CN106861375A - The device and method that a kind of sulfur trioxide in flue gas is administered - Google Patents
The device and method that a kind of sulfur trioxide in flue gas is administered Download PDFInfo
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- CN106861375A CN106861375A CN201710279075.1A CN201710279075A CN106861375A CN 106861375 A CN106861375 A CN 106861375A CN 201710279075 A CN201710279075 A CN 201710279075A CN 106861375 A CN106861375 A CN 106861375A
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- sulfur trioxide
- flue gas
- absorbent powder
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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
- B01D53/14—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 by absorption
- B01D53/18—Absorbing units; Liquid distributors therefor
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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
- B01D53/14—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 by absorption
- B01D53/1456—Removing acid components
- B01D53/1481—Removing sulfur dioxide or sulfur trioxide
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- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
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- Treating Waste Gases (AREA)
Abstract
The device and method that a kind of sulfur trioxide in flue gas is administered, including dry state absorbent stocking system, sorbent injection system and fluidisation wind system；By near dry state absorbent powder transport to absorbent powder cabin, be delivered to dry state absorbent powder filling car in absorbent powder cabin by carrying Pneumatic conveyer by canning cart；Sulfur trioxide concentration in dynamic monitoring air preheater front end smoke canal, when sulfur trioxide concentration value is measured more than setting concentration value, then starts the discharge valve of absorbent powder cabin bottom；By spraying dry state absorbent powder in continuous and quantitative conveying device and the accurate exhaust gases passes to denitrification apparatus front end and denitration outlet end of distribution and computation device, emitted dose is 18 times of mole of sulfur trioxide that removing is needed in unit volume flue gas, to reduce the sulfur trioxide concentration in flue gas.
Description
Technical field
The present invention relates to denitrification apparatus, the device and method that especially a kind of sulfur trioxide in flue gas is administered.
Background technology
Boiler can produce the pollutants such as NOx, SO2, SO3 in coal-fired process, increasingly strict with national environmental standard,
Pollutant after stove in flue gas in recent years, such as NOx, SO2, flue dust have obtained effective control, but SO3 present in flue gas is still
Efficiently removed.
The toxicity of SO3 is approximately 10 times of SO2, H2SO4 acid mists is easily combined to form with water, after this acid mist is discharged through chimney
After spreading in an atmosphere, serious destruction will be brought to the respiratory tract and surrounding plants of people, building, while can also be formed
Acid rain, it is very harmful.SO3 present in flue gas can improve the acid dew point of flue gas, for avoid sour gas condense cause flue and
The corrosion of equipment, need to improve exhaust gas temperature or anti-corrosion grade, cause boiler efficiency to decline indirectly, increase cost of investment；Separately
Outward, when flue gas passes through lime stone-gypsum wet absorption tower, flue-gas temperature is rapidly reduced, and SO3 is combined to form with water in flue gas
H2SO4 mist droplets, and absorption tower is low to the removing ability of H2SO4 droplets, causes chimney breast " Lan Yu " phenomenon often occur.
Power plant is set after SCR denitration device, and denitrating catalyst can promote sulfur dioxide to sulphur trioxide conversion.In denitration
In the presence of catalyst, 0.4%~1.6% sulfur dioxide is there are about to sulphur trioxide conversion, increased the dense of SO3 in flue gas
Degree, during compared to not installing SCR denitration device, increased by about one time by sulfur trioxide content in the flue gas after catalyst layer.
Sulfur trioxide can be with ammonia reaction generation ammonium hydrogen sulfate NH4HSO4 (ABS) of escape in SCR reactors.Hydrogen sulfate
Ammonium can be deposited on Benitration reactor and air preheater surface, especially in cold section of air preheater.The ammonium hydrogen sulfate of liquid is that one kind is sticked
Property and all very strong material of corrosivity, adhere to flue or equipment surface, it is extremely difficult to remove, air preheater, flue or blower fan will be caused to be stained with
Dirty, corrosion, influences unit operation stability.And fly ash granule is constantly adhered to ammonium hydrogen sulfate, will also cause the catalyst longevity
Short, air preheater the blocking of life and blower fan breathe heavily the problems such as quivering, and have a strong impact on the normal operation of denitration efficiency, system equipment and unit.
The method of current coal-fired flue-gas removing sulfur trioxide is mainly the method using injection absorbent, is divided into dry state absorption
Agent gunite (DSI) and hygrometric state sorbent injection method (WSI).
