CN110252056B - Oblique incidence ultrasonic standing wave dynamic scanning type dust-containing air purification device - Google Patents
Oblique incidence ultrasonic standing wave dynamic scanning type dust-containing air purification device Download PDFInfo
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- CN110252056B CN110252056B CN201910485308.2A CN201910485308A CN110252056B CN 110252056 B CN110252056 B CN 110252056B CN 201910485308 A CN201910485308 A CN 201910485308A CN 110252056 B CN110252056 B CN 110252056B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
- B01D47/06—Spray cleaning
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B17/00—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups
- B05B17/04—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods
- B05B17/06—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods using ultrasonic or other kinds of vibrations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
Abstract
The invention relates to an oblique incidence ultrasonic standing wave dynamic scanning type dust-containing air purification device, which comprises an air supply pipeline, an ultrasonic standing wave system and an atomization system, wherein the air supply pipeline is sequentially provided with an air flow inlet section, an ultrasonic standing wave incidence section, a spray coalescence section and an air flow outlet section; an ultrasonic standing wave system is obliquely arranged above the ultrasonic standing wave incident section and used for emitting ultrasonic waves, so that the ultrasonic waves can be reflected and superposed on the upper plane and the lower plane of the air supply pipeline in a reciprocating manner to form an ultrasonic standing wave field; the ultrasonic system realizes the up-and-down movement of a standing wave plane formed in the air supply pipeline by continuously adjusting the incident angle of ultrasonic waves in real time; the atomization system is arranged at the spray coalescence section and is used for forming fog drops at the spray coalescence section, so that the fine air particles are efficiently coalesced, settled and purified in the ultrasonic standing wave field. The invention improves the agglomeration effect of the ultrasonic standing wave and the fog drops on fine particles and enhances the purification capacity of dusty air flow.
Description
Technical Field
The invention relates to the technical field of air purification, in particular to an oblique incidence ultrasonic standing wave dynamic scanning type dust-containing air purification device.
Background
According to related researches, particle pollutants in the air, particularly fine particles with the particle size of less than or equal to 2.5 microns, not only have great threat to human health, but also can cause serious harm in high-tech fields such as chip manufacturing, precision instruments and the like, and how to efficiently and energy-saving remove the fine particle pollutants in the air supply of the air conditioner is a technical difficulty. At present, although common purification modes in air conditioning systems, such as filtration, electrostatic dust removal and the like, have been applied, due to the respective technical characteristics, the optimal use conditions are different, and obvious technical limitations exist. For example, the filtration technology has high resistance, the dust needs to be removed at regular time, and the change of the purification efficiency is obvious; the electric dust removal has insufficient purification effect on the charged particles, and is easy to generate ozone by-product harm and the like.
In order to purify fine particles in air more efficiently and energy-saving, scholars at home and abroad are also continuously and deeply exploring the efficient purification technology of fine particle pollutants. Relevant studies have shown that: by means of the sound wave agglomeration technology, agglomeration growth and settlement of fine particles can be realized, and accordingly dust-containing air is purified. Wangjie, Liujianzhi, et al, in the text "research on removing fine particles of fly ash from coal by sound wave agglomeration and combining other methods" (treatise on doctor's academic paper at Zhejiang university, 2012), use sound field to generate sound wave agglomeration effect to promote the settlement of particles after mutual collision and increase. In the study on sound field combined ultrasonic water mist enhanced filtering type dust removal performance (the master thesis of Tianjin university, 2014) of great forest force, madergang and the like, it is pointed out that if a proper amount of water mist is introduced in the sound wave agglomeration process, rigid collision between particles can be avoided, so that elastic collision adsorption is generated between the particles and mist drops, and the coagulation effect is promoted; meanwhile, the following points are pointed out: the effective collision time between the particles and the droplets is a decisive factor for the coalescence effect. Saylor, Ran et al in Improved particulate design by a combination of ultrasonic and water spectra (Journal of Aerosol Science 2014 (67): 104) indicate that after replacing common low frequency sound waves with ultrasonic waves, remarkably layered steady ultrasonic standing waves and suspension effects can appear after reflection and superposition, and fine particles and liquid drops approach and suspend to the layered standing waves simultaneously under the action of acoustic radiation force, thereby improving the agglomeration time and the agglomeration effect.
