CN109600901B - Method for reducing discharge breakdown voltage in liquid medium - Google Patents
Method for reducing discharge breakdown voltage in liquid medium Download PDFInfo
- Publication number
- CN109600901B CN109600901B CN201811348644.4A CN201811348644A CN109600901B CN 109600901 B CN109600901 B CN 109600901B CN 201811348644 A CN201811348644 A CN 201811348644A CN 109600901 B CN109600901 B CN 109600901B
- Authority
- CN
- China
- Prior art keywords
- electrodes
- discharge
- voltage
- liquid
- breakdown voltage
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired - Fee Related
Links
Images
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H1/00—Generating plasma; Handling plasma
- H05H1/24—Generating plasma
- H05H1/46—Generating plasma using applied electromagnetic fields, e.g. high frequency or microwave energy
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Electromagnetism (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
Abstract
The invention belongs to the technical field of plasmas discharged in a liquid medium, and discloses a method for reducing discharge breakdown voltage in the liquid medium. The method comprises the following steps: s1, oppositely placing the two electrodes in the discharge liquid, setting the initial distance between the two electrodes, respectively clamping the two electrodes, and enabling at least one electrode to have the freedom degree of movement around the self clamping point; s2, applying high voltage between the two electrodes, and attracting the two electrodes to enable the bottom ends of the two electrodes to gradually approach each other, so that the distance between the two electrodes is shortened, and the breakdown voltage between the two electrodes is reduced; s3, gradually increasing the applied high voltage until discharge occurs between the two electrodes, the discharge voltage breaking down the discharge liquid between the two electrodes, and after the discharge is ignited, the two electrodes recover to the initial distance, so that the breaking down process is completed. The invention reduces the breakdown voltage in the liquid medium, avoids the ablation of the electrode, improves the utilization rate of energy and reduces the difficulty of discharging in water.
Description
Technical Field
The invention belongs to the technical field of plasmas discharged in a liquid medium, and particularly relates to a method for reducing discharge breakdown voltage in the liquid medium.
Background
In recent years, research and application of discharge plasma in liquid are widely concerned at home and abroad, and discharge in liquid has important significance in hydrogen production by ethanol reforming, sewage treatment and sterilization. In the current research on the application of liquid phase discharge, the electrode spacing of the device is constant whether the electrode is needle-plate, needle-needle or plate-plate. Whereas the in-water discharge is characterized by a very high breakdown voltage and a relatively low voltage to sustain the discharge once ignited. If the discharge gap is loaded with a high enough voltage, although the discharge can be easily generated, the generated negative problems are many, including that the higher voltage level increases the volume and the cost of the power supply, and if the voltage cannot be adjusted back in time after the breakdown, the stabilized discharge current is relatively large, which can cause the ablation of the electrode on one hand, thereby affecting the service life and the safety of the discharge device, on the other hand, the load and the energy consumption of the power supply are also increased, and simultaneously, the working condition of the discharge device is not easy to be regulated, and if the output voltage of the power supply is not high enough, the discharge cannot be generated at all.
At present, in the process of generating discharge in a liquid medium, the electrodes are clamped and fixed without freedom degree, when voltage is applied to the two electrodes, the liquid medium between the electrodes can be punctured only when the applied voltage is high enough (for example, when the breakdown voltage of the two electrodes is over 25KV when the two electrodes are 1mm in deionized water), so that the requirements on experimental equipment are extremely high, and the implementation is difficult.
Disclosure of Invention
Aiming at the defects or the improvement requirements of the prior art, the invention provides a method for reducing discharge breakdown voltage in a liquid medium, under the condition of not changing the size of a discharge gap, the structure of an electrode and the discharge medium, the distance between the electrode and the liquid medium can be adjusted under the action of electrostatic force by enabling the electrode to have certain degree of freedom, the distance between the electrode and the liquid medium is shortened by mutual attraction of the two electrodes after the electrode is electrified, so that the discharge breakdown voltage in the liquid medium is reduced, when the discharge gap is broken down, current conduction exists between the two electrodes, the electrostatic attraction between the two electrodes disappears, the two electrodes return to the initial position to avoid the ablation of the electrode and the out-of-control of discharge caused by over intense discharge, the breakdown voltage of the discharge in water is greatly reduced, the utilization rate of energy is improved, and the difficulty of the discharge in water is reduced.
