CN218871778U - Multiphase catalytic oxidation method exhaust treatment device - Google Patents
Multiphase catalytic oxidation method exhaust treatment device Download PDFInfo
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- CN218871778U CN218871778U CN202222744661.8U CN202222744661U CN218871778U CN 218871778 U CN218871778 U CN 218871778U CN 202222744661 U CN202222744661 U CN 202222744661U CN 218871778 U CN218871778 U CN 218871778U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The utility model relates to a VOCs waste gas treatment field provides a heterogeneous catalytic oxidation method exhaust treatment device, including active oxygen unit, first oxidation unit, second oxidation unit, first oxidation unit includes blender, first oxidation tower, first circulating pump, medicine storage tank, dosing pump, second oxidation unit includes second oxidation tower, second circulating pump, the active oxygen unit includes filter, governing valve, air-blower, the active oxygen generator that sets gradually according to the air flow direction. The waste gas can be thoroughly purified after multistage heterogeneous catalytic oxidation, and has the characteristics of good treatment effect, wide application range and high safety factor.
Description
Technical Field
The application relates to one of volatile organic waste gas (VOCs) processing devices, in particular to a waste gas processing device adopting a multiphase catalytic oxidation method, and belongs to the technical field of atmospheric pollution treatment.
Background
VOCs are short for volatile organic compounds, are main precursors formed by PM2.5 and ozone in the air, and have great harm to the environment. At present, industrial enterprises have a plurality of methods for treating VOCs by reducing emission, including an adsorption method, an absorption method, a combustion method, a biological method, a catalytic oxidation method and the like. However, each treatment method has advantages, disadvantages and application range, is limited by different VOCs waste gas emission conditions, and is difficult to thoroughly solve the emission reduction problem by a single process. Therefore, in order to avoid the limitation of a single treatment method, a combination technique combining a plurality of treatment methods is gradually becoming a trend.
Disclosure of Invention
The application provides a heterogeneous catalytic oxidation method exhaust treatment device, the device has combined the advantage of absorption method, adsorption method, catalytic oxidation method, to the thorough oxidative decomposition of the changeable VOCs waste gas of composition complex operating mode, reduces secondary pollution.
In order to achieve the above object, the technical solution of the present application is as follows.
The utility model provides a heterogeneous catalytic oxidation method exhaust treatment device, includes active oxygen unit, first oxidation unit, second oxidation unit, first oxidation unit includes blender, first oxidation tower, first circulating pump, medicine storage tank, dosing pump, the second oxidation unit includes second oxidation tower, second circulating pump, the active oxygen unit includes filter, governing valve, air-blower, the active oxygen generator that sets gradually according to the air flow direction, the blender entry is one and links to each other with VOCs waste gas source, the blender export with first oxidation tower entry links to each other, first oxidation tower export adopts the tuber pipe to be connected to the second oxidation tower entry.
The first oxidation tower comprises a first water collecting tank, a first gas distributor, a first catalysis layer, a first spray thrower and a first demister, wherein the first water collecting tank, the first gas distributor, the first catalysis layer, the first spray thrower and the first demister are arranged in the tower from bottom to top, a first aerator is arranged at the bottom of the first water collecting tank, the first water collecting tank is connected with the first spray thrower through a first circulating pump, the first water collecting tank is also connected with the medicine storage tank through a medicine feeding pump, and the first catalysis layer is filled with Fenton catalyst.
The second oxidation tower comprises a second water collecting tank, a second gas distributor, a second catalysis layer, a second sprayer, a second demister and a third catalysis layer which are arranged in the tower from bottom to top, the second aerator is arranged at the bottom of the second water collecting tank, the second water collecting tank is connected with the second sprayer through a second circulating pump, the second catalysis layer is filled with Fenton catalyst, and the third catalysis layer is filled with ozone catalyst.
The outlet of the active oxygen generator is respectively communicated with the second mixer inlet, the first aerator and the second aerator, and manual valves capable of adjusting flow are respectively arranged on the communicating pipes.
Further, the main active component in the Fenton catalyst is at least one of oxides of Fe, cu, al, ti and Re, and the main active component in the ozone catalyst is at least one of oxides of Cu, mn, ti, ce and Re.
Furthermore, the first water collecting tank is connected with the bottom of the second water collecting tank through a pipeline and a valve, a water outlet is formed in the bottom of the first water collecting tank, and a water replenishing port is formed in the second water collecting tank.
Further, the solution stored in the medicine storage tank is H 2 O 2 、NaOH、KOH、Na 2 S 2 O 8 、K 2 S 2 O 8 The first water collecting tank is also provided with a PH value on-line detector.
