CN208542023U - Coal-fired power station boiler compressed air is atomized calcium-based slurries and removes SO3Device - Google Patents
Coal-fired power station boiler compressed air is atomized calcium-based slurries and removes SO3Device Download PDFInfo
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- CN208542023U CN208542023U CN201820789611.2U CN201820789611U CN208542023U CN 208542023 U CN208542023 U CN 208542023U CN 201820789611 U CN201820789611 U CN 201820789611U CN 208542023 U CN208542023 U CN 208542023U
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Abstract
The utility model discloses the coal-fired power station boiler compressed airs for belonging to coal-burning boiler for flue gas desulfurization, denitration apparatus field to be atomized calcium-based slurries removing SO3Device.Atomizer is arranged in the device between denitration reaction area and air preheater, and mixing pressurization accelerator air inlet line setting air compressor, liquid inlet conduit is connected to desulfurization slurry holding vessel, outlet conduit is connected to atomizer；Desulfurization slurry is atomized micro- mist for 20~40 μm of partial sizes through atomizer from mixing pressurization accelerator in the case where compressed air is pushed, and is ejected into the flue between denitration reaction area and air preheater with high diffusive；The device being capable of SO in efficient removal flue gas3, realize that low cost, low energy consumption remove SO in flue gas3, and desulfuration efficiency is up to 70% or so technical effect.
Description
Technical field
The utility model belongs to coal-burning boiler for flue gas desulfurization, denitration apparatus field, in particular to coal-fired power station boiler compression is empty
Aerosolization calcium-based slurries remove SO3Device.
Background technique
A small amount of SO is had in coal-burning power plant's operational process, in flue gas3It generates, how many couples of SO of institute's sulfur-bearing in coal3Concentration
It has a certain impact, the SO of low sulfur-bearing coal3It can be seldom 10-6Magnitude, and high-sulfur coal can make SO3Reach 30~40 μ L/L
It is even higher.It is increasingly strict with environmental protection standard, coal-fired power station boiler be equipped with catalysts selective (SCR) denitrating flue gas,
The pollutant catabolic genes facilities such as dedusting (electrostatic precipitation/bag-type dust), wet process of FGD (WFGD), to what is generated in coal-fired process
NOx, flue dust, SO2Equal Conventional pollutions have carried out effective removing.
But the SO generated in coal combustion process2About 0.5%~2% SO2It is further oxided as SO3, furnace flame
Temperature is higher, and residence time of the flue gas in high-temperature region is longer, SO3Production quantity it is more.
In economizer region (427~593 DEG C), flying dust or heating surface when flue gas passes through convection heating surface, in flue gas
On dust stratification in, iron oxide, silica, aluminium oxide, sodium oxide molybdena etc. are to SO2There is certain catalytic action；At 430~620 DEG C
Within the temperature range of, V2O5SO can be catalyzed2Generate SO3, at 590 DEG C or so, Fe2O3It can also be to SO2Oxidation generate catalytic action.
When flue gas passes through SCR device, it can inevitably be catalyzed SO2Generate SO3, in common engineering, SO2Conversion ratio
It is 0.6%~3%.With the raising of SCR running temperature, catalyst is to SO2Oxygenation efficiency increase, SO3On the one hand can in flue gas
NH3Reaction generates ammonium sulfate, and when temperature is lower than the decomposition temperature of ammonium sulfate, ammonium sulfate can be deposited on catalytic surface, and reduction is urged
The surface area of agent, the active sites of covering SCR reaction, so as to cause catalyst inactivation.Flue gas leaves Benitration reactor and enters sky
In the lower air preheater cold end of smoke temperature, SO after pre- device3Gaseous H easily generated2SO4, accelerate the ammonia escaped with SCR to occur following anti-
It answers:
2NH3+H2SO4→(NH4)2SO4
NH3+H2SO4→NH4HSO4
The ammonium sulfate and ammonium hydrogen sulfate being condensed into blocks are generated, the condensation of usual ammonium sulfate and ammonium hydrogen sulfate is also to occur in sky
The cold end heating surface of air preheater generates a kind of thick liquid being not easily cleaned, and can aggravate to corrode and block, influence equipment just
Normal continuous service.
