CN109876618A - A kind of flue gas pollutant removal system and method - Google Patents
A kind of flue gas pollutant removal system and method Download PDFInfo
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- CN109876618A CN109876618A CN201910288868.9A CN201910288868A CN109876618A CN 109876618 A CN109876618 A CN 109876618A CN 201910288868 A CN201910288868 A CN 201910288868A CN 109876618 A CN109876618 A CN 109876618A
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- flue gas
- gas
- ozone
- alcohols
- flue
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- 239000003546 flue gas Substances 0.000 title claims abstract description 204
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 174
- 238000000034 method Methods 0.000 title claims abstract description 70
- 239000003344 environmental pollutant Substances 0.000 title claims abstract description 29
- 231100000719 pollutant Toxicity 0.000 title claims abstract description 29
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims abstract description 97
- 239000007789 gas Substances 0.000 claims abstract description 76
- 238000002156 mixing Methods 0.000 claims abstract description 69
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 52
- 238000005200 wet scrubbing Methods 0.000 claims abstract description 52
- 230000003647 oxidation Effects 0.000 claims abstract description 47
- 238000002347 injection Methods 0.000 claims abstract description 42
- 239000007924 injection Substances 0.000 claims abstract description 42
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 27
- 239000013618 particulate matter Substances 0.000 claims abstract description 21
- 150000002828 nitro derivatives Chemical class 0.000 claims abstract description 18
- -1 Nitro compound Chemical class 0.000 claims abstract description 9
- 238000000746 purification Methods 0.000 claims abstract description 8
- 239000000243 solution Substances 0.000 claims description 89
- 150000001298 alcohols Chemical class 0.000 claims description 50
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 48
- 238000005406 washing Methods 0.000 claims description 33
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 18
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 15
- 238000000889 atomisation Methods 0.000 claims description 12
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 9
- 239000001301 oxygen Substances 0.000 claims description 9
- 229910052760 oxygen Inorganic materials 0.000 claims description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 8
- 238000005842 biochemical reaction Methods 0.000 claims description 7
- 239000000779 smoke Substances 0.000 claims description 7
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 claims description 6
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims description 6
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 6
- 239000012670 alkaline solution Substances 0.000 claims description 6
- 230000005587 bubbling Effects 0.000 claims description 6
- 229910001882 dioxygen Inorganic materials 0.000 claims description 6
- 239000000945 filler Substances 0.000 claims description 6
- 239000007921 spray Substances 0.000 claims description 6
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 claims description 5
- 239000003513 alkali Substances 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 claims description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims 1
- 229910052708 sodium Inorganic materials 0.000 claims 1
- 239000011734 sodium Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 8
- HEMHJVSKTPXQMS-UHFFFAOYSA-M sodium hydroxide Inorganic materials [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 17
- 238000005516 engineering process Methods 0.000 description 15
- 239000003517 fume Substances 0.000 description 6
- 238000011282 treatment Methods 0.000 description 6
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 239000007800 oxidant agent Substances 0.000 description 3
- 230000001590 oxidative effect Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 239000005864 Sulphur Substances 0.000 description 2
- 239000000809 air pollutant Substances 0.000 description 2
- 231100001243 air pollutant Toxicity 0.000 description 2
- 235000019504 cigarettes Nutrition 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 238000009279 wet oxidation reaction Methods 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 238000009303 advanced oxidation process reaction Methods 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 210000002345 respiratory system Anatomy 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Landscapes
- Treating Waste Gases (AREA)
Abstract
The invention discloses a kind of flue gas pollutants to remove system and method, for removing gas component NO from flue gas to be processedx、SOx, multiple pollutants, the system such as particulate matter include: Flue Gas Pretreatment Device, be located at the arrival end of flue gas to be processed, for the temperature of flue gas to be processed to be down to 150 DEG C or less；Gas mixing oxidation panel, between Flue Gas Pretreatment Device and wet scrubbing device, being mainly used for will be through the NO of Flue Gas Pretreatment Device treated flue gas middle or low price statexIt is converted into the NO of high-valence statexNitro compound soluble easily in water and wet scrubbing device with other are located at the outlet end of flue gas after purification, are mainly used for carrying out wet scrubbing to through gas mixing oxidation panel treated flue gas, absorb SO in removal flue gasx, particulate matter, high-valence state NOxAnd other nitro compounds soluble easily in water.The present invention can be in injection of ozone mole and NO in flue gasxThe ratio between mole is not more than under conditions of 1, obtains very good denitration effect.
