CN106989390A - A kind of Bunsen burner formula low temperature plasma assisted combustion device - Google Patents

A kind of Bunsen burner formula low temperature plasma assisted combustion device Download PDF

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Publication number
CN106989390A
CN106989390A CN201710225278.2A CN201710225278A CN106989390A CN 106989390 A CN106989390 A CN 106989390A CN 201710225278 A CN201710225278 A CN 201710225278A CN 106989390 A CN106989390 A CN 106989390A
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quartz glass
temperature plasma
gas
fixed
combustion device
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CN201710225278.2A
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CN106989390B (en
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穆海宝
虞春艳
李平
张冠军
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Xian Jiaotong University
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Xian Jiaotong University
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23DBURNERS
    • F23D14/00Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/02Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
    • F23D14/04Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner
    • F23D14/08Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner with axial outlets at the burner head
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23DBURNERS
    • F23D14/00Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46Details, e.g. noise reduction means
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J27/00Ion beam tubes
    • H01J27/02Ion sources; Ion guns
    • H01J27/16Ion sources; Ion guns using high-frequency excitation, e.g. microwave excitation

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Plasma Technology (AREA)

Abstract

A kind of Bunsen burner formula low temperature plasma assisted combustion device, including base, gas buffer unit and plasma reaction unit;Gas buffer unit includes mounting flange, hold-down bars etc.;Plasma reaction unit includes external electrode, interior electrode and quartz glass tube;The bottom of mounting flange is fixed on bottom plate center, the center offers the gas collection chamber and shoulder hole being connected from bottom to top, the air inlet being connected with gas collection chamber is offered on the side wall of mounting flange, the bottom of quartz glass tube is fixed at shoulder hole, top is extend out to outside mounting flange, the bottom of hold-down bars is fixed on bottom plate center, flanged cap is sleeved on quartz glass tube, and be connected at the top of mounting flange, the bottom of interior electrode is fixed on the top of hold-down bars, and external electrode is sleeved on the quartz glass tube relative with interior electrode.The present invention is dismantled and assembled to be changed, and is easy to use and later maintenance.The low temperature plasma that electric discharge is produced is rich in various active particles, has obvious enhancing effect to burning.

Description

Bunsen burner type low-temperature plasma auxiliary combustion device
The technical field is as follows:
the invention belongs to the technical field of low-temperature plasma application, and particularly relates to a Bunsen burner type low-temperature plasma auxiliary combustion device.
Background art:
in recent years, with the development of low-temperature plasma technology, the combustion-supporting technology based on low-temperature plasma draws attention of scholars at home and abroad. The low-temperature plasma has a large amount of active particles, has important functions on reducing ignition delay and improving combustion efficiency, and the low-temperature plasma combustion-supporting technology has become one of the hot problems studied by various researchers.
However, at present, people's understanding of a combustion-supporting mechanism of low-temperature plasma is still unclear, and the influence of non-thermal equilibrium plasma on combustion characteristics is an extremely complex physicochemical process, and relates to multiple subject fields of electricity, chemical kinetics, thermodynamics, hydrodynamics and the like, so that a technology for effectively utilizing plasma to accurately regulate and control combustion is not available at present. The international research on non-thermal equilibrium plasma-assisted combustion mainly comprises the aspects of design of a plasma combustion-supporting device, combustion-supporting efficiency, mechanism research and the like.
According to different applications and research requirements, researchers design different low-temperature plasma auxiliary combustion devices, for example, Chintala et al in India adopt a flat dielectric barrier discharge electrode structure to generate radio-frequency plasma. The Russian scholars A.Yu.Starikovski et al designed a dielectric barrier discharge generating device at the nozzle, and the propagation speed of the flame was improved by using nanosecond pulsed discharge plasma. The key points of the current plasma combustion-supporting device design are the bottlenecks: (1) matching of the power supply and the electrode structure of the efficient and stable plasma. The plasma generated by the common device has small area, and the plasma with higher energy often faces the problem of overhigh temperature, so that arc discharge is easy to generate in a high-voltage environment, and the microwave source or the nanosecond pulse source required by the forefront device is expensive; (2) matching of plasma reactor and burner configurations. The flat electrode structure convenient for diagnosis is difficult to be used as a burner, and the widely adopted central electrode structure has the defects that the central electrode cannot be well fixed, the manufacturing process is complex and the like.
