CN107051195B - Organic waste gas partition oxidation cyclone purification method and device - Google Patents

Abstract

The invention discloses a method and a device for purifying organic waste gas by partition oxidation and rotational flow; comprises a cyclone purifying tower and a catalytic absorbent recycling system arranged at the bottom of the cyclone purifying tower; a catalytic absorbent rotational flow atomizing layer, an ultraviolet ray partition oxidation layer and an absorption waste gas demisting layer are sequentially arranged in the rotational flow purification tower from bottom to top; the catalytic absorbent recycling system is used for providing nano titanium dioxide atomized liquid required by atomization for the cyclone atomization layer of the catalytic absorbent and recovering nano titanium dioxide slurry falling back to the catalytic absorbent recycling system under the action of gravity. The adopted cyclone atomizer atomizes the nano titanium dioxide slurry, so that the contact area of the nano titanium dioxide slurry and the organic waste gas is increased, and the catalytic efficiency is improved; the cyclone atomizer adopts tangential circle arrangement, so that the nano titanium dioxide slurry spirally rises along the tangential circle, the disturbance degree of the organic waste gas and the catalyst is increased, and the reaction rate is improved.

Description

A method and device for purifying organic waste gas by zonal oxidation and cyclone flow

technical field

The invention relates to the purification of organic waste gas, in particular to a method and device for purifying organic waste gas by zonal oxidation swirling flow.

Background technique

With the rapid development of my country's economy, the problem of organic waste gas pollution has become increasingly serious in recent years. The number of haze days in many areas has continued to increase, seriously affecting people's normal life and health. More and more scholars have begun to conduct research on the treatment of organic waste gas pollution, and have also developed many effective treatment methods. Research on organic waste gas pollution control technology can, on the one hand, create a good living environment for the society and improve people's quality of life; on the other hand, it can provide enterprises with environmental protection measures and improve the ability of sustainable industrial development.

Organic waste gas mainly comes from petrochemical, pharmaceutical, paint, printing and other industries. There are many types of organic waste gas, mainly aromatic hydrocarbons, alcohols, halogenated hydrocarbons, aldehydes, and ketones. At present, the treatment methods of organic waste gas can be divided into two categories, one is recycling technology, and the other is destruction technology. Traditional recycling technologies include: absorption technology, adsorption technology and condensation recovery technology. Traditional destruction technologies mainly refer to combustion technologies. New destruction technologies developed in recent years include low-temperature plasma technology, biotechnology, and photocatalysis.

Recycling technology has the following characteristics:

The absorption method is mainly to fully contact the organic waste gas with the absorbent, so that the absorbent can absorb the harmful molecules in the organic waste gas and play a role in purifying the organic waste gas. The initial investment and operating costs of absorption technology are low, but the absorbent needs to be replaced frequently, which may cause secondary pollution.

The adsorption method refers to the adsorption of organic waste gas on the adsorbent through the adsorption material, and then plays the role of adsorbing organic waste gas. The adsorption method has the advantages of high waste gas treatment efficiency and cleanliness. However, the adsorption method requires huge equipment, and the adsorption process is slow and complicated, and it is easy to fail due to the adsorption of water vapor in the air.

The condensation recovery method is aimed at the characteristics of different saturations of organic substances under different temperature conditions. By changing the pressure of the system, the organic substances in the organic waste gas are extracted by condensation. The condensation recovery method can improve the purity of the purification, but its operation is relatively difficult, and it is generally not possible to use cooling water in a normal temperature environment, and it is also necessary to use condensed water to cool down the process, which increases the cost of work.

Through the analysis of the characteristics of recovery technology, it can be seen that due to the low concentration and high flow rate of organic waste gas, the construction cost of the recovery device is high, and the operating cost is high. Therefore, the application of this method is economically restricted, and it is rarely used in practical applications. The development of destruction technology is the main direction of organic waste gas treatment.

In the destruction-type organic waste gas treatment technology, the combustion method converts organic waste gas into carbon dioxide and water through combustion. The combustion method is simple to operate, but when dealing with low-concentration and high-flow organic waste gas, a large amount of clean fuel is required for accompanying combustion, resulting in huge energy loss, low applicable calorific value, and sometimes a safety risk of explosion.

The main principle of low-temperature plasma technology to treat organic waste gas is to use the plasma generated by dielectric discharge to bombard the gas molecules in the waste gas repeatedly at a very fast speed under a high electric field strength, deactivate, ionize, and crack the various pollutants in the waste gas. Composition, destroying the structure of organic waste gas molecules, and through a series of complex chemical reactions such as oxidation, complex macromolecular pollutants are transformed into some small molecular safe substances. The device of low-temperature plasma technology is simple and easy to operate, but it is easy to cause secondary pollution during the discharge process.

