CN107051195B - Organic waste gas partition oxidation cyclone purification method and device - Google Patents
Organic waste gas partition oxidation cyclone purification method and device Download PDFInfo
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- CN107051195B CN107051195B CN201710377716.7A CN201710377716A CN107051195B CN 107051195 B CN107051195 B CN 107051195B CN 201710377716 A CN201710377716 A CN 201710377716A CN 107051195 B CN107051195 B CN 107051195B
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
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- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
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- B01D—SEPARATION
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/96—Regeneration, reactivation or recycling of reactants
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- B01D2255/20707—Titanium
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- B—PERFORMING OPERATIONS; TRANSPORTING
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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
Technical Field
The invention relates to organic waste gas purification, in particular to a method and a device for purifying organic waste gas by partition oxidation cyclone.
Background
Along with the rapid development of economy of China, the organic waste gas pollution problem is increasingly serious in recent years, the haze days in many regions are continuously increased, and the normal life and health of people are seriously influenced. More and more scholars are beginning to research on the treatment of organic waste gas pollution and develop a plurality of effective treatment methods. The research on the organic waste gas pollution treatment technology can create a good living environment for the society and improve the life quality of people on one hand; on the other hand, environmental protection treatment measures can be provided for enterprises, and the industrial sustainable development capability is improved.
The organic waste gas mainly comes from the industries of petrochemical industry, pharmacy, paint, printing and the like. The organic waste gas is mainly aromatic hydrocarbon, alcohol, halogenated hydrocarbon, aldehyde, ketone, etc. At present, the treatment methods of organic waste gas can be totally divided into two types, one is a recovery technology, and the other is a destruction technology. Conventional recycling techniques include: absorption technology, adsorption technology, condensation recovery technology and the like. The traditional destroying technology mainly refers to combustion technology. The new technology of destroying developed in recent years includes low temperature plasma technology, biotechnology, photocatalysis and other technologies.
The recovery technology has the following characteristics:
the absorption method is mainly characterized in that organic waste gas is fully contacted with an absorbent, so that harmful molecules in the organic waste gas are absorbed by the absorbent, and the effect of purifying the organic waste gas is achieved. The initial investment and running cost of the absorption technology are low, but the absorbent needs to be replaced frequently, and secondary pollution can be generated.
The adsorption method is a method in which an adsorbent adsorbs organic waste gas to an adsorbent, thereby adsorbing the organic waste gas. The adsorption method has the advantages of high waste gas treatment efficiency, cleanness and the like, but the adsorption method has huge equipment and slow and complex adsorption process and is easy to lose effectiveness due to the adsorption of water vapor in air.
The condensation recovery method is a method for refining organic substances in organic waste gas in a condensation mode by changing the pressure of a system according to the characteristic that organic substances have different saturation degrees under different temperature conditions. The condensation recovery method can improve the purity of purification, but its operation degree of difficulty is great relatively, generally can not utilize the cooling water to realize in normal atmospheric temperature environment, still need utilize the comdenstion water cooling process, increases the cost of work.
Analysis on the technical characteristics of recovery type shows that the recovery device has high construction cost and high operating cost under the condition of low concentration and high flow of the organic waste gas, so that the application of the method is limited in economy and less in practical application. 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 by combustion. The combustion method is simple to operate, but when the organic waste gas with low concentration and large flow rate is treated, a large amount of clean fuel is needed for combustion, the energy loss is huge, the applicable calorific value is low, and sometimes the safety risk of explosion is generated.
The main principle of treating organic waste gas by low-temperature plasma technology is that under high electric field intensity, gas molecules in the waste gas are bombarded repeatedly at a very high speed by plasma generated by dielectric discharge, various components in the waste gas are deactivated, ionized and cracked, the structure of the organic waste gas molecules is damaged, and complex macromolecular pollutants are converted into some micromolecular safe substances through a series of complex chemical reactions such as oxidation and the like. The device of the low-temperature plasma technology is simple and easy to operate, but secondary pollution is easily caused in the discharging process.
The principle of the biological treatment technology is that organic waste gas produced in chemical enterprises flows through an absorption device with a liquid absorbent, and domesticated special microorganisms are cultured in the device and can decompose and metabolize the waste gas, so that the aim of waste gas treatment is fulfilled. The method has the advantages of good treatment effect, no secondary pollution and the like, but microorganisms in the biological treatment method are not easy to culture, the equipment investment is large, the treatment time is long, the treatment amount is limited, and the organic waste gas with high concentration and complex components is not suitable for adopting the method.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a cyclone purification method and a cyclone purification device for organic waste gas by zone oxidation. The method can realize the high-efficiency purification of the organic waste gas with different concentrations and different components, and can also avoid the problems of insufficient contact and weak disturbance of the organic waste gas and catalyst liquid drops in the prior art.