The invention content is as follows:
the invention aims to provide a Bunsen burner type low-temperature plasma auxiliary combustion device which can generate laminar premixed flame and diffusion flame, and can act high-efficiency low-temperature plasma on combustion to obviously improve the combustion characteristic of fuel.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a Bunsen burner type low-temperature plasma auxiliary combustion device comprises a base, a gas buffer unit and a plasma reaction unit; wherein,
the base comprises a bottom plate and a ground wire binding post arranged on the bottom plate;
the gas buffer unit comprises a fixed flange, a flange cap and a fixed rod;
the plasma reaction unit comprises an outer electrode, an inner electrode and a quartz glass tube;
the bottom of the fixing flange is fixed at the center of the bottom plate, the center of the fixing flange is provided with a gas collecting cavity and a stepped hole which are communicated from bottom to top, the side wall of the fixing flange is provided with an air inlet communicated with the gas collecting cavity, the bottom of the quartz glass tube is fixed at the stepped hole, the top of the quartz glass tube extends out of the fixing flange, the bottom of the fixing rod is fixed at the center of the bottom plate, the top of the fixing rod does not exceed the gas collecting cavity of the fixing flange, a flange cap is sleeved on the quartz glass tube and is connected to the top of the fixing flange, the bottom of the inner electrode is fixed at the top of the fixing rod, the top of the inner electrode does.
The invention has the further improvement that the fixed flange comprises a first fixed flange and a second fixed flange which are connected together by screw threads from bottom to top, and the center of the first fixed flange is provided with an air collecting chamber and a stepped hole which are communicated.
The invention is further improved in that the inner electrode is a columnar electrode made of stainless steel, and the discharge part of the inner electrode is provided with fine threads with the length of 50 mm.
The further improvement of the invention is that a plurality of concentric blocks are sleeved on the inner electrode, and each concentric block is attached to the inner wall of the quartz glass tube.
The invention is further improved in that the concentric block is made of a metal sintered filter element.
The invention is further improved in that the outer electrode is a stainless steel net which is wrapped on the outer wall of the quartz glass tube, and the upper end and the lower end of the quartz glass tube are respectively fixed by fixing aluminum blocks.
The invention is further improved in that the height of the stainless steel net is 50mm, the outer diameter of the quartz glass tube is 12mm, the inner diameter is 8mm, the diameter of the inner electrode is 2mm, 50mm fine threads are tapped on the surface of the discharge part, the reaction length of plasma in the quartz glass tube is 50mm, and the unilateral discharge gap is 3 mm.
The invention has the further improvement that the outer end of the air inlet is connected with a phi 8 air hose, fuel gas or premixed gas is introduced into the air collection chamber in the fixed flange from the air hose, and the fuel gas or the premixed gas is fully mixed to ensure that the pipe orifice is finally laminar gas.
The invention is further improved in that one end of the high-voltage power supply is connected with the power supply when in operationConnected to the external electrode, grounded at the other end, and connected to the ground wire terminal via a resistor RmAnd (4) grounding.
The invention is further improved in that the invention also comprises an oscilloscope, a high-voltage probe, a high-voltage power supply and a resistor RmWherein the high-voltage probe is connected with the oscilloscope, and the high-voltage probe and the ground wire binding post pass through the resistor RmOne end of the high-voltage probe and one end of the high-voltage power supply are connected to the external electrode, the other end of the high-voltage probe and the other end of the high-voltage power supply are grounded, and the high-voltage probe comprises a resistor R connected in series1And a resistance R2And a capacitor C connected in series1And a capacitor C2Resistance R in series1And a resistance R2With a capacitor C in series1And a capacitor C2Are arranged in parallel.
Compared with the prior art, the invention has the following technical effects:
the bunsen burner type low-temperature plasma auxiliary combustion device provided by the invention has the core of a discharge unit consisting of a stainless steel inner electrode, a stainless steel mesh outer electrode and a quartz glass tube blocking medium. Based on the structure of the central electrode, aluminum blocks for fixing and uniformly using are additionally arranged on the stainless steel mesh, and sintered metal is configured in the quartz tube, so that the inner electrode is ensured to be positioned at the central position; the sufficient buffer distance of the gas inside the flange and the laminar flow of the gas collection cavity ensure that the laminar gas which is uniformly mixed reaches the pipe orifice, thereby improving the combustion stability; the device material is mainly stainless steel, and is reliable durable, portable, and the quartz capsule and stainless steel electrode all removable in consideration of the condition that broken, filth probably appear in the quartz capsule during experimental operation.
The Bunsen burner type low-temperature plasma auxiliary combustion device provided by the invention works at normal temperature and normal pressure, expensive vacuum equipment is not needed, and a high-frequency alternating current source is selected as a plasma source; the discharge unit can generate high-efficiency, uniform and low-temperature plasma rich in active ingredients, and the generated active particles can participate in the chain reaction process in combustion, so that the combustion is promoted.
Furthermore, the invention is suitable for fuel gas such as pure methane or premixed gas, which respectively corresponds to diffusion combustion and premixed combustion, and also can add a proper amount of inert gas such as argon, helium and the like to increase the types of plasma active particles so as to generate a new reaction path.
Furthermore, the low-temperature plasma generated by the discharge of the Bunsen burner type low-temperature plasma auxiliary combustion device provided by the invention has an obvious enhancement effect on flame combustion, and can improve the flame propagation speed and the flame temperature. Particularly, under the condition of lean combustion, more oxygen-containing active particles can be generated under the action of low-temperature plasma to promote combustion, and the combustion-supporting effect is more obvious.
Furthermore, in order to solve the problem that the central electrode cannot be well fixed, two concentric blocks are arranged between the inner electrode and the quartz glass tube, and the concentric blocks are made of metal sintered filter elements and play roles in centering and tempering prevention.
Further, in order to generate dense and uniform wire-like discharge, the discharge portion of the stainless steel inner electrode was provided with a fine thread having a length of 50 mm.
Furthermore, in order to obtain high-efficiency and low-temperature plasma, the height of the stainless steel mesh is 50mm, and two fixing aluminum blocks are arranged on the edge of the stainless steel mesh, so that the stainless steel mesh is fixed, and the effect of uniform electric field is also achieved; the outer diameter of the quartz glass tube is 12mm, the inner diameter is 8mm, the diameter of the stainless steel inner electrode is 2mm, and 50mm fine threads are tapped on the surface of the discharge part to generate dense and uniform filamentous discharge.
Furthermore, the structure of the central electrode is convenient for combustion, and in order to solve the problem that the central electrode cannot be well fixed, two concentric blocks are arranged between the stainless steel inner electrode and the quartz tube. The stainless steel inner electrode can be adjusted downwards by 0-10 mm, the distance between the opening of the quartz glass tube and the inner electrode can be adjusted between 30-40 mm, so that the discharge area and the combustion area are not interfered with each other, and active particles in plasma can promote the chain reaction process in combustion.
Description of the drawings:
FIG. 1a is a schematic structural view of the bunsen burner type low-temperature plasma-assisted combustion apparatus of the present invention; FIG. 1b is a cross-sectional view taken along line A-A of FIG. 1 a; FIG. 1c is a top view of FIG. 1 a; FIG. 1d is a partial view of FIG. 1B at B.
FIG. 2 is a wiring diagram of the bunsen burner type low-temperature plasma auxiliary combustion apparatus of the present invention.
In the figure: 1-bottom plate, 2-ground wire terminal, 3-fixed flange, 301-first fixed flange, 302-second fixed flange, 4-flange cap, 5-fixed rod, 6-quartz glass tube, 7-air inlet, 8-internal electrode, 9-concentric block, 10-fixed aluminum block, 11-oscilloscope, 12-high voltage probe and 13-high voltage power supply.