However, the existing technology for purifying air by sound agglomeration still has obvious defects, and the actual purifying effect is weak because most of the air flow carrying fine particle pollutants cannot be agglomerated without actually passing through a fixed standing wave layer, and the reason is generally considered by those skilled in the art to be caused by the original performance of sound waves. However, the inventor of the present invention finds that the reason for the weak effect is that the ultrasonic wave is commonly used as a fixed emission angle, and in the layered stable ultrasonic standing wave, only the particles in the fixed ultrasonic standing wave layer are agglomerated, so that a technology for realizing the whole-space dead-corner-free purification of the dusty gas flow in the air supply pipeline is not reported yet.
Disclosure of Invention
The invention aims to solve the technical problem of providing an oblique incidence ultrasonic standing wave dynamic scanning type dust-containing air purification device, improving the agglomeration effect of ultrasonic standing waves and fog drops on fine particles and enhancing the purification capacity of dust-containing air flow.
The technical scheme adopted by the invention for solving the technical problems is as follows: the ultrasonic standing wave dynamic scanning type dust-containing air purification device comprises an air supply pipeline, an ultrasonic standing wave system and an atomization system, wherein the air supply pipeline is sequentially provided with an air flow inlet section, an ultrasonic standing wave incident section, a spray coagulation section and an air flow outlet section; an ultrasonic standing wave system is obliquely arranged above the ultrasonic standing wave incident section and used for emitting ultrasonic waves, so that the ultrasonic waves can be reflected and superposed on the upper plane and the lower plane of the air supply pipeline in a reciprocating manner to form an ultrasonic standing wave field; the ultrasonic system realizes the up-and-down movement of a standing wave plane formed in the air supply pipeline by continuously adjusting the incident angle of ultrasonic waves in real time; the atomization system is arranged at the spray coalescence section and is used for forming fog drops at the spray coalescence section, so that the fine air particles are efficiently coalesced, settled and purified in the ultrasonic standing wave field.
The ultrasonic standing wave system comprises an ultrasonic standing wave signal generator, an ultrasonic standing wave transducer and a sound wave incidence angle regulator, wherein the ultrasonic standing wave transducer is combined and connected with the sound wave incidence angle regulator and then embedded above an ultrasonic standing wave incidence section, the ultrasonic standing wave signal generator is used for driving the ultrasonic standing wave transducer to generate and emit ultrasonic waves, and the sound wave incidence angle regulator is used for continuously regulating the angle of the ultrasonic standing wave transducer in real time so as to regulate the ultrasonic incidence angle.
The incident angle of the ultrasonic wave is larger than the critical angle of total reflection, and the critical angle of total reflection
Wherein, c1Is the speed of sound of a longitudinal wave in air, c2The velocity of longitudinal wave in the wall material of the air supply pipeline.
The atomization system comprises an ultrasonic atomization transducer, an ultrasonic atomization signal generator and a liquid supply pipeline; one end of the liquid supply pipeline is connected with the ultrasonic atomization transducer, and the other end of the liquid supply pipeline is connected with a liquid source; the ultrasonic atomization transducer is arranged above the spray coalescence section and is connected with an ultrasonic atomization signal generator; the ultrasonic atomization signal generator is used for driving the ultrasonic atomization transducer to atomize liquid flowing in through the liquid supply pipeline so as to form fog drops in the spray merging section.
The particle diameter of the fog drops generated by the atomization system is 30-50 mu m, and the atomization amount is 0-30 kg/h.
