CN101485958B - Photocatalysis reactor for degrading dioxins in flue gas and method for activating photocatalyst - Google Patents
Photocatalysis reactor for degrading dioxins in flue gas and method for activating photocatalyst Download PDFInfo
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- CN101485958B CN101485958B CN2009100956461A CN200910095646A CN101485958B CN 101485958 B CN101485958 B CN 101485958B CN 2009100956461 A CN2009100956461 A CN 2009100956461A CN 200910095646 A CN200910095646 A CN 200910095646A CN 101485958 B CN101485958 B CN 101485958B
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Abstract
The invention relates to a technique for controlling dioxin discharge in the process of processing solid wastes by a burning method, and aims to provide a photocatalytic reactor for degrading dioxin in flue gas and a photocatalyst activating method. The reactor is a light transparent container and the inside of the reactor is provided with a porous medium which is loaded with the photocatalyst. The method for activating the photocatalyst comprises the following steps: irradiating a deactivated photocatalyst by light in the presence of N2 gas; irradiating the photocatalyst by the light in the presence of O2; and washing the photocatalyst with clear water to recover the activity for standby. Compared with the prior process, the photocatalytic reactor and the photocatalyst activating method are more economical, and process the dioxide in the flue gas more thoroughly.
Description
Technical field
The present invention relates to the technology of dioxin emission control in the burning method disposal of solid discarded object process, particularly relate to the photo catalysis reactor and the method for activating photocatalyst of the flue gas dioxin that is used for degrading.
Background technology
Under the background that Chinese national economy high speed development and people's living standard improve constantly, the generation of trade waste and domestic waste also increases sharply.Burning method is handled discarded object, compares with the Other Waste processing method, can reach the target of " minimizing, resource and innoxious " better, extensive use at home and abroad.Large-scale garbage burning factory has also successively been set up in the many cities of China.Can produce noxious material in the burning process, wherein maximum with the toxicity of dioxin, be disposed to that the back is difficult to degraded in the environment, and have fat-soluble and the characteristics property accumulated, there is potential hazard in health.Therefore, generation and discharging how to control dioxin become extremely urgent, anxious problem to be solved.
The dioxin emission control technique mainly is divided into two types in the burning process: one type is to suppress the generation of dioxin in burning process; One type is that the dioxin that has generated is removed the amount that gets in the environment to reduce.What the latter extensively adopted at present is that sack cleaner combines the charcoal absorption technology.This method is through pulverous active carbon being spurted into the dioxin that adsorbs in the flue in the gas phase, filtering flying dust and active carbon down with deduster then, thereby reduce the dioxin amount through smoke stack emission.But there are two main defectives in this method: the one, and itself can not reduce the total amount of dioxin this method; Just the dioxin in the gas phase is transferred in the solid phase through the absorption of active carbon and collected then; The flying dust enrichment that is mixed with active carbon that produces the dioxin of high concentration, very big to the harm of environment, the disposal for the castoff burning flying dust does not at present have good way yet; The method of domestic main employing landfill is disposed this type flying dust, and is very big to the potential hazard of environment; The 2nd, this method need consume a large amount of active carbons, and operating cost is higher.
Therefore, seek more economical, handle more completely to dioxin in the flue gas that method is very necessary.
Summary of the invention
The objective of the invention is to overcome deficiency of the prior art, the photo catalysis reactor and the method for activating photocatalyst of dioxin in the flue gas that is provided for degrading.
The invention provides a kind of photo catalysis reactor of the flue gas dioxin that is used for degrading, said photo catalysis reactor is a light transmission container, and built-in porous media in the photo catalysis reactor loads photochemical catalyst on the porous media; Said photochemical catalyst is a nano-TiO
2, noble metal decorated nano-TiO
2Or through the nano-TiO compound with semiconductor catalyst
2In any one.
As a kind of improvement, described porous media be active carbon, diatomite or bentonite wherein any one.
As a kind of improvement, only ultraviolet ray that photo catalysis reactor adopts or in the visible light any one.
The present invention also provides a kind of activation method of aforementioned lights catalyst, may further comprise the steps:
(1) at N
2Under the protective atmosphere of gas, use up the photochemical catalyst of irradiation inactivation;
(2) containing O
2Under the atmosphere of gas, use up the photochemical catalyst that irradiation was handled through the last step;
(3) clean the photochemical catalyst of handling through the last step with clear water, it is subsequent use to accomplish activation recovering.
As a kind of improvement, only ultraviolet ray of adopting in two steps of said photo-irradiation treatment or in the visible light any one.
As a kind of improvement, said at N
2Use up the process of the photochemical catalyst of irradiation inactivation under the protective atmosphere of gas and in the photo catalytic reduction reactor, carry out, the photo catalytic reduction reactor is the quartz container that import and outlet are set.
