CN114599143A - Sliding arc discharge plasma generating system - Google Patents
Sliding arc discharge plasma generating system Download PDFInfo
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- CN114599143A CN114599143A CN202011415305.0A CN202011415305A CN114599143A CN 114599143 A CN114599143 A CN 114599143A CN 202011415305 A CN202011415305 A CN 202011415305A CN 114599143 A CN114599143 A CN 114599143A
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- 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
- H05H1/48—Generating plasma using an arc
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/133—Renewable energy sources, e.g. sunlight
Abstract
The invention discloses a sliding arc discharge plasma generating system, belongs to the technical field of plasma energy conversion, and can solve the problems of low plasma power supply efficiency and H in the existing system2And poor selectivity of CO. The system comprises: the discharging device comprises an insulating base, a cover body arranged on the insulating base and two blade-shaped electrodes arranged in the cover body; the two blade-shaped electrodes are provided with arc edges, and the arc edges of the two blade-shaped electrodes are arranged oppositely; the gas distribution device is used for conveying mixed gas of air and fuel gas to the area between the two blade-shaped electrodes through the insulating base; the constant-current alternating current power supply is used for supplying power to the two blade-shaped electrodes so as to generate sliding arc plasma in the cover body; the discharge frequency of the constant-current alternating-current power supply is adjustable; and an electrical characteristic detection device for detecting a discharge current and a discharge voltage of the discharge device. The invention is used for plasma hydrogen production.
Description
Technical Field
The invention relates to a sliding arc discharge plasma generating system, and belongs to the technical field of plasma energy conversion.
Background
Compared with the catalytic reforming hydrogen production technology, the plasma hydrogen production technology has the characteristics of simple reaction device structure, quick start and stop, low investment and operation cost, high energy density and the like, and has attracted a lot of attention in recent years. The sliding arc discharge plasma is a non-thermal equilibrium plasma and has the characteristics of both thermal plasma and cold plasma. Compared with corona, glow and dielectric barrier discharge plasmas, the electron temperature and electron density of the sliding arc discharge plasma are higher, and the gas temperature (approximately equal to the rotation temperature) is lower. Therefore, the sliding arc discharge plasma is widely applied to the technical field of hydrogen production by plasma. The fuel such as methane and the like is used as a renewable substance energy source, has high hydrogen-carbon ratio (H: C), does not contain nitrogen and sulfur elements, does not generate nitrogen oxides and sulfur oxides in the reforming process, and is the preferred reforming hydrogen production raw material.
At present, hydrogen production H is prepared by reforming fuel such as methane and the like through partial oxidation of blade type sliding arc plasma2The selectivity and CO selectivity are low, and the commonly adopted method is to optimize the structure of a reactor (such as a rotary sliding arc plasma reactor), optimize experimental parameters (such as adding water vapor, increasing discharge power and the like) or cooperatively reform a sliding arc plasma coupling catalyst to prepare hydrogen; however, the optimization methods still have the defects of low plasma power supply efficiency, H2And poor selectivity of CO.
Disclosure of Invention
The invention provides a sliding arc discharge plasma generating system which can solve the problems of low efficiency and H of a plasma power supply in the existing system2And poor selectivity of CO.
The invention provides a sliding arc discharge plasma generating system, comprising: the discharge device comprises an insulating base, a cover body arranged on the insulating base and two blade-shaped electrodes arranged in the cover body; the two blade-shaped electrodes are provided with arc edges, and the arc edges of the two blade-shaped electrodes are arranged oppositely; the gas distribution device is used for conveying mixed gas of air and fuel gas to the area between the two blade-shaped electrodes through the insulating base; the constant-current alternating current power supply is used for supplying power to the two blade-shaped electrodes so as to generate sliding arc plasma in the cover body; the discharge frequency of the constant-current alternating-current power supply is adjustable; and electrical characteristic detection means for detecting a discharge current and a discharge voltage of the discharge means.
Optionally, the system further includes: and the product analysis device is connected to the air outlet at the top end of the cover body and is used for detecting the gas components discharged by the discharge device.