Description
Technical field
The present invention relates to one kind to remove gas component NO from flue gasx、SOx, the multiple pollutants such as particulate matter system and side
Method.More particularly it relates to a kind of system and a kind of method, the system and method are assisted by ozone and alcohols gas
Together, selectively by the NO of flue gas middle or low price statexIt is converted into the NO of high-valence statexAnd other nitro compounds soluble easily in water, then
Through the comprehensive removal NO of wet scrubbingx、SOx, the multiple pollutants such as particulate matter.
Background technique
Combustion of fossil fuel generates the NO in flue gasxIt is one of Air Pollutants.NOxNitric acid can be formed in an atmosphere
Type acid rain and photochemical fog can also cause serious damage to the respiratory system of human body and animal.Therefore, for NOxPollution
Object emission problem, environment department, various countries have formulated stringent air pollution emission standard.On May 16th, 2014, Environmental Protection in China
" emission standard of air pollutants for boilers " is formulated, it is specified that from July 1st, 2014, in the flue gas that new construction of coal-fired boiler generates in portion
NOxContent be no more than 300mg/m3.To be further reduced NOxDischarge, area in all parts of the country has put into effect more stringent ground successively
Square standard." boiler pollutant discharge standard " has been issued, it is specified that from the year two thousand twenty January 1 on June 7th, 2018, Shanghai City, on
NO in the flue gas that fuel gas boiler combustion generates within the scope of sea marketxContent be no more than 50mg/m3.In order to meet people to NOx
Minimum discharge requirement, needs to develop efficient denitrating flue gas new technology, new process.
Currently, people use flue gas depth denitration technology mainly include low-temperature SCR technology, wet oxidation washing technology,
Ozone high grade oxidation technology etc..Wherein the catalyst in low-temperature SCR technology is in extensive research and development and pilot stage.Wet process oxygen
The denitration effect for changing washing technology is preferable, but needs to consume a large amount of oxidant during wet scrubbing.Oxidant it is high at
Originally the large-scale application of wet oxidation washing technology is greatly limited.Ozone high grade oxidation technology is using Strong oxdiative
The ozone of property, by being passed through a large amount of ozone into flue gas, will be insoluble in the NO of water as denitration oxidant in flue gasxIt is oxidized to
N soluble easily in water2O5, then removal is absorbed by way of lye wet scrubbing.The technique has oxidation efficiency height, without two
The advantages that secondary pollution, therefore, the technology has obtained more and more applications in terms of flue gas depth denitration in recent years.
Patent CN1923337A disclose a kind of ozone oxidation and meanwhile remove in boiler smoke the device of multiple pollutant and
Method.Its device is mainly made of ozone generating-device, alkali liquid washing tower, mercury stabilizer adding set and corresponding flue.The party
Method first uses ozone that NO is oxidized to NO2、N2O5Etc. high-valence states nitrogen oxides, then pass through wet scrubbing absorb flue gas in NOx、
SOx, the multiple pollutants such as Hg, HCl.Injection of ozone mole and NO in flue gas in the methodxThe ratio between mole is 1.1-2.0.
Patent CN104941410A discloses a kind of ozone two-step oxidation flue gas sulphur nitre integration removal methods and device.Its
Device is mainly made of ozone generating-device, wet scrubbing tower, nitrogen element sulphur recyclable device and corresponding flue.This method is first by portion
Divide ozone to inject from flue reactor leading portion, NO in flue gas is oxidized to NO2.Residual ozone is injected from flue reactor end,
Further by NO in flue gas2It is oxidized to NO3Or N2O5.Again by wet scrubbing to realize simultaneous SO_2 and NO removal.In the method
NO in injection of ozone mole and flue gasxThe ratio between mole is 1.2-2.5.
Although the NO in flue gas can be efficiently oxidized to by the existing fume treatment technology based on ozone high grade oxidation method
The NO of high-valence state3Or N2O5, then pass through the modes such as wet scrubbing while removing NO in flue gasx、SOx, the multiple pollutants such as particulate matter,
But NO in injection of ozone mole and flue gasxRatio it is usually higher.Since the generation process of ozone needs to consume a large amount of electricity
Can, this will lead to the existing flue gas treating process based on ozone high grade oxidation method equipment investment and in terms of
Cost is excessively high, limits the large-scale commercial application of related process.Therefore, how in the premise for guaranteeing fume treatment effect
Under, effectively reduce injection of ozone mole and NO in flue gas during fume treatmentxThe ratio of mole is promoted based on ozone
The critical issue of the fume treatment technical industryization application of advanced oxidation processes.
