CN105854558B - A kind of sintering flue gas synchronized desulfuring and denitrifying technique - Google Patents
A kind of sintering flue gas synchronized desulfuring and denitrifying technique Download PDFInfo
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- B01D53/34—Chemical or biological purification of waste gases
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- B01D53/34—Chemical or biological purification of waste gases
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Abstract
Include that flue gas is sent into absorption tower to be discharged by absorption tower top with after the reverse haptoreaction of circulating absorption solution that tower top spraying layer sprays the present invention relates to a kind of sintering flue gas synchronized desulfuring and denitrifying technique；The flue gas enters absorption tower by the smoke inlet in the middle part of absorption tower, is discharged successively by the exhanst gas outlet at the top of absorption tower with after the reverse haptoreaction of circulating absorption solution by least one layer of photochemical reaction layer, packing layer and the spraying layer of the setting of tower top；The circulating absorption solution sprayed by absorption tower top spraying layer is successively after packing layer, at least one layer of photochemical reaction layer and the reverse haptoreaction of flue gas, photochemical reaction regeneration is carried out by the photochemical reaction layer of absorption tower lower part, then it is sent to Photocatalytic Regeneration reaction system and is regenerated by absorb the bottom of the tower, the spraying layer that absorption tower top is transmitted back to after filling into ammonium hydroxide and oxalic acid in regenerating slurry tank sprays into tower.Present invention process is simple, operating cost is low, low energy consumption, control is easy, denitration effect is good, byproduct is high-quality.
Description
Technical field
The present invention relates to a kind of flue gas ammonia process synchronized desulfuring and denitrifying technique of field of environment protection, specifically a kind of sintering cigarettes
Gas synchronized desulfuring and denitrifying technique.
Background technology
Wet method simultaneous SO_2 and NO removal technology is the hot spot that sintering flue gas administers area research, mainly there is oxidation absorption process and network
Close two class of absorption process.
(1) oxidizing process is that NO is oxidized to NO2Afterwards, denitration simultaneously is realized in wet desulphurisation system.NO in NOx2Have preferably
Water solubility, but 90% or more NOx is NO in flue gas, water-soluble extremely low, in order to improve denitration effect, need to be oxidized to NO
NO2, then denitration simultaneously is realized in wet desulphurisation system.Oxidation process divides gas phase and liquid phase：Gaseous oxidizing agent has ClO2、Cl2、
O3、H2O2Deng；Oxygen in Liquid agent has HNO3、KMnO4、NaClO2、HClO3、H2O2、NaClO、KBrO3、K2Br2O7Deng wherein chloric acid
Class, O3、H2O2It is the oxidant of most study.Gas phase oxidation process condition is harsher, and oxidation rate is slow, and gas has corruption more
Corrosion and toxicity, operational process risk are larger；The laboratory research of liquid-phase oxidation process shows there is preferable effect, can be with alkali
Liquid absorption process cooperates with, but solution cycle and absorbing liquid after-treatment system are more complex.
H2O2Denitration is the hot spot in oxidizing process, and there are three types of denitration technology routes：1. spraying into H into high-temperature flue2O2,
It is excited using flue high temperature and generates OH and HO2Equal free radicals realize NO oxidations, belong to gaseous oxidation；2. exciting H by UV2O2
It generates free radicals and is reacted with NOx, reaction temperature can be reduced；3. being absorbed in spray column internal oxidition using wet method mode, reach removing
The purpose of NOx.The technology category high-level oxidation technology, is in laboratory stage both at home and abroad.This method is at for practical flue gas
Reason, low temperature and with the matchings of other different type absorbents in terms of, need to be furtherd investigate, in addition be helped under low temperature in wet method using light
H is integrated on the basis of desulfurization2O2One of the direction that denitrification process shows stronger application potential and this method will be studied from now on.
