CN101797462B - Device and method for mixed fluid particle coalescence - Google Patents
Device and method for mixed fluid particle coalescence Download PDFInfo
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- CN101797462B CN101797462B CN2010101322748A CN201010132274A CN101797462B CN 101797462 B CN101797462 B CN 101797462B CN 2010101322748 A CN2010101322748 A CN 2010101322748A CN 201010132274 A CN201010132274 A CN 201010132274A CN 101797462 B CN101797462 B CN 101797462B
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Abstract
The invention discloses a device and a method for mixed fluid particle coalescence, wherein an airflow pipeline is longitudinally divided into a plurality of sub-channels by at least one sub-channel clapboard so that the fluid is divided into a plurality of sub-fluids; a coalescence device is respectively arranged in each sub-channel and comprises a square frame in the sub-channel, a plurality of Z-shaped blades are fixed on the square frame, and a plurality of Z-shaped blades are longitudinally arranged along the sub-channel; the Z-shaped blades comprise plates folded in a Z shape longitudinally, both sides of the Z-shaped plates are respectively provided with a plurality of teeth, the Z-shaped blades are transversely arranged in the sub-channels, teeth at one side of each Z-shaped plate face to the coming direction of an airflow in each sub-channel, and the teeth at the other side of each Z-shaped plate are opposite to the coming direction of the airflow in each sub-channel. A plurality of small turbulent flow regions are created behind the large-size turbulent flow of the sub-flow upstream to obey the motion of the small turbulent flow, thus relative smaller particles in flue gas are coalesced for being conveniently removed.
Description
Technical field
The present invention relates to the technology of removing of molecule in a kind of flue gas, relate in particular to a kind of apparatus and method of mixed fluid particle coalescence.
Background technology
In many industrial processes, cause harmful small particle to be exhausted in the atmosphere.In these particles, generally include easily by the very little submicron particles thing of human body suction and enrichment toxic compounds.Their this toxicity be prone to the combination of being inhaled into property, caused the great attention of national governments, and formulated tough laws in succession that the discharging, particularly diameter of the particle that the control diameter be micron are less than 2.5 micron (Pm
2.5) particle.
Smaller particles is the main cause that the visibility that caused by air pollutants reduces in the atmospheric emission, and what of fine particle in the emission are the opacity of atmosphere mainly depend on.
In the prior art, there is various method to be used to from flue gas, remove flying dust and other polluter particle.In general, these methods are well suited for from air, removing bigger particle, but they are quite low for the filter efficiency of smaller particles thing, particularly for Pm
2.5Particle.
Summary of the invention
The purpose of this invention is to provide and a kind ofly can make smaller particles thing coalescence in the flue gas, thus the apparatus and method of the mixed fluid particle coalescence of conveniently removing.
The objective of the invention is to realize through following technical scheme:
The device of mixed fluid particle coalescence of the present invention; Comprise airflow line, it is characterized in that, be vertically divided into a plurality of subchannels through at least one sub-channel dividing plate in the said airflow line; Be respectively equipped with the coalescence device in each subchannel; Said coalescence device comprises the square bearer that is arranged in the said subchannel, is fixed with a plurality of Z shaped blades on the said square bearer, and said a plurality of Z shaped blades are vertically arranged along said subchannel;
Said Z shaped blade comprises the plate that longitudinally is converted into the Z font; The both sides of the plate of Z font are respectively equipped with a plurality of teeth; Said Z shaped blade lateral arrangement is in said subchannel; The tooth of the one of which side direction that air-flow comes in said subchannel, the back of tooth of the opposite side direction that air-flow comes in said subchannel.
The device of above-mentioned mixed fluid particle coalescence of the present invention is realized the method for mixed fluid particle coalescence, it is characterized in that, comprising:
At first, fluid is divided into a plurality of Arius bodies;
Afterwards, after the macroturbulence at the said Arius body upper reaches, create a plurality of microturbulences zone, make each Arius body through its microturbulence district separately, to obey the motion of microturbulence.
