CN105833725A - Synchronous denitration complexing agent regeneration process based on flue gas ammonia-process desulfurization - Google Patents
Synchronous denitration complexing agent regeneration process based on flue gas ammonia-process desulfurization 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
- B01D53/96—Regeneration, reactivation or recycling of reactants
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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
- B01D53/60—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
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
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- B01D53/78—Liquid phase processes with gas-liquid contact
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Abstract
The invention discloses a synchronous denitration complexing agent regeneration process based on flue gas ammonia-process desulfurization. The synchronous denitration complexing agent regeneration process comprises the following steps: feeding supercharged flue gas into a concentration tower to carry out contact reaction on the supercharged flue gas and a concentrated solution in the tower; feeding flue gas discharged from the concentration tower into an adsorption tower, wherein the flue gas enters the absorption tower from a flue gas inlet in the middle part of the adsorption tower, and is discharged from a flue gas outlet after sequentially passing through at least one photochemical reaction layer, a filler layer and a spray layer on the upper part of the tower to have reverse contact reaction with a circulating absorption liquid; enabling the circulating absorption liquid sprayed out from the spray layer on the upper part of the absorption tower to enter the bottom of the absorption tower after sequentially passing through the filler layer and the photochemical reaction layer to have reverse contact reaction with the flue gas, and feeding into a photocatalytic regeneration reaction system from a circulating pump for regeneration, and then entering a regenerated slurry slot; supplementing ammonia water, a complexing agent, oxalic acid and ferrous sulfate into the regenerated slurry slot as a circulating absorption liquid, and feeding back into the spray layer on the upper part of the absorption tower to be sprayed into the tower. The synchronous denitration complexing agent regeneration process is simple in process, is low in operation cost, is low in energy consumption, is simple and convenient to control, is good in denitration effect and is good in byproduct quality.
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 synchronization denitration chelating agent regeneration technology based on flue gas ammonia method desulfurizing.
Background technology
China's flue gas desulfurization and denitrification technology is started late, but be as tightened up environmental practice
Putting into effect, flue gas desulfurization and denitrification is the most imperative.The Ministry of Science and Technology is by flue gas and desulfurizing and denitrifying
" 863 " Major Research Plan has been listed in technological development in.In recent years, China was to desulphurization denitration one
The research of change technology is more active, although most new technology is also in development in laboratory and pilot scale rank
Section, but some technical matters have obtained bigger improvement.Simultaneous SO_2 and NO removal technology can be
Realize desulfurization and denitration in same set of system, have the following characteristics that 1. equipment is simplified, take up an area face
Long-pending little.Traditional associating flue gas desulfurization and denitration technique is usually and installs denitration dress before cleaner unit additional
Put such as SCR (SCR) or SNCR (SNCR), thus realize connection
Close desulphurization denitration.This classification administration way not only equipment is many, and floor space is big, is not so good as
The equipment simultaneously realizing desulfurization and denitration in same set of system is simplified.2. capital expenditure is few, raw
Produce low cost.Flue gas and desulfurizing and denitrifying technology can realize desulfurization with de-in same set of system
Nitre, needs a large amount of capital expenditure unlike traditional handicraft, reduces production run cost.③
Automaticity is high, convenient management.Owing to realizing the integration of desulphurization denitration in same set of system,
Bring conveniently to equipment control.For adapting to the demand of present and following Air Pollution Control, open
Send out simultaneous SO_2 and NO removal new technique, new equipment and be increasingly becoming the development side in Air Pollution Control field
One of to.
Traditional Wet Flue Gas Desulfurization Technique can remove SO: reaches more than 90%, then with SCR dry type work
Skill is combined, and two kinds of techniques, because using different technologies to work alone, exist that scale of investment is big, cost
High problem.Some metal complexs are found that as far back as Sada in 1986 and partner, as
Fe (II) EDTA etc. can react rapidly with NO, can promote the absorption of nitride.These are wet type
The design of FGD+ metal complex technique has prepared condition.Wet type FGD+ metal complex technique
It is addition ferrous ion in nonacidic solutions, forms the amino hydroxy acid ferrous iron chelas such as Fe (II) EDTA
Compound.NO can in combination become ferrous nitrosyl complex, thus accelerate the absorption speed of NO
Rate, the most ferrous nitrosyl complex can be with the SO of dissolving in solution2Reaction generates N2, one be
Row N, S compound etc..But Fe (II) EDTA cleaning mixture can gradually inactivate, and causes absorbing liquid
Regeneration complexity, this technique is also in experimental stage.To this, some researcheres pass through experiment discussion
NO and SO in renewable ferrous cysteine Solution for Simultaneous Removal gas2, find 20min
Time removal efficiency be respectively 82.3% and 94.4%.Ferrous cysteine complexometry can not only remove
NO and SO2, and cystine can be reduced into cysteine and make reaction be able to circulation to carry out, table
Reveal certain application potential.
