CN107158945B - Purification system and purification method for removing VOC in industrial waste gas - Google Patents

Purification system and purification method for removing VOC in industrial waste gas Download PDF

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CN107158945B
CN107158945B CN201710594939.9A CN201710594939A CN107158945B CN 107158945 B CN107158945 B CN 107158945B CN 201710594939 A CN201710594939 A CN 201710594939A CN 107158945 B CN107158945 B CN 107158945B
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adsorbent
placing cavity
waste gas
industrial waste
purification system
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CN107158945A (en
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刘扬
杨盛华
周殷伟
周刚
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Chongqing Positive Environmental Protection Polytron Technologies Inc
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Abstract

The invention discloses a purification system and a purification method for removing VOC in industrial waste gas, which solve the problems of high construction cost, large occupied area, non-ideal treatment effect and the like of industrial waste gas VOC treatment devices and methods commonly adopted in China in the prior art. The invention comprises an adsorbent placing cavity with a gas inlet and a gas outlet, and an adsorbent arranged in the adsorbent placing cavity; the gas inlet of the adsorbent placing cavity is positioned at the bottom of the adsorbent placing cavity, and the gas outlet is positioned at the top end of the adsorbent placing cavity; the outer wall of the adsorbent placing cavity is coated with a photocatalyst, and the adsorbent placing cavity is also provided with a cover body covering the adsorbent placing cavity; and a sealing cavity is formed between the outer wall of the adsorbent placing cavity and the cover body, and an exhaust port is formed in the bottom end of the cover body. The invention has the advantages of low cost, small floor area, good treatment effect and the like.

Description

Purification system and purification method for removing VOC in industrial waste gas
Technical Field
The invention relates to the field of gas purification, in particular to a purification system for removing VOC in industrial waste gas.
Background
VOC is an acronym for Volatile Organic Compounds (Volatile Organic Compounds) that excludes CO, CO2、H2CO3Any carbon compound participating in atmospheric photochemical reaction, including formaldehyde, ammonia, ethylene glycol, esters, and the like. When the VOC reaches a certain concentration, symptoms such as headache, nausea, vomiting, hypodynamia and the like can be caused, even convulsion and coma can be caused in severe cases, and the liver, the kidney, the brain and the nervous system can be injured, so that serious consequences such as hypomnesis and the like can be caused. Therefore, how to treat VOC is a subject of continuous research and development and exploration at home and abroad in recent years.
At present, the treatment means and research contents for VOC at home and abroad present different current situations, and mainly comprise means such as an adsorption method, a solvent absorption method, a thermal destruction method, a biological treatment method, a photocatalysis method, a plasma technology, a membrane separation method and the like.
(1) An adsorption method: the adsorption method in the organic waste gas is mainly suitable for low-concentration and high-flux organic waste gas. At present, the method for treating the organic waste gas is quite mature, has the advantages of low energy consumption, high treatment efficiency and the like, but the method also has the defects of large equipment volume, complex process flow and the key point of treating the waste gas by using the method is the adsorbent.
(2) Solvent absorption method: the liquid solvent is used as an absorbent, so that harmful components in the waste gas are absorbed by the liquid, and the aim of purification is fulfilled.
(3) Thermal destruction method: the thermal destruction method is classified into a direct combustion method, a catalytic combustion method, and a concentrated combustion method. The destruction mechanism is oxidation, thermal cracking and thermal decomposition, thereby achieving the purpose of VOC treatment.
(4) Biological treatment method: the microorganisms are utilized to carry out digestion and metabolism on the pollutants in the waste gas, and the pollutants are converted into harmless water, carbon dioxide and other inorganic salts.
(5) Photocatalytic method: the photocatalyst nano particles are excited under the irradiation of light with certain wavelength to produce electron hole pairs, water adsorbed on the surface of the hole decomposition catalyst generates hydroxyl radicals, and electrons reduce oxygen around the electrons into active ion oxygen, so that the photocatalyst nano particles have extremely strong oxidation-reduction capability and destroy various pollutants on the surface of the photocatalyst.
(6) Plasma technology: the plasma field is enriched with a large number of active species, such as ions, electrons, excited atoms, molecules, radicals, etc., which dissociate contaminant molecules from small molecule species.
