CN207463789U - A kind of gas-solid combination orientation afflux dust exhaust apparatus - Google Patents
A kind of gas-solid combination orientation afflux dust exhaust apparatus Download PDFInfo
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- CN207463789U CN207463789U CN201721488198.8U CN201721488198U CN207463789U CN 207463789 U CN207463789 U CN 207463789U CN 201721488198 U CN201721488198 U CN 201721488198U CN 207463789 U CN207463789 U CN 207463789U
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Abstract
The utility model is related to a kind of gas-solids to combine orientation afflux dust exhaust apparatus, including at least one afflux dust hood, the collecting cover can be horizontal, vertical or lateral arrangement, positioned at the top of pollution sources or side, further include air curtain playpipe, the air curtain playpipe is set at least one dust hood side, both sides or surrounding, the air curtain playpipe is equipped with fumarole, the fumarole forms air curtain to the suction inlet jet of the narrow slit suction inlet of the collecting cover or tubaeform suction inlet or other setting shapes, barrier air curtain upper air is inhaled into, controlled flow field forms the air-flow that aggregation movement is oriented to set flow velocity to center suction inlet below the air curtain.The utility model has been obviously improved the scope of application of negative-pressure ward pollution control mode, and with preferable energy-saving potential, especially to not only must visually and manipulate but cannot improvement closed with any solid material or partially isolated pollution sources have the value of breakthrough application.
Description
Technical field
The utility model is related to a kind of orientation afflux dust exhaust apparatus, especially a kind of gas-solid combination orientation afflux dust suction dress
It puts, belongs to environment-protecting clean field.
Background technology
Dust and polluted gas loss feelings can be all generated in the operation process such as many materiel machinings, conveying, handling, heating
Condition forms environment and pollutes.Dust or gas are polluted, then pass through using capturing or constraining these by using negative-pressure ward dust hood
Qualified discharge is general method after the processing of the purifiers such as deduster.This has very ripe theory, technology and device, no
Victory is enumerated.In the case of can form closing or relative closure system, modern dedusting or other controllable pollution technologies have obtained very
Good effect.However, for a long time to much be mounted on indoor equipment or device cluster operation when can generate dust from flying or pollution
Gas diffusion, when its pollution control area is larger, palpus visual monitor, it is necessary to operate but cannot be closed or be isolated with any solid
Situation, how pollution administration is just into problem.All existed using the methods of traditional isolation, sealing, suction and be much difficult to gram
The difficulty of clothes.Typically such as, the condition or work surface for not having installation dust hood or mouth around equipment are generated and is not allow for obstacle
Object or excessive dust hood, which are difficult to realize, or suction inlet is distant leads to the difficulties such as high energy consumption.It can be seen that solve these generally existings
The problem of, there is very strong practicability, universality, thus with more great technology, economic value.
The main theory and technology that the utility model is related to arrive：1st, air curtain technical principle is well known, control dirt, noise reduction,
Shock insulation, mine control dirt, casting control dirt, metallurgy, coloured etc. have successful application；2nd, wall attachment effect is also referred to as jet effect, is
One important phenomenon of fluid motion, using very extensive；3rd, according to air jet basic theories, when air-flow is transported from certain flow rate
When dynamic, a fluid stream meeting streamwise higher than ambient air flowing velocity generates negative pressure, is transported in the same direction so as to roll up the more gases edges of suction
It is dynamic；4th, it is largely studied, tested, applied by forefathers, have found the Flow Field Distribution rule of air entry, suction inlet flow velocity constant speed line chart
Classical technology application drawing is become.5th, the dust in contaminated air, moisture, oil and gas are all needed when complex materials are in diffusion
Meet certain diffusion conditions, principal element is concentration gradient, temperature, severe etc., it is important to which its macroscopical kinetic energy (transport by average molecular
For dynamic) it is enough to overcome the resistance of the direction of motion.Therefore being rendered as it always along the small direction of resistance or has thrust, gravitation, suction
Direction moves.
