CN109622224A - A kind of pretreatment unit and method of the fine grained coring condensation of electron spray auxiliary - Google Patents
A kind of pretreatment unit and method of the fine grained coring condensation of electron spray auxiliary Download PDFInfo
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- CN109622224A CN109622224A CN201811562931.5A CN201811562931A CN109622224A CN 109622224 A CN109622224 A CN 109622224A CN 201811562931 A CN201811562931 A CN 201811562931A CN 109622224 A CN109622224 A CN 109622224A
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- coring
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- electron spray
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/017—Combinations of electrostatic separation with other processes, not otherwise provided for
- B03C3/0175—Amassing particles by electric fields, e.g. agglomeration
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/34—Constructional details or accessories or operation thereof
- B03C3/40—Electrode constructions
- B03C3/45—Collecting-electrodes
- B03C3/53—Liquid, or liquid-film, electrodes
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Abstract
The invention discloses the pretreatment units and method of a kind of auxiliary fine grained coring condensation of electron spray, the pretreatment unit of coring condensation of the invention includes flue gas pretreater, micro electrospray system, and entire flue gas pretreatment is internal to be divided into electricity auxiliary coring area and condensation vapor area.Under specific voltage range and range of flow, capillary generates hundreds of nanometers to 1-2 microns of electrification mist drop, it charges mist drop and the broken Charged Droplet for generating tens nanometers to hundred nanometers of coulomb occurs under evaporation, and form coronal embryos in surface particles rapidly under the effect of electric image power.Fine grained with coronal embryos grows up into rapidly the size that traditional deduster can remove in water-setting interface.Using above-mentioned apparatus and method, it can use electrospray and the broken ability for generating tens nanometer band mists drop of coulomb, and this mist drop is adsorbed on particle surface and forms liquid embryos, effectively increase nucleation rate and reduces the subsequent condensation vapor time, improve into big rate.
Description
Technical field
The invention belongs to technical field of waste gas treatment, and in particular to a kind of pre- place of electron spray auxiliary fine grained coring condensation
Manage device and method.
Background technique
Energy resource structure of the China based on fire coal causes that be discharged into the pollutants such as fine grained in atmospheric environment increasing,
Especially PM2.5 (equivalent aerodynamic diameter is less than or equal to 2.5 microns of particulate matter) is particularly acute.In recent years, China is each
Ground takes place frequently large-scale haze weather, causes the worsening of ambient air quality, has seriously affected the physical and mental health of the mankind.
Therefore the fine particle effectively in removing coal-fired flue-gas, especially PM2.5 have become the important technology in atmospheric environment improvement
Problem.Coal-fired flue-gas processing technique traditional at present can effectively remove 99% or more particulate matter, but imitate to the removing of PM2.5
Rate only has 25% or so.
Removing sulfuldioxide and method for PM2.5 mainly use the upgrading of existing equipment, mainly in existing dedusting
Dust preprocessing device is installed before equipment, mainly includes, electrostatic is poly- simultaneously, magnetic field is poly- simultaneously, chemical agglomeration, sound field are poly- and and water
Vapour phase change technique etc..Research shows that steam phase transformation promotes fine particle to grow up into most promising dedusting pretreatment skill
One of art.The principle that steam phase transformation promotes fine particle to grow up is, under the conditions of oversaturated, water vapour is using fine particle as core
It is formed centrally embryos, and becomes bigger dust-laden drop in the further condensation growth in embryos surface.Although steam phase transformation can promote
70% or more fine particle grows up and is able to achieve subsequent effective removing, but still has part fine particle in pretreatment unit
It is difficult to the purpose grown up to being removed by follow up device.This is because saturation degree needed for forming embryos on fine grained surface is related,
It is more difficult that liquid embryos is generated if steam-laden degree is undesirable；However it even if is formed there are certain degree of supersaturation
Embryos there is still a need for the regular hour, growing up for subsequent droplet is also required to the regular hour.And fine grained is in pre-dedusting device
Usually all within several seconds, therefore by steam, on fine particle surface, condensation promotes fine particle to grow up to traditional merely
There are still certain difficulties for particle size range needed for cleaner.
