CN1112229C

CN1112229C - Method and device for treating organic pollution gas

Info

Publication number: CN1112229C
Application number: CN98112006A
Authority: CN
Inventors: 安纬珠; 周坤粦; 文晓刚; 马胡兰; 张勇; 曹伟民
Original assignee: Chengdu Institute of Organic Chemistry of CAS
Current assignee: Chengdu Institute of Organic Chemistry of CAS
Priority date: 1998-05-15
Filing date: 1998-05-15
Publication date: 2003-06-25
Anticipated expiration: 2018-05-15
Also published as: CN1235864A

Abstract

The invention relates to a method and device for treating organic polluted gas combining silent discharge and photocatalytic technology, which is composed of a silent discharge power supply, a silent discharge electrode, a light source, a photocatalyst and a reactor. Can be split or one-piece combination. After silent discharge treatment and photocatalytic treatment, organic pollutant molecules can be completely decomposed into environmentally harmless substances, thereby improving the treatment efficiency of organic polluted gases, reducing treatment energy consumption, avoiding secondary pollution, and fully meeting the requirements of environmental protection .

Description

Administer the device of organic pollutant

The present invention is a kind of device of administering organic pollutant, belongs to plasma and photochemistry field, particularly field of environment protection.

Atmosphere and groundwater quality pollute has become global serious public hazards, and various countries also more and more pay attention to control atmosphere pollution.For organic pollutant, can adopt voltolising technology to handle.The voltolising process can produce a large amount of high reaction activity species under normal temperature and pressure conditions, thereby can utilize these high reaction activity species to destroy organic pollutant molecule.But in the ordinary course of things, when adopting voltolising technology to administer organic pollutant separately, the organic contamination molecule thoroughly is not decomposed into the material of environmental sound sometimes, but rests on the organic intermediate stage, thereby might cause secondary pollution.For example, researchers such as U.S. Los Alamos National Laboratory study in the voltolising organic pollution alkenyl halide process, find that organic pollution not by permineralization, can detect the kind accessory substance coldest days of the year end at least.(《Plasma Science and the Environment》，Editors：Wallace Manheimer，Linda E.Sugiyama & Thomas H.Stix，American Instituteof Physics.Woodbury，New York，1977，p209-298)

The objective of the invention is to make full use of the high activity species that produce in the voltolising process; make it under temperate condition, further decompose organic intermediate; thereby realize under low energy consumption, the short flow process organic pollutant molecule thoroughly being decomposed into the material of environmental sound; clean emission, the protection environment.

Purpose of the present invention can realize by following apparatus:

Voltolising and photocatalysis process combination are got up, its combination can be, by voltolising power supply [7] with the photocatalysis apparatus that voltolising reactor [8] the voltolising device of forming and the photo catalysis reactor [9] that light source [5], photochemical catalyst [6] are housed of two voltolising electrodes [3], [4] form is housed connects, and become split type combination; Also can be with two voltolising electrodes [3], [4], light source [5], photochemical catalyst [6] is contained in voltolising/photo catalysis reactor [10], adds voltolising power supply [7] and becomes the voltolising/photocatalysis apparatus of integral type combination.

Voltolising power supply [7] can be that crest voltage is 50～3500Hz sine wave or short pulse and the direct current of 5～35Kv.

Voltolising electrode [3], [4] material can be copper, stainless steel, aluminium and silver, and electrode form can be flat board, cylinder or thread spiral, and the dielectric material on coated electrode surface can be quartz, glass, mica, polytetrafluoroethylene (PTFE).

Light source [5] can be that wave-length coverage is the uviol lamp of 254nm～380nm according to the catalyst that adopts.

Photochemical catalyst [6] can be TiO ₂, SiO ₂The V that supports ₂O ₃, MoO ₃Deng the n type semiconductor oxide.

Voltolising reactor [8], photo catalysis reactor [9] and voltolising photo catalysis reactor [10] can adopt single or multiple tubular types or flat-plate reactor.

Voltolising electrode [3], [4] are contained in respectively on the inner and outer pipe of voltolising reactor [8] or voltolising/photo catalysis reactor [10], and are connected with voltolising power supply [7] respectively: light source [5] and photochemical catalyst [6] are contained in respectively between the interior pipe and inner and outer pipes of photo catalysis reactor [9] or voltolising/photo catalysis reactor [10].

Further specify the present invention below in conjunction with accompanying drawing.

Fig. 1 is a split type combination schematic diagram of the present invention.

Fig. 2 is two kinds of schematic diagrames of A, B of integral type combination of the present invention.

Embodiments of the invention.

In Fig. 1, voltolising electrode [3] and [4] are contained in respectively on the inner and outer pipe of voltolising reactor [8], and be connected with voltolising power supply [7] respectively, light source [5] and photochemical catalyst [6] are contained in respectively in the interior pipe of photo catalysis reactor [9] and between inner and outer pipes, and voltolising reactor [8] and photo catalysis reactor [9] are together in series.[1] enters the interior pipe of voltolising reactor [8] to organic pollutant from the gas access, enter outer tube again, in inner and outer pipe, accept simultaneously voltolising, after wherein organic pollutant molecule is resolved into organic intermediate by the high activity species, enter photo catalysis reactor [9] again, accept illumination this moment, and under the catalysis of photochemical catalyst [6], organic intermediate is further resolved into the material of environmental sound by the high activity species, enters atmosphere through gas vent [2] again.