The principle of biological treatment technology is to pass the organic waste generated in chemical enterprises through an absorption device with a liquid absorbent, in which special domesticated microorganisms are cultivated, which can decompose and metabolize the waste gas, so as to achieve the goal of waste gas treatment Purpose. This method has the advantages of good treatment effect and no secondary pollution, but the microorganisms of the biological treatment method are not easy to cultivate, and the equipment investment is large, the treatment time is long and the treatment capacity is limited, and the organic waste gas with high concentration and complex components is not suitable for use. the Act.

Contents of the invention

The object of the present invention is to overcome the shortcomings and deficiencies of the above-mentioned prior art, and to provide a method and device for swirling purification of organic waste gas by zonal oxidation. It can not only achieve efficient purification of organic waste gas with different concentrations and different components, but also avoid the problems of insufficient contact and weak disturbance between organic waste gas and catalyst droplets in the current technology.

The present invention realizes through following technical scheme:

A swirl purification device for zoned oxidation of organic waste gas, comprising a swirl purification tower 3 and a catalytic absorbent recirculation system arranged at the bottom of the swirl purification tower 3;

The swirling flow purification tower 3 is arranged sequentially from bottom to top: catalytic absorber swirl atomization layer, ultraviolet zonal oxidation layer, waste gas absorption and demisting layer;

The catalytic absorbent recirculation system is used to provide the nano-titanium dioxide atomization liquid required for atomization to the catalytic absorbent cyclone atomization layer, and recover the nano-titanium dioxide slurry that falls back to the catalytic absorbent recirculation system under the action of gravity.

The swirl atomization layer of the catalytic absorber is: a swirl atomizer 10 arranged in an array and tangentially arranged above the organic waste gas inlet 6 of the swirl purification tower 3 to realize the atomization of nano-titanium dioxide liquid, and make it along the tangential circle spiral up;

The swirl atomizers 10 are distributed along the 3 peripheral walls of the swirl purification tower, and each layer of swirl atomizers 10 is located on the same plane as the 3 peripheral walls of the swirl purification tower.

The ultraviolet zonal oxidation layer is: an annular ultraviolet lamp 5 arranged along the inner wall of the cyclone purification tower 3; the annular ultraviolet lamp 5 is divided into multiple layers from top to bottom, and the wavelengths of the annular ultraviolet lamps 5 between layers are different.

The demisting layer for absorbing exhaust gas adopts a demister 2; the demister 2 is located above the ultraviolet partition oxidation layer, and the organic waste gas is degraded into _CO and H under the action of the ring-shaped ultraviolet lamp 5 and the atomized nano-titanium dioxide liquid. ₂ O small molecule gas, the purified gas is discharged through the exhaust port 1 after demister 2 removes moisture.

The outside of described annular ultraviolet lamp 5 is equipped with transparent ultraviolet lamp lampshade 4; The angle between the upper surface of ultraviolet lamp lampshade 4 and the inner wall of swirling flow purification tower 3 is 75 °, and the angle between the lower surface and the inner wall of swirling flow purification tower 3 is 90°.

The catalytic absorbent recirculation system includes the following components: a nano-titanium dioxide slurry storage tank 7 arranged at the bottom of the cyclone purification tower 3; an agitator 9 arranged in the nano-titanium dioxide slurry storage tank 7 for stirring the nano-titanium dioxide slurry; A nano-titanium dioxide slurry circulation pump 8 for sending the nano-titanium dioxide slurry into the cyclone atomizer 10 for atomization.

The wavelength of the ring ultraviolet lamp 5 is adjustable.

A method for purifying organic waste gas by zonal oxidation and cyclone, which comprises the following steps:

Step 1: Injection step of organic waste gas and catalyst

The nano-titanium dioxide slurry is sprayed into the cyclone purification tower in a tangential circular manner by the swirl atomizer 10; the organic waste gas enters the swirl purification tower 3 from the organic waste gas inlet 6 tangentially, and is fully mixed with the atomized nano-titanium dioxide slurry on the upper layer. Mixing and entraining each other, spiraling up;

Step 2: Partitioned oxidation of organic waste gas

Organic waste gas and atomized nano-titanium dioxide slurry are divided into different areas by ultraviolet lamp shades 4 when they spirally rise in the ring of the ultraviolet partition oxide layer; Purified and degraded into small molecule gases of CO ₂ and H ₂ O under the irradiation of

Step 3: The recovery step of nano-titanium dioxide slurry

After the organic waste gas and atomized nano-titanium dioxide slurry pass through the ultraviolet zonal oxide layer, the nano-titanium dioxide slurry falls back into the nano-titanium dioxide slurry storage tank 7 under the action of gravity, and the purified gas passes through the demister 2 after removing moisture. The exhaust port 1 discharges the cyclone purification tower 3 .

