CN109999635A - NO in a kind of boiler smokeXSome redox removal methods and removing means - Google Patents
NO in a kind of boiler smokeXSome redox removal methods and removing means Download PDFInfo
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- CN109999635A CN109999635A CN201910363869.5A CN201910363869A CN109999635A CN 109999635 A CN109999635 A CN 109999635A CN 201910363869 A CN201910363869 A CN 201910363869A CN 109999635 A CN109999635 A CN 109999635A
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- flue gas
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
- B01D53/502—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific solution or suspension
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/75—Multi-step processes
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D2251/00—Reactants
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- B01D2251/304—Alkali metal compounds of sodium
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- B01D2255/1023—Palladium
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D2255/20707—Titanium
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/80—Type of catalytic reaction
- B01D2255/802—Photocatalytic
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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Abstract
The invention discloses NO in a kind of boiler smokeXSome redox removal methods and removing means, comprising the following steps: (1) boiler smoke is respectively enterd into photocatalytic oxidation device that at least two-stage be serially connected, successively carries out photochemical catalytic oxidation, NO in the flue gas after photochemical catalytic oxidationXOxidizability is 45~50%.(2) flue gas and the reducing solution reducing solution in mixed feeder after catalysis oxidation are become into atomization flue gas by moment pressurization and flue gas atomization.(3) the atomization flue gas is entered into reduction denitrating tower, is discharged after denitration catalyst filler restores denitration from top.(4) flue gas that denitrating tower is ejected will be restored and enters desulfurizing tower, the qualified discharge after spraying doctor solution desulfurization.Boiler smoke is respectively enterd the photocatalytic oxidation device that at least two-stage is serially connected by the present invention, successively carries out photochemical catalytic oxidation, improves photochemical catalytic oxidation speed, oxidizability controls at different levels are accurate, the reduction denitration effect that ensure that.
Description
Technical field
The present invention relates to industrial waste gas processing technology fields, and in particular to NO in a kind of boiler smokeXRedox removing
Technology.
Background technique
Currently, the nitrogen oxides NO that industrial processes are discharged to atmospherexMainly with NO and NO2Based on, they be acid rain and
The main producers of haze seriously endanger ecological environment and human health.Nitric oxide (NO) accounts for total nitrogen oxide in boiler smoke
(NOx) 95% or more, NO no matter be not easy in water or all to be absorbed in lye, and nitrogen dioxide (NO2) soluble easily in water easy to be de-
It removes, therefore the main problem of denitrating flue gas is to remove NO.
According to NO in flue gas and NO2Different method of denitration can be used: with NO in the difference of content2Based on NOxExhaust gas master
If absorption cleaning；And the NO based on NOxNO can be reduced to harmless N by exhaust gas2, this technique, which is divided into, wants in-furnace temperature
Ask comparison stringent, and catalyst poisoning and burner hearth block the problem of can not all avoid.NO can also be oxidized to NO2It inhales again
Accept reason for medical treatment, common oxidant is O3、KMnO4、NaClO2Deng.After the NO overwhelming majority is aoxidized (also referred to as NO is oxidized), alkali is utilized
Liquid absorbs, and qualified discharge, need to consume more oxidant, with high costs, hinders industrial application.It is reduced for this technology
The thinking of cost has two: first is that oxidant (such as H that selection is cheap2O2Or NaClO), but the oxidation effectiveness of NO is limited, needs to adopt
With supplementary means such as catalysis, and the exploitation of catalyst can not break through SO so far2Poison the problem for causing catalyst deactivation with steam；Two
It is to implement NO quantitatively to aoxidize (i.e. by NO partial oxidation), does not pursue high NOxOxidizability (NOxMiddle NO2Ratio) with save oxidation
Then agent controls NO and NO by the regulation of oxidizability2Ratio, use urea or sodium sulfite, sodium hydrogensulfite as
Reducing agent carries out reduction denitration, high denitration efficiency is ensured while reducing cost, but this technology is difficult to control there are oxidizability
System leads to the problem of reduction effect difference.
