CN109260918A - A kind of flue gas desulfurization and denitrification integral method and its dedicated unit - Google Patents
A kind of flue gas desulfurization and denitrification integral method and its dedicated unit Download PDFInfo
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Abstract
The invention discloses a kind of flue gas desulfurization and denitrification integral method and its dedicated unit, this method is to carry out scrubbing CO_2 and removing nitrogen oxides to flue gas simultaneously using wet processing in the same process system；Desulfurization uses ammonia fertilizer method, and the neutralizer for the by-product nitric acid that ammonium hydroxide is used as sulphur dioxide desulfurizing agent and denitrating technique to generate simultaneously uses；Denitration uses oxidation-reduction method, make nitrogen oxides as reducing agent using desulfurizing byproduct sulfurous acid ammonium salt or ammonium bisulfite, and urea is added as reducing agent, to contain quinone-hydroxy compounds as catalyst, it is blown into air to denitration circulation fluid, provides dissolved oxygen and oxidant for nitric oxide production oxidation reaction；Denitration reaction by-product ammonium salt imports doctor solution and recycles nitrogenous ammonium salt；Ammonia nitrogen chemistry fertilizer ammonium sulfate and ammonium nitrate are recycled, and full technical process discharges sulfur-bearing or waste liquid containing ammonia nitrogen not to outside system.The present invention is able to achieve desulfurization and denitrification integral, device miniaturization, and makes technical process without waste liquid outlet.
Description
Technical field
The present invention relates to flue gases and the catalytic cracked regenerated flue gas of oil plant coal-fired, that oil burning boiler burning is raw
Desulphurization denitration process field, the sulfuric acid tail gas process field of gas washing in SA production, chemical fertilizer production vent gas treatment etc. contain sulfur dioxide, nitrogen
The exhaust-gas treatment field of oxide component.More particularly to a kind of flue gas desulfurization and denitrification integral method and its dedicated unit.
Background technique
With the rapid development of our country's economy, the increase of industrial pollution source and corresponding legislations of environmental protection are more and more tighter
Lattice.The progress for having pushed environmental improvement science and technology simultaneously, produces large quantities of environomental pollution source Treatment process.Wherein in relation to flue gas
Scrubbing CO_2, nitrogen oxides technology developed a variety of techniques, but these technical functionality features are nearly all only
For single kind of component.Technology in terms of removing sulfur dioxide of flue gases, there is ammonia process, lime-gypsum method, Dual alkali, sodium
Alkaline process, such as sodium-hydroxide method or hydroxide magnesium processes.Technology in terms of denitration has dry method, the selective catalysis of dry method main technique
Reduction method (SCR), selective non-catalytic reduction method (SNCR) and SCR-SNCR mix reduction method.The common feature of dry method be with
Ammonia is as reducing agent.Difference is that SCR method is to mix to pass through catalytic bed with ammonia under 350~390 DEG C of flue-gas temperatures, wherein nitrogen
Oxide (NO+NO2) and ammonia are by the oxygen components redox in flue gas at nitrogen and aqueous vapor.Reaction equation are as follows:
4NH3+4NO+O2==4N2+6H2O, or
4NH3+3NO+O2==6N2+6H2O,
And SNCR method is to spray into reducing agent ammonia or urea under conditions of no catalyst flue-gas temperature is at 900~1250 DEG C, in cigarette
The effect of gas oxygen content is lower to occur redox reaction, and nitrogen oxides is reduced to nitrogen and aqueous vapor.Reaction equation are as follows:
4NO+NH3+O2==N2+H2O, SCR-SNCR mixing method be using front SNCR method escape reducing agent as after
The reducing agent of portion's SNCR method.The operation denitration efficiency of denitration twice reaches highest, may finally reach 80% or more.
There are also energetic plasma oxidizing process, absorption method, wet processes etc. other than Dry denitration.SCR method denitration efficiency is opposite
Higher, industrial application is wide, high but there are construction investment and operating costs, catalyst because of dust-laden and easy in inactivation, ammonia
The problems such as escapement ratio is difficult to control.SNCR method industrial application is also than wide, without catalyst, using ammonia or urea as nitrogen oxygen
The reducing agent of compound, it is desirable that NH3/NOx molar ratio is not less than 2~2.3, and denitration efficiency can be only achieved 30~50%, at high temperature
Reaction, there is also the escapement ratio problem of ammonia, ammonia reaction has the generation of side reaction product NOx under high temperature, causes secondary pollution
Source.