Chloric acid/hypochlorite oxidation's method is a kind of wet scrubbing method, and desulfurization and denitration can be realized in same complete equipment.It should
Method denitration efficiency can remove trace toxic metal up to 95% or more.Such method from the seventies in last century develop with
The exploratory development stage is constantly in, without scale application.
(2) Absorption via Chemical Complexation Absorption via Chemical Complexation is a kind of side of the simultaneous SO_2 and NO removal to grow up the 1980s
Method, the U.S., Japan and other countries research starting are more early, and this method has relatively mild process condition and paid close attention to by researcher, grinds
Study carefully and is related to complexing agent type, process condition and dynamic process.Complexing agent is mainly two class of iron-based and cobalt-based, and principle is to utilize
Fe2+、Co2+The equal formation such as transition-metal cations and ethylenediamine tetra-acetic acid (EDTA), ethylenediamine, aminotriacetic acid (NTA) complexing
Object, complex compound form π acid ligand complexes with NO again, increase the solubility of NO in water and reach removing purpose.Complexed absorption
Agent can be directly added into wet desulfurization system and realize that simultaneous SO_2 and NO removal, denitration efficiency 60%~90% can save great number and fix throwing
Money.The major obstacle of this method commercial Application is that the loss of complex compound and metal complex regeneration are difficult in reaction process, utilize
Rate is low.To improve the validity of the process, also more key scientific problems need further to explore.
Iron system and cobalt system complex compound are preferable to the complexing of NO.Although Fe (II) EDTA and ferrous cysteine are at the same time
Certain application potential is shown in terms of desulphurization denitration, but since EDTA and cysteine are expensive, to desulfurization simultaneously
Denitration brings larger cost pressure.On the other hand, it absorbs the NO to get off and needs further conversion.
So in terms of cost control, complexing agent cheap and easy to get need to be sought；In terms of process optimization, it need to realize that NO exists
Conversion is further oxidated or reduced while absorption.
The integrated iron and steel works for being provided with coke-oven plant are had a clear superiority using wet ammonia process desulfurizing technology, coking plant by-products
There are a large amount of ammonia source, sintering flue gas to be rich in elemental iron, absorption process is compounded according to ammonium hydroxide-complexing agent, it only need to be de- to desulfurization simultaneously
Nitre system supplements complex compound, forms the complexing agent for absorbing NO in absorbing liquid by the iron brought into complex compound and flue gas, simultaneously
Further conversion process to NO is set, you can realizes synchronized desulfuring and denitrifying.
Invention content
The purpose of the present invention is to solve above-mentioned technical problem, provide it is a kind of it is simple for process, operating cost is low, energy consumption
Sintering flue gas synchronized desulfuring and denitrifying technique low, control is easy, denitration effect is good, byproduct is high-quality.
Technical solution includes inversely contacting on flue gas feeding absorption tower with the circulating absorption solution sprayed from tower top spraying layer
By being discharged at the top of absorption tower after reaction；Absorbing liquid after the extension reaction of absorbing tower bottom is sent into sulphur after iron removal system removes iron
Sour ammonium byproduct recovery system, the flue gas enter absorption tower by the smoke inlet in the middle part of absorption tower, are set successively by tower top
By at the top of absorption tower after at least one layer of photochemical reaction layer, packing layer and the spraying layer and the reverse haptoreaction of circulating absorption solution set
Exhanst gas outlet discharge；The circulating absorption solution sprayed by absorption tower top spraying layer passes through packing layer, at least one layer successively
Photochemical reaction layer carries out photochemical reaction again with after the reverse haptoreaction of flue gas by the photochemical reaction layer of absorption tower lower part
It is raw, it is then sent to Photocatalytic Regeneration reaction system through pump extraction by absorb the bottom of the tower and is further regenerated, be re-fed into regeneration slurry tank,
The spraying layer for being transmitted back to absorption tower top as circulating absorption solution after filling into ammonium hydroxide and oxalic acid in regenerating slurry tank sprays into tower.
