CN106390724A - Flue-gas purifying system for boiler - Google Patents
Flue-gas purifying system for boiler Download PDFInfo
- Publication number
- CN106390724A CN106390724A CN201611074768.9A CN201611074768A CN106390724A CN 106390724 A CN106390724 A CN 106390724A CN 201611074768 A CN201611074768 A CN 201611074768A CN 106390724 A CN106390724 A CN 106390724A
- Authority
- CN
- China
- Prior art keywords
- flue gas
- purification system
- filter
- gas purification
- reaction tower
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000003546 flue gas Substances 0.000 title claims abstract description 114
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 110
- 238000006243 chemical reaction Methods 0.000 claims abstract description 59
- 239000003054 catalyst Substances 0.000 claims abstract description 31
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 20
- 230000023556 desulfurization Effects 0.000 claims abstract description 18
- 239000002245 particle Substances 0.000 claims abstract description 4
- 238000000746 purification Methods 0.000 claims description 38
- 239000003795 chemical substances by application Substances 0.000 claims description 37
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 claims description 36
- 230000003009 desulfurizing effect Effects 0.000 claims description 33
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 25
- 238000005507 spraying Methods 0.000 claims description 12
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 9
- 239000007789 gas Substances 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 9
- 238000002156 mixing Methods 0.000 claims description 8
- 239000007921 spray Substances 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 6
- 239000008187 granular material Substances 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 6
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 5
- 239000000920 calcium hydroxide Substances 0.000 claims description 5
- 235000011116 calcium hydroxide Nutrition 0.000 claims description 5
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 5
- 239000000725 suspension Substances 0.000 claims description 5
- 239000000835 fiber Substances 0.000 claims description 4
- 239000000843 powder Substances 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims 1
- 239000000428 dust Substances 0.000 abstract description 19
- 231100000572 poisoning Toxicity 0.000 abstract description 6
- 230000000607 poisoning effect Effects 0.000 abstract description 6
- 230000007797 corrosion Effects 0.000 abstract description 5
- 238000005260 corrosion Methods 0.000 abstract description 5
- 229910052783 alkali metal Inorganic materials 0.000 abstract description 4
- BIGPRXCJEDHCLP-UHFFFAOYSA-N ammonium bisulfate Chemical compound [NH4+].OS([O-])(=O)=O BIGPRXCJEDHCLP-UHFFFAOYSA-N 0.000 abstract description 4
- 230000000903 blocking effect Effects 0.000 abstract description 4
- 150000001340 alkali metals Chemical class 0.000 abstract description 3
- 229910002651 NO3 Inorganic materials 0.000 abstract 3
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 abstract 3
- 238000000034 method Methods 0.000 description 8
- 229910021529 ammonia Inorganic materials 0.000 description 7
- 235000019504 cigarettes Nutrition 0.000 description 7
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical compound S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 description 5
- 239000002923 metal particle Substances 0.000 description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 3
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- 239000005864 Sulphur Substances 0.000 description 2
- BNOODXBBXFZASF-UHFFFAOYSA-N [Na].[S] Chemical compound [Na].[S] BNOODXBBXFZASF-UHFFFAOYSA-N 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 235000011114 ammonium hydroxide Nutrition 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 230000008676 import Effects 0.000 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 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 208000018569 Respiratory Tract disease Diseases 0.000 description 1
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000003500 flue dust Substances 0.000 description 1
- -1 flue gas Alkali metal Chemical class 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 229910052711 selenium Inorganic materials 0.000 description 1
- 239000011669 selenium Substances 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 239000002594 sorbent Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/508—Sulfur oxides by treating the gases with solids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
- B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
- B01D46/2411—Filter cartridges
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
- B01D53/502—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific solution or suspension
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8631—Processes characterised by a specific device
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/12—Methods and means for introducing reactants
- B01D2259/124—Liquid reactants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/12—Methods and means for introducing reactants
- B01D2259/128—Solid reactants
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses a flue-gas purifying system for a boiler. The flue-gas purifying system comprises a mixed reaction tower and a dust and nitrate filter which are communicated. The flue-gas purifying system is characterized in that flue gas is firstly desulfurized by the mixed reaction tower, then is dedusted and denitrified by the dust and nitrate filter, and the flue-gas flow is firstly dedusted and then is denitrified when passing through the dust and nitrate filter. Therefore, the flue gas is purified according to the sequence of desulfurization, dedusting and denitrification, so that the generation of NH4HSO4 in denitrification of the flue gas is avoided, further ash blocking of an air preheater and corrosion of equipment are avoided, and the catalyst poisoning caused by alkali metal and dust particles in the flue gas is avoided to guarantee the efficiency of denitrifying reaction.
