CN105854558A - Sintering flue gas simultaneous desulfurization and denitration process - Google Patents
Sintering flue gas simultaneous desulfurization and denitration process Download PDFInfo
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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
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- 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
- B01D53/60—Simultaneously removing sulfur oxides and 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
- B01D53/96—Regeneration, reactivation or recycling of reactants
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- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2062—Ammonia
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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Abstract
The invention relates to a sintering flue gas simultaneous desulfurization and denitration process, which comprises the following steps that flue gas is conveyed into an absorption tower and is then exhausted from the top of the absorption tower after reverse contact reaction with circulation absorption liquid sprayed out from a spraying layer at the upper part of the tower; the flue gas enters the absorption tower from a flue gas inlet formed in the middle part of the absorption tower, performs reverse contact reaction with the circulation absorption liquid after sequentially passing through at least one photochemical reaction layer, a filling layer and a spraying layer which are arranged at the upper part of the tower, and is then exhausted from a flue gas outlet formed in the top of the absorption tower; the circulation absorption liquid sprayed out from the spraying layer arranged at the upper part of the absorption tower sequentially passes through the filling layer and the at least one photochemical reaction layer to take a reverse contact reaction with the flue gas, performs photochemical reaction for regeneration after passing through the photochemical reaction layer arranged at the lower part of the absorption tower, and is then conveyed to a photocatalysis regeneration reaction system for regeneration from the bottom of the absorption tower; ammonia water and oxalic acid are supplemented in a regeneration serous fluid tank; the circulation absorption liquid is conveyed back to the spraying layer arranged at the upper part of the absorption tower to be sprayed into the tower. The sintering flue gas simultaneous desulfurization and denitration process has the advantages that the process is simple; the operation cost is low; the energy consumption is low; the control is simple and convenient; the denitration effect is good; the by-product quality is good.
Description
Technical field
The present invention relates to the flue gas ammonia process synchronized desulfuring and denitrifying technique of a kind of field of Environment Protection, concrete
Say it is a kind of sintering flue gas synchronized desulfuring and denitrifying technique.
Background technology
Wet method simultaneous SO_2 and NO removal technology is the focus of sintering smoke gas treatment area research, mainly has
Oxidative absorption method and Absorption via Chemical Complexation two class.
(1) oxidizing process is that NO is oxidized to NO2After, realize same in wet desulphurisation system
Time denitration.NO in NOx2There is preferable water solublity, but in flue gas, the NOx of more than 90% is
NO, water solublity is extremely low, in order to improve denitration effect, NO need to be oxidized to NO2, then wet
Formula desulphurization system realizes denitration simultaneously.Oxidizing process point 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、H2O2
It it is the oxidant of most study.Gas phase oxidation process condition is harsher, and oxidation rate is slow, and gas
Body has corrosivity and toxicity more, and running risk is bigger；The laboratory of liquid-phase oxidation process
Research show that there is preferable effect, can with alkali liquor absorption process synergic, but solution circulation and inhale
Receive liquid after-treatment system more complicated.
H2O2Denitration is the focus in oxidizing process, and its denitration technology route has three kinds: 1. to height
Temperature flue sprays into H2O2, utilize flue high temperature to excite generation OH and HO2Deng free radical,
Realize NO oxidation, belong to gaseous oxidation；2. H is excited by UV2O2Produce free radical and NOx
Reaction, it is possible to decrease reaction temperature；3. use wet method mode to absorb at spray column internal oxidition, reach
Purpose to removing NOx.This technology belongs to high-level oxidation technology, is in laboratory both at home and abroad
Stage.The method for actual fume treatment, low temperature and with other dissimilar absorbent
Formula face, need further investigation, additionally uses light to help under low temperature and collects on the basis of wet desulphurization
Become H2O2Denitrification process shows stronger application potential, is also the side studied from now on of the method
One of to.
Chloric acid/hypochlorite oxidation's method is a kind of wet scrubbing method, can be real in same set of equipment
Existing desulfurization and denitration.The method denitration efficiency is reaching more than 95%, can remove trace toxic simultaneously
Metal.This type of method has been constantly in the exploratory development stage since the seventies in last century develops,
Scale is not had to apply.
