CN106139868A - A kind of remove the system of sulfur trioxide in flue gas in power station boiler - Google Patents
A kind of remove the system of sulfur trioxide in flue gas in power station boiler Download PDFInfo
- Publication number
- CN106139868A CN106139868A CN201610737947.XA CN201610737947A CN106139868A CN 106139868 A CN106139868 A CN 106139868A CN 201610737947 A CN201610737947 A CN 201610737947A CN 106139868 A CN106139868 A CN 106139868A
- Authority
- CN
- China
- Prior art keywords
- station boiler
- flue gas
- absorbent solution
- absorbent
- dissolving tank
- 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.)
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Classifications
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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
- B01D53/502—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
- B01D2251/00—Reactants
- B01D2251/30—Alkali metal compounds
- B01D2251/304—Alkali metal compounds of sodium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/60—Inorganic bases or salts
- B01D2251/606—Carbonates
-
- 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
Abstract
The invention discloses and a kind of remove the system of sulfur trioxide in flue gas in power station boiler, it is made up of, wherein with injection subsystem two large divisions with storage subsystem, absorbent solution distribution absorbent solution preparation: absorbent solution preparation mainly includes drain trap, dissolving tank, accumulator tank, bucket elevator with storage subsystem；Absorbent solution distribution and injection subsystem mainly include that circulating pump, air distribute module, pneumatic type two-fluid spray nozzle, air compressor machine with solution.SO is removed for existing station boiler3The defect of method, native system can be according to the SO in station boiler actual motion flue gas3Amount, carries out SO by spraying the prefabricated absorbent solution got ready to SCR denitration device entrance3Removing, this system is selected rational absorbent, is fully dissolved into solution, it is ensured that the absorbent solution sprayed into and SO3Reaction abundance, SO3Removal efficiency more than 90%.
Description
Technical field
The present invention relates to a kind of remove the process system of sulfur trioxide in flue gas in power station boiler, belong to power station atmosphere pollution
Discharge prevention and control field.
Technical background
Large-sized station boiler can produce a certain amount of SO in running3, mostly come from two aspects: 1. in coal dust
Flammable combustion of sulfur time produce SO2, this part about 0.5%～2% is oxidized to SO3；2. due to the V in SCR catalyst2O5Right
SO2There are strong catalytic action, every layer of catalyst can make the SO of 0.2%～0.8%2It is oxidized to SO3。
SO3Main harm has: 1. SO3Can be with the NH of excess in SCR device3Carry out reaction and generate ammonium salt (ammonium sulfate and sulphuric acid
Hydrogen ammonium), understand blocking catalyst space and reduce catalyst activity, and ammonium salt thickness is not easily cleaned, and air also can be caused pre-
The corrosion of hot device and blocking；2. SO in flue gas3Increase can improve flue gas acid dew point, so that the sour gas in flue gas is more
Easily condense in the concurrently raw corrosion of flue tube wall, and power plant is to reduce corrosion to use the way improving exhaust gas temperature can increase undoubtedly
Boiler exhaust gas loses；③SO3It is discharged in air and can form the sulfuric acid mist aerosol that particle diameter is the least, light is produced scattering and causes
" blue plumage phenomenon ", and ecological and environment can cause bigger harm by its acid rain formed.
Although the desulfurizing tower that Rear of Utility Boiler is arranged is to removing SO2Efficiency the highest, but to SO3Removal efficiency only
Between 30%-50%, and owing to desulfurizing tower is arranged on after SCR and air preheater, it cannot solve SO3To SCR catalyst
The blocking caused with air preheater and etching problem.
In sum, existing relevant removing SO3Patent exist adsorbent select and preparation, spray site select, injection stream
The problem of the aspects such as amount control, needs badly and develops SO in the removing station boiler that a kind of efficiency is high, practical and cost is moderate3
Process system.
Summary of the invention
Goal of the invention: for above-mentioned prior art, proposes a kind of to remove the system of sulfur trioxide in flue gas in power station boiler,
SO3Removal efficiency more than 90%.
Technical scheme: a kind of remove the system of sulfur trioxide in flue gas in power station boiler, including absorbent solution preparation and storage
Deposit subsystem, and absorbent solution is distributed and injection subsystem；Wherein, the preparation of described absorbent solution and storage subsystem bag
Include drain trap, the dissolving tank with agitating device, accumulator tank, bucket elevator；Described bucket elevator is arranged on dissolving tank side, described in carry
Placing absorbent in bucket machine, demineralized water is communicated to dissolving tank by desalination water pump, and the outlet of drain trap is connected by drainage pump
To described dissolving tank, described dissolving tank liquid outlet is communicated to accumulator tank by feed pump；Described drain trap, dissolving tank and storage
Being equipped with steam pipe coil in storing tank, the entrance connection low-pressure steam of all steam pipe coils, the outlet of all steam pipe coils arrives
In described drain trap；
The distribution of described absorbent solution includes air compressor machine, some effusion meters, some pneumatic type two-fluids with injection subsystem
Nozzle；The liquid outlet of described accumulator tank is divided into multiple-channel output by circulating pump, and the output of every road is respectively by an effusion meter even
Receive the first input end of a pneumatic type two-fluid spray nozzle of correspondence；The output of described air compressor machine is divided into multichannel, and every road is respectively
Be connected to the second input of a pneumatic type two-fluid spray nozzle of correspondence by an effusion meter, all pneumatic type two-fluids spray
Mouth is each attached to the SCR denitration device entrance of station boiler.
