CN102671597A - Gas-lift loop photo-catalytic reactor for fluidized beds - Google Patents
Gas-lift loop photo-catalytic reactor for fluidized beds Download PDFInfo
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Abstract
The invention relates to a gas-lift loop photo-catalytic reactor for fluidized beds. The gas-lift loop photo-catalytic reactor comprises a reaction shell, the reaction shell is provided with a reaction chamber, a gas inlet and a gas outlet, a light source is arranged in the reaction chamber, a draft tube with two ends open is vertically arranged in the reaction chamber, an upflow channel is arranged between two inner ends of the draft tube, an annular downflow channel is formed between the outer wall face of the draft tube and the inner wall face of the reaction shell by means of surrounding, the upper end of the upflow channel and the lower end of the same are communicated while the upper end of the downflow channel and the lower end of the same are communicated so as to form a circulating channel, the gas inlet of the reaction shell is arranged opposite to a lower port of the draft tube and is not larger than the lower port of the draft tube, and the light source is arranged in the draft tube. Since the gas inlet of the reaction shell is not larger than the lower port of the draft tube, circulating loop is formed outside and inside the draft tube in the reaction chamber so as to enable catalyst and dispersion to be completely mixed and contact with gas. The problem that an existing photo-catalytic reactor of a fluidized bed using the dispersion is uneven in catalyst dispersion is solved.
Description
Technical field
The present invention relates to the fluidized-bed reactor field, especially a kind of Airlift circulating fluidized bed photo catalysis reactor that is used to handle volatile organic contaminant (VOCs).
Background technology
According to the definition of the World Health Organization (WTO, 1989), VOC (Volatile organic compounds is called for short VOCs) is that one type of fusing point is lower than room temperature and the VOC of boiling point between 50 ~ 250 degrees centigrade.VOC extensively is present among our life, is mainly derived from various coating and adhesive, artificial board, wood furniture and paint, plastic product, carpet, leather, printing ink, fuel etc.Through detecting the newly-decorated indoor VOC that contains more than 100 kinds, what wherein concentration was higher is formaldehyde, acetaldehyde, benzene, toluene, chlorohydrocarbon etc., and these VOCs are under a cloud or confirm as carcinogen or cause fetal anomaly.The VOCs that in environment, contains higher concentration, people can feel like headache, weak, drowsy, uncomfortable feeling such as eyes are dry and astringent, respiratory tract.Therefore, VOCs has become the sick one of the main reasons of the human particularly townie mankind.
In order to solve the baneful influence that VOCs brings to health of people, many in the world countries have formulated the laws and regulations to the restriction of VOCs content.European Union limit certain activity or equipment install in an organic solvent, use the organic solvent of the organic loss of volatility in restriction paint, the indoor and upholstery.Volatile organic compounds loss in U.S.'s restriction paint, adhesive, solvent, the wood industry glue.China's formal state compulsion standard of implementing " limits of harmful substances in the GB18582-2001 indoor decorating material interior wall coating " on January 1st, 2002 limits indoor VOCs content.But the indoor VOCs content after up to the present China fits up particularly content of formaldehyde all exceeds tens of times more than of national standards.