(7) Membrane separation method: separation of VOCs is performed using artificially synthesized membranes.
At present, industrial waste gas VOC treatment methods generally adopted in China have the defects of high construction cost, large occupied area, non-ideal treatment effect and the like.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the industrial waste gas VOC treatment device and method generally adopted in China in the prior art generally have the defects of high construction cost, large occupied area, non-ideal treatment effect and the like, and aims to provide a purification system for removing VOC in industrial waste gas and a method for purifying VOC by using the system.
The invention is realized by the following technical scheme:
a purification system for removing VOC in industrial waste gas comprises an adsorbent placing cavity with a gas inlet and a gas outlet, and an adsorbent arranged in the adsorbent placing cavity; the gas inlet of the adsorbent placing cavity is positioned at the bottom of the adsorbent placing cavity, and the gas outlet is positioned at the top of the adsorbent placing cavity;
the outer wall of the adsorbent placing cavity is coated with a photocatalyst, and the adsorbent placing cavity is also provided with a cover body covering the adsorbent placing cavity; a sealed cavity is formed between the outer wall of the adsorbent placing cavity and the cover body, and an exhaust port is formed at the bottom end of the cover body;
the top end of the adsorbent placing cavity is also provided with a spray head, the spray head is communicated with the liquid supply device through a liquid conveying pipeline penetrating through the sealed cavity, the liquid conveying pipeline is also provided with an ozone generator, and the bottom end of the adsorbent placing cavity is provided with a water outlet.
The invention can greatly improve the purification efficiency by combining the adsorption and photocatalysis modes, and can greatly reduce the occupied area by optimizing the structure of arranging the photocatalyst on the outer wall of the adsorbent placing cavity. In addition, the invention adopts the mode of an adsorbent and a photocatalyst, can be catalyzed by directly adopting light, can save energy sources on the whole, and has simple structure, relatively low construction cost and very obvious effect.
Further, the adsorbent comprises an upper adsorbent and a lower adsorbent, and the spray header is located between the upper adsorbent and the lower adsorbent. The lower layer adsorbent comprises activated carbon fiber, TenaxTA and activated carbon particles. The upper adsorbent comprises a calcium oxide adsorption layer, a zeolite molecular sieve and a bentonite adsorption layer which are sequentially arranged from bottom to top.
Through the optimization setting of above-mentioned adsorbent, not only can reach the purpose of repeated regeneration, reduce cost, through the optimization cooperation of different kinds of adsorbents moreover, can greatly improve adsorption effect, improve exhaust-gas treatment effect.
In order to better improve the adsorption effect, a baffle plate which forms a spiral flow channel around the adsorbent placing cavity is arranged in the seal cavity, one side of the baffle plate is fixed on the outer wall of the adsorbent placing cavity, and a sealing gasket is arranged on the baffle plate on the other side. The spiral flow channel surrounds the sorbent placement chamber at least two times. And a conical reserved cavity is arranged at the position of a gas inlet in the adsorbent placing cavity.
In order to facilitate the replacement of the photocatalyst and the adsorbent in the cover body, the cover body consists of two sub cover bodies through connecting bolts.
Preferably, the liquid in the liquid supply device is water, and the water further comprises FeCl3The FeCl3The concentration of (A) is 3-5%. Through this setting, can realize secondary absorbent function better after desorption lower floor's absorbent VOC, the effect is very showing.
The invention also provides a purification method of the purification system for removing VOC in the industrial waste gas, which comprises the following steps:
(1) waste gas enters the adsorbent placing cavity through the gas inlet, and enters the sealed cavity after being adsorbed by the adsorbent;
(2) the gas entering the sealed cavity is subjected to catalytic action by the photocatalyst and then is discharged through the exhaust port.
Through the action of the steps, the VOC in the industrial waste gas can be effectively removed, and the effect is obvious.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. according to the invention, the adsorption and photocatalysis modes are combined, so that the purification efficiency can be greatly improved, and the occupied area can be greatly reduced by optimizing the structure of arranging the photocatalyst on the outer wall of the adsorbent placing cavity;
2. the invention adopts the mode of an adsorbent and a photocatalyst, can be catalyzed by directly adopting light, can save energy sources on the whole, and has simple structure, relatively low construction cost and very obvious effect;
3. the invention has simple structure, convenient operation, low cost and good effect, and is very suitable for popularization and application.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is an external structural view of the present invention.