Control sprays into a concentration of 0.27~0.9mol/L of circulating absorption solution oxalate in absorption tower, iron ion+ferrous iron
Total ion concentration is：The pH value of 0.045~0.15mol/L, circulating absorption solution are 5.0~5.5.
Go out the Photocatalytic Regeneration reaction system circulating absorption solution be introduced into regeneration sedimentation basin carry out precipitation slagging-off, precipitate
Top clarified solution afterwards enters regeneration slurry tank, and lower part suspension enters iron removal system.
The concentrate into iron removal system that the absorb the bottom of the tower is drawn first is sent into concentrating and precipitating pond precipitation, concentrating and precipitating
The suspension in bottom of pond portion is sent into the Photocatalytic Regeneration reaction system, and the clarified solution of epimere is sent into iron removal system.
The photochemical reaction layer is made of the light bar of multilayer network structure, and the light bar is connect through binding post with power supply.
The voidage of the light bar of the reticular structure is 0.6-0.9.
The light bar for controlling adjacent two layers reticular structure in the photochemical reaction layer in absorption tower alternately shines.
The Photocatalytic Regeneration reaction system is the photo catalysis reactor equipped with light source.
The iron removal system is that electrolysis removes iron reactor.
The upper surface of the photochemical reaction layer of the absorption tower hypomere is concordant with bottom of tower liquid level.
After filling into ammonium hydroxide, oxalic acid and ferrous sulfate in regenerating slurry tank absorption tower top is transmitted back to as circulating absorption solution
Spraying layer spray into tower in.
The present invention adds oxalic acid in existing sintering flue gas ammonia method desulfurizing technique to circulating absorption solution, since flue gas is to burn
Flue gas is tied, contains ferro element in this kind of flue gas, when flue gas is reacted with circulating absorption solution, iron can be dissolved in circulating absorption solution,
It is demonstrated experimentally that the entrance of this part iron can meet the number of dropouts of iron in circulating absorption solution；Oxalic acid is added into circulating absorption solution
Afterwards, oxalic acid can be brought into flue gas, the iron that is dissolved in absorbing liquid generate ferric oxalate or ferrous oxalate.
Ferric oxalate can form stable ferric oxalate complexes in aqueous solution, these complex compounds are lived with good photochemistry
Property, there is more active redox characteristic under ultraviolet light.Fe therein3+It is reduced into Fe2+, oxalate urges in light
It is aoxidized under change effect and generates H2O2.The Fe that photo-reduction generates2+Again with H2O2It reacts and generates OH and Fe3+, Fe3+Meeting again
Ferric oxalate complexes are re-formed with oxalate denominationby.When there are excessive oxalate denominationby and H in solution2O2When, it will not stopping pregnancy
Raw hydroxy radical OH generates the quantum yield of OH free radicals up to 1 or so.OH free radicals are very strong oxidant, energy
Rapid oxidation, which is absorbed, to get offAnd NO.Oxalate denominationby is then constantly consumed with the progress of reaction, ultimately produces dioxy
Change carbon.Restore the Fe generated2+It is acted on oxalate and generates ferrous oxalate, ferrous oxalate has complexing to the NO in flue gas.
Inventor is exactly that can be produced under photocatalysis to the complexed absorption effect of NO and ferric oxalate using ferrous oxalate
The characteristic of raw OH free radicals, is oxidized to nitrate anion to realize final removing, while the Fe that will be aoxidized by the NO absorbed3+
It is reduced into Fe2+.Compared with Fe (II) EDTA Absorption via Chemical Complexations, the operating cost of system can be effectively reduced.