Summary of the invention
For NO in injection of ozone mole in the existing flue gas treating process based on ozone high grade oxidation method and flue gasx
Mole ratio is higher, and then the problem for causing process costs excessively high.The present invention provides a kind of flue gas pollutants to remove system
And method, the present invention can be in institute's injection of ozone moles and NO in flue gasxIn the case that the ratio between mole is not more than 1, obtain
The effect of very good simultaneous SO_2 and NO removal degranulation object is conducive to save a large amount of electric energy, reduces cost of investment and operation
Cost.The technological means that the present invention uses is as follows:
A kind of flue gas pollutant removal system, for removing gas component NO from flue gas to be processedx、SOx, particulate matter etc.
Multiple pollutant, comprising:
Flue Gas Pretreatment Device is located at the arrival end of flue gas to be processed, for the temperature of flue gas to be processed to be down to 150
DEG C or less；Since a large amount of selfdecompositions can occur when flue-gas temperature is higher for ozone, the present invention proposes to pre-process using flue gas
Device controls flue-gas temperature to be processed at 150 DEG C hereinafter, to improve the utilization rate of ozone.
Gas mixing oxidation panel, between Flue Gas Pretreatment Device and wet scrubbing device, being mainly used for will be through cigarette
The NO of gas pretreatment unit treated flue gas middle or low price statexIt is converted into the NO of high-valence statexNitro compound soluble easily in water with other
Object, the gas mixing oxidation panel is made of the alcohols mixing section and ozone mixing section being sequentially communicated or is whole flue, if institute
It states gas mixing oxidation panel to be made of the alcohols mixing section and ozone mixing section being sequentially communicated, then the alcohols mixing section is equipped with
To the alcohols injection device of its atomization injection alcohol solution, the ozone mixing section is equipped with the ozone of injection of ozone into it
Generating device (alcohol solution is injected before ozone)；If the gas mixing oxidation panel is whole flue, which is provided with to whole
Body flue it is atomization injection alcohol solution alcohols injection device and into whole flue injection of ozone ozone generating-device (alcohol
Class solution and ozone are injected in same position)；
And the wet scrubbing device, it is located at the outlet end of flue gas after purification, is mainly used for through gas mixing oxygen
Change section treated flue gas and carry out wet scrubbing, absorbs SO in removal flue gasx, particulate matter, high-valence state NOxAnd other are readily soluble
In the nitro compound of water.
The alcohols injection device includes: the storage cabinet for containing alcohol solution, for by the alcohol in the storage cabinet
Class solution is injected into the metering pump of the atomizer in gas mixing oxidation panel.Using the alcohol in metering pump conveying storage cabinet
Class solution, after being sufficiently atomized through atomizer, treated that flue gas is mixed with Flue Gas Pretreatment Device.The alcohols is molten
Liquid have good volatility, the heat in flue and quickly volatilize, formed alcohols gas, with Flue Gas Pretreatment Device processing after
Flue gas between be sufficiently mixed.Alcohols mole and NO in mixed flue gas in mixed flue gasxThe ratio between mole exists
Within the scope of 0.3-2.