Invention content
For present in above-mentioned industrial production should visual monitor and operation, and cannot use sealed solid or isolation, need
Pollution control area is larger, it is difficult to the disperse shape airborne dust of inhibition and polluted gas diffusion problem, concrete scheme provided by the utility model
It is as follows：
A kind of gas-solid combination orientation afflux dust exhaust apparatus, including at least one dust hood.The collecting cover can it is horizontal,
Vertically or lateral arrangement, positioned at the top of pollution sources or side.The gas-solid combination orientation afflux dust exhaust apparatus further includes gas
Curtain playpipe, the air curtain playpipe are set on side, both sides or the surrounding of at least one dust hood；It is set on the air curtain playpipe
There is a fumarole, the fumarole is with certain flow rate and angle to the narrow slit suction inlet or tubaeform suction inlet or other setting shapes
Suction inlet jet forms lasting air curtain, and barrier air curtain upper air is mixed into；Under the effect of negative pressure main air blower, dust hood (or mouth,
Or seam) negative pressure set on demand, flow and boundary flow velocity are produced, controlled flow field forms to set flow velocity below the air curtain
The air-flow of aggregation movement is oriented to center suction inlet so that the air of surrounding is flowed into field, and tends to suction inlet.Obviously, only
The flow velocity in this orientation flow field is wanted to be more than airborne dust or polluted gas loss speed, then controlled pollution sources cannot be to external diffusion, this
Diffusion and dust with regard to operative constraint polluted gas are flown upward, and realize pollution control environmental protection.
Further, the cover edge of the dust hood is equipped with multiple narrow slit suction inlets, and the narrow slit suction inlet is arranged at intervals, the suction
The centre of dust hood is tubaeform suction inlet, and suction inlet as needed may be designed in other shapes.
In one timing of total blast volume, this design can improve cover one's intention as revealed in what one says speed under the conditions of air quantity are waited, stablize conducive to air curtain, intermediate
Flow field can be used to have more preferably building-up effect for suction inlet.
Further, gas-guide tube is additionally provided on the fumarole, the air curtain playpipe is equipped with deflector, the water conservancy diversion
Plate can be along air curtain playpipe radial rotary.It can to increase orifice jet boundling section and prevention and control jet noise, deflector with short straight tube
To adjust the incidence angle of jet axially bored line and deflector on demand.
Further, the fumarole is uniformly distributed on air curtain playpipe, aperture 5mm, pitch of holes for 30~
120mm is accordingly adjusted according to the concrete shape of air curtain playpipe.
Further, as a preferred embodiment, the air curtain playpipe remains less than surrounding with ground or working face
Or the height of the air curtain injection tube spacing of both sides.This is controlled to be highly advantageous for improving pollution control effect and reduce energy consumption.
Further, the angle between the both sides narrow slit suction inlet of the cover edge is less than 120 °, according to the structure of dust hood, position
Adjusting is put, to adapt to the air-flow of different angles.
Further, as a preferred embodiment, the both sides air curtain playpipe is arranged in parallel or the injection of surrounding air curtain
It is tubular rectangular or round.
Further, as another preferred embodiment, the air curtain playpipe forms circle, the gas-guide tube and water conservancy diversion
Plate tilts upwards, forms the upward air-flow that is vortexed.
Further, the negative-pressure ward pollution control system of the facilities such as deduster, dedusting fan, silencer, pipe network composition is further included
System is connected.The dust hood is connect with deduster, and the deduster is connect with dedusting fan, and the dedusting fan connects with silencer
It connects.
During work, under the negative-pressure ward effect generated in dedusting fan, make the equivalent of gas-solid combination orientation afflux dust hood
Formd in diameter region by set flow velocity and in a manner of to suction inlet aggregation movement air motion, that is, produce one it is controllable
Flow field sweeps along polluted gas or dust not to make its diffusion, and it is made constantly to be discharged from suction inlet.
Compared with prior art, the beneficial effects of the utility model are as follows：
(1) for it is many not only need to be directly monitored by and operate but also cannot with sealed solid or isolation, pollution control area is larger, matches
The improvement for the pollution sources such as the dress solid dust hood scale of construction is excessive or excessively high, restricted factor is more provides a kind of solution party of effective practicality
Method and device；
(2) has diversity by the orientation afflux dust hood combination that gas-solid is composed, so as to there is stronger applicability；
Especially it can switch to change entire orientation on demand by moving air curtain tube or several groups of different modes air curtain tubes being configured simultaneously
The characteristic of the shape of collecting cover has significant effect to improving pollution control ability, reducing energy consumption.This is that solid dust hood is difficult to do
It arrives.