Based on above-mentioned principle, in order to improve denitration efficiency and circulating absorption solution regeneration efficiency, inventor is on absorption tower top
The lower section of original packing layer is provided with photochemical reaction layer, and illumination condition is manufactured in tower, and effect has three：A flue gases by down toward
When upper process photochemical reaction layer, chemical absorbing occurs with the circulating absorption solution for from top to bottom flowing through this layer and reacts, in flue gas
Sulfur dioxide and nitrogen oxides are absorbed, while there is also side reactions：Fe in absorbing liquid2+WithBy flue gas
In dioxygen oxidation be Fe3+WithB is provided since photochemical reaction layer has the light bar of multilayer network structure
Effective illumination condition contains in absorbing liquidUnder photocatalysis, chemically react, 2 moleculesUltimately generate the Fe of 1 molecule2+With 1 hydroxy radical OH, the hydroxy radical OH of generation, further aoxidize
In absorbing liquidAnd NO；The nitrogen oxides absorbed is aoxidized, Fe3+It is reduced, there is synchronizing regeneration effect；C is more
The light bar of layer reticular structure is similar to filling-material structure, is conducive to the uniformly distributed of circulating absorption solution and flue gas and uniformly mixes, and extends
Flue gas and circulating absorption solution gas-liquid contact time in this are conducive to the update of gas-liquid interface, circulating absorption solution and flue gas one
Side reaction regenerates on one side, removal effect is further improved, in order to ensure regeneration effect, the preferably gap of the light bar of reticular structure
Rate is 0.6-0.9, and crossing conference causes the specific surface area of gas-liquid contact too small, causes tower effect low, too small gas phase drag to be caused to increase
Add, and preferably control adjacent two layers reticular structure light bar alternately shine by way of, can make absorbing liquid shine
One floor light bar area is substantially carried out regenerative response, is then substantially carried out absorbing reaction in non-luminous floor light bar area, ensures each anti-
The efficient progress answered, the final purpose for realizing high-efficiency desulfurization denitration.Experiment shows using alternately luminous control mode than full hair
The control mode reaction efficiency higher of light, and it is more energy saving.
Further, inventor also absorption tower lower part liquid level with lower part be provided with photochemical reaction layer, pair and flue gas
Circulating absorption solution after reaction carries out further photochemical reaction regeneration, in circulating absorption solution not oxidized NO the layer into
One step is aoxidized, while part Fe3+It is reduced into Fe2+.The upper surface of photochemical reaction layer is concordant with liquid level, is conducive to cycle and inhales
The abundant regeneration of liquid is received, while can also avoid tower bottom and perturb liquid at high speed turbulence caused by pump to the impact wear of light bar.
Photocatalytic Regeneration reaction system in the present invention is photo catalysis reactor, and photo catalysis reactor is on daytime using certainly
Right light is reacted, insufficient in natural lighting condition, can be opened included light source and be carried out light-catalyzed reaction, the light
Source is the multilayer optical band of the reticular structure of arranged crosswise.Absorbing liquid after reaction is after being sent into photo catalysis reactor, in absorbing liquid
Ferric oxalate complexes issue third contact of a total solar or lunar eclipse chemical reaction in illumination condition, generate hydroxy radical OH, NO is oxidized to nitrate anion with reality
Now final removing, Fe3+It is reduced into Fe2+, Fe in solution3+Concentration reduce, Fe2+Concentration increase, realize ferrous oxalate
Regeneration.
In order to avoid the enrichment of slag in system, going out the circulating absorption solution of Photocatalytic Regeneration reaction system, to be first sent into regenerated liquid heavy
The supernatant of shallow lake pond stratification, epimere enters regeneration slurry tank, and the suspension that hypomere contains dirt mud is sent into iron removal system, to protect
The normal operation of card system.
The absorbing liquid into iron removal system that the absorb the bottom of the tower is drawn first is sent into concentrating and precipitating pond precipitation, heavy through standing
Behind shallow lake, the suspension in concentrating and precipitating bottom of pond portion is sent into the Photocatalytic Regeneration reaction system, and the clarified solution of epimere, which is sent into, removes iron system
System.The absorbing liquid precipitated and separated of iron removal system will be entered using concentrating and precipitating pond, oxalic acid iron content high suspension in bottom is sent into
Photocatalytic Regeneration reaction system regenerates, and the clarified solution of epimere is then sent into iron removal system and carries out removing iron, can both reduce in solution
The consumption of iron, and the burden of iron removal system can be mitigated, the de-ironing efficiency of concentrate is improved, the iron content in byproduct is reduced.