Description
Technical field
The present invention relates to flue gases purification field, particularly to a kind of flue gas purification system of boiler.
Background technology
The pollutant of Industrial Boiler discharge mainly include flue dust, oxysulfide, nitrogen oxides etc., wherein, oxysulfide
There is to lead to the increase of burn into flue gas opacity, the formation of acid rain of power station equipment, be discharged in the air and also can
Lead to the respiratory tract disease of human body.
At present, conventional Industrial Boiler smoke processing system is as shown in figure 1, Fig. 1 is flue gas purification system in prior art
Structural representation, its flue gas treating process route is：Boiler 1 ＇ flue gas, after economizer 8 ＇ discharge, enters Benitration reactor
3 ＇, ammonia water spray device 31 ＇ spray into ammonia in Benitration reactor 3 ＇, in the presence of catalyst in Benitration reactor 3 ＇, flue gas
There is denitration reaction, remove denitrification and a small amount of particulate matter, the flue gas air inlet preheater 2 ＇ heat exchange after denitration, temperature drops
Low, subsequently into cleaner unit 4 ＇ dedusting, enter back into desulfurizing tower 5 ＇, desulfurizing agent is sprayed in desulfurizing tower 5 ＇ by desulfurizing agent ejector 51 ＇,
There is desulphurization reaction in flue gas, finally, clean flue gas are discharged through chimney 7 ＇ in the presence of blower fan 6 ＇.
When flue gas flows through above-mentioned flue gas purification system, first carry out denitration reaction, then carry out dedusting and desulphurization reaction again, should
Technical process suffers from the drawback that：Benitration reactor 3 ＇, due to there is catalyst, can make the SO in flue gas2It is oxidized to SO3, SO3
With the NH escaping3Generate NH4HSO4(NH4)2SO4, NH4HSO4There is corrosivity and viscosity, may result in air preheater 2 ＇ to block
And follow-up equipment corrosion, meanwhile, also result in catalyst poisoning, affect denitration reaction efficiency.
In view of the defect that above-mentioned flue gas purification system exists is it would be highly desirable to provide a kind of flue gas desulfurization operation to be located at denitrating flue gas work
Flue gas purification system before sequence.
Content of the invention
For solving above-mentioned technical problem, for providing a kind of flue gas purification system of boiler, flue gas flows through the purpose of the present invention
When, first blended reaction tower desulfurization, then through dirt nitre filter dedusting denitration, gas cleaning order is followed successively by：Desulfurization, dedusting, de-
Nitre, thus avoid generating NH during denitrating flue gas4HSO4, and then avoid Ash Blocking in Air Preheater and equipment corrosion, and avoid in flue gas
Alkali metal and dust granules cause catalyst poisoning, to ensure the efficiency of denitration reaction.
In order to realize the purpose of the present invention, the present invention provides a kind of flue gas purification system of boiler, including be interconnected
Hybrid reaction tower and dirt nitre filter, when flue gas flows through, first through described hybrid reaction tower desulfurization, then remove through described dirt nitre filter
Dirt denitration, and flue gas flows through denitration after first dedusting during described dirt nitre filter.