The Chinese patent of the .9 of the patent No. 201510298152 is proposed to injection calcium hydroxide or calcium oxide or oxidation in flue
Magnesium or magnesium hydroxide or sodium acid carbonate or concentrated crystal soda particle, dv=20~150 μm；The patent No. 201410721263.1
The absorbent of Chinese patent injection is calcium hydroxide or magnesia or magnesium hydroxide or sodium acid carbonate or sodium carbonate particle, dv<50
μm；The Chinese patent of the patent No. 200680033934.9 then increases additive, sodium absorbent on the basis of sodium absorbent is sprayed
Including trona or sodium bicarbonate particle, dv<40μm.Additive is selected from magnesium carbonate or calcium carbonate or magnesium hydroxide or calcium hydroxide
Or its mixture, dv=20~25 μm.
The absorbent of above-mentioned patented method injection is alkaline dry powder, belongs to DSI techniques.The suction of above-mentioned patented method injection
Dosage is received to be respectively (1.5~15) with the stoichiometric proportion of sulfur trioxide in flue gas:1 and (2~6):1 etc., using more extensive
Absorbent conveying device, cause absorbent large usage quantity, a large amount of absorbents of deposit need to be purchased, cost of investment is big, increases downstream
The burden of equipment fume treatment.
The Chinese patent of the .8 of the patent No. 201310044506 discloses one kind and trona slurries is sprayed in flue for taking off
Except the device and technique of sulfur trioxide in flue gas, mass concentration is 20%~30%, the trona of injection and the change of sulfur trioxide
Metering is learned than being 9:1 or so.The method belongs to WSI techniques, only has 87% to the removal efficiency of SO3, and absorbent consumption is big, cost
It is higher, and extrusion rate is relatively low, removal effect is poor.The Chinese patent of the patent No. 201610030666.0 discloses a kind of in denitration dress
Put the technique that stripping liquid is sprayed on the flue between the port of export and the pre- device of air.Liquid in sulfur trioxide unit volume flue gas
The emitted dose of absorbent is 1-20 times of the molal quantity of the sulfur trioxide that the position needs abjection.
Above-mentioned patented method belongs to hygrometric state sorbent injection method (WSI).WSI techniques include a set of absorbent producing device,
In order to prevent from absorbing the solidification of slurries deposition and to the blocking of pipeline, it is necessary to agitating device and rinse water system simultaneously.Increase
Maintenance and maintenance workload.
Mix accordingly, it would be desirable to develop one kind and ensure that absorbent is full and uniform with flue gas, effectively reduce absorbent consumption,
Maintenance and maintenance workload are reduced simultaneously, operating cost is reduced, and the system integration and absorbent conveying accurate measurement are improved, with maximum
Sulfur trioxide concentration in degree reduction flue gas, reduces equipment corrosion, solves air preheater and blocks etching problem, improves air preheater heat and hands over
Efficiency is changed, the device of effective improvement of sulfur trioxide in flue gas after stove is realized.
The content of the invention
The technical problems to be solved by the invention are to provide the device and method that a kind of sulfur trioxide in flue gas is administered, and reduce and inhale
Agent consumption is received, operation and repair and maintenance cost is reduced, solves the problems, such as that discharge port is blocked.
In order to solve the above technical problems, the technical scheme is that：The device that a kind of sulfur trioxide in flue gas is administered, including
Dry state absorbent stocking system and sorbent injection system, also including fluidisation wind system, the dry state absorbent stocking system bag
Include absorbent powder cabin, the dust arrester being arranged at the top of absorbent powder cabin and the discharge valve located at absorbent powder cabin bottom；It is described
Sorbent injection system includes and continuous and quantitative conveying device, the first shower nozzle being arranged in the exhaust gases passes of denitrification apparatus front end
Group and the second jet head sets being arranged in the exhaust gases passes at denitration outlet end, discharge valve pass through conveyance conduit and continuous and quantitative
The input connection of conveying device, the output end of continuous and quantitative conveying device by injection pipe respectively with the first jet head sets and the
Two jet head sets are connected；The fluidisation wind system includes some gasification aerofoils for being arranged on absorbent powder cabin bottom outer wall, heating dress
Put and air-supply arrangement, the air-supply arrangement is connected with one end of air main, the other end of air main respectively by branch road airduct with
Gasification aerofoil connection, the heater is arranged on air main, and the inside of the gasification aerofoil is provided with cavity, gasification aerofoil court
Outer one side is provided with air inlet, and gasification aerofoil is provided with some air outlets, air inlet and air outlet towards the one side in absorbent powder cabin
Uniform cavity connection.The administering method of sulfur trioxide of the present invention：Three oxygen in system dynamic monitoring air preheater gas approach
Change sulphur concentration, when sulfur trioxide concentration value is measured more than setting concentration value, then start the discharge valve of powder cabin bottom, by continuous
Quantitative conveyer accurately in the exhaust gases passes at denitrification apparatus front end and denitration outlet end spray dry state absorbent, with
Reduce the sulfur trioxide concentration in flue gas.In order to avoid the dry state absorbent moisture absorption is lumpd, uniformly gasify in absorbent powder cabin bottom
Aerofoil, the air after heating enters absorbent powder cabin bottom by the air outlet of gasification board, and the absorbent to being deposited in orlop enters
Row heating and gasification, it is to avoid powdered absorbent caking feed opening being blocked.
