CN104474859B - A kind of method of flue gas desulfurization and denitrification, device and application thereof - Google Patents
A kind of method of flue gas desulfurization and denitrification, device and application thereof Download PDFInfo
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Abstract
A kind of method that the invention discloses desulfurizing and denitrifying flue gas by electron beam, comprises the following steps: 1) the flue gas Water spray that boiler or combustion engine produce is processed, make flue gas cool-down；2) flue gas after cooling is mixed with ammonia, then carry out desulphurization denitration through ultraviolet irradiation and electron beam irradiation simultaneously.The method of the present invention can carry out desulfurization and denitration reaction simultaneously, simplifies technological process, decreases equipment and runs input.It is easy to get owing to ultraviolet generater is relatively inexpensive, so increasing ultraviolet generater in irradiation reaction device can reduce the power requirement of electron beam generating apparatus further, such that it is able to significantly reduce investment and the operating cost of electron beam generating apparatus.The invention also discloses should device in aforementioned manners and application thereof.
Description
Technical field
The present invention relates to filed of flue gas purification, utilize electron beam and UV treatment flue gas to take off particularly to one
The method of sulphur denitration, device and application thereof.
Background technology
Human health in the environmental pollution serious threat that atmosphere pollution brings.Wherein, including thermal power plant, cement
Sulfur dioxide and the nitrogen oxides of the large scale industry facilities exhaust such as factory, garbage burning factory cause atmosphere pollution
One of main source.Therefore, the flue gas desulfurization and denitrification problem of factory is the important of thing of curbing environmental pollution at present
Work.NO in the tail gas such as various large-scale diesel engines, engine of boat and ship, gas turbinexContent is higher, fall
NO in these combustion engine tail gas lowxConcentration is the most also focus of concern.In addition, thermoelectricity
Factory, cement plant, garbage burning factory etc. also give off substantial amounts of dioxin, and especially burning city domestic garbage produces
Two raw English attention degree are the highest.Dioxin is highly stable, is difficult to natural degradation in the environment and disappears
Remove, it is extremely difficult to be dissolved in water, majority of organic solvent can be dissolved in, be the liposoluble substance of colorless and odorless, so
It is very easy to accumulate in vivo, serious to harm.Dioxin in addition to there is carcinogenic toxicity,
Also there is genotoxicity and genetoxic, directly endanger the Health and Living of descendants.Therefore dioxin is dirty
Dye is the significant problem being related to mankind's living or death, it is necessary to be strictly controlled by.
The technology of electron beam irradiation desulphurization denitration is the purifying coal-fired flue gas technology that development in recent years is got up, at present
This technology has been enter into the commercial Application stage.This technology utilizes high-energy electron beam irradiation to contain sulfur dioxide (SO2)
With nitrogen oxides (NOx) etc. the flue gas of pollutant, by ionization and the excitation of electron beam, generation has
The free radical of strong oxidizing property.Simultaneously under conditions of being passed through ammonia and steam, these free radicals are to be exceedingly fast
Speed and the SO in flue gas2And NOXReaction, generates the accessory substance being mainly composed of ammonium sulfate and ammonium nitrate.Logical
Cross accessory substance collector and dust arrester removes accessory substance, the flue gas being purified.
Fig. 1 is the apparatus structure schematic diagram of existing electron beam irradiation flue gas desulfurization and denitrification.This electron beam irradiation cigarette
Desulfurization denitrating technique flow process is: it is pre-that the flue gas first produced by coal-burning boiler 1 sends into flue gas through the first flue 2
Treating column 3, this flue gas pretreater 3 is provided with nozzle system 4, can spray cooling water and make flue gas cool-down increase
The wet suitable condition to elimination reaction, then flue gas is sent into through the second flue 5 irradiation of irradiation reaction system
In reactor 7, this irradiation reaction system is added speed system 8 by irradiation reaction device 7 and electronics and forms, and second
Spraying into certain stoichiometric ammonia by flow control valve 6 on flue 5, then mixed flue gas enters irradiation in the lump
In reactor 7, under electronics adds the electron beam irradiation effect that speed system 8 produces, anti-through a series of chemistry
Ying Hou, the oxysulfide (SO in flue gas2) and nitrogen oxides (NOx) generate ammonium sulfate and ammonium nitrate, with
Flue gas after process enters accessory substance collector 9 through flue together and collects these products by delivery pipe 10,
And as fertilizer application, the flue gas after accessory substance collector 9 processes is entered in air by chimney 11.