Reference numbers and corresponding part names in the drawings:
the method comprises the following steps of 1-adsorbent placing cavity, 2-water outlet, 3-photocatalyst, 4-cover body, 5-exhaust port, 6-spray head, 7-baffle, 8-sealing gasket and 9-conical reserved cavity.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1
The purification system for removing VOC in industrial waste gas comprises an adsorbent placing cavity 1 with a gas inlet and a gas outlet, and an adsorbent arranged in the adsorbent placing cavity 1, wherein the adsorbent in the adsorbent placing cavity 1 in the embodiment is composed of activated carbon fibers, the diameter of each activated carbon fiber is 15-20 mu m, and the specific surface area is 1000-1500 m on average2(ii) in terms of/g. As shown in fig. 2, the gas inlet of the adsorbent placing chamber 1 is located at the bottom end of the adsorbent placing chamber 1, and the gas outlet is located at the top end of the adsorbent placing chamber 1.
The outer wall of the adsorbent placing cavity 1 is coated with a photocatalyst 3, and the adsorbent placing cavity 1 is also provided with a cover body 4 covering the adsorbent placing cavity 1; a sealed cavity is formed between the outer wall of the adsorbent placing cavity 1 and the cover body 4, and an exhaust port 5 is arranged at the bottom end of the cover body 4; the cover 4 in this embodiment is made of a material having a good light transmittance, such as glass or PVC.
The top end of the adsorbent placing cavity 1 is also provided with a spray header 6, the spray header 6 is communicated with a liquid supply device through a liquid conveying pipeline penetrating through the sealed cavity, the liquid conveying pipeline is also provided with an ozone generator, and the bottom end of the adsorbent placing cavity 1 is provided with a water outlet 2.
During the use, waste gas enters into the adsorbent from the gaseous entry in bottom that the chamber was placed to the adsorbent and places chamber 1, and waste gas places the absorption filtration back in chamber 1 through the adsorbent, and the gas outlet discharge that places chamber 1 top from the adsorbent enters into seal chamber, and waste gas is after the 3 catalysis of photocatalyst through in the seal chamber, and it can to discharge from the gas vent 5 of seal chamber bottom.
When the adsorbent in the adsorbent placing cavity 1 is saturated, the desorption liquid in the liquid supply device is sprayed into the adsorbent by adopting a liquid conveying pipeline, and the desorption operation of the adsorbent is realized by adopting the desorption liquid, wherein the desorption liquid can be water or other types of reagents; in this embodiment the desorption liquid is water.
In order to achieve the best desorption effect, the infusion pipeline is also connected with an ozone generator, so that the desorption operation is effectively improved, and the adsorption effect of the adsorbent after desorption is effectively improved.
Example 2
The difference between this embodiment and embodiment 1 is that the internal structure of the adsorbent placing chamber 1 and the flow channel arrangement mode of the sealed chamber are optimized in this embodiment, and the specific arrangement is as follows:
the adsorbent comprises an upper adsorbent and a lower adsorbent, and the spray header 6 is positioned between the upper adsorbent and the lower adsorbent. The lower layer adsorbent comprises activated carbon fibers, TenaxTA and activated carbon particles; the specific composition of the lower adsorbent in this example is: the activated carbon fiber, the TenaxTA and the activated carbon particles are 8: 3: 1 are uniformly mixed and then are arranged in the adsorbent placing cavity 1. The upper adsorbent comprises a calcium oxide adsorption layer, a zeolite molecular sieve and a bentonite adsorption layer which are sequentially arranged from bottom to top. A conical reserve cavity 9 is arranged at the position of a gas inlet in the adsorbent placing cavity 1, as shown in fig. 1.
In the embodiment, the diameter of the activated carbon particles is 12-15 mm, and the specific surface area is 830m2(ii) in terms of/g. The diameter of the activated carbon fiber is 15-20 μm, and the ratioThe average surface area is 1000-1500 m2/g。
A baffle 7 which forms a spiral flow channel around the adsorbent placing cavity 1 is arranged in the sealing cavity, one side of the baffle 7 is fixed on the outer wall of the adsorbent placing cavity 1, and a sealing gasket 8 is arranged on the baffle 7 on the other side. The spiral flow path surrounds the adsorbent placing chamber 1 at least two times, and the number of rotations of the spiral flow path is set to three times in this embodiment, as shown in fig. 2.
