CN102794107A - Method and system for catalyzing and degrading dioxin - Google Patents
Method and system for catalyzing and degrading dioxin Download PDFInfo
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- CN102794107A CN102794107A CN2012103207194A CN201210320719A CN102794107A CN 102794107 A CN102794107 A CN 102794107A CN 2012103207194 A CN2012103207194 A CN 2012103207194A CN 201210320719 A CN201210320719 A CN 201210320719A CN 102794107 A CN102794107 A CN 102794107A
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- dioxin
- catalyst
- flue gas
- tio
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Abstract
The invention provides a method and a system for catalyzing and degrading dioxin. The system comprises an SCR (Selective Catalytic Reduction) reactor, wherein a catalyst is filled in the SCR reactor, and the catalyst consists of a transition metal oxide type catalyst V2O5-WO3/TiO2 and V2O5-WO3/TiO2 loaded with noble metals of Pd and Pt. The method and the system can be suitable for degrading dioxin in smoke such as sintering smoke of iron and steel plants, solid waste burning smoke and the like. According to the invention, because the SCR reactor is adopted, dioxin pollutants can be degraded under a low-temperature condition (100-300 DEG C), so that the SCR reactor has the characteristics of low energy consumption and good degradation effect and wide application prospect.
Description
Technical field
The present invention relates to a kind of method and system of catalytic degradation dioxin, belong to the flue gas processing technology field.
Background technology
Dioxin (PCDD/Fs) be polychlorinated dibenzo-2 uh English (polychlorinated dibenzo-p-dioxin; PCDDs) and polychlorinated dibenzo (polychlorinated dibenzofuran, the general designation of two types of almost plane shape aromatic heterocyclic compounds PCDFs).Dioxin is one type of persistence organic pollutant (Persistent Organic Pollutants of greatest concern in the present global range; POPs); Dioxin not only has high toxicity; Also humans and animals is had significantly carcinogenic, teratogenesis, mutagenic " three cause " effect, and can influence reproductive function, disturb internal system, therefore be known as " poison in century ".In view of the serious harmfulness of dioxin; Some countries of the world allow intake to assess with tissue to it; One day permission intake announcing like the World Health Organization is 1～4pg TCDD or TEQ/kg-day, and allowing intake January is 70pg TCDD or TEQ/kg-month.
Because dioxin is a kind of organic matter that is very difficult to degrade; Gas phase condition is down if will destroy its chemical molecular structure; Usually need the high temperature more than 800 ℃; Thereby the degraded that causes dioxin need expend the effect of higher heat and degraded is difficult to reach environmental protection requirement, still can pollute environment.
Summary of the invention
The present invention solves higher, the problem of environment pollution caused of energy consumption that exists in the existing dioxin degradation technique, and then a kind of method and system of catalytic degradation dioxin are provided, and the invention provides following technical scheme:
A kind of method of catalytic degradation dioxin comprises:
The flue gas that will contain dioxin feeds in the SCR reactor that catalyst is housed and carries out degradation reaction, and said catalyst is a transition metal oxide type catalyst V
2O
5-WO
3/ TiO
2Or the V of carried noble metal Pd, Pt
2O
5-WO
3/ TiO
2
A kind of system of catalytic degradation dioxin comprises the SCR reactor, in said SCR reactor, catalyst is housed, and said catalyst is a transition metal oxide type catalyst V
2O
5-WO
3/ TiO
2Or the V of carried noble metal Pd, Pt
2O
5-WO
3/ TiO
2
Technical scheme provided by the invention can be applicable to the degraded dioxin processing of flue gases such as steel works sintering flue gas, solid waste incineration fume; The present invention adopts the SCR reactor, can be under cryogenic conditions (100-300 ℃) degraded dioxin pollution thing, have that energy consumption is lower, degradation effect characteristics preferably, have broad application prospects.
Description of drawings
In order to be illustrated more clearly in the technical scheme of the embodiment of the invention; The accompanying drawing of required use is done to introduce simply in will describing embodiment below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work property, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the schematic flow sheet of the method for the catalytic degradation dioxin that provides of this specific embodiment;
Fig. 2 is the structural representation of the system of the catalytic degradation dioxin that provides of this specific embodiment.
The specific embodiment
To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
Technical scheme provided by the present invention is based on SCR (Selective Catalyst Reduction; SCR) technology; The existing SCR technology is mainly used in the removal of nitrogen oxide in the flue gas, and the present invention is with the degraded field of SCR technical application to dioxin.Below in conjunction with Figure of description the technical scheme that the present invention proposes is elaborated, as shown in Figure 1, the method for the dioxin of degrading accordingly comprises:
Concrete, thermoregulator inside is resistance heated, when the flue gas that contains dioxin did not satisfy SCR reactor degraded dioxin temperature requirement, thermoregulator was started working, and the import flue gas heating is satisfied design temperature up to flue gas in the SCR device; Under the energy efficient condition, can the import flue gas not made when being heated by resistive, open high-temperature flue gas (300 ℃ ~ 800 ℃) import, regulate high-temperature flue gas inlet gas flow, satisfy design temperature in the SCR reactor up to flue-gas temperature; Or use resistance heater and high-temperature flue gas to regulate mouthful simultaneously according to on-the-spot physical condition.