The working principle of the ozone generating-device includes but is not limited to photochemical method, electrochemical process, corona discharge method etc.；
The working gas of the ozone generating-device include but is not limited to air, oxygen and other containing oxygen gas mixture；
The ozone that the ozone generating-device generates is injected into gas mixing oxidation panel, with Flue Gas Pretreatment Device processing
Flue gas, alcohols gas afterwards is sufficiently mixed concurrent biochemical reaction, selectively by NO in flue gas in gas mixing oxidation panelxTurn
Substance soluble easily in water is turned to, NO in flue gas in injection of ozone mole and gas mixing oxidation panelxThe ratio between mole is not more than
1。
The wet scrubbing device, which is equipped with, to be connected to and for introducing through gas mixing oxidation panel with gas mixing oxidation panel
The smoke inlet of treated flue gas and solution inlet for introducing washing solution, wet scrubbing device upper end, which is equipped with, to be used
The exhanst gas outlet of flue gas after discharge purification, lower end be equipped with for collects wash after the solution that is connected to of device for storing liquid of solution go out
Mouthful.The washing solution includes but is not limited to use the alkali compounds such as sodium hydroxide, potassium hydroxide, carbonate, bicarbonate
One or more of the alkaline solution that is formulated.Enter through gas mixing oxidation panel treated flue gas from smoke inlet wet
Method wash mill, the wet scrubbing device is using bubbling or the wet scrubbings mode such as spray or filler.In the wet scrubbing
Inside device, flue gas comes into full contact with and reacts with washing solution, to remove NO in flue gas compositionx、SOx, particulate matter etc. it is more
Kind pollutant, flue gas is discharged from exhanst gas outlet after purification.According to the present invention, the wet scrubbing device may be configured as open system
With the different forms such as closed system.The term " open system " herein refer to washing solution therein with smoke contacts
It later can discharged system.The term " closed system " herein refers to that washing solution therein is recyclable to receive again
Processing and the system that can constantly recycle.
Distribution device is equipped in the gas mixing oxidation panel, to improve the mixed of flue gas to be processed and alcohols gas and ozone
Close effect.
The invention also discloses a kind of methods for carrying out flue gas pollutant removal using system described above, if the gas
Body mixed oxidization section is made of the alcohols mixing section and ozone mixing section being sequentially communicated, then the method has following steps:
S1, flue gas to be processed control flue-gas temperature at 150 DEG C or less after Flue Gas Pretreatment Device processing；
S2, a certain amount of alcohol solution is injected to gas mixing oxidation panel is atomization, the alcohol solution heat is quickly waved
Send out into alcohols gas, and treated that flue gas is sufficiently mixed with Flue Gas Pretreatment Device, alcohols mole in mixed flue gas
With NO in mixed flue gasxThe ratio between mole is within the scope of 0.3-2；The alcohol solution of injection can absorb heat in volatilization process,
Thus to Flue Gas Pretreatment Device, treated that flue gas has the effect of further cooling down, and the selfdecomposition for helping to reduce ozone is damaged
It loses.
S3, a certain amount of ozone is injected into gas mixing oxidation panel, keep ozone and the flue gas that obtains through step S2 abundant
The biochemical reaction of hybrid concurrency, selectively by the NO of the flue gas middle or low price state obtained through step S2xConvert the NO of high-valence statexWith
NO in other nitro compounds soluble easily in water, injection of ozone mole and the flue gas obtained through step S2xThe ratio between mole is no
Greater than 1；
S4, the flue gas obtained through step S3 is handled by wet scrubbing device, through step inside wet scrubbing device
The flue gas that S3 is obtained comes into full contact with washing solution to react, and the washing solution fully absorbs in the flue gas obtained through step S3
SOx, particulate matter, high-valence state NOxAnd other nitro compounds soluble easily in water.
If it is necessary, the step S1 to S4 in the method may be repeated one or more times.
The alcohol solution includes but is not limited to methanol solution, ethanol solution, normal propyl alcohol solution, aqueous isopropanol.
The concentration of alcohols is within the scope of 1%-100% in the alcohol solution.
The working principle of the ozone generating-device includes but is not limited to photochemical method, electrochemical process, corona discharge method；
The gas source of the ozone generating-device include but is not limited to air, oxygen and other containing oxygen gas mixture.
The washing solution includes but is not limited to use the alkalizations such as sodium hydroxide, potassium hydroxide, carbonate, bicarbonate
Close the alkaline solution that one or more of object is formulated.
The mode of washing of the wet scrubbing device includes but is not limited to bubbling, spray, filler etc..
The invention also discloses a kind of methods for carrying out flue gas pollutant removal using system described above, if the gas
Body mixed oxidization section is whole flue, then the method has following steps:
S1, flue gas to be processed control flue-gas temperature at 150 DEG C or less after Flue Gas Pretreatment Device processing；
S2, a certain amount of ozone and a certain amount of alcohol solution of atomization injection are injected simultaneously into gas mixing oxidation panel,
The alcohol solution heat is quickly volatilized into alcohols gas, alcohols gas, ozone and Flue Gas Pretreatment Device treated flue gas
It is sufficiently mixed concurrent biochemical reaction, selectively by the NO through Flue Gas Pretreatment Device treated flue gas middle or low price statexTurn
Turn to high-valence state NOx and other nitro compounds soluble easily in water, wherein in mixed flue gas alcohols mole with mix
NO in flue gas afterwardsxThe ratio between mole is within the scope of 0.3-2, NO in injection of ozone mole and mixed flue gasxMole it
Than being not more than 1；
S3, the flue gas obtained through step S2 is handled by wet scrubbing device, through step inside wet scrubbing device
The flue gas that S2 is obtained comes into full contact with washing solution to react, and the washing solution fully absorbs in the flue gas obtained through step S2
SOx, particulate matter, high-valence state NOxAnd other nitro compounds soluble easily in water.