There is following defect in above-mentioned prior art:
1), the when that electron beam irradiation desulphurization denitration processing, in order to reach predetermined removal efficiency, electronics is needed
The beam intensity of bundle exceedes certain threshold value.And electron beam can off-energy and line during penetrating flue gas
Intensity.Therefore, in irradiation direction, the efficiency of fume treatment drastically reduces；
2) flue gas that coal-burning boiler produces must first pass through spray cooling, and heat is not utilized effectively；Further,
Desulfurization and denitration carry out synchronization process in same reactor, it is impossible to realize desulfurization and denitration is in optimal
Reaction and process conditions；
3) during using conditional electronic bundle irradiation desulphurization denitration to process, two evils produced in boiler smoke
English fails to effectively be removed.
In view of this, the present invention provides a kind of desulfurization denitration method that can overcome drawbacks described above and device.
Summary of the invention
In order to solve the problems referred to above and the defect of prior art, the invention provides a kind of flue gas desulfurization and denitrification
Method and device, the method and device can significantly improve the utilization ratio of electron beam during desulphurization denitration, fall
The operating cost of low system for desulfuration and denitration, the dioxin simultaneously produced in boiler or combustion engine flue gas also also can obtain
Effectively removing.
To achieve these goals, a kind of method that the invention provides desulfurizing and denitrifying flue gas by electron beam, including
The following step:
1) the flue gas Water spray that boiler or combustion engine produce is processed, make flue gas cool-down；
2) flue gas after cooling is mixed with ammonia, then irradiate to enter with electron beam irradiation through ultraviolet simultaneously
Row desulphurization denitration.
In a preferred embodiment: the direction that described ultraviolet irradiates is phase with the direction of described electron beam irradiation
To direction.
In a preferred embodiment: described ultraviolet irradiates for ultraviolet relative exposure.
In a preferred embodiment: it is two bundle ultraviolet relative exposures that described ultraviolet irradiates.
In a preferred embodiment: described electron beam irradiation is electron beam relative lamp.
In a preferred embodiment: described electron beam irradiation is two beam electrons bundle relative lamp.
In a preferred embodiment: the irradiation of described ultraviolet and electron beam irradiation carry out the reaction temperature of desulphurization denitration
Degree is for 60-100 DEG C.
In a preferred embodiment: the ultraviolet that described ultraviolet irradiates for wavelength is 100-400nm irradiates.
In a preferred embodiment: the mode that described Water spray processes is atomizing spray.
In a preferred embodiment: described Water spray is hydrogen peroxide spray.
The present invention also provides for the device of a kind of desulfurizing and denitrifying flue gas by electron beam, including:
Fume treatment tower, described fume treatment tower is provided with spray system；Described boiler or the flue gas of combustion engine
Outlet is connected by the first flue with the smoke inlet of described fume treatment tower, the flue gas of described fume treatment tower
Exporting and connect irradiation reaction device by the second flue, described second flue is provided with spray ammonia control valve；
Irradiation reaction device, this irradiation reaction device is provided with electron accelerator and ultraviolet generater.
In a preferred embodiment: described electron accelerator and described ultraviolet generater are separately positioned on described
The sidewall locations that irradiation reaction device is relative.
In a preferred embodiment: described electron accelerator is a pair, it is separately positioned on described irradiation reaction device
On relative sidewall.
In a preferred embodiment: described ultraviolet generater is a pair, it is separately positioned on described irradiation reaction
The sidewall locations that device is relative.
In a preferred embodiment: the bottom angled of described irradiation reaction device, at the lowest part of reactor bottom
Byproduct discharge is set.
In a preferred embodiment: the port of export auxiliary connection product collector of described irradiation reaction device.
In a preferred embodiment: described spray system is atomizing sprinkling system.
In a preferred embodiment: described spray system is water injection system or the system of spray hydrogen peroxide.
The present invention also provides for the device using above-mentioned various flue gas desulfurization and denitrifications for processing boiler or combustion engine
The purposes of flue gas.This purposes may be used for removing SOx, the NOx in boiler or combustion engine flue gas and two evils simultaneously
English.
The flue gas that boiler or combustion engine produce is carried out one by fume treatment tower and irradiation reaction device by the present invention respectively
Step desulphurization denitration processes.
Flue gas first passes through Water spray after boiler or combustion engine are discharged and reduces temperature, then entrance after mix with ammonia
Fume treatment tower.The consumption of ammonia can draw according to stoichiometric amount.Water is from the top spray of fume treatment tower
Under and, carry out being fully contacted mixing with the gaseous mixture of flue gas and ammonia.