Further, described absorbent is Na2CO3, all pneumatic type two-fluid spray nozzles are each attached to the SCR of station boiler
Denitrification apparatus entrance；According to SO in flue gas3Concentration, according to Na2CO3And SO3Mol ratio be 1.2～3.2 to control described storage
Store tank and be input to absorbent solution distribution and the amount of solution in injection subsystem, and be 0.2～0.5 to control even according to gas liquid ratio
Connect the effusion meter of each pneumatic type two-fluid spray nozzle.
Further, it is additionally provided with reflux line between the output of described circulating pump and described accumulator tank, this reflux line sets
There are electric control valve and effusion meter.
Further, waste liquid pool, described drain trap, dissolving tank, the bottom blow-down mouth of accumulator tank and top overflow are also included
Mouth is all connected to described waste liquid pool by pipeline, and wherein the pipeline of bottom blow-down is provided with electric control valve.
Beneficial effect: the present invention a kind of remove the system of sulfur trioxide in flue gas in power station boiler have the advantage that 1,
The Na used2CO3Absorbent is compared to Mg (OH)2Cheap with MgO etc., compared to NaHCO3And NaHSO3Dissolubility higher and
Will not decompose in SCR temperature interval, compared to Ca (OH)2Do not interfere with fly ash resistivity with CaO etc. thus cause electric precipitation
The efficiency of device declines.2, the mode using absorbent to prepare solution avoids the grinding of dry powder particle and the abrasion of nozzle and blocks up
Plug, and utilize the water " secondary-atomizing " under SCR running temperature in drop, atomizing particle size can be significantly less than dry powder particle.3, adopt
The storage of absorbent solution is carried out, it is to avoid i.e. join i.e. by the drawback brought, accurately control adsorbent and SO with accumulator tank3Mole
Ratio, it is possible to effectively control SO3Concentration of emission.4, all tank bodies and liquid-transport pipe-line use steam indirectly to heat, and on the one hand improve and inhale
Attached dose of dissolubility, reduces and sprays into the water yield in flue, reduces the water yield impact on flue-gas temperature in solution, on the other hand recycles
Steam in steam pipe coil, will condense water as a part for demineralized water needed for dissolving tank in steam pipe coil by drain trap,
The most not only improve absorbent meltage but also decrease engineering operation cost.5, pneumatic type two-fluid spray nozzle is used to make solution atomization
Particle diameter is less and atomizing angle is relatively big, thus ensures absorbent and SO3Abundant reaction, improve removal efficiency.6, SCR denitration is selected
The entrance of device can utilize SCR original flue gas flow guiding device that absorbent and flue gas are uniformly mixed as spray site, and
SO can be substantially reduced3The unnecessary NH with in SCR3The generation ammonia salt that reacts affects catalyst activity, thus has widened SCR operation
Temperature range, it is ensured that the SCR denitration ability when boiler at low load runs.
Accompanying drawing explanation
Fig. 1 is the concrete installation drawing of present invention process system；
Wherein: 1, drain trap；2, dissolving tank；3, accumulator tank；4, agitating device；5, bucket elevator；6, desalination water pump；7, hydrophobic
Pump；8, dredge pump；10, liquidometer；11, electric control valve；12, feed pump；13, steam pipe coil；14, circulating pump；15, flow
Meter；16, air compressor machine；17, pneumatic type two-fluid spray nozzle.In addition A is Na2CO3, B be demineralized water, C be low-pressure steam, D be air, E
For waste water.
Detailed description of the invention
The process system proposed below according to the present invention, further illustrates the detailed description of the invention of the present invention.