It is arranged such, compared with prior art, when flue gas flows through the flue gas purification system in the present invention, purification order is：
Desulfurization, dedusting, denitration, had removed the oxysulfide in flue gas before denitration reaction, therefore, when flue gas is in dirt nitre portion
When carrying out denitration reaction, it is to avoid the catalyst in dirt nitre portion is by SO2It is oxidized to SO3, and avoid SO3With the NH escaping3Generate
NH4HSO4(NH4)2SO4, thus avoiding due to NH4HSO4Corrosivity and viscosity and the Ash Blocking in Air Preheater that causes and after
Continuous equipment corrosion.
Meanwhile, before dust removal process is located at denitration reaction, most alkali gold in flue gas can be removed before denitration reaction
Metal particles and dust, thus when avoiding flue gas to carry out denitration reaction, alkali metal particles cause catalyst poisoning, simultaneously, it is to avoid cigarette
Dust in gas causes the erosive wear of catalyst, thus improving the denitration efficiency of flue gas purification system, and ensures catalyst
Service life.
Alternatively, described hybrid reaction tower is connected with inlet air stack, and described inlet air stack is provided with desulfurizing agent ejector, is used for
Described desulfurizing agent is sprayed in described inlet air stack and mixes with flue gas.
Alternatively, described desulfurizing agent includes slaked lime powder and NaOH solution, is sprayed into described respectively with different ejectors
Inlet air stack.
Alternatively, described hybrid reaction tower bottom is additionally provided with air suspension device.
Alternatively, it is provided with some filter elements in described dirt nitre filter, described filter element is by biodegradable
The loose structure that fiber interweaving is formed, and with SCR catalyst Particles dispersed, described filter element surface is coated with smooth film, uses
Contact with described SCR catalyst in stoping the dust in flue gas；
Described flue gas purification system is additionally provided with ammonia-gas spraying device.
Alternatively, the described desulfurizing agent in flue gas is attached to described filter element surface, for flue gas desulfurization.
Alternatively, described SCR catalyst granule is nano whiskers structure, and the aperture of described smooth film is less than 0.5～0.1 μ
m.
Alternatively, described ammonia-gas spraying device is located at described hybrid reaction tower, and is located at described hybrid reaction tower flue gas import
Top.
Alternatively, it is additionally provided with card in described dirt nitre filter, described filter element hangs on described card, and passes through
Pressing plate compresses, and between described pressing plate and described filter element, is respectively provided with pad between described filter element and described card.
Alternatively, it is additionally provided with the material back-conveying device connecting described dirt nitre filter ash bucket and described hybrid reaction tower.
Brief description
Fig. 1 is the structural representation of flue gas purification system in prior art；
Fig. 2 is the structural representation of the flue gas purification system of boiler provided by the present invention.
In Fig. 1：
1 ＇ boiler, 2 ＇ air preheaters, 3 ＇ Benitration reactors, 31 ＇ ammonia water spray devices, 4 ＇ cleaner units, 5 ＇ desulfurizing towers, 51 ＇
Desulfurizing agent ejector, 6 ＇ blower fans, 7 ＇ chimneys, 8 ＇ economizers.
In Fig. 2：
1 boiler, 2 air preheaters, 3 inlet air stack, 31 desulfurizing agent ejectors, 4 hybrid reaction towers, 41 ammonia-gas spraying devices, 42
Air suspension device, 5 dirt nitre filters, 51 air-purifying chambers, 511 cards, 52 filter elements, 53 ash buckets, 54 material back-conveying devices, 6 wind
Machine, 7 chimneys, 8 economizers.
Specific embodiment
In order that those skilled in the art more fully understands technical scheme, below in conjunction with the accompanying drawings and specifically real
The present invention is described in further detail to apply example.
Refer to accompanying drawing 2, Fig. 2 is the structural representation of the flue gas purification system of boiler provided by the present invention.