Since Japanese Scientists Fujishima and Honda discovery photocatalysis has 50 years history so far, needle is applied to
Exploitation still constantly carrying out, in many photochemical catalysts, TiO2Photochemical catalyst have oxidation activity it is high, it is activity stabilized,
Equal excellent properties itself are not easily decomposed, but so far, it applies and appoints so by considerable restraint, at present in the oxidation processes of exhaust gas
Still several problems restrict industrial application of the photocatalysis technology in exhaust-gas treatment, the quantum yield including catalyst
It is low, it is seen that light utilization efficiency is low, and nanocatalyst separates difficulty etc..
Summary of the invention
The first technical problem to be solved by the present invention is: in view of the deficienciess of the prior art, one kind is provided can
Accurate control NOxOxidizability, the reduction denitration effect guaranteed, and NO at low cost, high-efficient boiler smokeXPart oxygen
Change reduction removal methods.
Second technical problem to be solved by this invention is: being used in view of the deficienciess of the prior art, providing one kind
The efficient removal device of boiler smoke NOx, can accurately control NOxOxidizability, the reduction denitration effect guaranteed, and cost
It is low, high-efficient, stable.
In order to solve the first technical problem mentioned above, the technical scheme is that
NO in a kind of boiler smokeXSome redox removal methods, comprising the following steps:
(1) photochemical catalytic oxidation: boiler smoke is respectively enterd into the photocatalytic oxidation device that at least two-stage is serially connected, successively
Carry out photochemical catalytic oxidation, according to the air inlet oxidizability of every level-one photocatalytic oxidation device and outlet oxidizability regulate and control boiler smoke into
Tolerance；NO in flue gas after photochemical catalytic oxidationXOxidizability is 45~50%.
(2) mixed aerosol: the flue gas after catalysis oxidation is entered into mixed feeder with reducing solution simultaneously, is being mixed into
Reducing solution is atomized by moment pressurization with flue gas in glassware, becomes atomization flue gas.
(3) it restores denitration: the atomization flue gas is entered into reduction denitrating tower, by restoring fill in denitrating tower at least two
It is discharged after layer denitration catalyst filler reduction denitration from top.
(4) desulfurization: will restore the flue gas that denitrating tower is ejected and enter desulfurizing tower, the row up to standard after spraying doctor solution desulfurization
It puts.
As a kind of improved technical solution, loaded along gas flow direction equipped with multiple tracks in the photocatalytic oxidation device
There is the web plate of photochemical catalyst；Visible light source is equipped between the web plate.
As a kind of improved technical solution, the web plate of the negative photocatalyst-bearing, which is negative, is loaded with nano Pd particle/TiO2Light
The glass fiber mesh of catalyst；The visible light source is the >=LED light of 50W.
As a kind of improved technical solution, the nano Pd particle/TiO2The preparation process of photochemical catalyst is photochemical precipitation
Method, Pd deposition are 0.5~2wt%.
As a kind of improved technical solution, the photocatalytic oxidation device is two-stage series connection, first order photochemical catalytic oxidation
After flue gas in NOXOxidizability is 60~95%.
As a kind of improved technical solution, residence time of the boiler smoke in first order photocatalytic oxidation device is 10
~30s；Residence time of the boiler smoke in the photocatalytic oxidation device of the second level is 5~15s.
As a kind of improved technical solution, the denitration catalyst filler is that sintering load has solid super-strong acid SO4- 2--
V2O5/TiO2Honeycomb ceramic plate.
As a kind of preferred technical solution, reduction reaction residence time of the atomization flue gas in reduction denitrating tower is
5~25 seconds.
As a kind of preferred technical solution, the reducing solution in the digester is Na2SO3Or NaHSO3(derive from desulfurization
Slurries) or urea.
To solve above-mentioned second technical problem, the technical scheme is that
A kind of efficient removal device for boiler smoke NOx:
Described device includes at least photocatalytic oxidation device that is serially connected of two-stage；The photocatalytic oxidation device is set respectively
There is gas inlet.
It further include reduction flow container, mixed feeder；The outlet of the reduction flow container and the photocatalytic-oxidation being serially connected
Disguise the import of mixed feeder described in the outlet for the most end level-one photocatalytic oxidation device set.
The outlet of the mixed feeder is sequentially communicated reduction denitrating tower and desulfurizing tower.