Optionally, the air distribution device comprises a fuel air source, an air source and a flame arrester; the air source and the flame arrester are connected through a first pipeline, the other end of the flame arrester is connected with a second pipeline, and the second pipeline penetrates through the insulating base and extends to the area between the two blade-shaped electrodes; the fuel gas source is connected to the first conduit.
Optionally, the air distribution device further comprises a one-way valve, and the one-way valve is arranged on a connecting pipeline between the fuel air source and the first pipeline.
Optionally, the two blade-shaped electrodes are a first electrode and a second electrode respectively; the positive electrode of the constant current alternating current power supply is connected with the first electrode, and the negative electrode of the constant current alternating current power supply is connected with the second electrode through a sampling resistor.
Optionally, the electrical characteristic detection device includes a high-voltage probe, a low-voltage probe and a digital oscilloscope; one end of the high-voltage probe is connected to a connecting lead of a positive electrode of the constant-current alternating-current power supply and the first electrode, and the other end of the high-voltage probe is connected to the digital oscilloscope; the high-voltage probe is used for detecting the discharge voltage of the discharge device; one end of the low-voltage probe is connected to the connecting lead of the sampling resistor and the second electrode, and the other end of the low-voltage probe is connected to the digital oscilloscope; the low-voltage probe is used for detecting the voltage at two ends of the sampling resistor.
Optionally, the shortest distance between the arc edges of the two blade-shaped electrodes is 2mm to 8 mm.
Optionally, the volume flow rate of the fuel gas output by the fuel gas source is 2-2.5L/min; the volume flow rate of the air output by the air source is 4.8-5.2L/min; the fuel gas is one or more than two of methane gas, methanol steam, ethanol steam, n-heptane gas, natural gas, gasoline steam and diesel oil steam.
Optionally, the cover body is made of quartz glass.
Optionally, the insulating base is made of polytetrafluoroethylene.
The invention can produce the beneficial effects that:
the sliding arc discharge plasma generating system provided by the invention has the advantages that from the electrical angle, the constant-current alternating current power supply and the blade type sliding arc plasma generator achieve resonance, so that the plasma power supply is ensured to output at the maximum power under the current condition, more energy is used for generating plasma, the conversion of fuel gas and oxygen is promoted, and the H is improved2And selectivity to CO.
Drawings
Fig. 1 is a schematic structural diagram of a sliding arc discharge plasma generation system according to an embodiment of the present invention.
List of parts and reference numerals:
1. a blade-shaped electrode; 2. a constant current AC power supply; 3. an insulating base; 4. a cover body; 5. sampling a resistor; 6. a flame arrestor; 7. a one-way valve; 8. a source of fuel gas; 9. an air source; 10. an air outlet; 11. a gas chromatography analyzer; 12. a digital oscilloscope; 13. a high-voltage probe; 14. a low voltage probe.
Detailed Description
The present invention will be described in detail with reference to examples, but the present invention is not limited to these examples.
An embodiment of the present invention provides a sliding arc discharge plasma generation system, as shown in fig. 1, the system includes: the discharge device comprises an insulating base 3, a cover body 4 arranged on the insulating base 3 and two blade-shaped electrodes 1 arranged in the cover body 4; the two blade-shaped electrodes 1 are provided with arc edges, and the arc edges of the two blade-shaped electrodes 1 are arranged oppositely; the gas distribution device is used for conveying mixed gas of air and fuel gas to the area between the two blade-shaped electrodes 1 through the insulating base 3; the constant current alternating current power supply 2 is used for supplying power to the two blade-shaped electrodes 1 so as to generate sliding arc plasma in the cover body 4; the discharge frequency of the constant-current alternating-current power supply 2 is adjustable; and an electrical characteristic detection device for detecting a discharge current and a discharge voltage of the discharge device.
Wherein the fuel gas can be one or more of methane gas, methanol vapor, ethanol vapor, n-heptane gas, natural gas, gasoline vapor and diesel oil vapor.
In practical applications, the shortest distance between the arc-shaped edges of the two blade-shaped electrodes 1 is set to be generally between 2mm and 8mm, and preferably, may be set to be 3 mm.