In a kind of specific embodiment, the present invention provides a kind of flue gas purification system of boiler 1, as shown in Fig. 2 boiler 1
The high-temperature flue gas that burning produces escape and enter in inlet air stack 3 from economizer 8, and this flue gas purification system also includes mutually interconnecting
Logical hybrid reaction tower 4 and dirt nitre filter 5, wherein, hybrid reaction tower 4 is used for the sweetening process of flue gas, and dirt nitre filter 5 is used
Dedusting denitrification process in flue gas.
When flue gas flows through this flue gas purification system, first blended reaction tower 4 desulfurization, then take off through dirt nitre filter 5 dedusting
Nitre, and flue gas flows through denitration after first dedusting during described dirt nitre filter 5.
It is arranged such, compared with the prior art shown in Fig. 1, when flue gas flows through the flue gas purification system in the present embodiment,
Purification order is：Desulfurization, dedusting, denitration, had removed the oxysulfide in flue gas before denitration reaction, therefore, have worked as cigarette
When gas carries out denitration reaction in dirt nitre portion, it is to avoid the catalyst in dirt nitre portion is by SO2It is oxidized to SO3, and avoid SO3With escape
NH3Generate NH4HSO4(NH4)2SO4, thus avoiding due to NH4HSO4Corrosivity and viscosity and the air preheater 2 that causes
Stifled ash and follow-up equipment corrosion.
Meanwhile, before dust removal process is located at denitration reaction, most alkali gold in flue gas can be removed before denitration reaction
Metal particles and dust, thus when avoiding flue gas to carry out denitration reaction, alkali metal particles cause catalyst poisoning, simultaneously, it is to avoid cigarette
Dust in gas causes the erosive wear of catalyst, thus improving the denitration efficiency of flue gas purification system, and ensures catalyst
Service life.
Further, as shown in Fig. 2 hybrid reaction tower 4 is connected with inlet air stack 3, and inlet air stack 3 is provided with desulfurizing agent spray
Emitter 31, is mixed with flue gas for spraying into desulfurizing agent in inlet air stack 3.
It is appreciated that this desulfurizing agent ejector 31 is it is not necessary to located at inlet air stack 3, the desulphurization reaction due to flue gas exists
Occur in hybrid reaction tower 4, therefore, in order to realize mixing desulfurizing agent with flue gas, also can be by desulfurizing agent ejector 31 located at mixed
Close reaction tower 4, but, in the present embodiment, when it is located at inlet air stack 3, can occur desulphurization reaction before, make flue gas with
Desulphurizer mixing is fully and uniform, thus improving the efficiency of desulphurization reaction.
In addition, desulfurizing agent is sprayed in inlet air stack 3 by desulfurizing agent ejector 31 in spray regime, thus improving cigarette further
Gas and the mixing uniformity of desulfurizing agent.
Specifically, above-mentioned desulfurizing agent is slaked lime powder and NaOH solution, sprays into air inlet cigarette with different ejectors respectively
Road 3 is it is generally the case that the calcium to sulphur mole ratio ＞ 1 of this desulfurizing agent:1, sodium sulfur mol ratio ＜ 2:1, and the calcium to sulphur mole ratio of desulfurizing agent
Arbitrarily set on the premise of meeting above-mentioned requirements according to practical situation with sodium sulfur mol ratio, be not construed as limiting herein.
In addition, slaked lime in the present embodiment adopts ultra-fine grain diameter mealy structure, meanwhile, reduce flue gas flow rate so that cigarette
The time that gas has abundance with desulfurizing agent mixs homogeneously, thus improving the utilization rate of slaked lime, and reduces the operation of hybrid reaction tower 4
Resistance.