Current processing method about VOCs mainly contains methods such as absorption, burning, condensation, wet oxidation, photochemical catalytic oxidation, biological treatment.Absorption method need consume a large amount of adsorbents, and burning need provide more heat transfer, and condensation need provide ultra-low temperature surroundings, and wet oxidation process need provide oxidant, and biological treatment need be cultivated suitable microorganism.Photocatalysis is a kind of new method for purifying and processing waste gas, and light-catalysed principle is under the effect of light and catalyst, to produce hydroxy radical, and hydroxy radical can decompose VOC gas.Photocatalysis has small investment, operating cost is low, the time of staying is short, efficient, stable, reaction thoroughly, advantage such as non-secondary pollution and become the research focus.Wu Yaxi etc. utilize the UV/TiO2 method handled in the room air common benzene series thing, alkane, alcohol, ether, aldehyde and halogenated hydrocarbon obtain good degradation effect (Wu Yaxi, Chen Liexian. environmental science and technology, 2003,26:6-7).About one of focal issue of need solving in the design and research chamber photocatalysis oxidation technique course of industrialization of highly effective photocatalytic reactor in the light-catalysed research.The form that exists according to catalyst is different, can photo catalysis reactor be divided into two types: one type is the fixed bed reactors that adopt the catalyst immobilization technology; Another kind of is the floated photo catalysis reactor that adopts fine catalyst.The fluidized bed photo catalysis reactor mostly comprises reactor shell, has the reaction chamber that is used to hold corresponding solid catalyst in the reactor shell, is provided with light source in the said reaction chamber; The top of reactor shell is provided with exhaust outlet, and the bottom is provided with air inlet, during work; In said reaction chamber, add corresponding catalyst; Make catalyst reach suspended state through said air inlet to air feed in the reaction chamber, thereby react that reacted gas is discharged from said exhaust outlet with corresponding gas.Fixed bed reactors make catalytic activity be significantly less than fluidized-bed reactor because of catalyst is fixed in certain ad-hoc location, utilize modification TiO2 method photocatalysis treatment toluene like Zhang Pengyi etc., and clearance reaches more than 88% under the fluidized; With TiO2 fixing with glass, ceramic tile, fluorescent lamp on; Clearance only can reach 15% ~ 30% (Zhang Pengyi, Liang Fuyan, Chen Qing. Environmental Chemistry; 2003,24:53-58).But stream is all less or even nanoscale because of photocatalyst granular; When therefore in existing fluidized bed photocatalytic reactor, using; Very easily taken out of outside the reactor shell; This has caused the waste of catalyst on the one hand, also makes reaction to carry out continuously on the other hand, has reduced the operating efficiency of reactor; Therefore; Someone adds corresponding dispersion liquid and is taken out of by gas to prevent catalyst in the reaction chamber of said fluidized bed photo catalysis reactor, add dispersion liquid after, though prevented the generation of the problem that catalyst is taken out of effectively; But; Because the effect of dispersion liquid, the situation that makes solid catalyst disperse inequality, reunite and deposit happens occasionally, and this has then influenced the reaction efficiency of reactor from another point of view.
Summary of the invention
The object of the present invention is to provide a kind of Airlift circulating fluidized bed photo catalysis reactor, disperse uneven problem with the catalyst of the fluidized bed photo catalysis reactor that solves existing use dispersion liquid.
In order to address the above problem; Airlift circulating fluidized bed photo catalysis reactor of the present invention adopts following technical scheme: a kind of Airlift circulating fluidized bed photo catalysis reactor; Comprise reactor shell with reaction chamber and inlet, outlet; Be provided with light source in the said reaction chamber, the upright guide shell that is provided with both ends open has upflow channel in the reaction chamber between two ends in the said guide shell; Surround the circulation road that falls of annular between the outside wall surface of guide shell and the internal face of reactor shell; Said ascending, descending circulation road upper and lower end is communicated with respectively and forms circulation canal, and the air inlet of reactor shell and the lower port of guide shell are over against the lower port that is provided with and is not more than guide shell, and said light source is located in the guide shell.
The inlet, outlet correspondence of said reactor shell is communicated with confession, blast pipe; Between its air inlet and reactor shell, be provided with branch's air inlet on the said air supply pipe; Between its exhaust outlet and reactor shell, be provided with the branch row gas port on the blast pipe; The gas outlet that described branch air inlet and is located at the air pump of reactor enclosure external is connected, and the air inlet of said air pump is connected with said branch row gas port.
Corresponding confession, the exhaust switch valve of being provided with between the exhaust outlet of the air inlet of said air supply pipe and branch air inlet, blast pipe and the branch row gas port.
Said guide shell is the extension of broken line shape from the top down with the barrel of coaxial setting of reactor shell and guide shell.
Said guide shell and the coaxial setting of reactor shell, the volume between the said upflow channel upper and lower side equates with the said volume that falls between the circulation road upper and lower side.
The lower surface of said guide shell and the internal face of reactor shell surround the refluxing opening of an annular, and the aperture area of said refluxing opening equates with the aperture area of the lower port of guide shell.