The invention is realized by the following technical scheme:
a rotational flow purification device for organic waste gas partition oxidation comprises a rotational flow purification tower 3 and a catalytic absorbent recirculation system arranged at the bottom of the rotational flow purification tower 3;
the cyclone purification tower 3 is internally provided with the following components from bottom to top in sequence: the device comprises a catalytic absorbent cyclone atomizing layer, an ultraviolet ray partition oxidation layer and an exhaust gas absorption defogging layer;
the catalytic absorbent recycling system is used for providing nano titanium dioxide atomized liquid required by atomization for the cyclone atomized 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 catalytic absorbent rotational flow atomization layer is as follows: adopting a cyclone atomizer 10 which is arranged above an organic waste gas inlet 6 of a cyclone purification tower 3 in an array and tangent circle manner to realize the atomization of the nano titanium dioxide liquid and make the nano titanium dioxide liquid spirally rise along the tangent circle;
the swirl atomizers 10 are distributed along the circumferential wall of the swirl purification tower 3, and each layer of swirl atomizers 10 is positioned on the same plane of the circumferential wall of the swirl purification tower 3.
The ultraviolet ray partition oxide layer is as follows: an annular ultraviolet lamp 5 arranged along the inner wall of the rotational flow purification tower 3; the annular ultraviolet lamps 5 are divided into a plurality of layers from top to bottom, and the wavelength of the annular ultraviolet lamps 5 between the layers is different.
The exhaust gas absorption demisting layer adopts a demister 2; the demister 2 is positioned above the ultraviolet ray partition oxide layer, and organic waste gas is degraded into CO under the action of the annular ultraviolet lamp 5 and the atomized nano titanium dioxide liquid 2 And H 2 The purified gas is discharged through the demister 2 after moisture is removed and then is discharged through the exhaust port 1.
A transparent ultraviolet lamp shade 4 is arranged outside the annular ultraviolet lamp 5; the upper surface of ultraviolet lamp shade 4 and the contained angle of 3 inner walls of whirl purifying tower are 75, and the contained angle of lower surface and 3 inner walls of whirl purifying tower is 90.
The catalytic absorber recirculation system comprises the following components: a nano titanium dioxide slurry storage tank 7 arranged at the bottom of the cyclone purification tower 3; a stirrer 9 arranged in the nano titanium dioxide slurry storage tank 7 and used for stirring the nano titanium dioxide slurry; and a nano titanium dioxide slurry circulating pump 8 for feeding the nano titanium dioxide slurry into the cyclone atomizer 10 for atomization.
The wavelength of the annular ultraviolet lamp 5 is adjustable.
A method for purifying organic waste gas by partition oxidation cyclone comprises the following steps:
step one; organic waste gas and catalyst injection step
The nanometer titanium dioxide slurry is sprayed into the cyclone purification tower in a tangential circle mode by a cyclone atomizer 10; organic waste gas tangentially enters the cyclone purification tower 3 from the organic waste gas inlet 6, is fully mixed with the atomized nano titanium dioxide slurry on the upper layer, and is sucked by each other and rises spirally;
step two; organic waste gas sectional oxidation step
The organic waste gas and the atomized nano titanium dioxide slurry are spirally lifted in the ring of the ultraviolet ray partition oxide layer and are divided into different areas by the ultraviolet lamp shade 4; organic waste gas is purified and degraded into CO under the irradiation of ultraviolet lamps with different wavelengths in different areas formed among layers 2 And H 2 O small molecule gas;
step three; recovery step of nano titanium dioxide slurry
After the organic waste gas and the atomized nano titanium dioxide slurry pass through the ultraviolet ray partition 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 is discharged out of the cyclone purification tower 3 through the exhaust port 1 after moisture is removed by the demister 2.
Compared with the prior art, the invention has the following advantages and effects:
1. 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.
2. The cyclone atomizer adopts tangential circle arrangement, so that the nano titanium dioxide slurry spirally rises along the tangential circle and is mutually pushed with the spirally rising organic waste gas, the disturbance degree of the organic waste gas and the catalyst is increased, and the reaction rate is improved. In addition, the spiral rising prolongs the rotational flow path of the organic waste gas and the catalyst, improves the contact rate of the organic waste gas and the catalyst, and improves the purification efficiency.
3. The ultraviolet lamp lampshade can divide the rising organic waste gas and the titanium dioxide slurry into different areas, so that the zoned oxidation is realized, and the function of protecting the annular ultraviolet lamp can be achieved.
4. The ultraviolet lamps are arranged into different wavelengths in a layered mode, so that the organic waste gas is subjected to zoned catalytic oxidation under the ultraviolet lamps with various wavelengths, and the purification is sufficient.
Drawings
FIG. 1 is a schematic structural view of a cyclone purification device for organic waste gas zone oxidation according to the present invention.