(2) Absorption via Chemical Complexation Absorption via Chemical Complexation is the one grown up the eighties in 20th century
The method of simultaneous SO_2 and NO removal, relatively early, the method has for the U.S., Japan and other countries research starting
Relatively mild process condition and paid close attention to by researcher, research relate to chelating agent kind, process bar
Part and dynamic process.Chelating agent is mainly iron-based and cobalt-based two class, and its principle is to utilize Fe2+、
Co2+Deng transition-metal cation and ethylenediaminetetraacetic acid (EDTA), ethylenediamine, amino three
Acetic acid (NTA) etc. form complex, and complex forms π-acid ligand complexe with NO again,
Increase NO dissolubility in water to reach to remove purpose.Complexes absorption can be directly added into wet method
Desulphurization system realizes simultaneous SO_2 and NO removal, denitration efficiency 60%～90%, can save great number and fix
Investment.The major obstacle of the method commercial Application is loss and the metal of complex in course of reaction
Complex regeneration difficulty, utilization rate are low.For improving the effectiveness of this process, the most more key
Problem in science needs to explore further.
Ferrum system and cobalt system complex are preferable to the complexing of NO.Although Fe (II) EDTA and half
The ferrous desulphurization denitration aspect at the same time of cystine all shows certain application potential, but due to
EDTA and cysteine are expensive, bring bigger cost pressure to simultaneous SO_2 and NO removal.
On the other hand, the NO absorbed needs further to convert.
So, in terms of cost control, chelating agent cheap and easy to get need to be sought；At process optimization
Aspect, need to realize NO and be oxidated or reduced conversion further while absorbing.
The integrated iron and steel works being provided with coke-oven plant use wet ammonia process desulfurizing technology to have the most excellent
Gesture, coke-oven plant's by-product has substantial amounts of ammonia source, and sintering flue gas is rich in elemental iron, according to ammonia
-chelating agent compounds absorption process, only need to supplement complex to simultaneous SO_2 and NO removal system, pass through network
The ferrum brought in compound and flue gas forms the chelating agent absorbing NO in absorbing liquid, arranges simultaneously
Further conversion process to NO, can realize synchronized desulfuring and denitrifying.
Summary of the invention
The invention aims to solve above-mentioned technical problem, it is provided that a kind of technique is simple, fortune
Row low cost, energy consumption are low, control is easy, denitration effect is good, side-product matter measured sintering cigarette
Gas synchronized desulfuring and denitrifying technique.
Technical scheme includes flue gas is sent into absorption tower and the circulation from the ejection of tower top spraying layer
Discharged by top, absorption tower after the reverse haptoreaction of absorbing liquid；Extension reaction at the bottom of absorbing tower
After absorbing liquid through iron removal system except sending into ammonium sulfate side-product recovery system, described flue gas after ferrum
Entered absorption tower by the smoke inlet in the middle part of absorption tower, sequentially pass through at least the one of the setting of tower top
By inhaling after layer photochemical reaction layer, packing layer and spraying layer haptoreaction reverse with circulating absorption solution
The exhanst gas outlet receiving top of tower is discharged；Described by the cyclic absorption of top, absorption tower spraying layer ejection
After liquid sequentially passes through packing layer, at least one of which photochemical reaction layer and the reverse haptoreaction of flue gas,
Photochemical reaction layer through bottom, absorption tower carries out photochemical reaction regeneration, then by absorption tower
Bottom is delivered to Photocatalytic Regeneration response system through pump extraction and is regenerated further, is re-fed into regenerating serosity
Groove, as circulating absorption solution is transmitted back to absorption tower after filling into ammonia and oxalic acid in recycled pulp liquid bath
The spraying layer on top sprays in tower.
Control spray into the circulating absorption solution oxalate concentration in absorption tower be 0.27～
0.9mol/L, iron ion+ferrous ion total concentration is: 0.045～0.15mol/L, and circulation is inhaled
The pH value receiving liquid is 5.0～5.5.
Go out the circulating absorption solution of described Photocatalytic Regeneration response system to be introduced into regeneration sedimentation tank and enter
Row precipitation slagging-off, the top clear liquor after precipitation enters recycled pulp liquid bath, and bottom suspension enters
Iron removal system.
The concentrated solution entering iron removal system drawn bottom described absorption tower first sends into concentrating and precipitating
Pond is precipitated, and the suspension bottom concentrating and precipitating pond sends into described Photocatalytic Regeneration response system, on
Iron removal system sent into by the clear liquor of section.
Described photochemical reaction layer is made up of the cancellated light bar of multilamellar, and described light bar is through wiring
Post is connected with power supply.
The voidage of described cancellated light bar is 0.6-0.9.
Control the cancellated light bar of adjacent two layers in the photochemical reaction layer in absorption tower to replace
Luminous.
