gas purification device also includes a water replenishment system, one end of which is connected to the atomization device, and another One end is respectively connected to the water collector and an external water source.

Preferably, in the above exhaust gas purification device, the exhaust gas purification device further includes a control system and a liquid level sensor, the liquid level sensor is arranged in the water collector, and the control system receives the signal of the liquid level sensor And control the water replenishment system to increase or decrease the water supplied by the external water source.

Preferably, in the above exhaust gas purification device, the exhaust gas purification device further includes a control system and an exhaust gas monitoring sensor, the exhaust gas monitoring sensor is arranged at the exhaust gas outlet, and the control system receives the signal of the exhaust gas monitoring sensor and controls The atomizing device increases or decreases the amount of mist produced.

Preferably, in the above exhaust gas purification device, the transition metal catalyst is transition metal copper.

Preferably, in the above exhaust gas purification device, the purifier box is made of stainless steel plate, PP plate or PVC plate.

Compared with the prior art, the exhaust gas purification device provided by the utility model includes: a purifier box body, which is provided with an exhaust gas inlet and an exhaust gas outlet; an atomization device, which is connected to the purifier box body, and the atomization device can The hydrogen peroxide aqueous solution is atomized into mist droplets, and the mist droplets are sent into the purifier box; the catalytic device is located in the purifier box, including glass fibers and photosensitive catalysts modified on the surface of the glass fibers and transition metal catalysts. In the exhaust gas purification device of the present invention, the atomization device can atomize the hydrogen peroxide solution into droplets with small particle size and large specific surface area, and can obtain larger The contact area improves the purification efficiency; the photosensitive catalyst and the transition metal catalyst catalyze hydrogen peroxide to generate a large number of active oxygen species such as hydroxyl radicals, which can oxidize the exhaust gas, thereby further improving the purification efficiency. At the same time, the hydrogen peroxide in the mist will be completely decomposed without causing secondary pollution.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a schematic structural diagram of an exhaust gas purification device provided in a specific embodiment of the present invention.

Detailed ways

The utility model modifies the photosensitive catalyst TiO ₂ and the transition metal copper on the glass fiber, and prepares the environmental catalytic material with high catalytic activity of hydrogen peroxide (H ₂ O ₂ ). Combining the material with an ultrasonic atomizer and coupled with ultraviolet light source enhanced catalytic technology, an efficient, clean, low operating cost, and easy-to-control industrial waste gas purification technology and device have been created.

In order to enable those skilled in the art to better understand the technical solution of the utility model, the utility model is clearly and completely described below in conjunction with the accompanying drawings and specific embodiments. Apparently, the described embodiments are only part of the embodiments of the utility model , but not all examples. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

The embodiment of the utility model provides an exhaust gas purification device, comprising:

The purifier box is provided with an exhaust gas inlet and an exhaust gas outlet;

An atomizing device, connected to the purifier box, the atomizing device can atomize the hydrogen peroxide aqueous solution into droplets, and send the droplets into the purifier box;

The catalytic device is arranged in the box body of the purifier, including glass fiber and photosensitive catalyst and transition metal catalyst modified on the surface of the glass fiber.

FIG. 1 is a schematic structural diagram of an exhaust gas purification device 10 provided in an embodiment of the present invention.

Purifier casing 11 adopts stainless steel plate, pp plate (polypropylene plate) or PVC plate to be processed into cylinder, and its axis is positioned at horizontal direction. Preferably, the purifier box 11 in the utility model is made of stainless steel plate, because the stainless steel plate has good reflective properties, it can reflect the light of the ultraviolet lamp inside it, which improves the catalytic effect of the ultraviolet lamp, and also Waste is avoided. Due to the poor reflective properties of pp board or PVC board, stainless steel lining can be set on the inner wall. It is easy to imagine that the shape and size of the purifier box 11 can be set according to actual applications.

The bottom of the purifier box 11 is arranged as a conical water collector 111 , which is located below the catalytic device 13 to collect atomized condensed water. The left end of the purifier box 11 is provided with a waste gas inlet, and the right end is provided with a waste gas outlet. A flange 112 is provided at the exhaust gas inlet, and a pipeline 113 is connected to the exhaust gas inlet, and the pipeline 113 is used to guide the exhaust gas into the interior of the purifier box 11 .

