CN106492603B - It is a kind of for removing the device of sulfur trioxide before air preheater - Google Patents
It is a kind of for removing the device of sulfur trioxide before air preheater Download PDFInfo
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- CN106492603B CN106492603B CN201611044142.3A CN201611044142A CN106492603B CN 106492603 B CN106492603 B CN 106492603B CN 201611044142 A CN201611044142 A CN 201611044142A CN 106492603 B CN106492603 B CN 106492603B
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- flue gas
- air preheater
- lye
- sulfur trioxide
- atomizer
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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
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Abstract
The present invention is a kind of for removing the device of sulfur trioxide before air preheater, the lye injection unit and flue gas mixed cell being arranged in a one-to-one correspondence including multiple groups；Lye injection unit includes sequentially connected lye pond, pump and atomizer；Lye absorbent is stored in lye pond, atomizer is arranged in the preceding flue of air preheater；Flue gas mixed cell includes base flat and fin；The downstream that atomizer is corresponded in preceding flue is arranged in base flat, and arranges that fin is in base flat two sides arranged for interval along main flume direction.The present invention sprays into lye absorbent into flue gas by the way that lye injection unit is arranged in flue before air preheater, carries out flow-disturbing mixing using flue gas mixed cell, is removed using the highly basic characteristic of lye absorbent to sulfur trioxide, removal efficiency is up to 80% or more.Guarantee the mixing uniformity of flue gas and absorbent by adjusting atomizer and flue gas mixed cell, shortens reaction section length, extend air preheater heat accumulating element service life.
Description
Technical field
The invention belongs to atmosphere pollutions to administer field, be related to the removing of sulfur trioxide, specially a kind of for removing sky
The device of sulfur trioxide before pre- device.
Background technique
Heat power station is widely used coal and generates electricity as fuel.Contain element sulphur in coal, it is most of after burning
It is converted into sulfur dioxide and sulfur trioxide.For being equipped with the unit of SCR denitration system, SCR catalyst is in catalyst nox
Sulphur Dioxide can be also catalyzed by reacting with ammonia while generating nitrogen be sulfur trioxide, and does not install SCR denitration system
Unit is compared, and is mounted with that first three sulfur oxide concentration increases 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.Low-temperature corrosion caused by sulfuric acid has heated surface at the end of boiler
There is great harmfulness.In addition, the ammonia of sulfuric acid and escape is easy to air preheater section shape for the unit for being equipped with SCR denitration system
At ammonium hydrogen sulfate.Liquid sulfuric acid hydrogen ammonium has strong viscosity, highly acid, low with cryosphere ammonium hydrogen sulfate temperature in air preheater middle layer
It is easily deposited when dew-point temperature, captures flying dust, burn into blocks air preheater, causes the damage of air preheater heat accumulating element, burner hearth negative
The problems such as pressure fluctuation, the increase of system power consumption, air-introduced machine undercapacity.
Existing desulfurization program mainly uses wet desulphurization after air preheater, and the program can only alleviate oxysulfide to tail
The harm of portion's flue and atmosphere not can effectively prevent destruction of the sulfur trioxide to heated surface at the end of boiler.Therefore exploitation air preheater
The removing sulfuldioxide of preceding sulfur trioxide is most important.It is disclosed in the Chinese invention patent of Publication No. CN104857841A a kind of de-
Except the device of sulfur trioxide in flue gas, comprising: feed bin, screw(-type) feeder, appendix, ejecting gun, Benitration reactor, spoiler.