Fig. 2 is a schematic diagram of a tangential arrangement of the swirl atomizers.
Fig. 3 is a schematic view of an organic waste gas inlet.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
Examples
As shown in figures 1 to 3. The invention discloses an organic waste gas partition oxidation cyclone purification device, which comprises a cyclone purification tower 3 and a catalytic absorbent recirculation system arranged at the bottom of the cyclone purification tower 3;
the cyclone purification tower 3 is internally provided with the following components from bottom to top in sequence: the device comprises a catalytic absorbent cyclone atomizing layer, an ultraviolet ray partition oxidation layer and an exhaust gas absorption defogging layer;
the catalytic absorbent recycling system is used for providing nano titanium dioxide atomized liquid required by atomization for the cyclone atomized 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 catalytic absorbent rotational flow atomization layer is as follows: adopting a cyclone atomizer 10 which is arranged above an organic waste gas inlet 6 of a cyclone purification tower 3 in an array and tangent circle manner to realize the atomization of the nano titanium dioxide liquid and make the nano titanium dioxide liquid spirally rise along the tangent circle;
the swirl atomizers 10 are distributed (symmetrically) along the peripheral wall of the swirl purification tower 3, and each layer of swirl atomizers 10 is positioned on the same plane of the peripheral wall of the swirl purification tower 3.
The ultraviolet ray partition oxide layer is as follows: an annular ultraviolet lamp 5 arranged along the inner wall of the rotational flow purification tower 3; the annular ultraviolet lamps 5 are divided into a plurality of layers from top to bottom, and the wavelength of the annular ultraviolet lamps 5 between the layers is different.
The demister 2 is adopted in the waste gas absorbing and demisting layer; the demister 2 is arranged on the ultraviolet ray subarea oxidation layerThe organic waste gas is degraded into CO under the action of the annular ultraviolet lamp 5 and the atomized nano titanium dioxide liquid 2 And H 2 And O small molecule gas, wherein the purified gas is discharged through the demister 2 after moisture is removed, and then is discharged through the gas outlet 1.
A transparent ultraviolet lamp shade 4 is arranged outside the annular ultraviolet lamp 5; the upper surface of ultraviolet lamp shade 4 and the contained angle of 3 inner walls of whirl purifying tower are 75, and the contained angle of lower surface and 3 inner walls of whirl purifying tower is 90. The ultraviolet lamp shade 4 not only can divide the rising organic waste gas and the titanium dioxide slurry into different areas to realize the subarea oxidation, but also can play a role in protecting the annular ultraviolet lamp.
The catalytic absorber recirculation system comprises the following components: a nano titanium dioxide slurry storage tank 7 arranged at the bottom of the cyclone purification tower 3; a stirrer 9 arranged in the nano titanium dioxide slurry storage tank 7 and used for stirring the nano titanium dioxide slurry; and the nano titanium dioxide slurry circulating pump 8 is used for feeding the nano titanium dioxide slurry into the cyclone atomizer 10 for atomization.
The wavelength of the annular ultraviolet lamp 5 can be adjusted, and can be adjusted on line according to the specific application process.
The organic waste gas partition oxidation cyclone purification method can be realized by the following steps:
step one; organic waste gas and catalyst injection step
The nanometer titanium dioxide slurry is sprayed into the cyclone purification tower in a tangent circle mode by a cyclone atomizer 10; organic waste gas tangentially enters the cyclone purification tower 3 from the organic waste gas inlet 6, is fully mixed with the atomized nano titanium dioxide slurry on the upper layer, and is sucked by each other and rises spirally;
step two; organic waste gas zoned oxidation step
The organic waste gas and the atomized nano titanium dioxide slurry are spirally lifted in the ring of the ultraviolet ray partition oxide layer and are divided into different areas by the ultraviolet lamp shade 4; the organic waste gas is purified and degraded into CO under the irradiation of ultraviolet lamps with different wavelengths in different areas formed among layers 2 And H 2 O small molecule gas;
step three; recovery step of nano titanium dioxide slurry
After the organic waste gas and the atomized nano titanium dioxide slurry pass through the ultraviolet ray partition 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 is discharged out of the cyclone purification tower 3 through the exhaust port 1 after moisture is removed by the demister 2.
As described above, the present invention can be preferably realized.
The embodiments of the present invention are not limited to the above-described embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and they are included in the scope of the present invention.