As a kind of improvement, saidly containing O
2Carry out in the photocatalytic oxidation degradation reactor with the process of light irradiates light catalyst under the atmosphere of gas, the photo catalytic reduction reactor is the quartz container that import and outlet are set.
The method of dioxin in the photocatalytic degradation incinerator smoke among the present invention; Be in tail gas from incinerator is handled, photo catalysis reactor to be set; Photochemical catalyst in the Photoreactor loads with porous media and places light transmission container; And utilize light to shine, the dioxin of photochemical catalyst in can the absorption degradation flue gas.After photochemical catalyst is saturated, with its taking-up, penetrate process photo catalytic reduction reactor and photocatalytic oxidation degradation reactor under the condition in illumination, at last through the purge chamber, can make photochemical catalyst recover active, add photo catalysis reactor once more and recycle.
May further comprise the steps:
(1) photochemical catalyst is loaded in the porous media, puts into photo catalysis reactor, the anti-source of students of the light in the reactor can directly shine catalyst through light transmission container.Photoreactor is installed in the deduster rear portion, and the flue gas of treated mistake directly discharges;
(2) photo catalysis reactor because the materials such as dioxin that photocatalytic surfaces absorbs accumulate gradually, dies down its activity after operation a period of time, and at this moment photochemical catalyst takes out, and changes subsequent use photochemical catalyst;
(3) photochemical catalyst that takes out is put into the photo catalytic reduction reactor, at N
2Under the protective atmosphere of gas, use up the irradiation reaction;
(4) photochemical catalyst of handling through the last step is put into the photocatalytic oxidation degradation reactor, is containing O
2Under the atmosphere of gas, use up the irradiation reaction;
(5) photochemical catalyst of handling through the last step is put into the purge chamber, cleans with clear water;
(6) photochemical catalyst of handling is put into photo catalysis reactor work once more.
Beneficial effect of the present invention is: adopt photo catalysis reactor and method for activating photocatalyst among the present invention more more economical than traditional handicraft, handle more thorough to dioxin in the flue gas.
Description of drawings
Fig. 1 is a process chart of the present invention.
Solid line direction arrow among the figure is the processing route of flue gas, and the hollow direction arrow is a nano-TiO
2The composite catalyzing degradative pathway.
The specific embodiment
In tail gas from incinerator is handled, photo catalysis reactor is set, the photochemical catalyst in the Photoreactor loads with porous media and places light transmission container, and utilizes light to shine, the dioxin of photochemical catalyst in can the absorption degradation flue gas.After photochemical catalyst is saturated, with its taking-up, penetrate process photo catalytic reduction reactor and photocatalytic oxidation degradation reactor under the condition in illumination, at last through the purge chamber, can make photochemical catalyst recover active, add photo catalysis reactor once more and recycle.
Photochemical catalyst can be selected nano-TiO for use
2, through the nano-TiO of depositing noble metal modification
2, through the nano-TiO compound with other semiconductor catalysts
2In any one, be nano-TiO in the present embodiment
2
The porous media of loading photochemical catalyst can be selected any one in active carbon, diatomite or the bentonite, is active carbon in the present embodiment.In catalytic reactor, the nano-TiO that will load with active carbon
2Be placed in the quartz ampoule, shine with ultraviolet.Active carbon has good adsorptivity, nano-TiO
2Have adsorptivity equally, the dioxin in the flue gas is attracted to TiO
2The surface, wherein a part under ultraviolet irradiation by TiO
2Catalytic degradation passes through after the photo catalysis reactor like this, and the dioxin of flue gas has obtained removal to a great extent.
After work a period of time, nano-TiO
2Reached saturation state, with its taking-up.
At first with nano-TiO
2Put into the photo catalytic reduction reactor, the photo catalytic reduction reactor is the quartz container that import and outlet are arranged.With nano-TiO
2Put into, be evenly distributed on the bottom of container, feed N
2Air-flow is treated to shine with ultraviolet lamp on container top after the emptying of reactor air, reacts the sufficiently long time.At this moment attached to nano-TiO
2The high chloro dioxin on surface is the low chloro dioxin of degrading easily by catalytic degradation, or directly is degraded to the little molecule of inorganic matter.
Second step is with nano-TiO
2Put into the photocatalytic oxidation degradation reactor, the photocatalytic oxidation degradation reactor is the quartz container that import and outlet are arranged.The nano-TiO that the last step was handled
2Put into, be evenly distributed on container bottom, feeding contains O
2The air-flow of gas is treated to shine with ultraviolet lamp on the top of container after the air emptying in the reactor, reacts the sufficiently long time.At this moment attached to nano-TiO
2The low chloro dioxin on surface is broken down into the little molecule of inorganic matter.
The 3rd step will be gone up the nano-TiO that the step obtains
2Clean with clear water, to remove the little molecule of inorganic matter of remained on surface.