The atomizing device 12 includes an ultrasonic atomizer 121 and a mist delivery device 122, the mist delivery device 122 is connected between the ultrasonic atomizer 121 and the purifier box 11, and the mist delivery device 122 includes a pipeline 1221 and is located in the pipeline. The blower 1222.

The parameters of the ultrasonic atomizer 121 and its mist production are selected according to the actual flow rate of exhaust gas (mainly referring to VOCs) discharged by the factory. The amount of mist to be sent is determined according to the concentration of exhaust gas (mg/m ³ ), and the ratio of mist per unit volume to the total mass of exhaust gas is 0.5-5:1.

The catalytic device 13 is arranged in the purifier box 11 and includes glass fibers 131 and photosensitive catalysts (TiO ₂ ) and transition metal catalysts modified on the surfaces of the glass fibers. The transition metal catalyst is preferably transition metal copper.

A plurality of glass fibers 131 are arranged at certain intervals along the axial direction of the purifier box 11 . The shape of the glass fiber 131 is set according to the cross-sectional shape of the purifier box 11. The size and shape of each glass fiber 131 are the same. Preferably, the glass fiber 131 is disc-shaped, and its thickness is preferably 5mm. The number of glass fibers 131 is determined by the axial length of the purifier box 11, and the distance between adjacent glass fibers 131 is preferably 20mm.

The exhaust gas purification device 10 also includes an ultraviolet lamp 14 , and the ultraviolet lamp 14 is arranged in the purifier box 11 . A plurality of ultraviolet lamps 14 are arranged at certain intervals along the axis of the glass fiber 131 to form an ultraviolet strengthening reaction zone.

The exhaust gas purification device 10 also includes a water supply system 15, one end of the water supply system 15 is connected to the atomizing device 12, and the other end is respectively connected to the water collector 111 and an external water source. The external water source is preferably an automatic water replenisher connected to a water pipe.

The exhaust gas purification device 10 also includes a control system 16 and a liquid level sensor 17, the liquid level sensor 17 is set in the water collector 111, the control system 16 receives the signal of the liquid level sensor 17 and controls the water supply system 15 to increase or decrease the water supplied by the external water source .

The water in the water collector 111 can be used by the ultrasonic nebulizer 121 after being filtered and then adding hydrogen peroxide of corresponding concentration. Therefore, no residual waste water will be generated during the whole treatment process, and the purification process is very clean.

The liquid level sensor 17 is used to sense the water level in the water collector 111. When the water in the water collector 111 can satisfy the use of the ultrasonic atomizer 121, the supply of external water sources can be reduced or not required; When the water level in the tank 111 is too low, the control system 16 controls the water supply system 15 to increase the water supplied by the external water source. The flow of the external water source can be realized by controlling the opening and closing of its solenoid valve.

The exhaust gas purification device 10 also includes an exhaust gas monitoring sensor 18, which is installed at the exhaust gas outlet. The control system 16 receives the signal of the exhaust gas monitoring sensor 18 and controls the atomizing device 12 to increase or decrease the mist production.

The exhaust gas monitoring sensor 18 is used to monitor the exhaust gas concentration in the exhaust gas in real time. According to the height of the emission source and the exhaust gas emission characteristics of the emission source (such as pollutant types, emission intensity, etc.), and its requirements to meet the limit value in the "Comprehensive Emission Standard of Air Pollutants" (GB16297-1996), the emission is designed. The automatic control parameters of the source, and the exhaust gas monitoring sensor 18 is used as a real-time control command to establish an automatic fogging amount control feedback, so that the entire system is completely in an automatic control state.

The user can adjust the volume of the purifier box 11 or the number of glass fibers 131 or the amount of hydrogen peroxide atomization according to actual needs. After parameter optimization, it can meet the treatment requirements of different types of industrial waste gas. In addition, when the exhaust gas components are complex and the concentration is high, or multiple sets of exhaust gas purification devices 10 can be used in series, satisfactory results can be obtained.