The length of the spray coalescence section meets l is more than or equal to 3 x vaWherein v isaIs the air flow speed in the air supply pipeline in unit time.
And a plurality of liquid discharge ports are uniformly formed in the bottom surface of the air supply pipeline.
The airflow outlet section is provided with a demister.
Advantageous effects
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages and positive effects:
firstly, the ultrasonic standing wave transducer realizes real-time and continuous adjustment of the ultrasonic incident angle under the dynamic action of the acoustic incident angle adjuster, and correspondingly, the ultrasonic standing wave transducer can move up and down through the ultrasonic standing wave plane superposed by reflection, so that the whole air supply pipeline space is completely scanned, the dead-corner-free acoustic agglomeration effect on particles in an air pipe is realized, and the purification effect is more remarkable. This is not comparable to existing technologies.
Secondly, the invention uses the acoustic action (acoustic radiation force) of the ultrasonic standing wave to carry out non-contact scanning purification on the dusty airflow in the air supply pipeline, the airflow does not encounter other purification components in the air supply pipeline, the internal structure of the pipeline is simple, compared with the traditional system using an efficient filter or an electrostatic dust collector, the pressure drop of the airflow is small, and the problem of pollution caused by byproducts such as ozone and the like is avoided.
Thirdly, the atomized droplets generated by the ultrasonic atomization transducer are tiny (30-50 μm), the specific surface area and the utilization rate of the droplets are remarkably improved, the formation of a large amount of atomized droplets not only improves the trapping efficiency of fine particles, but also significantly increases the collision and coagulation probability between the droplets and the fine particles under an ultrasonic standing wave field, improves the agglomeration effect of the fine particles, greatly improves the primary purification efficiency of the system, avoids multiple circulation purification of dust-containing air flow, remarkably reduces the required circulating air volume and the liquid consumption amount, and effectively reduces the energy consumption of the system.
Fourthly, compared with the traditional high-pressure spraying system, the ultrasonic atomization transducer avoids the use of a high-pressure pump with huge energy consumption, has the characteristics of small energy consumption, stability and reliability, and ensures the economical efficiency and stability of the operation of the ultrasonic atomization transducer.
Drawings
FIG. 1 is a schematic structural view of the present invention;
in the figure, 1 is an air supply pipeline; 2 is an airflow inlet section; 3 is an ultrasonic standing wave incident section; 4 is a spray coagulation section; 5 an airflow outlet section; 6 is a liquid outlet; 7 is an ultrasonic standing wave signal generator; 8 is a power supply of a sound wave incidence angle regulator; 9 is an ultrasonic atomization signal generator; 10 is a sound wave incident angle regulator; 11 is an ultrasonic standing wave transducer; 12 is an ultrasonic atomization transducer; 13 is a liquid source; 14 is a liquid feeding pump; 15 is a flow valve; 16 is a fine particulate; 17 is the liquid drop and particle coagulation body; and 18 is a demister.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
The embodiment of the invention relates to an oblique incidence ultrasonic standing wave dynamic scanning type dust-containing air purification device, which comprises an air supply pipeline 1, an ultrasonic standing wave system and an atomization system, wherein the air supply pipeline 1 is sequentially provided with an air flow inlet section 2, an ultrasonic standing wave incidence section 3, a spray coalescence section 4 and an air flow outlet section 5; an ultrasonic standing wave system is obliquely arranged above the ultrasonic standing wave incident section 3 and is used for emitting ultrasonic waves, so that the ultrasonic waves can be reflected and superposed on the upper plane and the lower plane of the air supply pipeline 1 in a reciprocating manner to form an ultrasonic standing wave field; the ultrasonic system realizes the up-and-down movement of a standing wave plane formed in the air supply pipeline 1 by continuously adjusting the incident angle of ultrasonic waves in real time; the atomization system is arranged in the spray coalescence section 4 and is used for forming fog drops in the spray coalescence section 4, so that fine air particles are efficiently coalesced, settled and purified in the ultrasonic standing wave field.