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.
So, seek the highly efficient regeneration of chelating agent, the conversion of NO in the liquid phase, release chelating agent,
It is the key realizing simultaneous SO_2 and NO removal that the circulation of effective process is stablized in foundation.
Summary of the invention
The present invention provides that a kind of technique is simple, operating cost is low, energy consumption is low, controls is easy, takes off
Nitre is effective, the measured a kind of synchronization denitration chelating agent based on flue gas ammonia method desulfurizing of side-product matter
Regeneration technology, solves the problems such as regeneration efficiency is low present in prior art.
Technical scheme sends into concentration tower and concentrated solution haptoreaction in tower after including flue gas supercharging, go out
It is reverse with the circulating absorption solution sprayed from tower top spraying layer that the flue gas of concentration tower sends into absorption tower
Discharged by top, absorption tower after haptoreaction；Concentration after the partial reaction drawn at the bottom of concentration tower tower
Liquid through iron removal system except sending into ammonium sulfate crystallization system after ferrum, described flue gas by absorption tower in the middle part of
Smoke inlet enters absorption tower, sequentially passes through at least one of which photochemical reaction that tower top is arranged
Discharged by exhanst gas outlet after layer, packing layer and spraying layer haptoreaction reverse with circulating absorption solution；
The described circulating absorption solution by the ejection of top, absorption tower spraying layer sequentially passes through packing layer, photochemistry
Enter bottom absorption tower after conversion zone and the reverse haptoreaction of flue gas, then delivered to light by circulating pump and urge
After changing regenerative response system regeneration, then in recycled pulp liquid bath, fill into ammonia, chelating agent, oxalic acid
Spray in tower with being transmitted back to the spraying layer on top, absorption tower as circulating absorption solution after ferrous sulfate.
Control to spray into Fe (II) EDTA+Fe (III) total concentration in the circulating absorption solution in absorption tower
Being 0.015～0.05mol/L, oxalate denominationby concentration is 0.09～0.3mol/L, and circulation is inhaled
The pH value receiving liquid is 5.0～5.5.
Concentrate bottom the absorbing liquid entering concentration tower drawn bottom described absorption tower and concentration tower
The circulation ejection of concentration tower top is sent into after the concentrated solution mixing that liquid circulating pump is drawn.
The concentrated solution entering iron removal system drawn bottom described concentration 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 of absorption tower epimere to hand over
For luminescence.
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 present invention is at the double tower synchronized desulfuring and denitrifying of existing compounding ammonia-Fe (II) EDTA chelating agent
Technique adds oxalic acid, oxalic acid and the iron ion in absorbing liquid and ferrous ion to circulating absorption solution
Generation ferric oxalate and Ferrox. can be reacted.Ferric oxalate and Ferrox. are oxalate denominationby and ferrum
The salt formed with ferrous ion.
In aqueous, under conditions of having oxygen, Ferrox. is easily oxidized to ferric oxalate.Oxalic acid
Ferrum can form stable ferric oxalate complexes in aqueous, and these complex have good light
Chemism, has relatively active redox characteristic, Fe therein under ultraviolet light irradiates3+
It is reduced into Fe2+, oxalate is oxidized and generate H under photocatalysis2O2.Photo-reduction is raw
The Fe become2+Again with H2O2React generation OH and Fe3+, Fe3+Again can be with oxalate denominationby
Re-form ferric oxalate complexes.As the oxalate denominationby and the H that there is excess in solution2O2Time,
To 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 oxidationAnd NO.