Technical scheme by the invention described above provides can be found out, the apparatus and method of mixed fluid particle coalescence of the present invention owing to be vertically divided into a plurality of subchannels through at least one sub-channel dividing plate in the airflow line, are divided into a plurality of Arius bodies with fluid; Be respectively equipped with the coalescence device in each subchannel, the coalescence device comprises the square bearer that is arranged in the subchannel, is fixed with a plurality of Z shaped blades on institute's framework, and a plurality of Z shaped blades are vertically arranged along said subchannel; The Z shaped blade comprises the plate that longitudinally is converted into the Z font; The both sides of the plate of Z font are respectively equipped with a plurality of teeth; Z shaped blade lateral arrangement is in subchannel, and the tooth of one of which side is the next direction of air-flow in subchannel, the back of tooth of the opposite side direction that air-flow comes in said subchannel.After the macroturbulence at the Arius body upper reaches, create a plurality of microturbulences zone, make each Arius body through its microturbulence district separately, to obey the motion of microturbulence.Enough make smaller particles thing coalescence in the flue gas, thereby conveniently remove.
Description of drawings
Fig. 1 is the structural representation of subchannel among the present invention;
Fig. 2 is the structural representation of Z shaped blade among the present invention;
Fig. 3 is the structural representation of the device of mixed fluid particle coalescence of the present invention;
Fig. 4 forms the sketch map of microvortex for the zone in the Z shaped blade among the present invention.
Among the figure:
1, subchannel dividing plate, 2, square bearer, 3, the Z shaped blade, 4, the square bearer pillar, 5, disturbing flow device, 6, electrostatic precipitator, 7, flue collector;
The width Hw of subchannel, blade be along the length L v of airflow direction, and blade is perpendicular to the width W v on the direction of air-flow, tooth depth Sa, space width Jp, the zigzag angle folding α of blade, the spacing Vs of adjacent blades.
The specific embodiment
The device of mixed fluid particle coalescence of the present invention, its preferable specific embodiment is as shown in Figure 1:
Comprise airflow line; Be vertically divided into a plurality of subchannels through at least one sub-channel dividing plate 1 in the said airflow line; Be respectively equipped with the coalescence device in each subchannel, said coalescence device comprises the square bearer 2 that is arranged in the said subchannel, is fixed with a plurality of Z shaped blades 3 on the said square bearer 2; Said a plurality of Z shaped blade 3 is vertically arranged along said subchannel, forms the small size eddy generator;
As shown in Figure 2; Z shaped blade 3 comprises the plate that longitudinally is converted into the Z font; The both sides of the plate of Z font are respectively equipped with a plurality of teeth; Said Z shaped blade 3 lateral arrangement are in said subchannel, and the tooth of one of which side is the next direction of air-flow in said subchannel, the back of tooth of the opposite side direction that air-flow comes in said subchannel.
Can be vertically divided into a plurality of subchannels through a plurality of subchannel dividing plates 1 in the airflow line, said a plurality of subchannel dividing plates 1 are arranged in parallel.Subchannel dividing plate 1 can or have the plate of through hole for solid slab.Subchannel dividing plate 1 can be battery lead plate.
The zigzag angle folding α of Z shaped blade 3 can be more than or equal to 90 °, and the shape of the tooth of Z shaped blade 3 can be in rectangle, trapezoidal, hemispherical, notch cuttype or the triangle one or more.
The width of concrete subchannel is Hw; The blade of said Z shaped blade is Lv along the length of airflow direction, is Wv perpendicular to the width on the direction of air-flow, and adjacent two Z shaped blades are along the Vs that is spaced apart of airflow direction; The tooth depth of Z shaped blade is Sa, and space width is Jp;
Vs≥Lv；Vs＝0.5Wv～8Wv；Lv＝0.5Wv～0.8Wv；Hw＝(2.5～25)Wv；Sa＝0.25Wv～2Wv；Hw＝100mm～750mm。
As shown in Figure 3, can also be provided with disturbing flow device 5 in the flue collector 6 of a side of the coalescence device direction that air-flow comes in said subchannel, form the large scale eddy generator, can also be provided with electrostatic precipitator 6 etc. in the flue collector 7 of coalescence device rear end.
The device of above-mentioned mixed fluid particle coalescence of the present invention is realized the method for mixed fluid particle coalescence, and its preferable specific embodiment is as shown in Figure 4, comprising:
At first, fluid is divided into a plurality of Arius bodies;
Afterwards, after the macroturbulence at the said Arius body upper reaches, create a plurality of microturbulences zone, make each Arius body through its microturbulence district separately, to obey the motion of microturbulence.
The macroturbulence at the said Arius body upper reaches can be that the structure of pipeline self generates, and can also initiatively generate macroturbulence at the upper reaches of Arius body.
The present invention is through an aerodynamic coalescence device that does not need the energy input; Be used for strengthening the mixing and the coalescence of the particulate pollutant in the gas flow; The coalescence device comprises the pipeline of an incoming flow, comprises one group of the same almost straight flat board in the pipeline, and flat board extends on the principal direction of air current flow; And almost be distributed in the whole pipe diameter range along the vertical pipe direction, be separated out gas channel between every group of parallel-plate; Passage is designed to the turbulent flow that disturbing flow device that one (optional) be placed on the passage upstream position promotes large scale; Have a device to be used for producing the turbulent flow of small scale in each passage, the imitated continuously blade that the edge that it is opened by a component is sharp-pointed is formed, and blade is distributed in one in the plane that the mobile principal direction of fluid is extended; In actual the use, air-flow is divided into one group of Arius body that passes respectively separately, and the turbulent flow of large scale makes the Arius body be able to pass the zone of the microturbulence in the passage separately in the Arius body, thereby makes particle obey the motion of small scale, removes Pm to reach
2.5The purpose of following molecule.Trunk line is divided into the dividing plate of Arius body, can be solid, also can process to have all can of various holes.In order to improve the validity of dedusting, dividing plate can be designed to battery lead plate.Its actual implementing does not have any difficulty technically, just needs some simple auxiliary devices.
Apparatus and method of the present invention can make solid particle reunite; With mixing or the reaction that improves the fine particle in flowing; No matter be and same yardstick or the bigger particle of other kind of introduction just to accomplish to promote gathering or being adsorbed of fine particle by bigger particle.Be mainly used in and pollute control, from air stream, remove the pollutant fine particle, but also be not limited only to this.
In the embodiment of first-selection, the present invention is mainly used in the method for aerodynamic particle caking, and wherein the particle size turbulent flow is to be used for promoting the reaction of particle and gathering, thereby makes things convenient for next step from air, to filter or other modes are got rid of particle.
Method of the present invention can promote the mixing of composition in the fluid, comprises a series of steps that in fluid, generate macroturbulence, and is divided into some Arius bodies to fluid; Device of the present invention is created a microturbulence zone that distributes at certain space in each Arius body, make each Arius body through its microturbulence district separately, with the motion of the turbulent flow of obeying small scale.
Device of the present invention comprises the pipeline that fluid flows through, and is included in a series of passage in the pipeline; Be used for being divided into the Arius body to fluid passage separately and the Arius body is flowed through; The upper reaches that are included in passage generate the method for macroturbulence; Be included in a device is set in each passage, be used for generating microturbulence nearby; In practical application, the turbulent flow of large scale makes the Arius body in each passage pass the zone of microturbulence.
Each device just in time is positioned near the central area of Arius body separately, and is made up of one group of isolated continuous blade, and blade is placed in the plane of the principal direction extension that the longshore current body flows.Blade should be placed apart, and what still distance will be enough is near, so that generate continuous microvortex district.Blade can be placed on one and be close in the flat rectangle frame, and rectangle frame is placed on the center of passage, and the principal direction that the longshore current body flows is extended.
Typical blade is elongated, and dentation shape is made at its edge and the mobile principal direction of fluid has the inclination angle, and blade possibly have the marginal portion of random sawtooth and so on.Device possibly comprise a plurality of parallel intimate flat flat boards, and the dull and stereotyped principal direction that flows along fluid is extended, and distributes along the vertical pipe direction.Passage is by adjacent dull and stereotyped separated.But, should be noted that passage is not to be come separatedly by the solids parting, possibly be the passage on the conceptual passed through respectively of each Arius body on the contrary.
One of the present invention specialize in the example, pipeline is an air duct, fluid is an industrial flow waste gas, and contains contaminant particle in the exhaust gas constituents.In this instance; The position of the micron that invention has been used little whirlpool to handle cleverly to carry in the tail gas stream and the contaminant particle of submicron-scale; Speed and track; Increased them and collided and be gathered into the bigger possibility of the particle of removal more easily each other, and increased them and had a mind to introduce bulky grain collision in the tail gas or the possibility that reflects in order to remove contamination particle.