Further, hybrid reaction tower 4 bottom is additionally provided with air suspension device 42, and this air suspension device 42 is prevented from taking off
The materials such as sulfur agent, dust settle and are gathered in hybrid reaction tower 4 bottom, thus improving the utilization rate of desulfurizing agent, simultaneously additionally it is possible to
Flue gas and desulfurizing agent is promoted to flow to dirt nitre filter 5.
In various embodiments above, as shown in Fig. 2 being provided with some filter elements 52 in dirt nitre filter 5, this filter element 52
There is the SCR catalyst for denitration reaction and the filter house for Chalk-dust filtering, so that flue gas first passes through filter portion and filters, then warp
SCR catalyst denitration.
Specifically, this filter element 52 is the loose structure being formed by biodegradable fiber interweaving, and is catalyzed with SCR
Agent Particles dispersed, meanwhile, filter element 52 surface is coated with smooth film, for stoping the dust in flue gas from entering SCR catalyst
Interior.
It is arranged such, the smooth film on filter element 52 surface can filter dust in flue gas, NH4HSO4Deng material, thus
Avoid corrosivity and the higher NH of viscosity4HSO4It is attached to SCR catalyst, the SCR catalyst blocking causing, and then ensure that SCR urges
Agent has higher denitration efficiency, simultaneously additionally it is possible to prevent SCR catalyst due to being attached with NH4HSO4And cause flue gas to pass through
When resistance increase, blower fan 6 power consumption that leads to increases, thus ensureing that boiler 1 can normally run, and reduces its energy consumption.
Meanwhile, above-mentioned smooth film can also stop the elements such as arsenic in flue gas, selenium, potassium, sodium from entering in SCR catalyst, prevents
Stop its poisoning.Further, since filter element 52 surface smoothness is higher, when dust is contacted with this smooth film, it is difficult to be attached to
Filtering element 52 surface, so that be more prone to during using pulse backblowing technology deashing realize.
In addition, biodegradable fiber has good resistance to elevated temperatures, therefore, when high-temperature flue gas flow through, this mistake
Filtering element 52 still has good performance so that denitrification process can carry out dedusting denitration at a temperature of 350 DEG C about, and makes
The performance of dirt nitre filter 5 is not affected by dust specific resistance and gas temperature, humidity.
In the present embodiment, flue gas purification system is additionally provided with ammonia-gas spraying device 41, and liquefied ammonia or ammonia are passed through by this ammonia-gas spraying device 41
In dirt nitre filter 5, for the denitration reaction of flue gas.
In addition, in various embodiments above, when entering dirt nitre filter 5 after the blended reaction tower of flue gas 4 desulfurization, desulfuration efficiency
With sorbent utilization difficult to reach 100%, therefore, in the flue gas in dirt nitre filter 5, it is mixed with partial desulfurization agent.Work as flue gas
When flowing through filter element 52 surface, this partial desulfurization agent is filtered and is attached to filter element 52 surface it is clear that this partial desulfurization
Agent remains able to for flue gas desulfurization, thus removing the oxysulfide in flue gas further, to improve this flue gas purification system
Desulfuration efficiency.
Specifically, above-mentioned SCR catalyst granule is nano whiskers structure, and the aperture of smooth film is less than 0.5～0.1 μm.
The porosity of above-mentioned smooth film is higher, and aperture is less, and up to nanoscale, for example, the aperture of smooth film can be 0.3 μ
m.In addition, this nanoscale smooth film can be Al2O3Layer.Meanwhile, SCR catalyst granule is uniformly distributed in inside smooth film, and nanometer
The activating surface that the catalyst granules of level contributes to increasing catalyst amasss, thus improving the time of contact of flue gas and SCR catalyst,
And then improve the denitration efficiency of flue gas.
Certainly, the aperture of above-mentioned smooth film, it is not necessary to being 0.5～0.1 μm, is flexibly arranged also dependent on being actually needed,
It is not construed as limiting herein.