Regenerate slurry tank in ammonium hydroxide, oxalic acid the amount of filling into can be according to circulating absorption solution oxalate ion concentration and pH value of solution
The requirement of value is filled into, in line with damaging, the principle mended.
Advantageous effect：
(1) in sintering flue gas ammonia method desulfurizing technique, oxalic acid is added to its absorbing liquid, oxalic acid with sintering flue gas bring suction into
Receive the reaction of the iron ion in liquid generation ferrous oxalate and ferric oxalate realizes synchronized desulfuring using the complexing of ferrous oxalate
Denitration.
(2) ferrous oxalate is weaker than to the complexing of NO due to ferric oxalate, oxalic acid plays the dioxygen oxidation inhibited in flue gas
Fe2+Effect, ensure that the concentration of denitration complexing agent, improve synchronous denitration effect.
(3) using concentrating and precipitating pond to enter iron removal system absorbing liquid carry out precipitated and separated, improve iron the rate of recovery and
The utilization rate of oxalic acid reduces the burden of iron removal system, improves the quality of byproduct, is removed for circulating absorption solution using regeneration sedimentation basin
Slag ensures the normal operation of system.
(4) market of oxalic acid is of low cost is easy to get, and reduces operating cost.Oxalic acid has stronger reproducibility simultaneously, in electricity
When releasing iron, decomposition voltage is advantageously reduced, operating cost is further decreased.
Description of the drawings
Fig. 1 present invention process flow charts.
Fig. 2 is the absorption oxidation process schematic diagram of circulating absorption solution and flue gas in the presence of oxalic acid.
Fig. 3 is the regenerative response Principle of Process figure of circulating absorption solution under illumination condition.
Wherein, the absorption towers 1-, 1.1- packing layers, 1.2- spraying layers, 1.3- scrubber layers, 1.4- photochemical reactions layer, 2- be again
Raw liquid precipitate pond, 3- iron removal systems, 4- Photocatalytic Regenerations reaction system, 5- regeneration slurry tank, 6- concentrating and precipitatings pond.
Specific implementation mode
Process example：
Referring to Fig. 1, in certain sintering flue gas desulfurization system, sintering flue gas amount about 14~16Nm3/ h, SO2Concentration：500~
800mg/Nm3, NOx concentration (predominantly NO)：300~400mg/Nm3, particulate matter (wherein containing elemental iron) concentration：30~
50mg/Nm3.Desulfurization is using packed tower ammonium hydroxide absorption technique.
The physical parameter and relevant components of absorbing liquid are as follows：
PH value：5.0~5.5；
Ammonium sulfate concentrations：20~45% (mass percents)；
Fe (II)+Fe (III) total concentration：0.045~0.15mol/L；
Oxalate denominationby concentration：0.27~0.9mol/L；
Absorbing liquid temperature：50-55 DEG C.
Flue gas introduces the middle part on absorption tower 1, and in absorption tower 1, flue gas passes through at least one layer of photochemical reaction from the bottom to top
Layer 1.4 (being two layers in the present embodiment), packing layer 1.1 and spraying layer 1.2 are flowed to top of tower, last washed layer 1.3 into one
Enter after step washing outside chimney and arranges.Wherein, flue gas is entered in absorption tower 1 by 1 middle part flue gas entrance of absorption tower and is flowed up, and is risen
Flue gas chemical absorbing occurs with the circulating absorption solution that is sprayed out by spraying layer 1.2 in photochemical reaction layer 1.4 react (to react
Principle is shown in Fig. 2 and Fig. 3), sulfur dioxide and nitrogen oxides in flue gas are absorbed；Since the oxygen that flue gas carries acts on,
Simultaneously there is also ferrous oxidising at ferric iron in side reaction, that is, circulating absorption solution, by ferric iron that oxidation generates further with follow
Oxalate denominationby reaction in ring absorbing liquid generates ferric oxalate complexes Fe (C2O4)+、WithDeng.By
It is weaker to the complexing power of nitrogen oxides in ferric oxalate complexes, with the ferrous oxidising increase at ferric amount, cycle
Absorbing liquid gradually loses denitration ability.