For if any treatment measures are not added, partial size will be formed in flue gas in the power plant using WFGD and SCR device
The sulfuric acid mist aerosol of very little when these aerosols are discharged into atmosphere, can generate scattering process to light, blue plumage phenomenon is presented,
Increase the opacity of smoke evacuation.
Currently, SO in flue gas3Control technology have to be developed, widely used desulfurization technology is in China's coal fired power plant
Wet Flue Gas Desulfurization Technology based on limestone-gypsum method, but at furnace outlet, flue-gas temperature is reduced to 137~160
DEG C when, most SO3Exist in the form of gaseous sulfuric acid, in WFGD, flue gas quick refrigeration, gaseous sulfuric acid experienced solidifying process suddenly
It is changed into sulfuric acid aerosol, cannot be effectively removed by WFGD since sulfuric acid aerosol partial size is too small, with the shape of sulfuric acid mist
State is discharged into atmosphere, after desulphurization system back segment smoke temperature is lower than acid dew point, under the sulfuric acid aerosol meeting partial coagulation not being removed
Come, causes the low-temperature corrosion of chimney, traditional WFGD system is to SO3Removal efficiency be only 30% or so.
Low temperature electrostatic precipitation technology, which refers to, is arranged heat recovery apparatus in electric precipitator upstream, so that the entrance cigarette of electric precipitator
Temperature degree is reduced to 90 DEG C of acid dew-point temperature or so, and exhaust gas volumn is reduced, and dust characteristic is improved, to improve deduster
Energy.SO in flue gas3Sulfuric acid mist is formed in conjunction with water vapour, at this time due to not taking dust suppression, SO3It is adsorbed by fly ash granule
It is captured and is discharged with dust, SO by electric precipitator afterwards3Removal rate usually up to 90% or more.But due to flue-gas temperature
In acid dew point hereinafter, very big change has occurred in dust characteristic, specific resistance is greatly lowered, this is conducive to dust collection, but phase
The dust adhesive force answered can also reduce, and rapping reentrainment of dust can aggravate, but also need to back-end ductwork and existing electric precipitation
It is transformed, invests huge.
Wet cottrell (WESP) is that water is directly sprayed to discharge electrode and corona zone by nozzle, due to the ratio electricity of water
Hinder relatively small, water droplet is after corona zone is in conjunction with dust, so that the specific resistance of high resistivity dust declines.In DC high voltage
Under the action of water fog charge division go forward side by side further atomization.Electric field force, charged water spray pass through impact interception, absorption coalescence, trapping
Powder dust particle, powder dust particle reaches dust collecting electrode under the driving of electric field force, and the water mist for being sprayed on dust pole surface forms continuous water
The fine particle of capture is washed into ash bucket and is discharged with water by film, flowing water, SO3Removal efficiency up to 95% or more.But
It is since WESP is not produced in batches, the technical costs of single product is higher, while in addition to body of deduster disappears in operational process
Outside the electricity of consumption, water circulating pump of auxiliary etc. will also consume part electricity, and the NaOH solution added in flushing water will also improve one
Part operating cost, the maintenance of equipment also increases extra charge, therefore the total operating cost of WESP also removes slightly above dry type
Dirt device, and WESP is mounted in after WFGD device, the burn into dust stratification of such as air preheater of the equipment before can not alleviating WFGD etc.,
Blocking.
By directly spraying alkaline absorbent solution, such as Na to the outlet SCR2CO3, can effectively remove SO3, work as Na/SO3It rubs
When you are than being 1.5, SO3Removal efficiency up to 90%.But the basic species quality that this method sprays into is relatively too big, drop
Contacted with gas bad, dispersivity is also bad, and big drop internal can not be with SO3Contact, can to follow-up equipment generate heavy corrosion,
Blocking etc..