Although energetic plasma oxidizing process denitration efficiency effect is high, energy consumption is higher, and cost of equipment is more expensive, operation
Costly, the disadvantages such as maintenance of equipment expense height influence its application industrially.
Absorption method technics comparing is simple, but adsorbent amount is big, and adsorption plant capacity is also very big, and adsorbent reactivation is complicated
Difficulty, equipment operation resistance is big, therefore is not suitable for the denitration process of large-scale flue gas.
Also there are many kinds of processes for wet denitration technology, there is alkali absorption method, sour absorption process, oxidative absorption method, reduction
Absorption process, Absorption via Chemical Complexation, microbial method etc..
Alkali absorption method is in the method for the alkaline solution absorptions nitrogen oxides such as potassium, sodium, magnesium, ammonium.But NO is in aqueous solution
Dissolubility is very low, and lye can only absorb the NO2 being dissolved in the water, therefore to may be only available for NOx content higher for alkali absorption method, or
Without the very low gas of NO or NO content.Therefore it is very low alkali absorption method to be used for denitrating flue gas efficiency.
Sour absorption process is to absorb NO+NO2 using acid solution, and nitrogen oxides is easily dissolved in acid solution, moreover it is possible to the concentrated sulfuric acid
Reaction generates nitrous acid sulfuric acid, but cannot react with dilute sulfuric acid and generate nitrous acid sulfuric acid.The concentrated sulfuric acid is needed due to absorbing, no
Suitable for commercial scale.
Oxidative absorption method is that NO is oxidized to NO2 or NOx using oxidant, and common oxidant has ozone, hydrogen peroxide,
NO is first oxidized to NOx by hydrogen peroxide, sodium chlorite, sodium hypochlorite, potassium permanganate, nitric acid etc., is then converted into nitrate anion generation
Nitrate.NO effectively can be oxidized to NOx by oxidative absorption method, but by-product is nitrate, chlorate etc., to aquatic environment
It is harmful.In addition, oxidant consumption is costly, raw section is at high cost, and by-product is corrosive to equipment.Therefore oxidative absorption method
Using depositing limitation.
Reducing absorping method is using gas phase or liquid phase catalytic oxidation effect by NO partial oxidation is at NO2 or NOx in flue gas, so
NO2 or NOx is reacted with NO afterwards generates N2O4 or N2O3.It is finally reduced into N2 and water.Common reducing agent has sulphite, thio
Sulfate, the aqueous solution of the compounds such as urea.
Absorption via Chemical Complexation is directly to be transferred to the NO of indissoluble from gas phase with complex form using liquid complexing absorbent
Liquid phase improves NO in the solubility of liquid phase.When reducing agent is added in the liquid phase, NO reduction generates elemental nitrogen in complex compound, when
Have in solution and generates salt when alkali compounds and be fixed up.Complexed absorption law technology is in research and development stage, Shang Mo at present
Realize industrialization, but reduction can be combined with oxidizing process and realize desulfurization and denitrification integral and reach higher by this method
Efficiency, therefore Absorption via Chemical Complexation is a kind of very promising technology.
In summary various denitration technologies, except Dry denitration technology outside the pale of civilization, the liquid phase denitration technology that has been carried out large scale industry
Extensively, main cause has a single function in addition to denitration efficiency is high not as good as dry method SCR method and is confined to denitration at application at present still end.And
And the oxidant used, the absorbents price such as reducing agent is more expensive and the product lower recycling difficulty of concentration in the solution,
It stays and secondary pollution is generated to ambient water quality in the solution.But wet process liquid phase denitrating technique plant construction expense is relatively low,
Operating cost is also lower than dry method, and operating condition is also more relaxed.Therefore, the exploitation of wet process liquid phase denitration technology and desulphurization denitration one
The research of change technology is very valuable and technical prospect project.
Summary of the invention
Goal of the invention: the deficiencies in the prior art are directed to, the object of the present invention is to provide a kind of flue gas desulfurization and denitrifications
Flue gas scrubbing CO_2 and removing nitrogen oxides (NO+NOx) are integrated into a system by integrated method, are used
Wet type liquid desulfuration denitrating technique, desulfurization are combined with denitration, not discharging any waste liquor, and not outer waste air reaches zero-emission.Of the invention
Another object is to provide a kind of dedicated unit of above method.