The working principle of the exhaust gas purification device 10 is: use the ultrasonic atomizer 121 to form extremely small and uniform mist droplets containing a certain concentration of hydrogen peroxide solution. The droplets are sent into the purifier box 11 connected with the pipeline 1221 by air flow, so that the droplets are in contact with the VOCs in the pipeline 113, and the droplets with small particle size and large specific surface area absorb the VOCs in the flue gas and interact with the VOCs therein. Hydrogen peroxide reacts to oxidize the VOCs components that are easily oxidized first; when the mist meets the catalytic device 13, water droplets are formed, and the hydrogen peroxide is catalyzed by the photosensitive catalyst (TiO ₂ ) and transition metal copper, A large number of reactive oxygen species such as hydroxyl radicals are generated, and these reactive oxygen species further oxidize VOCs, and are catalyzed and oxidized by ultraviolet light. Therefore, this process can completely oxidize VOCs, and at the same time, the hydrogen peroxide in the mist droplets is also completely decomposed, which will not cause secondary air pollution. Thus, the purpose of purifying VOCs components is achieved. At the same time, in the catalytic oxidation zone of the catalytic device 13 (cooperating with ultraviolet light), the mist droplets condense on the solid phase interface of the glass fiber 131, and gather along the wall of the device under the action of gravity, and then collect the water source through the water collector 111 ; The collected water is filtered (such as containing suspended particles), and after adding hydrogen peroxide of corresponding concentration, it can be used by the ultrasonic atomizer 121 again. Therefore, this technology does not generate residual wastewater during the entire treatment process, and the purification process is very clean. According to the comparison between the commercial electric heating humidifier and the ultrasonic nebulizer, usually under the same mist production (30Kg/h), the ultrasonic nebulizer only accounts for about 13.3% of the power consumed by the electric heating humidifier, so the ultrasonic nebulizer Energy consumption is much lower than that of electric heating, so the exhaust gas purification device 10 of the present utility model is very energy-saving and has low operating cost.

The effect of the exhaust gas purification device 10 provided by the present invention will be described in detail below in conjunction with the embodiments.

Example 1

Analysis of purification effect of xylene-containing waste gas in automobile spraying workshop.

For the industrial waste gas containing xylene solvent discharged from the spraying workshop, the above-mentioned waste gas purification device 10 was used to conduct a field test. The design treatment capacity of the waste gas purification device 10 is 0.1m ³ /min. The experimental results are shown in Table 1 below (air flow temperature is 25°C). It can be seen from the table that when the concentration of VOCs is lower than 1000mg/m ³ and the mass ratio of fog water to VOCs is controlled at 1-2, the required limits of the emission standards can be met within the scope of the design processing capacity. And when the VOCs concentration is above 2000mg/ ^m3 , with the increase of emission concentration, while controlling the mass ratio of mist addition to VOCs > 2, when the processing capacity of the device reaches 40%-120% of the design capacity, the gas output The concentration values of middle xylene are all within the range stipulated by the discharge standard. The above experimental results well illustrate that this technology has a good purification effect on xylene-containing waste gas.

Table 1

Example 2

Analysis of purification effect of phenol-containing waste gas in chemical synthesis workshop.

The above-mentioned waste gas purification device 10 was used to carry out field tests on phenol-containing waste gas from chemical synthesis workshops, and the design treatment capacity of the waste gas purification device 10 was 0.1 m ³ /min. The experimental results are shown in Table 2 below (air flow temperature is 45°C). It can be seen from the table that during the experiment, when the phenol content in the pipeline exhaust gas is in the range of 200-1000mg/ ^m3 , and the mass ratio of fog water to VOCs is controlled at 0.7-2.0, the requirements of the emission standard can be met within the scope of the design treatment capacity. value. The above experimental results well illustrate that this technology has a good purification effect on waste gas with a phenol concentration lower than 1000 mg/m ³ .

Table 2

Example 3

Analysis on purification effect of production waste gas containing ethyl acetate.

Ethyl acetate is a common diluent for film coating materials, which is released during the drying process to form ethyl acetate organic waste gas in the film coating process. The concentration of ethyl acetate in the exhaust gas fluctuates greatly, generally in the range of several hundred to several thousand mg/ ^m3 .