The water smoke using the method ejection of atomizing spray is in hgher efficiency with what the gaseous mixture of flue gas and ammonia contacted,
Because the size droplet diameter that spraying produces is less, reaction table area is bigger, the more conducively generation of chemical reaction.?
The water of ejection changes into during above-mentioned spray hydrogen peroxide solution then can be obviously improved at first time desulphurization denitration
The removal efficiency of reason, this is because SOx and NOX oxidation can be H by hydrogen peroxide respectively2SO4And HNO3, then with
Ammonia combines and i.e. generates ammonium sulfate and ammonium nitrate, it is achieved desulphurization denitration.
Flue gas temperature after Water spray reaches 60-110 DEG C, then is blended in irradiation reaction device with ammonia
Row desulfurization and denitration reaction.Research mechanism according to relevant desulphurization reaction shows, desulphurization reaction mainly relies on
Thermal chemical reaction.Desulphurization reaction principle is: the SOx in flue gas, O2, H2O and ammonia react generation sulphur
Acid ammonium.In irradiation reaction device, N contained in flue gas2、O2、H2O and CO2Deng gas molecule through electronics
After bundle irradiation, it is converted into substantial amounts of OH, O, HO2Deng oxyradical, in these free radicals and flue gas
SOx and NOx occurs oxidation reaction to generate H at a terrific speed2SO4And HNO3(see document:
Electron-beam flue-gas treatment for multicomponent air-pollution
Control, Applied Energy 75 (2003) 145 154).Produced vaporific H2SO4And HNO3
With NH3Reaction generates sulfate of ammoniac and the ammonium nitrate of white powder.The research mechanism of relevant denitration reaction shows,
Electron beam irradiation reaction is bigger to the influencing factor of denitration reaction.The Main Function of irradiation reaction device middle-ultraviolet lamp
It is: ultraviolet can be by O2And H2O is cracked to form OH free radical and O3, such that it is able to reduce the use of electron beam
Amount, improves economy.The reaction mechanism of action of ultraviolet radiation is as follows:
H2O+hν→H+·OH
O2+hν→O(1D)+O(3P)
O(1D)+M→O(3P)+M (M=O2Or N2)
O(3P)+O2+M→O3+M
O3+hν→O(1D)+O2
O(1D)+H2O→2·OH
Technical scheme in the present invention utilizes ultraviolet and electron beam mixed flue gas to be carried out irradiation not simultaneously
Simple combination.Electron beam and ultraviolet irradiation can produce the free radical of numerous species, including H, OH, H2O2、
H3O、HO3、O3Deng.These free radicals effect during nitrogen oxides is different, and oxidisability is more
Strong radical pair sulfur dioxide and the oxidation effectiveness of nitrogen oxides are the best, get over the action effect of desulphurization denitration
Significantly.Utilizing ultraviolet and electron beam mixed flue gas to be carried out irradiation, its synergy is: ultraviolet simultaneously
The H that electron beam can be produced by line2O2It is further converted to the OH useful to desulphurization denitration Deng free radical.And
The cost of ultraviolet irradiation device is well below electron accelerator, thus is ensureing while desulfurization off sulfide effect,
Effectively reduce equipment cost and operating cost.
H2O2, free radical that the oxidisability such as OH is the strongest make NOx, SO2The most oxidized, change into solid-state
Ammonium nitrate and ammonium sulfate material.In irradiation reaction device, the reaction temperature of desulphurization denitration controls at 60-110 DEG C, should
Temperature range can reach preferably SOx and NOx removal rate.
In above-mentioned mechanism, the also quilt under the double action of electron beam and ultraviolet of the dioxin in flue gas
Oxidation Decomposition, thus reach flue gas removes simultaneously the technique effect of dioxin.Except above-mentioned hydroxyl free radical,
Dioxin is produced outside oxidation by oxygen atom, ozone etc., and electron beam also can be the most mutual with dioxin molecule
Effect, transforms into excited state molecule by dioxin molecule, when excited state molecule energy is more than chemistry bond energy,
May result in the fracture of chemical bond, occur the rearrangement of dioxin molecular structure or dislocation to be decomposed and removed.Purple
The irradiation of outside line then can be converted into excited state and produce significant facilitation dioxin molecule.
