CN106492603A - A kind of device for removing sulfur trioxide before air preheater - Google Patents
A kind of device for removing sulfur trioxide before air preheater Download PDFInfo
- Publication number
- CN106492603A CN106492603A CN201611044142.3A CN201611044142A CN106492603A CN 106492603 A CN106492603 A CN 106492603A CN 201611044142 A CN201611044142 A CN 201611044142A CN 106492603 A CN106492603 A CN 106492603A
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- CN
- China
- Prior art keywords
- air preheater
- flue gas
- sulfur trioxide
- atomizer
- fin
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- 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.)
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—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
- B01D53/504—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 device
Abstract
A kind of device for removing sulfur trioxide before air preheater of the present invention, corresponds the alkali lye injection unit and flue gas mixed cell that arrange including multigroup；Alkali lye injection unit includes alkali lye pond, pump and the atomizer being sequentially connected；The memory storage alkali liquor absorption agent of alkali lye pond, atomizer are arranged in the front flue of air preheater；Flue gas mixed cell includes base flat and fin；Base flat is arranged on the downstream of corresponding atomizer in front flue, and arranges that fin is in base flat both sides arranged for interval along main flume direction.The present invention passes through to arrange alkali lye injection unit before air preheater in flue and sprays into alkali liquor absorption agent in flue gas, carries out flow-disturbing mixing using flue gas mixed cell, sulfur trioxide is removed using the highly basic characteristic of alkali liquor absorption agent, and removal efficiency is up to more than 80%.Ensure the mixing uniformity of flue gas and absorbent by adjusting atomizer and flue gas mixed cell, shorten reaction section length, extend air preheater heat accumulating element service life.
Description
Technical field
The invention belongs to atmosphere pollution administers field, it is related to the removing of sulfur trioxide, specially one kind is used for removing sky
The device of sulfur trioxide before pre- device.
Background technology
The widely used coal of heat power station is generated electricity as fuel.Contain element sulphur in coal, most of after burning
It is converted into sulfur dioxide and sulfur trioxide.For the unit for being provided with SCR denitration system, SCR catalyst is in catalyst nox
Sulphur Dioxide can be also catalyzed for sulfur trioxide while nitrogen is generated with ammonia reaction, and SCR denitration system is not installed
Unit is compared, and is mounted with that first three sulfur oxide concentration increased by about one time in air preheater for the unit of SCR denitration system.
Sulfur trioxide in flue gas easily forms sulfuric acid with water.The cold end corrosion that sulfuric acid causes has to heated surface at the end of boiler
There is great harmfulness.Additionally, for the unit for being provided with SCR denitration system, sulfuric acid is easy to air preheater section shape with the ammonia that escapes
Into ammonium hydrogen sulfate.Liquid sulfuric acid hydrogen ammonium has strong viscosity, highly acid, low with cryosphere ammonium hydrogen sulfate temperature in air preheater intermediate layer
Easily deposit when dew-point temperature, catch flying dust, burn into blocks air preheater, cause the damage of air preheater heat accumulating element, burner hearth to bear
The problems such as pressure fluctuation, the increase of system power consumption, air-introduced machine undercapacity.
Existing desulfurization program is mainly using wet desulphurization after air preheater, and the program can only alleviate oxysulfide to tail
Portion's flue and the harm of air, it is impossible to effectively prevent destruction of the sulfur trioxide to heated surface at the end of boiler.Therefore air preheater is developed
The removing sulfuldioxide of front sulfur trioxide is most important.Disclose in the Chinese invention patent of Publication No. CN104857841A a kind of de-
The device of sulfur trioxide in flue gas is removed, including：Feed bin, screw(-type) feeder, appendix, ejecting gun, Benitration reactor, spoiler.