Said distributor housing bottom is provided with gas distributor in its air inlet upper reaches, and said gas distributor has the gas distribution shower nozzle, and the upper end of said gas distribution shower nozzle extends in the scope of said guide shell delineation and is not less than the lower end of guide shell.
Said gas distribution shower nozzle is made up of metal sintering head that is positioned at the upper end and the stainless steel tube that is connected in said metal sintering head lower end.
The coaxial insulation sleeve that is arranged with on the said reactor shell; Said insulation sleeve and reactor shell constitute sandwich and and the outside wall surface of reactor shell between surround a thermal insulation medium chamber, bottom, the top correspondence of insulation sleeve are provided with the entery and delivery port that communicates with said thermal insulation medium chamber.
The air inlet of said reactor shell by be located at the reactor shell side wall lower ends in turn edge and surround, turn edge in described and the sidewall of reactor shell between be connected smoothly through circular arc.
Because Airlift circulating fluidized bed photo catalysis reactor of the present invention is provided with said guide shell in its reaction chamber, the air inlet of reactor shell and the lower port of guide shell are over against the lower port that is provided with and is not more than guide shell; Therefore; In use; Can at first in described reaction chamber, pack into corresponding solid catalyst and dispersion liquid, then through said air inlet to air feed in the reactor shell, be not more than the lower port of guide shell owing to the air inlet of reactor shell; Therefore getting into gas in the reaction chamber at first rises and drives dispersion liquid in the guide shell and flow; Make finally in the reaction chamber in the inside and outside formation circulation circulation of guide shell, thereby can make and fully to mix and contact between catalyst and the dispersion liquid that the catalyst that has solved the fluidized bed photo catalysis reactor of existing use dispersion liquid disperses the problem of inequality with gas.
Description of drawings
Fig. 1 is the structural representation of the embodiment 1 of Airlift circulating fluidized bed photo catalysis reactor;
Fig. 2 is the structural representation of the gas distribution shower nozzle among Fig. 1.
The specific embodiment
The embodiment 1 of Airlift circulating fluidized bed photo catalysis reactor shown in Fig. 1-2, has reactor shell 1; Reactor shell 1 is provided with reaction chamber for the barrel type reactor housing and in inside; Reaction chamber be used for when reactor is worked, packing into solid catalyst (present embodiment is the nano-catalytic particle, like TiO2, ZnO, SnO2, CdS, Fe/ TiO2, Cu/ TiO2, Pt/ TiO2, La/TiO2, Nd/TiO2) and dispersion liquid (being deionized water in the present embodiment); The upright guide shell 2 that is provided with both ends open in the reaction chamber; The barrel of guide shell 2 indention on above-below direction extend and with reactor shell 1 coaxial setting, in addition, the outside wall surface of guide shell 2 and upper and lower end face all and between the internal face of reactor shell 1 have spacing; Guide shell 2 is divided into two through its barrel with the reaction chamber of reactor shell 1; Specifically, i.e. the scope of guide shell 2 delineation accounts for volume half the of reaction chamber, reaches the circulation road that falls between the internal face of the outside wall surface of guide shell 2 and reactor shell 1 thereby make reaction chamber be divided into upflow channel guide shell 2 in; Upflow channel and the upper and lower end that falls circulation road are communicated with gap between the reactor shell internal face through guide shell 2 upper and lower end faces respectively; Thereby make upflow channel with fall circulation road and in reaction chamber, constitute a circulation canal, wherein surround an annular refluxing opening between the internal face of the lower surface of guide shell 2 and reactor shell 1, the aperture area of this refluxing opening equates with the lower port area of guide shell 2; The bottom of reactor shell 1 has air inlet and is provided with gas distributor in the air inlet upper reaches; Wherein the air inlet of reactor shell 1 by be located at reactor shell 1 lower end in turn over 1-1 along surrounding, between the sidewall of turn edge in said 1-1 and reactor shell 1 with the arc transition smooth connection, thereby avoided catalyst gathering effectively at reactor bottom; The aperture area of the air inlet of reactor shell 1 be not more than guide shell 2 lower port aperture area and with the lower port of guide shell 2 over against setting; Thereby can make that entering into gas in the reaction chamber from air inlet all rises through said upflow channel and drive catalyst and rise with