The basic step that this flow process comprises is:
Produce the turbulent flows of large scale, yardstick is suitable in tail gas, producing the turbulent flow of macroscopic view;
Be divided into the Arius body in the passage separately to ducted flue gas stream;
Make the Arius body obey the microturbulence motion.
In the zone of microturbulence, microturbulence is along channel center's longitudinal extension, and particle is taken away and obey turbulent motion fully by turbulent fluid.Be exactly the reaction that this turbulent flow has strengthened the collision between the small particle, the result has caused their polymerization.
Above-mentioned macroturbulence is that the geometry of pipeline self causes basically, such as, the bending of well known, bifurcated, contraction and sudden expansion etc.But, if there are not enough macroturbulence admission passages, additional macroturbulence possibly be introduced in the middle of the fluid, and additional turbulent flow produces through the thing of placing obstacles, and places cylinder or deflector such as the upstream position at heavy connection of pipe.
When turbulent fluid is divided into the Arius body of passage separately; The Arius body is also obeyed the motion of macroturbulence simultaneously, thereby the particle in the Arius body passes the microturbulence zone in the passage separately; And the obedience small scale, the turbulent motion of particle yardstick just.
Among the present invention, conventional understanding is violated in the application of this skill of microturbulence, and as you know, in the ordinary course of things, from purpose of energy saving, people always hope that the pressure in the air-flow falls as much as possible little.From such consideration, known particle hybrid system is generally all used the turbulent flow of large scale.But say that such application is to hang down usefulness as top institute.Yes, the application of microturbulence makes particle mix better, but it has brought the pressure in the moving space of tangible longshore current to fall really; And the microturbulence that the present invention generated, but be in the finite region of passage separately, thereby make pressure drop loss minimize.The turbulent flow to large scale in the fluid guarantees that the particle in each Arius body can pass the microturbulence district and obey the mixing of particle scale.
Above-mentioned microturbulence generally all is that the form with little whirlpool exists, and these little whirlpools all are to produce at the sharp-pointed place of blade edge.Preferable is that little whirlpool colourful small scale, low intensive has the ability can take away single granule completely and make it to obey the motion of microturbulence, thereby makes the more effective coalescence of particle.Small particle also can with the bulky grain coalescence in the fluid, the particle after the coalescence can the known method of easier use be got rid of from air-flow subsequently.
In another instance of specializing, a kind of or more kinds of bulky grain things are injected in the air-flow, so that reach the purpose of removing contaminant particle.When contaminant particle had contacted the bulky grain thing that is introduced into, they trended towards reacting with it or sticking with it, like this can be along with the bulky grain thing is got rid of from air-flow together.
Little contaminant particle can be taken away by the whirlpool in microturbulence zone; And big particle can not in each Arius body; Or only can on quite little degree, be affected; Remaining, the athletic meeting of the particle between small particle and bulky grain thing just causes the collision of higher frequency between them, and small particle (pollutant) is understood and the bulky grain thing is got rid of by more effective together.
Preferablely be that the stokes number of the turbulent flows of the small scale that is generated by whirlpool is to select meticulously, makes that little contaminant particle can big then can not of accompany movement.Particularly; Fine particle can guarantee that much smaller than 1 stokes number it is carried (St＜＜1) fully by little whirlpool; Bigger particle should have the stokes number (St＞＞1) much larger than 1 in the removal, so that they can not carried, in particle; The yardstick that generates the whirlpool in the air-flow all is controlled in 10mm basically, certainly neither be absolute.
Specific embodiment:
Referring to Fig. 1, this is the plane of a sub-channel again, and therefrom we can recognize how the basic structure of microvortex generator arranges with it.The general requirement: Vs >=Lv; Vs=0.5Wv～8Wv; Lv=0.5Wv～0.8Wv; Hw=(2.5～25) Wv; Sa=0.25Wv～2Wv;
The width Hw of subchannel also possibly be in 100mm to 750mm, both can decide according to the flue collector size.Design principle is: confirm that at first Wv, other geometric parameter just can confirm, or the width Hw that confirms subchannel earlier also can.