Utility model content
The purpose of this utility model is in view of the deficiencies of the prior art, to provide coal-fired power station boiler compressed air atomization calcium
Based slurries remove SO3Device, specific technical solution is as follows:
Coal-fired power station boiler compressed air is atomized calcium-based slurries and removes SO3Device, including it is sequentially connected boiler 1, de-
Nitre reaction zone 3, air preheater 5, ammonia-spraying grid 2 are arranged between boiler 1 and denitration reaction area 3；The setting of atomizer 4 is de-
Between nitre reaction zone 3 and air preheater 5, and it is connect with mixing pressurization 6 outlet conduit of accelerator；Mixing pressurization accelerator 6 is empty
Gas entrance pipe setting air compressor 9, liquid inlet conduit are connected to desulfurization slurry holding vessel 11；
The air compressor 9 with mix pressurization accelerator 6 between be equipped with pneumatic control valve 8, air whirl flowmeter 7；
Lime stone is modified slurries conservation tank 12, water tank 13, fine powder reserving chamber 14 and distinguishes piping connection to desulfurization slurry storage
Deposit tank 11；Fine powder reserving chamber 14 is connected to desulfurization slurry holding vessel 11 through rotary feeder 15, sets in desulfurization slurry holding vessel 11
Agitating device 10.
Atomizer 4 is using series connection spray head parallel arrangement, and spray head sum n=(4b-8A+4C)/(a-2B+C) is a, and spray head is straight
Diameter d=(a-2B-C)/2, spray orifice number is that π d/ (0.3~0.5) is a on each spray head, spray angle and horizontal plane at 65 °~
85 °, spray shapes are in open circles taper；
Atomizer 4 is mounted at denitration reaction area 3 lower boundary X=(0.15~0.2) h, spray head outer edge away from
Separable flue gas pipeline parallel wall surface A=(0.1~0.2) b, spray head outer edge apart from flue vertical walls B=(0.2~
0.3) a, adjacent spray head outer edge distance C=(0.2~0.25) a；
Wherein, a, b are respectively width at 5 upper interface of air preheater, length, h be 3 lower boundary of denitration reaction area with
5 upper interface distance of air preheater.
It is the lime stone slurry of sodium acetate modification in the lime stone modification slurries conservation tank 12, it is thin in fine powder reserving chamber 14
Powder is derived from electrostatic precipitator chamber, and fine powder partial size is 5~20 μm.
The utility model has the following beneficial effects: a small amount of sodium acetate and flying dust is added in the utility model in lime stone slurry,
And the spray regime being atomized using compressed air, desulfurization slurry is evenly distributed, stability is high, dispersivity is good, it can
With smoke contacts sufficiently, be swift in response, solve SO in smoke-gas wet desulfurization3Removal efficiency is low, while avoiding because of SO in flue gas3
Content is high and the problems such as cause the corrosion and blocking of the follow-up equipments such as air preheater；Plant modification width provided by the utility model
It spends that small, at low cost, feasibility is high, realizes low cost, SO in low energy consumption removing flue gas3, and desulfuration efficiency is up to 70% or so
Technical effect.
Detailed description of the invention
Fig. 1 is that coal-fired power station boiler compressed air provided by the utility model is atomized calcium-based slurries removing SO3Device show
It is intended to；
Fig. 2 is the main view A and side view B of 1 denitration reaction area of embodiment, 3 flue pipe local schematic diagram；
Fig. 3 is the schematic view of the mounting position of 1 atomizer 4 of embodiment；
Fig. 4 is connected mode schematic diagram of 1 atomizer 4 of embodiment in flue arrangement and nozzle；
Label declaration: 1- boiler, 2- ammonia-spraying grid, 3- denitration reaction area, 4- atomizer, 5- air preheater, 6- are mixed
Close pressurization accelerator, 7- gas vortex-shedding meter, 8- pneumatic control valve, 9- air compressor, 10- agitating device, 11- desulfurization slurry
Liquid holding vessel, 12- lime stone modified slurries conservation tank, 13- water tank, 14- fine powder reserving chamber, 15- rotary feeder.
Specific embodiment
The utility model provides coal-fired power station boiler compressed air atomization calcium-based slurries removing SO3Device, tie below
Drawings and examples are closed to be described further the utility model.
Coal-fired power station boiler compressed air atomization calcium-based slurries as shown in Figure 1 remove SO3Device include boiler 1, spray
Ammonia grid 2, denitration reaction area 3, atomizer 4, air preheater 5, mixing pressurization accelerator 6, gas vortex-shedding meter 7, gas
Dynamic regulating valve 8, air compressor 9, agitating device 10, desulfurization slurry holding vessel 11, lime stone modified slurries conservation tank 12, water storage
Tank 13, fine powder reserving chamber 14, rotary feeder 15.