As a kind of improved technical solution, the arrival end of the photocatalytic oxidation device and outlet end are respectively equipped with NOx
Detector.
As a kind of improved technical solution, loaded along gas flow direction equipped with multiple tracks in the photocatalytic oxidation device
There is the web plate of photochemical catalyst；Visible light source is equipped between the web plate.
As a kind of preferred technical solution, the photocatalytic oxidation device being serially connected is two-stage series connection；The first order
Photocatalytic oxidation device is equipped with the first gas inlet, the outlet second level photochemical catalytic oxidation of first order photocatalytic oxidation device
The import of device, second level photocatalytic oxidation device are equipped with the second gas inlet；First gas inlet and the second flue gas into
Mouth is respectively equipped with the first electrically-controlled valve and the second electrically-controlled valve, and first electrically-controlled valve and the second electrically-controlled valve and the photocatalytic-oxidation are disguised
The NOx detector that the arrival end and outlet end set are equipped with is each coupled electrically to control system.
As a kind of further preferred technical solution, the load that the second level photocatalytic oxidation device is equipped with has light to urge
Web plate quantity of the web plate quantity of agent less than the negative photocatalyst-bearing that first order photocatalytic oxidation device is equipped with.
As a kind of improved technical solution, the web plate of the negative photocatalyst-bearing, which is negative, is loaded with nano Pd particle/TiO2Light
The glass fiber mesh of catalyst.
As a kind of improved technical solution, the mixed feeder is respectively equipped with smoke inlet and reducing solution entrance, institute
It states reducing solution entrance and is equipped with the inlet tube for protruding into the mixed feeder inner cavity, the inlet tube is equipped with multiple sprays along airflow direction
Fluid apertures；Baffle is equipped between the smoke inlet and reducing solution entrance, the baffle is equipped with fumarole；The reducing solution entrance
Lower section is equipped with mixing chamber, is equipped with an air-flow folded plate in the mixing chamber；The outlet of the mixing chamber is connected with sparge pipe in turn
And nozzle.
As a kind of improved technical solution, the air-flow folded plate includes both ends to intermediate diminishing taper baffling
Plate, the diminution end of the taper baffle plate are equipped with jet-impingement hole, and the diameter of the taper baffle plate is interior with the mixing chamber
Diameter is adapted.
As a kind of improved technical solution, pass through the scalable connection of flange, the spray between the sparge pipe and nozzle
Fixed knob is equipped between liquid pipe and flange.
As a kind of preferred technical solution, the connecting pin of the flange and the sparge pipe is equipped with a connecting tube；Institute
It states sparge pipe and the connecting tube is set-located, fixed knob is equipped between the sparge pipe and the connecting tube.
As a kind of improved technical solution, multilayer denitration catalyst filler is equipped in the reduction denitrating tower.
As a kind of improved technical solution, the denitration catalyst filler is that sintering load has solid super-strong acid SO4- 2--
V2O5/TiO2Honeycomb ceramic plate.
As a kind of improved technical solution, the outlet side of the reduction denitrating tower is equipped with the 3rd NOx detector.
As a kind of preferred technical solution, multilayer lye spray head, every layer of lye spray head are equipped in the desulfurizing tower
Equipped with multiple, and the spray head between adjacent two layers is staggered.
By adopting the above-described technical solution, the beneficial effects of the present invention are:
NO in boiler smoke of the inventionXSome redox removal methods, using at least two-stage photocatalytic oxidation control
NO processedXBoiler smoke is respectively enterd the photocatalytic oxidation device that at least two-stage is serially connected, successively carries out photocatalysis by oxidizability
Oxidation regulates and controls boiler smoke air inflow according to the air inlet oxidizability of every level-one photocatalytic oxidation device and outlet oxidizability；Light is urged
Change NO in the flue gas after aoxidizingXIt is 45~50% that oxidizability, which can be precisely controlled,.Therefore oxidation efficiency can be promoted, oxygen is reduced
Change the residence time, progress of the NOx with oxidation reaction, the concentration reduction of NO, the speed of photochemical catalytic oxidation NO can also drop in flue gas
It is low, therefore do not need in first order catalysis oxidation by its complete oxidation, and it is controlled at certain oxidizability, it is catalyzed in the second level
New unoxidized flue gas is mixed into before oxidation according to oxidizability, NO in mixed flue gas in such second level catalytic oxidizing equipment
Concentration increases, and improves photochemical catalytic oxidation speed, controls final outlet oxidizability according to the oxidizability of catalysis oxidations at different levels；It is at different levels
Oxidizability control is accurate, the reduction denitration effect that ensure that.