To achieve the above object, according to the present invention, there is provided a method for reducing a discharge breakdown voltage in a liquid medium, characterized in that the method comprises the steps of:
s1, oppositely placing two electrodes in the discharge liquid, setting the initial distance between the two electrodes, respectively clamping the two electrodes, and enabling at least one electrode to have the freedom degree of moving around the self clamping point;
s2, applying high voltage between the two electrodes, and attracting the two electrodes to enable the bottom ends of the two electrodes to gradually approach each other, so that the distance between the two electrodes is shortened, and the breakdown voltage between the two electrodes is reduced;
s3, the applied high voltage is gradually increased until the discharge occurs between the two electrodes, the discharge voltage breaks down the discharge liquid between the two electrodes, and after the discharge is ignited, the two electrodes recover to the initial distance, so that the breakdown process is completed.
Further preferably, in step S2, the power supply for applying the high voltage is preferably a dc power supply, a pulse power supply, an ac power supply, a radio frequency power supply, or a microwave power supply.
Further preferably, in step S1, the discharge liquid is preferably a non-conductive liquid.
Further preferably, in step S1, the discharging liquid is preferably absolute ethyl alcohol, an organic solvent, distilled water or deionized water.
In general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:
1. the two electrodes are arranged with a certain degree of freedom, so that the electrodes attract each other after high voltage is applied, the distance between the electrodes is shortened, the breakdown voltage is reduced, meanwhile, the electrodes can automatically return to the initial distance after discharge ignition, the discharge runaway and electrode ablation caused by over intense discharge are avoided, the safety is improved, and the service life is prolonged;
2. the invention applies high voltage on the two electrodes to continuously deposit charges at the bottom ends of the electrodes. Because the two electrodes are respectively a cathode and an anode, charges accumulated on the two electrodes are respectively negative charges and positive charges, electrostatic attraction is formed between the charges with different polarities under the action of an electrostatic field, so that the cathode and the anode are close to each other, when the distance between the two electrodes is close enough, a liquid medium is punctured under the action of an external voltage to generate discharge, after the discharge is generated, a conductive plasma channel is formed between the two electrodes, so that a conductive current flows through the electrodes, the charges accumulated on the electrodes disappear, the electrostatic attraction disappears, the two electrodes losing the action of the attraction are separated from each other, the electrode gap is increased, however, after the discharge is ignited, the voltage required for continuously maintaining the discharge is relatively low, and the discharge cannot be extinguished in the process of increasing the electrode gap. If the initial spacing between the electrodes is small, the discharge will continue as the electrodes return to the initial position until the applied voltage is removed. On the other hand, if the initial distance between the electrodes is large, the applied voltage is not sufficient to sustain the discharge when the electrodes return to the initial position, and the discharge is extinguished.
Drawings
Fig. 1 is a schematic diagram of a structure for discharging in a medium liquid constructed in accordance with a preferred embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
According to the preferred embodiment of the present invention, a device for generating an electric discharge in a liquid medium is provided, and fig. 1 is a schematic view of a structure for generating an electric discharge in a liquid medium according to the preferred embodiment of the present invention, the device comprising the following structures: the device comprises a high-voltage power supply, a movable electrode capable of bearing high voltage, an underwater discharge vessel, a movable electrode fixing lantern ring, a ground electrode and an oscilloscope.
The high-voltage power supply can be a direct-current power supply, a pulse power supply, an alternating-current power supply, a radio-frequency power supply and a microwave power supply; the electrode can adopt metal needles with good conductivity, such as stainless steel needles, tungsten needles and the like; the high voltage applied on the electrode is a voltage larger than 220V, and the difference of the discharge voltage is large under different medium conditions, such as the breakdown voltage is higher than 30kV when the liquid is deionized water, and the breakdown voltage can be as low as 15kV when the liquid is absolute ethyl alcohol.
The discharge vessel in water is quartz glass vessel or other vessels which do not react with liquid and have good insulativity, high pressure resistance and high temperature resistance; the discharge liquid can be non-conductive liquid such as absolute ethyl alcohol, organic solvent, distilled water, deionized water and the like; the movable electrode fixing lantern ring is made of sponge rubber, other elastic substances or other fixing modes which can enable the electrodes to move can be adopted, and both the two electrodes can move or only one electrode can move; the method provided by the invention is suitable for needle-needle discharge, needle-plate discharge and discharge between other electrodes.