The ultrasonic standing wave system comprises an ultrasonic standing wave signal generator 7, an ultrasonic standing wave transducer 11, a sound wave incident angle regulator 10 and a sound wave incident angle regulator power supply 8, wherein the ultrasonic standing wave transducer 11 and the sound wave incident angle regulator 10 are combined and connected and then embedded above an ultrasonic standing wave incident section 3, the ultrasonic standing wave signal generator 7 is used for driving the ultrasonic standing wave transducer 11 to generate and emit ultrasonic waves, and the sound wave incident angle regulator 10 is powered by the sound wave incident angle regulator power supply 8 and is used for continuously regulating the angle of the ultrasonic standing wave transducer 11 in real time so as to regulate the incident angle of the ultrasonic waves, so that an up-scanning type ultrasonic standing wave plane without a dead angle can be generated in an air supply pipeline.
When the incident angle of the ultrasonic wave (the included angle between the incident sound wave and the normal line of the reflecting interface) is from the critical angle theta of total reflectionicChange to
During the process, the node of the formed ultrasonic standing wave can move up and down, thereby realizing the scanning type dynamic agglomeration purification of fine particles in the whole space. The specific principle of the reflection superposition standing wave is as follows: when the sound wave is obliquely incident to the wave-dense medium interface from the wave-sparse medium, when the incident angle theta is larger than or equal to the total reflectionCritical angle of incidence thetaicWhen the incident wave and the reflected wave are superposed, a standing wave is generated in the direction vertical to the interface, and the sound field of the standing wave exists in the direction depending on the incident angle thetaiPhase of
When the incident angle of the ultrasonic wave is from the critical angle theta of total reflectionicChange to
Time, phase
Will change from 0 to
Thereby achieving standing wave planes at different heights. Therefore, in this embodiment, the incident angle of the ultrasonic wave is larger than the critical angle of total reflection, which is the critical angle of total reflection
Wherein, c1Is the speed of sound of a longitudinal wave in air, c2The velocity of longitudinal wave in the wall material of the air supply pipeline.
The atomization system comprises an ultrasonic atomization transducer 12, an ultrasonic atomization signal generator 9 and a liquid supply pipeline; one end of the liquid supply pipeline is connected with the ultrasonic atomization transducer 12, and the other end of the liquid supply pipeline is connected with the liquid source 13; the liquid of the liquid source 13 can be transmitted to the ultrasonic atomization transducer 12 through a liquid supply pipeline under the control of a liquid feeding pump 14 and a flow valve 15; the ultrasonic atomization transducer 12 is arranged above the spray merging section 4 and is connected with the ultrasonic atomization signal generator 9; the ultrasonic atomization signal generator 9 is used for driving the ultrasonic atomization transducer 12 to atomize the liquid flowing in through the liquid supply pipeline so as to form mist drops in the spray merging section 4.
In order to fully mix and coagulate the fog drops generated by the ultrasonic atomization transducer 12 and the fine particles 16 in the air flow, the length of the spray coagulation section 4 should satisfy l ≥ 3va(wherein l is the length of the spray coalescence segment, vaAs the flow rate of air in the supply air duct per unit time).
When the device works, dust-containing air to be purified flows into the air supply pipeline 1 from the air flow inlet section 2, fine particles 16 in the dust-containing air flow are fully mixed with fog drops generated by the ultrasonic atomization transducer 12 in the spray merging section 4, meanwhile, ultrasonic waves generated by the ultrasonic standing wave transducer 11 positioned at the ultrasonic standing wave incidence section 3 form a dynamic scanning ultrasonic standing wave plane in the spray merging section 4 after reciprocating superposition, the fine particles 16 and the liquid drops are efficiently merged to form liquid drops with remarkably increased particle sizes and a particle merging body 17, and the liquid drops and the particle merging body are settled on the lower surface of the air supply pipeline 1 and are discharged from a plurality of liquid discharge ports 6 uniformly arranged on the bottom surface of the air supply pipeline; the clean air from which the fine particles are removed flows out of the airflow outlet section 5 of the air supply pipeline 2; while the mist droplets that may drift with the gas stream and that have not yet condensed are intercepted by the mist eliminator 18 installed in the gas stream outlet section 5.