Described Photocatalytic Regeneration response system is the photo catalysis reactor being provided with light source.
Described iron removal system removes iron reactor for electrolysis.
The upper surface of the photochemical reaction layer of described absorption tower hypomere is concordant with tower bottom liquid face.
Return as circulating absorption solution after filling into ammonia, oxalic acid and ferrous sulfate in recycled pulp liquid bath
The spraying layer delivering to top, absorption tower sprays in tower.
The present invention adds grass to circulating absorption solution in existing sintering flue gas ammonia method desulfurizing technique
Acid, owing to flue gas is sintering flue gas, containing ferrum element in this kind of flue gas, when flue gas is inhaled with circulation
When receiving liquid reaction, ferrum can be dissolved in circulating absorption solution, it is demonstrated experimentally that the entrance of this part ferrum
The number of dropouts of ferrum in circulating absorption solution can be met；After adding oxalic acid in circulating absorption solution, grass
Ferrum that acid can be brought into flue gas, that be dissolved in absorbing liquid generates ferric oxalate or Ferrox..
Ferric oxalate can form stable ferric oxalate complexes in aqueous, and these complex have
Well photochemical activity, has relatively active redox characteristic under ultraviolet light irradiates.Its
In Fe3+It is reduced into Fe2+, oxalate is oxidized and generate H under photocatalysis2O2。
The Fe that photo-reduction generates2+Again with H2O2React generation OH and Fe3+, Fe3+Again can be with grass
Acid ion re-forms ferric oxalate complexes.When solution exists excess oxalate denominationby and
H2O2Time, will constantly produce hydroxy radical OH, produce the quantum yield of OH free radical up to
About 1.OH free radical is the strongest oxidant, can be absorbed by rapid oxidation
And NO.Oxalate denominationby is then constantly consumed with the carrying out of reaction, ultimately produces carbon dioxide.
The Fe that reduction generates2+Generating Ferrox. with oxalate effect, Ferrox. is to the NO in flue gas
There is complexing.
Inventor utilizes Ferrox. to urge complexed absorption effect and the ferric oxalate of NO at light just
Can produce the characteristic of OH free radical under change effect, NO absorption got off is oxidized to nitrate anion
To realize final removing, simultaneously by oxidized Fe3+It is reduced into Fe2+.With Fe (II) EDTA
Absorption via Chemical Complexation is compared, and can effectively reduce the operating cost of system.
Based on above-mentioned principle, in order to improve denitration efficiency and circulating absorption solution regeneration efficiency, invention
People is provided with photochemical reaction layer in the lower section of the original packing layer in top, absorption tower, manufactures in tower
Illumination condition, its effect has three: a flue gas from the bottom to top through photochemical reaction layer, with by
Flow through down the circulating absorption solution generation chemical absorbing reaction of this layer, the sulfur dioxide in flue gas
Absorbed with nitrogen oxides, be there is also side reaction simultaneously: the Fe in absorbing liquid2+WithIt is Fe by the dioxygen oxidation in flue gas3+WithB, owing to photochemistry is anti-
Answer layer to have the cancellated light bar of multilamellar, it is provided that effective illumination condition, absorbing liquid contains
HaveUnder photocatalysis, there is chemical reaction, 2 molecules
Ultimately generate the Fe of 1 molecule2+With 1 hydroxy radical OH, the hydroxy radical OH of generation,
Further in oxidative absorption liquidAnd NO；The nitrogen oxides absorbed is oxidized, Fe3+
It is reduced, there is synchronizing regeneration effect；C, the cancellated light bar of multilamellar is similar to filler knot
Structure, beneficially circulating absorption solution and flue gas uniform and uniform mix, and extend flue gas and follow
Ring absorbing liquid gas-liquid contact time in this, the beneficially renewal of gas-liquid interface, circulating absorption solution
Reacting with flue gas while regenerating, further increasing removal effect, in order to ensure revival
Really, the voidage of the most cancellated light bar is 0.6-0.9, crosses conference and causes gas-liquid to connect
The specific surface area touched is too small, causes tower effect low, and too small meeting causes gas phase drag to increase, and excellent
Gated and controlled the mode that the cancellated light bar of adjacent two layers is the most luminous, absorbing liquid can be made
It is substantially carried out regenerative response, then in a non-luminous floor light bar district in a luminous floor light bar district
It is substantially carried out absorbing reaction, it is ensured that efficiently carrying out of each reaction, finally realizes high-efficiency desulfurization denitration
Purpose.Experiment shows, uses the most luminous control mode more anti-than full-luminous control mode
Should be in hgher efficiency, and the most energy-conservation.