The device absorbs sulfur trioxide by spraying into ground caustic before Benitration reactor, but spoiler increases cigarette while strengthening mixing
Atmidometer substantially increases blower load.A kind of utilization is disclosed in the Chinese invention patent of Publication No. CN103055684A
Trona effectively removes the device and technique of sulfur trioxide in flue gas.Device includes smoke inlet and exhanst gas outlet, bending transition cigarette
Road, nozzle system and wear strip.The invention is by being arranged nozzle system at the flue between SCR reactor tail portion and air preheater
System sprays into trona slurries into flue, carries out absorbing and removing to sulfur trioxide using the highly basic characteristic of trona.But the hair
Bright nozzle is excessive, and operation stability is poor.The U.S. patent Nos of US20070231230A1 disclose three in a kind of removing flue gas
Sulfur oxide/sulfuric acid method.The invention absorbs sulfur trioxide and sulfuric acid in flue gas using thiosulfate and chlorate, but should
Invention is higher in sulfur trioxide concentration without being unfavorable for absorbent and reacting with sulfur trioxide using reinforcing mixing arrangement appropriate
When conversion zone may extend in air preheater, burn into block air preheater.
Summary of the invention
Aiming at the problems existing in the prior art, the present invention provides a kind of for removing the dress of sulfur trioxide before air preheater
It sets, blower load is small, and reaction section length is short, and removing speed is fast, high-efficient.
The present invention is to be achieved through the following technical solutions:
It is a kind of for removing the device of sulfur trioxide before air preheater, the lye injection unit being arranged in a one-to-one correspondence including multiple groups
With flue gas mixed cell；The lye injection unit includes sequentially connected lye pond, pump and atomizer；It is stored in lye pond
Lye absorbent, atomizer are arranged in the preceding flue of air preheater；The flue gas mixed cell includes base flat and the wing
Piece；The downstream that atomizer is corresponded in preceding flue is arranged in base flat, and arranges along main flume direction, and fin is flat in matrix
Plate two sides arranged for interval.
Preferably, the lye absorbent effective component is sodium hydroxide, potassium hydroxide, potassium carbonate, saleratus, sulphur
At least one of sodium thiosulfate and potassium thiosulfate.
Preferably, the atomizer arranges multiple groups in preceding flue cross section, and is respectively connected with flow regulator.
Preferably, the fin is weldingly fixed on base flat, or is bent and obtained after being cut by base flat.
Preferably, angle β is 30 °~90 ° between the fin and base flat, and fin is with main flume angle ɑ
5 °~90 °.
Preferably, one group of base flat two sides is respectively arranged with multiple groups fin unit, all wings in every group of fin unit
Piece successively arranges that the arranged direction that two sides correspond to fin unit is symmetrical in mirror surface along main flume direction.
Preferably, the fin is triangle or quadrangle.
Preferably, before the flue gas mixed cell and atomizer are arranged in the flat segments of flue, flue gas mixed cell
At 0.2~1m of atomizer downstream.
Compared with prior art, the invention has the following beneficial technical effects:
The present invention sprays into lye absorbent into flue gas by the way that lye injection unit is arranged in flue before air preheater, utilizes
Flue gas mixed cell carries out flow-disturbing mixing, is removed using the highly basic characteristic of lye absorbent to sulfur trioxide, removal efficiency
Up to 80% or more.Guarantee the mixing uniformity of flue gas and absorbent by adjusting atomizer and flue gas mixed cell, shortens
Section length is reacted, the ammonium hydrogen sulfate for being effectively reduced sulfur trioxide formation blocks the burn into of air preheater, extends air preheater storage
Thermal element service life.It is effectively shortened under conditions of increasing blower load in right amount and reacts section length, in fast eliminating flue gas
Sulfur trioxide prevents ammonium hydrogen sulfate from generating post-etching, blocking air preheater.
Further, the presence of fin makes fluid when flowing through flue gas mixed zone in flue gas mixed cell, due to fin
In the flow separation phenomenon of flap surface, fluid forms complicated vortex flow after fin for the pressure change of front and back and fluid
It is dynamic.Strong lateral secondary flow enhances the immixture of flue gas Yu lye absorbent, accelerates sulfur trioxide elimination reaction
Progress.The angle of attack ɑ of fin is 5 °~90 °, and when angle β is 30 °~90 ° between fin and base flat, fin has preferable
Flow-disturbing effect.If angle of attack ɑ is less than 5, elevation angle β less than 30 °, plane where fin is bordering on parallel, flow-disturbing effect with direction of flow
Fruit is poor.Meanwhile flue gas mixed cell is smaller on the influence of flue gas flow channel flow area, does not cause the violent contraction of runner, therefore
Restriction loss is smaller.Flue gas mixed cell is orderly formed by connecting by plate with fin, and structure is simple, is manufactured, is convenient to mount and dismount, cost
It is cheap, it can be suitable in the case where guaranteeing efficiently to mix, remove sulfur trioxide with the mode of slab length by adjusting fin quantity
Answer the boiler flue of different dimensional structures.