One layer of photochemical reaction layer 1.4 of 1 lower part of absorption tower is flowed down through with the circulating absorption solution after smoke reaction
Photochemical regeneration reaction (also known as light-catalyzed reaction, reaction process principle is referring to Fig. 2) is further carried out, circulating absorption solution is improved
The upper surface of regeneration rate, the photochemical reaction layer 1.4 of 1 hypomere of the absorption tower is concordant with bottom of tower liquid level.
The photochemical reaction layer 1.4 is made of the light bar of multilayer network structure, is connect with power supply through binding post, the net
The voidage of shape structure is controlled in 0.6-0.9.Adjacent two layers in the photochemical reaction layer 1.4 on 1 top of preferred absorption tower when operation
The light bar of reticular structure alternately shines.In order to be regenerated to circulating absorption solution, ensures denitration effect, sent from what tower bottom was drawn
Enter tower top circulating absorption solution be introduced into before entering tower Photocatalytic Regeneration reaction system 4 (present invention in be the light equipped with light source
Catalytic reactor).In Photocatalytic Regeneration reaction system 4, circulating absorption solution carries out light-catalyzed reaction：
In the solution of the saturation of the air, under acid conditionWithFurther with oxygen in water O2Reaction, finally
Form H2O2。
Fe2++H2O2→Fe3+OH-+·OH (4)
2mol'sLight-catalyzed reaction consumes the oxalate denominationby of 1mol, generates the hydroxy radical of 1mol
OH, the NO that oxidative absorption gets off, while generating the Fe of 1mol2+, realize the regeneration of absorbing liquid.
Circulating absorption solution after being regenerated by Photocatalytic Regeneration reaction system 4 is introduced into regenerated liquid sedimentation basin 2 and stands 30-40
Hour, the clarified solution on top enters regeneration slurry tank 5, and the suspension that dirt mud is contained in lower part is sent into iron removal system 3.
Circulating absorption solution after regeneration enters regeneration slurry tank 5, is required to regeneration according to the physical index of circulating absorption solution
The ammonium hydroxide and oxalic acid of supplement loss in slurry tank 5, then be pumped into the penetrating tower of spraying layer 1.2 on 1 top of absorption tower by cycle.
2-3L slurries are drawn from 1 bottom of absorption tower enter concentrating and precipitating pond 6 per hour, sedimentation time 30-40 hour, on
Clear liquid enters iron removal system 3, and (i.e. electrolysis removes iron reactor, if number of patent application is 201520886784.2, entitled " one
Kind of oriented flow electrolysis unit ", or it is other using electrolysis except iron is the electrolysis reactor of principle), lower layer's oxalic acid iron content compared with
High suspension is sent into the further regeneration of Photocatalytic Regeneration reaction system 4.Treated the slurries of iron removal system 3 are sent into ammonium sulfate pair
Product Collection System further removes impurity production ammonium sulfate byproduct.
When going into operation, ferrous sulfate can be first filled into circulating absorption solution, after system operation for a period of time after, due to sintering
The elemental iron that flue gas is brought into is dissolved in absorbing liquid and is constantly enriched with, it is sufficient to which supplement, which is drawn, enters ammonium sulfate byproduct recovery system
The iron component taken out of of circulating absorption solution, can stop filling into ferrous sulfate at this time, according only to the ammonium hydroxide for needing to fill into loss and
Oxalic acid.