The beneficial effects of the present invention is:
Flue gas is directly reached the preferable removing of SOx and NOx after Water spray by methods and apparatus of the present invention
Temperature, in the case of without providing extra heating, can carry out desulfurization and denitration reaction simultaneously, simplify
Technological process, decreases equipment and runs input.It is easy to get owing to ultraviolet generater is relatively inexpensive, so
Irradiation reaction device increases ultraviolet generater and can reduce the power requirement of electron beam generating apparatus further, from
And investment and the operating cost of electron beam generating apparatus can be significantly reduced.Additionally, it is electric in irradiation reaction device
Under the double action of son bundle and ultraviolet, the dioxin in flue gas is the most easily decomposed removing.The method of the present invention
Various boiler is can be widely applied to (such as: coal-burning boiler, garbage burning boiler, chemical industry incineration of waste with device
Boiler etc.) or the process of combustion engine (such as: diesel engine, gas turbine etc.) flue gas.
Accompanying drawing explanation
Fig. 1 is the structural representation of the desulfurizing and denitrifying flue gas by electron beam device of prior art；
Fig. 2 is the structural representation of the flue gas desulfurization and denitrification device of the embodiment of the present invention 1；
Fig. 3 is bowing of the electron accelerator in the irradiation reaction device of the embodiment of the present invention 1 and ultraviolet generater
Relative position view depending on visual angle；
Fig. 4 is the structural representation of the flue gas desulfurization and denitrification device of the embodiment of the present invention 2；
Fig. 5 is the structural representation of the flue gas desulfurization and denitrification device of the embodiment of the present invention 3；
Fig. 6 is electron accelerator and the ultraviolet at visual angle, irradiation reaction device longitudinal cross-section in the embodiment of the present invention 3
The relative position view of generator；
Fig. 7 is the structural representation of the flue gas desulfurization and denitrification device of the embodiment of the present invention 4.
Detailed description of the invention
Embodiment 1
Seeing Fig. 2, flue gas is processed by the present invention respectively by fume treatment tower and irradiation reaction device.Pot
The flue-gas temperature that stove 1 produces is 130 DEG C, SO in flue gasxContent is 300ppm, and NOx content is 200ppm.
The each assembly of desulfurizing and denitrifying flue gas by electron beam device shown in Fig. 2 and annexation are as follows:
Boiler 1 is connected with fume treatment tower 3 by the first flue 2；
Fume treatment tower 3, described fume treatment tower 3 is provided with spray system 4；Fume treatment tower 3
Exhanst gas outlet connects irradiation reaction device 7 with the second flue 5, and described second flue 5 is provided with spray ammonia control valve
6；Electron accelerator 8 is installed on described irradiation reaction device 7, irradiation reaction device 7 sidewall is installed ultraviolet and sends out
Raw device 9.
Flue gas first passes through the first flue 2 after boiler 1 is discharged and enters fume treatment tower 3, is sprayed by control
System 4 water spray reduces makes the temperature of flue gas in fume treatment tower 3；By controlling the nozzle bore of spray system 4
Control the atomizing effect of shower water.Shower water by spray system 4 from the top spray of fume treatment tower 3
Under, it is fully contacted with the gaseous mixture of flue gas and ammonia.The gaseous mixture of steam and flue gas enters back into the second cigarette
Road 5 enters irradiation reaction device 7 after mixing with the ammonia controlling flow through overspray ammonia control valve 6.The consumption of ammonia
Can draw according to stoichiometric amount.
The water smoke using the method ejection of atomizing spray is in hgher efficiency with what the gaseous mixture of flue gas and ammonia contacted,
It is more conducive to the generation of chemical reaction.If changing the water that spray system 4 sprays into dioxygen during above-mentioned spray
The aqueous solution then can be obviously improved first step desulphurization denitration process efficiency, this is because hydrogen peroxide can respectively by
SOx and NOX oxidation are H2SO4And HNO3, more i.e. generation ammonium sulfate and ammonium nitrate is combined with ammonia.
Under conditions of with water for spray agent, SOx, NOx, ammonia, steam and other smoke components group
Mixed gas the second flue 5 together become enters irradiation reaction device 7, carries out synchronized desulfuring and denitrifying process.Irradiation
Reaction temperature in reaction 7 is 60 DEG C.NOx and SOx under the irradiation of the electron beam of electron accelerator 8 generation
Chemical reaction is occurred to be removed.While electron beam irradiation, ultraviolet generater 9 (uviol lamp) produces
Ultraviolet irradiates flue gas, remarkably promotes NOx and SOx and is converted into ammonium nitrate and sulfuric acid through electron beam irradiation reaction
Ammonium.The dioxin contained in flue gas in irradiation reaction device 7 under the dual irradiation of electron beam and ultraviolet also by
Decompose removing.
