阅读说明：本技术 一种多级声场耦合多通道捕集细颗粒的装置或方法 (Device or method for trapping fine particles by multi-stage sound field coupling multi-channel ) 是由 乔正辉 梁绍华 潘效军 毕小龙 张思文 王娟 时苏雅 王彦文 赵冰钰 于 2019-09-23 设计创作，主要内容包括：本发明公开了一种多级声场耦合多通道捕集细颗粒的装置或方法,包括与声场发生装置相连通的排布多列的多通道排管,含细颗粒空气首先进入声场发生装置,再进入与声场发生装置相通的多通道排管；通道的直径小于波导管的直径,并且满足通道中流体流速大于0.1 m/s,通道用于附着或吸附管内流经空气中的细颗粒。通道内壁面上具有多个共振器型小孔,工作时,利用空气在共振器内的振动,使小孔便于收集流经通道内空气中的细颗粒。本发明把声波团聚和多排细管相结合,先使小颗粒团聚长大,再借助管道内气流湍流导颗粒发生的横向惯性运动,最终由多排细管内壁面捕集。(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 0.1 m/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.)

1. A device for trapping fine particles by multi-stage sound field coupling and multi-channel is characterized in that: comprises a multi-channel calandria (2) communicated with a sound field generating device (1);

the multi-channel calandria (2) comprises a plurality of rows of arranged channels (21) and a bracket (22) 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 channel (22) is smaller than that of the waveguide (11), and the flow velocity of the fluid in the channel (22) is more than 0.1 m/s, and the channel (22) is used for attaching or adsorbing fine particles flowing through the air in the channel.

2. The device for multi-stage sound field coupling multi-channel fine particle capture according to claim 1, wherein: 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 a multi-channel tube bank;

the Helmholtz sound sources (12) are symmetrically arranged at two ends of the waveguide tube (11) and form a standing wave sound field in the waveguide tube;

the distance between two adjacent channels (22) communicated with any one waveguide (11) is less than a quarter wavelength;

a plurality of valves capable of independently regulating and controlling 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 exhaust pipe (2) through a flange convenient to detach, and after a large number of fine particles are collected in the channel (21), the multi-channel exhaust pipe (2) which is cleaner is convenient to detach and replace.

3. The device for multi-stage sound field coupling multi-channel fine particle capture according to claim 1, wherein: the inner wall surface of the channel (21) is provided with a plurality of Helmholtz resonator type small holes (211).

4. The device for multi-stage sound field coupling multi-channel fine particle trapping according to claim 1 or 3, wherein: 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 (21) by utilizing the vibration of the air within the Helmholtz resonator.

5. A method for capturing fine particles by multi-stage sound field coupling and multi-channel is characterized in that: the method comprises the steps of adopting a multi-stage sound field particle agglomeration strategy, combining with a multi-channel calandria, firstly agglomerating and lengthening small particles in a sound field, then leading the particles to generate transverse inertial motion by means of airflow turbulence in a pipeline, and finally trapping the particles by the inner wall surfaces of a plurality of rows of thin tubes, namely, finally trapping large particles obtained by agglomeration in the sound field 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.

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 0.1 m/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 ~ 4, a multi-stage sound field coupling multi-channel fine particle trapping device or method comprises 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 21 and a bracket 22 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 0.1 m/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 21 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.