On the other hand, as shown in Fig. 2 above-mentioned ammonia-gas spraying device 41 is located at hybrid reaction tower 4, and it is located at hybrid reaction tower 4 cigarette
The top of gas import.
Certainly, above-mentioned ammonia-gas spraying device 41 is it is not necessary to located at hybrid reaction tower 4, the denitration reaction due to flue gas betides
In dirt nitre filter 5, and ammonia-gas spraying device 41 is to realize the purpose that liquefied ammonia or ammonia are mixed with flue gas, and therefore, it also can be located at
In dirt nitre filter 5.But, in the present embodiment, when ammonia-gas spraying device 41 is in mixing reactor 4, flue gas and ammonia or ammonia
The mixed path of water and incorporation time are all longer, thus greatly improving the mixing uniformity of the two, and then improve denitration reaction
Efficiency.
In addition, as shown in Fig. 2 being additionally provided with card 511 in dirt nitre filter 5, filter element 52 hangs on card 511,
And compressed by pressing plate, and between pressing plate and filter element 52, be respectively provided with pad between filter element 52 and card 511.
It is arranged such, it is possible to increase the reliability that filter element 52 is installed is additionally it is possible to prevent filter element 52 in card 511
On rock, thus avoid adjacent filter elements 52 bottom collision, friction lead to filter element 52 to damage.Simultaneously additionally it is possible to avoid
Flue gas leaks between card 511 and filter element 52.
In various embodiments above, as shown in Fig. 2 this flue gas purification system be additionally provided with connection dirt nitre filter 5 ash bucket 53 with
The material back-conveying device 54 of hybrid reaction tower 4, it is anti-that the material of deposition in ash bucket 53 is returned to mixing by this material back-conveying device 54
Answer in tower 4.
It should be noted that during real reaction, the utilization rate difficult to reach 100% of desulfurizing agent, lead to enter the filtration of dirt nitre
It is mixed with unreacted desulfurizing agent on a small quantity, this partial desulfurization agent enters ash charge under the filtration of filter element 52 in the flue gas of device 5
In bucket 53, meanwhile, after filter element 52 dedusting, dust falls in ash bucket 53 flue gas.Therefore, in the present embodiment, by setting
Unreacted desulfurizing agent foldback back-mixing can be closed reaction tower 4, thus improving the utilization rate of desulfurizing agent by material back-conveying device 54.
In various embodiments above, as shown in Fig. 2 after the blended reaction tower of flue gas 4 desulfurization, dirt nitre filter 5 dedusting denitration
Clean flue gas discharge from the top of dirt nitre filter 5 air-purifying chamber 51, and enter heat exchange in air preheater 2, after temperature reduces,
Discharge from chimney 7 in the presence of blower fan 6, complete the purification process of flue gas.
Above a kind of flue gas purification system of boiler provided by the present invention is described in detail.Used herein
Specific case is set forth to the principle of the present invention and embodiment, and the explanation of above example is only intended to help understand this
The method of invention and its core concept.It should be pointed out that for those skilled in the art, without departing from this
On the premise of bright principle, the present invention can also be carried out with some improvement and modify, these improve and modification also falls into present invention power
In the protection domain that profit requires.
Claims (10)
1. a kind of flue gas purification system of boiler, including the hybrid reaction tower (4) being interconnected and dirt nitre filter (5), it is special
Levy and be, when flue gas flows through, first through the desulfurization of described hybrid reaction tower (4), then through described dirt nitre filter (5) dedusting denitration, and
Flue gas flows through denitration after first dedusting during described dirt nitre filter (5).
2. flue gas purification system according to claim 1 is it is characterised in that described hybrid reaction tower (4) and inlet air stack
(3) connect, described inlet air stack (3) is provided with desulfurizing agent ejector (31), for described desulfurizing agent is sprayed into described inlet air stack
(3) mix with flue gas in.
3. flue gas purification system according to claim 2 it is characterised in that described desulfurizing agent include slaked lime powder and
NaOH solution, sprays into described inlet air stack (3) with different ejectors respectively.
