WO2023178392A1 - Method for purification of gas medium under atmospheric pressure, device for implementation of the method and ultrasonic emitter - Google Patents

Method for purification of gas medium under atmospheric pressure, device for implementation of the method and ultrasonic emitter Download PDF

Info

Publication number
WO2023178392A1
WO2023178392A1 PCT/BG2023/000003 BG2023000003W WO2023178392A1 WO 2023178392 A1 WO2023178392 A1 WO 2023178392A1 BG 2023000003 W BG2023000003 W BG 2023000003W WO 2023178392 A1 WO2023178392 A1 WO 2023178392A1
Authority
WO
WIPO (PCT)
Prior art keywords
ultrasonic
purification
electrode
voltage pulse
ultrasonic emitter
Prior art date
Application number
PCT/BG2023/000003
Other languages
French (fr)
Inventor
Kiril STOIMENOV
Original Assignee
Stoimenov Kiril
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Stoimenov Kiril filed Critical Stoimenov Kiril
Publication of WO2023178392A1 publication Critical patent/WO2023178392A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
    • B06B1/06—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction
    • B06B1/0607—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using multiple elements
    • B06B1/0611—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using multiple elements in a pile
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/01—Pretreatment of the gases prior to electrostatic precipitation
    • B03C3/016—Pretreatment of the gases prior to electrostatic precipitation by acoustic or electromagnetic energy, e.g. ultraviolet light
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/02—Plant or installations having external electricity supply
    • B03C3/04—Plant or installations having external electricity supply dry type
    • B03C3/12—Plant or installations having external electricity supply dry type characterised by separation of ionising and collecting stations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/34—Constructional details or accessories or operation thereof
    • B03C3/40—Electrode constructions
    • B03C3/41—Ionising-electrodes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/34—Constructional details or accessories or operation thereof
    • B03C3/40—Electrode constructions
    • B03C3/45—Collecting-electrodes
    • B03C3/49—Collecting-electrodes tubular
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/18—Methods or devices for transmitting, conducting or directing sound
    • G10K11/20—Reflecting arrangements

Definitions

  • the method for purification of gas medium under atmospheric pressure, in particular atmospheric air, respectively the device for implementation of the method and the ultrasonic emitter for it will find application in equipment for purification of air under atmospheric pressure wherever it is needed, including in an urban environment, for example for household and technical use, in the industry, in closed spaces such as residential and office premises, and in specialized premises or mobile objects having isolated environment where it is necessary to maintain the air pure from organic and mechanical particles.
  • EP 3778033 Al describes an ambient air purification device based on an electrostatic method for collecting particulate contaminants from the air, and a method for its control.
  • the electrostatic method comprises creating an electromagnetic field from a generating electrode and a trapping electrode oppositely arranged to each other. The method proceeds as follows: after switching on the generating electrode, a high potential difference is formed between the generating electrode and the trapping electrode, thus producing a corona discharge. The dust particles are then moved to the trapping electrode where they are collected and accumulated, thus achieving an air purification effect.
  • the trapping electrode is capable of changing its position relative to the generating electrode, and provision is also made for its being composed of a plurality of structures spaced apart.
  • Disadvantages of the known solution are that, when applying the method in an urban environment, arc discharges are possible and shielding is necessary due to the risk of electric shock. Furthermore, at high concentrations of polluting particles its efficiency is low.
  • the problem to be solved is to provide a highly efficient purification of a gas medium by avoiding the possibility of arc discharges.
  • a method for purification of a gas medium under atmospheric pressure which includes creating an electromagnetic field between two electrodes, one of them being a generating electrode and the other one being a trapping electrode.
  • a high-voltage pulse tension with a field intensity of at least 250 V/cm is applied between the electrodes and an ultrasonic field is simultaneously applied, creating a non-self-contained pulsed gas discharge, wherein water is injected into the gas discharge medium by sputtering.
  • the electromagnetic field intensity being maintained until the desired purification is achieved.
  • the high-voltage pulse tension is within the range of 10 to 30 kV.
  • the ultrasonic field has frequency of about 1MHz and power of 5 to 10 W.
  • a device is also created for implementing the method for purification of a gas medium under atmospheric pressure, which includes a generating electrode and a trapping electrode arranged opposite to each other.
  • the generating electrode is a high-voltage pulse electrode, connected to a high-voltage pulse generator, and the trapping electrode is grounded and implemented by at least one ultrasonic emitter connected via a matching unit to an adjustable DC source having an output stage to the matching unit.
  • the output stage is also coupled to a setting generator.
  • the high-voltage pulse generator is also connected through the matching unit to the setting generator.
  • a differential amplifier and a normalizing amplifier are also provided in parallel to the matching unit, and are all connected to a control block.
  • the ultrasonic emitters of the trapping electrode be spaced at least 50 mm apart.
  • control unit shall include a gas contamination measuring device.
  • control unit is provided with a display.
  • the ultrasonic emitter unit formed comprises a housing having an opening with a support, in which housing, connected to the support, a metal sound reflector package is disposed having two cylindrical piezoceramic elements fixed thereto and a half-wave emitting concentrator, extending outwardly from the housing and centrally through the opening. It consists of a tubular element with walls in a hyperbolic curve, the front end of which is formed as part of a spherical concave surface at the most concave point of which there is a nozzle opening connected to a water supply pipe centrically and longitudinally arranged throughout the package and through the housing.
  • the spherical concave surface at the front end of the half-wave emitting concentrator has a radius of 500 mm to 1000 mm.
  • the material from which the metal sound reflector and the half-wave emitting concentrator are made is kovar.
  • the material from which the metal sound reflector and the half-wave emitting concentrator are made is titanium alloy.
  • the advantages of the method devised - when applied under atmospheric pressure and especially in an urban environment - consist in avoiding the occurrence of arc discharges (atmospheric lightning), which is due to the use of a non-self-contained pulsed gas discharge.
  • the application of pulsed excitation of the gas medium allows to adjust the rate of increase of the ion concentration in the medium and to achieve balance between the shock ionisation and recombination under atmospheric pressure in highly efficient gas medium purification.
  • FIG. 1 is a block diagram of the device for implementing the method according to the invention
  • Fig. 2 is a longitudinal section of an ultrasonic emitter according to the invention.
  • Fig. 3 is a general block diagram of a manufacturing embodiment of the device according to the invention.
  • a method for the purification of a gas medium, such as atmospheric air, which method is based on creating a non-self-contained pulsed gas discharge under atmospheric pressure.
  • the method includes the following steps:
  • An electromagnetic field of at least 250 V/cm is created in the gas medium by applying a high-voltage pulse tension between electrodes, (one of them being a high-voltage pulse electrode 1 and the second one being a trapping electrode 2 which is grounded.) Simultaneously with the creation of the electromagnetic field, an ultrasonic field is applied to the gas medium, thus creating a non-self-contained pulsed gas discharge causing ionization of particles 3 commensurate with 0.001 mm and smaller.
  • water is injected into the gas medium by ultrasonic sputtering