Further, inventor to be also provided with photochemistry at bottom, absorption tower liquid level with lower part anti-
Answer layer, to smoke reaction after circulating absorption solution carry out further photochemical reaction regeneration,
NO not oxidized in circulating absorption solution is the most oxidized at this layer, simultaneously part Fe3+Also
Former one-tenth Fe2+.The upper surface of photochemical reaction layer is concordant with liquid level, beneficially circulating absorption solution
Fully regeneration, the most also can avoid tower bottom and perturb liquid at high speed turbulence that pump causes to light bar
Impact wear.
Photocatalytic Regeneration response system in the present invention is photo catalysis reactor, photo catalysis reactor
May utilize nature light by day to react, in the case of natural lighting condition deficiency, can open
Opening the light source carried and carry out light-catalyzed reaction, described light source is the cancellated many of arranged crosswise
Layer light belt.Reacted absorbing liquid is being sent into after photo catalysis reactor, absorbing liquid mesoxalic acid ferrum network
Compound issues third contact of a total solar or lunar eclipse chemical reaction at illumination condition, produces hydroxy radical OH, is aoxidized by NO
Become nitrate anion to realize final removing, Fe3+It is reduced into Fe2+, Fe in solution3+Concentration fall
Low, Fe2+Concentration raise, it is achieved that the regeneration of Ferrox..
In order to avoid the enrichment of slag in system, go out the circulating absorption solution of Photocatalytic Regeneration response system
First sending into regenerated liquid sedimentation tank stratification, the supernatant of epimere enters recycled pulp liquid bath, hypomere
Suspension containing dirt mud sends into iron removal system, to ensure the properly functioning of system.
The absorbing liquid entering iron removal system drawn bottom described absorption tower first sends into concentrating and precipitating
Pond is precipitated, and after staticly settling, the suspension bottom concentrating and precipitating pond sends into described photocatalysis again
Raw response system, iron removal system sent into by the clear liquor of epimere.Concentrating and precipitating pond is used entrance to be removed
The absorbing liquid precipitated and separated of ferrum system, the suspension that bottom ferric oxalate content is high sends into photocatalysis again
Raw response system regeneration, then sends into the clear liquor of epimere iron removal system and carries out, except ferrum, both may be used
Reduce the consumption of ferrum in solution, the burden of iron removal system can be alleviated again, improve concentrated solution except ferrum
Efficiency, reduces the iron content in side-product.
Ammonia in recycled pulp liquid bath, oxalic acid the amount of filling into can according to circulating absorption solution oxalate from
The requirement of sub-concentration and solution ph fills into, in line with damaging, and the principle mended.
Beneficial effect:
(1) in sintering flue gas ammonia method desulfurizing technique, oxalic acid, oxalic acid are added to its absorbing liquid
Generation Ferrox. and ferric oxalate, profit is reacted with bringing the iron ion in absorbing liquid into sintering flue gas
By the complexing of Ferrox., it is achieved that synchronized desulfuring and denitrifying.
(2) due to ferric oxalate, the complexing of NO being weaker than Ferrox., oxalic acid plays suppression
Dioxygen oxidation Fe in flue gas2+Effect, it is ensured that the concentration of denitration chelating agent, improve with
Step denitration effect.
(3) utilize concentrating and precipitating pond that the absorbing liquid entering iron removal system is carried out precipitated and separated,
Improve the response rate and the utilization rate of oxalic acid of ferrum, reduce the burden of iron removal system, improve side-product
Quality, utilizing regeneration sedimentation tank is circulating absorption solution slagging-off, it is ensured that system properly functioning.
(4) market of oxalic acid is with low cost is easy to get, and reduces operating cost.Oxalic acid has simultaneously
Stronger reproducibility, when electrolysis is except ferrum, advantageously reduces decomposition voltage, reduces fortune further
Row cost.
Accompanying drawing explanation
Fig. 1 present invention process flow chart.
Fig. 2 is circulating absorption solution and the absorption oxidizing process schematic diagram of 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, 1-absorption tower, 1.1-packing layer, 1.2-spraying layer, 1.3-scrubber layer, 1.4-
The reaction of photochemical reaction layer, 2-regenerated liquid sedimentation tank, 3-iron removal system, 4-Photocatalytic Regeneration is
System, 5-recycled pulp liquid bath, 6-concentrating and precipitating pond.