Boiler 1 is sequentially connected denitration reaction area 3, air preheater 5, and wherein the setting of ammonia-spraying grid 2 is anti-in boiler 1 and denitration
It answers between area 3, the ammonia for mixed flue gas and penetrating；Atomizer 4 is set between denitration reaction area 3 and air preheater 5,
And pipeline is connected to mixing pressurization 6 outlet conduit of accelerator；The wherein width at 5 upper interface of air preheater, length difference
It is denoted as a, b, 3 lower boundary of denitration reaction area and 5 upper interface distance of air preheater are denoted as h.
Atomizer 4 uses second fluid nozzle, makes slurries micronized using compressed air flow at high speed, belongs to external mix
Formula, it is not easy to block, atomizing effect is good；Atomizer 4 is n=(4b-8A+ using series connection spray head parallel arrangement, spray head sum
4C)/(a-2B+C) is a, and jet diameters are d=(a-2B-C)/2, and spray orifice is that π d/ (0.3~0.5) is a on each spray head, spray angle
Degree and horizontal plane are at 65 °~85 °, and spray shapes are in open circles taper, to guarantee that atomizing effect and smoke contacts are more abundant；
Atomizer 4 is mounted at denitration reaction area 3 lower boundary X=(0.15~0.2) h, is that there are enough below nozzle
Space enables the SO in atomization slurry and flue gas3It comes into full contact with, fully reacting；Spray head outer edge is parallel apart from flue
Wall surface A=(0.1~0.2) b, spray head outer edge is apart from flue vertical walls B=(0.2~0.3) a, adjacent spray head
Outer edge distance C=(0.2~0.25) a, there are enough distances to prevent atomized drop to be splashed to wall surface between each section
Upper corrosion wall surface.
Lime stone is modified slurries conservation tank 12, water tank 13, fine powder reserving chamber 14 and distinguishes piping connection to desulfurization slurry storage
Tank 11 is deposited, fine powder reserving chamber 14 is connected to desulfurization slurry holding vessel 11 through rotary feeder 15, sets in desulfurization slurry holding vessel 11
There is agitating device 10.A part of slurries to the lime stone drawn in the limestone slurry liquid preparing system of desulphurization system is modified slurries deposit
In tank 12, according to the mass fraction and additive amount of lime stone lotion, sodium acetate solution is mixed into lime stone slurry conservation tank 12
As modified solution, for improving and SO in flue gas3Reactivity.Enough water is stored in water tank 13 to be used to dilute to change
Property slurries；Fine powder reserving chamber 14 stores enough flying dust fine powders being derived from electrostatic precipitator chamber, and fine powder partial size is 5~20 μ
M, fine powder adjust flow through rotary feeder 15.
Mixing pressurization 6 air inlet line of accelerator setting air compressor 9, liquid inlet conduit are connected to desulfurization slurry
Holding vessel 11.Compressed air introduces system from air compressor 9, and is accelerated in air compressor 9 with pressurization is mixed by setting
The conveying for the actuating mechanism controls driving gas source compressed air that gas vortex-shedding meter 7 and pneumatic control valve 8 between device 6 form
Tolerance.Desulfurization slurry enters in mixing pressurization accelerator 6 from desulfurization slurry storage tank 11, through being atomized under the promotion of compressed air
The atomization of nozzle 4 is that droplet particles spray into the flue between denitration reaction area 3 and air preheater 5.