  • the ionized particles 3 entrain other contained fine particles to the trapping electrode 2, accumulating there.
  • the method avoids electrical breakdown by applying a quasi-steady state pressure change to the gas medium through the excitation of ultrasonic waves in the ionized area.
  • the frequency of the sound field is matched to the lifetime of the ions formed.
  • the field intensity is not less than 250 V/cm, realized at a high-voltage pulse tension of 10 to 30 kV. Under these conditions the process of collection of fine particles in the ionized medium takes place. When the described process is carried out in a gas medium in a closed space, the concentration of fine particles decreases steadily. When additional contaminated gas medium, such as ambient air, from another space is introduced through the ionized area, the newly introduced air is purified as a result of the ionization process and the accumulation of fine particles, thereby significantly reducing the mass of newly introduced contaminants in the purified space.
  • additional contaminated gas medium such as ambient air
  • ultrasonic field frequency of about 1 MHz and power of about 5 - 10 W is applied.
  • a device for implementation of the method for purification of gas medium under atmospheric pressure has been designed, which puts into effect the power density of the electromagnetic field and is shown in the block diagram of Fig. 1.
  • the device includes a generating electrode and a trapping electrode 2 arranged opposite to each other.
  • the generating electrode is a high-voltage pulse electrode 1 connected to a high-voltage pulse generator 4.
  • the trapping electrode 2 is grounded and is implemented by at least one ultrasonic emitter 5, connected via a matching unit 6 to an adjustable direct current source 7 having an output stage 8 to the matching unit 6, which output stage 8 is also connected to a setting generator 9.
  • the high-voltage pulse generator 4 is also connected via the matching unit 6 to the setting generator 9.
  • a differential amplifier 10 and a normalizing amplifier 11 are also provided in parallel to the matching block 6. These are all connected to a control unit 12.
  • a gas contamination measuring device (not shown) is provided in the control unit 12 to switch the method implementation device on/off.
  • the control unit 12 has a display showing the results of the purification as well as other control information.
  • the trapping electrode 2 is composed of a plurality of ultrasonic emitters 5 arranged side by side at a distance of at least 50 mm.
  • Fig. 2 shows a longitudinal section of an ultrasonic emitter 5 designed for carrying out the method for purification of gas medium and for use in the device for carrying out the method. Irrespective of its specific purpose, it can also be used in other devices where necessary.
  • the ultrasonic emitter 5 includes a housing 13 having an opening 14 with a support 15.
  • cylindrical piezoceramic elements 17 with a total size of 028 mm and a thickness of 20 mm were used. Their specific dimensions are determined by the properties of the piezoceramic elements 17 that are used in each particular case and may vary to achieve the required frequency and power of the ultrasonic field mentioned above.
  • the half-wave emitting concentrator 18 is a tubular element with walls along a hyperbolic curve, the front end 19 of which forms part of a spherical concave surface having a radius (R) of 500 mm to 1000 mm, at the most concave point of which a nozzle opening 20 is located.
  • This nozzle opening 20 is connected to a water supply pipe 21 centrally and longitudinally disposed throughout the package and through the housing 13, as shown in Fig. 2.
  • This material may be, for example, kovar or titanium aloy.
  • the water supply tube 21 is provided for adjusting the conductivity of the gas discharge medium between the two electrodes 1, 2, which is accomplished by injecting a small amount of water into the gas discharge medium by sputtering.
  • the water pressure is provided by a micro-pump 22 (Fig. 3), which enables the waterjet to be supplied in pulses.
  • the micro-pump 22 is fed by a deionised water vessel 23.
  • the electrical supply of the ultrasonic emitter 5 has a common potential Earth with the high-voltage pulse electrode 1 and acts as a common anode.
  • the high-voltage pulse generator 4 produces positive pulses with amplitude of 30 kV and frequency of 500 - 1500 kHz, which is adjustable.
  • the distance between the high-voltage pulse electrode 1 and the trapping electrode 2 (grounded) can be varied, and in the experiments carried out it was between 500 mm and 800 mm.
  • the high-voltage pulse electrode 1 and the matching unit 6 in this example are connected to a split transformer, which allows the phase ratio of the electric and ultrasonic fields to be accurately adjusted.
  • a frame is constructed comprising a high-voltage pulse electrode column and an opposing trapping electrode column in which frame the elements of the device for implementation of the method are incorporated.
  • the frame is disposed in an open environment or in a room or, for example, in a suitable opening adjacent to outside air or in an opening between two rooms.
  • the high-voltage pulse electrode 1 and the trapping electrode 2 are connected via the control unit 12 to a respective power supply as indicated above.
  • the method for purification of ambient air is carried out via its elements, all processes taking place automatically when the device is in operation.
  • the accumulated fine particles shall be removed, where necessary, by any of the common approaches such as among other, vacuuming and washing.
  • the high- voltage pulse electrode 1 and the trapping electrode 2 are preferably arranged in shielding channels, for example with a cross-section of 100x100 mm (not shown).
  • the device set up for the implementation of the method operates as an ionization channel in a space of a gas medium, i.e., atmosphere.
  • a volume-appropriate number of devices arranged in a plane of the required calculable length are arranged. The distance between them shall be determined experimentally so as to ensure the purification of the specified volume.
  • the electrical consumption of one channel is about 220 W.