Detailed description of the invention
Process example:
See Fig. 1, in certain sintering flue gas desulfurization system, sinter exhaust gas volumn 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 uses filler
Tower ammonia absorption technique.
Physical parameter and the relevant components of absorbing liquid are as follows:
PH value: 5.0～5.5；
Ammonium sulfate concentrations: 20～45% (mass percent)；
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 is from the bottom to top through extremely
Few one layer of photochemical reaction layer 1.4 (being two-layer in the present embodiment), packing layer 1.1 and spray
Layer 1.2 flows to top of tower, and last scrubbed layer 1.3 enters after washing further and arranges outside chimney.
Wherein, flue gas flows up in being entered absorption tower 1 by smoke inlet in the middle part of absorption tower 1, rises
Flue gas send out with the circulating absorption solution sprayed out by spraying layer 1.2 in photochemical reaction layer 1.4
Biochemical absorption reacts (reaction principle is shown in Fig. 2 and Fig. 3), the sulfur dioxide in flue gas and nitrogen
Oxide is absorbed；The oxygen effect carried due to flue gas, there is also side reaction i.e. simultaneously
Ferrous oxidising one-tenth ferric iron in circulating absorption solution, the ferric iron of oxidized generation further with follow
Oxalate denominationby reaction in ring absorbing liquid generates ferric oxalate complexes Fe (C2O4)+、
WithDeng.Owing to ferric oxalate complexes is more weak to the complexing power of nitrogen oxides, along with
The increase of the ferric amount of ferrous oxidising one-tenth, circulating absorption solution gradually loses denitration ability.
With a layer that the circulating absorption solution after smoke reaction flows down through bottom, absorption tower 1
Photochemical reaction layer 1.4 carries out photochemical regeneration reaction further (also known as light-catalyzed reaction, instead
Principle of Process is answered to see Fig. 2), improve the regeneration rate of circulating absorption solution, 1 time, described absorption tower
The upper surface of the photochemical reaction layer 1.4 of section is concordant with tower bottom liquid face.
Described photochemical reaction layer 1.4 is made up of the cancellated light bar of multilamellar, through binding post with
Power supply connects, and described cancellated voidage controls at 0.6-0.9.Preferably inhale during operation
Receive the cancellated light bar of adjacent two layers in the photochemical reaction layer 1.4 on tower 1 top alternately to send out
Light.In order to circulating absorption solution is regenerated, it is ensured that denitration effect, from sending that tower bottom is drawn
The circulating absorption solution entering tower top is introduced into Photocatalytic Regeneration response system 4 (this before entering tower
It is the photo catalysis reactor being provided with light source in bright).In Photocatalytic Regeneration response system 4, follow
Ring absorbing liquid carries out light-catalyzed reaction:
In the solution of the saturation of the air, under acid conditionWithMolten with water further
Solve oxygen O2Reaction, ultimately forms H2O2。
Fe2++H2O2→Fe3+OH-+·OH (4)
2mol'sLight-catalyzed reaction, consumes the oxalate denominationby of 1mol, generates 1mol
Hydroxy radical OH, the NO that oxidative absorption gets off, generate the Fe of 1mol simultaneously2+, it is achieved
The regeneration of absorbing liquid.
Circulating absorption solution after being regenerated by Photocatalytic Regeneration response system 4 is introduced into regenerated liquid and sinks
Pond, shallow lake 2 stands 30-40 hour, and the clear liquor on top enters recycled pulp liquid bath 5, and bottom contains
The suspension having dirt mud sends into iron removal system 3.
Circulating absorption solution after regeneration enters recycled pulp liquid bath 5, according to the physical property of circulating absorption solution
Index request supplements ammonia and the oxalic acid of loss in recycled pulp liquid bath 5, then is sent into by circulating pump
The spraying layer 1.2 on top, absorption tower 1 sprays in tower.
Bottom absorption tower 1, draw 2-3L serosity per hour enter concentrating and precipitating pond 6, precipitation
30-40 hour time, supernatant enter iron removal system 3 (i.e. electrolysis except iron reactor, as
Number of patent application is 201520886784.2, invention entitled " a kind of oriented flow electrolysis unit ",
Can also be that other removes the ferrum electrolysis reactor as principle with electrolysis), lower floor's ferric oxalate content is relatively
High suspension is sent into Photocatalytic Regeneration response system 4 and is regenerated further.Iron removal system 3 processes
After serosity send into ammonium sulfate side-product recovery system to go the removal of impurity to produce ammonium sulfate further secondary
Product.