(3) distance (the i.e. control point distance) H of dust hood away from ground or working facexWith total exhaust air rate QpThat is, energy consumption E is in just
Correlation, gas-solid combination orientation collecting cover can more easily realize HxIt minimizes, QpOr E is optimized, and is therefore had larger energy saving latent
Power；
(4) a series of practical products can be derived based on this Method And Principle.Thus there is more significant economic value.
Description of the drawings
Fig. 1 is the structure diagram that the utility model orients afflux dust exhaust apparatus；
Fig. 2 is the vertical view that the utility model orients afflux dust exhaust apparatus；
Fig. 3-5 is that the utility model orients the schematic diagram that afflux dust exhaust apparatus forms air curtain；
Fig. 6-8 is the structural representation of the embodiment of the orientation afflux dust exhaust apparatus of the dust hood containing different shape or number
Figure；
Fig. 9-11 is the structure diagram of the embodiment of the orientation afflux dust exhaust apparatus under dust hood difference arrangement；
Figure 12 is to orient the schematic diagram that afflux dust exhaust apparatus forms the upward air-flow that is vortexed；
Figure 13 is the structure diagram for the specific example that the utility model orients afflux dust exhaust apparatus；
Figure 14 is the structure diagram for the specific example that the utility model orients afflux dust exhaust apparatus；
Figure 15 is the vertical view of the A-A of Figure 14；
Wherein, 1- dust hoods, 1.1- narrow slits suction inlet, 1.2- is tubaeform suction inlet, 2- air curtains playpipe, 2.1- gas-guide tubes,
2.2- deflectors, 3- pollution sources, 4- air curtains, 5- windstreams, 5.1- primary airs, 5.2- volumes of inspiratory flow, 5.3- boundary airs, 6-
Deduster, 7- dedusting fans, 8- silencers, 9- air curtain wind turbines.
Specific embodiment
The following is a combination of the drawings in the embodiments of the present utility model, the technical solution in the present embodiment is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only a part of example rather than the example of whole to the utility model.Base
Embodiment in the utility model, the institute that those of ordinary skill in the art are obtained under the premise of not making the creative labor
There is other embodiment, shall fall within the protection scope of the present invention.
As shown in Figs. 1-2, the gas-solid combination orientation afflux dust exhaust apparatus of the present embodiment, including a dust hood 1, the suction
The cover edge of dust hood 1 is equipped with multiple narrow slit suction inlets 1.1, and the narrow slit suction inlet 1.1 is arranged at intervals, and the centre of the dust hood is loudspeaker
Shape suction inlet 1.2, as one preferably, the angle between the both sides narrow slit suction inlet of cover edge are less than 120 °, orient afflux dust exhaust apparatus
Including air curtain playpipe 2, the air curtain playpipe 2 is set on dust hood surrounding, and the air curtain playpipe 2 is equipped with fumarole, institute
It states fumarole and forms air curtain to 1.1 jet of narrow slit suction inlet, barrier air curtain upper air is inhaled into, surrounding shape below air curtain
Into windstream.Pollution sources 3 are located at 1 lower section of dust hood, and air curtain playpipe 2 is supplied by air curtain wind turbine, dust hood 1 and deduster 6
Connection, the deduster 6 are connect with dedusting fan 7, and the dedusting fan 7 is connect with silencer 8.
As shown in figure 3, when dust hood air-breathing, an air-flow part for air curtain is inhaled by 1 edge narrow slit suction inlet 1.1 of dust hood
Enter, a part has obstructed being mixed into for cover mouth upper air along cover upper flow.If control is proper, by the air curtain of dust hood sucking
The external tolerance that tolerance can naturally be sucked with cover mouth maintains an equal level or even also lacks.Air curtain playpipe lower edge, due to the effect of jet stream
Certain volume inspiratory flow 5.2 can be generated, in the case where primary air 5.1 and volume inspiratory flow 5.2 act on, dust hood Fluid field generates oriented flow
It is dynamic, as long as 5.3 flow velocity of boundary air in velocity gradient distribution is made to be more than the diffusion velocity of dust or polluted gas, then dust or
Polluted gas is by the flow field being constrained under dust hood, and constantly discharge on demand.