Technical solution: in order to achieve the above-mentioned object of the invention, The technical solution adopted by the invention is as follows: a kind of flue gas desulfurization is de-
Nitre integral method: in the same process system using wet processing simultaneously to flue gas carry out scrubbing CO_2 (SO2) and
It removes nitrogen oxides (NO+NOx)；Desulfurization uses ammonia fertilizer method, and ammonium hydroxide is used as sulphur dioxide desulfurizing agent and denitrating technique to generate simultaneously
By-product nitric acid neutralizer use；Denitration uses oxidation-reduction method, with desulfurizing byproduct sulfurous acid ammonium salt or bisulfite
It is reducing agent that ammonium, which makees nitrogen oxides (NO+NO2), and adds urea as reducing agent, to contain quinone-hydroxy compounds as catalysis
Agent is blown into air to denitration circulation fluid, and the oxidation reaction for nitric oxide (NO) provides dissolved oxygen and oxidant；Denitration reaction pair
It produces ammonium salt and imports the nitrogenous ammonium salt of doctor solution recycling；Recycle ammonia nitrogen chemistry fertilizer ammonium sulfate and ammonium nitrate, and full technical process
Sulfur-bearing or waste liquid containing ammonia nitrogen are discharged not to outside system.
The nitric oxide production oxidation is come from using ammonium sulfite or sulphur hydracid ammonium and air, ammonium sulfite or ammonium hydrogen sulfate
Ammonia fertilizer method desulphurization circulating liquid, air fill into the dissolution then generated under the action of catalyst with hydrogen peroxide form by oxygen complementation device
Oxygen.
The catalyst is a kind of containing quinone-hydroxyl soluble compound, can be from hydroxy compounds under oxygen effect
It is converted to quinone based compound, photosensitive article object, and dissolved oxygen and water can be converted to peroxide water.
The whereabouts of denitration reaction rich solution is to be blended into participate in generating nitrogenous nitrogenous fertilizer in doctor solution.
The desulfurization reactor and Benitration reactor equipment use hypergravity bed, and two hypergravity beds independently can separately be set
It sets, can also overlap on the same axis.
The dedicated unit of above-mentioned flue gas desulfurization and denitrification integral method, including devulcanizer, denitrator, demister, doctor solution
Medial launder, denitration liquid medial launder, doctor solution oxidation trough, denitration liquid oxygenating slot, ammonium sulfate inspissator, ammonium sulfate liquor crystallization
Slot, ammonium sulfate crystallization centrifuge, ammonium sulfate drier and self-adsorption ejector；The devulcanizer passes through flue gas pipeline and denitration
Device communicates；The denitrator is communicated by pipeline with demister；The devulcanizer passes through solution circulation line and doctor solution
Medial launder communicates, and sets circulating pump on solution circulation line；The doctor solution medial launder is communicated with doctor solution oxidation trough, described
Doctor solution oxidation trough communicated with flue gas pipeline；The doctor solution oxidation trough is successively concentrated with ammonium sulfate by pipeline
Device, ammonium sulfate liquor crystallization tank, ammonium sulfate crystallization centrifuge and ammonium sulfate drier communicate；It is crystallized in the ammonium sulfate liquor
Return line is equipped on slot and ammonium sulfate crystallization centrifuge to communicate with doctor solution medial launder；The denitrator by pipeline with
Denitration liquid medial launder communicates；The denitration liquid medial launder by pipeline successively with self-adsorption ejector and denitration liquid oxygenating slot phase
It is logical；The denitration liquid oxygenating slot is communicated by pipeline with denitrator；The denitration liquid medial launder passes through pipeline and doctor solution
Medial launder communicates；The demister is communicated by pipeline with denitration liquid medial launder.
The integrated method of flue gas desulfurization and denitrification of the invention is by flue gas scrubbing CO_2 and removing nitrogen oxides
(NO+NOx) it is integrated into a system, using wet type liquid desulfuration denitrating technique, the removing of sulfur dioxide uses ammonium hydroxide-ammonium salt
Method, removal of nitrogen oxide use urea for reducing agent, to contain quinone-hydroxyl compound as electric reduction catalyst, catalysis
Agent can be tannin extract or naphthoquinone sulfonic acid salt, is blown into the dissolved oxygen content that air improves solution to solution, mixes to denitration solution
Sulfur removing pregnant solution increases denitration solution and contains the reproducibilities compounds such as NH4HSO3, (NH4) 2SO3 or SO2, denitration rich solution is discharged into
Remaining urea and ammonium nitrate are recycled in desulfuration solution, the final nitrogen pool and yield for increasing chemical fertilizer, the useless sky of sulfur removing pregnant solution oxidation
Gas returns to flue gas and increases oxidation and dissolubility that Oxygen Amount in Flue Gas favorably improves NO, and not discharging any waste liquor is combined in desulfurization with denitration, not outer
Waste air reaches zero-emission.