SO is removed using device shown in FIG. 13Method particularly includes:
Unlatching lime stone modified slurries conservation tank 12, water tank 13,14 valve of fine powder reserving chamber, the modified slurries of lime stone,
Water, flying dust the fine powder agitated device 10 in desulfurization slurry holding vessel 11, which stir, is mixed to form desulfurization slurry；
Desulfurization slurry is pressurized to 0.1~0.25MPa after passing through mixing pressurization accelerator 6, while by air compressor 9
Under the compressed air that the air pressure of offer is 0.2~0.35MPa pushes, atomization spray is transported to from mixing pressurization accelerator 6
Mouth 4 is atomized as the atomizing particle of partial size 20~40 μm (average grain diameter is 30 μm), and is ejected into denitration reaction area 3 and air
In flue between preheater 5, the injection volume flow of desulfurization slurry is 8m3/ h~10m3/h；
In flue, atomizing particle is evaporated rapidly (atomizing particle enter after flue from be heated to be evaporated time < 0.3s),
And with SO in flue gas3It is sufficiently mixed, strong heat exchange and chemical reaction occurs, so that SO3By efficient removal, consolidating after reaction
Body particle is discharged after being captured with flue gas by electrostatic precipitator.
Wherein, desulfurization slurry each component content in desulfurization slurry holding vessel 11 are as follows: be calculated in mass percent, 10%~25%
CaCO3, 0.8%~1.2% sodium acetate, 1.8%~2.3% fine powder and surplus water；It can be with according to the consumption Y of desulfurization slurry
Be calculated the modified slurries conservation tank 12 of lime stone, water tank 13, in fine powder reserving chamber 14 each raw material specific additive amount.
The consumption Y of desulfurization slurry are as follows:
Wherein, n is calcium to sulphur mole ratio, 1.6~1.8；QvFor flue gas volume flow (standard state dry flue gas, 6%O2), m3/
h；CSO2For SO in flue gas2Concentration (standard state dry flue gas, 6%O2), mg/m3；MCaCO3For CaCO3Molal weight, 100g/mol；
MSO2For SO2Molal weight, 64g/mol；P be lime stone in pure calcium carbonate, 93%~95%；X0For calcium carbonate in desulfurization slurry
Mass fraction；Y is desulfurization slurry consumption, kg/h.
The desulfurization slurry removes SO3Principle are as follows:
On the one hand, the flying dust fine powder in desulfurization slurry can be such that lime stone slurry is distributed in modifying process more uniform,
SO in course of injection and in flue gas3Contact surface area is bigger, reacts more abundant；On the other hand, the atomization after being quickly evaporated
Dispersivity is good, heat and mass is good, comes into full contact with flue gas due to surface moisture is big for particle, SO3It is attracted on liquid level, reacts fast
Speed, and then reached efficient removal SO3Effect.Reaction equation is as follows:
SO3+H2O→H2SO4
2CH3COONa+H2SO4→Na2SO4+2CH3COOH
CaCO3+H2SO4→CaSO4+H2O+CO2↑
Embodiment 1
By taking the π type boiler of 660MW unit as an example, Fig. 2 is main view A and the side of 3 flue pipe local schematic diagram of denitration reaction area
View B, 3 cross sectional dimensions of denitration reaction area are 9.9m × 14.5m, at 5 upper interface of air preheater cross sectional dimensions be a ×
B=5.5m × 6.2m, denitration reaction area lower boundary h=5.2m at air preheater upper interface；The flue portion flue gas
Temperature is 290 DEG C~410 DEG C, and flue gas flow rate is 5m/s~8m/s.
Fig. 3 is the installation site of atomizer 4, and atomizer 4 is mounted on apart from 3 lower boundary X=0.78 of denitration reaction area
At~1.04m.
Fig. 4 is connection type of the atomizer 4 in flue arrangement and nozzle；Using series connection spray head parallel arrangement two
Row, spray head install total number 6 or 8, and the spray orifice number on each spray head is 6~9, and wherein spray orifice number is determined by jet diameters
Fixed, at 65 °~85 °, spray shapes are in open circles taper for spray angle and horizontal plane.Spray head outer edge is parallel apart from flue gas pipeline
Wall surface A=0.62~1.24m, spray head outer edge apart from flue gas pipeline vertical walls B=1.1~1.65m, two spray head outer edges away from
From C=1.1~1.375m.
The raw material and desulfurization slurry storage is fallen into the conveying capacity of 15~30kg/h that lime stone is modified in slurries conservation tank 12
The desulfurization slurry preparation amount that thin flying dust in tank 11 is prepared can meet the injection of 5h or so, prevent system from expecting and being blown that process lacks
The case where material.