As illustrated in figures 4-5, as further preferred, gas-guide tube 2.1 is additionally provided on fumarole, on the air curtain playpipe 2
Equipped with deflector 2.2, the deflector 2.2 by air curtain wind turbine 9 can be supplied and carried centainly just along 2 radial rotary of air curtain playpipe
The clean gas flow of pressure is sprayed with the flow velocity set aperture equidistant from air curtain tube through gas-guide tube 2.1, is incident at a certain angle
Relatively flat air curtain 4 is formed on deflector 2.2.Due to Coanda effects, air curtain coboundary stream has relatively high stream
Speed, and flowpiston is relatively stablized in smooth state, lower boundary stream is then in turbulent jet state, using isothermal jet (including through water conservancy diversion
Jet stream afterwards) there is the characteristic of certain angle of flare, jet hole is allow to keep enough spacing, jet stream is made to be woven into curtain, to reduce
Form air curtain required air quantity.As one preferably, fumarole is uniformly distributed on air curtain playpipe, aperture 5mm, pitch of holes
For 30~120mm.
The shape of air curtain playpipe can be adjusted according to the shape and number of dust hood, and Fig. 6-8 provides three kinds not
As shown in fig. 6, for round dust hood 1, the air curtain playpipe 2 of circular ring shape may be used in same embodiment；As shown in fig. 7, needle
To rectangle dust hood 1, the air curtain playpipe 2 of rectangle may be used；As shown in figure 8, for multiple rectangle dust hoods 1, Ke Yishe
The air curtain playpipe 2 for putting rectangle surrounds multiple rectangle dust hoods.
According to field condition, the different location of pollution sources and dust suction demand, dust hood can arrange vertically or lateral arrangement,
Positioned at the top of pollution sources or side, Fig. 9-12 provides different embodiments, as shown in figure 9, for smaller pollution sources 3,
The spray angle of air curtain playpipe 2 can be increased, reduce surrounding windstream and sucked by dust hood 1；As shown in Figure 10, dust suction
It covers 1 horizontally disposed, since wherein there is wall in side, only needs side setting air curtain playpipe 2 wherein, horn mouth is sprayed, shape
Stop into air curtain, as shown in figure 11, according to the position of dust hood 1, the spray angle of air curtain playpipe 2 can be adjusted.Such as
Shown in Figure 12, air curtain playpipe forms circle, and the gas-guide tube and deflector tilt upwards, forms the upward air-flow that is vortexed.
The method for realizing orientation afflux dust suction using above-mentioned gas-solid combination orientation afflux dust exhaust apparatus, as shown in figure 13,
Include the following steps：
Step A, intend the condition flag analysis of pollution administration source；
Step B, gas-solid combination orientation afflux dust suction mode selects；
Step C, total exhaust air rate calculates：
1. calculate air curtain generation delivery air amount QmUnit, m3/h(1)
Vm=k1 × S (2)
Or
2. calculate controlled flow field bare flow QbUnit m3/h
3. calculate total exhaust air rate QPUnit m3/h
Qp=Qb+K2Qm (8)
Wherein：
D1Center dust hood equivalent diameter；H1Center dust hood is away from ground or away from working face height；D0Work as in controlled flow field
Measure diameter；VxControlled wind speed；HxAir curtain tube is away from ground or away from working face height；S- air curtain length；θ-air curtain central ray and water
Plane included angle；QmAir curtain delivery air amount, unit m3/h；D- jet bore dias；N- jet hole counts, wherein pitch of holes are B=30
~120mm；VmEffluxvelocity, unit m/s；Vx-- controlled wind speed；
K2-sucking coefficient, K2<1.
DX- controlled wind speed VxPoint, controlled flow field equivalent diameter；
K1- air curtain wind speed VmWith the nargin coefficient of air curtain length, usual K1=1.2~1.5
Step D, according to result of calculation, adjustment parameter, starting device.
4. check constraint of the air curtain to controlled pollutant
Any height flow relocity calculation, unit m/s in controlled flow field
It can be exported according to Bernoulli equation and continuity equation：
Or
In formula：
ρ-atmospheric density；P1Originate point pressure；PRArbitrary point pressure.