Example 3
The difference between this embodiment and embodiment 2 is that the cover 4 in this embodiment is composed of two sub covers via connecting bolts. The connecting line of the two sub-shields coincides with the longitudinal section line on the shield 4, as shown in fig. 2.
Example 4
This embodiment is a comparative example of the present invention, and is specifically configured as follows:
comparative example 1: the present comparative example is different from example 2 in that the cover 4 in the present comparative example is made of a light-impermeable material.
Comparative example 2: the comparative example differs from example 2 in that the baffle 7 is not provided in the cover 4.
Comparative example 3: the comparative example differs from example 1 in that a baffle 7 is further provided in the cover 4 in the comparative example.
The gas compositions at the positions of the exhaust ports 5 were detected by the same exhaust gas detection, and the detection results are shown in table 1.
TABLE 1
Figure BDA0001355657660000051
Through the detection, the optimized scheme of the invention, especially the scheme in the embodiment 2, can effectively remove the VOC in the waste gas, and the removal effect is optimal.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (10)

1. A purification system for removing VOC in industrial waste gas comprises an adsorbent placing cavity (1) with a gas inlet and a gas outlet, and an adsorbent arranged in the adsorbent placing cavity (1); the device is characterized in that a gas inlet of the adsorbent placing cavity (1) is positioned at the bottom of the adsorbent placing cavity (1), and a gas outlet is positioned at the top of the adsorbent placing cavity (1);
the outer wall of the adsorbent placing cavity (1) is coated with a photocatalyst (3), and the adsorbent placing cavity (1) is also provided with a cover body (4) covering the adsorbent placing cavity (1); a sealed cavity is formed between the outer wall of the adsorbent placing cavity (1) and the cover body (4), and an exhaust port (5) is formed at the bottom end of the cover body (4);
the inside top of chamber (1) is placed to the adsorbent still is provided with shower head (6), and this shower head (6) are through the infusion pipeline that passes sealed cavity and supply liquid device intercommunication, still be provided with ozone generator on the infusion pipeline, the chamber (1) bottom is placed to the adsorbent is provided with delivery port (2).
2. The purification system for removing VOC in industrial waste gas as claimed in claim 1, wherein said adsorbent comprises an upper adsorbent and a lower adsorbent, and said spray header (6) is located between said upper adsorbent and said lower adsorbent.
3. The purification system for removing VOC in industrial waste gas as claimed in claim 2, wherein said lower adsorbent layer comprises activated carbon fiber, TenaxTA, activated carbon particles.
4. The purification system for removing VOC in industrial waste gas as claimed in claim 2, wherein said upper adsorbent comprises a calcium oxide adsorption layer, a zeolite molecular sieve and a bentonite adsorption layer arranged in sequence from bottom to top.
5. A purification system for removing VOC from industrial waste gas according to claim 1, wherein a baffle (7) forming a spiral flow path around the adsorbent placing chamber (1) is provided in the sealed chamber, one side of the baffle (7) is fixed on the outer wall of the adsorbent placing chamber (1), and a sealing gasket (8) is provided on the other side of the baffle (7).
6. A purification system for VOC removal from industrial waste gas as claimed in claim 5, characterized in that said spiral flow channel surrounds the adsorbent placing chamber (1) at least two times.
7. A purification system for removing VOC from industrial waste gas according to claim 1, wherein a conical reserve chamber (9) is provided at a gas inlet position in said adsorbent placing chamber (1).
8. A purification system for removing VOC from industrial waste gas according to claim 1, wherein said cover body (4) is composed of two sub-cover bodies by means of connecting bolts.
9. The purification system for removing VOC in industrial waste gas as claimed in claim 1, wherein said liquid in said liquid supply means is water.
10. The purification method of a purification system for removing VOC from industrial waste gas according to any one of claims 1 to 9, comprising:
(1) waste gas enters the adsorbent placing cavity through the gas inlet, and enters the sealed cavity after being adsorbed by the adsorbent;
(2) the gas entering the sealed cavity is subjected to catalytic action by the photocatalyst and then is discharged through the exhaust port.
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