Summary of the invention
To solve the above problems, the invention discloses a kind of electron spray auxiliary fine grained coring condensation pretreatment unit and
Method, using electron spray generate tens nanometers to several hundred nanoscales electrification mist drip, and under electrostatic interaction quickly with thin
Grain object is poly- simultaneously, and mist drips the liquid embryos for becoming particle surface, facilitate steam in the quick coring on fine particle surface and
The size that condensation growth can be removed to traditional cleaner.
In order to achieve the above objectives, technical scheme is as follows:
A kind of pretreatment unit of electron spray auxiliary fine grained coring condensation, the cylinder-shaped flue gas placed vertically including one
Pretreater；Flue gas pretreater bottom is equipped with gas inlet, and top is equipped with exhanst gas outlet, in gas inlet, exhanst gas outlet
Heart line is overlapped with the center line of flue gas pretreater；Region in flue gas pretreater, between gas inlet and exhanst gas outlet
There is electron spray to assist coring area, condensation vapor area, wherein condensation vapor area locates in advance in the top in electron spray auxiliary coring area, flue gas
The outside for managing tower is equipped with electrospray system；Condensation vapor area bottom outside is equipped with water vapour import；Electron spray assists coring
The left and right sides in area is equipped with capillary nozzle；Micrometeor syringe pump and high pressure in the capillary nozzle connection electrospray system
Electrostatic generator.
A kind of preprocess method of electron spray auxiliary fine grained coring condensation of the present invention, has follow steps:
By gas inlet by it is containing fine particle and have certain temperature flue gas input flue gas pretreater in, simultaneously
Micrometeor syringe pump and HV generator are opened, capillary nozzle generation cone jet atomization mode generates superfine with electro-hydraulic
Body droplet；Charged Droplet reaches Rayleigh limit realization second-time breakage after micro evaporation occurs under flue gas effect, can be formed several
The superfine highly charged drop of ten nanometers level；This superfine Charged Droplet under electrostatic force rapidly in conjunction with fine particle,
Liquid embryos is formed on fine particle surface；Fine particle with embryos enters condensation vapor area, while by vapor from steaming
Vapour entrance inputs condensation vapor area, and the vapor in condensation vapor area is made just to reach hypersaturated state；In condensation vapor area
Water vapour condense to form big dust-laden drop with the fine particle surface of embryos rapidly.
Wherein capillary nozzle supplies liquid by micrometeor syringe pump；Capillary nozzle is mentioned by HV generator
For voltage needed for being atomized, capillary nozzle forms cone jet atomization in electron spray auxiliary coring area and generates a large amount of small droplet.
Liquid outlet is equipped in coal-fired flue-gas pretreater bottom；It, must to guarantee that dispersed jet is stable cone jet atomization mode
The range of palpus limited flow rate and voltage.By experiment it is found that the minimum value of its flow is q0=σ ε0/ ρ K, wherein σ is the table of liquid
Face tension, ε0For permittivity of vacuum, ρ is the density of liquid, and K is the conductivity of liquid, and maximum stream flow is no more than 100q0.Electricity
The range of pressure is U1And U2Between, specific value and flow have certain relationship.
The innovation of the invention consists in that:
1. generating electrification mist drop using the method for electron spray, mist drop is charged under the flue gas of certain temperature and is evaporated
Phenomenon generates secondary-atomizing to realize that coulomb is broken, forms tens nanometers of electrification small droplet；
2. electrification tens nanometers of mist drip under the action of electrostatic force in conjunction with uncharged fine particle, i.e.,
Grain object surface forms one or more drop embryos, this embryos is much larger than the size of critical embryos, realizes even if unsaturation
Also the possibility of liquid embryos can be generated under state；
3. since electric assisted atomization forms liquid embryos on fine particle surface, when it enters condensation vapor area, at this time
Even if the degree of supersaturation of steam is very low, steam is still able to achieve in the condensation on fine particle surface, realizes growing up for fine particle；
4. the flow of electric assisted atomization is extremely low, water consumption is minimum, is conducive to save water resource；Simultaneously because electron spray is forced
Property produce liquid embryos on fine particle surface, therefore the quantity of steam inputted at condensation vapor area also suitably reduces, section
The about dosage of vapor.
Detailed description of the invention
Fig. 1 is the pretreatment unit schematic diagram that electron spray assists the steam coring of fine grained surface.