VR、ARRespectively any absolute altitude mean flow rate of air curtain flow field and flow area, ξ are resistance coefficient；Any mark in formula
Eminence flow field diameter
As shown in figs. 14-15, the concrete application of the present embodiment is as follows：
Certain device cluster is fed using broken and multi-stage screening integration producing vegetable product using semi-mechanization, is sealed
Helical feed discharge method need to often be directly monitored by operating mode and be operated frequently, there is apparent dust from flying in process, if
Standby group bottom diameter 2.0m, pushes up diameter 1.0m, height 2.6m, surrounding cannot within away from working face absolute altitude 2.8m to absolute altitude 0.6m
Suction inlet and air hose is configured, also useless solid material makees the condition of sealing dust-separation processing.Design the resolution to this pollution sources, meter
It calculates total air draft Qp, air curtain air quantity Qm, the basic exhaust air rate Qb in controlled flow field, check constraint of the air curtain to controlled interior pollutant.
Step A, to the analysis of pollution sources condition flag：
Condition flag comprehensive analysis conclusion according to the pollution sources is：A, the improvement key of this pollution sources is mainly to airborne dust
The constraint of diffusion；B, negative-pressure ward dedusting method is preferably used；C, suction inlet can only be mounted in above equipment, but because suction inlet is apart from mistake
It is long, it is too high with common dust hood energy consumption and effect is bad, it is controlled it is contemplated that combining orientation afflux dust exhaust apparatus using gas-solid
Dirty prime equipment；
Step B, the selection that gas-solid combination orientation afflux dust suction mode and major parameter are chosen:
Upper suction mode is blown under, forms vertebra platform shape gas-solid combination collecting cover form；With equipment away from working face absolute altitude H1
=3.0m takes D1=1.6m as solid dust hood lower edge；Along the horizontally disposed Dx=2.3m annulars air curtain tubes of absolute altitude Hx=0.5m,
Jet bore dia d=5mm, spacing B=50mm, with noise elimination gas-guide tube and deflector；It looks into handbook and takes Vx=0.5m/s；Air curtain wind turbine
And air hose, valve, etc. on demand configuration；Deduster, dedusting fan, pipeline, silencer, system electrical control carry out Aided design.
Step C, it calculates：
1. air curtain generates delivery air amount Qm units, m3/h
When X takes some fixed value, D0=DX
In formula：N=145 (a) is taken after N=2.3 π/0.05=144.5 full circle
Vm=k1 × S
Take K1=1.25
Vm=3.155 (m/s)
Qm=32.337 (m3/h)
2. calculate controlled flow field bare flow QbUnit m3/h
Qb=8984.25 (m3/h)
3. calculate total exhaust air rate QPUnit m3/h
Qp=Qb+K2Qm=8984.25+0.8 × 32.34=9010.122 (m3/h)
K2- sucking coefficient, codomain：0.3<K2<1, K is taken in example2=0.8
4. check constraint of the air curtain to controlled pollutant
Can this step be intended to check polluted gas or dust in controlled flow field and cannot be expanded by air curtain and orientation afflux constraint
It dissipates but is constantly sucked discharge.
It can be exported according to Bernoulli equation and continuity equation：
Or
In formula：
ρ-atmospheric density；P1Originate point pressure；PRArbitrary point pressure.
VR、ARRespectively any absolute altitude mean flow rate of air curtain flow field and flow area, ξ are resistance coefficient；Any mark in formula
Eminence flow field diameter
Each data are entered formula for correlation respectively has:
DR=2.3-0.28 × (HR-0.5)
By different HRValue, which substitutes into, to be calculated, and the results are shown in Table 1：
1 difference H of tableRResult of calculation under value
Result of calculation shows shown in upper table：
In controlled flow field, flow velocity increases with any increase away from working face height HR；
VRmax=1.033 (m/s) is less than Vm=3.155 (m/s), it is seen that is combined the dust hood control of orientation afflux by gas-solid
Orientation fluid and boundary air curtain energy operative constraint polluted gas and dust diffusion.
Step D, energy-saving potential is analyzed：
By the condition of this example, in no air curtain, total exhaust air rate Qpw is calculated, wherein, Hxw=3.0 (m), Dx=2.3
(m), Vx=0.5 (m/s)
It can be seen that under the same conditions, there are the discharge capacity Qp=9010.122 (m3/h) of air curtain, the discharge capacity Qpw=of no air curtain
127108.921(m3/ h), Qpw/Qp=14.11, it is widely different to whether there is the total exhaust air rate of air curtain, and energy consumption difference is also inevitable very big,
Energy-saving potential is very big.Its main points is：Gas-solid combination orientation afflux dust hood can be greatly reduced the command range of controlled flow field,
And in the fluid for flowing polluted gas and dust operative constraint in continuously-directional.