The embodiment of the invention does not limit the specific materials of the cover body 4 and the insulating base 3, and for example, the cover body 4 can be made of quartz glass; the insulating base 3 may be made of teflon.
From the electrical point of view, the invention ensures that the impedance matching degree of the blade type sliding arc plasma reactor (namely the discharging device) and the constant current alternating current power supply 2 is good by optimizing the frequency of the constant current alternating current power supply 2, thus improving the efficiency of the plasma power supply, and ensuring that the constant current alternating current power supply 2 and the blade type sliding arc plasma reactor can output with the maximum power during the combined experiment, thereby further improving the H2And selectivity to CO.
Further, the system further comprises: and the product analysis device is connected to the gas outlet 10 at the top end of the cover body 4 and is used for detecting gas components discharged by the discharge device. In practical applications, the product analysis device may include the gas chromatograph 11 and a computer, which is directly connected to the gas chromatograph.
Referring to fig. 1, the air distribution device comprises a fuel air source 8, an air source 9 and a flame arrester 6; the air source 9 and the flame arrester 6 are connected through a first pipeline, the other end of the flame arrester 6 is connected with a second pipeline, and the second pipeline penetrates through the insulating base 3 and extends to the area between the two blade-shaped electrodes 1; a fuel gas source 8 is connected to the first conduit.
Further, the air distribution device also comprises a one-way valve 7, and the one-way valve 7 is arranged on a connecting pipeline between the fuel air source 8 and the first pipeline.
The air distribution device comprises an air source and a fuel gas source 8, and the fuel gas passes through a one-way valve 7 and then is mixed with air to enter a blade type sliding arc plasma reactor (namely a discharge device); in practical application, the volume flow rate of the fuel gas output by the fuel gas source 8 is generally 2-2.5L/min; the volume flow rate of the air output by the air source 9 is generally 4.8-5.2L/min. Preferably, the volume flow rate of the fuel gas is 2.1L/min, and the volume flow rate of the air is 5L/min; the volume fraction of the fuel gas in the mixed gas is about 0.296; the explosion limit of fuel gas in air is 0.044-0.17.
In the embodiment of the present invention, referring to fig. 1, two blade-shaped electrodes 1 are a first electrode and a second electrode, respectively; the positive electrode of the constant current alternating current power supply 2 is connected with the first electrode, and the negative electrode of the constant current alternating current power supply 2 is connected with the second electrode through the sampling resistor 5.
Further, the electrical characteristic detection device comprises a high-voltage probe 13, a low-voltage probe 14 and a digital oscilloscope 12; one end of the high-voltage probe 13 is connected to a connecting lead of the positive electrode and the first electrode of the constant-current alternating-current power supply 2, and the other end of the high-voltage probe is connected to the digital oscilloscope 12; the high-voltage probe 13 is used for detecting the discharge voltage of the discharge device; one end of the low-voltage probe 14 is connected to a connecting lead of the sampling resistor 5 and the second electrode, and the other end is connected to the digital oscilloscope 12; the low-voltage probe 14 is used for detecting the voltage across the sampling resistor 5, and further obtaining the discharge current of the discharge device.
The specific implementation process of the invention is as follows: after the air and the fuel gas form mixed gas, the mixed gas passes through a strong electric field, the narrowest gap distance between the two metal blade-shaped electrodes 1 can be punctured, so that an electric arc is formed, and the electric arc slides downstream (namely towards the direction of the air outlet 10) under the pushing of the air flow, so that a sliding arc plasma is formed. After the sliding arc discharge is formed, the total gas flow rate is kept unchanged, the frequencies of the constant current alternating current power supply 2 are respectively set to 39kHz, 40kHz, 41kHz, 42kHz, 43kHz and 44kHz, voltage and current waveforms under different frequencies are respectively collected, the average discharge power is calculated, reformed gas under different frequencies is respectively collected, and gas components are analyzed. The experimental result shows that when the discharge frequency of the constant-current alternating-current power supply 2 is 40kHz, the output power of the power supply reaches the maximum, and H is simultaneously2And CO, the highest selectivity was achieved, whereby 40kHz was considered to be the resonant frequency of the constant current ac power supply 2 and the blade sliding arc plasma reactor.