Reference signs list:
1. exhanst gas outlet；2. condensation vapor area；3. electron spray assists coring area；4. electrospray system；5. gas inlet；6.
Liquid row
Outlet；7. HV generator；8. micrometeor syringe pump；9. capillary nozzle；10. steam entry.
Fig. 2 is that the coulomb of drop is crushed schematic diagram.
Fig. 3 is that nanoscale droplet adheres to the schematic diagram to form embryos in surface particles.
Specific embodiment
With reference to the accompanying drawings and detailed description, the present invention is furture elucidated, it should be understood that following specific embodiments are only
For illustrating the present invention rather than limiting the scope of the invention.It should be noted that word " preceding " used in the following description,
" rear ", "left", "right", "up" and "down" refer to that the direction in attached drawing, word "inner" and "outside" refer respectively to direction or remote
Direction from geometric center of specific component.
As shown, a kind of pretreatment unit of electron spray auxiliary fine grained coring condensation of the present invention, including one
A flue gas pretreater placed vertically；Flue gas pretreater bottom is equipped with gas inlet 5, and one is connected on gas inlet 5 and is erected
Straight smoke-intake pipe road, described smoke-intake pipe road one end extend into always inside flue gas pretreater；The highest point in smoke-intake pipe road is high
In tower bottommost；Exhanst gas outlet 1 is equipped at the top of flue gas pretreater, the center line and flue gas of exhanst gas outlet 1 and gas inlet 5 are pre-
The center line for the treatment of column coincides together.In flue gas pretreater, region between gas inlet and exhanst gas outlet is from upper
It is divided into condensation vapor area 2, electron spray auxiliary coring area 3 under and；The bottom in condensation vapor area is equipped with 2-3 to steam entry 10,
The height of bottom of each steam entry 10 apart from fume treatment tower is consistent, and along 2 outer wall equidistantly distributed of condensation vapor area；Water
It is connected to steam input pipe on steam inlet 10, the center line of the length direction of steam input pipe perpendicular to flue gas pretreater.Electricity
The flue gas pretreater inner wall where auxiliary coring area 3 is equipped with 3-6 to capillary atomizer 9, capillary atomizer by spraying
Internal diameter between 0.10-0.50mm, the central axis of axis direction and flue gas pretreater.Capillary atomizer
Position is located at the middle position of the place flue gas pretreater in electricity auxiliary coring area.Each capillary atomizer 9 needs vertically to wear
The wall surface of flue gas pretreater is crossed, and insulation processing is carried out using seal and wall surface, so as to the band of capillary atomizer
Electricity and be unlikely to make flue gas pretreater wall surface to charge.It is to be set on the outside of flue gas pretreater on the outside of electron spray auxiliary coring area 3
Set electrospray system 4；Each capillary atomizer 9 provides fluid flow by micrometeor syringe pump 8；Each capillary atomizer
9 carried out by HV generator it is charged.Micrometeor syringe pump 8 for flow quantity in some specific qV0Within, and according to cigarette
Tolerance is adjusted correspondingly；HV generator generates suitable voltage U simultaneously0；To guarantee in specific flow and electricity
Pressure generates stable cone jet stream, and mist droplet particle size maintains between hundreds of nanometers to 1-2 microns.Flue gas pretreater bottom is also
Equipped with liquid discharge outlet 6.
A kind of pretreatment unit of electron spray auxiliary fine grained coring condensation of the present invention is realized by following steps
Particle is grown up:
Flue gas with certain temperature is entered into flue gas pretreater from gas inlet 5, while electrospray system 4 being opened
It opens, the electrification mist of several hundred nanometers and submicron order is dripped and sprays into electron spray auxiliary coring area 3.Mist is dripped in higher flue gas shadow
It rings lower generate and evaporates and generate a coulomb Fragmentation Phenomena, form the ultra-fine charged drop between 50 nanometers to 300 nanometers.Charged drop
Surface have charge (generally negative electrical charge, load electricity generate atomization it is preferable), under the action of electric image power rapidly combine
The surface of grain object, forms coronal liquid embryos.While flue gas enters flue gas pretreater, steam entry 10 is inputted
Water recovery area 2 and can be realized the region formed water vapour be in hypersaturated state.Due to assisting coring in electron spray
Area 3 has been partially completed the pressure nucleating course of surface particles, water vapour containing in flue gas in water recovery area 2
Some fine particle surfaces will quickly form water membrane, and fine grained is made to grow up into dust-laden drop.Obviously, it is assisted in electron spray
The droplet for the tens nanometer grade that coring area 3 generates, the nucleating course of particle is enhanced under the action of electric image power, improves coring
Rate reaches effective removing of traditional cleaner to accelerate droplet growth process and rate of growing up in subsequent condensation vapor area 2
Partial size.