Claims (8)
1. a kind of sintering flue gas synchronized desulfuring and denitrifying technique includes that flue gas is sent into absorption tower and is sprayed from tower top spraying layer
By being discharged at the top of absorption tower after the reverse haptoreaction of circulating absorption solution；Absorbing liquid after the extension reaction of absorbing tower bottom is through removing
Iron system is sent into ammonium sulfate crystallization system after removing iron, which is characterized in that the flue gas is entered by the smoke inlet in the middle part of absorption tower
Absorption tower, at least one layer of photochemical reaction layer, packing layer and spraying layer and the circulating absorption solution for passing through the setting of tower top successively are inverse
It is discharged by the exhanst gas outlet at the top of absorption tower after to haptoreaction；The circulating absorption solution sprayed by absorption tower top spraying layer
Successively after packing layer, at least one layer of photochemical reaction layer and the reverse haptoreaction of flue gas, by the photochemical of absorption tower lower part
It learns conversion zone and carries out photochemical reaction regeneration, then drawn and sent to Photocatalytic Regeneration reaction system into one through pump by absorb the bottom of the tower
Step regeneration, is re-fed into regeneration slurry tank, suction is transmitted back to as circulating absorption solution after filling into ammonium hydroxide and oxalic acid in regenerating slurry tank
The spraying layer for receiving tower top sprays into tower；The photochemical reaction layer is made of the light bar of multilayer network structure, the light bar warp
Binding post is connect with power supply, and the light bar for controlling adjacent two layers reticular structure in the photochemical reaction layer in absorption tower alternately shines.
2. a kind of sintering flue gas synchronized desulfuring and denitrifying technique as described in claim 1, which is characterized in that control sprays into absorption tower
Interior a concentration of 0.27~0.9mol/L of circulating absorption solution oxalate, iron ion+ferrous ion total concentration are：0.045~
The pH value of 0.15mol/L, circulating absorption solution are 5.0~5.5.
3. a kind of sintering flue gas synchronized desulfuring and denitrifying technique as claimed in claim 1 or 2, which is characterized in that go out the light and urge
The circulating absorption solution of change regenerative response system is introduced into regeneration sedimentation basin and carries out precipitation slagging-off, and the top clarified solution after precipitation enters
Slurry tank is regenerated, lower part suspension enters iron removal system.
4. a kind of sintering flue gas synchronized desulfuring and denitrifying technique as described in claim 1, which is characterized in that the absorb the bottom of the tower
The absorbing liquid into iron removal system of extraction is first sent into concentrating and precipitating pond and is precipitated, described in the suspension feeding in concentrating and precipitating bottom of pond portion
The clarified solution of Photocatalytic Regeneration reaction system, epimere is sent into iron removal system.
5. a kind of sintering flue gas synchronized desulfuring and denitrifying technique as described in claim 1, which is characterized in that the reticular structure
The voidage of light bar is 0.6-0.9.
6. a kind of sintering flue gas synchronized desulfuring and denitrifying technique as described in claim 1 or 4, which is characterized in that the photocatalysis
Regenerative response system is the photo catalysis reactor equipped with light source.
7. a kind of sintering flue gas synchronized desulfuring and denitrifying technique as described in claim 1, which is characterized in that the iron removal system is
Electrolysis removes iron reactor.
8. a kind of sintering flue gas synchronized desulfuring and denitrifying technique as described in claim 1, which is characterized in that the absorption tower hypomere
Photochemical reaction layer upper surface it is concordant with bottom of tower liquid level.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610255064.5A CN105854558B (en) | 2016-04-22 | 2016-04-22 | A kind of sintering flue gas synchronized desulfuring and denitrifying technique |
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| CN201610255064.5A CN105854558B (en) | 2016-04-22 | 2016-04-22 | A kind of sintering flue gas synchronized desulfuring and denitrifying technique |
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| CN105854558A CN105854558A (en) | 2016-08-17 |
| CN105854558B true CN105854558B (en) | 2018-08-28 |
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