The corresponding ultrasonic standing wave dynamic scanning adjusting process comprises the following steps: when the ultrasonic standing wave transducer 11 receives the ultrasonic signal generated by the ultrasonic standing wave signal generator 7, namely the ultrasonic wave incident angle regulator 10 is linked, under the driving of the power supply 8 of the ultrasonic wave incident angle regulator, the ultrasonic wave is obliquely incident to the air supply pipeline 1 in the ultrasonic standing wave incident section, and the periodic reciprocating adjustment of the emission angle of the ultrasonic standing wave transducer 11 is realized. Through the real-time reciprocating change of the emission angle of the ultrasonic standing wave transducer 11, the standing wave section generated in the air supply pipeline 4 can move up and down periodically, the dead-angle-free scanning type coagulation of particles and liquid drops at different heights in the spray coagulation section 4 is realized, and the purification efficiency is improved.
The corresponding liquid supply system is as follows: liquid passes through a liquid feeding pump 14 and a flow valve 15 from a liquid source 13 in sequence and then is sent into an ultrasonic atomization transducer 12 positioned above the spray coalescence section 4; the ultrasonic atomization transducer 12 is driven by the ultrasonic atomization signal generator 9 to atomize the liquid into liquid drops with the particle size of 30-50 μm, and the atomized liquid drops are fully mixed and coagulated with fine particles 16 in the dust-containing air flow in the spray coagulation section 4 of the air supply pipeline 1, then quickly settle to the bottom surface of the air supply pipeline 1 and are discharged from the liquid discharge port 6.
It is not difficult to discover that the invention combines the theory of total reflection sound field, and the ultrasonic standing wave transducer driven by the ultrasonic standing wave signal generator is arranged at the inclined angle larger than the critical angle thetaicThe ultrasonic wave is continuously incident, and the sound wave incident angle is periodically and continuously adjusted under the action of the sound wave incident angle adjuster, so that the standing wave node plane moves in an up-and-down scanning manner in the whole air supply pipeline. Meanwhile, the ultrasonic atomization transducer starts to work under the driving of the ultrasonic atomization signal generator, micro fog drops with the diameter of 30-50 microns are atomized by liquid source liquid supplied by the liquid feeding pump and are sent to the spray merging section of the air supply pipeline, at the moment, a large amount of atomized liquid drops are converged and merged with fine particles in the air at the standing wave plane under the action of acoustic radiation force, and formed large aggregates are rapidly settled to the bottom surface of the air supply pipeline and are discharged through a liquid discharge port, so that the aim of dynamically scanning and efficiently purifying the dust-containing air is fulfilled. The invention has the characteristics of no contact, less liquid consumption, small resistance, strong purification capacity and the like, and obviously improves the purification effect and the energy saving property.
Claims (8)
1. An ultrasonic standing wave dynamic scanning type dust-containing air purification device with oblique incidence comprises an air supply pipeline, an ultrasonic standing wave system and an atomization system, and is characterized in that the air supply pipeline is sequentially provided with an air flow inlet section, an ultrasonic standing wave incidence section, a spray coalescence section and an air flow outlet section; an ultrasonic standing wave system is obliquely arranged above the ultrasonic standing wave incident section and used for emitting ultrasonic waves, so that the ultrasonic waves can be reflected and superposed on the upper plane and the lower plane of the air supply pipeline in a reciprocating manner to form an ultrasonic standing wave field; the ultrasonic system realizes the up-and-down movement of a standing wave plane formed in the air supply pipeline by continuously adjusting the incident angle of ultrasonic waves in real time; the atomization system is arranged at the spray coalescence section and is used for forming fog drops at the spray coalescence section, so that the fine air particles are efficiently coalesced, settled and purified in the ultrasonic standing wave field.