If it is necessary, the step S1 to S3 in the method may be repeated one or more times.
The alcohol solution includes but is not limited to methanol solution, ethanol solution, normal propyl alcohol solution, aqueous isopropanol.
The concentration of alcohols is within the scope of 1%-100% in the alcohol solution.
The working principle of the ozone generating-device includes but is not limited to photochemical method, electrochemical process, corona discharge method；
The gas source of the ozone generating-device include but is not limited to air, oxygen and other containing oxygen gas mixture.
The washing solution includes but is not limited to use the alkalizations such as sodium hydroxide, potassium hydroxide, carbonate, bicarbonate
Close the alkaline solution that one or more of object is formulated；
The mode of washing of the wet scrubbing device includes but is not limited to bubbling, spray, filler etc..
Compared with other fume treatment technologies, the invention has the following advantages that
1, in other method of denitration and technique based on ozone high grade oxidation method, in injection of ozone mole and flue gas
NOxThe ratio between mole is generally higher than 2, by the NO of flue gas middle or low price statexIt is oxidized to high-valence state N soluble easily in water2O5.With it is existing
Technology is compared, and the present invention can be in injection of ozone mole and NO in flue gasxThe ratio between mole is not more than under conditions of 1, obtains
Very good denitration effect.The initial stage input cost of equipment can be not only substantially reduced in this way, but also can significantly reduce whole system
Operating cost, to improve the economy and practicability of technique.
2, the present invention using into flue gas simultaneously injection of ozone and alcohols or first inject alcohols after injection of ozone method, choosing
Selecting property by the NO of flue gas middle or low price statexIt is converted into the NO of high-valence statexNitro compound soluble easily in water, substantially reduces with other
The dosage of ozone.It is at low cost in technique, without secondary pollution, improve the practicability of technique.
3, the present invention can be on the basis of NO_x Reduction by Effective, while efficiently removing SO in flue gasx, a variety of pollutions such as particulate matter
Object has good integration and scalability.
The present invention can be widely popularized in fields such as fume treatments based on the above reasons.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to do simply to introduce, it should be apparent that, the accompanying drawings in the following description is this hair
Bright some embodiments for those of ordinary skill in the art without any creative labor, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the structure diagram of flue gas pollutant removal system in the embodiment of the present invention 1.
Fig. 2 is the structure diagram of flue gas pollutant removal system in the embodiment of the present invention 2.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
Embodiment 1
As shown in Figure 1, a kind of flue gas pollutant removes system, for removing gas component NO from flue gas to be processedx、
SOx, the multiple pollutants such as particulate matter, comprising: Flue Gas Pretreatment Device 1 is located at the arrival end of flue gas to be processed, for will be to
The temperature of processing flue gas is down to 150 DEG C or less；Gas mixing oxidation panel, is located at Flue Gas Pretreatment Device 1 and wet scrubbing fills
It sets between 4, being mainly used for will be through the NO of Flue Gas Pretreatment Device treated flue gas middle or low price statexIt is converted into the NO of high-valence statexWith
Other nitro compounds soluble easily in water, the gas mixing oxidation panel are mixed by the alcohols mixing section 2 and ozone being sequentially communicated
Section 3 forms, and the alcohols mixing section 2 is equipped with the alcohols injection device 5 to its atomization injection alcohol solution, the alcohols note
Entering device 5 includes: the storage cabinet for containing alcohol solution, for being injected into the alcohol solution in the storage cabinet positioned at alcohol
The metering pump of atomizer in class mixing section 2, the ozone mixing section 3 are equipped with ozone of injection of ozone into it and fill
Set 6；Distribution device is equipped in the alcohols mixing section 2 and the ozone mixing section 3；And the wet scrubbing device 4, position
The outlet end of flue gas after purification is mainly used for carrying out wet scrubbing to through treated the flue gas of ozone mixing section 3, absorbs removal
SO in flue gasx, particulate matter, high-valence state NOxAnd other nitro compounds soluble easily in water, i.e., the described Flue Gas Pretreatment Device
1, the alcohols mixing section 2, the ozone mixing section 3 and the wet scrubbing device 4 are sequentially communicated；The wet scrubbing device
4 are equipped with and be connected tos with ozone mixing section 3 and be used to introduce smoke inlet through treated the flue gas of ozone mixing section 3 and for drawing
Enter to wash the solution inlet of solution, 4 upper end of wet scrubbing device be equipped with for discharge purify after flue gas exhanst gas outlet, under
End be equipped with for collects wash after solution the taphole that is connected to of device for storing liquid.