4. flue gas purification system according to claim 2 is it is characterised in that described hybrid reaction tower (4) bottom is additionally provided with
Air suspension device (42).
5. the flue gas purification system according to any one of claim 2-4 is it is characterised in that described dirt nitre filter (5)
Inside it is provided with some filter elements (52), described filter element (52) is to be tied by the porous that biodegradable fiber interweaving is formed
Structure, and with SCR catalyst Particles dispersed, described filter element (52) surface is coated with smooth film, for stoping the powder in flue gas
Dirt is contacted with described SCR catalyst；
Described flue gas purification system is additionally provided with ammonia-gas spraying device (41).
6. flue gas purification system according to claim 5 it is characterised in that the described desulfurizing agent in flue gas be attached to described
Filter element (52) surface, for flue gas desulfurization.
7. flue gas purification system according to claim 5 is it is characterised in that described SCR catalyst granule is nano whiskers
Structure, the aperture of described smooth film is less than 0.5～0.1 μm.
8. flue gas purification system according to claim 5 is it is characterised in that described ammonia-gas spraying device (41) is located at described mixing
Reaction tower (4), and it is located at the top of described hybrid reaction tower (4) gas approach.
9. flue gas purification system according to claim 5 is it is characterised in that be additionally provided with described dirt nitre filter (5)
Card (511), described filter element (52) hangs on described card (511), and is compressed by pressing plate, described pressing plate and described mistake
Between filtering element (52), between described filter element (52) and described card (511), it is respectively provided with pad.
10. the flue gas purification system according to any one of claim 1-4 is it is characterised in that be additionally provided with the described dirt of connection
Nitre filter (5) ash bucket (53) and the material back-conveying device (54) of described hybrid reaction tower (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611074768.9A CN106390724A (en) | 2016-11-29 | 2016-11-29 | Flue-gas purifying system for boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611074768.9A CN106390724A (en) | 2016-11-29 | 2016-11-29 | Flue-gas purifying system for boiler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106390724A true CN106390724A (en) | 2017-02-15 |
Family
ID=58083926
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611074768.9A Pending CN106390724A (en) | 2016-11-29 | 2016-11-29 | Flue-gas purifying system for boiler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106390724A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106925109A (en) * | 2017-05-17 | 2017-07-07 | 山西大学 | Using the device and method of sulfur trioxide in swirl injection device removing coal-fired flue-gas |
| CN110252051A (en) * | 2019-05-27 | 2019-09-20 | 山东中琦环保设备制造有限公司 | A kind of boiler smoke dust-removal and desulfurizing denitration and the method for removing dioxin |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005028082A1 (en) * | 2003-08-26 | 2005-03-31 | Wuhan Kaidi Electric Power Co., Ltd. | A dry flue gas cleaning process and its system for simultaneously desulfurization and denitrating |
| CN103816796A (en) * | 2014-03-11 | 2014-05-28 | 中冶焦耐工程技术有限公司 | Low-temperature coke oven flue waste gas desulphurization and denitration process |
| CN204469517U (en) * | 2015-02-15 | 2015-07-15 | 中冶赛迪工程技术股份有限公司 | A kind of sinter fume multi-pollutant cooperated purification system |
| CN105107349A (en) * | 2015-09-15 | 2015-12-02 | 中冶焦耐工程技术有限公司 | Coke oven flue gas desulfurization and denitrification purification process and device |
| CN206730834U (en) * | 2016-11-29 | 2017-12-12 | 福建龙净环保股份有限公司 | A kind of flue gas purification system of boiler |
-
2016