Used as improvement, the absorbent powder cabin is provided be connected with canning cart plus powder pipeline, plus one end of powder pipeline is provided with
Snap joint.
Used as improvement, the discharge valve includes manual discharge gate and electronic discharge gate.
Used as improvement, the air-supply arrangement is roots blower or compressed air.
Used as improvement, first jet head sets are made up of some the first shower nozzles laid along exhaust gases passes width, and described the
Two jet head sets are made up of some the second shower nozzles laid along exhaust gases passes width.
As improvement, four groups of gasification aerofoil groups are divided into altogether, four groups of gasification aerofoil groups are uniformly laid in absorbent powder cabin bottom
The surrounding in portion, every group of gasification aerofoil group includes 4 ~ 6 pieces of gasification aerofoils.
Used as improvement, the gasification aerofoil is rectangle, and the air outlet is in array distribution, a diameter of 10- of air outlet
15mm。
As improvement, high charge level detector and low Charge level measurer are provided with the absorbent powder cabin.
Used as improvement, the injection pipe is provided with distribution and computation device.
The beneficial effect brought compared with prior art of the present invention is：
The present invention is integrated by absorbent storage and continuous and quantitative conveying device, forms modularization, it is unified by after Workshop Production existing
Field assembling, it is ensured that product total quality, improves the stability of system；Filled using the conveying of accurately continuous and quantitative and distribution and computation
Put, reduce absorbent consumption, it is to avoid waste；The integrated and accurate metering of device, can effectively reduce absorbent consumption, while reducing inspection
Repair and maintenance workload, reduce operating cost, at utmost reduce sulfur trioxide concentration in flue gas, reduce equipment corrosion, solve
Air preheater blocks etching problem, improves air preheater heat exchanger effectiveness.
Brief description of the drawings
Fig. 1 is schematic structural view of the invention.
Fig. 2 is absorbent powder cabin polycrystalline substance schematic diagram.
Fig. 3 is gasification aerofoil medial surface schematic diagram.
Specific embodiment
With reference to Figure of description, the invention will be further described.
As shown in figure 1, the device that a kind of sulfur trioxide in flue gas is administered, including the spray of dry state absorbent stocking system 1, absorbent
Penetrate system 2 and fluidisation wind system 3.
The as shown in Figure 1 dry state absorbent stocking system 1 includes absorbent powder cabin 11, be arranged on absorbent powder cabin 11 pushes up
The dust arrester in portion and the discharge valve located at the bottom of absorbent powder cabin 11.The bottom of absorbent powder cabin 11 is tapered, the present embodiment
Discharge valve include manual discharge valve 14 and electronic discharge valve 15, realize manual or automatic discharging.The dust arrester of the present embodiment
It is sack cleaner 13.High charge level detector and low Charge level measurer are provided with the absorbent powder cabin 11；The absorbent powder
Storehouse 11 is provided be connected with canning cart plus powder pipeline 12, plus one end of powder pipeline 12 is provided with snap joint；Dry state absorbent powder（dv
<80μm）It is transported near absorbent powder cabin 11 by canning cart, then carrying Pneumatic conveyer by tank car absorbs dry state
Agent is delivered in absorbent powder cabin 11, when low Charge level measurer sends alarm, shows that the absorbent in powder cabin is used up soon, need to be added
Plus absorbent powder；When high charge level detector sends alarm, then show that absorbent powder cabin 11 is loaded with soon, to stop charging.
The as shown in Figure 1 sorbent injection system 2 include with continuous and quantitative conveying device 24, be arranged on denitrification apparatus before
The first jet head sets 21 and the second jet head sets 22 being arranged in the exhaust gases passes at denitration outlet end in the exhaust gases passes at end.