The beneficial effect of this application lies in: VOCs waste gas enters the mixer from the first inlet of the mixer, and is subjected to mixed reaction (gas-gas reaction) with active oxygen molecules generated by an active oxygen unit injected from the second inlet, then the mixture is discharged into the first oxidation tower, the VOCs waste gas entering the first oxidation tower is subjected to gas distribution and then rises from bottom to top to uniformly pass through the first catalyst layer, and is subjected to chemical reaction (gas-solid reaction) with an oxidant enriched on the surface of the catalyst, and pollutants are decomposed into micromolecular organic byproducts, CO 2 And H 2 O, atomizing and spraying the circulating liquid from top to bottom by the first sprayer, and carrying out countercurrent contact on the circulating liquid and the VOCs waste gas,the pollutants in the waste gas are absorbed by the circulating liquid (gas-liquid reaction), fall along with the gravity and are adsorbed by the catalyst, and react with the disproportionation electron cloud formed by the oxidant in a large mass transfer area, and OH and HO with high potential are excited on the surface of the catalyst 2 When the free radicals accelerate electron transfer at the interface, redox reaction (liquid-liquid reaction) of water molecules and organic matters is carried out, part of unreacted pollutants are continuously remained in the circulating liquid and continuously react with the oxidant dissolved in the circulating liquid, the waste gas containing the residual pollutants is demisted and then discharged out of the first oxidation tower to enter the second oxidation tower, the waste gas is continuously oxidized and purified again in the second oxidation tower, and when the waste gas passes through the third catalytic layer, redundant O generated by the reaction 3 Adsorbed by ozone catalyst and decomposed rapidly, and the generated OH free radicals react with pollutants again to generate CO 2 And H 2 O, discharging the clean gas from the top of the tower; therefore, VOCs waste gas has passed through gas-gas, gas-liquid, gas-solid, liquid-liquid multistage heterogeneous catalytic oxidation reaction, when the pollutant was thoroughly oxygenolysis, accomplished catalyst to the normal position absorption and the normal position regeneration of pollutant, compare in all the other processing technology, the device of this application can be on a large scale, high efficiency, no secondary pollution ground handles VOCs waste gas, in addition, because whole catalytic oxidation reaction is gone on under normal atmospheric temperature and pressure, the detonation risk that high concentration waste gas brought has been stopped, the device security is high, be applicable to class A blast resistant area and use.
Drawings
Fig. 1 is a schematic structural diagram of the present application.
The names of the components in the figure are identified as follows: 1. an active oxygen unit; 2. a first oxidation unit; 3. a second oxidation unit; 11. a filter; 12. adjusting a valve; 13. a blower; 14. an active oxygen generator; 21. a mixer; 22. a first oxidation tower; 221. a first aerator; 222. a first gas distributor; 223. a first catalytic layer; 224. a first sprayer; 225. a first demister; 23. a first circulation pump; 24. a medicine storage tank; 25. a dosing pump; 31. a second oxidation tower; 311. a second aerator; 312. a second gas distributor; 313. a second catalytic layer; 314. a second sprayer; 315. a second demister; 316. a third catalytic layer; 32. and a second circulation pump.
Detailed Description
The present application is further described with reference to the following examples in conjunction with the accompanying drawings.
As shown in fig. 1, a multiphase catalytic oxidation method exhaust gas treatment device comprises an active oxygen unit 1, a first oxidation unit 2 and a second oxidation unit 3, wherein the first oxidation unit 2 comprises a mixer 21, a first oxidation tower 22, a first circulating pump 23, a medicine storage tank 24 and a medicine feeding pump 25, the second oxidation unit 3 comprises a second oxidation tower 31 and a second circulating pump 32, the active oxygen unit 1 comprises a filter 11, an adjusting valve 12, a blower 13 and an active oxygen generator 14 which are sequentially arranged along the air flowing direction, an inlet of the mixer 21 is connected with a VOCs exhaust gas source, an outlet of the mixer 21 is connected with an inlet of the first oxidation tower 22, and an outlet of the first oxidation tower 22 is connected to an inlet of the second oxidation tower 31 by adopting an air pipe.
As shown in fig. 1, the first oxidation tower 22 includes a first water collecting tank disposed in the tower from bottom to top, a first gas distributor 222, a first catalyst layer 223, a first sprayer 224, and a first demister 225, a first aerator 221 is disposed at the bottom of the first water collecting tank, the first water collecting tank is connected to the first sprayer 224 through a first circulating pump 23, the first circulating pump 23 can continuously atomize and spray the circulating liquid in the first water collecting tank downward through the first sprayer 224 to humidify the first catalyst layer 223, the redundant circulating liquid flows back to the first water collecting tank by gravity, thereby forming a liquid phase circulation, the first water collecting tank is further connected to the drug storage tank 24 through a drug adding pump 25, and the first catalyst layer 223 is filled with fenton catalyst.
As shown in fig. 1, the second oxidation tower 31 includes a second water collecting tank, a second air distributor 312, a second catalyst layer 313, a second sprayer 314, a second demister 315, and a third catalyst layer 316, which are arranged from bottom to top in the tower, the second aerator 311 is arranged at the bottom of the second water collecting tank, the second water collecting tank and the second sprayer 314 are connected by a second circulating pump 32, the second catalyst layer 313 is filled with fenton catalyst, and the third catalyst layer 316 is filled with ozone catalyst.