Flue gas desulfurization and denitrification principle is as follows:
(1) desulfurization unit main chemical reactions
Dissolution of the ammonia in desulfuration solution:
NH3+NH4HSO3==(NH4) 2SO3,
NH3+NH4HSO4==(NH4) 2SO4,
Doctor solution ammonium hydroxide and ammonium salt solution sulfur dioxide absorption:
NH3 Bian 2O+SO2==NH4HSO3,
(NH4) 2SO3+H2O+SO2==2NH4HSO3,
(NH4) 2SO4+SO2+H2O==2NH4HSO3,
Urea and nitric acid recycling are converted to ammonium salt:
HNO3+NH3=NH4NO3,
2 (NH2) 2CO+4H2O+4SO2+O2==4NH4SO3+2CO,
Sulfite oxidation is at ammonium sulfate:
(NH4) 2SO3+O2==(NH4) 2SO4,
NH4HSO3+O2==NH4HSO4,
NH4HSO4+NH3=(NH4) 2SO4,
(2) denitration unit main chemical reactions:
Reduction-state catalyst absorbs oxygen and oxidation regeneration reaction occurs, and generates active oxygen:
Reduction-state (RQ-OH)+0.5O2==oxidation state (RQ=O)+H202,
Oxidized catalyst oxygen supply oxidation NO: the addition of catalyst improves dissolution of the air oxygen amount in denitration liquid, promotes NO's
Oxidation and dissolution.
Oxidation state (RQ=O)+NO+H2O==reduction-state (RQ-OH)+NO2,
Active oxygen aoxidizes NO:
NO+H2O2==NO2+H2O,
2NO2+H2O=HNO2+HNO3,
2NO2==N2O2,
NO+NO2==N2O3,
N2O3+H2O==2HNO2,
N2O2+H2O==HNO2+HNO3,
The reduction reaction of reproducibility compound: the ammonium sulfite or sulfurous acid generated in reducing agent urea and doctor solution is added in denitration
Hydrogen ammonium has the reducing agent of oxidation susceptibility to nitrogen oxides, and nitrogen oxides is reduced to nitrogen, carbon dioxide, and generates ammonium salt.
The extraction section from circulation desulfurization liquid
Solution is blended into denitration circulation fluid, and purpose is exactly to be supplement and increase denitrification reducing agent, makes the reduction reaction of nitrogen oxides
Efficiency improves.
(NH2) 2CO+HNO2==2N2+CO2+3H20,
4 (NH4) 2SO3+2NO2==4 (NH4) 2SO4+N2,
2 (NH4) 2SO3+2NO==2 (NH4) 2SO4+N2,
4NH4HSO3+2NO2==4NH4HSO4+N2,
2NH4HSO3+2NO==2NH4HSO4+N2.
Oxidation reaction in oxygenating slot:
2HNO2+O2==2HNO3,
HNO3+NH3==NH4NO3,
2NH4HSO3+O2==2NH4HSO4,
2 (NH4) 2SO3+O2==2 (NH4) 2SO4.
The utility model has the advantages that compared with prior art, the invention has the advantages that 1) using containing quinone-hydroxy compounds as oxygen
Change reducing catalyst, improves meltage and nitric oxide production oxygenation efficiency of the air oxygen in denitration solution；2) desulfuration solution is utilized
In sulfurous acid ammonium salt as denitration reducing agent improve nitrogen oxides (NO+NO2) reduction efficiency；3) denitration rich solution is added
Desulfurization follows nitric acid, ammonium nitrate and the remaining urea in liquid recycling denitration waste liquid, and makes technical process without waste liquid outlet；4)
The technical process of two differential responses conditions of scrubbing CO_2 and nitrogen oxides is integrated into one by desulfurization and denitrification integral
In system, connects each other and do not interfere with each other；5) desulfurization and denitrification reaction device uses hypergravity bed surrogate response tower, and realization device is small
Type.
Detailed description of the invention
Fig. 1 is the process flow chart of flue gas desulfurization and denitrification integral method.