dispersion liquid, when dispersion liquid rises to the peak of guide shell 2, begin in the upper surface through guide shell 2 under the gravity effect and the gap between reactor shell 1 internal face to fall from said that circulation road flows down and finally flow back to guide shell 2 from said refluxing opening, thereby the circulation that formation circulates and continue to flow moving; Especially the barrel of guide shell 2 is the extension of broken line shape from top to bottom; Therefore can form the isotropism turbulent flow, increase the contact area of gas and catalyst, increase mass transfer area; The reunion and the deposition of catalyst have been avoided effectively; Make catalyst fully mix simultaneously, solved the uneven problem of catalyst distribution, in the present embodiment with dispersion liquid; Adjacent two broken lines corresponding on the barrel of guide shell are isometric, thus make adjacent two broken lines mutually away from an end to connect that the back forms with two broken lines be the isosceles triangle of waist; Gas distributor has distributor housing 3; The upper end of distributor housing 3 is provided with distributor substrate with holes 4 and is fixedly connected with reactor shell 1 through distributor substrate 4; Surround an air chamber between distributor substrate 4 and the distributor housing 3; Distributor housing 3 is provided with air supply pipe 5; Be provided with branch's air inlet between the air inlet of air supply pipe 5 and the reactor shell 1 and between air inlet and branch's air inlet, be provided with air supply valve valve 6; The upper surface of distributor substrate 4 is provided with gas distribution shower nozzle 7, and gas distribution shower nozzle 7 communicates through the air chamber of the through hole on the distributor substrate 4 with distributor housing 3, and gas distribution shower nozzle 7 is made up of the metal sintering head 7-2 that is fixedly set in the stainless steel tube 7-1 on the distributor substrate 4 and is located at each stainless steel tube upper end; Metal sintering head 7-2 plays a role in filtering; Can prevent catalyst adverse current in the reaction chamber effectively to gas distributor, the upper end of metal sintering head 7-2 extends in the scope of guide shell 2 delineations and it highly is not less than the lower end height of guide shell 2, thereby guarantees that the gas that infeeds from gas distributor gets in the guide shell 2 smoothly; The bottom of reactor shell 1 also is provided with discharge duct 8, and discharge duct 8 passes gas distributor and extends to the position below the gas distributor; The outer, coaxial of reactor shell 1 is arranged with insulation sleeve 9; Insulation sleeve 9 constitutes sandwich with reactor shell 1; Specifically; Promptly be incubated between the outside wall surface of internal face and reactor shell of sleeve and surround a thermal insulation medium chamber, the thermal insulation medium chamber is used for supplying condensed water (hot water that other embodiment also is used to heat) to flow through keeping the temperature in the reactor shell 1, thereby prevents Yin Wendu from raising and reduce activity of such catalysts; The upper end of reactor shell 1 has a reactor expanding reach 10; Reactor expanding reach 10 top cover are provided with top support plate 11; Top support plate 11 is provided with the Bright Source Protection pipe 13 that extends to the light source 12 in the reaction chamber and be sheathed on light source 12 outsides; Wherein light source 12 adopts bar-shaped quartz burner; Bright Source Protection pipe 13 adopts the quartz ampoule of an end opening, and the upper end of Bright Source Protection pipe 13 is openend and fixedly is assemblied on the top support plate 11 through a seal snap ring that the lower end of Bright Source Protection pipe 13 is fixed through a seal snap ring of being located on the distributor substrate 4; The light source load hole that top support plate 11 is provided with reinforced joint 14 and communicates with the opening of Bright Source Protection pipe, reinforced joint 14 is provided with reinforced switch valve; The gas outlet of reactor shell 1 is located on the top support plate 11; Top support plate 11 is provided with the blast pipe 15 that communicates with the gas outlet of reactor shell 1; Between its exhaust outlet and reactor shell, be provided with the branch row gas port on the blast pipe 15 and pass through said branch row gas port and be connected with the air inlet of an air pump 16; Be provided with exhaust switch valve 17 between the exhaust outlet of blast pipe 15 and the branch row gas port; Air pump 16 is located at the outside of reactor shell 1, the gas outlet of air pump 16 be communicated with the air inlet pipe of gas distributor and and air inlet pipe between be provided with air inlet switch valve 18, thereby realized being connected of air inlet of air pump and distributor housing.