Accessory substance ammonium nitrate and ammonium sulfate are discharged from the bottom 10 of irradiation reaction device 7, and as fertilizer application.
Flue gas after irradiation reaction device 7 processes is entered in air by chimney 11.
Electron accelerator 8 and ultraviolet generater 9 can be arranged on the inner wall position of irradiation reaction device 7
On, there is the permutation and combination method (such as: horizontal direction irradiation and/or vertical direction irradiation) of multiple position, all
Flue gas can be produced certain irradiation effect.In the present embodiment, the electron accelerator in irradiation reaction device 7
8 and ultraviolet generater 9 be set in horizontal direction to irradiate (as shown in Figure 3).So can increase
Add the overlapping region of electron beam and ultraviolet, be conducive to more fully irradiation flue gas.Set electron-beam dose
For 3kGy, the ultraviolet wavelength that UV emitter produces is 300nm, and power is 20W, sulfur dioxide and nitrogen
The removing index of oxide is respectively up to 94% and 79%.If using instead double in first step desulphurization denitration processes
Oxygen water is spray agent, then the removing index of sulfur dioxide and nitrogen oxides can be promoted to 94% He the most respectively
82%.According to prior art, the removing index of sulfur dioxide and nitrogen oxides is only 70% at identical conditions
With 42%.
Embodiment 2
Seeing Fig. 4, flue gas is processed by the present invention respectively by fume treatment tower and irradiation reaction device.Pot
The flue-gas temperature that stove 1 produces is 150 DEG C, and in flue gas, SOx content is 280ppm, and NOx content is 200ppm.
The each assembly of flue gas desulfurization and denitrification device shown in Fig. 4 and annexation are as follows:
Boiler 1 connects fume treatment tower 3 by the first flue 2；Fume treatment tower 3, described fume treatment
Spray system 4 is installed on tower 3；The exhanst gas outlet of described fume treatment tower 3 is connected by the second flue 5
The arrival end of irradiation reaction device 7；Described second flue 5 is provided with spray ammonia control valve 6；Described irradiation reaction
The port of export of device 7 connects accessory substance collector 11；Described irradiation reaction device 7 electron accelerator installed above
8, ultraviolet generater 9, electron accelerator 8 and ultraviolet generater are installed below described irradiation reaction device 7
9 are arranged oppositely.
Flue gas first passes through the first flue 2 after boiler 1 is discharged and enters fume treatment tower 3 and reduce temperature.Pass through
Control spray system 4 makes the temperature in fume treatment tower 3 at about 80 DEG C；By controlling the spray of spray system 4
The atomizing effect of mouth pore size control shower water.Shower water is sprayed from the top of fume treatment tower 3 by spray system 4
Drench and under, carry out being fully contacted mixing with flue gas.Mixed flue gas enters back into the second flue 5 and through overspray ammonia control
Valve 6 processed control flow ammonia mixing after enter irradiation reaction device 7.The consumption of ammonia can be according to stoichiometric amount
Draw.
The water smoke using the method ejection of atomizing spray is bigger with the contact surface area of smoke contacts, is more beneficial for
The generation of chemical reaction.SOx, NOx and ammonia, steam and the mixed gas of other smoke components composition
Discharge fume treatment tower 5 together, enter back into irradiation reaction device 7, carry out synchronized desulfuring and denitrifying process.Flue gas exists
Reaction temperature in irradiation reaction 7 is 80 DEG C.Electron accelerator 8 produce electron beam irradiation under NOx and
SOx occurs chemical reaction to be removed.While electron beam irradiation, ultraviolet generater 9 (uviol lamp) produces
Raw ultraviolet irradiates flue gas, remarkably promotes NOx and SOx and is converted into ammonium nitrate and sulphur through electron beam irradiation reaction
Acid ammonium.The dioxin contained in flue gas in irradiation reaction device 7 under the dual irradiation of electron beam and ultraviolet also
Be decomposed removing.
Accessory substance collector 10 collects byproduct of reaction ammonium nitrate and ammonium sulfate, and by 11 rows bottom collector
Going out, accessory substance can be as Fertilizer application.Flue gas after accessory substance collector 10 processes is by chimney 12 row
Enter in air.
In the present embodiment, when setting electron-beam dose as 3kGy, the ultraviolet wavelength that UV emitter produces
For 100nm, power is that the removing index of 50W, sulfur dioxide and nitrogen oxides is respectively up to 88% and 90%.