The present invention uses visible light catalytic oxidation, since visible light photocatalysis technology reaction speed compares ultraviolet light photocatalysis
Reaction condition is milder, and controllability is stronger, while can also introduce security risk caused by ultraviolet lamp to avoid UV photocatalysis.
Since flue-gas temperature is higher, visible light photocatalysis of the present invention has nano Pd particle/TiO using load2Glass fibre, it is resistance to
High temperature corrosion-resisting ability is strong, while nano Pd particle/TiO2Catalyst visible light catalysis activity is strong, and performance is stablized, and the service life is long.
Flue gas and reducing solution mixing of the present invention after two-stage photochemical catalytic oxidation pass through the mixing of mixed feeder, and flue gas enters
Baffle between mouth and reducing solution entrance is equipped with fumarole, so that gas air pressure moment after fumarole increases, can make
Reducing solution is atomized and is mixed with rapidly；Spray hole in reducing solution entrance designs downwards, consistent with flow of flue gas direction, can be with
It avoids that flue gas is caused to enter reducing solution conveyance conduit because air pressure is excessive, spray hole designs down mixing chamber, is equipped in mixing chamber
Air-flow folded plate, make the full and uniform mixing of gas-liquid two-phase using the cavitation effect of gas, guarantee high reduction reaction efficiency；Together
When sparge pipe and nozzle between by the scalable connection of flange, it is easy to install and use.
The catalytic filler restored in denitrating tower uses solid super-strong acid SO4- 2--V2O5/TiO2As catalyst, due to denitration
Tower interior reaction temperature is not high, therefore composite denitration catalyst need not use temperature to stablize component, SO4- 2--V2O5/TiO2Catalyst
Calcining is carried on honeycomb ceramic plate as filler, can achieve reduction denitration effect well.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples.
Fig. 1 is the structural schematic diagram of the embodiment of the present invention；
Fig. 2 is the structural schematic diagram of mixed feeder of the present invention.
In figure, 1. first order photocatalytic oxidation devices；11. the first gas inlet；12. the first electrically-controlled valve；2. second level light
Catalytic oxidizing equipment；21. the second gas inlet；22. the second electrically-controlled valve；3. web plate；4. visible light source；5.NOx detector；6.
Restore flow container；7. mixed feeder；71. smoke inlet；72. reducing solution entrance；73. inlet tube；74. spray hole；8. baffle；
81. fumarole；9. mixing chamber；91 air-flow folded plates；92. jet-impingement hole；10. sparge pipe；11. nozzle；12. flange；13. fixed
Knob；14. restoring denitrating tower；15. desulfurizing tower；16. denitration catalyst filler；17. the 3rd NOx detector；18. spray head.
Specific embodiment
With reference to the accompanying drawings and examples, the present invention is further explained.It should be understood that these embodiments are merely to illustrate this hair
It is bright rather than limit the scope of the invention.In addition, it should also be understood that, after reading the content taught by the present invention, art technology
Personnel can make various changes or modifications the present invention, and such equivalent forms equally fall within the application the appended claims and limited
Fixed range.
As depicted in figs. 1 and 2, a kind of efficient removal device for boiler smoke NOx: described device includes being serially connected
Two-stage photocatalytic oxidation device；First order photocatalytic oxidation device 1 is equipped with the first gas inlet 11, first order photochemical catalytic oxidation
The import of the outlet second level photocatalytic oxidation device 2 of device 1, second level photocatalytic oxidation device 2 are equipped with the second flue gas
Import 21；First gas inlet 11 and the second gas inlet 21 are respectively equipped with the first electrically-controlled valve 12 and the second electrically-controlled valve 22；
The web plate 3 of the negative photocatalyst-bearing of multiple tracks is equipped in the photocatalytic oxidation device along gas flow direction；Between the web plate 3
Equipped with visible light source 4；The smoke inlet end of the photocatalytic oxidation device and smoke outlet are respectively equipped with NOx detector 5.