Discharge valve is connected by conveyance conduit with the input of continuous and quantitative conveying device 24, the output end of continuous and quantitative conveying device 24
It is connected with the first jet head sets 21 and the second jet head sets 22 respectively by injection pipe；First jet head sets 21 are by some along flue gas
The first shower nozzle composition that channel width is laid, second jet head sets 22 are by some the second shower nozzles laid along exhaust gases passes width
Composition.The injection pipe is provided with distribution and computation device 23.
As shown in Fig. 2 the fluidisation wind system 3 includes some gasification aerofoils for being arranged on the bottom outer wall of absorbent powder cabin 11
33rd, heater 32 and air-supply arrangement.The air-supply arrangement of the present embodiment is two roots blowers 31, two roots blowers 31 with
One end connection of air main, the other end of air main is connected by branch road airduct with gasification aerofoil 33 respectively, the heater
32 are arranged on air main.The present embodiment has altogether and is divided into four groups of gasification aerofoil groups, and four groups of gasification aerofoil groups are uniformly laid in absorption
The surrounding of the bottom of agent powder cabin 11, every group of gasification aerofoil group includes 4 ~ 6 pieces of gasification aerofoils 33.The gasification aerofoil 33 is rectangle,
Cavity is internally provided with, gasification aerofoil 33 one side outwardly is provided with air inlet, and gasify aerofoil 33 towards in absorbent powder cabin 11
Face is provided with some air outlets 331, and air inlet is connected with the uniform cavity of air outlet；As shown in figure 3, the air outlet is in array point
Cloth, a diameter of 10-15mm of air outlet 331.It is uniform in the bottom of absorbent powder cabin 11 in order to avoid the dry state absorbent moisture absorption is lumpd
Gasification aerofoil 33, the air after heating enters the bottom of absorbent powder cabin 11 by the air outlet of gasification board, to being deposited in orlop
Absorbent is heated and gasified, it is to avoid powdered absorbent caking feed opening being blocked.
It is of the invention to be a little：
（1）Absorbent storage and continuous and quantitative conveying device 24 is integrated, form modularization, it is unified by after Workshop Production at the scene
Assembling, it is ensured that product total quality, improves the stability of a system, reduces investment, operation and repair and maintenance cost；
（2）Using accurately continuous and quantitative conveying and distribution and computation device, emitted dose be unit volume flue gas in need removing three
1-8 times of the mole of sulfur oxide, absorbent that can be according to required for the sulfur trioxide concentration value for monitoring is precisely controlled sprays
The amount of penetrating, it is ensured that absorbent fully reacts with sulfur trioxide in flue gas, reduces absorbent consumption, it is to avoid waste, and reduces operating cost.
（3）Dry state absorbent is sprayed on the flue at denitrification apparatus front end and denitration outlet end respectively, at utmost
Sulfur trioxide concentration in flue gas is reduced, dry state absorbent is sprayed into denitrification apparatus front end, it is possible to decrease before denitrification apparatus three in flue gas
Sulfur oxide concentration, it is to avoid sulfur trioxide and the ammonium hydrogen sulfate of the ammonia reaction generation viscosity for spraying into, causes catalyst blockage, makes catalysis
Agent loses activity；Dry state absorbent is sprayed into denitrification apparatus rear end, in reduction flue gas after sulfur trioxide concentration, is set after stove can be avoided
It is standby（Such as air preheater, blower fan）Corrosion, solves air preheater and blocks etching problem, improves air preheater heat exchanger effectiveness.
Claims (10)
1. the device that a kind of sulfur trioxide in flue gas is administered, including dry state absorbent stocking system and sorbent injection system, it is special
Levy and be：Also include fluidisation wind system, the dry state absorbent stocking system includes absorbent powder cabin, is arranged on absorbent powder cabin
The dust arrester at top and the discharge valve located at absorbent powder cabin bottom；The sorbent injection system includes defeated with continuous and quantitative
Send device, the first jet head sets being arranged in the exhaust gases passes of denitrification apparatus front end and the flue gas for being arranged on denitration outlet end
The second jet head sets in passage, discharge valve is connected by conveyance conduit with the input of continuous and quantitative conveying device, continuous and quantitative
The output end of conveying device is connected with the first jet head sets and the second jet head sets respectively by injection pipe；The fluidisation wind system bag
Include some gasification aerofoils for being arranged on absorbent powder cabin bottom outer wall, heater and air-supply arrangement, the air-supply arrangement and master
One end connection of airduct, the other end of air main is connected by branch road airduct with gasification aerofoil respectively, and the heater is set
On air main, the inside of the gasification aerofoil is provided with cavity, and gasification aerofoil one side outwardly is provided with air inlet, gasification aerofoil court
One side in absorbent powder cabin is provided with some air outlets, and air inlet is connected with the uniform cavity of air outlet.