Again referring to Fig. 2, be one to produce the blade sketch map of small scale vortex, strict restriction not on the shape theory of blade edge uncinus, can be hemispheric, notch cuttype and triangular form or the like.The α angle of its Z font is greater than 90 ° for well.
Referring to Fig. 4, fairly obvious again, turbulence vortex is formed in the tail of burst and protuberance of blade 3.Obtain comprising the wide Wv of blade, the long Lv of blade, tooth depth Sa and space width Jp through such designing institute at the very approaching drawingdimension that takes place of the yardstick in most of whirlpool.Importantly careful the selection made that by the spacing Vs of the blade of arranging continuously the zone in blade can form microvortex fully.
Turbulent flow both microvortex zone can be looped around on the entire path of particle flow, and both the diversified microvortex of vane group generation should traverse in the whole subchannel.Yet, though vane group can by gathered the guiding flue gas flue in, need be with very intensive not being placed in flue or other conduits of blade.
Therefore, in the device of specializing, making the structure that generates required yardstick turbulent flow can be designed and install as follows:
Use equation: St=Tp/Tb=PPUdp2/18PL ... (1)
After in case particle critical dimension is determined, just can carries out Stokes and analyze because the St number can be by artificial setting, and in RANS (1) except whirlpool size L, every other parameter amount all is constant (both by the hypothesis assignment).
Use an iterative process to confirm the yardstick (L) in the whirlpool of optkmal characteristics:
Its method is: use the size of the size L in the fixed whirlpool of said method and the particle that is collected detect the size that is collected particle detect be collected particle the St number (to low slippage particle St＜＜1; High slippage particle St＞＞1). use the size L in the whirlpool of confirming and the response that St=1 detects intermediate particle.
The size L in adjustment whirlpool is to obtain best particle response.
The size in optimum whirlpool is seldom generally speaking, and mainly is the magnitude at 10mm～15mm, but it also depends on the kind that is collected particle and their correlation properties.
Step 5, blade with optimum size and shape of design, in order to the whirlpool of size definite in the manufacturing step 4, first-selected blade shape should be hemispheric.
If be necessary, one experimental " form factor " can be used to revise aspheric particle.Because of the physical attribute of system, each important size of the determined blade of equipment condition of work can be a scope.Yet generally speaking, individual each variable (Wv, Lv, Vs, Jp and Sa) will determine the size of the scale of turbulence of manufacturing, shape, intensity and frequency, and these attributes of turbulent flow will further determine the wherein slippage of individual particle and the degree of collision.So, the size of blade be most important design parameter at interval.
Make to take place between particle abundant interaction then each particle when passing device, all live through primary collision (The more the better) at least.Concerning particle, this just requires on their flow directions and the flow direction perpendicular to them, a large amount of blades is arranged.Perpendicular to a large amount of blades of particle flow direction is in order to guarantee that not having particle does not have the zone of turbulence vortex to pass around blade, and a large amount of blades on their flow directions be have in order to ensure mobile in device sufficient time the chien shih particle collision of mass efficient can take place.
In concrete equipment; Thereby time of staying that the device length on the flow direction enough guarantees to have in the subchannel of air-flow in this device 0.2s at least by its processing; For typical 10m/s industrial gas, this just requires on the flow direction of device 1 foot dark (1 foot=30.5 centimetres) to be arranged at least.The angle that vane group is placed not is the tight value of defining, and it can be a level, some angles vertical or between the two.
In a word; Advantage of the present invention can design and can satisfy the mixing apparatus that particle is used, and more particularly, can obtain the turbulent flow of required yardstick; Make the small particle diameter contamination particle to be absorbed by the whirlpool fully, and bulky grain very gently or is not received their influence by the degree that these whirlpools suck.Bulky grain more collides with different having brought between them of short grained sliding velocity and track as a result.Therefore, two kinds of particles have more interaction (collision is sticked, absorption, absorption and chemical reaction) to increase the removal efficiency of contamination particle.
The above; Be merely the preferable specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, any technical staff who is familiar with the present technique field is in the technical scope that the present invention discloses; The variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.