Detailed description of the invention
Fig. 1 is structural schematic diagram of the invention.
Fig. 2 is the structural schematic diagram of flue gas mixed cell described in present example.
Fig. 3 is tab construction schematic diagram described in present example.
1. lye pond in figure, 2. pumps, 3. lye conveyance conduits, 4. atomizers, 5. lye absorbents, the mixing of 6. flue gases are single
Member, 7. air preheaters, 8. rear pass, 9. base flats, 10. fins.
Specific embodiment
Below with reference to specific embodiment, the present invention is described in further detail, it is described be explanation of the invention and
It is not to limit.
The present invention is a kind of for removing the device of sulfur trioxide before air preheater, as shown in Figure 1 comprising lye pond 1 is used for
Store lye absorbent 5；Pump 2 has inlet and liquid outlet, and wherein inlet is connected with lye pond 1, by adjusting pump power
Controllable 5 flow of lye absorbent；Atomizer 4, for spraying lye absorbent 5 into flue 8；Lye conveyance conduit 3, even
Connect pump 2 and atomizer 4；Flue gas mixed cell 6 mixes with flue gas effect for strengthening lye absorbent 5, and the flue gas is mixed
It closes unit 6 to be made of base flat 9 and fin 10, wherein fin 10 is obtained by bending or welding after cutting base flat 9.
Before flue gas mixed cell 6 and atomizer 4 are arranged in flue flat segments, flue gas mixed cell 6 is in 4 downstream 0.2 of atomizer
At~1m.
Wherein, 5 effective component of lye absorbent is sodium hydroxide NaOH or potassium hydroxide KOH or potassium carbonate K2CO3Or carbonic acid
Hydrogen potassium KHCO3Or sodium thiosulfate Na2S2O3Or potassium thiosulfate K2S2O3.Sulfur trioxide concentration is 1~300ppm in flue gas.
Wherein, atomizer 4 can arrange multiple groups in preceding flue cross section, and be respectively connected with flow regulator, can basis
In flue gas in sulfur trioxide concentration, flue gas flow rate and preceding flue cross section sulfur trioxide distribution etc. adjust respectively each nozzle flow,
Flow velocity.
As shown in figure 3, angle β is 30 °~90 ° between fin 10 and base flat 9 in flue gas mixed cell 6, fin 10
It is 5 °~90 ° with main flume angle ɑ, fin 10 is in 9 two sides arranged for interval of base flat；Fin 10 is triangle or four sides
Shape, in this preferred embodiment by taking triangle as an example.
As shown in Fig. 2, 9 two sides of base flat are respectively arranged with multiple groups fin unit, all wings in every group of fin unit
Piece 10 successively arranges that the arranged direction that two sides correspond to fin unit is symmetrical in mirror surface along main flume direction.In this preferred embodiment
Every side is arranged two groups, and the setting direction of this two groups of fin units is parallel, and all identical as mainstream smoke direction.
When specifically used, alkaline absorbent 5 selects sodium thiosulfate Na2S2O3, flue gas analysis result table in boiler flue
Bright: sulfur trioxide concentration is about 25ppm, flue gas flow rate about 18m/h in flue gas.With the Na/SO in flue gas3Molar concentration rate is 2
Configure Na2S2O3Solution, Na2S2O3Concentration is 1.5mol/L.