A method of flue gas pollutant removal being carried out using system described above, there are following steps:
S1, flue gas to be processed control flue-gas temperature at 150 DEG C or less after the Flue Gas Pretreatment Device 1 processing；
S2, a certain amount of alcohol solution is injected to alcohols mixing section 2 is atomization, the alcohol solution heat is quickly volatilized into
Alcohols gas, and treated that flue gas is sufficiently mixed with Flue Gas Pretreatment Device 1, in mixed flue gas alcohols molar concentration with
NO in mixed flue gasxThe ratio between molar concentration is within the scope of 0.3-2；
S3, a certain amount of ozone is injected into ozone mixing section 3, be sufficiently mixed ozone with the flue gas obtained through step S2
Concurrent biochemical reaction, selectively by the NO of the flue gas middle or low price state obtained through step S2xIt is converted into the NO of high-valence statexAnd its
NO in his nitro compound soluble easily in water, the ozone mole of injection and the flue gas obtained through step S2xThe ratio between mole is no
Greater than 1；
S4, the flue gas obtained through step S3 is handled by wet scrubbing device 4, through step inside wet scrubbing device
The flue gas that S3 is obtained comes into full contact with washing solution to react, and the washing solution fully absorbs in the flue gas obtained through step S3
SOx, particulate matter, high-valence state NOxAnd other nitro compounds soluble easily in water.
The alcohol solution includes but is not limited to methanol solution, ethanol solution, normal propyl alcohol solution, aqueous isopropanol.
The concentration of alcohols is within the scope of 1%-100% in the alcohol solution.
The working principle of the ozone generating-device 6 includes but is not limited to photochemical method, electrochemical process, corona discharge method；
The gas source of the ozone generating-device 6 include but is not limited to air, oxygen and other containing oxygen gas mixture.
The washing solution includes but is not limited to use the alkalizations such as sodium hydroxide, potassium hydroxide, carbonate, bicarbonate
Close the alkaline solution that one or more of object is formulated.
The mode of washing of the wet scrubbing device 4 includes but is not limited to bubbling, spray, filler etc..
Embodiment 2
As shown in Fig. 2, a kind of flue gas pollutant removes system, for removing gas component NO from flue gas to be processedx、
SOx, the multiple pollutants such as particulate matter, comprising: Flue Gas Pretreatment Device 1` is located at the arrival end of flue gas to be processed, for will
The temperature of flue gas to be processed is down to 150 DEG C or less；Gas mixing oxidation panel 2`, is located at Flue Gas Pretreatment Device 1` and wet process is washed
It washs between device 3`, being mainly used for will be through the NO of Flue Gas Pretreatment Device treated flue gas middle or low price statexIt is converted into high-valence state
NOxNitro compound soluble easily in water with other, the gas mixing oxidation panel 2` are whole flue, be which is provided with to entirety
Flue it is atomization injection alcohol solution alcohols injection device 4` and into whole flue injection of ozone ozone generating-device 5`,
The alcohols injection device 4` includes: the storage cabinet for containing alcohol solution, for by the alcohol solution in the storage cabinet
It is injected into the metering pump for the atomizer being located in gas mixing oxidation panel 2`；And the wet scrubbing device 3`, it is located at
The outlet end of flue gas after purification is mainly used for carrying out wet scrubbing to through gas mixing oxidation panel 2` treated flue gas, absorb
Remove SO in flue gasx, particulate matter, high-valence state NOxAnd other nitro compounds soluble easily in water, i.e., the described flue gas pretreatment
Device 1`, the gas mixing oxidation panel 2` and the wet scrubbing device 3` are sequentially communicated.On the wet scrubbing device 3`
Equipped with being connected to gas mixing oxidation panel 2` and for introducing the smoke inlet through gas mixing oxidation panel 2` treated flue gas
With for introduce washing solution solution inlet, the upper end wet scrubbing device 3` be equipped with for discharge purify after flue gas cigarette
Gas outlet, lower end be equipped with for collects wash after solution the taphole that is connected to of device for storing liquid.The gas mixing oxidation
Distribution device is equipped in section 2`.