According to prior art, the removing index of sulfur dioxide and nitrogen oxides is only 67% He at identical conditions
21%.
Embodiment 3
Seeing Fig. 5, flue gas is processed by the present invention respectively by fume treatment tower and irradiation reaction device.Pot
The flue-gas temperature that stove 1 produces is 150 DEG C, and in flue gas, SOx content is 280ppm, and NOx content is 200ppm.
The each assembly of flue gas desulfurization and denitrification device shown in Fig. 5 and annexation approximate, specifically in embodiment 2
As follows:
Boiler 1 connects fume treatment tower 3 by the first flue 2；Fume treatment tower 3, described fume treatment
Spray system 4 is installed on tower 3；The exhanst gas outlet of described fume treatment tower 3 is connected by the second flue 5
The arrival end of irradiation reaction device 7；Described second flue 5 is provided with spray ammonia control valve 6；Described irradiation reaction
The port of export of device 7 connects accessory substance collector 11.
Ultraviolet generater in irradiation reaction device 7 is a pair, is separately positioned on the side that irradiation reaction device 7 is relative
Wall position (only indicates a ultraviolet generater 91) in Fig. 5.The electronics installed on irradiation reaction device 7 accelerates
Device 81 and 82 is a pair, is separately positioned on the sidewall that irradiation reaction device 7 is relative.Fig. 6 is spoke in the present embodiment
According to the longitudinal cross-section schematic diagram of reactor 7, electron accelerator 81 and 82 is to being arranged on hanging down of irradiation reaction device 7
Upwards, ultraviolet generater 91 and 92 is in the horizontal direction being arranged on irradiation reaction device 7 for Nogata.Use
Above-mentioned design can make the electron beam in irradiation reaction device and ultraviolet more uniformly spread, it is achieved Electron Beam
Intensity of flow and the electron beam energy that absorbs in flue gas realizes being uniformly distributed in the space of irradiation zone, permissible
It is effectively prevented from the region occurring being difficult to fully react in irradiation reaction device.
Flue gas first passes through the first flue 2 after boiler 1 is discharged and enters fume treatment tower 3 and reduce temperature.Pass through
Control spray system 4 makes the temperature in fume treatment tower 3 reach about 110 DEG C；By controlling spray system 4
Nozzle bore controls the atomizing effect of shower water.Shower water passes through spray system 4 from the top of fume treatment tower 3
Spray and under, carry out being fully contacted mixing with flue gas.Mixed flue gas enters back into the second flue 5 and through overspray ammonia
Control valve 6 control flow ammonia mixing after enter irradiation reaction device 7.The consumption of ammonia can be according to Chemical Calculation
Measure out.
The water smoke using the method ejection of atomizing spray is bigger with the contact surface area of smoke contacts, is more beneficial for
The generation of chemical reaction.SOx, NOx and ammonia, steam and the mixed gas of other smoke components composition
Discharge fume treatment tower 3 together, enter back into irradiation reaction device 7, carry out synchronized desulfuring and denitrifying process.Flue gas mixes
Closing gas reaction temperature in irradiation reaction 7 is 100 DEG C.In the present embodiment, realize in irradiation reaction device 7
Electron beam and ultraviolet irradiation flue gas simultaneously.It is two bundle ultraviolet relative exposures that ultraviolet irradiates, electron beam spoke
According to for two beam electrons bundle relative lamp.Electron accelerator 81 and 82 produce electron beam irradiation under NOx and
Raw ultraviolet irradiates flue gas, remarkably promotes NOx and SOx and is converted into ammonium nitrate and sulphur through electron beam irradiation reaction
Acid ammonium.The dioxin contained in flue gas in irradiation reaction device 7 under the dual irradiation of electron beam and ultraviolet also
Be decomposed removing.Owing to eliminating reaction dead angle, the removal efficiency of NOx, SOx and dioxin is all carried
Rise.
Accessory substance collector 10 collects byproduct of reaction ammonium nitrate and ammonium sulfate, and by 11 rows bottom collector
Going out, accessory substance can be as Fertilizer application.Flue gas after accessory substance collector 10 processes is by chimney 12 row
Enter in air.
In the present embodiment, when setting electron-beam dose as 3kGy, the ultraviolet wavelength that UV emitter produces
For 400nm, power is that the removing index of 40W, sulfur dioxide and nitrogen oxides is respectively up to 90% and 92%.