During work, corresponding checkout gear can be set in the exhaust ports of said blast pipe; At first close said air supply valve valve, exhaust switch valve and discharge duct, the slurry that will contain catalyst and deionized water is added in the reactor by reinforced joint, adds highly identical with the guide shell height; Close reinforced joint then, open air pump, air pump is transported to reactor bottom with the gas in the reactor expanding reach; And the slurries in the promotion guide shell move upward; Move downward through the said circulation road that falls behind the top of slurries arrival guide shell, the slurry in the reactor can expand and cross guide shell and form interior circulation, opens water inlet switch valve and the effluent switch valve and the continuous introducing condensed water of insulation sleeve then; Open light source, make the slurries circulation reach balance; Air inlet through air supply pipe injects pending gas (gas that contains VOCs) in reactor at last; Open exhaust switch valve; VOCs content through detection assay blast pipe exhaust ports is also adjusted tolerance and the air pump that infeeds, and after the gas that is processed reaches discharge value, discharges.
Claims (10)
1. Airlift circulating fluidized bed photo catalysis reactor; Comprise reactor shell, be provided with light source in the said reaction chamber, it is characterized in that with reaction chamber and inlet, outlet; The upright guide shell that is provided with both ends open in the reaction chamber; Between two ends, has upflow channel in the said guide shell, surround the annular circulation road that falls between the outside wall surface of guide shell and the internal face of reactor shell, said ascending, descending circulation road upper and lower end is communicated with respectively and forms circulation canal; The air inlet of reactor shell and the lower port of guide shell are over against the lower port that is provided with and is not more than guide shell, and said light source is located in the guide shell.
2. Airlift circulating fluidized bed photo catalysis reactor according to claim 1; It is characterized in that; The inlet, outlet correspondence of said reactor shell is communicated with confession, blast pipe; Between its air inlet and reactor shell, be provided with branch's air inlet on the said air supply pipe; Between its exhaust outlet and reactor shell, be provided with the branch row gas port on the blast pipe, the gas outlet that described branch air inlet and is located at the air pump of reactor enclosure external is connected, and the air inlet of said air pump is connected with said branch row gas port.
3. Airlift circulating fluidized bed photo catalysis reactor according to claim 2 is characterized in that, corresponding confession, the exhaust switch valve of being provided with between the exhaust outlet of the air inlet of said air supply pipe and branch air inlet, blast pipe and the branch row gas port.
4. Airlift circulating fluidized bed photo catalysis reactor according to claim 1 is characterized in that, said guide shell is the extension of broken line shape from the top down with the barrel of coaxial setting of reactor shell and guide shell.
5. Airlift circulating fluidized bed photo catalysis reactor according to claim 1 is characterized in that, said guide shell and the coaxial setting of reactor shell, and the volume between the said upflow channel upper and lower side equates with the said volume that falls between the circulation road upper and lower side.
6. Airlift circulating fluidized bed photo catalysis reactor according to claim 1; It is characterized in that; The lower surface of said guide shell and the internal face of reactor shell surround the refluxing opening of an annular, and the aperture area of said refluxing opening equates with the aperture area of the lower port of guide shell.
7. Airlift circulating fluidized bed photo catalysis reactor according to claim 1; It is characterized in that; Said distributor housing bottom is provided with gas distributor in its air inlet upper reaches; Said gas distributor has the gas distribution shower nozzle, and the upper end of said gas distribution shower nozzle extends in the scope of said guide shell delineation and is not less than the lower end of guide shell.
8. Airlift circulating fluidized bed photo catalysis reactor according to claim 7 is characterized in that, said gas distribution shower nozzle is made up of metal sintering head that is positioned at the upper end and the stainless steel tube that is connected in said metal sintering head lower end.