When going into operation, first can fill into ferrous sulfate in circulating absorption solution, when system runs one section
After between, owing to the elemental iron brought into sintering flue gas is dissolved in absorbing liquid and is constantly enriched with, foot
The ferrum group that the circulating absorption solution of ammonium sulfate side-product recovery system is taken out of is entered with supplementary extraction
Point, now can stop filling into ferrous sulfate, according only to needing to fill into the ammonia of loss and oxalic acid i.e.
Can.
Claims (10)
1. sintering a flue gas synchronized desulfuring and denitrifying technique, including flue gas is sent into absorption tower with
Arranged by top, absorption tower after the reverse haptoreaction of circulating absorption solution of tower top spraying layer ejection
Go out；The reacted absorbing liquid of extension at the bottom of absorbing tower sends into sulphuric acid after iron removal system is except ferrum
Crystalline ammonium system, it is characterised in that described flue gas is entered by the smoke inlet in the middle part of absorption tower to be inhaled
Receive tower, sequentially pass through at least one of which photochemical reaction layer, packing layer and spray that tower top is arranged
Discharged by the exhanst gas outlet at top, absorption tower after layer haptoreaction reverse with circulating absorption solution；Described
Packing layer, at least one of which light is sequentially passed through by the circulating absorption solution of top, absorption tower spraying layer ejection
After chemically reactive layer and the reverse haptoreaction of flue gas, through the photochemical reaction layer of bottom, absorption tower
Carry out photochemical reaction regeneration, then anti-by delivering to Photocatalytic Regeneration through pump extraction bottom absorption tower
Answer system to regenerate further, be re-fed into recycled pulp liquid bath, fill in recycled pulp liquid bath ammonia and
It is transmitted back to the spraying layer on top, absorption tower as circulating absorption solution after oxalic acid spray in tower.
2. a kind of sintering flue gas synchronized desulfuring and denitrifying technique as claimed in claim 1, it is special
Levy and be, control spray into the circulating absorption solution oxalate concentration in absorption tower be 0.27～
0.9mol/L, iron ion+ferrous ion total concentration is: 0.045～0.15mol/L, and circulation is inhaled
The pH value receiving liquid is 5.0～5.5.
3. a kind of sintering flue gas synchronized desulfuring and denitrifying technique as claimed in claim 1 or 2,
It is characterized in that, going out the circulating absorption solution of described Photocatalytic Regeneration response system, to be introduced into regeneration heavy
Pond, shallow lake carries out precipitation slagging-off, and the top clear liquor after precipitation enters recycled pulp liquid bath, and bottom is suspended
Liquid enters iron removal system.
4. a kind of sintering flue gas synchronized desulfuring and denitrifying technique as claimed in claim 1, it is special
Levying and be, it is heavy that the absorbing liquid entering iron removal system drawn bottom described absorption tower first sends into concentration
Pond, shallow lake is precipitated, and the suspension bottom concentrating and precipitating pond sends into described Photocatalytic Regeneration response system,
Iron removal system sent into by the clear liquor of epimere.
5. a kind of sintering flue gas synchronized desulfuring and denitrifying technique as claimed in claim 1 or 2,
It is characterized in that, described photochemical reaction layer is made up of the cancellated light bar of multilamellar, described lamp
Band is connected with power supply through binding post.
6. a kind of sintering flue gas synchronized desulfuring and denitrifying technique as claimed in claim 5, it is special
Levying and be, the voidage of described cancellated light bar is 0.6-0.9.
7. a kind of sintering flue gas synchronized desulfuring and denitrifying technique as described in claim 5 or 6,
It is characterized in that, control the cancellated lamp of adjacent two layers in the photochemical reaction layer in absorption tower
Tape alternation is luminous.
8. a kind of sintering flue gas synchronized desulfuring and denitrifying work as described in claim 1 or 3 or 4
Skill, it is characterised in that described Photocatalytic Regeneration response system is the light-catalyzed reaction being provided with light source
Device.
9. a kind of sintering flue gas synchronized desulfuring and denitrifying technique as claimed in claim 1, it is special
Levying and be, described iron removal system removes iron reactor for electrolysis.
10. a kind of sintering flue gas synchronized desulfuring and denitrifying technique as claimed in claim 1, it is special
Levying and be, the upper surface of the photochemical reaction layer of described absorption tower hypomere is concordant with tower bottom liquid face.
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| CN107398165A (en) * | 2017-08-10 | 2017-11-28 | 上海博丹环境工程技术股份有限公司 | A kind of desulfurizing and denitrifying process of boiler smoke |
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