According to prior art, the removing index of sulfur dioxide and nitrogen oxides is only 67% He at identical conditions
21%.
Embodiment 4
Seeing Fig. 7, flue gas is processed by the present invention respectively by fume treatment tower and irradiation reaction device.Combustion
The flue-gas temperature of gas turbine 1 generation burning natural gas is 350 DEG C, and in flue gas, NOx content is 180ppm.
The each assembly of flue gas desulfurization and denitrification device shown in Fig. 7 and annexation approximate, specifically in embodiment 2
As follows:
The gas turbine 1 of burning natural gas connects fume treatment tower 3 by the first flue 2；Fume treatment tower
3, described fume treatment tower 3 is provided with spray system 4；The exhanst gas outlet of described fume treatment tower 3 passes through
Second flue 5 connects the arrival end of irradiation reaction device 7；Described second flue 5 is provided with spray ammonia control valve 6；
The port of export of described irradiation reaction device 7 connects accessory substance collector 11.
Ultraviolet generater in irradiation reaction device 7 is a pair, is separately positioned on the side that irradiation reaction device 7 is relative
Wall position (only indicates one of them ultraviolet generater 91) in Fig. 7.The electricity installed on irradiation reaction device 7
Sub-accelerator 81 and 82 is a pair, is separately positioned on the sidewall that irradiation reaction device 7 is relative.
Flue gas first passes through the first flue 2 after the gas turbine 1 of burning natural gas is discharged and enters fume treatment
Tower 3 reduces temperature.The temperature in fume treatment tower 3 is made to reach about 100 DEG C by control spray system 4；Logical
Cross the atomizing effect of the nozzle bore control shower water controlling spray system 4.Shower water by spray system 4 from
The top spray of fume treatment tower 3 and under, carry out being fully contacted mixing with flue gas.Mixed flue gas enters back into
Two flues 5 enter irradiation reaction device 7 after mixing with the ammonia controlling flow through overspray ammonia control valve 6.Ammonia
Consumption can draw according to stoichiometric amount.
The water smoke using the method ejection of atomizing spray is bigger with the contact surface area of smoke contacts, is more beneficial for
The generation of chemical reaction.Together with the mixed gas that NOx forms with ammonia, steam and other smoke components
Discharge fume treatment tower 3, enter back into irradiation reaction device 7, carry out synchronizing denitration and process.Flue gas mixed gas exists
Reaction temperature in irradiation reaction 7 is 100 DEG C.In the present embodiment, realize in irradiation reaction device 7 electron beam and
Ultraviolet irradiation flue gas simultaneously.It is two bundle ultraviolet relative exposures that ultraviolet irradiates, and electron beam irradiation is two bundles
Electron beam relative lamp.Under the irradiation of the electron beam of electron accelerator 81 and 82 generation, NOx occurs chemistry anti-
Should be removed.While electron beam irradiation, ultraviolet generater 91 and 92 produces ultraviolet and irradiates flue gas,
Remarkably promote NOx and be converted into ammonium nitrate through electron beam irradiation reaction.
Byproduct of reaction ammonium nitrate collected by accessory substance collector 10, and discharges by bottom collector 11, by-product
Thing can be as Fertilizer application.Flue gas after accessory substance collector 10 processes enters air by chimney 12
In.
In the present embodiment, when setting electron-beam dose as 3kGy, the ultraviolet wavelength that UV emitter produces
For 200nm, power is 40W, and the removing index of nitrogen oxides is up to 92%.According to prior art, identical
Under conditions of the removing index of nitrogen oxides be only 28%.
For purposes of illustration, foregoing description is given by reference to specific embodiment.But, above-mentioned example
Property discuss and be not intended to exhaustive limit the invention to exact form disclosed.In view of above-mentioned teaching, permissible
There are many modifications and variations.Selecting and describing these embodiments is the principle in order to preferably explain the present invention
And reality application, thus enable others skilled in the art utilize the present invention best and be suitable for
Each embodiment and various amendment in the particular use conceived.
Claims (19)
1. the method for a flue gas desulfurization and denitrification, it is characterised in that comprise the following steps:
1) the flue gas Water spray that boiler or combustion engine produce is processed, make flue gas cool-down；
2) flue gas after cooling is mixed with ammonia, then irradiate and electron beam spoke through ultraviolet simultaneously
Shine into row desulphurization denitration.
The method of a kind of flue gas desulfurization and denitrification the most according to claim 1, it is characterised in that:
The direction that described ultraviolet irradiates is relative direction with the direction of described electron beam irradiation.