The specific implementation mode is as follows:
the present invention will be described in further detail with reference to specific examples to better understand the functions and features of the present invention.
Referring to fig. 1a to 1d, the bunsen burner type low-temperature plasma auxiliary combustion apparatus provided by the present invention comprises a base, a gas buffer unit and a plasma reaction unit; the base comprises a bottom plate 1 and a ground wire binding post 2 arranged on the bottom plate; the gas buffer unit comprises a fixed flange 3, a flange cap 4 and a fixed rod 5; the plasma reaction unit comprises an outer electrode, an inner electrode 8 and a quartz glass tube 6; the bottom of mounting flange 3 is fixed in bottom plate 1 center department, its center department has seted up gas collection chamber and the shoulder hole that is linked together from bottom to top, set up the air inlet 7 that is linked together with the gas collection chamber on mounting flange 3's the lateral wall, the bottom of quartz glass pipe 6 is fixed in the shoulder hole department, the top stretches out outside mounting flange 3, the bottom of fixing rod 5 is fixed in bottom plate 1 center department, the top is no longer than the gas collection chamber of mounting flange 3, flange cap 4 suit is on quartz glass pipe 6, and connect at mounting flange 3 top, the top at fixing rod 5 is fixed to the bottom of inner electrode 8, the top is no longer than 6 tops of quartz glass pipe, outer electrode suit is on quartz glass pipe 6 relative with inner electrode 8. The quartz glass tube 6 serves as an insulating barrier medium.
Wherein, mounting flange 3 includes threaded connection together and first mounting flange 301 and second mounting flange 302 from bottom to top, and the central department of first mounting flange 301 offers the air-collecting chamber and the shoulder hole that are linked together. The inner electrode 8 is a columnar electrode made of stainless steel.
In order to ensure the air tightness of the device, sealing rings are arranged at the joint of the first fixing flange 301 and the second fixing flange 302 and the joint of the second fixing flange 302 and the flange cap 4.
In order to solve the problem that the central electrode cannot be well fixed, two concentric blocks 9 are arranged between the inner electrode 8 and the quartz glass tube 6, and the concentric blocks 9 are made of metal sintered filter elements and play roles in centering and tempering prevention so as to ensure that the inner electrode 8 is in the center of the quartz glass tube 6. In order to generate dense and uniform wire-shaped discharge, the discharge part of the stainless steel inner electrode is provided with a fine thread with the length of 50 mm. The internal electrode 8 is in threaded connection with the fixing rod 5 in the gas buffering unit, the internal electrode 8 can be adjusted downwards by 0-10 mm, the quartz glass tube 6 needs to be taken down before adjustment, and the diameter of the fixing rod 5 is 5 mm. The quartz glass tube 6 is 30-40 mm higher than the inner electrode 8.
Preferably, the outer electrode is a stainless steel mesh which is wrapped on the outer wall of the quartz glass tube 6, and the upper and lower ends thereof are fixed by fixing aluminum blocks 10, respectively. Wherein, the height of stainless steel net is 50mm, quartz glass tube 6's external diameter is 12mm, and the internal diameter is 8mm, and the diameter of inner electrode 8 is 2mm, and the partial surface of discharging is attacked 50mm fine thread, and the reaction length of plasma is 50mm in quartz glass tube 6, and unilateral discharge gap is 3 mm.
Preferably, the outer end of the air inlet 7 is connected with a phi 8 air pipe, fuel gas or premixed gas is introduced into the air collection cavity inside the fixed flange 3 from the air pipe, and the fuel gas or the premixed gas is fully mixed to finally reach the condition that the pipe orifice is laminar gas.
In addition, the invention also comprisesWave filter 11, high-voltage probe 12, high-voltage power supply 13 and resistor RmWherein the high voltage probe 12 is connected with an oscilloscope, and the high voltage probe 12 and the ground wire binding post 2 pass through a resistor RmOne end of the high-voltage probe 12 and one end of the high-voltage power supply 13 are connected to the external electrode, the other end of the high-voltage probe 12 and the other end of the high-voltage power supply 13 are grounded, and the high-voltage probe 12 comprises a resistor R connected in series1And a resistance R2And a capacitor C connected in series1And a capacitor C2Resistance R in series1And a resistance R2With a capacitor C in series1And a capacitor C2Are arranged in parallel.