As shown in figure 1, the outlet of the active oxygen generator 14 is respectively communicated with the inlet II of the mixer 21, the first aerator 221 and the second aerator 311, and the communicating pipes are respectively provided with a flow-adjustable pipeAmount of manual valve, active oxygen molecules (O) produced by active oxygen unit 1 2 + 、O 3 ) The oxidizing agent is continuously supplied to the reaction by being supplied to the VOCs off-gas through the mixer 21, and being supplied to the respective circulating liquid and VOCs off-gas through the first aerator 221 and the second aerator 311.
Specifically, as shown in fig. 1, the main active component in the fenton catalyst is at least one of oxides of Fe, cu, al, ti, and Re, and the main active component in the ozone catalyst is at least one of oxides of Cu, mn, ti, ce, and Re.
Specifically, as shown in fig. 1, the first water collecting tank is connected with the bottom of the second water collecting tank through a pipeline and a valve, a water outlet is arranged at the bottom of the first water collecting tank, a water replenishing port is arranged in the second water collecting tank, fresh water is replenished from the second water collecting tank by the device, water is drained from the first water collecting tank, and circulating liquid in the first water collecting tank is replenished from the second water collecting tank, so that the circulating liquid cost is reduced.
Specifically, referring to fig. 1, the solution stored in the drug storage tank 24 is H 2 O 2 、NaOH、KOH、Na 2 S 2 O 8 、K 2 S 2 O 8 At least one of the first water collecting tank and the second water collecting tank is also provided with a PH value on-line detector, and the dosing pump 23 can pump the solution stored in the medicine storage tank 24 into the circulating liquid in the first water collecting tank in a quantitative manner.
According to the device for treating waste gas by the heterogeneous catalytic oxidation method, VOCs waste gas passes through gas-gas, gas-liquid, gas-solid and liquid-liquid multi-stage heterogeneous catalytic oxidation reactions in the device, pollutants are oxidized and decomposed into carbon dioxide and water, organic matters containing halogen and heteroatoms are decomposed into carbon dioxide, water and final ionic state (example F) - 、Cl - 、NO 3 - Etc.) while in situ adsorption and regeneration of the catalyst for contaminants is accomplished. Compare in all the other processing technology, the device of this application can handle VOCs waste gas on a large scale, high efficiency, no secondary pollution ground, in addition, because whole catalytic oxidation reaction is gone on under normal atmospheric temperature and pressure, has stopped the detonation risk that high concentration waste gas brought, has improved the security of device.
It should be noted that the above-mentioned embodiments are only examples of the present application and are not intended to limit the scope of the claims of the present application, and any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the scope of the present application.
Claims (3)
1. A waste gas treatment device by a heterogeneous catalytic oxidation method is characterized by comprising an active oxygen unit, a first oxidation unit and a second oxidation unit, the first oxidation unit comprises a mixer, a first oxidation tower, a first circulating pump, a medicine storage tank and a medicine feeding pump, the second oxidation unit comprises a second oxidation tower and a second circulating pump, the active oxygen unit comprises a filter, a regulating valve, a blower and an active oxygen generator which are sequentially arranged along the air flowing direction, the first inlet of the mixer is connected with a VOCs waste gas source, the outlet of the mixer is connected with the inlet of the first oxidation tower, the outlet of the first oxidation tower is connected to the inlet of the second oxidation tower by an air pipe, the first oxidation tower comprises a first water collecting tank, a first air distributor, a first catalysis layer, a first sprayer and a first demister which are arranged in the tower from bottom to top, a first aerator is arranged at the bottom of the first water collecting tank, the first water collecting tank is connected with the first sprayer through the first circulating pump, the first water collecting tank is also connected with the medicine storage tank through the medicine adding pump, the first catalytic layer is filled with Fenton catalyst, the second oxidation tower comprises a second water collecting tank, a second gas distributor, a second catalyst layer, a second sprayer, a second demister and a third catalyst layer which are arranged in the tower from bottom to top, a second aerator is arranged at the bottom of the second water collecting tank, the second water collecting tank is connected with the second sprayer through the second circulating pump, the second catalytic layer is filled with Fenton catalyst, the third catalytic layer is filled with ozone catalyst, the outlet of the active oxygen generator is respectively communicated with the second mixer inlet, the first aerator and the second aerator, and manual valves capable of adjusting flow are respectively arranged on communicating pipes.
2. The device for treating the waste gas by the heterogeneous catalytic oxidation method according to claim 1, wherein the first water collecting tank is connected with the bottom of the second water collecting tank through a pipeline and a valve, the bottom of the first water collecting tank is provided with a water outlet, and the second water collecting tank is provided with a water replenishing port.
3. The device for treating the waste gas by the heterogeneous catalytic oxidation method according to claim 1, wherein the first water collecting tank is further provided with a pH value on-line detector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222744661.8U CN218871778U (en) | 2022-10-19 | 2022-10-19 | Multiphase catalytic oxidation method exhaust treatment device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222744661.8U CN218871778U (en) | 2022-10-19 | 2022-10-19 | Multiphase catalytic oxidation method exhaust treatment device |
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| CN218871778U true CN218871778U (en) | 2023-04-18 |
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| CN202222744661.8U Active CN218871778U (en) | 2022-10-19 | 2022-10-19 | Multiphase catalytic oxidation method exhaust treatment device |
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