The device passes through to spray into ground caustic absorption sulfur trioxide before Benitration reactor, but spoiler increases cigarette while reinforcing mixing
Atmidometer, substantially increases blower fan load.A kind of utilization is disclosed in the Chinese invention patent of Publication No. CN103055684A
Trona effectively removes the device of sulfur trioxide in flue gas and technique.Device includes smoke inlet and exhanst gas outlet, bending transition cigarette
Road, nozzle system and wear strip.The invention is by arranging nozzle system at the flue between SCR reactors afterbody and air preheater
System, into flue sprays into trona slurries, carries out absorbing and removing using the highly basic characteristic of trona to sulfur trioxide.But this
Bright nozzle is excessive, and operation stability is poor.The U.S. patent Nos of US20070231230A1 are disclosed three in a kind of removing flue gas
The method of sulfur oxide/sulfuric acid.The invention absorbs sulfur trioxide and sulfuric acid in flue gas using thiosulfate and chlorate, but should
Not using appropriate reinforcing mixing arrangement, invention is unfavorable for that absorbent is reacted with sulfur trioxide, higher in sulfur trioxide concentration
When conversion zone may extend in air preheater, burn into block air preheater.
Content of the invention
For problems of the prior art, the present invention provides a kind of dress for removing sulfur trioxide before air preheater
Put, blower fan load is little, reaction section length is short, removing speed is fast, efficiency high.
The present invention is to be achieved through the following technical solutions：
A kind of device for removing sulfur trioxide before air preheater, corresponds the alkali lye injection unit for arranging including multigroup
With flue gas mixed cell；The alkali lye injection unit includes alkali lye pond, pump and the atomizer being sequentially connected；Alkali lye pond memory storage
Alkali liquor absorption agent, atomizer are arranged in the front flue of air preheater；Described flue gas mixed cell includes base flat and the wing
Piece；Base flat is arranged on the downstream of corresponding atomizer in front flue, and arranges along main flume direction, and fin is flat in matrix
Plate both sides arranged for interval.
Preferably, described alkali liquor absorption agent active ingredient is NaOH, potassium hydroxide, potassium carbonate, saleratus, sulphur
At least one in sodium thiosulfate and potassium thiosulfate.
Preferably, the atomizer is arranged multigroup in front flue cross section, and is respectively connected with flow regulator.
Preferably, the fin is weldingly fixed on base flat, or is obtained by bending after base flat cutting.
Preferably, between the fin and base flat, angle β is 30 °～90 °, and fin with main flume angle is
5 °～90 °.
Preferably, one group of base flat both sides is respectively arranged with multigroup fin unit, all wings in every group of fin unit
Piece arranges that the arranged direction of the corresponding fin unit in both sides is mirrored symmetrically successively along main flume direction.
Preferably, the fin is triangle or quadrangle.
Preferably, the flue gas mixed cell is arranged in the flat segments of front flue with atomizer, flue gas mixed cell
At 0.2～1m of atomizer downstream.
Compared with prior art, the present invention has following beneficial technique effect：
The present invention sprays into alkali liquor absorption agent in flue gas by arranging alkali lye injection unit in flue before air preheater, utilizes
Flue gas mixed cell carries out flow-disturbing mixing, sulfur trioxide is removed using the highly basic characteristic of alkali liquor absorption agent, removal efficiency
Up to more than 80%.Ensure the mixing uniformity of flue gas and absorbent by adjusting atomizer and flue gas mixed cell, shorten
Reaction section length, the ammonium hydrogen sulfate for being effectively reduced sulfur trioxide formation are blocked to the burn into of air preheater, extend air preheater storage
Thermal element service life.Effectively shorten reaction section length under conditions of appropriate increase blower fan load, in fast eliminating flue gas
Sulfur trioxide, prevents ammonium hydrogen sulfate from generating post-etching, blocking air preheater.