Concrete, owing in the SCR reactor particle concentration in the flue gas is had relatively high expectations, therefore can use sack cleaner to remove particle at leading portion.And, can scribble a small amount of V in the cloth bag
2O
5-WO
3/ TiO
2The V of catalyst or carried noble metal Pd, Pt
2O
5-WO
3/ TiO
2, can play dedusting and the effect of degraded dioxin in advance.
Concrete, in transition metal oxide type catalyst V
2O
5-WO
3/ TiO
2In, active component V
2O
5Mass percent be 1%-6%, V
2O
5And WO
3Mass ratio be 1:1; Or at above-mentioned V
2O
5-WO
3/ TiO
2Doped precious metal Pt and Pd in the catalyst, adopting infusion process respectively is 5% V at mass ratio
2O
5-WO
3/ TiO
2The Pt of load 1% in the catalyst, 1% Pd and 0.5% Pt and 0.5% Pd.The SCR reactor assembly can use one or more layers honeycomb fashion or corrugated plate shape catalyst; Acoustic wave ash ejector is loaded on surface at catalyst, can increase the specific area of per volume of catalyst like this, and assurance fully contacts with flue gas; Thereby saving catalyst consumption; And because the loose structure characteristics of himself add at catalyst surface and load acoustic wave ash ejector, thereby are not easy to be stopped up by particle.Degradation reaction is discharged residual gas after accomplishing from chimney, thereby reaches the purpose that the degraded dioxin does not pollute the environment again.
The specific embodiment of the present invention also provides a kind of system of catalytic degradation dioxin, and is as shown in Figure 2, comprises thermoregulator 1, sack cleaner 2 and SCR reactor 3; Thermoregulator 1 is used for the temperature of the flue gas that contains dioxin is adjusted to 170 ~ 300 ℃; Sack cleaner 2 is used for removing the particle of the flue gas that contains dioxin; And on the cloth bag of sack cleaner 2, scribble the catalyst of degraded dioxin; In SCR reactor 3, catalyst is housed, concrete method to set up is: one or more layers the honeycomb fashion or the catalyst of corrugated plate shape are housed in SCR reactor 3, and load acoustic wave ash ejector at catalyst surface.Catalyst can adopt transition metal oxide type catalyst V
2O
5-WO
3/ TiO
2Or the V of carried noble metal Pd, Pt
2O
5-WO
3/ TiO
2, the V of carried noble metal Pd, Pt wherein
2O
5-WO
3/ TiO
2Adopting infusion process respectively is 5% V at mass ratio
2O
5-WO
3/ TiO
2Be responsible for the Pt of 1% Pt, 1% Pd and 0.5% and two kinds of prescriptions of Pd of 0.5% in the catalyst.
Concrete, be example with the catalytic degradation of dioxin in certain steel works sintering flue gas, the state of its flue gas is:
Form: SO
2: 300-600mg/m
3NO
X: 200-400mg/m
3Bioxin: 3-10ngTEQ; Particle :≤10mg/m
3
Intake air temperature: 150 ℃;
Pressure: normal, low pressure is considered.
At first select transition metal oxide type catalyst V
2O
5-WO
3/ TiO
2, active component V
2O
5Mass ratio be 1%-6%, V
2O
5And WO
3Mass ratio all be 1:1,170 ~ 300 ℃ of the bests of catalyst operating temperature range.By this system that connects shown in Figure 2.About 150 ℃ of import sinter fume temperature, making input gas temperature through thermoregulator is about 260 ℃.
The import flue gas is raised to about 260 ℃, passes through sack cleaner again, scribbles a small amount of V in the cloth bag
2O
5-WO
3/ TiO
2Catalyst can play dedusting and the effect of degraded dioxin in advance.Flue gas enters in the SCR reactor then, adopts the honeycomb fashion catalyst in the SCR reactor, and is extremely low through dustiness in the flue gas after the sack cleaner, can guarantee effective work of SCR catalyst.
After degraded, discharge the NOx of gas :≤40mg/m
3Bioxin :≤1ngTEQ/m
3
The technical scheme that adopts this specific embodiment to provide can be applicable to the dioxin degradation treatment of flue gases such as steel works sintering flue gas, solid waste incineration fume; The present invention adopts the SCR reactor, can be under cryogenic conditions (100-300 ℃) degraded dioxin pollution thing; Thereby the catalyst that the present invention uses adopts honeycomb fashion or corrugated plate shape can effectively contact catalytic degradation dioxin pollution thing with flue gas; The invention has the advantages that and effectively to remove outside the dioxin organic matter, can also remove part NOx.