It further include reduction flow container 6, mixed feeder 7；The outlet of the reduction flow container 6 and the outlet of second level photocatalytic oxidation device 2
It is connected to the import of the mixed feeder 7；The mixed feeder 7 is respectively equipped with smoke inlet 71 and reducing solution entrance 72, institute
It states reducing solution entrance 72 and is equipped with the inlet tube 73 for protruding into 7 inner cavity of mixed feeder, the inlet tube 73 is set along airflow direction
There are multiple spray holes 74.Baffle 8 is equipped between the smoke inlet 71 and reducing solution entrance 72, the baffle 8 is equipped with jet
Hole 81；It is equipped with mixing chamber 9 below the reducing solution entrance 72, is equipped with an air-flow folded plate 91 in the mixing chamber 9；The air-flow
Folded plate 91 includes both ends to intermediate diminishing taper baffle plate, and the diminution end of the taper baffle plate is equipped with jet-impingement hole
92, the diameter of the taper baffle plate and the internal diameter of the mixing chamber 9 are adapted.The outlet of the mixing chamber 9 is connected in turn
Sparge pipe 10 and nozzle 11, by the scalable connection of flange 12 between the sparge pipe 10 and nozzle 11, the sparge pipe 10 with
Fixed knob 13 is equipped between flange 12.The outlet of the mixed feeder 7 is sequentially communicated reduction denitrating tower 14 and desulfurizing tower 15.
Multilayer denitration catalyst filler 16 is equipped in the reduction denitrating tower 14, the outlet side of the reduction denitrating tower 14 is equipped with the 3rd NOx
Detector 17.Be equipped with multilayer lye spray head 18 in the desulfurizing tower 15, every layer of lye spray head 18 be equipped with it is multiple, and adjacent two
Spray head 18 between layer is staggered.
As a kind of preferred embodiment, first electrically-controlled valve and the second electrically-controlled valve and the photocatalytic oxidation device
The NOx detector that is equipped with of outlet end be each coupled electrically to control system.The load that the second level photocatalytic oxidation device is equipped with
The web plate quantity for having photochemical catalyst is twice, the web plate quantity for the negative photocatalyst-bearing that first order photocatalytic oxidation device is equipped with
It is three.The web plate of the negative photocatalyst-bearing, which is negative, is loaded with nano Pd particle/TiO2The glass fiber mesh of photochemical catalyst.The method
The blue connecting pin with the sparge pipe is equipped with a connecting tube；The sparge pipe and the connecting tube are set-located, the spray
Fixed knob is equipped between liquid pipe and the connecting tube.The denitration catalyst filler is that sintering load has solid super-strong acid SO4- 2--
V2O5/TiO2Honeycomb ceramic plate.
Embodiment 1
(1) boiler smoke: being respectively enterd the photocatalytic oxidation device of two-stage series connection by photochemical catalytic oxidation, is successively carried out light and is urged
Change oxidation, is equipped with the web plate of three negative photocatalyst-bearings in first order photocatalytic oxidation device along gas flow direction；Second
Being equipped with twice load along gas flow direction in grade photocatalytic oxidation device has nano Pd particle/TiO2Glass fibre web plate；Institute
State the LED light that 50W is equipped between web plate.Residence time of the boiler smoke in first order photocatalytic oxidation device is 15s；Boiler
Residence time of the flue gas in the photocatalytic oxidation device of the second level is 10s.NO in flue gas after first order photochemical catalytic oxidationX
Oxidizability is 75%, NO in the flue gas after the photochemical catalytic oxidation of the second levelXOxidizability is 50%.According to every level-one photocatalytic-oxidation
Disguise the air inlet oxidizability set and outlet oxidizability regulation boiler smoke air inflow.
(2) mixed aerosol: the flue gas after catalysis oxidation is entered into mixed feeder with reducing solution simultaneously, is being mixed into
Reducing solution is atomized by moment pressurization with flue gas in glassware, becomes atomization flue gas.