Further, in flue gas mixed cell, the presence of fin causes fluid when flue gas mixed zone is flowed through, due to fin
The flow separation phenomenon of pressure change in front and back and fluid in flap surface, fluid form the vortex flow of complexity after fin
Dynamic.Strong horizontal secondary flow enhances the immixture of flue gas and alkali liquor absorption agent, accelerates sulfur trioxide elimination reaction
Carrying out.The angle of attack of fin is 5 °～90 °, and when between fin and base flat, angle β is 30 °～90 °, fin has preferably
Flow-disturbing effect.If the angle of attack is less than 30 ° less than 5, elevation angle β, fin place plane is bordering on parallel, flow-disturbing effect with direction of flow
Really poor.Meanwhile, flue gas mixed cell is less on the impact of flue gas flow channel flow area, does not cause the violent contraction of runner, therefore
Restriction loss is less.Flue gas mixed cell is formed by connecting with fin in order by flat board, simple structure, is manufactured, is convenient to mount and dismount, cost
Cheap, can be fitted in the case where guarantee efficiently mixes, removes sulfur trioxide by way of slab length by adjusting fin quantity
Answer the boiler flue of different size structure.
Description of the drawings
Fig. 1 is the structural representation of the present invention.
Fig. 2 is the structural representation of flue gas mixed cell described in present example.
Fig. 3 is the tab construction schematic diagram described in present example.
1. alkali lye pond in figure, 2. pump, 3. alkali lye conveyance conduit, 4. atomizer, 5. alkali liquor absorption agent, 6. flue gas mixing is single
Unit, 7. air preheater, 8. rear pass, 9. base flat, 10. fin.
Specific embodiment
With reference to specific embodiment, the present invention is described in further detail, described be explanation of the invention and
It is not to limit.
A kind of device for removing sulfur trioxide before air preheater of the present invention, as shown in figure 1, which includes alkali lye pond 1, is used for
Storage alkali liquor absorption agent 5；Pump 2, with inlet and liquid outlet, wherein inlet is connected with alkali lye pond 1, by adjusting pump power
Controllable 5 flow of alkali liquor absorption agent；Atomizer 4, for the injection alkali liquor absorption agent 5 in flue 8；Alkali lye conveyance conduit 3, even
Connect pump 2 and atomizer 4；Flue gas mixed cell 6, for strengthening the mixed effect of alkali lye absorbent 5 and flue gas, the flue gas is mixed
Close unit 6 to be made up of with fin 10 base flat 9, wherein fin 10 bends after by 9 cutting of base flat or welds and obtains.
Flue gas mixed cell 6 is arranged in front flue flat segments with atomizer 4, and flue gas mixed cell 6 is in 4 downstream 0.2 of atomizer
At～1m.
Wherein, 5 active ingredient of alkali liquor absorption agent is NaOH NaOH or potassium hydroxide KOH or potassium carbonate K2CO3Or carbonic acid
Hydrogen potassium KHCO3Or sodium thiosulfate Na2S2O3Or potassium thiosulfate K2S2O3.In flue gas, sulfur trioxide concentration is 1～300ppm.
Wherein, atomizer 4 can be arranged multigroup in front flue cross section, and be respectively connected with flow regulator, can basis
In flue gas in sulfur trioxide concentration, flue gas flow rate and front flue cross section sulfur trioxide distribution etc. adjust respectively each nozzle flow,
Flow velocity.
As shown in figure 3, between fin 10 and base flat 9, angle β is 30 °～90 ° in flue gas mixed cell 6, fin 10
It it is 5 °～90 ° with main flume angle, fin 10 is in 9 both sides arranged for interval of base flat；Fin 10 is triangle or four sides
In shape, this preferred embodiment by taking triangle as an example.
As shown in Fig. 29 both sides of base flat are respectively arranged with multigroup fin unit, all wings in every group of fin unit
Piece 10 arranges that the arranged direction of the corresponding fin unit in both sides is mirrored symmetrically successively along main flume direction.In this preferred embodiment
Two groups are arranged respectively per side, and the setting direction of this two groups of fin units is parallel, and all identical with mainstream smoke direction.
When specifically used, alkaline absorbent 5 selects sodium thiosulfate Na2S2O3, flue gas analysis result table in boiler flue
Bright：In flue gas, sulfur trioxide concentration is about 25ppm, flue gas flow rate about 18m/h.Na/SO in flue gas3Molar concentration rate is 2
Configuration Na2S2O3Solution, Na2S2O3Concentration is 1.5mol/L.