The above; Be merely the preferable specific embodiment of the present invention; But protection scope of the present invention is not limited thereto; Any technical staff who is familiar with the present technique field is in the technical scope that the embodiment of the invention discloses, and the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claim.
Claims (9)
1. the method for a catalytic degradation dioxin is characterized in that, comprising:
The flue gas that will contain dioxin feeds in the SCR reactor that catalyst is housed and carries out degradation reaction, and said catalyst is a transition metal oxide type catalyst V
2O
5-WO
3/ TiO
2V with carried noble metal Pd, Pt
2O
5-WO
3/ TiO
2
2. the method for degraded dioxin according to claim 1 is characterized in that, in said transition metal oxide type catalyst V
2O
5-WO
3/ TiO
2In, active component V
2O
5Mass percent be 1%-6%, V
2O
5And WO
3Mass ratio be 1:1; At above-mentioned V
2O
5-WO
3/ TiO
2Doped precious metal Pt and Pd in the catalyst, adopting infusion process respectively is 5% V at mass ratio
2O
5-WO
3/ TiO
2The Pt of load 1% in the catalyst, 1% Pd and 0.5% Pt and 0.5% Pd.
3. the method for degraded dioxin according to claim 1; It is characterized in that, before the flue gas that will contain dioxin feeds the SCR reactor, also comprise: the said temperature that contains the flue gas of dioxin is adjusted to 170 ~ 300 ℃ through directly from incineration flue gas, high-temperature flue gas being imported in the thermoregulator (1).
4. the method for degraded dioxin according to claim 1 is characterized in that, before the flue gas that will contain dioxin feeds the SCR reactor, also comprises: through thermoregulator the said temperature that contains the flue gas of dioxin is adjusted to 170 ~ 300 ℃.
5. according to the method for claim 3 or 4 described degraded dioxin; It is characterized in that; In that being adjusted to after 170 ~ 300 ℃, the said temperature that contains the flue gas of dioxin also comprises: remove the particle in the said flue gas that contains dioxin, regulate the optimum temperature that flue-gas temperature satisfies corresponding catalyst reaction.
6. the system of a catalytic degradation dioxin comprises the SCR reactor, it is characterized in that, in said SCR reactor, catalyst is housed, and said catalyst is a transition metal oxide type catalyst V
2O
5-WO
3/ TiO
2V with carried noble metal Pd, Pt
2O
5-WO
3/ TiO
2
7. the system of degraded dioxin according to claim 6 is characterized in that, this system also comprises thermoregulator, is used for the temperature of the flue gas that contains dioxin is adjusted to 170 ~ 300 ℃.
8. the system of degraded dioxin according to claim 6 is characterized in that, this system also comprises sack cleaner, is used for removing the particle of the flue gas that contains dioxin, and on the cloth bag of said sack cleaner, scribbles the catalyst of degraded dioxin.
9. the system of degraded dioxin according to claim 6 is characterized in that, one or more layers the honeycomb fashion or the catalyst of corrugated plate shape are housed in said SCR reactor, and loads acoustic wave ash ejector at said catalyst surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103207194A CN102794107A (en) | 2012-08-31 | 2012-08-31 | Method and system for catalyzing and degrading dioxin |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103207194A CN102794107A (en) | 2012-08-31 | 2012-08-31 | Method and system for catalyzing and degrading dioxin |
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|---|---|
| CN102794107A true CN102794107A (en) | 2012-11-28 |
Family
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|---|---|---|---|
| CN2012103207194A Pending CN102794107A (en) | 2012-08-31 | 2012-08-31 | Method and system for catalyzing and degrading dioxin |
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Cited By (3)
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| CN107020012A (en) * | 2016-02-02 | 2017-08-08 | 清华大学 | A kind of organic pollution catalytic degradation system |
| CN109799314A (en) * | 2019-03-27 | 2019-05-24 | 盛守祥 | A kind of catalyst activity evaluating apparatus and method |
| CN110056889A (en) * | 2019-05-27 | 2019-07-26 | 桂林航天工业学院 | A kind of refuse burning system and method preventing the synthesis of dioxin low temperature using catalysis burning |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN109799314A (en) * | 2019-03-27 | 2019-05-24 | 盛守祥 | A kind of catalyst activity evaluating apparatus and method |
| CN110056889A (en) * | 2019-05-27 | 2019-07-26 | 桂林航天工业学院 | A kind of refuse burning system and method preventing the synthesis of dioxin low temperature using catalysis burning |
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Application publication date: 20121128 |