A method of flue gas pollutant removal being carried out using system described above, there are following steps:
S1, flue gas to be processed control flue-gas temperature at 150 DEG C or less after Flue Gas Pretreatment Device 1` processing；
S2, inject a certain amount of ozone simultaneously into gas mixing oxidation panel 2` and atomization to inject a certain amount of alcohols molten
Liquid, the alcohol solution heat are quickly volatilized into alcohols gas, and treated by alcohols gas, ozone and Flue Gas Pretreatment Device 1`
Flue gas is sufficiently mixed concurrent biochemical reaction, selectively will be through Flue Gas Pretreatment Device treated flue gas middle or low price state
NOxIt is converted into the NOx and other nitro compounds soluble easily in water of high-valence state, wherein alcohols mole in mixed flue gas
With NO in mixed flue gasxThe ratio between mole is within the scope of 0.3-2, NO in injection of ozone mole and mixed flue gasxIt rubs
The ratio between your amount is not more than 1；
S3, the flue gas obtained through step S2 is handled by wet scrubbing device 3`, is passed through inside wet scrubbing device 3`
The flue gas that step S2 is obtained comes into full contact with washing solution to react, and the washing solution fully absorbs in the flue gas that step S2 is obtained
NOxTransformation substance, SOxAnd other pollutants such as particulate matter.
The alcohol solution includes but is not limited to methanol solution, ethanol solution, normal propyl alcohol solution, aqueous isopropanol.
The concentration of alcohols is within the scope of 10%-100% in the alcohol solution.
The working principle of the ozone generating-device 5` includes but is not limited to photochemical method, electrochemical process, corona discharge method；
The gas source of the ozone generating-device 5` include but is not limited to air, oxygen and other containing oxygen gas mixture.
The washing solution is but is not limited to using the alkaline chemical combination such as sodium hydroxide, potassium hydroxide, carbonate, bicarbonate
The alkaline solution that one or more of object is formulated.
The mode of washing of the wet scrubbing device 3` includes but is not limited to bubbling, spray, filler etc..
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to
So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into
Row equivalent replacement；And these are modified or replaceed, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (10)
1. a kind of flue gas pollutant removes system, for removing gas component NO from flue gas to be processedx、SOx, particulate matter etc. it is more
Kind pollutant characterized by comprising
Flue Gas Pretreatment Device, be located at flue gas to be processed arrival end, for by the temperature of flue gas to be processed be down to 150 DEG C with
Under；
Gas mixing oxidation panel, between Flue Gas Pretreatment Device and wet scrubbing device, being mainly used for will be pre- through flue gas
The NO of processing unit treated flue gas middle or low price statexIt is converted into the NO of high-valence statexNitro compound soluble easily in water with other,
The gas mixing oxidation panel is made of the alcohols mixing section and ozone mixing section being sequentially communicated or is whole flue, if the gas
Body mixed oxidization section is made of the alcohols mixing section and ozone mixing section being sequentially communicated, then the alcohols mixing section is equipped with to it
The alcohols injection device of atomization injection alcohol solution, the ozone that the ozone mixing section is equipped with injection of ozone into it occur
Device；If the gas mixing oxidation panel is whole flue, which is provided with to the atomization injection alcohol solution of whole flue
Alcohols injection device and into whole flue injection of ozone ozone generating-device；
And the wet scrubbing device, it is located at the outlet end of flue gas after purification, is mainly used for through gas mixing oxidation panel
Treated, and flue gas carries out wet scrubbing, absorbs SO in removal flue gasx, particulate matter, high-valence state NOxAnd other are soluble easily in water
Nitro compound.
2. system according to claim 1, which is characterized in that the alcohols injection device includes: molten for containing alcohols
The storage cabinet of liquid, atomizer for being injected into the alcohol solution in the storage cabinet in gas mixing oxidation panel
Metering pump.