The method of a kind of flue gas desulfurization and denitrification the most according to claim 1, it is characterised in that:
Described ultraviolet irradiates for ultraviolet relative exposure.
The method of a kind of flue gas desulfurization and denitrification the most according to claim 3, it is characterised in that:
It is two bundle ultraviolet relative exposures that described ultraviolet irradiates.
The method of a kind of flue gas desulfurization and denitrification the most according to claim 1, it is characterised in that:
Described electron beam irradiation is electron beam relative lamp.
The method of a kind of flue gas desulfurization and denitrification the most according to claim 5, it is characterised in that:
Described electron beam irradiation is two beam electrons bundle relative lamp.
The method of flue gas desulfurization and denitrification the most as claimed in any of claims 1 to 6, its
It is characterised by: the irradiation of described ultraviolet and electron beam irradiation carry out the reaction temperature of desulphurization denitration and be
60-110℃。
The method of flue gas desulfurization and denitrification the most as claimed in any of claims 1 to 6, its
It is characterised by: the ultraviolet that described ultraviolet irradiates for wavelength is 100-400nm irradiates.
The method of flue gas desulfurization and denitrification the most as claimed in any of claims 1 to 6, its
It is characterised by: the mode that described Water spray processes is atomizing spray.
The method of a kind of flue gas desulfurization and denitrification the most according to claim 9, it is characterised in that:
Described Water spray is hydrogen peroxide spray.
The device of 11. 1 kinds of flue gas desulfurization and denitrifications, it is characterised in that including:
Fume treatment tower, described fume treatment tower is provided with spray system；Described boiler or combustion engine
Exhanst gas outlet is connected by the first flue with the smoke inlet of described fume treatment tower, described fume treatment
The exhanst gas outlet of tower connects irradiation reaction device by the second flue, and described second flue is provided with spray ammonia control
Valve processed；
Irradiation reaction device, this irradiation reaction device is provided with electron accelerator and ultraviolet generater.
The device of 12. flue gas desulfurization and denitrifications according to claim 11, it is characterised in that: institute
State electron accelerator and be separately positioned on the side that described irradiation reaction device is relative with described ultraviolet generater
Wall position.
The device of 13. a kind of flue gas desulfurization and denitrifications according to claim 11, it is characterised in that:
Described electron accelerator is a pair, is separately positioned on the sidewall that described irradiation reaction device is relative.
The device of 14. a kind of flue gas desulfurization and denitrifications according to claim 11, it is characterised in that:
Described ultraviolet generater is a pair, is separately positioned on the sidewall locations that described irradiation reaction device is relative.
15. according to the device of the flue gas desulfurization and denitrification that any one is described in claim 11 to 14,
It is characterized in that: the bottom angled of described irradiation reaction device, the lowest part at reactor bottom arranges pair
Product exit.
16. according to the device of the flue gas desulfurization and denitrification that any one is described in claim 11 to 14,
It is characterized in that: the port of export auxiliary connection product collector of described irradiation reaction device.
17. according to the device of the flue gas desulfurization and denitrification that any one is described in claim 11 to 14,
It is characterized in that: described spray system is atomizing sprinkling system.
The device of 18. a kind of flue gas desulfurization and denitrifications according to claim 17, it is characterised in that:
Described spray system is water injection system or the system of spray hydrogen peroxide.
19. 1 kinds of devices by the flue gas desulfurization and denitrification described in any one in claim 11 to 18
For processing the purposes of boiler or combustion engine flue gas.
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| CN105521695B (en) * | 2016-01-11 | 2018-04-03 | 邱博 | A kind of industrial refuse cracking incineration tail gas denitrating system |
| CN106178863A (en) * | 2016-08-16 | 2016-12-07 | 胡安平 | A kind of desulfurization denitration method of boiler smoke |
| CN109499326A (en) * | 2018-12-13 | 2019-03-22 | 江苏菲达环保科技有限公司 | A kind of method of flue gas desulfurization and denitrification |
| CN110566989A (en) * | 2019-10-18 | 2019-12-13 | 佛山丰汇环保工程有限公司 | Environment-friendly flue gas denitration device |
| CN110947287A (en) * | 2019-12-13 | 2020-04-03 | 西安润川环保科技有限公司 | Flue gas desulfurization and denitrification method |
| CN114849434B (en) * | 2022-05-09 | 2023-06-16 | 福建龙净环保股份有限公司 | Prilling tower system and tail gas treatment device |
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