Specific embodiment
The present invention will be further explained combined with specific embodiments below.
A kind of flue gas desulfurization and denitrification integral method, process flow is as shown in Figure 1, flue gas A first passes through bag filter in advance
Solid particle ash content is removed, temperature, which carries out once exchanging heat at 150 DEG C or so, enters flue gas desulfurization device 1, desulfurization to 100 DEG C or so
Device 1 uses hypergravity bed or tower absorbing device.Ammonium hydroxide D is added to doctor solution medial launder 4, uses ammonium salt solution as desulfuration solution,
Doctor solution C is recycled into indentation 1 sulfur dioxide absorption gas of devulcanizer with pump and generates ammonium bisulfite or ammonium sulfite.Desulfuration solution
Doctor solution medial launder 4 is flowed into from devulcanizer 1 after washing smoke absorption sulfur dioxide.It is mended to 4 desulphurization circulating liquid of doctor solution medial launder
It fills after ammonium hydroxide D and washs flue gas through circulation pumped back devulcanizer 1 again.When doctor solution ammonium salt-containing concentration is in 350~450g/L, from following
Extension rich solution is sent to doctor solution oxidation trough 6 after the pump of ring pump, while air blower is blown into air F to doctor solution oxidation trough 6,
The sub- sour ammonium acid salt of acid, which is oxidized, in doctor solution oxidation trough 6 is converted to ammonium sulfate normal salt.Oxidizing reaction temperature is controlled 60~80
DEG C, to improve conversion rate of oxidation.The oxidation solution P of doctor solution oxidation trough 6 is sent with pumping to ammonium sulfate inspissator 8 to be added with low pressure
Hot vapour X heating evaporation is concentrated into ammonium sulfate concentrations and reaches 50% or more.Concentrate is sent to ammonium sulfate liquor crystallization tank 9 with cold again
But water W is cooling makes mother liquor that crystallization be precipitated and grow up in crystallization tank.Crystalline mother solution is finally sent into ammonium sulfate crystallization centrifuge
10 separation crystal and filtrate, filtrate L and crystallization tank flowing full go out dilute crystalline mother solution Z foldback doctor solution medial launder 4 together.Centrifuge separation
Ammonia sulfate crystal out send ammonium sulfate drier 11 dry with low-pressure steam X thermal dehydration, obtains commodity ammonium sulfate products S.
In addition, the doctor solution M that extraction section end aoxidizes after circulating pump, which is sent to denitration solution system, supplements denitrification reducing agent.
Flue gas after 1 desulfurization process of devulcanizer is re-fed into denitrator 2, washs smoke absorption nitrogen using denitration circulation fluid
Oxide (NO+NOx).Denitration circulation fluid is made of completion pair components such as catalyst, denitrification reducing agent urea and sulfurous acid ammonium salts
Oxidation, dissolution and the reduction reaction of flue gas oxynitrides.Flue gas after denitration enters the removing of demister 3 after leaving denitrator 2
The liquid foam of entrainment, last discharge system.Rich solution after denitration absorbs flows into denitration liquid medial launder 5, then through circulation fluid pumping force feed
Enter the sucking air F of self-adsorption ejector 12 and denitration liquid is blended in 7 oxidation regeneration catalyst of denitration liquid oxygenating slot and increases denitration
The dissolved oxygen content of liquid.Then denitration liquid I is pumped from denitration liquid oxygenating slot 7 with denitration liquid circulating pump continuously to wash to denitrator 2
Flue gas.Partial denitrification liquid N is separated after pump is returned to doctor solution medial launder 4 to recycle ammonia nitrogen resource simultaneously.Denitration liquid oxygenating slot 7
Flue and flue gas converge discharge system together before the off-air remittance demister 3 of discharge.Denitrating catalyst K and reducing agent U is added
Denitration liquid medial launder 5.
Desulphurization reaction operation control solution (NH4) 2SO3/NH4HSO3 concentration ratio 2:1 or so, pH value is protected 6~8 or so
Solution is held to the absorbability of sulfur dioxide.Desulfurization absorption operation temperature controls within the scope of 70~90 DEG C.Oxidizing reaction temperature
Control keeps aoxidizing the rate answered within the scope of 65~75 DEG C.Total ammonia density in solution is within the scope of 350~450g/L.