When the electrode does not pressurize, the two poles of the earth keep certain interval, when the high voltage electrode circular telegram, promote voltage gradually and do not puncture before discharging, accumulate the static charge on two movable electrodes, the electrode attracts each other under the effect of electrostatic force and is close to make the clearance of discharging reduce, reach the effect that reduces the breakdown voltage, and after discharging, the accumulation charge on two electrodes disappears, the effect of electrode lost electrostatic attraction power, can get back to initial interval under the effect of gravity or resilience force, moreover discharge can not be interrupted.
The effects of the present invention will be further described with reference to specific examples.
A40 KHZ high-voltage alternating-current power supply is selected, the discharge mode is liquid phase needle-needle discharge, the high-voltage electrode is a stainless steel needle, the discharge vessel uses a quartz glass container, the stainless steel needle is fixed on the container through an elastic sponge rubber lantern ring, the thickness of the sponge is adjusted to enable the electrode to be movable within a certain range, and the liquid adopts distilled water.
The initial distance between the stainless steel needles, namely the electrodes, is 5mm, after the stainless steel needles are electrified, the two stainless steel needles approach under the attraction of electrostatic force until the distance is about 1mm, discharge is generated when the voltage is 15KV, after the discharge, the two stainless steel needles lose the attraction and recover to the initial distance of 5mm, and the discharge is still carried out.
Comparative experiment: the selected power supply, electrode material, container and discharge mode are not changed, and the fixing mode of the electrodes is changed into an immovable fixing mode, i.e. the distance between the two electrodes is unchangeable. The distance between the first group of electrodes is 5mm, the voltage is added to 30KV, and no discharge is generated; the second set of electrodes was spaced 1mm apart and pressurized to 25KV to produce a discharge.
It can be seen from the comparison experiment that, when two electrodes have a certain degree of freedom, after voltage is applied to the two electrodes, the electrodes attract each other, the distance between the two electrodes is shortened, the breakdown voltage of underwater discharge is greatly reduced, so that the breakdown voltage is reduced to 15KV above 30KV, the discharge mode is not influenced in the process, the discharge is easier, the distance for keeping the discharge is not influenced, and the discharge can still be easily realized under the condition of larger electrode distance.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (4)
1. A method of reducing the breakdown voltage of a discharge in a liquid medium, the method comprising the steps of:
s1, oppositely placing two electrodes in the discharge liquid, setting the initial distance between the two electrodes, respectively clamping the two electrodes, and enabling at least one electrode to have the freedom degree of moving around the self clamping point;
s2, applying high voltage between the two electrodes, and continuously depositing charges at the bottom ends of the electrodes to form electrostatic attraction, so that the bottom ends of the two electrodes are attracted to each other and gradually approach each other, thereby shortening the distance between the two electrodes and reducing the breakdown voltage between the two electrodes;
s3, the applied high voltage is gradually increased until the discharge occurs between the two electrodes, the discharge voltage breaks down the discharge liquid between the two electrodes, and after the discharge is ignited, the two electrodes recover to the initial distance, so that the breakdown process is completed.
2. The method of claim 1, wherein in step S2, the power source for applying high voltage is selected from the group consisting of dc power source, pulse power source, ac power source, rf power source, and microwave power source.
3. The method for reducing discharge breakdown voltage in a liquid medium according to claim 1 or 2, wherein in step S1, the discharge liquid is a non-conductive liquid.
