CN114688539A - Experimental device for detecting effect of plasma discharge on flame in pipeline - Google Patents

Experimental device for detecting effect of plasma discharge on flame in pipeline Download PDF

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Publication number
CN114688539A
CN114688539A CN202011600751.9A CN202011600751A CN114688539A CN 114688539 A CN114688539 A CN 114688539A CN 202011600751 A CN202011600751 A CN 202011600751A CN 114688539 A CN114688539 A CN 114688539A
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China
Prior art keywords
burner
outer tube
electrodes
electrically connected
pair
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Pending
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CN202011600751.9A
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Chinese (zh)
Inventor
刘冬
齐丹丹
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Nanjing University of Science and Technology
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Nanjing University of Science and Technology
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Priority to CN202011600751.9A priority Critical patent/CN114688539A/en
Publication of CN114688539A publication Critical patent/CN114688539A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/38—Torches, e.g. for brazing or heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
    • F23M11/00—Safety arrangements
    • F23M11/04—Means for supervising combustion, e.g. windows
    • F23M11/045—Means for supervising combustion, e.g. windows by observing the flame
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N31/00—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods
    • G01N31/12—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods using combustion
    • 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
    • H05H1/0006—Investigating plasma, e.g. measuring the degree of ionisation or the electron temperature

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Health & Medical Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Molecular Biology (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Plasma & Fusion (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)

Abstract

The invention relates to an experimental device for detecting the effect of plasma discharge on flame in a pipeline, which comprises: the high-voltage electric torch comprises a burner, a burner outer tube, a pair of electrodes, a high-voltage power supply, a grounding device and a digital oscilloscope, wherein the burner is vertically arranged upwards and extends into the burner outer tube, an outlet of the burner is communicated with the burner outer tube, and the upper end of the burner outer tube is communicated with the atmosphere; the lower part of the outer pipe of the burner is provided with an air inlet which is connected with a discharge working gas source and is positioned below the outlet of the burner; the pair of electrodes are horizontally arranged above the outlet of the burner, and one part of the electrodes is arranged in the outer tube of the burner; one of the pair of electrodes is electrically connected with a high-voltage power supply, and the other electrode is electrically connected with a grounding device; the digital oscilloscope is used for measuring the parameters of the voltage and the current applied by the high-voltage power supply. The device is simple and convenient to design and easy to disassemble and install, the observability of flame change under the action of plasmas under different flame working conditions is realized, and the safety of an experiment is ensured.

Description

Experimental device for be used for detecting in-pipeline plasma discharge to flame effect
Technical Field
The invention belongs to the field of experimental devices, and particularly relates to an experimental device for detecting the effect of plasma discharge on flame in a pipeline.
Background
The non-equilibrium plasma combustion strengthening technology utilizes the collision of generated high-energy electrons and neutral molecules to cause molecular dissociation and excitation and generate a large amount of active particles so as to accelerate combustion, thereby achieving the purposes of reducing ignition time, accelerating combustion speed, reducing combustion limit and improving combustion efficiency. In the research on the formation and control of inhalable particles of a combustion source in the combustion process, the control of particles in the flame has attracted more extensive attention along with the development of scientific research and diagnostic technology. The device provided by the invention can be used for researching the influence of the non-equilibrium plasma directly acting on different flame working conditions on the flame generation characteristics.
Disclosure of Invention
In order to solve the problems, the invention provides an experimental device for detecting the effect of plasma discharge in a pipeline on flame, which is simple and convenient in design and easy to disassemble and install, realizes the observability of flame change under the action of plasmas under different flame working conditions, and ensures the safety of experiments.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the invention provides an experimental device for detecting the effect of plasma discharge in a pipeline on flame, which comprises: the high-voltage power supply comprises a burner, a burner outer pipe, a pair of electrodes, a high-voltage power supply, a grounding device and a digital oscilloscope, wherein the burner is vertically arranged upwards and extends into the burner outer pipe, an outlet of the burner is communicated with the burner outer pipe, the upper end of the burner outer pipe is communicated with the atmosphere, the lower part of the burner outer pipe is provided with a gas inlet, the gas inlet is connected with a discharge working gas source, and the gas inlet is positioned below the outlet of the burner; the pair of electrodes is horizontally arranged above the outlet of the combustor, and one part of the electrodes is arranged in the outer pipe of the combustor; sealing treatment is adopted between the pair of electrodes and the outer pipe of the burner and between the burner and the lower end of the outer pipe of the burner so as to provide a stable discharge environment in the pipeline; one of the pair of electrodes is electrically connected with the high-voltage power supply, and the other electrode is electrically connected with the grounding device; the digital oscilloscope is used for measuring the parameters of the voltage and the current applied by the high-voltage power supply.
Preferably, the number of the air inlets is 4, and the air inlets are uniformly distributed on the same cross section of the outer pipe of the burner.
Preferably, the pair of electrodes are oppositely spaced apart.
Preferably, the device further comprises a joint and an elbow air inlet connected with a combustible gas source, and the air inlet end of the burner is communicated with the elbow air inlet through the joint.
Preferably, the electrode is composed of a quartz tube and a metal rod, one end of the metal rod is sleeved in the quartz tube, the other end of the metal rod is exposed outside for electrical connection, one of the two metal rods is electrically connected with the high-voltage power supply, and the other metal rod is electrically connected with the grounding device.
Preferably, the device further comprises a high-voltage probe and a current coil, one of the two metal rods is electrically connected with the high-voltage probe, the other metal rod is electrically connected with the current coil, and the high-voltage probe and the current coil are both electrically connected with the digital oscilloscope.
Preferably, the quartz tube is fused or integrally formed with the burner outer tube.
Preferably, the burner is a slit burner.
Preferably, the burner is welded or integrally formed with the lower end of the outer pipe of the burner.
Preferably, the position of a part of the pair of electrodes placed in the outer tube of the burner can be adjusted up and down according to experimental requirements.
Compared with the prior art, the invention has the following remarkable advantages:
1. the burner provided by the invention can continuously and stably provide discharge working gas (such as argon) in the outer tube, the pulse high-voltage power supply connecting electrode can provide kilovolt high voltage in a very short time, the gas in a small area between two symmetrical quartz tubes and metal rod electrodes is broken down, the discharge area reaches 0.07mm2, the accurate discharge realizes the generation of active particles in a concentrated area, the discharge utilization rate is improved, the electrode discharge structures at different positions in the flame spraying direction can be realized in a mode of being integrally manufactured with the burner, the replacement is simple, and the purpose of controlling the generation of flame under the action of plasma in different flame areas is achieved.
2. The burner is simple and convenient in design, easy to disassemble and assemble, changeable in shape selection, and capable of meeting plasma effects under different conditions; the electrode placement mode and the discharge range are small, the discharge utilization rate is improved to a certain extent, and the improvement of the flame size range can be researched under the action of plasma; the burner and the electrode are integrally designed, so that the relative positions of discharge under different working conditions are fixed, the experimental consistency is improved, and the operation error is reduced; the design of the outer tube of the burner can provide specific discharge atmosphere and gas required by flame combustion, and can isolate the interference of external environment.
Drawings
FIG. 1 is a schematic front view of an experimental apparatus for detecting the effect of plasma discharge on flame in a pipe according to the present invention.
FIG. 2 is a schematic top view of an experimental apparatus for detecting the effect of plasma discharge on flame in a pipe according to 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 further described in detail with reference to the following 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.
The following describes the implementation of the present invention in detail with reference to specific embodiments.
With reference to fig. 1-2, the experimental apparatus for detecting the effect of plasma discharge on flame in a pipe provided by the present invention comprises: the device comprises a burner 6, a burner outer tube 1, a pair of electrodes 13, a high-voltage power supply 11, a grounding device 5 and a digital oscilloscope 10, wherein the burner 6 sprays flame vertically upwards, the burner 6 extends into the burner outer tube 1, an outlet 14 of the burner 6 is communicated with the burner outer tube 1, the upper end of the burner outer tube 1 is communicated with the atmosphere, the lower part of the burner outer tube 1 is provided with an air inlet 9, the air inlet 9 is connected with a discharge working gas (such as argon) source, and the air inlet 9 is positioned below the outlet 14 of the burner 6; the pair of electrodes 13 is horizontally arranged above the outlet 14 of the burner 6, and a part of the electrodes is arranged in the outer tube 1 of the burner; one of the pair of electrodes 13 is electrically connected to the high voltage power supply 11, and the other is electrically connected to the grounding device 5; the digital oscilloscope 10 is used for measuring the parameters of the voltage and the current applied by the high-voltage power supply 11. The electrode discharge device is characterized in that sealing treatment is adopted between the pair of electrodes 13 and the outer pipe 1 of the combustor and between the combustor 6 and the lower end of the outer pipe 1 of the combustor, 4 air inlets 9 are uniformly distributed on the same cross section of the outer pipe 1 of the combustor, and discharge working gas is uniformly and continuously introduced through the air inlets 9 to provide a specific atmosphere environment for electrode discharge in a pipeline. The burner 6 is a slit burner, the cross-sectional dimension of the outlet of the burner is 4 x 0.4mm, and the outlet position of the slit burner is 100mm lower than the outlet position of the upper end of the outer pipe 1 of the burner. The pair of electrodes 13 are oppositely arranged at intervals and keep the relative position unchanged, and are parallel to the long sides of the slit outlets of the slit combustor. The device also comprises a joint 8 and an elbow air inlet 7 connected with a combustible gas source, wherein the air inlet end of the combustor 6 is communicated with the elbow air inlet 7 through the joint 8. The electrode 13 is composed of a quartz tube 2 and a metal rod 3, one end of the metal rod 3 is sleeved in the quartz tube 2, the other end of the metal rod is exposed outside for electric connection, one of the two metal rods 3 is electrically connected with the high-voltage power supply 11, and the other is electrically connected with the grounding device 5. The device also comprises a high-voltage probe 12 and a current coil 4, wherein one of the two metal rods 3 is electrically connected with the high-voltage probe 12, the other metal rod is electrically connected with the current coil 4, the high-voltage probe 12 and the current coil 4 are both electrically connected with the digital oscilloscope 10, the voltage of the high-voltage end is measured by the high-voltage probe 12, and the total discharge current is measured by the current coil 4. The quartz tube 2 of the electrode 13 is inserted into the burner outer tube 1 and is inserted into one end of the burner outer tube 1 to be bottomed, the quartz tube 2 is welded with the burner outer tube 1, the metal rod 3 is inserted into the quartz tube 2, and the joint between the part of the metal rod 3 exposed outside and the quartz tube 2 is sealed. The burner 6 is welded with the lower end of the burner outer tube 1. The outer tube 1 of the burner is made of quartz. The position of a part of the pair of electrodes 13 in the outer tube 1 of the burner can be adjusted up and down according to experimental requirements. During the experiment, flame is ignited at the outlet of the combustor 6 and adjusted to a proper working condition to be stable, discharge gas is introduced from the gas inlet 9 on the outer tube 1 of the combustor, after the safe connection detection of an electric device such as a digital oscilloscope 10 is ensured, a high-voltage power supply 11 is turned on, the digital oscilloscope 10 is observed and proper discharge parameters are adjusted, the electrode 13 can be adjusted at different positions in the injection direction of the combustor and is integrally manufactured with the combustor to discharge, and the influence of plasma on the flame and products thereof is observed.
The foregoing shows and describes the general principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (10)