Denitration reaction operation temperature controls within the scope of 70~85 DEG C, and pH value is in 5.5~6.5 ranges.Urea in solution
Concentration is 15~20% or so.Catalyst concn is within the scope of 20~60mg/L.
The flue gas desulfurization and denitrification integral method is to carry out scrubbing CO_2 to flue gas simultaneously in a process system
(SO2) and nitrogen oxides (NO+NOx) is removed.Using wet processing, desulfurization uses ammonia fertilizer method technique, using ammonium hydroxide as titanium dioxide
Desulfurizing agent of sulfur, the neutralizer as the by-product nitric acid that denitrating technique generates.Denitration uses oxidation-reduction method technique, with desulfurization pair
It is reducing agent that product sulfurous acid ammonium salt or ammonium bisulfite, which make nitrogen oxides (NO+NO2), and adds urea as reducing agent.
, as catalyst, to be blown into air to denitration circulation fluid, the oxidation reaction for nitric oxide (NO) provides containing quinone-hydroxy compounds
Dissolved oxygen and oxidant.Denitration reaction by-product ammonium salt imports doctor solution and recycles nitrogenous ammonium salt.Full technical process is not to system
Outer discharge sulfur-bearing or waste liquid containing ammonia nitrogen.Recycle ammonia nitrogen chemistry fertilizer ammonium sulfate and ammonium nitrate.Denitration uses oxidation-reduction method.It is added
Reducing agent of the urea as nitrogen oxides, nitric oxide production oxidation is using ammonium sulfite or sulphur hydracid ammonium and air, ammonium sulfite
Or ammonium hydrogen sulfate comes from ammonia fertilizer method desulphurization circulating liquid, air is filled by oxygen complementation device and then is generated under the action of catalyst with peroxidating
The dissolved oxygen of hydrogen form.In addition, the off-air residue oxygen remittance flue gas after solution oxygen complementation device and after sulfite oxidation device is latter
It is same to enter denitrification apparatus.Oxidation of nitric oxide reaction needed for oxygen by addition denitration solution catalyst catalytic action, this
Kind catalyst is a kind of containing quinone-hydroxyl soluble compound, and this catalyst can be from hydroxy compounds under oxygen effect
It is converted to quinone based compound, photosensitive article object, and dissolved oxygen and water can be converted to peroxide water.Peroxide water has oxidisability to nitric oxide, this
Kind quinone based compound, photosensitive article object, which can transmit charge, can have reproducibility.The whereabouts of denitration reaction rich solution is to be blended into doctor solution to participate in generating to contain
Nitrogen nitrogenous fertilizer.Therefore the waste liquor of ammonium containing nitric acid that denitrating technique process generates is final and desulfurization waste liquor converges production nitrogenous fertilizer.Desulphurization reaction
Device and Benitration reactor equipment use hypergravity bed.Two reactors can be independently provided separately, and can also be folded on the same axis
It closes.
Claims (6)
1. a kind of flue gas desulfurization and denitrification integral method, it is characterised in that: same using wet processing in the same process system
When to flue gas carry out scrubbing CO_2 (SO2) and remove nitrogen oxides (NO+NOx)；Desulfurization uses ammonia fertilizer method, and ammonium hydroxide is made simultaneously
For the neutralizer use for the by-product nitric acid that sulphur dioxide desulfurizing agent and denitrating technique generate；Denitration uses oxidation-reduction method, with
It is reducing agent that desulfurizing byproduct sulfurous acid ammonium salt or ammonium bisulfite, which make nitrogen oxides (NO+NO2), and adds urea as also
Former agent is that the oxidation of nitric oxide (NO) is anti-, as catalyst, to be blown into air to denitration circulation fluid containing quinone-hydroxy compounds
Dissolved oxygen and oxidant should be provided；Denitration reaction by-product ammonium salt imports doctor solution and recycles nitrogenous ammonium salt；Recycle ammonia nitrogen chemistry
Fertilizer ammonium sulfate and ammonium nitrate, and full technical process discharges sulfur-bearing or waste liquid containing ammonia nitrogen not to outside system.
2. flue gas desulfurization and denitrification integral method according to claim 1, it is characterised in that: the nitric oxide production oxidation
Using ammonium sulfite or sulphur hydracid ammonium and air, ammonium sulfite or ammonium hydrogen sulfate come from ammonia fertilizer method desulphurization circulating liquid, and air is by mending
The dissolved oxygen that oxygen device is filled into and then generated under the action of catalyst with hydrogen peroxide form.
3. flue gas desulfurization and denitrification integral method according to claim 2, it is characterised in that: the catalyst is that one kind contains
There is quinone-hydroxyl soluble compound, quinone based compound, photosensitive article object can be converted to from hydroxy compounds under oxygen effect, and energy will be molten
Solution oxygen and water are converted to peroxide water.
4. flue gas desulfurization and denitrification integral method according to claim 1, it is characterised in that: the whereabouts of denitration reaction rich solution
It is to be blended into participate in generating nitrogenous nitrogenous fertilizer in doctor solution.
5. flue gas desulfurization and denitrification integral method according to claim 1, it is characterised in that: the desulfurization reactor and de-
Nitre reactor apparatus uses hypergravity bed, and two hypergravity beds can independently be provided separately, can also overlap on the same axis.
6. the dedicated unit of flue gas desulfurization and denitrification integral method described in claim 1, it is characterised in that: including devulcanizer
(1), denitrator (2), demister (3), doctor solution medial launder (4), denitration liquid medial launder (5), doctor solution oxidation trough (6), denitration
Liquid oxygenating slot (7), ammonium sulfate inspissator (8), ammonium sulfate liquor crystallization tank (9), ammonium sulfate crystallization centrifuge (10), sulfuric acid
Ammonium drier (11) and self-adsorption ejector (12)；The devulcanizer (1) is communicated by flue gas pipeline with denitrator (2)；Institute
The denitrator (2) stated is communicated by pipeline with demister (3)；The devulcanizer (1) passes through solution circulation line and doctor solution
Medial launder (4) communicates, and sets circulating pump on solution circulation line；The doctor solution medial launder (4) and doctor solution oxidation trough (6)
It communicates, the doctor solution oxidation trough (6) is communicated with flue gas pipeline；The doctor solution oxidation trough (6) by pipeline successively with
Ammonium sulfate inspissator (8), ammonium sulfate liquor crystallization tank (9), ammonium sulfate crystallization centrifuge (10) and ammonium sulfate drier
(11) it communicates；Be equipped on the ammonium sulfate liquor crystallization tank (9) and ammonium sulfate crystallization centrifuge (10) return line with
Doctor solution medial launder (4) communicates；The denitrator (2) is communicated by pipeline with denitration liquid medial launder (5)；The denitration liquid
Medial launder (5) is successively communicated with self-adsorption ejector (12) and denitration liquid oxygenating slot (7) by pipeline；The denitration liquid oxygenating
Slot (7) is communicated by pipeline with denitrator (2)；The denitration liquid medial launder (5) passes through pipeline and doctor solution medial launder (4) phase
It is logical；The demister (3) is communicated by pipeline with denitration liquid medial launder (5).
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| CN112604487A (en) * | 2020-12-23 | 2021-04-06 | 陕西中科润达环保科技有限公司 | Flue gas denitration agent for cement kiln and preparation method and application thereof |
| CN112844028A (en) * | 2021-02-26 | 2021-05-28 | 陕西中科润达环保科技有限公司 | Industrial kiln flue gas denitration agent and preparation method and application thereof |
| CN113003817A (en) * | 2021-03-25 | 2021-06-22 | 沈阳大学 | Method for removing halogenated organic matters by using high-grade reduction system based on semi-dry flue gas desulfurization ash |
| CN113117493A (en) * | 2019-12-31 | 2021-07-16 | 中晶环境科技股份有限公司 | Method for flue gas desulfurization and denitration by using mixed reducing agent |
| CN113117485A (en) * | 2019-12-30 | 2021-07-16 | 中晶环境科技股份有限公司 | Method for desulfurization and denitrification by using ammonium bisulfite |
| EP3915668A1 (en) * | 2020-05-27 | 2021-12-01 | Ariel Scientific Innovations Ltd. | Catalytic oxidation and removal of nox/sox from flue gases |
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| CN115055034A (en) * | 2022-07-26 | 2022-09-16 | 北京清新环境技术股份有限公司 | Semi-dry treatment method and system for flue gas purification |
| CN115350588A (en) * | 2022-08-16 | 2022-11-18 | 沈阳三聚凯特催化剂有限公司 | Method for recycling inactivated iron system desulfurizer |
| CN115350588B (en) * | 2022-08-16 | 2024-04-12 | 沈阳三聚凯特催化剂有限公司 | Method for recycling deactivated iron-based desulfurizing agent |
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Application publication date: 20190125 |