4. The method for reducing discharge breakdown voltage in liquid medium according to claim 1, wherein in step S1, the discharge liquid is absolute ethyl alcohol, organic solvent, distilled water or deionized water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811348644.4A CN109600901B (en) | 2018-11-13 | 2018-11-13 | Method for reducing discharge breakdown voltage in liquid medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811348644.4A CN109600901B (en) | 2018-11-13 | 2018-11-13 | Method for reducing discharge breakdown voltage in liquid medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109600901A CN109600901A (en) | 2019-04-09 |
| CN109600901B true CN109600901B (en) | 2020-06-30 |
Family
ID=65957743
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811348644.4A Expired - Fee Related CN109600901B (en) | 2018-11-13 | 2018-11-13 | Method for reducing discharge breakdown voltage in liquid medium |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109600901B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100927426B1 (en) * | 2009-03-06 | 2009-11-19 | 주식회사 비와이 | Plasma treatment device and method thereof, ballast water treatment device |
| JP4409827B2 (en) * | 2002-12-25 | 2010-02-03 | 亮拿 佐藤 | Arc generator, arc water production apparatus, arc generation method, arc water production method, and arc treatment method |
| CN205263254U (en) * | 2015-12-31 | 2016-05-25 | 武汉大学 | Liquid dielectric breakdown voltage test device |
| CN105869485A (en) * | 2016-05-26 | 2016-08-17 | 山西大学 | Variable-gas-pressure high-pressure discharge system for experiments |
| CN205616578U (en) * | 2016-04-18 | 2016-10-05 | 新特能源股份有限公司 | Discharge electrode |
-
2018
- 2018-11-13 CN CN201811348644.4A patent/CN109600901B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4409827B2 (en) * | 2002-12-25 | 2010-02-03 | 亮拿 佐藤 | Arc generator, arc water production apparatus, arc generation method, arc water production method, and arc treatment method |
| KR100927426B1 (en) * | 2009-03-06 | 2009-11-19 | 주식회사 비와이 | Plasma treatment device and method thereof, ballast water treatment device |
| CN205263254U (en) * | 2015-12-31 | 2016-05-25 | 武汉大学 | Liquid dielectric breakdown voltage test device |
| CN205616578U (en) * | 2016-04-18 | 2016-10-05 | 新特能源股份有限公司 | Discharge electrode |
| CN105869485A (en) * | 2016-05-26 | 2016-08-17 | 山西大学 | Variable-gas-pressure high-pressure discharge system for experiments |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109600901A (en) | 2019-04-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100467662C (en) | High peak power plasma pulsed supply with arc handling capacity | |
| CN102583656B (en) | Dielectric barrier discharge water treatment device | |
| US11014836B2 (en) | Autonomous bubble generating plasma unit for water treatment | |
| CN202524634U (en) | Low-temperature plasma brush generating device with enhanced dielectric barrier discharge | |
| US20100006419A1 (en) | Device for generation of pulsed corona discharge | |
| CN102448239A (en) | Dielectric barrier discharge enhanced-type low-temperature plasma brush generation device | |
| US20230017324A1 (en) | Plasma generator | |
| CN108322983A (en) | Floating electrode amplified medium barrier discharge disperse plasma jet generating means | |
| CN1708204A (en) | Capacity coupling atmosphere glow-discharge plasma generator | |
| US20230257135A1 (en) | Micro-cathode arc propulsion system | |
| CN109600901B (en) | Method for reducing discharge breakdown voltage in liquid medium | |
| Panov et al. | Pulsed electrical breakdown of conductive water with air bubbles | |
| CN105714323B (en) | The method that dc-pulse method quickly prepares fluorescent carbon quantum dot | |
| CN204518205U (en) | Atmospheric pressure hollow substrate electrode plasma jet flow generating apparatus | |
| CN103275342B (en) | Method for pulsed bias-assistant plasma high-speed treatment on organic film | |
| CN103194001B (en) | Plasma treatment device and plasma treatment method for polymer material surface modification | |
| CN208001395U (en) | Floating electrode amplified medium barrier discharge disperse plasma jet generating means | |
| Hanashiro et al. | Investigation on small DC vacuum arc characteristic under transverse magnetic field | |
| CN215268833U (en) | Low-temperature plasma generating equipment | |
| CN109065433A (en) | A kind of apparatus and method of normal pressure pulse assistant flat-plate radio frequency glow discharge | |
| CN104540313A (en) | Atmospheric plasma jet generation device with hollow substrate and electrodes | |
| CN105161979B (en) | A kind of multistage field distortion gas spark switch | |
| CN106851955A (en) | A kind of device and method of generation large volume homogenous atmospheric-pressure discharge | |
| RU2011128767A (en) | METHOD FOR PRODUCING NANOPOWDERS FROM VARIOUS ELECTRIC CONDUCTING MATERIALS | |
| CN207531152U (en) | A kind of double rings electrode coplanar discharge plasma producing apparatus |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200630 Termination date: 20211113 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |