CN203108437U

CN203108437U - System for performing catalytic degradation on dioxin

Info

Publication number: CN203108437U
Application number: CN201220443818.7U
Authority: CN
Inventors: 吴昌敏; 盛守祥; 陆勇; 林艳霞; 肖庆聪; 陈瑜; 黄�俊
Original assignee: Csd Beijing Technology Development Co Ltd; Sino German (beijing) Environmental Research Institute Co Ltd
Current assignee: Csd Beijing Technology Development Co Ltd; Sino German (beijing) Environmental Research Institute Co Ltd
Priority date: 2012-08-31
Filing date: 2012-08-31
Publication date: 2013-08-07
Anticipated expiration: 2022-08-31

Abstract

The utility model provides a system for performing catalytic degradation on dioxin. The system comprises a selective catalytic reduction (SCR) reactor, wherein a catalyst is filled in the SCR reactor; and a transition metal oxide catalyst V2O5-WO3/TiO2 and V2O5-WO3/TiO2 loaded with precious metals Pd and Pt is used as the catalyst. The system can be applied to degrading dioxin in sintering flue gas, solid waste sintering flue gas and other flue gases in steel plants; and moreover, by employing the SCR reactor, the dioxin and other pollutants can be degraded under the low-temperature conditions of 100-300 DEG C, and the system has the characteristics of low energy consumption and good degradation effect and has wide application prospects.

Description

A kind of system of catalytic degradation dioxin

Technical field

The utility model relates to a kind of system of catalytic degradation dioxin, belongs 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 class almost plane shape aromatic heterocyclic compounds PCDFs).Dioxin is a class 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 had significantly carcinogenic, teratogenesis, mutagenic " three cause " effect, and can influence reproductive function, interference internal system, therefore be known as " poison in century ".In view of the serious harmfulness of dioxin, some countries of the world and tissue allow intake to assess to it, one day permission intake announcing as the World Health Organization is 1～4pg TCDD or TEQ/kg-day, and allowing intake January is 70pgTCDD or TEQ/kg-month.

Because dioxin is a kind of organic matter that is very difficult to degrade, under the gas phase condition 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 utility model is to solve higher, the problem of environment pollution caused of energy consumption that exists in the existing dioxin degradation technique, and then a kind of system of catalytic degradation dioxin is provided, and the utility model provides following technical scheme:

A kind of system of catalytic degradation dioxin comprises the SCR reactor, in described SCR reactor catalyst is housed, and described catalyst is 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 technical scheme that the utility model provides can be applicable to the dioxin degradation treatment of flue gases such as steel works sintering flue gas, solid waste incineration fume; The utility model 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 utility model embodiment, the accompanying drawing of required use is done to introduce simply in will describing embodiment below, apparently, accompanying drawing in describing below only is embodiment more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.

Fig. 1 is the structural representation of the system of the catalytic degradation dioxin that provides of this specific embodiment.

The specific embodiment

Below in conjunction with the accompanying drawing among the utility model embodiment, the technical scheme among the utility model embodiment is clearly and completely described, obviously, described embodiment only is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that obtains under the creative work prerequisite, all belong to the scope of the utility model protection.

Technical scheme provided by the utility model 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 utility model is applied to the SCR technology in the degraded field of dioxin.Below in conjunction with Figure of description the technical scheme that the utility model proposes is elaborated, as shown in Figure 1, the system of the dioxin of degrading accordingly comprises thermoregulator 1, sack cleaner 2 and SCR reactor 3; Thermoregulator 1 is adjusted to 170～300 ℃ for the temperature of the flue gas that will contain dioxin, sack cleaner 2 is used for removing the particle of the flue gas that contains dioxin, and scribble the catalyst of degraded dioxin at the cloth bag of sack cleaner 2, in SCR reactor 3, catalyst is housed, concrete method to set up is: one or more layers 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 ₂The Pt of load 1% in the catalyst, 1% Pd and 0.5% Pt and two kinds of prescriptions of Pd of 0.5%.

The system works principle of the degraded dioxin that this specific embodiment provides is: thermoregulator is inner to be resistance heated, when the flue gas that contains dioxin does not satisfy SCR reactor degraded dioxin temperature requirement, thermoregulator is started working, and heating is satisfied design temperature up to flue gas in the SCR device to the import flue gas; 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.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 the effect of dedusting and pre-degraded dioxin.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, 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.After degradation reaction is finished residual gas is discharged from chimney, thereby reach the purpose that the degraded dioxin does not pollute the environment again.

Catalytic degradation with dioxin in certain steel works sintering flue gas is example, and the state of its flue gas is:

Form: SO ₂: 300-600mg/m ³NOX:200-400mg/m ³Dioxin: 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 1.About 150 ℃ of import sinter fume temperature, making input gas temperature by 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 the effect of dedusting and pre-degraded dioxin.Flue gas enters in the SCR reactor then, adopts the honeycomb fashion catalyst in the SCR reactor, and is extremely low by 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 ³Dioxin :≤1ngTEQ/m ³

The technical scheme that adopts this specific embodiment to provide can be applicable to that the degraded dioxin of flue gases such as steel works sintering flue gas, solid waste incineration fume is handled; The utility model adopts the SCR reactor, can be under cryogenic conditions (100-300 ℃) degraded dioxin pollution thing; Thereby the catalyst that the utility model uses adopts honeycomb fashion or corrugated plate shape can effectively contact catalytic degradation dioxin pollution thing with flue gas; Advantage of the present utility model is can effectively remove outside the dioxin organic matter, can also remove part NOx.

The above; it only is the preferable specific embodiment of the utility model; but protection domain of the present utility model is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the utility model embodiment discloses; the variation that can expect easily or replacement all should be encompassed within the protection domain of the present utility model.Therefore, protection domain of the present utility model should be as the criterion with the protection domain of claim.

Claims

1. the system of a catalytic degradation dioxin comprises the SCR reactor, it is characterized in that, in described SCR reactor catalyst is housed, and described catalyst is one or more layers honeycomb fashion or corrugated plate shape setting in described SCR reactor.

2. the system of degraded dioxin according to claim 1 is characterized in that, this system also comprises thermoregulator, and the temperature that is used for containing the flue gas of dioxin is adjusted to 170～300 ℃.

3. the system of degraded dioxin according to claim 1 is characterized in that, this system also comprises sack cleaner, is used for removing the particle of the flue gas that contains dioxin, and scribbles the catalyst of degraded dioxin at the cloth bag of described sack cleaner.

4. the system of degraded dioxin according to claim 1 is characterized in that, loads acoustic wave ash ejector at described catalyst surface.