Oxalate denominationby is then constantly consumed with the carrying out of reaction, ultimately produces carbon dioxide.Inventor
Utilize ferric oxalate can produce the characteristic of OH free radical under photocatalysis, by under absorption just
The NO come is oxidized to nitrate anion to realize final removing, simultaneously by oxidized Fe3+It is reduced into
Fe2+.Fe in absorbing liquid2+The rising of concentration, the generation of beneficially Fe (II) EDTA, it is achieved
The regeneration of chelating agent.Above-mentioned course of reaction is complicated many courses of reaction, and research shows,
Circulating absorption solution adds oxalic acid reaction generation Ferrox. and combines illumination reaction, can either realize
The removing of part nitrogen oxides, moreover it is possible to substitute iron chip filter and realize chelating agent Fe (II) EDTA again
Raw, in present invention process, when Ferrox. and Fe (II) EDTA chelating agent use simultaneously,
It is possible not only to substitute traditional iron chip filter, it is also possible to reduce the use of Fe (II) EDTA chelating agent
Amount, effectively reduces 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 complexes absorption in absorbing liquid
Fe(II)EDTA、By the dioxygen oxidation in flue gas be Fe (III) EDTA,B, owing to photochemical reaction layer has the cancellated light bar of multilamellar, it is provided that
Effective illumination condition, contains in absorbing liquidUnder photocatalysis, change
Learn reaction, 2 moleculesUltimately generate the Fe of 1 molecule2+With 1 hydroxyl freely
Base OH, the hydroxy radical OH of generation, in further oxidative absorption liquidAnd NO；
The nitrogen oxides absorbed is oxidized, oxidized Fe3+It is reduced, there is synchronizing regeneration and make
With；C, the cancellated light bar of multilamellar is similar to filling-material structure, beneficially circulating absorption solution with
Uniform and the uniform mixing of flue gas, and extend flue gas and circulating absorption solution gas-to-liquid contact in this
The renewal of time, beneficially gas-liquid interface, circulating absorption solution and flue gas react and regenerate,
Further increase removal effect.
In order to ensure regeneration effect, the voidage of the most cancellated light bar is 0.6-0.9,
Crossing conference causes the specific surface area of gas-to-liquid contact too small, causes tower effect low, and too small meeting causes gas phase
Resistance increases, and preferably the most luminous by controlling the cancellated light bar of adjacent two layers side
Formula, can make absorbing liquid be substantially carried out regenerative response, then not in a luminous floor light bar district
A luminous floor light bar district is substantially carried out absorbing reaction, it is ensured that efficiently carrying out, finally of each reaction
Realize the purpose of high-efficiency desulfurization denitration.Experiment shows, uses the most luminous control mode ratio complete
Luminous control mode reaction efficiency is higher and the most energy-conservation.
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, circulating absorption solution mesoxalic acid
Iron complex issues raw Photochemical redox reaction, Fe at illumination condition3+It is reduced into Fe2+,
Generation simultaneously has the hydroxy radical OH, NO absorption got off of strong oxidizing property and is oxidized to nitre
Acid group is to realize final removing.Fe3+It is reduced into Fe2+, Fe in solution2+Concentration raise, beat
Break Fe3+With the complexation equilibrium of EDTA, Fe (III) EDTA concentration reduces, and Fe (II) EDTA is dense
Degree increases, it is achieved that the regeneration of Fe (II) EDTA, utilizes photo catalysis reactor to replace traditional
The iron chip filter of iron filings tower, reduces except ferrum cost, it is to avoid iron filings consumption is big, ferrum in absorbing liquid
The dense generation from too high problem of ion, improves the quality of side-product.
Further, the partial concentration liquid being sent to iron removal system drawn bottom described concentration tower is first
Sending into concentrating and precipitating pond precipitation, after staticly settling, the suspension bottom concentrating and precipitating pond is sent into
Described Photocatalytic Regeneration response system, iron removal system sent into by the clear liquor of epimere.Use to concentrate and sink
Concentrated solution is concentrated layering by pond, shallow lake, and the suspension that bottom ferric oxalate content is high is urged by light as oxalic acid
Changing regenerative response system and fill in circulating absorption solution, iron removal system then sent into by the clear liquor of epimere
Carry out, except ferrum, both to have reduced the consumption of ferrum in solution, and the burden of iron removal system can having been alleviated again, carry
The de-ironing efficiency of highly enriched liquid, reduces the iron content in side-product.
Ammonia, chelating agent, oxalic acid and the amount of filling into of ferrous sulfate in recycled pulp liquid bath in the present invention
Can be according to ammonium sulfate concentrations, Fe (II) EDTA+Fe (III) concentration, oxalate in circulating absorption solution
The requirement of ion concentration and solution ph fills into, in line with damaging, and the principle mended.
Beneficial effect:
(1) compound in synchronized desulfuring and denitrifying technique add at flue gas ammonia and Fe (II) EDTA
Oxalic acid, owing to oxalic acid is a kind of stronger reducing agent, oxalic acid plays the oxygen oxygen in suppression flue gas
Change Fe2+Effect, it is ensured that absorbing liquid has Fe (II) EDTA of higher concentration, is conducive to de-
Nitre；Be easy to get owing to the market of oxalic acid is with low cost, have energy-saving and cost-reducing, reduce operating cost,
Usage amount and the loss amount of EDTA in chelating agent can be reduced simultaneously.
(2) photochemical reaction layer is set on top, absorption tower, makes inversely contact with flue gas to follow
Ring absorbing liquid is the regeneration of limit ABSORPTION EDGE in photochemical reaction layer, improves the denitration efficiency to flue gas；
Further use the most luminous control mode than full-luminous control mode reaction efficiency more
Height, and the most energy-conservation, also improve the service life of light bar.
(3) utilize concentrating and precipitating pond precipitation that concentrated solution carries out precipitated and separated, improve returning of ferrum
Yield, reduces the burden of iron removal system, improves the quality of side-product.
(4) the suspension ferric oxalate concentration bottom concentrating and precipitating pond is high, enters Photocatalytic Regeneration
Response system, improves regeneration effect and denitration efficiency.
(5) use the inventive method that the NO absorbed can carry out oxidation to convert, to denitration
Chelating agent carries out reducing/regenerating, and denitration efficiency is up to more than 50%.Present invention process is simple, easily
In operation, good reliability.
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-concentration tower, 2-absorption tower, 2.1-packing layer, 2.2-spraying layer, 2.3-
Scrubber layer, 2.4-photochemical reaction layer, 3-iron removal system, 4-Photocatalytic Regeneration response system,
5-recycled pulp liquid bath, 6-concentrating and precipitating pond, 7-crystal system.
Detailed description of the invention
Embodiment:
See Fig. 1, in certain flue gas desulphurization system, exhaust gas volumn about 14～16Nm3/ h, SO2Concentration:
800～1200mg/Nm3, NOx concentration (predominantly NO): 300～400mg/Nm3.Desulfurization is adopted
Be double tower process.Enter concentration tower 1 top after flue gas is intensified, flow from top to bottom.
Flow process is sent to the ejection of concentration tower top with by tower 1 circulating pump that extract out at the bottom of tower, concentrated
Concentrated solution (containing ammonia) co-current contact concurrent biochemical absorb reaction, absorb two in flue gas
Sulfur oxide and nitrogen oxides, wash the most of granule in flue gas simultaneously.
Physical parameter and the relevant components of concentrated solution are as follows:
PH value: 5.0～5.5；
Ammonium sulfate concentrations: 20～45% (mass percent)；
EDTA-Fe (II)+EDTA-Fe (III) concentration: 0.045～0.15mol/L；
Concentration of oxalic acid: 0.27～0.9mol/L；
Absorbing liquid temperature: 50-55 DEG C.
Flue gas flow in the middle part of concentration tower 1 after through connection flue introduce absorption tower 2 middle part, inhale
Receive in tower 2 flue gas from the bottom to top through at least one of which photochemical reaction layer 2.4 (in the present embodiment
For two-layer), packing layer 2.1 and spraying layer 2.2 flow to top of tower, last scrubbed layer 2.3
Washing heel row is toward chimney further.
Physical parameter and the relevant components of circulating absorption solution are as follows:
PH value: 5.0～5.5；
Ammonium sulfate concentrations: 5～15% (mass percent)；
EDTA-Fe (II)+EDTA-Fe (III) total concentration: 0.015～0.05mol/L；
Concentration of oxalic acid: 0.09～0.3mol/L；
Absorbing liquid temperature: 50 DEG C.