Through the above-mentioned steps nano-TiO
2Activity be restored, can recycle in the photo catalysis reactor of packing into.
In this example, be not 2.1ng/m through the dioxin concentration before the photo catalysis reactor
3, be 0.0294ng/m through the concentration of dioxin behind the photo catalysis reactor
3, degradation efficiency reaches 98.6%, and degradation effect is remarkable.And saturated photochemical catalyst process processing procedure, activation recovering is normal.
At last, what also need idea is that what more than to enumerate only is specific embodiment of the present invention.Obviously, the invention is not restricted to above embodiment, a lot of distortion can also be arranged.All distortion that those of ordinary skill in the art can directly derive or associate from content disclosed by the invention all should be thought protection scope of the present invention.
Claims (4)
1. the activation method of the photochemical catalyst of the flue gas dioxin that is used for degrading may further comprise the steps:
(1) at N
2Under the protective atmosphere of gas, use up the photochemical catalyst of irradiation inactivation;
(2) containing O
2Under the atmosphere of gas, use up the photochemical catalyst that irradiation was handled through the last step;
(3) clean the photochemical catalyst of handling through the last step with clear water, it is subsequent use to accomplish activation recovering;
Said photochemical catalyst is loaded on the porous media, and photochemical catalyst is a nano-TiO
2, noble metal decorated nano-TiO
2Or through the nano-TiO compound with other semiconductor catalysts
2In any one.
2. according to the activation method of the said photochemical catalyst of claim 1, it is characterized in that only ultraviolet ray of adopting in two steps of said photo-irradiation treatment or in the visible light any one.
3. according to the activation method of the said photochemical catalyst of claim 1, it is characterized in that, said at N
2Use up the process of the photochemical catalyst of irradiation inactivation under the protective atmosphere of gas and in the photo catalytic reduction reactor, carry out, the photo catalytic reduction reactor is the quartz container that import and outlet are set.
4. according to the activation method of the said photochemical catalyst of claim 1, it is characterized in that, saidly containing O
2Carry out in the photocatalytic oxidation degradation reactor with the process of light irradiates light catalyst under the atmosphere of gas, the photocatalytic oxidation degradation reactor is the quartz container that import and outlet are set.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009100956461A CN101485958B (en) | 2009-01-15 | 2009-01-15 | Photocatalysis reactor for degrading dioxins in flue gas and method for activating photocatalyst |
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| CN2009100956461A CN101485958B (en) | 2009-01-15 | 2009-01-15 | Photocatalysis reactor for degrading dioxins in flue gas and method for activating photocatalyst |
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| CN101485958A CN101485958A (en) | 2009-07-22 |
| CN101485958B true CN101485958B (en) | 2012-03-14 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104671715B (en) * | 2015-01-26 | 2016-08-24 | 广东源盛生态环保科技有限公司 | A kind of utilize garbage power after the flying dust method of preparing lightweight retaining wall |
| CN109433009B (en) * | 2019-01-14 | 2021-12-17 | 江山市虎鼎环保科技有限公司 | Device and method for reducing toxicity equivalent of dioxin in waste incineration fly ash |
| CN109799314A (en) * | 2019-03-27 | 2019-05-24 | 盛守祥 | A kind of catalyst activity evaluating apparatus and method |
| CN112958070B (en) * | 2021-02-23 | 2022-01-11 | 浙江大学 | Method for preparing dioxin low-temperature degradation composite catalyst by ball milling method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1269330A (en) * | 1999-04-02 | 2000-10-11 | 株式会社日立制作所 | Water purifying apparatus and method thereof |
| CN1494458A (en) * | 2000-12-28 | 2004-05-05 | 有限会社环境设备研究所 | Method of activating photocatalyst and device therefor |
| CN1721002A (en) * | 2003-12-11 | 2006-01-18 | 高超明智公司 | Electro-kinetic air transporter-conditioner system and method to oxidize volatile organic compounds |
| CN1843575A (en) * | 2006-03-29 | 2006-10-11 | 华北电力大学 | Method and apparatus for optic catalytic oxidizing, desulfurizing and denitrifying flue gas simultaneously |
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- 2009-01-15 CN CN2009100956461A patent/CN101485958B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1269330A (en) * | 1999-04-02 | 2000-10-11 | 株式会社日立制作所 | Water purifying apparatus and method thereof |
| CN1494458A (en) * | 2000-12-28 | 2004-05-05 | 有限会社环境设备研究所 | Method of activating photocatalyst and device therefor |
| CN1721002A (en) * | 2003-12-11 | 2006-01-18 | 高超明智公司 | Electro-kinetic air transporter-conditioner system and method to oxidize volatile organic compounds |
| CN1843575A (en) * | 2006-03-29 | 2006-10-11 | 华北电力大学 | Method and apparatus for optic catalytic oxidizing, desulfurizing and denitrifying flue gas simultaneously |
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