The reactor of the invention is mainly made of stainless steel, and all parts can be disassembled, thus being convenient for maintenance and replacement. During experimental operation, the parts except the base can be detached, the stainless steel inner electrode 8 is firstly adjusted, and the stainless steel inner electrode are connected through threads and can be adjusted downwards by 10 mm. After the height of the inner electrode 8 is determined, a first fixing flange 301 and a second fixing flange 302 are sequentially installed, and then the quartz glass tube 6 is placed and then the flange cap 4 is installed for fixing. At the moment, the distance between the stainless steel inner electrode and the opening of the quartz glass tube 6 is 30-40 mm, so that the discharge stability cannot be damaged by high temperature during combustion, active particles in the plasma cannot be quenched, and the active particles can participate in combustion and promote the chain reaction rate.
The circuit connection diagram of the Bunsen burner type low-temperature plasma auxiliary combustion device provided by the invention is shown in figure 2, a gas inlet is in flexible connection with a phi 8 gas pipe, fuel gas such as pure methane or premixed gas is introduced into a gas collection cavity inside a fixed flange 3 from the gas inlet, and after full mixing, laminar flow gas at a pipe orifice is ensured. The power supply is a high-voltage high-frequency alternating current power supply for generating low-temperature plasma, and the plasma is generated in an annular columnar area with the length of 50mm and the unilateral discharge gap of 3 mm. During discharging, the two fixed aluminum blocks at the edge of the stainless steel mesh are equivalent to two grading rings, and have the function of homogenizing an electric field; the surface of the discharging part of the stainless steel inner electrode is tapped with 50mm fine threads to generate dense and uniform wire-shaped discharge. The invention is connected with a high-voltage probe 12 and a grounding resistor R in seriesmThe lead-out wire of the parallel high-voltage probe 12 is connected with an oscilloscope 11, that isA discharge voltage current waveform can be obtained.
The filamentous channel is gradually generated when the discharge starts, and the plasma is uniformly distributed in the whole annular columnar area along with the rise of the voltage; the gas flow rate is increased, and the stable glow-like discharge is favorably formed. According to actual requirements, active particle components in the plasma can be adjusted by adjusting the air flow speed and adjusting the power supply voltage and frequency, so that the low-temperature plasma with uniform and stable discharge and high efficiency is obtained.
The Bunsen burner type low-temperature plasma auxiliary combustion device provided by the invention mainly adopts stainless steel materials, and is convenient to use and later maintenance by applying a detachable design concept. The working environment is normal temperature and normal pressure, does not need expensive vacuum equipment, and is suitable for fuel gas such as pure methane or premixed gas which respectively corresponds to diffusion combustion and premixed combustion. The low-temperature plasma generated by discharge has obvious enhancement effect on combustion, and can improve the flame propagation speed and the flame temperature. Particularly, under the condition of lean combustion, more oxygen-containing active particles can be generated under the action of low-temperature plasma to promote combustion, and the combustion-supporting effect is more obvious.
The above description is only an embodiment of the present invention, but the protection of the present invention is not limited thereto, and any person skilled in the art can apply the technical scope of the present invention, especially the dielectric barrier discharge structure using the center electrode, and the technical solution and inventive concept of the present invention can be transplanted or changed and are covered by the protection scope of the present invention.