3. system according to claim 1, which is characterized in that the wet scrubbing device is equipped with to be aoxidized with gas mixing
Duan Liantong and the molten of solution is washed for introducing smoke inlet through gas mixing oxidation panel treated flue gas and for introducing
Liquid entrance, wet scrubbing device upper end be equipped with for discharge purification after flue gas exhanst gas outlet, lower end be equipped with and be used for receive
The taphole of the device for storing liquid connection of solution after collection washing.
4. system according to claim 1, which is characterized in that be equipped with distribution device in the gas mixing oxidation panel.
5. a kind of method for carrying out flue gas pollutant removal using system described in claim 1, which is characterized in that if the gas
Body mixed oxidization section is made of the alcohols mixing section and ozone mixing section being sequentially communicated, then the method has following steps:
S1, flue gas to be processed control flue-gas temperature at 150 DEG C or less after Flue Gas Pretreatment Device processing；
S2, a certain amount of alcohol solution is injected to gas mixing oxidation panel is atomization, the alcohol solution heat is quickly volatilized into
Alcohols gas, and treated that flue gas is sufficiently mixed with Flue Gas Pretreatment Device, in mixed flue gas alcohols molar concentration with
NO in mixed flue gasxThe ratio between molar concentration is within the scope of 0.3-2；
S3, a certain amount of ozone is injected into gas mixing oxidation panel, be sufficiently mixed ozone with the flue gas obtained through step S2
Concurrent biochemical reaction, selectively by the NO of the flue gas middle or low price state obtained through step S2xIt is converted into the NO of high-valence statexAnd its
NO in his nitro compound soluble easily in water, the ozone mole of injection and the flue gas obtained through step S2xThe ratio between mole is no
Greater than 1；
S4, the flue gas obtained through step S3 is handled by wet scrubbing device, is obtained inside wet scrubbing device through step S3
To flue gas come into full contact with and react with washing solution, the washing solution fully absorbs the SO in the flue gas obtained through step S3x、
The NO of particulate matter, high-valence statexAnd other nitro compounds soluble easily in water.
6. a kind of method for carrying out flue gas pollutant removal using system described in claim 1, which is characterized in that if the gas
Body mixed oxidization section is whole flue, then the method has following steps:
S1, flue gas to be processed control flue-gas temperature at 150 DEG C or less after Flue Gas Pretreatment Device processing；
S2, a certain amount of ozone and a certain amount of alcohol solution of atomization injection are injected simultaneously into gas mixing oxidation panel, it is described
Alcohol solution heat is quickly volatilized into alcohols gas, and treated that flue gas is abundant for alcohols gas, ozone and Flue Gas Pretreatment Device
The biochemical reaction of hybrid concurrency, selectively by the NO through Flue Gas Pretreatment Device treated flue gas middle or low price statexIt is converted into
The NOx of high-valence state and other nitro compounds soluble easily in water, wherein in mixed flue gas alcohols mole with it is mixed
NO in flue gasxThe ratio between mole is within the scope of 0.3-2, NO in injection of ozone mole and mixed flue gasxThe ratio between mole is no
Greater than 1；
S3, the flue gas obtained through step S2 is handled by wet scrubbing device, is obtained inside wet scrubbing device through step S2
To flue gas come into full contact with and react with washing solution, the washing solution fully absorbs the SO in the flue gas obtained through step S2x、
The NO of particulate matter, high-valence statexAnd other nitro compounds soluble easily in water.
7. method according to claim 5 or 6, which is characterized in that the alcohol solution include but is not limited to methanol solution,
Ethanol solution, normal propyl alcohol solution, aqueous isopropanol.
8. method according to claim 5 or 6, which is characterized in that the concentration of alcohols is in 1%- in the alcohol solution
In 100% range.
9. method according to claim 5 or 6, which is characterized in that the working principle of the ozone generating-device include but
It is not limited to photochemical method, electrochemical process, corona discharge method；
The gas source of the ozone generating-device include but is not limited to air, oxygen and other containing oxygen gas mixture.
10. method according to claim 5 or 6, which is characterized in that the washing solution includes but is not limited to use hydrogen-oxygen
Change the alkaline solution that one or more of alkali compounds such as sodium, potassium hydroxide, carbonate, bicarbonate are formulated；Institute
The mode of washing for stating wet scrubbing device includes but is not limited to bubbling, spray, filler etc..
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