The technical means disclosed in the embodiments of the present invention is not limited only to technological means disclosed in above embodiment, further includes
Technical solution consisting of any combination of the above technical features.
Claims (6)
1. a kind of pretreatment unit of electron spray auxiliary fine grained coring condensation, it is characterised in that: placed vertically including one
Flue gas pretreater；Flue gas pretreater bottom is equipped with gas inlet, and top is equipped with exhanst gas outlet, gas inlet, exhanst gas outlet
Center line be overlapped with the center line of flue gas pretreater；Area in flue gas pretreater, between gas inlet and exhanst gas outlet
Domain has electron spray to assist coring area, condensation vapor area, and wherein in the top in electron spray auxiliary coring area, flue gas is pre- in condensation vapor area
The outside for the treatment of column is equipped with electrospray system, and condensation vapor area bottom sides are equipped with steam inlet；Electron spray assists coring area
The left and right sides is equipped with capillary nozzle；Micrometeor syringe pump and high-pressure electrostatic in the capillary nozzle connection electrospray system
Generator, flue gas pretreater bottom are equipped with liquid discharge outlet.
2. a kind of pretreatment unit of electron spray auxiliary fine grained coring condensation according to claim 1, it is characterised in that: institute
The side for stating electron spray auxiliary coring area is equipped with capillary nozzle, and the quantity of the capillary nozzle is 3-6 pairs；Each capillary spray
Height of the mouth apart from flue gas pretreater bottom is equal and assists coring area peripheral wall surface equidistantly distributed along electricity, a pair of each other
Capillary atomizer is relative to flue gas pretreater center line central symmetry.
3. a kind of pretreatment unit of electron spray auxiliary fine grained coring condensation according to claim 2, it is characterised in that: institute
State the center line of the central axis flue gas pretreater of capillary nozzle；The internal diameter of capillary nozzle 0.10-0.50mm it
Between.
4. a kind of pretreatment unit of electron spray auxiliary fine grained coring condensation according to claim 3, it is characterised in that: institute
The partial size of capillary nozzle atomization generation is stated between 100 nanometers to 2 microns.
5. a kind of pretreatment unit of electron spray auxiliary fine grained coring condensation according to claim 4, it is characterised in that: institute
Stating Charged Droplet between 100 nanometers to 2 microns, in flue-gas temperature field action to issue raw coulomb broken, and generates 50 nanometers extremely
Subtleer Charged Droplet between 300 nanometers.
6. a kind of preprocess method of the pretreatment unit of electron spray auxiliary fine grained coring condensation according to claim 1,
Characterized in that it comprises the following steps:
(1) prepare pretreatment unit；
(2) dust-laden particle is inputted into flue gas pretreater, while opens electrospray system, vapor is inputted into condensation vapor area,
And reach satiety in the electrification mist drop in flue gas between 50 nanometers to 300 nanometers of generation and the vapor in condensation vapor area
And state；
(3) coring area is assisted in electricity, the electrification mist drop between 50 nanometers to 300 nanometers is adsorbed under the action of electric image power
The surface of grain forms coronal liquid embryos.
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| CN201811562931.5A CN109622224A (en) | 2018-12-20 | 2018-12-20 | A kind of pretreatment unit and method of the fine grained coring condensation of electron spray auxiliary |
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| CN201811562931.5A CN109622224A (en) | 2018-12-20 | 2018-12-20 | A kind of pretreatment unit and method of the fine grained coring condensation of electron spray auxiliary |
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| CN110711475A (en) * | 2019-11-30 | 2020-01-21 | 湖南玉道环保科技有限公司 | Environment-friendly smoke treatment device and method |
| CN111474092A (en) * | 2020-04-27 | 2020-07-31 | 安徽工业大学 | Experimental method for researching nucleation characteristic of steam on surface of fine particles |
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