(3) it restores denitration: the atomization flue gas is entered into reduction denitrating tower, it is negative by two layers filled in reduction denitrating tower
It is loaded with solid super-strong acid SO4- 2--V2O5/TiO2Honeycomb ceramic plate reduction denitration after from top be discharged；The atomization flue gas is also
The reduction reaction residence time in former denitrating tower is 10 seconds.
(4) desulfurization: the flue gas that denitrating tower is ejected will be restored and enter desulfurizing tower, by spraying Na2SO3After doctor solution desulfurization
Qualified discharge.
Embodiment 2
(1) boiler smoke: being respectively enterd the photocatalytic oxidation device of two-stage series connection by photochemical catalytic oxidation, is successively carried out light and is urged
Change oxidation, is equipped with the web plate of three negative photocatalyst-bearings in first order photocatalytic oxidation device along gas flow direction；Second
Being equipped with twice load along gas flow direction in grade photocatalytic oxidation device has nano Pd particle/TiO2Glass fibre web plate；Institute
State the LED light that 50W is equipped between web plate.Residence time of the boiler smoke in first order photocatalytic oxidation device is 18s；Boiler
Residence time of the flue gas in the photocatalytic oxidation device of the second level is 12s.NO in flue gas after first order photochemical catalytic oxidationX
Oxidizability is 80%, NO in the flue gas after the photochemical catalytic oxidation of the second levelXOxidizability is 49%.According to every level-one photocatalytic-oxidation
Disguise the air inlet oxidizability set and outlet oxidizability regulation boiler smoke air inflow.
(2) mixed aerosol: the flue gas after catalysis oxidation is entered into mixed feeder with reducing solution simultaneously, is being mixed into
Reducing solution is atomized by moment pressurization with flue gas in glassware, becomes atomization flue gas.
(3) it restores denitration: the atomization flue gas is entered into reduction denitrating tower, it is negative by two layers filled in reduction denitrating tower
It is loaded with solid super-strong acid SO4- 2--V2O5/TiO2Honeycomb ceramic plate reduction denitration after from top be discharged；The atomization flue gas is also
The reduction reaction residence time in former denitrating tower is 15 seconds.
(4) desulfurization: the flue gas that denitrating tower is ejected will be restored and enter desulfurizing tower, by spraying Na2SO3Or NaHSO3Desulfurization
Qualified discharge after liquid desulfurization.
Embodiment 3
(1) boiler smoke: being respectively enterd the photocatalytic oxidation device of two-stage series connection by photochemical catalytic oxidation, is successively carried out light and is urged
Change oxidation, is equipped with the web plate of three negative photocatalyst-bearings in first order photocatalytic oxidation device along gas flow direction；Second
Being equipped with twice load along gas flow direction in grade photocatalytic oxidation device has nano Pd particle/TiO2Glass fibre web plate；Institute
State the LED light that 50W is equipped between web plate.Residence time of the boiler smoke in first order photocatalytic oxidation device is 10s；Boiler
Residence time of the flue gas in the photocatalytic oxidation device of the second level is 8s.NO in flue gas after first order photochemical catalytic oxidationX
Oxidizability is 70%, NO in the flue gas after the photochemical catalytic oxidation of the second levelXOxidizability is 50%.According to every level-one photocatalytic-oxidation
Disguise the air inlet oxidizability set and outlet oxidizability regulation boiler smoke air inflow.
(2) mixed aerosol: the flue gas after catalysis oxidation is entered into mixed feeder with reducing solution simultaneously, is being mixed into
Reducing solution is atomized by moment pressurization with flue gas in glassware, becomes atomization flue gas.
(3) it restores denitration: the atomization flue gas is entered into reduction denitrating tower, it is negative by two layers filled in reduction denitrating tower
It is loaded with solid super-strong acid SO4- 2--V2O5/TiO2Honeycomb ceramic plate reduction denitration after from top be discharged；The atomization flue gas is also
The reduction reaction residence time in former denitrating tower is 12 seconds.
(4) desulfurization: the flue gas that denitrating tower is ejected will be restored and enter desulfurizing tower, by spraying NaHSO3After doctor solution desulfurization
Qualified discharge.