The system of sulfur trioxide in flue gas in power station boiler is removed, including absorbent solution preparation and storage as it is shown in figure 1, a kind of
Deposit subsystem, and absorbent solution is distributed and injection subsystem.Wherein, absorbent solution preparation includes dredging with storage subsystem
Water pot 1, the dissolving tank 2 with agitating device 4, accumulator tank 3, bucket elevator 5, waste liquid pool 9.Bucket elevator 5 is arranged on dissolving tank 2 one
Side, places absorbent Na in bucket elevator 52CO3, demineralized water is communicated to dissolving tank 2, the outlet of drain trap 1 by desalination water pump 6
Being communicated to dissolving tank 2 by drainage pump 7, dissolving tank 2 liquid outlet is communicated to accumulator tank 3 by feed pump 12.In order to improve
Na2CO3Meltage, is equipped with steam pipe coil 13, the entrance of all steam pipe coils 13 in drain trap 1, dissolving tank 2 and accumulator tank 3
Connection low-pressure steam, in the outlet of all steam pipe coils 13 to described drain trap 1.Drain trap 1, dissolving tank 2, accumulator tank 3
On be equipped with liquidometer 10, drain trap 1, dissolving tank 2, the bottom blow-down mouth of accumulator tank 3 and top overfall are all by pipeline even
Receive waste liquid pool 9, waste liquid pool 9 is provided with dredge pump 8.In system, desalination water pump 6, drainage pump 7, feed pump 12 and dredge pump 8 are each
Arrange 2, the using and the reserved.
With injection subsystem, absorbent solution distribution includes that air compressor machine 16, some effusion meters, some pneumatic type two-fluids spray
Mouth 17.The liquid outlet of accumulator tank 3 is divided into multiple-channel output, the output of every road to be connected by an effusion meter respectively by circulating pump 14
First input end to a corresponding pneumatic type two-fluid spray nozzle 17.The output of air compressor machine 16 is divided into multichannel, every road to lead to respectively
Crossing the second input that an effusion meter is connected to a pneumatic type two-fluid spray nozzle 17 of correspondence, all pneumatic type two-fluids spray
Mouth 17 is each attached to the SCR denitration device entrance of station boiler.Circulating pump 14 exports and is additionally provided with return duct between accumulator tank 3
Road, this reflux line is provided with effusion meter and PE valve.
First, absorbent solution distribution is with injection subsystem, and demineralized water is in desalination water pump 6 is delivered to dissolving tank 2, same
Time Na2CO3Powder is delivered in dissolving tank 2 by bucket elevator 5, and the agitating device 4 opened in dissolving tank 2 makes Na2CO3And demineralized water
It is sufficiently mixed, is prepared as the absorbent solution of concentration 10%～30%.Then, by feed pump 12 by molten for the absorbent prepared
Liquid is input to accumulator tank 3 from dissolving tank 2, and accumulator tank 3 design capacity is about 10 days consumptions of power plant.Drain trap 1, dissolving tank 2 and
Being designed with steam pipe coil in accumulator tank 3, steam condenses the water of generation in coil pipe and enters drain trap 1, and the water in drain trap 1 passes through
Dissolving tank 2 squeezed into by drainage pump 7, and all conveying liquid pipelines are all provided with steam tracing, heat tracing temperature about 40 DEG C.
Then, absorbent solution distribution and injection subsystem are according to SO in flue gas3Content, according to Na2CO3And SO3Rub
You than be 1.2～3.2 carry out absorbent solution output overall control, accumulator tank 3 output Na2CO3Amount of solution exceedes for normally needing
Measure, unnecessary Na2CO3Amount of solution is back to accumulator tank 3 by reflux line.The compressed air of air compressor machine 16 output and accumulator tank 3
The Na of output2CO3Solution enters the air being made up of some effusion meters and distributes module, each pneumatic type two-fluid spray nozzle with solution
17 can independently control air mass flow and liquid inventory, enter pneumatic type by controlling effusion meter according to gas liquid ratio 0.2～0.5
Two-fluid spray nozzle, preferably 0.4, two-fluid spray nozzle produce atomization group spray in flue gas with SO3React.Wherein,
It should be noted that in embodiment of above, can when not considering adsorbent cost and electric cleaner being affected
Select other alkaline chemicals, such as trona, NaHCO3、Mg(OH)2、MgO、Ca(OH)2With CaO etc.；When not considering SO3To SCR
Spray site is can be selected between SCR outlet and air preheater when catalyst affects；When not considering SO3Can be selected for when air preheater is affected
Spray site exports at air preheater.Na is pressed in absorbent solution output overall control2CO3And SO3Mol ratio be 1.5 optimum controls；Often
Individual pneumatic type two-fluid spray nozzle 17 is 0.4 optimum control by air mass flow and liquid inventory ratio.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For Yuan, under the premise without departing from the principles of the invention, it is also possible to make some improvements and modifications, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (4)
1. one kind removes the system of sulfur trioxide in flue gas in power station boiler, it is characterised in that: include absorbent solution preparation and storage
Deposit subsystem, and absorbent solution is distributed and injection subsystem；Wherein, the preparation of described absorbent solution and storage subsystem bag
Include drain trap (1), the dissolving tank (2) with agitating device (4), accumulator tank (3), bucket elevator (5)；Described bucket elevator (5) is arranged
In dissolving tank (2) side, placing absorbent in described bucket elevator (5), demineralized water is communicated to dissolving tank by desalination water pump (6)
(2), the outlet of drain trap (1) is communicated to described dissolving tank (2) by drainage pump (7), and described dissolving tank (2) liquid outlet leads to
Cross feed pump (12) and be communicated to accumulator tank (3)；It is equipped with steam in described drain trap (1), dissolving tank (2) and accumulator tank (3)
Coil pipe (13), the entrance connection low-pressure steam of all steam pipe coils (13), the outlet of all steam pipe coils (13) is to described
In drain trap (1)；
The distribution of described absorbent solution includes air compressor machine (16), some effusion meters, some pneumatic type two-fluids with injection subsystem
Nozzle (17)；The liquid outlet of described accumulator tank (3) is divided into multiple-channel output by circulating pump (14), and the output of every road is respectively by one
Individual effusion meter is connected to the first input end of a pneumatic type two-fluid spray nozzle (17) of correspondence；The output of described air compressor machine (16)
Being divided into multichannel, every road is connected to the second input of a pneumatic type two-fluid spray nozzle (17) of correspondence respectively by an effusion meter
End, all pneumatic type two-fluid spray nozzles (17) are each attached to the SCR denitration device entrance of station boiler.