Abstract

The inventions will find application in equipment for purification of air under atmospheric pressure wherever it is needed, for example for household and technical use, in the industry, in closed spaces such as residential and office premises, and in specialized premises or mobile objects having isolated environment. Highly efficient purification of the gas environment is ensured by avoiding the possibility of arc discharges. The method includes creating an electromagnetic field between two electrodes (1) and (2), between which a high-voltage pulse tension is applied and simultaneously an ultrasonic field is applied. Also simultaneously, water is injected into the gas medium by ultrasonic sputtering, wherein the electromagnetic field intensity is maintained until the desired purification is achieved. One of the electrodes (1) is a high-voltage pulse electrode and the second one (2) is a trapping electrode which is grounded. The trapping electrode (2) is implemented by at least one ultrasonic emitter (5). A control unit (12) is also provided.

Description

METHOD FOR PURIFICATION OF GAS MEDIUM UNDER ATMOSPHERIC PRESSURE, DEVICE FOR IMPLEMENTATION OF THE METHOD AND ULTRASONIC EMITTER
TECHNICAL FIELD
The method for purification of gas medium under atmospheric pressure, in particular atmospheric air, respectively the device for implementation of the method and the ultrasonic emitter for it will find application in equipment for purification of air under atmospheric pressure wherever it is needed, including in an urban environment, for example for household and technical use, in the industry, in closed spaces such as residential and office premises, and in specialized premises or mobile objects having isolated environment where it is necessary to maintain the air pure from organic and mechanical particles.
BACKGROUND ART
EP 3778033 Al describes an ambient air purification device based on an electrostatic method for collecting particulate contaminants from the air, and a method for its control. The electrostatic method comprises creating an electromagnetic field from a generating electrode and a trapping electrode oppositely arranged to each other. The method proceeds as follows: after switching on the generating electrode, a high potential difference is formed between the generating electrode and the trapping electrode, thus producing a corona discharge. The dust particles are then moved to the trapping electrode where they are collected and accumulated, thus achieving an air purification effect. The trapping electrode is capable of changing its position relative to the generating electrode, and provision is also made for its being composed of a plurality of structures spaced apart.
Disadvantages of the known solution are that, when applying the method in an urban environment, arc discharges are possible and shielding is necessary due to the risk of electric shock. Furthermore, at high concentrations of polluting particles its efficiency is low.
DISCLOSURE OF INVENTION
The problem to be solved is to provide a highly efficient purification of a gas medium by avoiding the possibility of arc discharges.
The problem is solved by a method for purification of a gas medium under atmospheric pressure, which includes creating an electromagnetic field between two electrodes, one of them being a generating electrode and the other one being a trapping electrode. According to the invention, a high-voltage pulse tension with a field intensity of at least 250 V/cm is applied between the electrodes and an ultrasonic field is simultaneously applied, creating a non-self-contained pulsed gas discharge, wherein water is injected into the gas discharge medium by sputtering. The electromagnetic field intensity being maintained until the desired purification is achieved.
It is recommended that the high-voltage pulse tension is within the range of 10 to 30 kV. The ultrasonic field has frequency of about 1MHz and power of 5 to 10 W. A device is also created for implementing the method for purification of a gas medium under atmospheric pressure, which includes a generating electrode and a trapping electrode arranged opposite to each other. According to the invention, the generating electrode is a high-voltage pulse electrode, connected to a high-voltage pulse generator, and the trapping electrode is grounded and implemented by at least one ultrasonic emitter connected via a matching unit to an adjustable DC source having an output stage to the matching unit. The output stage is also coupled to a setting generator. The high-voltage pulse generator is also connected through the matching unit to the setting generator. A differential amplifier and a normalizing amplifier are also provided in parallel to the matching unit, and are all connected to a control block.
It is recommended that the ultrasonic emitters of the trapping electrode be spaced at least 50 mm apart.
Suitably, the control unit shall include a gas contamination measuring device.
Optionally, the control unit is provided with a display.
The ultrasonic emitter unit formed comprises a housing having an opening with a support, in which housing, connected to the support, a metal sound reflector package is disposed having two cylindrical piezoceramic elements fixed thereto and a half-wave emitting concentrator, extending outwardly from the housing and centrally through the opening. It consists of a tubular element with walls in a hyperbolic curve, the front end of which is formed as part of a spherical concave surface at the most concave point of which there is a nozzle opening connected to a water supply pipe centrically and longitudinally arranged throughout the package and through the housing.
The spherical concave surface at the front end of the half-wave emitting concentrator has a radius of 500 mm to 1000 mm.
The metal sound reflector and the half-wave emitting concentrator are made from material with low coefficient of linear temperature expansion at 20°C a = (9- 10).1 O^/K.
Suitably, the material from which the metal sound reflector and the half-wave emitting concentrator are made, is kovar.
Suitably, as an embodiment, the material from which the metal sound reflector and the half-wave emitting concentrator are made, is titanium alloy.
The advantages of the method devised - when applied under atmospheric pressure and especially in an urban environment - consist in avoiding the occurrence of arc discharges (atmospheric lightning), which is due to the use of a non-self-contained pulsed gas discharge. The application of pulsed excitation of the gas medium allows to adjust the rate of increase of the ion concentration in the medium and to achieve balance between the shock ionisation and recombination under atmospheric pressure in highly efficient gas medium purification.
BRIEF DESCRIPTION OF DRAWINGS Fig. 1 is a block diagram of the device for implementing the method according to the invention;
Fig. 2 is a longitudinal section of an ultrasonic emitter according to the invention;
Fig. 3 is a general block diagram of a manufacturing embodiment of the device according to the invention.
EXAMPLES OF THE INVENTION EMBODIMENTS
According to the invention, a method is created for the purification of a gas medium, such as atmospheric air, which method is based on creating a non-self-contained pulsed gas discharge under atmospheric pressure. The method includes the following steps:
An electromagnetic field of at least 250 V/cm is created in the gas medium by applying a high-voltage pulse tension between electrodes, (one of them being a high-voltage pulse electrode 1 and the second one being a trapping electrode 2 which is grounded.) Simultaneously with the creation of the electromagnetic field, an ultrasonic field is applied to the gas medium, thus creating a non-self-contained pulsed gas discharge causing ionization of particles 3 commensurate with 0.001 mm and smaller.
Also simultaneously, water is injected into the gas medium by ultrasonic sputtering;
- Wherein the electromagnetic field intensity is maintained until the desired purification is achieved.
As a result, the ionized particles 3 entrain other contained fine particles to the trapping electrode 2, accumulating there.
The method avoids electrical breakdown by applying a quasi-steady state pressure change to the gas medium through the excitation of ultrasonic waves in the ionized area. The frequency of the sound field is matched to the lifetime of the ions formed. When synchronization of the ultrasonic field in frequency and phase with the frequency and phase of the electric field is achieved, the required amplitude of the excitation voltage is lowered.
The field intensity is not less than 250 V/cm, realized at a high-voltage pulse tension of 10 to 30 kV. Under these conditions the process of collection of fine particles in the ionized medium takes place. When the described process is carried out in a gas medium in a closed space, the concentration of fine particles decreases steadily. When additional contaminated gas medium, such as ambient air, from another space is introduced through the ionized area, the newly introduced air is purified as a result of the ionization process and the accumulation of fine particles, thereby significantly reducing the mass of newly introduced contaminants in the purified space.
For a stable non-self-contained discharge process, ultrasonic field frequency of about 1 MHz and power of about 5 - 10 W is applied.
A device for implementation of the method for purification of gas medium under atmospheric pressure has been designed, which puts into effect the power density of the electromagnetic field and is shown in the block diagram of Fig. 1. The device includes a generating electrode and a trapping electrode 2 arranged opposite to each other. According to the invention, the generating electrode is a high-voltage pulse electrode 1 connected to a high-voltage pulse generator 4. The trapping electrode 2 is grounded and is implemented by at least one ultrasonic emitter 5, connected via a matching unit 6 to an adjustable direct current source 7 having an output stage 8 to the matching unit 6, which output stage 8 is also connected to a setting generator 9. The high-voltage pulse generator 4 is also connected via the matching unit 6 to the setting generator 9. A differential amplifier 10 and a normalizing amplifier 11 are also provided in parallel to the matching block 6. These are all connected to a control unit 12. In a preferred embodiment, a gas contamination measuring device (not shown) is provided in the control unit 12 to switch the method implementation device on/off. Suitably, the control unit 12 has a display showing the results of the purification as well as other control information.
Typically, the trapping electrode 2 is composed of a plurality of ultrasonic emitters 5 arranged side by side at a distance of at least 50 mm.
