CN110639308B - Device or method for trapping fine particles by multi-stage sound field coupling multi-channel - Google Patents
Device or method for trapping fine particles by multi-stage sound field coupling multi-channel Download PDFInfo
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- CN110639308B CN110639308B CN201910899160.7A CN201910899160A CN110639308B CN 110639308 B CN110639308 B CN 110639308B CN 201910899160 A CN201910899160 A CN 201910899160A CN 110639308 B CN110639308 B CN 110639308B
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- 239000010419 fine particle Substances 0.000 title claims abstract description 29
- 230000008878 coupling Effects 0.000 title claims abstract description 12
- 238000010168 coupling process Methods 0.000 title claims abstract description 12
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 12
- 238000000034 method Methods 0.000 title claims abstract description 11
- 239000002245 particle Substances 0.000 claims abstract description 21
- 238000005054 agglomeration Methods 0.000 claims abstract description 8
- 230000002776 aggregation Effects 0.000 claims abstract description 8
- 239000012530 fluid Substances 0.000 claims abstract description 4
- 230000000694 effects Effects 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 239000011148 porous material Substances 0.000 abstract 2
- 210000005239 tubule Anatomy 0.000 abstract 2
- 239000008187 granular material Substances 0.000 description 6
- 239000002105 nanoparticle Substances 0.000 description 5
- 238000003491 array Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000000428 dust Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- SAPGTCDSBGMXCD-UHFFFAOYSA-N (2-chlorophenyl)-(4-fluorophenyl)-pyrimidin-5-ylmethanol Chemical compound C=1N=CN=CC=1C(C=1C(=CC=CC=1)Cl)(O)C1=CC=C(F)C=C1 SAPGTCDSBGMXCD-UHFFFAOYSA-N 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005367 electrostatic precipitation Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000001926 trapping method Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D49/00—Separating dispersed particles from gases, air or vapours by other methods
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
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Abstract
The invention discloses a device or a method for capturing fine particles by multi-stage sound field coupling multi-channel, which comprises a plurality of rows of multi-channel exhaust pipes communicated with a sound field generating device, wherein air containing fine particles firstly enters the sound field generating device and then enters the multi-channel exhaust pipes communicated with the sound field generating device; the diameter of the channel is smaller than that of the waveguide, and the flow velocity of the fluid in the channel is more than 0.1m/s, and the channel is used for attaching or adsorbing fine particles flowing through air in the channel. The inner wall surface of the channel is provided with a plurality of resonator type pores, and during operation, the pores are convenient for collecting fine particles in air flowing through the channel by utilizing the vibration of the air in the resonator. The invention combines the sound wave agglomeration with a plurality of rows of tubules, firstly agglomerates small particles to grow, and finally traps the particles by the inner wall surfaces of the plurality of rows of tubules by means of transverse inertial motion generated by airflow turbulence guide particles in the pipeline.
Description
Technical Field
The invention relates to a device or a method for trapping fine particles by coupling a multi-stage sound field and a multi-channel, belonging to the field of thermal energy engineering.
Background
The capture of fine particles in flue gas of coal-fired power plants is an important challenge in the field of thermal energy engineering and also belongs to important contents of atmospheric pollutant treatment and environmental protection. Electrostatic precipitation has a great trapping efficiency for small particles of 2.5-10 μm, but has a limited trapping effect for nanoparticles. Although the total mass of nanoparticles emitted by current dust removal techniques is small, the number is large. For example, a 1 μm particle in a combustion process may produce 1000 small particles of 1 nm. If these nanoparticles are suspended in the atmosphere, they inevitably become condensation nuclei that induce the generation of atmospheric haze particles when atmospheric environmental conditions are concerned.
The current research shows that the sound field, particularly the standing wave field, can generate obvious mobility control on the nano particles, the sound wave agglomeration has obvious promotion effect on the growth of the nano particles, and the development of the near zero emission technology of a power plant is greatly facilitated. However, the development of sonic dust removal technology still faces challenges.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects of the prior art, the invention provides a device or a method for capturing fine particles by multi-stage sound field coupling and multi-channel, which combines multiple rows of thin tubes and a multi-stage sound wave agglomeration process to realize the complete capture of the fine particles.