Step E, according to result of calculation, adjustment parameter, starting device.
For ever-changing various adaptable operating modes, gas-solid combination orientation afflux dust exhaust apparatus can also be further thin
Change, such as the size of center gas gathering mask, shape, cover edge wind speed, total flow, the size of air curtain air jet pipe, equivalent diameter, jet velocity
Degree, angle, mounting height and mode etc.；And it need to be carried out with the dedusting of subsequent association or purification air or cleaning equipment, piping
With design, system peace.The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all
Within the spirit and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in this practicality
Within novel protection domain.
Claims (9)
1. a kind of gas-solid combination orientation afflux dust exhaust apparatus, including at least one afflux dust hood, it is characterised in that：The cover
Horizontal, vertical or lateral arrangement, positioned at the top of pollution sources or side；The gas-solid combination orientation afflux dust exhaust apparatus also wraps
Air curtain playpipe is included, the air curtain playpipe is set at least one dust hood side, both sides or surrounding；On the air curtain playpipe
Equipped with fumarole, the suction inlet jet of the fumarole to narrow slit suction inlet or tubaeform suction inlet or other setting shapes forms air curtain,
Barrier air curtain upper air is inhaled into, and controlled flow field is formd below the air curtain is gathered with setting flow velocity and being oriented to center suction inlet
Collect the air-flow of movement.
2. gas-solid combination orientation afflux dust exhaust apparatus according to claim 1, it is characterised in that：The afflux dust hood
Cover edge be equipped with multiple narrow slit suction inlets, the narrow slit suction inlet is arranged at intervals, and the centre of the dust hood is tubaeform suction inlet.
3. gas-solid combination orientation afflux dust exhaust apparatus according to claim 1, it is characterised in that：On the fumarole also
Equipped with gas-guide tube, the air curtain playpipe is equipped with deflector, and the deflector can be along air curtain playpipe radial rotary.
4. gas-solid combination orientation afflux dust exhaust apparatus according to claim 3, it is characterised in that：The fumarole is uniform
It is distributed on air curtain playpipe, aperture 5mm, pitch of holes 50-150mm.
5. gas-solid combination orientation afflux dust exhaust apparatus according to claim 1, it is characterised in that：The air curtain playpipe
The height for the equivalent diameter that air curtain tube surrounds is remained less than with ground or working face.
6. gas-solid combination orientation afflux dust exhaust apparatus according to claim 1, it is characterised in that：The both sides of the cover edge
Between angle be less than 120 °.
7. gas-solid combination orientation afflux dust exhaust apparatus according to claim 1, it is characterised in that：The both sides air curtain spray
Penetrate that pipe is arranged in parallel or surrounding air curtain playpipe forms rectangle or circle.
8. gas-solid combination orientation afflux dust exhaust apparatus according to claim 7, it is characterised in that：The air curtain playpipe
Circle is formed, the gas-guide tube and deflector tilt upwards, form the upward air-flow that is vortexed.
9. the gas-solid combination orientation afflux dust exhaust apparatus according to claim 1-8, it is characterised in that：Further include deduster,
Dedusting fan and silencer, the dust hood are connect with deduster, and the deduster is connect with dedusting fan, the dedusting fan
It is connect with silencer.
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| CN201721488198.8U CN207463789U (en) | 2017-11-09 | 2017-11-09 | A kind of gas-solid combination orientation afflux dust exhaust apparatus |
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| CN201721488198.8U CN207463789U (en) | 2017-11-09 | 2017-11-09 | A kind of gas-solid combination orientation afflux dust exhaust apparatus |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107838166A (en) * | 2017-11-09 | 2018-03-27 | 邝勇兴 | A kind of gas-solid combination orientation afflux dust exhaust apparatus and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107838166A (en) * | 2017-11-09 | 2018-03-27 | 邝勇兴 | A kind of gas-solid combination orientation afflux dust exhaust apparatus and method |
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