The system of sulfur trioxide in removing flue gas in power station boiler the most according to claim 1, it is characterised in that: described absorption
Agent is Na2CO3, all pneumatic type two-fluid spray nozzles (17) are each attached to the SCR denitration device entrance of station boiler；According to flue gas
Middle SO3Concentration, according to Na2CO3And SO3Mol ratio be that 1.2～3.2 to control described accumulator tank (3), to be input to absorbent molten
Liquid distribution and the amount of solution in injection subsystem, and be 0.2～0.5 to control to connect each pneumatic type two-fluid according to gas liquid ratio
The effusion meter of nozzle (17).
The system of sulfur trioxide in removing flue gas in power station boiler the most according to claim 1 and 2, it is characterised in that: described
Circulating pump (14) output with described accumulator tank (3) between be additionally provided with reflux line, this reflux line be provided with electric control valve with
Effusion meter.
The system of sulfur trioxide in removing flue gas in power station boiler the most according to claim 3, it is characterised in that: also include giving up
Liquid pool (9), described drain trap (1), dissolving tank (2), the bottom blow-down mouth of accumulator tank (3) and top overfall are all by pipeline even
Receiving described waste liquid pool (9), wherein the pipeline of bottom blow-down is provided with electric control valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610737947.XA CN106139868A (en) | 2016-08-26 | 2016-08-26 | A kind of remove the system of sulfur trioxide in flue gas in power station boiler |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610737947.XA CN106139868A (en) | 2016-08-26 | 2016-08-26 | A kind of remove the system of sulfur trioxide in flue gas in power station boiler |
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| CN106139868A true CN106139868A (en) | 2016-11-23 |
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| CN201610737947.XA Pending CN106139868A (en) | 2016-08-26 | 2016-08-26 | A kind of remove the system of sulfur trioxide in flue gas in power station boiler |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106966411A (en) * | 2017-04-20 | 2017-07-21 | 中国恩菲工程技术有限公司 | The method for handling spodumene |
| CN107998862A (en) * | 2018-01-18 | 2018-05-08 | 福建龙净环保股份有限公司 | A kind of coal-fired plant flue gas SO3Removing system |
| CN109876616A (en) * | 2019-04-11 | 2019-06-14 | 东南大学 | A kind of fire coal boiler fume sulfur trioxide removing means |
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| CN205965481U (en) * | 2016-08-26 | 2017-02-22 | 东南大学 | System for sulfur trioxide among desorption power plant boiler flue gas |
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| US20100163399A1 (en) * | 2006-08-31 | 2010-07-01 | Mitsubishi Heavy Industries, Ltd. | Water Treatment Process for Steam Plant |
| CN101880092A (en) * | 2010-05-27 | 2010-11-10 | 江苏省电力试验研究院有限公司 | Intrinsically-safe water-feeding and oxygen-adding treatment method of once-through boiler |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106966411A (en) * | 2017-04-20 | 2017-07-21 | 中国恩菲工程技术有限公司 | The method for handling spodumene |
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| CN107998862A (en) * | 2018-01-18 | 2018-05-08 | 福建龙净环保股份有限公司 | A kind of coal-fired plant flue gas SO3Removing system |
| CN107998862B (en) * | 2018-01-18 | 2024-03-08 | 福建龙净环保股份有限公司 | Flue gas SO of coal-fired power plant 3 Removal system |
| CN109876616A (en) * | 2019-04-11 | 2019-06-14 | 东南大学 | A kind of fire coal boiler fume sulfur trioxide removing means |
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