2. the device that a kind of sulfur trioxide in flue gas according to claim 1 is administered, it is characterised in that：The absorbent powder cabin
Be connected with canning cart plus powder pipeline is provided with, plus one end of powder pipeline is provided with snap joint.
3. the device that a kind of sulfur trioxide in flue gas according to claim 1 is administered, it is characterised in that：The discharge valve includes
Manual discharge gate and electronic discharge gate.
4. the device that a kind of sulfur trioxide in flue gas according to claim 1 is administered, it is characterised in that：The air-supply arrangement is
Roots blower or compressed air.
5. the device that a kind of sulfur trioxide in flue gas according to claim 1 is administered, it is characterised in that：First jet head sets
It is made up of some the first shower nozzles laid along exhaust gases passes width, second jet head sets are laid by some along exhaust gases passes width
The second shower nozzle composition.
6. the device that a kind of sulfur trioxide in flue gas according to claim 1 is administered, it is characterised in that：It is divided into four groups of gas altogether
Wind transmission plate group, four groups of gasification aerofoil groups are uniformly laid in the surrounding of absorbent powder cabin bottom, and every group of gasification aerofoil group includes 4 ~ 6 pieces
Gasification aerofoil.
7. the device that a kind of sulfur trioxide in flue gas according to claim 1 is administered, it is characterised in that：It is described gasification aerofoil be in
Rectangle, the air outlet is in array distribution, a diameter of 10-15mm of air outlet.
8. the device that a kind of sulfur trioxide in flue gas according to claim 1 is administered, it is characterised in that：The absorbent powder cabin
Inside it is provided with high charge level detector and low Charge level measurer.
9. the device that a kind of sulfur trioxide in flue gas according to claim 1 is administered, it is characterised in that：On the injection pipe
It is provided with distribution and computation device.
10. the administering method of the device that a kind of sulfur trioxide in flue gas as claimed in claim 1 is administered, it is characterised in that：
（1）, by near dry state absorbent powder transport to absorbent powder cabin, canning cart will by carrying Pneumatic conveyer for filling car
Dry state absorbent powder is delivered in absorbent powder cabin；
（2）Sulfur trioxide concentration in dynamic monitoring air preheater front end smoke canal, when measure sulfur trioxide concentration value exceed set
When determining concentration value, then start the discharge valve of absorbent powder cabin bottom；
（3）It is accurate to denitrification apparatus front end and denitration outlet end by continuous and quantitative conveying device and distribution and computation device
Exhaust gases passes in injection dry state absorbent powder, emitted dose be unit volume flue gas in need removing sulfur trioxide mole
1-8 times, to reduce the sulfur trioxide concentration in flue gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710279075.1A CN106861375A (en) | 2017-04-25 | 2017-04-25 | The device and method that a kind of sulfur trioxide in flue gas is administered |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710279075.1A CN106861375A (en) | 2017-04-25 | 2017-04-25 | The device and method that a kind of sulfur trioxide in flue gas is administered |
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| CN106861375A true CN106861375A (en) | 2017-06-20 |
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ID=59161658
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| CN201710279075.1A Pending CN106861375A (en) | 2017-04-25 | 2017-04-25 | The device and method that a kind of sulfur trioxide in flue gas is administered |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109173695A (en) * | 2018-10-17 | 2019-01-11 | 浙江德创环保科技股份有限公司 | A kind of the sulfur trioxide removing system and removal methods of coal-fired flue-gas |
| CN109701381A (en) * | 2019-02-25 | 2019-05-03 | 哈尔滨锅炉厂环保工程技术有限公司 | A system and process for removing SO3 from coal-fired flue gas |
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| CN109173695A (en) * | 2018-10-17 | 2019-01-11 | 浙江德创环保科技股份有限公司 | A kind of the sulfur trioxide removing system and removal methods of coal-fired flue-gas |
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| CN109701381A (en) * | 2019-02-25 | 2019-05-03 | 哈尔滨锅炉厂环保工程技术有限公司 | A system and process for removing SO3 from coal-fired flue gas |
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Application publication date: 20170620 |