Fig. 2 shows a longitudinal section of an ultrasonic emitter 5 designed for carrying out the method for purification of gas medium and for use in the device for carrying out the method. Irrespective of its specific purpose, it can also be used in other devices where necessary. The ultrasonic emitter 5 includes a housing 13 having an opening 14 with a support 15. A metal sound reflector package 16 with two cylindrical piezoceramic elements 17 fixed thereto, and a half-wave emitting concentrator 18 extending outside the housing 13 and centrally through the opening 14, is disposed within the housing 13 connected to the support 15.
In the experiments carried out, cylindrical piezoceramic elements 17 with a total size of 028 mm and a thickness of 20 mm were used. Their specific dimensions are determined by the properties of the piezoceramic elements 17 that are used in each particular case and may vary to achieve the required frequency and power of the ultrasonic field mentioned above.
The half-wave emitting concentrator 18 is a tubular element with walls along a hyperbolic curve, the front end 19 of which forms part of a spherical concave surface having a radius (R) of 500 mm to 1000 mm, at the most concave point of which a nozzle opening 20 is located. This nozzle opening 20 is connected to a water supply pipe 21 centrally and longitudinally disposed throughout the package and through the housing 13, as shown in Fig. 2.
The ultrasonic emitter 5 is grounded, the metal sound reflector 16 and the half- wave emitting concentrator 18 being made of material with low coefficient of linear thermal expansion at 20 °C, e.g. a = (9-10).10'6/K. This material may be, for example, kovar or titanium aloy.
The water supply tube 21 is provided for adjusting the conductivity of the gas discharge medium between the two electrodes 1, 2, which is accomplished by injecting a small amount of water into the gas discharge medium by sputtering. Thus, an advanced technology of electrical sputtering and ionization of water is realized. The water pressure is provided by a micro-pump 22 (Fig. 3), which enables the waterjet to be supplied in pulses. The micro-pump 22 is fed by a deionised water vessel 23.
The electrical supply of the ultrasonic emitter 5 has a common potential Earth with the high-voltage pulse electrode 1 and acts as a common anode.
The high-voltage pulse generator 4 produces positive pulses with amplitude of 30 kV and frequency of 500 - 1500 kHz, which is adjustable. The distance between the high-voltage pulse electrode 1 and the trapping electrode 2 (grounded) can be varied, and in the experiments carried out it was between 500 mm and 800 mm. The high-voltage pulse electrode 1 and the matching unit 6 in this example are connected to a split transformer, which allows the phase ratio of the electric and ultrasonic fields to be accurately adjusted.
With the electric and ultrasonic fields thus matched, conditions are created for a combination of appropriate micro-volume pressure and instantaneous intensity of the electric field applied to the gas medium, and an initial instantaneous concentration of current carriers is created, giving rise to an ion-electron current. Ionization of the gas medium to a hot arc discharge is avoided by termination of the electrical influence, which is accomplished by the control unit 12. Synchronously, the influence of the ultrasonic field is also terminated. The medium recombines. With a delay determined by the instantaneous value of the current between the electrodes, a further process of impact and ionisation begins. The process undergoes a steady state and adjusts to quasi-stationarity.
APPLICATION OF THE INVENTION
It is envisaged that the invention will be most commonly applied in practice to the purification of the air of residential and office spaces, and other use spaces from organic and mechanical particles. In the most commonly envisioned application, a frame is constructed comprising a high-voltage pulse electrode column and an opposing trapping electrode column in which frame the elements of the device for implementation of the method are incorporated. The frame is disposed in an open environment or in a room or, for example, in a suitable opening adjacent to outside air or in an opening between two rooms. The high-voltage pulse electrode 1 and the trapping electrode 2 are connected via the control unit 12 to a respective power supply as indicated above.
When the device is switched on, the method for purification of ambient air is carried out via its elements, all processes taking place automatically when the device is in operation. The accumulated fine particles shall be removed, where necessary, by any of the common approaches such as among other, vacuuming and washing.
In the experiments explained above, the following characteristics were achieved: length of the two electrodes - 650 mm, distance between the electrodes up to 800 mm. For safe operation, the high- voltage pulse electrode 1 and the trapping electrode 2 are preferably arranged in shielding channels, for example with a cross-section of 100x100 mm (not shown). Practically, the device set up for the implementation of the method operates as an ionization channel in a space of a gas medium, i.e., atmosphere. Suitably, depending on the volume in which the purification method and the device are used, a volume-appropriate number of devices arranged in a plane of the required calculable length are arranged. The distance between them shall be determined experimentally so as to ensure the purification of the specified volume.
The electrical consumption of one channel is about 220 W.