Embodiment 2
For 1000MW unit tower boiler, 3 cross sectional dimensions of denitration reaction area is 15.4m × 27.9m, and air is pre-
Cross sectional dimensions is a × b=10.4m × 12.5m at hot 5 upper interface of device, and 3 lower boundary of denitration reaction area is apart from air preheater
H=12.3m at 5 upper interfaces.
Atomizer 4 is mounted at 3 lower boundary X=1.845~2.46m of denitration reaction area, be nozzle below there are
Enough spaces enable the SO in atomization slurry and flue gas3It comes into full contact with, fully reacting.Atomizer 4 is using series connection spray head
Parallel arrangement is two rows of, and spray head installs total number 8~10, and the spray orifice number on each spray head is 6~11, is determined by jet diameters
Fixed, at 65 °~85 °, spray shapes are in open circles taper for spray angle and horizontal plane.Spray head outer edge distance is parallel with main pipe rail
Wall surface A=1.25~2.5m, spray head outer edge distance and main pipe rail vertical walls B=2.08~3.12m, two spray head outer edges away from
From C=2.08~2.6m.
The raw material and desulfurization slurry storage is fallen into the conveying capacity of 15~30kg/h that lime stone is modified in slurries conservation tank 12
The desulfurization slurry preparation amount that thin flying dust in tank 11 is prepared can meet the injection of 5h or so, prevent system from expecting and being blown that process lacks
The case where material.
Claims (2)
1. coal-fired power station boiler compressed air is atomized calcium-based slurries and removes SO3Device, which is characterized in that including sequentially connected
Boiler (1), denitration reaction area (3), air preheater (5), ammonia-spraying grid (2) setting boiler (1) and denitration reaction area (3) it
Between；Atomizer (4) is arranged between denitration reaction area (3) and air preheater (5), and goes out with pressurization accelerator (6) is mixed
Mouth pipeline connection；Mixing pressurization accelerator (6) air inlet line setting air compressor (9), liquid inlet conduit are connected to
Desulfurization slurry holding vessel (11)；
The air compressor (9) with mix pressurization accelerator (6) between be equipped with pneumatic control valve (8), air whirl flowmeter
(7)；
Lime stone modified slurries conservation tank (12), water tank (13), fine powder reserving chamber (14) difference piping connection to desulfurization slurry
Holding vessel (11), fine powder reserving chamber (14) are connected to desulfurization slurry holding vessel (11) through rotary feeder (15), desulfurization slurry storage
Deposit tank (11) interior agitating device (10)；
The atomizer (4) is using series connection spray head parallel arrangement, and spray head sum n=(4b-8A+4C)/(a-2B+C) is a, spray head
Diameter d=(a-2B-C)/2, spray orifice number is that π d/ (0.3~0.5) is a on each spray head, spray angle and horizontal plane at 65 °~
85 °, spray shapes are in open circles taper；Atomizer (4) be mounted on apart from denitration reaction area (3) lower boundary X=(0.15~
0.2) at h, spray head outer edge is apart from flue parallel wall surface A=(0.1~0.2) b, and spray head outer edge is apart from fume pipe
Road vertical walls B=(0.2~0.3) a, adjacent spray head outer edge distance C=(0.2~0.25) a；Wherein, a, b are respectively
Width, length at air preheater (5) upper interface, h are denitration reaction area (3) lower boundary and air preheater (5) top
Interface distance.
2. the apparatus according to claim 1, which is characterized in that be acetic acid in the lime stone modified slurries conservation tank (12)
The modified lime stone slurry of sodium, fine powder is derived from electrostatic precipitator chamber in fine powder reserving chamber (14), and fine powder partial size is 5~20 μm.
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| CN201820789611.2U CN208542023U (en) | 2018-05-25 | 2018-05-25 | Coal-fired power station boiler compressed air is atomized calcium-based slurries and removes SO3Device |
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| CN201820789611.2U CN208542023U (en) | 2018-05-25 | 2018-05-25 | Coal-fired power station boiler compressed air is atomized calcium-based slurries and removes SO3Device |
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| CN108404643A (en) * | 2018-05-25 | 2018-08-17 | 华北电力大学 | Coal-fired power station boiler compressed air is atomized calcium-based slurries and removes SO3Device and method |
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