The technical scheme is as follows: in order to achieve the purpose, the invention adopts the technical scheme that:
a device or a method for capturing fine particles by multi-stage sound field coupling and multi-channel comprises a multi-channel tube bank communicated with a sound field generating device;
the multi-channel calandria comprises a plurality of rows of arranged channels and a bracket for fixing the plurality of rows of channels;
the air containing fine particles firstly enters a sound field generating device and then enters a multi-channel calandria communicated with the sound field generating device;
the diameter of the channel is smaller than that of the waveguide, and the flow velocity of the fluid in the channel is more than 0.1m/s, and the channel is used for attaching or adsorbing fine particles flowing through air in the channel.
The sound field generating devices comprise waveguide tubes and Helmholtz sound sources, and two adjacent independent sound field generating devices are communicated through a multi-channel exhaust pipe;
the Helmholtz sound sources are symmetrically arranged at two ends of the waveguide tube, and a standing wave sound field is formed in the waveguide tube;
the distance between two adjacent channels communicating with any one of the waveguides is less than a quarter wavelength.
A plurality of valves capable of independently regulating and controlling the air quantity entering the pipelines are arranged in a plurality of middle pipelines of the sound field generating device communicated with the multi-channel calandria;
the sound field generating device is connected with the multi-channel exhaust pipe through the flange convenient to detach, and the cleaner multi-channel exhaust pipe is convenient to detach and replace after a large number of fine particles are collected in the channel.
Preferably, the channel has a plurality of Helmholtz resonator type orifices in an inner wall surface thereof.
Preferably, the size parameter of the Helmholtz resonator type small hole meets the condition that the designed Helmholtz resonance frequency is equal to the frequency of the sound wave output by the Helmholtz sound source;
in operation, the Helmholtz resonator-type orifice facilitates the collection of fine particles from air flowing through the passage by utilizing the vibration of the air within the Helmholtz resonator.
Has the advantages that: the invention adopts a multi-stage sound field particle agglomeration strategy and is combined with a multi-channel calandria, so that large particles obtained by agglomeration in a sound field are finally trapped in thin tubes of the multi-channel calandria. The air flows through the multichannel calandria front and back because the multichannel calandria is to the entrapment effect of granule, and the granule of main size can change in the air, because have two independent sound field generating device around the multichannel calandria, makes things convenient for sound field generating device to adopt different frequency and acoustic pressure control to the small granule of equidimension not.
Drawings
FIG. 1 is a schematic diagram of an apparatus for multi-stage sound field coupling multi-channel fine particle capture according to an embodiment of the present invention;
fig. 2 is a schematic view of a multi-channel gauntlet according to an embodiment of the present invention;
FIG. 3 is a schematic view of the multi-channel tube array of an embodiment of the present invention having a plurality of Helmholtz resonator type orifices in the inner wall surface of the channels;
figure 4 is a schematic diagram of a Helmholtz resonator type aperture of an embodiment of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
As shown in fig. 1 to 4, a multi-stage sound field coupling multi-channel fine particle trapping device or method includes a multi-channel row pipe 2 communicated with a sound field generating device 1;
the multi-channel calandria 2 comprises a plurality of rows of channels 22 and a bracket 21 for fixing the plurality of rows of channels;
the air containing fine particles firstly enters a sound field generating device and then enters a multi-channel calandria 2 communicated with the sound field generating device;
the diameter of the passage 22 is smaller than that of the waveguide 11, and it is satisfied that the flow velocity of the fluid in the passage 22 is larger than 0.1m/s, and the passage 22 is used for attaching or adsorbing fine particles flowing through the air in the pipe.
The sound field generating devices 1 comprise wave guide tubes 11 and Helmholtz sound sources 12, and two adjacent independent sound field generating devices 1 are communicated through multi-channel tube arrays;
wherein, the Helmholtz sound source 12 is symmetrically arranged at two ends of the waveguide tube 11 and forms a standing wave sound field in the waveguide tube;
the distance between two adjacent channels 22 communicating with any one of the waveguides 11 is less than a quarter wavelength.