1. An experimental apparatus for detecting the effect of plasma discharge on flame in a pipe, the apparatus comprising: the device comprises a burner (6), a burner outer tube (1), a pair of electrodes (13), a high-voltage power supply (11), a grounding device (5) and a digital oscilloscope (10), wherein the burner (6) is vertically and upwards arranged and extends into the burner outer tube (1), an outlet (14) of the burner (6) is communicated with the burner outer tube (1), the upper end of the burner outer tube (1) is communicated with the atmosphere, an air inlet (9) is arranged at the lower part of the burner outer tube (1), the air inlet (9) is connected with a discharge working gas source, and the air inlet (9) is positioned below the outlet (14) of the burner (6); the pair of electrodes (13) is horizontally arranged above the outlet (14) of the burner (6), and one part of the electrodes is arranged in the outer tube (1) of the burner; sealing treatment is adopted between the pair of electrodes (13) and the outer pipe (1) of the combustor and between the combustor (6) and the lower end of the outer pipe (1) of the combustor so as to provide a stable discharging environment in the pipeline; one of the pair of electrodes (13) is electrically connected with the high-voltage power supply (11), and the other is electrically connected with the grounding device (5); the digital oscilloscope (10) is used for measuring the parameters of the voltage and the current applied by the high-voltage power supply (11).
2. The apparatus of claim 1, wherein: the number of the air inlets (9) is 4, and the air inlets are uniformly distributed on the same cross section of the combustor outer tube (1).
3. The apparatus of claim 1, wherein: the pair of electrodes (13) are oppositely spaced apart.
4. The apparatus of claim 1, wherein: the device also comprises a joint (8) and an elbow air inlet (7) connected with a combustible gas source, wherein the air inlet end of the combustor (6) is communicated with the elbow air inlet (7) through the joint (8).
5. The apparatus of claim 1, wherein: the electrode (13) is composed of a quartz tube (2) and a metal rod (3), one end of the metal rod (3) is sleeved in the quartz tube (2), the other end of the metal rod is exposed outside for electric connection, one of the two metal rods (3) is electrically connected with the high-voltage power supply (11), and the other metal rod is electrically connected with the grounding device (5).
6. The apparatus of claim 5, wherein: the device also comprises a high-voltage probe (12) and a current coil (4), one of the two metal rods (3) is electrically connected with the high-voltage probe (12), the other metal rod is electrically connected with the current coil (4), and the high-voltage probe (12) and the current coil (4) are both electrically connected with the digital oscilloscope (10).
7. The apparatus of claim 5, wherein: the quartz tube (2) and the burner outer tube (1) are welded or integrally formed.
8. The apparatus of claim 1, wherein: the burner (6) is a slit burner.
9. The apparatus of claim 1, wherein: the burner (6) is welded or integrally formed with the lower end of the burner outer tube (1).
10. The apparatus of claim 1, wherein: the position of a part of the pair of electrodes (13) in the outer pipe (1) of the burner can be adjusted up and down according to the experimental requirements.
CN202011600751.9A 2020-12-29 2020-12-29 Experimental device for detecting effect of plasma discharge on flame in pipeline Pending CN114688539A (en)

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Application Number Priority Date Filing Date Title
CN202011600751.9A CN114688539A (en) 2020-12-29 2020-12-29 Experimental device for detecting effect of plasma discharge on flame in pipeline

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Application Number Priority Date Filing Date Title
CN202011600751.9A CN114688539A (en) 2020-12-29 2020-12-29 Experimental device for detecting effect of plasma discharge on flame in pipeline

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CN114688539A true CN114688539A (en) 2022-07-01

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115728438A (en) * 2022-11-18 2023-03-03 天津大学 Device and method for testing combustion characteristics of variable ignition energy working medium

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115728438A (en) * 2022-11-18 2023-03-03 天津大学 Device and method for testing combustion characteristics of variable ignition energy working medium
CN115728438B (en) * 2022-11-18 2024-05-28 天津大学 Device and method for testing combustion characteristics of variable ignition energy working medium

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