As shown in figure 1, a kind of for air preheater before sulfur trioxide removing means, store sodium thiosulfate alkali lye pond 1,
The pump 2 of power is provided, the atomizer 4 being connected to by alkali lye conveyance conduit 3 on pump 2 is arranged at 0.5m after atomizer 4
There is the flue gas mixed cell 6 with alkali liquor absorption agent 5 for mixed flue gas, hypo solution is with flue gas in flue gas mixed cell
It is sufficiently mixed, reacts in 6, the flue gas for being stripped of most of sulfur trioxide is subsequently entered in air preheater 7 and flowed to subsequently by rear pass 8
Processing unit.
Alkali lye injection unit and flue gas mixed cell 6 are arranged in before air preheater 7 in the flat segments of flue.According to flue shape
3 groups of atomizers 4 and 3 groups of flue gas mixed cells are selected, 4 jet main flow direction of atomizer is parallel with flue gas flow direction.Flue gas is mixed
Close unit 5 to be arranged at 4 downstream 0.5m of atomizer, along a length of 1.5m of flue gas flow direction, wide 2m, one side have been evenly arranged 15 three
Angular flow-disturbing fin.Triangular flap is 10 ° with flue gas flow direction angle, is 45 ° with base flat angle β.Flue gas is mixed in flue gas
Close and mix with absorbent sodium thiosulfate at unit, react, it is achieved that the removing of sulfur trioxide before air preheater.
Sulfur trioxide removing means is set in this example before air preheater, is removed in flue gas using the alkalescence of sodium thiosulfate
Sulfur trioxide.Under design conditions, sulfur trioxide removal efficiency is up to 83%.
Claims (8)
1. a kind of device for removing sulfur trioxide before air preheater, it is characterised in that correspond the alkali for arranging including multigroup
Liquid injection unit and flue gas mixed cell (6)；
The alkali lye injection unit includes alkali lye pond (1), pump (2) and the atomizer (4) being sequentially connected；Alkali lye pond (1) internal memory
Storage alkali liquor absorption agent (5), atomizer (4) are arranged in the front flue of air preheater (7)；
Described flue gas mixed cell (6) includes base flat (9) and fin (10)；Base flat (9) is arranged in front flue
The downstream of corresponding atomizer (4), and arrange that fin (10) is in base flat (9) both sides arranged for interval along main flume direction.
2. a kind of device for removing sulfur trioxide before air preheater according to claim 1, it is characterised in that：Described
Alkali liquor absorption agent (5) active ingredient is NaOH, potassium hydroxide, potassium carbonate, saleratus, sodium thiosulfate and thiosulfuric acid
At least one in potassium.
3. a kind of device for removing sulfur trioxide before air preheater according to claim 1, it is characterised in that：The mist
Change nozzle (4) and arrange multigroup in front flue cross section, and be respectively connected with flow regulator.
4. a kind of device for removing sulfur trioxide before air preheater according to claim 1, it is characterised in that：The wing
Piece (10) is weldingly fixed on base flat (9), or is obtained by bending after base flat (9) cutting.
5. a kind of device for removing sulfur trioxide before air preheater according to claim 1, it is characterised in that：The wing
Between piece (10) and base flat (9), angle β is 30 °～90 °, and fin (10) is 5 °～90 ° with main flume angle.
6. a kind of device for removing sulfur trioxide before air preheater according to claim 1, it is characterised in that：One group of base
Body flat board (9) both sides are respectively arranged with multigroup fin unit, and all fins (10) in every group of fin unit are successively along mainstream smoke
Arrange that the arranged direction of the corresponding fin unit in both sides is mirrored symmetrically in gas direction.
7. a kind of device for removing sulfur trioxide before air preheater according to claim 1, it is characterised in that：The wing
Piece (10) is triangle or quadrangle.