Among Fig. 2 A, voltolising electrode [3] and [4] are contained in respectively on the inner and outer pipe of voltolising/photo catalysis reactor [10] bottom, and be connected with voltolising power supply [7] respectively, light source [5] and photochemical catalyst [6] are contained in respectively in the interior pipe on voltolising/photo catalysis reactor [10] top and between inner and outer pipes.

Organic pollutant enters the bottom of voltolising/photo catalysis reactor [10] outer tube from the gas access [1] of lower end, and after accepting voltolising, enter top again, accept illumination and photocatalysis, organic pollutant molecule is thoroughly decomposed after gas vent [2] enters atmosphere.

Thread screw electrode of voltolising [3] and cylinder electrode [4] are contained in respectively on the inner and outer pipe of voltolising/photo catalysis reactor [10] among Fig. 2 B, and be connected with voltolising power supply [7] respectively, light source [5] and photochemical catalyst [6] are contained in respectively in the interior pipe of voltolising/photo catalysis reactor [10] and between inner and outer pipes.

[1] enters voltolising/photo catalysis reactor [10] to organic pollutant from the gas access, accepts voltolising and photocatalysis treatment simultaneously, and organic pollutant molecule is thoroughly decomposed after gas vent [2] enters atmosphere.Effect of the present invention sees Table 1 and table 2.

Benzene and air mixture reaction condition in table 1. voltolising-photocatalysis split anabolic process

Voltolising		Photocatalysis		The gaseous mixture reaction condition
Voltolising		Photocatalysis		The gaseous mixture reaction condition		Power supply	50Hz 9000v	Light source	The 4W ultraviolet	Gas flow rate	14ml/min
Electrode material	Copper sheet	Photochemical catalyst	TiO ₂Particulate	Reaction temperature	16-40℃	Power supply	50Hz 9000v	Light source	The 4W ultraviolet	Gas flow rate	14ml/min

Benzene and air mixture reaction result in table 2. voltolising-photocatalysis split anabolic process

Use	Inlet benzene content (ppm)	Outlet benzene content (ppm)	The intermediate that look-the matter coupling analyzes
Use	Inlet benzene content (ppm)	Outlet benzene content (ppm)	The intermediate that look-the matter coupling analyzes	Voltolising is used separately	497.15	10.14	Nine kinds of possible intermediates such as hexanal, enanthaldehyde, aldehyde C-9, capraldehyde
Voltolising-photocatalysis split combination	497.15	Can't check	Can't check	Voltolising is used separately	497.15	10.14

From table 2, as seen, use method of the present invention and device thoroughly decomposing organic pollutant molecule and intermediate, realize the purpose of environmental protection.And use voltolising technology separately, and residual organic pollution is not only arranged, and have intermediate to emit, can not satisfy environmental protection requirement.

Claims

1. A device for treating organic polluting gases, characterized in that it combines silent discharge and photocatalytic technology, and its combination method is: a silent discharge power supply [7] and two silent discharge electrodes [3], [4] The silent discharge device composed of a silent discharge reactor [8] is connected in series with the photocatalytic device composed of a photocatalytic reactor [9] equipped with a light source [5] and a photocatalyst [6]. A silent discharge electrode [3], [4], light source [5], and photocatalyst [6] are installed in a silent discharge/photocatalytic reactor [10], plus a silent discharge power supply [7] to form an integrated combination .

2. The device according to claim 1, characterized in that the silent discharge power supply [7] can be a 50-3500Hz sine wave with a peak voltage of 5-35Kv.

3. The device for treating organic polluting gases according to claim 1, characterized in that the silent discharge electrodes [3], [4] can be flat plates, cylinders or filamentary spirals, and the material is copper, stainless steel, aluminum or silver, The medium covering the electrode surface can be quartz, glass, mica, polytetrafluoroethylene.

4. The device for treating organic polluting gases according to claim 1, characterized in that the light source [5] can be ultraviolet light with a wavelength range of 254-380nm.

5. The device for treating organic polluting gases according to claim 1, characterized in that the photocatalyst [6] can be TiO ₂ , supported V ₂ O ₅ , MoO ₃ and the like.

6. The device for treating organic polluting gases according to claim 1, characterized in that the silent discharge reactor [8], the photocatalytic reactor [9] and the silent discharge photocatalytic reactor [10] can all use combined tubes type reactor.

7. The device for treating organic polluting gases according to claim 1, 2, 3, 4, 5 or 6, characterized in that the silent discharge electrodes [3] and [4] are respectively installed in the silent discharge reactor [8] or The inner and outer tubes of the silent discharge/photocatalytic reactor [10] are respectively connected to the silent discharge power supply [7]; the light source [5] and the photocatalyst [6] are respectively installed in the photocatalytic reactor [9] or the silent discharge / between the inner tube of the photocatalytic reactor [10] and the inner and outer tubes.