2. The ultrasonic standing wave dynamic scanning type dust-containing air purification device with oblique incidence according to claim 1, wherein the ultrasonic standing wave system comprises an ultrasonic standing wave signal generator, an ultrasonic standing wave transducer and a sound wave incidence angle regulator, the ultrasonic standing wave transducer is connected with the sound wave incidence angle regulator in a combined manner and then embedded above the ultrasonic standing wave incidence section, the ultrasonic standing wave signal generator is used for driving the ultrasonic standing wave transducer to generate and emit ultrasonic waves, and the sound wave incidence angle regulator is used for continuously regulating the angle of the ultrasonic standing wave transducer in real time so as to realize regulation of the ultrasonic incidence angle.
3. The ultrasonic standing wave dynamic scanning type dust-laden air purification device of claim 1, wherein the incidence angle of the ultrasonic wave is larger than a total reflection critical angle which is larger than the total reflection critical angle
Wherein, c1Is the speed of sound of a longitudinal wave in air, c2The velocity of longitudinal wave in the wall material of the air supply pipeline.
4. The ultrasonic standing wave dynamic scanning type dust-laden air purification device of claim 1, wherein the atomization system comprises an ultrasonic atomization transducer, an ultrasonic atomization signal generator and a liquid supply pipeline; one end of the liquid supply pipeline is connected with the ultrasonic atomization transducer, and the other end of the liquid supply pipeline is connected with a liquid source; the ultrasonic atomization transducer is arranged above the spray coalescence section and is connected with an ultrasonic atomization signal generator; the ultrasonic atomization signal generator is used for driving the ultrasonic atomization transducer to atomize liquid flowing in through the liquid supply pipeline so as to form fog drops in the spray merging section.
5. The ultrasonic standing wave dynamic scanning dust-containing air purifying device with oblique incidence according to claim 1, wherein the atomizing system generates the mist with a particle diameter of 30-50 μm and an atomizing amount of 0-30 kg/h.
6. According toThe ultrasonic standing wave dynamic scanning type dust-containing air purification device with oblique incidence of claim 1, wherein the length of the spray merging section satisfies l ≥ 3 x vaWherein v isaIs the air flow speed in the air supply pipeline in unit time.
7. The ultrasonic standing wave dynamic scanning type dust-laden air purification device of claim 1, wherein a plurality of liquid discharge ports are uniformly arranged on the bottom surface of the air supply pipeline.
8. The oblique incidence ultrasonic standing wave dynamic scanning dusty air cleaning device of claim 1, wherein the airflow outlet section is provided with a mist eliminator.
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| CN111536604A (en) * | 2020-04-07 | 2020-08-14 | 东华大学 | Ultrasonic suspension solution dehumidification air conditioner |
| CN112023604B (en) * | 2020-08-04 | 2022-06-24 | 西安建筑科技大学 | Dual-band composite sound wave mist suppression method |
| CN114380360B (en) * | 2021-12-13 | 2023-10-03 | 湖南良友环境科技有限公司 | Three-dimensional electrode electrocatalytic oxidation reactor for degrading sewage and application method thereof |
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| CN103706219B (en) * | 2013-12-26 | 2015-10-07 | 浙江大学 | Acoustic agglomeration combines the devices and methods therefor that spraying synergy removes fine particulates |
| CN104815495A (en) * | 2014-02-04 | 2015-08-05 | 黄晨昱 | Water mist air purifier |
| CN108361841A (en) * | 2018-03-05 | 2018-08-03 | 四川长虹空调有限公司 | A kind of air purification method and system based on the ultrasonic water circulatory system |
| CN109011958A (en) * | 2018-09-21 | 2018-12-18 | 日昌升集团有限公司 | A kind of ultrasonic atomizatio dust pelletizing system and method |
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