Claims

1. A method for the purification of a gas medium under atmospheric pressure comprising creating an electromagnetic field between two electrodes, one of them being a generating electrode and the other one being a trapping electrode characterized in that, a high-voltage pulsed tension with a field intensity of at least 250 V/cm is applied between the electrodes and an ultrasonic field is simultaneously applied creating a non-self-contained pulsed gas discharge, wherein water is injected into the gas discharge medium by sputtering, the electromagnetic field intensity being maintained until the desired purification is achieved.
2. Method according to claim 1, characterized in that the high-voltage pulse tension has values from 10 to 30 kV.
3. A method according to claim 1 or 2, characterized in that the ultrasonic field has frequency of about 1 MHz and power of 5 to 10 W.
4. A device for implementing the method for purification of a gas medium under atmospheric pressure, comprising a generating electrode and a trapping electrode arranged opposite to each other, characterized in that the generating electrode is a high-voltage pulse electrode (1) connected to a high-voltage pulse generator (4) and the trapping electrode (2) is grounded and implemented by at least one ultrasonic emitter (5), connected via a matching unit (6) to an adjustable direct current source (7) having an output stage (8) to the matching unit (6), which output stage (8) is also connected to a setting generator (9), wherein the high- voltage pulse generator (4) is also connected via the matching unit (6) to the setting generator (9), and a differential amplifier (10) and a normalizing amplifier (11) are also provided in parallel to the matching unit (6), all of them being connected to a control unit (12).
5. Device according to claim 4, characterized in that the ultrasonic emitters (5) of the trapping electrode (2) are spaced apart at a distance of min 50 mm.
6. Device according to claim 4 or 5, characterized in that in the control unit (12) a gas contamination measuring device is provided.
7. Device according to any of claims 4 to 6, characterized in that the control unit (12) has a display.
8. An ultrasonic emitter, characterized in that it comprises a housing (13) having an opening (14) with a support (15), wherein the housing (13) connected to the support (15) comprises a metal sound reflector package (16) with two cylindrical piezoceramic elements (17) fixed thereto and extending outside the housing (13) and centrally through the opening (14) a halfwave emitting concentrator (18) being a tubular element with walls along a hyperbolic curve, the front end (19) of which forms part of a spherical concave surface at the most concave point of which a nozzle opening (20) is arranged connected to a water supply pipe (21) centrically and longitudinally arranged throughout the package and through the housing Ultrasonic emitter according to claim 8, characterized in that the spherical concave surface of the front end (19) of the half-wave emitting concentrator (18) has a radius (R) of 500 mm up to 1000 mm Ultrasonic emitter according to any of claims 8 or 9, characterized in that the metal sound reflector (16) and the half- wave emitting concentrator (18) are made from a material with low coefficient of linear thermal expansion at 20 °C, e.g., a = (9-10).10'6/K. Ultrasonic emitter according to claim 10, characterized in that the material from which the metallic sound reflector (16) and the half- wave emitting concentrator (18) are made is kovar. Ultrasonic emitter according to claim 10, characterized in that the material from which the metallic sound reflector (16) and the half-wave emitting concentrator (18) are made is titanium alloy.
PCT/BG2023/000003 2022-03-21 2023-02-20 Method for purification of gas medium under atmospheric pressure, device for implementation of the method and ultrasonic emitter WO2023178392A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BG113506A BG113506A (en) 2022-03-21 2022-03-21 Method for purification of gasesous environments at atmospheric pressure, device for implementation of the method and ultrasonic emitter
BG113506 2022-03-21

Publications (1)

Publication Number Publication Date
WO2023178392A1 true WO2023178392A1 (en) 2023-09-28

Family

ID=88099414

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/BG2023/000003 WO2023178392A1 (en) 2022-03-21 2023-02-20 Method for purification of gas medium under atmospheric pressure, device for implementation of the method and ultrasonic emitter

Country Status (2)