Embodiment 1-3 treated boiler smoke is shown in Table 1 through Testing index situation.
Table 1
Note: boiler draft fan delivery is 100000Nm3/h。
Claims (9)
1. NO in a kind of boiler smokeXSome redox removal methods, it is characterised in that the following steps are included:
(1) photochemical catalytic oxidation: boiler smoke is respectively enterd into the photocatalytic oxidation device that at least two-stage is serially connected, is successively carried out
Photochemical catalytic oxidation regulates and controls boiler smoke air inlet according to the air inlet oxidizability of every level-one photocatalytic oxidation device and outlet oxidizability
Amount；NO in flue gas after photochemical catalytic oxidationXOxidizability is 45~50%；
(2) mixed aerosol: the flue gas after photochemical catalytic oxidation is entered into mixed feeder with reducing solution simultaneously, in mixed feeding
Reducing solution is atomized by moment pressurization with flue gas in device, becomes atomization flue gas；
(3) it restores denitration: the atomization flue gas is entered into reduction denitrating tower, it is de- by least two layers filled in reduction denitrating tower
Nitre catalytic filler is discharged after restoring denitration from top；
(4) desulfurization: will restore the flue gas that denitrating tower is ejected and enter desulfurizing tower, the qualified discharge after spraying doctor solution desulfurization.
2. NO in boiler smoke as described in claim 1XSome redox removal methods, it is characterised in that: the photocatalysis
The web plate of the negative photocatalyst-bearing of multiple tracks is equipped in oxidation unit along gas flow direction；Visible light light is equipped between the web plate
Source.
3. NO in boiler smoke as claimed in claim 2XSome redox removal methods, it is characterised in that: the web plate is
Load has nano Pd particle/TiO2The glass fiber mesh of photochemical catalyst；The visible light source is the >=LED light of 50W.
4. NO in boiler smoke as described in claim 1XSome redox removal methods, it is characterised in that: the photocatalysis
Oxidation unit is two-stage series connection, NO in the flue gas after first order photochemical catalytic oxidationXOxidizability is 60~95%.
5. NO in boiler smoke as claimed in claim 4XSome redox removal methods, it is characterised in that: boiler smoke exists
Residence time in first order photocatalytic oxidation device is 10~30s；Residence time in the photocatalytic oxidation device of the second level
For 5~15s.
6. NO in boiler smoke as described in claim 1XSome redox removal methods, it is characterised in that: the denitration is urged
Changing filler is that sintering load has solid super-strong acid SO4- 2--V2O5/TiO2Honeycomb ceramic plate.
7. a kind of efficient removal device for boiler smoke NOx, it is characterised in that:
Described device includes at least photocatalytic oxidation device that is serially connected of two-stage；The photocatalytic oxidation device is respectively equipped with cigarette
Gas import；
It further include reduction flow container, mixed feeder；The outlet of the reduction flow container and the photocatalytic-oxidation makeup being serially connected
The import of mixed feeder described in the outlet for the most end level-one photocatalytic oxidation device set；
The outlet of the mixed feeder is sequentially communicated reduction denitrating tower and desulfurizing tower.
8. being used for the efficient removal device of boiler smoke NOx as claimed in claim 7, it is characterised in that: the mixed feeding
Device is respectively equipped with smoke inlet and reducing solution entrance, and the reducing solution entrance is equipped with the feed liquor for protruding into the mixed feeder inner cavity
Pipe, the inlet tube are equipped with multiple spray holes along airflow direction；Baffle, institute are equipped between the smoke inlet and reducing solution entrance
Baffle is stated equipped with fumarole；It is equipped with mixing chamber below the reducing solution entrance, is equipped with an air-flow folded plate in the mixing chamber；
The outlet of the mixing chamber is connected with sparge pipe and nozzle in turn.
9. being used for the efficient removal device of boiler smoke NOx as claimed in claim 8, it is characterised in that: the air-flow folded plate
Including both ends to intermediate diminishing taper baffle plate, the diminution end of the taper baffle plate is equipped with jet-impingement hole, described
The internal diameter of the diameter of taper baffle plate and the mixing chamber is adapted.
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