The above-mentioned waste gas purification device 10 was used to carry out a field test on the production waste gas containing ethyl acetate, and the design treatment capacity of the purification device 10 was 0.1 m ³ /min. The experimental results are listed in Table 3 below (air flow temperature is 55°C). It can be seen from the table that when the concentration of VOCs is lower than 1000mg/m ³ and the mass ratio of fog water to VOCs is controlled at 0.8-2.0, the required limits of the emission standards can be met within the scope of the design processing capacity. And when the concentration is above 2000mg/m ³ , with the increase of the discharge concentration, while controlling the mass ratio of the amount of mist to VOCs > 2, when the processing capacity of the device reaches 40%-120% of the design capacity, the output gas The concentration values of ethyl acetate are all within the range specified by the emission standards. The above experimental results well illustrate that this technology has a good purification effect on waste gas containing ethyl acetate.

table 3

In summary, the exhaust gas purification device provided by the utility model includes: a purifier box, which is provided with an exhaust gas inlet and an exhaust gas outlet; The hydrogen solution is atomized into mist droplets, and the mist droplets are sent into the purifier box; the catalytic device is arranged in the purifier box, including glass fibers and photosensitive catalysts and transition metals modified on the surface of the glass fibers catalyst. In the exhaust gas purification device of the present invention, the atomization device can atomize the hydrogen peroxide solution into droplets with small particle size and large specific surface area, and can obtain larger The contact area improves the purification efficiency; the photosensitive catalyst and the transition metal catalyst catalyze hydrogen peroxide to generate a large number of active oxygen species such as hydroxyl radicals, which can oxidize the exhaust gas, thereby further improving the purification efficiency. At the same time, the hydrogen peroxide in the mist will be completely decomposed without causing secondary pollution.

The above description of the disclosed embodiments enables those skilled in the art to realize or use the utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. a waste gas purification apparatus is characterized in that, comprising:

The clarifier casing is provided with exhaust gas entrance and waste gas outlet;

Atomising device is communicated in said clarifier casing, and this atomising device can be atomized into droplet with aqueous hydrogen peroxide solution, and this droplet is sent in the said clarifier casing;

Catalytic unit is located in the said clarifier casing, comprises glass fibre and modifies light-sensitive catalyst and the transition-metal catalyst on this fiberglass surfacing.

2. waste gas purification apparatus according to claim 1 is characterized in that, a plurality of said glass fibres axially are provided with certain interval along said clarifier casing.

3. waste gas purification apparatus according to claim 2 is characterized in that said waste gas purification apparatus also comprises uviol lamp, and said uviol lamp is located in the said clarifier casing.

4. waste gas purification apparatus according to claim 3 is characterized in that, a plurality of said uviol lamps are provided with certain interval along the axis of said glass fibre.

5. waste gas purification apparatus according to claim 1; It is characterized in that; Said atomising device comprises ultrasonic ultrasonic delay line memory and send day with fog, and the said day with fog that send is connected between ultrasonic ultrasonic delay line memory and the said clarifier casing, saidly send day with fog to comprise pipeline and is located at the blower fan in this pipeline.

6. waste gas purification apparatus according to claim 1; It is characterized in that; The water collector of taper is arranged in the bottom of said clarifier casing; Said waste gas purification apparatus also comprises water charging system, and this water charging system one end is connected in said atomising device, and the other end is connected to said water collector and external water source.

7. waste gas purification apparatus according to claim 6; It is characterized in that; Said waste gas purification apparatus also comprises control system and liquid level sensor; Said liquid level sensor is located in the said water collector, and said control system receives the signal of said liquid level sensor and controls the water that said water charging system increases or reduce the external water source supply.

8. waste gas purification apparatus according to claim 1; It is characterized in that; Said waste gas purification apparatus also comprises control system and waste gas monitoring sensor; Said waste gas monitoring sensor is located at said waste gas outlet, and said control system receives the signal of said waste gas monitoring sensor and controls said atomising device increases or reduce the mist amount of producing.

9. waste gas purification apparatus according to claim 1 is characterized in that, said transition-metal catalyst is a transition metal copper.

10. waste gas purification apparatus according to claim 1 is characterized in that, said clarifier casing adopts stainless steel materials or PP plate or PVC plate to process.

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