9. Airlift circulating fluidized bed photo catalysis reactor according to claim 1; It is characterized in that; The coaxial insulation sleeve that is arranged with on the said reactor shell; Said insulation sleeve and reactor shell constitute sandwich and and the outside wall surface of reactor shell between surround a thermal insulation medium chamber, bottom, the top correspondence of insulation sleeve are provided with the entery and delivery port that communicates with said thermal insulation medium chamber.
10. Airlift circulating fluidized bed photo catalysis reactor according to claim 1; It is characterized in that; The air inlet of said reactor shell by be located at the reactor shell side wall lower ends in turn edge and surround, turn edge in described and the sidewall of reactor shell between be connected smoothly through circular arc.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102921364A (en) * | 2012-11-14 | 2013-02-13 | 天津市先权工贸发展有限公司 | Fluidized bed photo-thermal reactor |
| CN104722202A (en) * | 2015-03-12 | 2015-06-24 | 河海大学 | Air purifying system realizing catalytic oxidation of acetone through nano TiO2 |
| CN107029553A (en) * | 2017-06-21 | 2017-08-11 | 中山市科慧物联网科技有限公司 | A kind of high-level cleaner |
| WO2017222805A1 (en) * | 2016-06-20 | 2017-12-28 | Sabic Global Technologies B.V. | Using natural gas as agitating gas for photocatalytic water splitting |
| CN110420610A (en) * | 2019-09-02 | 2019-11-08 | 南京中汇能源科技研发中心 | A kind of micro/nano-scale multiphase flow generating apparatus |
| CN112079513A (en) * | 2020-09-25 | 2020-12-15 | 南京大学 | System and process for treating wastewater containing pyridine heterocyclic compounds |
| CN113058065A (en) * | 2021-03-25 | 2021-07-02 | 西安医学院 | Nano-photocatalyst sterilization reactor |
| CN115340144A (en) * | 2022-07-22 | 2022-11-15 | 中国石油化工股份有限公司 | Photocatalytic fluidized bed reactor |
| CN116747707A (en) * | 2023-08-23 | 2023-09-15 | 上海凌泽信息科技有限公司 | High-efficiency nano material photocatalysis reaction device |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102921364A (en) * | 2012-11-14 | 2013-02-13 | 天津市先权工贸发展有限公司 | Fluidized bed photo-thermal reactor |
| CN104722202A (en) * | 2015-03-12 | 2015-06-24 | 河海大学 | Air purifying system realizing catalytic oxidation of acetone through nano TiO2 |
| WO2017222805A1 (en) * | 2016-06-20 | 2017-12-28 | Sabic Global Technologies B.V. | Using natural gas as agitating gas for photocatalytic water splitting |
| CN107029553B (en) * | 2017-06-21 | 2023-12-22 | 安徽灵杰环境净化科技有限公司 | High-efficient purifier |
| CN107029553A (en) * | 2017-06-21 | 2017-08-11 | 中山市科慧物联网科技有限公司 | A kind of high-level cleaner |
| CN110420610A (en) * | 2019-09-02 | 2019-11-08 | 南京中汇能源科技研发中心 | A kind of micro/nano-scale multiphase flow generating apparatus |
| CN110420610B (en) * | 2019-09-02 | 2024-02-20 | 杭州烃能科技研究有限公司 | Micro-nano scale multiphase flow generating device |
| CN112079513A (en) * | 2020-09-25 | 2020-12-15 | 南京大学 | System and process for treating wastewater containing pyridine heterocyclic compounds |
| CN112079513B (en) * | 2020-09-25 | 2021-11-23 | 南京大学 | System and process for treating wastewater containing pyridine heterocyclic compounds |
| CN113058065A (en) * | 2021-03-25 | 2021-07-02 | 西安医学院 | Nano-photocatalyst sterilization reactor |
| CN115340144A (en) * | 2022-07-22 | 2022-11-15 | 中国石油化工股份有限公司 | Photocatalytic fluidized bed reactor |
| CN116747707B (en) * | 2023-08-23 | 2023-11-21 | 上海凌泽信息科技有限公司 | High-efficiency nano material photocatalysis reaction device |
| CN116747707A (en) * | 2023-08-23 | 2023-09-15 | 上海凌泽信息科技有限公司 | High-efficiency nano material photocatalysis reaction device |
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Application publication date: 20120919 |