As shown in Figure 1, a kind of sulfur trioxide removing means for before air preheater, stores the lye pond 1 of sodium thiosulfate,
The pump 2 of power is provided, the atomizer 4 on pump 2 is connected to by lye conveyance conduit 3, is arranged at 0.5m after atomizer 4
There is the flue gas mixed cell 6 for mixed flue gas and lye absorbent 5, hypo solution and flue gas are in flue gas mixed cell
Be sufficiently mixed, react in 6, the flue gas for being stripped of most of sulfur trioxide subsequently enter in air preheater 7 flowed to by rear pass 8 it is subsequent
Processing unit.
Lye injection unit and flue gas mixed cell 6 are arranged in front of air preheater 7 in the flat segments of flue.According to flue shape
3 groups of atomizer 4 and 3 group flue gas mixed cells are selected, 4 jet stream main flow direction of atomizer is parallel with flue gas flow direction.Flue gas is mixed
It closes 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, unilateral side has been evenly arranged 15 three
Angular flow-disturbing fin.Triangular flap and flue gas flow direction angle ɑ are 10 °, are 45 ° with base flat angle β.Flue gas is mixed in flue gas
It closes and mixes, reacts with absorbent sodium thiosulfate at unit, realize the removing of sulfur trioxide before air preheater.
Sulfur trioxide removing means is set before air preheater in this example, using in the alkalinity removing flue gas of sodium thiosulfate
Sulfur trioxide.Under design conditions, sulfur trioxide removal efficiency is up to 83%.
Claims (6)
1. a kind of for removing the device of sulfur trioxide before air preheater, which is characterized in that the alkali being arranged in a one-to-one correspondence including multiple groups
Liquid injection unit and flue gas mixed cell (6)；
The lye injection unit includes sequentially connected lye pond (1), pump (2) and atomizer (4)；Lye pond (1) memory
It stores up lye absorbent (5), atomizer (4) is arranged in the preceding flue of air preheater (7)；
The flue gas mixed cell (6) includes base flat (9) and fin (10)；Base flat (9) is arranged in preceding flue
The downstream of corresponding atomizer (4), and arrange that fin (10) is in base flat (9) two sides arranged for interval along main flume direction；
Before the flue gas mixed cell (6) and atomizer (4) are arranged in the flat segments of flue, flue gas mixed cell (6) exists
At atomizer (4) 0.2~1m of downstream；
One group of base flat (9) two sides is respectively arranged with multiple groups fin unit, all fins (10) in every group of fin unit according to
Secondary to arrange along main flume direction, the arranged direction that two sides correspond to fin unit is symmetrical in mirror surface.
2. according to claim 1 a kind of for removing the device of sulfur trioxide before air preheater, it is characterised in that: described
Lye absorbent (5) effective component is sodium hydroxide, potassium hydroxide, potassium carbonate, saleratus, sodium thiosulfate and thiosulfuric acid
At least one of potassium.
3. according to claim 1 a kind of for removing the device of sulfur trioxide before air preheater, it is characterised in that: the mist
Change nozzle (4) and arrange multiple groups in preceding flue cross section, and is respectively connected with flow regulator.
4. according to claim 1 a kind of for removing the device of sulfur trioxide before air preheater, it is characterised in that: the wing
Piece (10) is weldingly fixed on base flat (9), or is bent and obtained after being cut by base flat (9).
5. according to claim 1 a kind of for removing the device of sulfur trioxide before air preheater, it is characterised in that: the wing
Angle β is 30 °~90 ° between piece (10) and base flat (9), and fin (10) and main flume angle ɑ are 5 °~90 °.
6. according to claim 1 a kind of for removing the device of sulfur trioxide before air preheater, it is characterised in that: the wing
Piece (10) is triangle or quadrangle.
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| 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 |
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| 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 |
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| CN106492603A CN106492603A (en) | 2017-03-15 |
| CN106492603B true CN106492603B (en) | 2019-03-01 |
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Families Citing this family (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 |
| 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 |
| EP4221920A1 (en) * | 2020-10-02 | 2023-08-09 | 3D Systems, Inc. | Three-dimensional print engine with large area build plane having optimized gas flow director structures |
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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 |
| 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 |
| 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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2016
- 2016-11-21 CN CN201611044142.3A patent/CN106492603B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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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