The flue gas risen is inhaled with the circulation from top to bottom sprayed out in photochemical reaction layer 2.4
Receive liquid generation chemical absorbing reaction (course of reaction principle sees Fig. 2), the titanium dioxide in flue gas
Sulfur and nitrogen oxides are absorbed；The oxygen effect carried due to flue gas, there is also pair simultaneously
Fe (II), Fe (II) EDTA in reaction i.e. circulating absorption solution andBy flue gas
In dioxygen oxidation be Fe (III), Fe (III) EDTA andThe most oxidized generation
Fe (III) further react with the oxalate denominationby in circulating absorption solution generation ferric oxalate complexation
Thing Fe (C2O4)+、WithDeng；Owing to photochemical reaction layer 2.4 is to circulation
Absorbing liquid has regeneration effect, the nitrogen oxides got off by absorption and oxidized Fe (III) EDTA
It is reduced therewith, there is synchronizing regeneration effect (course of reaction principle sees Fig. 3).
Circulating absorption solution carries out the main as follows of 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'sThe Fe of 1mol is generated after light-catalyzed reaction2+, consume 1mol's
Oxalate denominationby, provides the further oxidative absorption of hydroxy radical OH of 1mol to get off simultaneously
NO, owing to consuming oxalic acid root, Fe2+Generation broken the complexation equilibrium of Fe (III) EDTA
Concentration, generates Fe (II) EDTA, i.e. Fe (II) EDTA and is regenerated.
Described photochemical reaction layer 2.4 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 2.4 on tower 2 top alternately to send out
Light.
In bottom, absorption tower, by recycled pulp liquid pump by absorbing liquid from the circulation fluid absorbing liquid of tower bottom
Draw and enter Photocatalytic Regeneration response system 4 (being the photo catalysis reactor being provided with light source), can
By sunlight, and auxiliary light irradiates, in circulating absorption solutionCarry out photocatalysis
Reaction: 2mol'sThe Fe of 1mol is generated after light-catalyzed reaction2+, consume 1mol
Oxalate denominationby, provide the hydroxy radical OH of 1mol, under further oxidative absorption simultaneously
The NO come.Owing to consuming oxalic acid root and Fe3+, Fe in solution2+Concentration raise, break
Fe3+With the complexation equilibrium of EDTA, Fe (III) EDTA concentration reduces, and Fe (II) EDTA concentration increases
Add, it is achieved that the regeneration of chelating agent Fe (II) EDTA.
The portion extracted out bottom 6-9L serosity and concentration tower 1 is drawn per hour bottom absorption tower 2
Divide concentrated solution to be sprayed into by concentration tower 1 epimere after merging, bottom concentration tower 1, draw 2 per hour
-3L serosity enters concentrating and precipitating pond 6,30-40 hour sedimentation time, and supernatant enters and removes
(i.e. electrolysis removes iron reactor to ferrum system 4, and such as number of patent application is 201520886784.2, sends out
Bright entitled " a kind of oriented flow electrolysis unit ", it is also possible to remove ferrum as principle with electrolysis for other
Electrolysis reactor), it is anti-that the suspension that lower floor's ferric oxalate content is higher is transmitted back to Photocatalytic Regeneration
Answer system 4.
Recycled pulp liquid bath 5 is sent into by the serosity of Photocatalytic Regeneration response system 4 Base top contact, to
The ammonia of consumption, chelating agent (Fe (II) EDTA), oxalic acid is filled into full in recycled pulp liquid bath 5
The related property parameter request of foot circulating absorption solution, finally sends into spraying layer 2.2 and sprays into absorption tower
In 2；Ammonium sulfate by-product is produced except the concentrated solution after ferrum enters crystal system 7 through iron removal system 3
Product, containing EDTA in remaining solution, can loopback Photocatalytic Regeneration response system 4.
Present invention process relates to the ammonia process of desulfurization, Fe (II) EDTA complexation denitration and regenerative response
Etc. existing popular response, its principle, compared with technology, is not described in detail here.At said method
NOx removal efficiency more than 50%, SO in flue gas after reason2Removal efficiency more than 90%.