Claims (10)

1. The bunsen burner type low-temperature plasma auxiliary combustion device is characterized by comprising a base, a gas buffer unit and a plasma reaction unit; wherein,
the base comprises a bottom plate (1) and a ground wire binding post (2) arranged on the bottom plate;
the gas buffer unit comprises a fixed flange (3), a flange cap (4) and a fixed rod (5);
the plasma reaction unit comprises an outer electrode, an inner electrode (8) and a quartz glass tube (6);
the bottom of mounting flange (3) is fixed in bottom plate (1) center department, gas collection chamber and the shoulder hole that is linked together are seted up from bottom to top to its center department, set up air inlet (7) that are linked together with the gas collection chamber on the lateral wall of mounting flange (3), the bottom of quartz glass pipe (6) is fixed in shoulder hole department, the top stretches out outside mounting flange (3), the bottom of fixed rod (5) is fixed in bottom plate (1) center department, the top is no longer than the gas collection chamber of mounting flange (3), flange cap (4) suit is on quartz glass pipe (6), and connect at mounting flange (3) top, the bottom of inner electrode (8) is fixed at the top of fixed rod (5), the top is no longer than quartz glass pipe (6) top, the suit is on outer electrode and quartz glass pipe (6) relative of inner electrode (8).
2. The Bunsen burner type low-temperature plasma auxiliary combustion device as claimed in claim 1, wherein the fixing flange (3) comprises a first fixing flange (301) and a second fixing flange (302) which are connected together by screw thread from bottom to top, and the center of the first fixing flange (301) is provided with a gas collecting chamber and a stepped hole which are communicated.
3. The bunsen burner type low-temperature plasma auxiliary combustion device as claimed in claim 1, wherein the inner electrode (8) is a cylindrical electrode made of stainless steel, and the discharge portion of the inner electrode (8) is provided with a fine thread having a length of 50 mm.
4. A bunsen burner type low-temperature plasma auxiliary combustion device according to claim 1 or 3, wherein a plurality of concentric blocks (9) are further sleeved on the inner electrode (8), and each concentric block (9) is attached to the inner wall of the quartz glass tube (6).
5. The bunsen burner low-temperature plasma-assisted combustion device as claimed in claim 4, wherein the concentric block (9) is made of a metal sintered filter element.
6. The bunsen burner type low-temperature plasma auxiliary combustion device as claimed in claim 1, wherein the outer electrode is a stainless steel mesh which is wrapped on the outer wall of the quartz glass tube (6), and the upper and lower ends thereof are respectively fixed by fixing aluminum blocks (10).
7. The bunsen burner type low-temperature plasma auxiliary combustion device according to claim 6, wherein the height of the stainless steel mesh is 50mm, the outer diameter of the quartz glass tube (6) is 12mm, the inner diameter is 8mm, the diameter of the inner electrode (8) is 2mm, the surface of the discharge portion is tapped with 50mm fine threads, the reaction length of the plasma in the quartz glass tube (6) is 50mm, and the single-side discharge gap is 3 mm.
8. The Bunsen burner type low-temperature plasma auxiliary combustion device as claimed in claim 1, wherein the outer end of the gas inlet (7) is connected with a phi 8 gas pipe, fuel gas or premixed gas is introduced into the gas collection chamber inside the fixed flange (3) from the gas pipe, and after full mixing, laminar gas is ensured to finally reach the pipe orifice.
9. A bunsen burner type low-temperature plasma auxiliary combustion device as claimed in claim 1, wherein, in operation, one end of the high-voltage power supply is connected to the external electrode, the other end is grounded, and the ground terminal (2) passes through the resistor RmAnd (4) grounding.
10. The bunsen burner type low-temperature plasma auxiliary combustion device according to claim 9, further comprising an oscilloscope (11), a high-voltage probe (12), a high-voltage power supply (13) and a resistor RmWherein the high-voltage probe (12) is connected with an oscilloscope, and the high-voltage probe (12) and the ground wire binding post (2) are connected through a resistor RmOne end of the high-voltage probe (12) and one end of the high-voltage power supply (13) are connected to the outer electrode, the other end of the high-voltage probe (12) and the other end of the high-voltage power supply (13) are grounded, and the high-voltage probe (12) comprises a resistor R connected in series1And a resistance R2And a capacitor C connected in series1And a capacitor C2Resistance R in series1And a resistance R2With a capacitor C in series1And a capacitor C2Are arranged in parallel.
CN201710225278.2A 2017-04-07 2017-04-07 A kind of Bunsen burner formula low temperature plasma assisted combustion device Active CN106989390B (en)

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