CN205252898U - VOCs's optoelectronic integration processing apparatus - Google Patents

Abstract

The utility model discloses a photoelectric integrated processing device for VOCs. The device is installed between a gas pretreatment device and a gas venting device. The photoelectric integrated processing device is an airtight casing, and the two ends of the casing are respectively There is an air inlet and an air outlet, and the shell between the air inlet and the air outlet is provided with a filter area, a photocatalytic area I, a corona area, a photocatalytic area II and an adsorption area, a photocatalytic area I and a photocatalytic II area. The air inlet end of the zone is equipped with an air distributor; the device of the utility model has a simple structure, and the VOCs organic waste gas is comprehensively treated by multiple groups of photoelectric treatment devices, and various pollutants in the organic waste gas are removed, and at the same time, it is selected according to the type of pollutants. Different operation modes, flexible operation and wide application range; the device has high comprehensive treatment efficiency for organic waste gas and good practical effect.

Description

A photoelectric integrated processing device for VOCs

technical field

The utility model relates to the technical field of waste gas treatment, in particular to a photoelectric integrated treatment device for VOCs.

Background technique

VOCs is the general term for non-methane hydrocarbons in the atmosphere. It is a strong volatile, special smell, irritating, and toxic organic gas. There are more than 150 VOCs detected in the air around the world, of which about 80 are toxic. Some of the remaining species have been listed as carcinogens, such as vinyl chloride, benzene, and polycyclic aromatic hydrocarbons. VOCs emitted from man-made pollution sources, such as paint production, painting, printing, pharmaceuticals, leather processing, resin processing and other production processes, are receiving increasing attention. The national "Twelfth Five-Year Plan" requires that the reduction of VOCs exhaust gas emission is 1.525 million tons per year. The local standard of Tianjin requires that the exhaust gas emission of enterprises shall be restricted in the second period since January 1, 2016, that is, the total of benzene series, non-methane The allowable maximum discharge concentration of total hydrocarbons has been reduced from 20mg/m ³ and 50mg/m ³ in the previous period I to 10mg/m ³ and 20mg/m ³ respectively.

At present, common VOCs waste gas treatment technologies are divided into recovery technology and destruction technology. Among them, the recovery technology is aimed at high concentration, especially > 5000mg/m ³ or relatively expensive VOCs. The commonly used recovery technologies mainly include adsorption, absorption, condensation, membrane technology, etc.; and for the emission of waste gas from most enterprises, most of them are Destruction technologies mainly include combustion, photocatalysis, biodegradation, plasma technology, etc.

1) At present, combustion technology is widely used, but it is only suitable for combustible or high-temperature decomposable organic waste gas, and it is easy to produce secondary pollution.

2) Photocatalytic technology is a new type of exhaust gas treatment technology. It uses ultraviolet light to irradiate the catalyst to make the electron-filled valence band transition to the empty conduction band, leaving positively charged holes (h+ ), forming electron-hole pairs. Photoinduced holes have strong oxidizing properties, which can capture electrons in organic substances adsorbed on the surface of semiconductor particles. Hydroxyl radicals will eventually decompose most of the organic substances into water and carbon dioxide, but the photocatalytic oxidation method has the disadvantages of deactivation of the catalyst, difficulty in fixing the catalyst, and lower catalytic efficiency after the catalyst is fixed.

3) Biodegradation technology was first applied to deodorization, but its application in VOCs treatment has disadvantages such as large volume, long residence time, and poor removal effect on exhaust gas with complex components or VOCs that are difficult to degrade.

4) Plasma is called the fourth form of matter. It is composed of electrons, ions, free radicals and neutral particles. It is a conductive fluid. The plasma technology with broad development prospects is corona discharge technology. In a uniform electric field, a high electric field strength is used to cause the gas to produce an "electron avalanche", and a large number of free electrons appear. These electrons accelerate and gain energy under the action of the electric field force, which can break the chemical bonds of organic matter and destroy the structure of organic matter. At the same time, corona discharge can produce substances with strong oxidizing ability represented by ozone, and oxidize organic matter. Using it to treat VOCs has the advantages of high efficiency, high energy utilization rate, simple equipment maintenance, and low cost. The requirements are very high. While decomposing VOCs molecules, some harmful by-products are produced, such as _NOx , CO, ozone, etc.

Contents of the invention

In view of the above existing problems, the purpose of this utility model is to provide an optoelectronic integrated treatment device with precise control, simple operation, and convenient comprehensive treatment of organic waste gas.

In order to achieve the above object, the technical scheme adopted by the utility model is as follows: a photoelectric integrated processing device for VOCs, the photoelectric integrated processing device is installed between the gas pretreatment device and the gas venting device, the photoelectric integrated processing device The chemical treatment device is a closed shell, and the two ends of the shell are respectively provided with an air inlet and an air outlet. The shell between the air inlet and the air outlet is sequentially provided with a filter area, a photocatalytic area I, and an electrocatalyst area. The halo area, the photocatalysis II area and the adsorption area, the air inlets of the photocatalysis I area and the photocatalysis II area are provided with airflow distributors.

As an improvement of the utility model, the filter area is provided with a bag filter and an electrostatic precipitator. The dust particles in the VOCs are processed by the bag filter and the electrostatic precipitator, which effectively protects the subsequent photoelectric processing module and prevents the dust particles from affecting the activity of the catalyst. At the same time, the device itself is easy to install and disassemble, and can facilitate dust collection and cleaning. Ash and replace.

As an improvement of the utility model, the metal oxidation catalyst in the photocatalytic zone I is one or a combination of two or more of TiO ₂ , ZnO, Al ₂ ozone, SnO ₂ and ZrO ₂ .

As an improvement of the utility model, the metal oxidation catalyst in the photocatalytic zone II is one or more of TiO ₂ , ZnO, Al ₂ ozone, SnO ₂ , ZrO ₂ with MnO ₂ components. combination.

As an improvement of the utility model, the surface of the metal oxidation catalyst in the photocatalytic zone II is doped with noble metal or transition metal element, and the noble metal element is one of Au, Ag, Pt, Rh, Pd or several, the transition rare metal element is one or several of Sc, Co, Ru, Re, La.

As an improvement of the utility model, a fixed bracket is provided in the corona area, and a plurality of corona rods are uniformly distributed on the fixed bracket.

As an improvement of the utility model, the corona rod is powered by a high-frequency pulse power supply, and the discharge electrode of the corona rod is loaded with a special catalyst of Ag/TiO ₂ or V ₂ O ₅ /TiO ₂ with high efficiency and synergistic photocatalysis.

As an improvement of the utility model, a group of activated carbon screens are arranged in the adsorption area, and the surface of the activated carbon screens is coated with triphenylamine and porphyrin sensitizers.

As an improvement of the utility model, the power lines in the filter area, the photocatalysis zone I, the corona zone, the photocatalysis zone II and the adsorption zone are respectively controlled by multiple groups of circuits, and each zone of the utility model device is Independent control, when the device processes some flammable and explosive VOCs waste gas with special components, it can close the corona area to prevent arc discharge or explosion, and ensure the safe operation of the device.

The working principle of the utility model device is as follows: when VOCs organic waste gas passes through the filter area from the air inlet, it is pretreated by the bag filter and electrostatic precipitator in the filter area, and is evenly transported to the photocatalysis zone I through the air flow distributor. Most of the organic molecules are oxidized and decomposed by free radicals excited by electron-hole pairs; the remaining complex organic molecules and some intermediate products form an "electronic avalanche" under the impact of high-energy particle flow in the corona area, effectively destroying the complex organic molecular structure, At the same time, this area will generate high concentration of ozone, which has a good bactericidal effect on bacteria and microorganisms in the exhaust gas; the organic molecules cut off by the corona area, inactivated bacteria and the formed ozone are effectively decomposed into _CO2 and H in the photocatalytic area II ₂ O, and under the catalysis of MnO ₂ , it promotes the complete oxidation and elimination of ozone to prevent secondary pollution; the exhaust gas treated by the photoelectric module is then adsorbed by activated carbon in the adsorption area to remove trace residual exhaust gas molecules and process products such as CO and NO _X , achieving Harmless emission, and the added sensitizer can be regenerated by itself under the action of photoelectricity, which effectively prolongs the service life of the photoelectric integrated treatment device.

The utility model has the advantages that: the device structure of the utility model is simple, and the VOCs organic waste gas is comprehensively treated by multiple groups of photoelectric processing devices, and various pollutants in the organic waste gas are removed, and different operating modes are selected according to the types of pollutants , flexible operation, wide practical range, convenient and safe production; the comprehensive treatment efficiency of the device for organic waste gas is high, the pollutants in the treated organic waste gas are greatly reduced, safe discharge can be performed, and the practical effect is good.

Description of drawings

Fig. 1 is the installation structure diagram of the utility model device;

Fig. 2 is a schematic diagram of the internal structure of the utility model device;

Fig. 3 is the side structural diagram of corona zone of the utility model;

Fig. 4 is a schematic diagram of the side structure of the photocatalytic zone of the utility model;

Fig. 5 is a schematic structural diagram of the adsorption zone of the present invention;

Among them, 1 gas pretreatment device, 2 photoelectric integrated processing device housing, 3 gas venting device, 4-1 air inlet, 4-2 gas outlet, 5 filter area, 6 photocatalytic area I, 7 corona area, 8. Photocatalysis II zone, 9. Adsorption zone, 10. Air distributor, 11. Medium pressure mercury lamp, 12. Grid frame, 13. Fixed bracket, 14. Corona rod, 15. Activated carbon screen.

detailed description

The utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Embodiment 1: a kind of photoelectric integrated processing device of VOCs as shown in Figure 1 and 2, described photoelectric integrated processing device 2 is installed between gas pretreatment device 1 and gas venting device 3, described photoelectric The integrated processing device is an airtight casing 2, and the two ends of the casing 2 are respectively provided with an air inlet 4-1 and an air outlet 4-2, and between the air inlet 4-1 and the air outlet 4-2 The casing 2 is provided with a filter area 5, a photocatalytic zone 6, a corona zone 7, a photocatalytic zone 8 and an adsorption zone 9 in sequence, and the inlet ends of the photocatalytic zone 6 and photocatalytic zone 6 An airflow distributor 10 is provided; through the airflow distributor, the organic waste gas that has passed through the filter area to remove solid particle impurities is evenly distributed to the photocatalytic zone I. Due to the large volume of the photocatalytic zone I, in order to ensure the uniform treatment of the gas by light and catalyst , to avoid affecting the treatment effect of the overall device due to excessive local airflow.

Embodiment 2: As shown in FIG. 2 , a bag filter and an electrostatic precipitator are installed in the filter area 5 . The bag filter and the electrostatic precipitator inside the device of the present invention are all conventional devices in the prior art. The bag filter and the electrostatic precipitator are evenly distributed in the filter area 5 in the housing, and the VOCs gas is sequentially in the filter area 5 After passing through the bag filter and electrostatic precipitator, after being treated by the electrostatic precipitator, it enters the photocatalytic zone I 6.

The dust particles in the VOCs are processed by the bag filter and the electrostatic precipitator, which effectively protects the subsequent photoelectric processing module and prevents the dust particles from affecting the activity of the catalyst. At the same time, the device itself is easy to install and disassemble, and can facilitate dust collection and cleaning. Ash and replace.

Embodiment 3: As shown in Figures 2 and 4, the photocatalytic zone I 6 and the photocatalytic zone II 8 are all composed of a medium-pressure mercury lamp 11 and a grid frame 12, and the grid frame 12 is arranged on the medium-pressure mercury lamp 11 On both sides, the grid frame 12 is provided with a metal oxidation catalyst; the metal oxidation catalyst in the photocatalytic zone I 6 is one or more of TiO ₂ , ZnO, Al ₂ ozone, SnO ₂ , ZrO ₂ The combination.

The metal oxidation catalyst in the photocatalytic II zone 8 described in the utility model is one or a combination of two or more of TiO ₂ , ZnO, Al ₂ ozone, SnO ₂ and ZrO ₂ with MnO ₂ components. The surface of the metal oxidation catalyst in the photocatalytic zone 8 is doped with noble metal or transition metal element, the noble metal element is one or more of Au, Ag, Pt, Rh, Pd, and the transition rare metal element One or more of Sc, Co, Ru, Re, La.

Embodiment 4: As shown in Figures 2 and 3, a fixed support 13 is provided in the corona area 7, and a plurality of corona rods 14 are evenly distributed on the fixed support 13. The corona rod 14 described in the utility model is powered by a high-frequency pulse power supply, and the discharge electrode of the corona rod 14 is loaded with a special catalyst with high efficiency and synergistic photocatalysis, and the special catalyst is Ag/TiO ₂ or V ₂ O ₅ /TiO ₂ .

Embodiment 5: As shown in Figures 2 and 5, a group of activated carbon screens 15 are arranged in the adsorption zone 9 described in the utility model, and the surface of the described activated carbon screens 15 is coated with a sensitizer, and the sensitive The sensitizer is triphenylamine or porphyrin sensitizer.

Embodiment 6: As shown in Figure 2, the filter area 5 described in the utility model, the photocatalytic I area 6, the corona area 7, the power lines in the photocatalytic II area 8 and the adsorption area 9 are respectively controlled by multiple groups of lines , each area of the utility model device is independently controlled, when the device is processing some flammable and explosive VOCs waste gas with special components, the power supply of the corona area 7 can be turned off to prevent arc discharge or explosion, and ensure that the device safety work.

Embodiment 7: the following is the operation example of using this device to process VOCs containing acetone, butanone, toluene, benzene, methyl formate, ethyl acetate, isopropanol and methylene chloride. In the operation process, corona is used respectively The operation mode of opening and closing the zone can be operated, and the detailed results are shown in the following table:

It can be drawn from the above table that the device of the present utility model has high comprehensive treatment efficiency for organic waste gas VOCs, and the treatment effect is good, and the content of pollutants in the treated organic waste gas is greatly reduced. For combustible gases such as esters and isopropyl ketone, the organic waste gas is treated by closing the corona zone, and only through the filter zone, photocatalytic zone and adsorption zone, which also has a good comprehensive treatment effect.

It should be noted that the above are only preferred embodiments of the present utility model, and are not intended to limit the protection scope of the present utility model. Equivalent transformations made on the basis of the above embodiments all belong to the protection scope of the present utility model.

Claims (6)

1. An optoelectronic integrated processing device for VOCs, said optoelectronic integrated processing device is installed between a gas pretreatment device and a gas venting device, characterized in that said optoelectronic integrated processing device is an airtight housing , the two ends of the housing are respectively provided with an air inlet and an air outlet, and the housing between the air inlet and the air outlet is provided with a filter area, a photocatalytic area I, a corona area, a photocatalytic area II and In the adsorption area, air distributors are provided at the inlet ends of the photocatalytic zone I and photocatalytic zone II. 2. The optoelectronic integrated processing device for VOCs according to claim 1, characterized in that a bag filter and an electrostatic precipitator are provided in the filter area. 3. The photoelectric integrated processing device for VOCs according to claim 1, characterized in that, the photocatalytic zone I and the photocatalytic zone II are both composed of a medium-pressure mercury lamp and a grid frame, and the grid frame It is arranged on both sides of the medium-pressure mercury lamp, and the metal oxidation catalyst is arranged on the grid frame. 4. The optoelectronic integrated treatment device for VOCs according to claim 1, characterized in that a fixed bracket is provided in the corona area, and a plurality of corona rods are evenly distributed on the fixed bracket. 5. The optoelectronic integrated treatment device of VOCs according to claim 1, characterized in that, a group of activated carbon screens are provided in the described adsorption zone, and the surface of the activated carbon screen is coated with triphenylamines or porphyrins class of sensitizers. 6. The optoelectronic integrated treatment device of VOCs according to claim 1 or 2 or 3 or 4 or 5, characterized in that, the filter area, photocatalysis I area, corona area, photocatalysis II area and adsorption The power lines in the zone are controlled separately by multiple groups of lines.