Claims (9)
1. a synchronization denitration chelating agent regeneration technology based on flue gas ammonia method desulfurizing, including cigarette
Sending into concentration tower and concentrated solution haptoreaction in tower after gas supercharging, the flue gas going out concentration tower sends into suction
Receive tower and by absorption tower after the reverse haptoreaction of circulating absorption solution of tower top spraying layer ejection
Top is discharged；The reacted concentrated solution of extension at the bottom of concentration tower tower send after iron removal system is except ferrum
Enter ammonium sulfate crystallization system, it is characterised in that described flue gas is by the smoke inlet in the middle part of absorption tower
Enter absorption tower, sequentially pass through at least one of which photochemical reaction layer, packing layer that tower top is arranged
Discharged by exhanst gas outlet after haptoreaction reverse with spraying layer and circulating absorption solution；Described by absorbing
The circulating absorption solution of tower top spraying layer ejection sequentially passes through packing layer, photochemical reaction layer and cigarette
QI rising in reverse order enters bottom absorption tower after haptoreaction, then is delivered to Photocatalytic Regeneration reaction by circulating pump
After system regeneration enter recycled pulp liquid bath, then fill in recycled pulp liquid bath ammonia, chelating agent,
The spraying layer that oxalic acid and ferrous sulfate are transmitted back to top, absorption tower as circulating absorption solution sprays into tower
In.
A kind of synchronization denitration complexation based on flue gas ammonia method desulfurizing
Agent regeneration technology, it is characterised in that control to spray in the circulating absorption solution in absorption tower
Fe (II) EDTA+Fe (III) total concentration is 0.015～0.05mol/L, oxalate denominationby concentration
Being 0.09～0.3mol/L, the pH value of circulating absorption solution is 5.0～5.5.
A kind of synchronization denitration based on flue gas ammonia method desulfurizing
Chelating agent regeneration technology, it is characterised in that the entrance concentration tower drawn bottom described absorption tower
The concentrated solution that absorbing liquid is drawn with concentrated solution circulating pump bottom concentration tower sends into concentration tower after mixing
Top circulation ejection.
A kind of synchronization denitration complexation based on flue gas ammonia method desulfurizing
Agent regeneration technology, it is characterised in that draws bottom described concentration tower enters the dense of iron removal system
Contracting liquid first sends into concentrating and precipitating pond precipitation, and the suspension bottom concentrating and precipitating pond is sent into described light and urged
Changing regenerative response system, iron removal system sent into by the clear liquor of epimere.
A kind of synchronization denitration based on flue gas ammonia method desulfurizing
Chelating agent regeneration technology, it is characterised in that described photochemical reaction layer is cancellated by multilamellar
Light bar forms, and described light bar is connected with power supply through binding post.
A kind of synchronization denitration complexation based on flue gas ammonia method desulfurizing
Agent regeneration technology, it is characterised in that the voidage of described cancellated light bar is 0.6-0.9.
7. a kind of based on flue gas ammonia method desulfurizing the synchronization denitration as described in claim 5 or 6
Chelating agent regeneration technology, it is characterised in that control phase in the photochemical reaction layer of absorption tower epimere
The alternately luminescence of the adjacent cancellated light bar of two-layer.
8. the synchronization denitration based on flue gas ammonia method desulfurizing as described in claim 1 or 3 or 4
Chelating agent regeneration technology, it is characterised in that described Photocatalytic Regeneration response system is for being provided with light source
Photo catalysis reactor.
A kind of synchronization denitration complexation based on flue gas ammonia method desulfurizing
Agent regeneration technology, it is characterised in that described iron removal system removes iron reactor for electrolysis.
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| CN112742190A (en) * | 2020-12-11 | 2021-05-04 | 攀钢集团攀枝花钢铁研究院有限公司 | Complexing denitration process capable of recycling |
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| CN112717694A (en) * | 2020-12-11 | 2021-04-30 | 攀钢集团攀枝花钢铁研究院有限公司 | Regeneration method of ineffective complexing denitration agent |
| CN112742190A (en) * | 2020-12-11 | 2021-05-04 | 攀钢集团攀枝花钢铁研究院有限公司 | Complexing denitration process capable of recycling |
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