Wherein, a plurality of valves which can independently regulate and control the air quantity entering the pipeline 22 are arranged on a plurality of middle pipelines of the sound field generating device 1 communicated with the multi-channel calandria 2;
the sound field generating device 1 is connected with the multi-channel calandria 2 through a flange convenient to detach, and after a large number of fine particles are collected in the channel 21, the cleaner multi-channel calandria 2 is convenient to detach and replace.
Wherein the inner wall surface of the passage 21 has a plurality of Helmholtz resonator type apertures 211.
The size parameter of the Helmholtz resonator type small hole 211 meets the condition that the designed Helmholtz resonance frequency is equal to the frequency of the sound wave output by the Helmholtz sound source;
in operation, the Helmholtz resonator-type orifice facilitates the collection of fine particles from the air flowing through the passage 22 by utilizing the vibration of the air within the Helmholtz resonator.
The device manufacturing basis and the particle trapping method are as follows: a particle agglomeration strategy in a multistage sound field is adopted and is combined with a multi-channel calandria, small particles are firstly agglomerated in the sound field to be long and large, then the particles are subjected to transverse inertial motion by means of airflow turbulence in a pipeline, and finally are trapped by the inner wall surfaces of a plurality of rows of thin tubes, namely, large particles obtained by agglomeration in the sound field are finally trapped in the thin tubes of the multi-channel calandria. The air flows through the multichannel calandria front and back because the multichannel calandria is to the entrapment effect of granule, and the granule of main size can change in the air, because have two independent sound field generating device around the multichannel calandria, makes things convenient for sound field generating device to adopt different frequency and acoustic pressure control to the small granule of equidimension not.
Fig. 1 shows a multi-stage sound field coupling multi-channel fine particle trapping device, wherein three independent sound field generating devices 1 are communicated with two independent multi-channel tube arrays 2 at intervals, and the two independent multi-channel tube arrays 2 are very similar.
Fig. 2 shows another multi-channel row of three separate sound field generating devices, wherein the ducts 22 at the inlet side of the sound field generating device 1 at the intermediate position and the ducts 22 at the outlet side of the sound field generating device 1 are arranged in a centrosymmetric arrangement around the center of the sound field generating device.
Fig. 3 is a schematic view of the multi-channel tube-row having multiple Helmholtz resonator type small holes on the inner wall surface of the channel, in which the multiple Helmholtz resonator type small holes 221 are symmetrically arranged on the inner wall surface of the tube to form a porous medium cavity, and the air medium in the small holes will contract or expand to vibrate during operation to trap small particles in the tube.
Fig. 4 is a schematic diagram of a Helmholtz resonator type aperture of an embodiment of the present invention, wherein the Helmholtz resonator type aperture includes a through hole 2211 and a cavity 2212, and the size of the through hole 2211 is smaller than the size of the cavity 2212.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (3)
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910899160.7A CN110639308B (en) | 2019-09-23 | 2019-09-23 | Device or method for trapping fine particles by multi-stage sound field coupling multi-channel |
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| CN201910899160.7A CN110639308B (en) | 2019-09-23 | 2019-09-23 | Device or method for trapping fine particles by multi-stage sound field coupling multi-channel |
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| CN110639308B true CN110639308B (en) | 2021-09-21 |
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| CN112461719B (en) * | 2020-11-19 | 2022-11-18 | 南京工程学院 | Non-uniform sound field testing method for main particle size of wide-screening particles |
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| GB460795A (en) * | 1935-03-09 | 1937-02-04 | Brandt Otto | Process and apparatus for separating suspended particles |
| DE19846115A1 (en) * | 1998-10-07 | 2000-04-20 | Daimler Chrysler Ag | Diesel particle removal apparatus for diesel exhaust fumes, comprises sound source with standing wave discharging through outlet pipes |
| CN103933822A (en) * | 2014-04-29 | 2014-07-23 | 中国人民解放军国防科学技术大学 | Resonant cavity type sound agglomeration system and method for treating suspended particles |
| CN105381672B (en) * | 2015-10-22 | 2017-04-12 | 东南大学 | Device for migrating suspended particulate matters through photo-acoustic coupling |
| CN106121777B (en) * | 2016-05-24 | 2018-07-06 | 东南大学 | A kind of Fractions of Diesel Engine Exhaust Particulates pollutant catabolic gene devices and methods therefor |
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