Claims (9)
1. the device of a mixed fluid particle coalescence; Comprise airflow line, it is characterized in that, be vertically divided into a plurality of subchannels through at least one sub-channel dividing plate in the said airflow line; Be respectively equipped with the coalescence device in each subchannel; Said coalescence device comprises the square bearer that is arranged in the said subchannel, is fixed with a plurality of Z shaped blades on the said square bearer, and said a plurality of Z shaped blades are vertically arranged along said subchannel;
Said Z shaped blade comprises the plate that longitudinally is converted into the Z font; The both sides of the plate of Z font are respectively equipped with a plurality of teeth; Said Z shaped blade lateral arrangement is in said subchannel; The tooth of the one of which side direction that air-flow comes in said subchannel, the back of tooth of the opposite side direction that air-flow comes in said subchannel;
Said subchannel dividing plate is a battery lead plate.
2. the device of mixed fluid particle coalescence according to claim 1 is characterized in that, is vertically divided into a plurality of subchannels through a plurality of subchannel dividing plates in the said airflow line, and said a plurality of subchannel dividing plates are arranged in parallel.
3. the device of mixed fluid particle coalescence according to claim 2 is characterized in that, said subchannel dividing plate is solid slab or the plate that has through hole.
4. the device of mixed fluid particle coalescence according to claim 1 is characterized in that, the zigzag angle folding of said Z shaped blade is more than or equal to 90 °.
5. the device of mixed fluid particle coalescence according to claim 4 is characterized in that, the tooth of said Z shaped blade be shaped as in rectangle, trapezoidal, hemispherical, notch cuttype or the triangle one or more.
6. the device of mixed fluid particle coalescence according to claim 4; It is characterized in that the width of said subchannel is Hw, the blade of said Z shaped blade is Lv along the length of airflow direction; Perpendicular to the width on the direction of air-flow is Wv; Adjacent two Z shaped blades are along the Vs that is spaced apart of airflow direction, and the tooth depth of Z shaped blade is Sa, and space width is Jp;
Vs≥Lv；Vs＝0.5Wv～8Wv；Lv＝0.5Wv～0.8Wv；Hw＝(2.5～25)Wv；Sa＝0.25Wv～2Wv；Hw＝100mm～750mm。
7. according to the device of each described mixed fluid particle coalescence of claim 1 to 6, it is characterized in that a side of the said coalescence device direction that air-flow comes in said subchannel is provided with disturbing flow device.
8. the device of each described mixed fluid particle coalescence of claim 1 to 6 is realized the method for mixed fluid particle coalescence, it is characterized in that, comprising:
At first, fluid is divided into a plurality of Arius bodies;
Afterwards, after the macroturbulence at the said Arius body upper reaches, create a plurality of microturbulences zone, make each Arius body through its microturbulence district separately, to obey the motion of microturbulence.
9. the device of the described mixed fluid particle coalescence of claim 7 is realized the method for mixed fluid particle coalescence, it is characterized in that, comprising:
At first, fluid is divided into a plurality of Arius bodies;
Then, initiatively generate macroturbulence at the upper reaches of said Arius body;
Afterwards, after the macroturbulence at the said Arius body upper reaches, create a plurality of microturbulences zone, make each Arius body through its microturbulence district separately, to obey the motion of microturbulence.
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| CN102000472B (en) * | 2010-10-08 | 2013-03-20 | 北京大学 | Device and method for accelerating particulate matter to interact with each other |
| CN102430478A (en) * | 2011-08-26 | 2012-05-02 | 浙江菲达脱硫工程有限公司 | Device and method for removing PM 2.5 from smoke |
| CN106178612A (en) * | 2015-05-28 | 2016-12-07 | 隋原 | The polymerization of fine particle that a kind of is carried by medium fluid the device separated with former medium fluid, system and method |
| CN105855045B (en) * | 2016-05-20 | 2018-05-11 | 武汉大学 | Regulatable turbulent flow produces whirlpool superfine particulate matter coalescence device |
| CN108043163B (en) * | 2017-12-13 | 2019-08-09 | 华中科技大学 | A kind of control system and its intelligent control method removing fine particle |
| CN114797290B (en) * | 2022-04-06 | 2024-01-23 | 常州大学 | Step array longitudinal vortex dust fog coalescence system |
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