- 2016-11-29 CN CN201611074768.9A patent/CN106390724A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005028082A1 (en) * | 2003-08-26 | 2005-03-31 | Wuhan Kaidi Electric Power Co., Ltd. | A dry flue gas cleaning process and its system for simultaneously desulfurization and denitrating |
| CN103816796A (en) * | 2014-03-11 | 2014-05-28 | 中冶焦耐工程技术有限公司 | Low-temperature coke oven flue waste gas desulphurization and denitration process |
| CN204469517U (en) * | 2015-02-15 | 2015-07-15 | 中冶赛迪工程技术股份有限公司 | A kind of sinter fume multi-pollutant cooperated purification system |
| CN105107349A (en) * | 2015-09-15 | 2015-12-02 | 中冶焦耐工程技术有限公司 | Coke oven flue gas desulfurization and denitrification purification process and device |
| CN206730834U (en) * | 2016-11-29 | 2017-12-12 | 福建龙净环保股份有限公司 | A kind of flue gas purification system of boiler |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106925109A (en) * | 2017-05-17 | 2017-07-07 | 山西大学 | Using the device and method of sulfur trioxide in swirl injection device removing coal-fired flue-gas |
| CN110252051A (en) * | 2019-05-27 | 2019-09-20 | 山东中琦环保设备制造有限公司 | A kind of boiler smoke dust-removal and desulfurizing denitration and the method for removing dioxin |
| CN110252051B (en) * | 2019-05-27 | 2020-11-17 | 山东中琦环保设备制造有限公司 | Method for dedusting, desulfurizing and denitrating boiler flue gas and removing dioxin |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8883106B2 (en) | Method and a device for removing nitrogen oxides and sulphur trioxide from a process gas | |
| CN101262929B (en) | Sulfur trioxide removal from a flue gas stream | |
| EP3031514A1 (en) | Exhaust gas treatment system and treatment method | |
| CN103480272A (en) | Dust-removing, denitration and desulfurization process and device for flue gas of glass kiln | |
| WO2007031551A1 (en) | Method of removing sulfur trioxide from a flue gas stream | |
| CN110252051B (en) | Method for dedusting, desulfurizing and denitrating boiler flue gas and removing dioxin | |
| WO2009043108A1 (en) | Removal of pollutants from a gas flow | |
| CN106582225A (en) | SNCR-SCR combined denitration system based on demercuration and deamination modified catalyst and denitration method achieved by adopting system | |
| CN106582286B (en) | Flue gas purification device and method | |
| CN108771967A (en) | A kind of technique of the ultra-clean processing flue gas of the dust removal integrated wet method of desulphurization denitration | |
| CN109603539A (en) | A kind of industrial smoke high temperature desulfurizing denitration dust removal system and its processing method | |
| CN112138542A (en) | High-temperature flue gas dedusting, denitration and desulfurization system and method | |
| CN106139848A (en) | A kind of flue gas pollutant purifies technique | |
| CN108261918A (en) | A kind of dust removal integrated equipment of desulphurization denitration and technique | |
| CN206730834U (en) | A kind of flue gas purification system of boiler | |
| CN205252893U (en) | Glass smoke pollutants is purifier in coordination | |
| CN209714765U (en) | A kind of industrial smoke high temperature desulfurizing denitration dust removal system | |
| CN105833692B (en) | Industrial smoke dry type low temperature cooperates with dust-removal and desulfurizing denitration removal of mercury integrated apparatus and technique | |
| CN106390724A (en) | Flue-gas purifying system for boiler | |
| CN214552547U (en) | Front-mounted cement kiln high-temperature high-dust flue gas SCR denitration device | |
| CN213885694U (en) | High-temperature flue gas dust removal denitration desulfurization system | |
| CN105435621A (en) | Glass smoke pollutant synergistic purification device | |
| CN210278800U (en) | Low-temperature catalyst denitration dust removal equipment with pottery fine filter tube | |
| CN106582233A (en) | Dry desulfurization and denitrification dust removal system for catalytic cracking regeneration flue gas | |
| CN109847578A (en) | A kind of various pollutants of fume cooperation-removal method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170215 |