Claims (1)
1. A method for purifying organic waste gas by partition oxidation cyclone is characterized in that the method is realized by adopting an organic waste gas partition oxidation cyclone purification device;
the organic waste gas partition oxidation cyclone purification device comprises a cyclone purification tower (3) and a catalytic absorbent recirculation system arranged at the bottom of the cyclone purification tower (3);
the cyclone purification tower (3) is internally provided with the following components in sequence from bottom to top: the device comprises a catalytic absorbent cyclone atomizing layer, an ultraviolet ray partition oxidation layer and an exhaust gas absorption defogging layer;
the catalytic absorbent recycling system is used for providing nano titanium dioxide atomized liquid required by atomization for the cyclone atomized 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 catalytic absorbent rotational flow atomization layer is as follows: a cyclone atomizer (10) which is arranged above an organic waste gas inlet (6) of a cyclone purification tower (3) in an array and tangent circle mode is adopted to realize atomization of the nano titanium dioxide liquid and enable the nano titanium dioxide liquid to spirally rise along the tangent circle;
the swirl atomizers (10) are distributed along the peripheral wall of the swirl purification tower (3), and each layer of swirl atomizer (10) is positioned on the same plane of the peripheral wall of the swirl purification tower (3);
the ultraviolet ray partition oxide layer is as follows: an annular ultraviolet lamp (5) arranged along the inner wall of the cyclone purification tower (3); the annular ultraviolet lamp (5) is divided into a plurality of layers from top to bottom, and the wavelength of the annular ultraviolet lamp (5) between the layers is different;
the exhaust gas absorption demisting layer adopts a demister (2); the demister (2) is positioned above the ultraviolet ray partition oxide layer, and the organic waste gas is degraded into CO under the action of the annular ultraviolet lamp (5) and the atomized nano titanium dioxide liquid 2 And H 2 O small molecular gas, wherein the purified gas is discharged through the gas outlet (1) after moisture is removed through the demister (2);
a transparent ultraviolet lamp shade (4) is arranged outside the annular ultraviolet lamp (5); the included angle between the upper surface of the ultraviolet lamp lampshade (4) and the inner wall of the rotational flow purification tower (3) is 75 degrees, and the included angle between the lower surface of the ultraviolet lamp lampshade and the inner wall of the rotational flow purification tower (3) is 90 degrees;
the catalytic absorber recirculation system comprises the following components:
a nano titanium dioxide slurry storage tank (7) arranged at the bottom of the cyclone purification tower (3);
a stirrer (9) arranged in the nano titanium dioxide slurry storage tank (7) and used for stirring the nano titanium dioxide slurry;
a nano titanium dioxide slurry circulating pump (8) for feeding the nano titanium dioxide slurry into the cyclone atomizer (10) for atomization;
the wavelength of the annular ultraviolet lamp (5) is adjustable;
the organic waste gas partition oxidation cyclone purification method comprises the following steps:
step one; organic waste gas and catalyst injection step
The nano titanium dioxide slurry is sprayed into the cyclone purification tower in a tangential circle mode by a cyclone atomizer (10); organic waste gas tangentially enters the cyclone purification tower (3) from the organic waste gas inlet (6), is fully mixed with the atomized nano titanium dioxide slurry on the upper layer, and is mutually sucked and spirally rises;
step two; organic waste gas zoned oxidation step
The organic waste gas and the atomized nano titanium dioxide slurry are spirally raised in a ring of the ultraviolet ray partition oxide layer and are divided into different areas by an ultraviolet lamp shade (4); the organic waste gas is purified and degraded into CO under the irradiation of ultraviolet lamps with different wavelengths in different areas formed among layers 2 And H 2 O small molecule gas;
step three; recovery step of nano titanium dioxide slurry
After the organic waste gas and the atomized nano titanium dioxide slurry pass through the ultraviolet ray partition 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 is discharged out of the cyclone purification tower (3) through the exhaust port (1) after moisture is removed by the demister (2).
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| CN107497249A (en) * | 2017-10-13 | 2017-12-22 | 山东佩森环保科技股份有限公司 | A kind of ship tail gas scrubbing tower |
| CN109126432B (en) * | 2018-11-05 | 2020-08-18 | 山东海嘉石油化工有限公司 | High-efficient desulfurization absorption tower |
| CN117085503B (en) * | 2023-10-19 | 2024-01-23 | 汇舸(南通)环保设备有限公司 | Intelligent desulfurization treatment spray device for purifying ship tail gas |
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| US5186907A (en) * | 1987-03-30 | 1993-02-16 | Mitsubishi Denki Kabushiki Kaisha | Apparatus for treating organic waste gas |
| EP1398066A2 (en) * | 1997-09-10 | 2004-03-17 | Brian Edward Butters | System for treating contaminated gas |
| CN102716666A (en) * | 2012-07-06 | 2012-10-10 | 重庆大学 | Purifying system for multi-phase photocatalysis treatment of waste gases |
| CN105498478A (en) * | 2015-12-31 | 2016-04-20 | 中山大学 | Method and device for purifying VOCs (Volatile Organic Compounds) through gas-phase photolysis and liquid-phase photocatalytic oxidation |
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