Country Link
BG (1) BG113506A (en)
WO (1) WO2023178392A1 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3976448A (en) * 1972-04-20 1976-08-24 Lin Eng Corporation Electrostatic and sonic gas processing apparatus
RU2083293C1 (en) * 1994-11-01 1997-07-10 Дмитрий Дмитриевич Медведев Method of cleaning of waste, flue and fuel gases from gaseous impurities by means of impulsing corona discharge
RU64274U1 (en) * 2007-02-02 2007-06-27 Дмитрий Павлович Фролов DEVICE FOR LOW-FREQUENCY ACOUSTIC INFLUENCE ON THE PERFORATION ZONE AND OIL LAYER IN THE BOTTOM-HOLE ZONE
RU175916U1 (en) * 2017-02-27 2017-12-22 Артем Анатольевич Миронов DEVICE FOR CLEANING AND PREVENTION OF SEDIMENTS
RU2733395C1 (en) * 2020-06-19 2020-10-01 Александр Залманович Понизовский Electrophysical device for cleaning gases from environmentally harmful impurities, air disinfection and sterilization

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3976448A (en) * 1972-04-20 1976-08-24 Lin Eng Corporation Electrostatic and sonic gas processing apparatus
RU2083293C1 (en) * 1994-11-01 1997-07-10 Дмитрий Дмитриевич Медведев Method of cleaning of waste, flue and fuel gases from gaseous impurities by means of impulsing corona discharge
RU64274U1 (en) * 2007-02-02 2007-06-27 Дмитрий Павлович Фролов DEVICE FOR LOW-FREQUENCY ACOUSTIC INFLUENCE ON THE PERFORATION ZONE AND OIL LAYER IN THE BOTTOM-HOLE ZONE
RU175916U1 (en) * 2017-02-27 2017-12-22 Артем Анатольевич Миронов DEVICE FOR CLEANING AND PREVENTION OF SEDIMENTS
RU2733395C1 (en) * 2020-06-19 2020-10-01 Александр Залманович Понизовский Electrophysical device for cleaning gases from environmentally harmful impurities, air disinfection and sterilization

Also Published As

Publication number Publication date
BG113506A (en) 2023-09-29

Similar Documents

Publication Publication Date Title
Mangolini et al. Radial structure of a low-frequency atmospheric-pressure glow discharge in helium
US6204605B1 (en) Electrodeless discharge at atmospheric pressure
US8038775B2 (en) Separating contaminants from gas ions in corona discharge ionizing bars
EP3219176B1 (en) Balanced barrier discharge neutralization in variable pressure environments
US6262523B1 (en) Large area atmospheric-pressure plasma jet
US20030070913A1 (en) Capacitive discharge plasma ion source
US7214949B2 (en) Ion generation by the temporal control of gaseous dielectric breakdown
WO2011089912A1 (en) Mass spectrometry device
KR20070119072A (en) Apparatus and process for generating, accelerating and propagating beams of electrons and plasma
JP4185163B2 (en) RF ion source
US20140167612A1 (en) Vacuum Ultraviolet Photon Source, Ionization Apparatus, and Related Methods
JP2018040719A5 (en)
US4748635A (en) Apparatus and method for uniform ionization of high pressure gaseous media
US7157721B1 (en) Coupled ionization apparatus and methods
US7910896B2 (en) Micro discharge device ionizer and method of fabricating the same
WO2023178392A1 (en) Method for purification of gas medium under atmospheric pressure, device for implementation of the method and ultrasonic emitter
RU2113538C1 (en) Method of pulse-periodic ion and plasma treatment of product and device for its realization
KR100420129B1 (en) Plasma surface treatment apparatus using multiple electrodes array
Benocci et al. I–V characteristics and photocurrents of a He corona discharge under flow conditions
CN106972239B (en) A kind of novel plasma body antenna and application method
CN219019097U (en) Small-sized dual-purpose planar atmospheric pressure plasma discharge device
Hasaani Magnetic Field Effect on the Characteristics of Large-Volume Glow Discharge in Argon at Low Pressure
WO2020124264A1 (en) Electrode assemblies for plasma discharge devices
Huamao et al. Effect of preionization on forming atmosphere glow discharges in air
AU2002323078A1 (en) Capacitive discharge plasma ion source

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 23773373

Country of ref document: EP

Kind code of ref document: A1