8. a kind of device for removing sulfur trioxide before air preheater according to claim 1, it is characterised in that：The cigarette
Gas mixed cell (6) is arranged in the flat segments of front flue with atomizer (4), and flue gas mixed cell (6) is in atomizer (4)
At 0.2～1m of downstream.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611044142.3A CN106492603B (en) | 2016-11-21 | 2016-11-21 | It is a kind of for removing the device of sulfur trioxide before air preheater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611044142.3A CN106492603B (en) | 2016-11-21 | 2016-11-21 | It is a kind of for removing the device of sulfur trioxide before air preheater |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106492603A true CN106492603A (en) | 2017-03-15 |
| CN106492603B CN106492603B (en) | 2019-03-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201611044142.3A Active CN106492603B (en) | 2016-11-21 | 2016-11-21 | It is a kind of for removing the device of sulfur trioxide before air preheater |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106943861A (en) * | 2017-04-18 | 2017-07-14 | 北京清新环境技术股份有限公司 | A kind of removing sulfur trioxide devices and methods therefor suitable for large scale section flue |
| CN107158925A (en) * | 2017-07-05 | 2017-09-15 | 山西新唐工程设计股份有限公司 | A kind of SCR boilers air preheater anti-blocking method |
| CN107965787A (en) * | 2017-11-22 | 2018-04-27 | 西安交通大学 | System and method for the classification rotary regenerative air preheater for mitigating ammonium hydrogen sulfate deposition |
| US20220105571A1 (en) * | 2020-10-02 | 2022-04-07 | 3D Systems, Inc. | Three-Dimensional Print Engine with Large Area Build Plane Having Optimized Gas Flow Director Structures |
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| CN105477995A (en) * | 2016-01-18 | 2016-04-13 | 北京清新环境技术股份有限公司 | Method for removing sulfur trioxide from coal-fired flue gas |
| CN105879620A (en) * | 2016-05-12 | 2016-08-24 | 大唐环境产业集团股份有限公司 | Two-stage flue gas sulphur trioxide removing device and method for flue gas purification |
| CN105879641A (en) * | 2016-06-02 | 2016-08-24 | 北京国电龙源环保工程有限公司 | Device and method for removing sulfur trioxide through alkali liquor jet atomization |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN202391524U (en) * | 2011-12-14 | 2012-08-22 | 杭州银轮科技有限公司 | Static mixer for exhaust systems |
| CN105477995A (en) * | 2016-01-18 | 2016-04-13 | 北京清新环境技术股份有限公司 | Method for removing sulfur trioxide from coal-fired flue gas |
| CN105879620A (en) * | 2016-05-12 | 2016-08-24 | 大唐环境产业集团股份有限公司 | Two-stage flue gas sulphur trioxide removing device and method for flue gas purification |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106943861A (en) * | 2017-04-18 | 2017-07-14 | 北京清新环境技术股份有限公司 | A kind of removing sulfur trioxide devices and methods therefor suitable for large scale section flue |
| CN107158925A (en) * | 2017-07-05 | 2017-09-15 | 山西新唐工程设计股份有限公司 | A kind of SCR boilers air preheater anti-blocking method |
| CN107965787A (en) * | 2017-11-22 | 2018-04-27 | 西安交通大学 | System and method for the classification rotary regenerative air preheater for mitigating ammonium hydrogen sulfate deposition |
| CN107965787B (en) * | 2017-11-22 | 2019-06-11 | 西安交通大学 | For mitigating the system and method for the classification rotary regenerative air preheater of ammonium hydrogen sulfate deposition |
| US20220105571A1 (en) * | 2020-10-02 | 2022-04-07 | 3D Systems, Inc. | Three-Dimensional Print Engine with Large Area Build Plane Having Optimized Gas Flow Director Structures |
| US11878350B2 (en) * | 2020-10-02 | 2024-01-23 | 3D Systems, Inc. | Three-dimensional print engine with large area build plane having optimized gas flow director structures |
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| CN106492603B (en) | 2019-03-01 |
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