The present invention provides a sliding arc discharge plasma generation systemFrom the electrical perspective, the constant current alternating current power supply 2 and the blade type sliding arc plasma generator are in resonance to ensure that the plasma power supply outputs at the maximum power under the current condition, so that more energy is used for generating plasmas, the conversion of fuel gas such as methane and oxygen is promoted, and the H is improved2And selectivity to CO.
Although the present application has been described with reference to a few embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the application as defined by the appended claims.
Claims (10)
1. A sliding arc discharge plasma generating system, comprising:
the discharge device comprises an insulating base, a cover body arranged on the insulating base and two blade-shaped electrodes arranged in the cover body; the two blade-shaped electrodes are provided with arc edges, and the arc edges of the two blade-shaped electrodes are arranged oppositely;
the gas distribution device is used for conveying mixed gas of air and fuel gas to the area between the two blade-shaped electrodes through the insulating base;
the constant-current alternating current power supply is used for supplying power to the two blade-shaped electrodes so as to generate sliding arc plasma in the cover body; the discharge frequency of the constant-current alternating-current power supply is adjustable;
and an electrical characteristic detection device for detecting a discharge current and a discharge voltage of the discharge device.
2. The system of claim 1, further comprising:
and the product analysis device is connected to the air outlet at the top end of the cover body and is used for detecting the gas components discharged by the discharge device.
3. The system of claim 1 or 2, wherein the air distribution device comprises a fuel air source, an air source, and a flame arrestor;
the air source and the flame arrester are connected through a first pipeline, the other end of the flame arrester is connected with a second pipeline, and the second pipeline penetrates through the insulating base and extends to the area between the two blade-shaped electrodes;
the fuel gas source is connected to the first conduit.
4. The system of claim 3, wherein the gas distribution device further comprises a one-way valve disposed on a connecting conduit between the fuel gas source and the first conduit.
5. The system of claim 1 or 2, wherein the two blade-like electrodes are a first electrode and a second electrode, respectively;
the positive electrode of the constant current alternating current power supply is connected with the first electrode, and the negative electrode of the constant current alternating current power supply is connected with the second electrode through a sampling resistor.
6. The system of claim 5, wherein the electrical characteristic detection device comprises a high voltage probe, a low voltage probe, and a digital oscilloscope;
one end of the high-voltage probe is connected to a connecting lead of a positive electrode of the constant-current alternating-current power supply and the first electrode, and the other end of the high-voltage probe is connected to the digital oscilloscope; the high-voltage probe is used for detecting the discharge voltage of the discharge device;
one end of the low-voltage probe is connected to the connecting lead of the sampling resistor and the second electrode, and the other end of the low-voltage probe is connected to the digital oscilloscope; the low-voltage probe is used for detecting the voltage at two ends of the sampling resistor.
7. The system of claim 1, wherein the shortest distance between the arc-shaped edges of two of the blade-shaped electrodes is 2mm to 8 mm.
8. The system of claim 3, wherein the volumetric flow rate of the fuel gas output by the fuel gas source is 2-2.5L/min; the volume flow rate of the air output by the air source is 4.8-5.2L/min; the fuel gas is one or more than two of methane gas, methanol steam, ethanol steam, natural gas, n-heptane gas, gasoline steam and diesel oil steam.
9. The system of claim 1, wherein the cover is made of quartz glass.
10. The system of claim 1, wherein the insulating base is made of teflon.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011415305.0A CN114599143A (en) | 2020-12-04 | 2020-12-04 | Sliding arc discharge plasma generating system |
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| CN202011415305.0A CN114599143A (en) | 2020-12-04 | 2020-12-04 | Sliding arc discharge plasma generating system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115259308A (en) * | 2022-08-09 | 2022-11-01 | 大连理工大学 | Device and method for treating wastewater by using atomized plasma |
| CN115428827A (en) * | 2022-08-31 | 2022-12-06 | 西安交通大学 | Gas-filled packaging device and method based on plasma activated gas |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115428827A (en) * | 2022-08-31 | 2022-12-06 | 西安交通大学 | Gas-filled packaging device and method based on plasma activated gas |
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Application publication date: 20220607 |