Compared with the prior art, the present invention has the following advantages and effects:

1. The swirling atomizer is used to atomize the nano-titanium dioxide slurry, which increases the contact area between the nano-titanium dioxide slurry and the organic waste gas and improves the catalytic efficiency.

2. The swirl atomizer is arranged in a tangential circle, so that the nano-titanium dioxide slurry rises spirally along the tangential circle, and pushes with the spirally rising organic waste gas, which increases the degree of disturbance between the organic waste gas and the catalyst, and improves the reaction rate. In addition, the spiral rise prolongs the swirl path between the organic waste gas and the catalyst, increases the contact rate between the organic waste gas and the catalyst, and improves the purification efficiency.

3. The lampshade of the ultraviolet lamp can not only divide the rising organic waste gas and the titanium dioxide slurry in different areas to realize partition oxidation, but also protect the ring-shaped ultraviolet lamp.

4. The ultraviolet lamps are layered and set to different wavelengths to realize the catalytic oxidation of organic waste gas in different wavelengths under ultraviolet lamps, and the purification is relatively sufficient.

Description of drawings

Fig. 1 is a schematic structural diagram of an organic waste gas zoned oxidation cyclone purification device of the present invention.

Figure 2 is a schematic diagram of the tangential circle layout of the swirl atomizer.

Figure 3 is a schematic diagram of the inlet of organic waste gas.

Detailed ways

The present invention will be described in further detail below in conjunction with specific embodiments.

Example

As shown in Figures 1 to 3. The invention discloses a swirl purification device for zonal oxidation of organic waste gas, which comprises a swirl purification tower 3 and a catalytic absorbent recirculation system arranged at the bottom of the swirl purification tower 3;

The swirling flow purification tower 3 is arranged sequentially from bottom to top: catalytic absorber swirl atomization layer, ultraviolet zonal oxidation layer, waste gas absorption and demisting layer;

The catalytic absorbent recirculation system is used to provide the nano-titanium dioxide atomization liquid required for atomization to the catalytic absorbent cyclone atomization layer, and recover the nano-titanium dioxide slurry that falls back to the catalytic absorbent recirculation system under the action of gravity.

The swirl atomization layer of the catalytic absorber is: a swirl atomizer 10 arranged in an array and tangentially arranged above the organic waste gas inlet 6 of the swirl purification tower 3 to realize the atomization of nano-titanium dioxide liquid, and make it along the tangential circle spiral up;

The cyclone atomizers 10 are distributed (symmetrically) along the 3 peripheral walls of the cyclone purification tower, and each layer of cyclone atomizers 10 is located on the same plane of the 3 peripheral walls of the cyclone purification tower.

The ultraviolet zonal oxidation layer is: an annular ultraviolet lamp 5 arranged along the inner wall of the cyclone purification tower 3; the annular ultraviolet lamp 5 is divided into multiple layers from top to bottom, and the wavelengths of the annular ultraviolet lamps 5 between layers are different.

The demisting layer for absorbing exhaust gas adopts a demister 2; the demister 2 is located above the ultraviolet partition oxidation layer, and the organic waste gas is degraded into _CO and H under the action of the ring-shaped ultraviolet lamp 5 and the atomized nano-titanium dioxide liquid. ₂ O small molecule gas, the purified gas is discharged through the exhaust port 1 after demister 2 removes moisture.

The outside of described annular ultraviolet lamp 5 is equipped with transparent ultraviolet lamp lampshade 4; The angle between the upper surface of ultraviolet lamp lampshade 4 and the inner wall of swirling flow purification tower 3 is 75 °, and the angle between the lower surface and the inner wall of swirling flow purification tower 3 is 90°. The lampshade 4 of the ultraviolet lamp can not only divide the rising organic waste gas and the titanium dioxide slurry into different areas to realize regional oxidation, but also protect the ring-shaped ultraviolet lamp.

The catalytic absorbent recirculation system includes the following components: a nano-titanium dioxide slurry storage tank 7 arranged at the bottom of the cyclone purification tower 3; an agitator 9 arranged in the nano-titanium dioxide slurry storage tank 7 for stirring the nano-titanium dioxide slurry; A nano-titanium dioxide slurry circulation pump 8 for sending the nano-titanium dioxide slurry into the cyclone atomizer 10 for atomization.

The wavelength of the ring-shaped ultraviolet lamp 5 is adjustable, and can be adjusted online according to the specific application process.

The method for purifying organic waste gas by zonal oxidation and swirl flow in the present invention can be realized through the following steps:

Step 1: Injection step of organic waste gas and catalyst

The nano-titanium dioxide slurry is sprayed into the cyclone purification tower in a tangential circular manner by the swirl atomizer 10; the organic waste gas enters the swirl purification tower 3 from the organic waste gas inlet 6 tangentially, and is fully mixed with the atomized nano-titanium dioxide slurry on the upper layer. Mixing and entraining each other, spiraling up;

Step 2: Partitioned oxidation of organic waste gas

Organic waste gas and atomized nano-titanium dioxide slurry are divided into different areas by ultraviolet lamp shades 4 when they spirally rise in the ring of the ultraviolet partition oxide layer; Purified and degraded into small molecule gases of CO ₂ and H ₂ O under the irradiation of

Step 3: The recovery step of nano-titanium dioxide slurry

After the organic waste gas and atomized nano-titanium dioxide slurry pass through the ultraviolet zonal oxide layer, the nano-titanium dioxide slurry falls back into the nano-titanium dioxide slurry storage tank 7 under the action of gravity, and the purified gas passes through the demister 2 after removing moisture. The exhaust port 1 discharges the cyclone purification tower 3 .

As described above, the present invention can be preferably carried out.

The implementation of the present invention is not limited by the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods, and are all included in within the protection scope of the present invention.

Claims (1)

1. A method for purifying organic waste gas by zonal oxidation swirl, characterized in that, it is realized by using an organic waste gas zonal oxidation swirl purification device; The organic waste gas zonal oxidation swirl purification device includes a swirl purification tower (3) and a catalytic absorbent recirculation system arranged at the bottom of the swirl purification tower (3); The swirling flow purification tower (3) is arranged sequentially from bottom to top: catalytic absorber swirling atomization layer, ultraviolet zonal oxidation layer, waste gas absorption and demisting layer; The catalytic absorbent recirculation system is used to provide the nano-titanium dioxide atomization liquid required for atomization to the catalytic absorbent cyclone atomization layer, and recover the nano-titanium dioxide slurry that falls back to the catalytic absorbent recirculation system under the action of gravity; The cyclone atomization layer of the catalytic absorber is: a cyclone atomizer (10) arranged in an array and tangentially arranged above the organic waste gas inlet (6) of the cyclone purification tower (3) to realize the mist of nano-titanium dioxide liquid and make it spiral up along the tangential circle; The swirl atomizers (10) are distributed along the peripheral wall of the swirl purification tower (3), and each layer of swirl atomizers (10) is located on the same plane as the peripheral wall of the swirl purification tower (3); The ultraviolet zonal oxide layer is: an annular ultraviolet lamp (5) arranged along the inner wall of the swirl purification tower (3); the annular ultraviolet lamp (5) is divided into multiple layers from top to bottom, and the annular ultraviolet lamp between layers (5) The wavelengths are different; The demisting layer for absorbing waste gas adopts a demister (2); Degraded into CO ₂ and H ₂ O small molecule gas, the purified gas is discharged through the exhaust port (1) after demister (2) removes moisture; A transparent ultraviolet lamp shade (4) is installed on the outside of the annular ultraviolet lamp (5); the angle between the upper surface of the ultraviolet lamp shade (4) and the inner wall of the cyclone purification tower (3) is 75°, and the lower surface and the inner wall of the cyclone purification tower (3) The included angle of the inner wall of the flow purification tower (3) is 90°; The catalytic absorbent recirculation system includes the following components: A nano-titanium dioxide slurry storage tank (7) arranged at the bottom of the cyclone purification tower (3); A stirrer (9) for stirring the nano-titanium dioxide slurry is set in the nano-titanium dioxide slurry storage tank (7); A nano-titanium dioxide slurry circulation pump (8) for sending the nano-titanium dioxide slurry into the cyclone atomizer (10) for atomization; The wavelength of the ring-shaped ultraviolet lamp (5) is adjustable; The method for purifying organic waste gas by zonal oxidation and cyclone includes the following steps: Step 1: Injection step of organic waste gas and catalyst The nano-titanium dioxide slurry is sprayed into the cyclone purification tower in a tangential circle by the cyclone atomizer (10); the organic waste gas enters the cyclone purification tower (3) tangentially from the organic waste gas inlet (6), and the atomization of the upper layer The final nano-titanium dioxide slurry is fully mixed and entrained with each other, spiraling up; Step 2: Partitioned oxidation of organic waste gas Organic waste gas and atomized nano-titanium dioxide slurry are divided into different areas by the ultraviolet lamp shade (4) when spiraling up in the ring of the ultraviolet zoned oxide layer; organic waste gas forms different areas and different wavelengths between layers Purified and degraded into CO ₂ and H ₂ O small molecule gases under the irradiation of ultraviolet lamp; Step 3: The recovery step of nano-titanium dioxide slurry Organic waste gas and atomized nano-titanium dioxide slurry, after passing through the ultraviolet ray to partition the oxide layer, the nano-titanium dioxide slurry falls back into the nano-titanium dioxide slurry storage tank (7) under the action of gravity, and the purified gas passes through the demister (2) After the water is removed, it is discharged from the cyclone purification tower (3) through the exhaust port (1).

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