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 PDFInfo
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 48
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 45
- 238000006243 chemical reaction Methods 0.000 claims abstract description 15
- 239000007789 gas Substances 0.000 claims description 42
- 229910001220 stainless steel Inorganic materials 0.000 claims description 29
- 239000010935 stainless steel Substances 0.000 claims description 29
- 239000000523 sample Substances 0.000 claims description 22
- 239000003990 capacitor Substances 0.000 claims description 8
- 229910052782 aluminium Inorganic materials 0.000 claims description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 7
- 239000002737 fuel gas Substances 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 239000002245 particle Substances 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 8
- 238000012423 maintenance Methods 0.000 abstract description 3
- 230000006872 improvement Effects 0.000 description 9
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
- 239000010453 quartz Substances 0.000 description 5
- 230000004888 barrier function Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000005496 tempering Methods 0.000 description 2
- 238000000563 Verneuil process Methods 0.000 description 1
- 239000004480 active ingredient Substances 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000001311 chemical methods and process Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000037361 pathway Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000002054 transplantation Methods 0.000 description 1
Classifications
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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
- F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
- F23D14/04—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner
- F23D14/08—Premix 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
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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
- F23D14/46—Details, e.g. noise reduction means
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J27/00—Ion beam tubes
- H01J27/02—Ion sources; Ion guns
- H01J27/16—Ion sources; Ion guns using high-frequency excitation, e.g. microwave excitation
Landscapes
- 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
一种本生灯式低温等离子体辅助燃烧装置，包括底座、气体缓冲单元和等离子体反应单元；气体缓冲单元包括固定法兰、固定棒等；等离子体反应单元包括外电极、内电极和石英玻璃管；固定法兰的底部固定在底板中心处，其中心处自下而上开设有相连通的集气腔室和阶梯孔，固定法兰的侧壁上开设有与集气腔室相连通的进气口，石英玻璃管的底部固定在阶梯孔处，顶部伸出至固定法兰外，固定棒的底部固定在底板中心处，法兰帽套装在石英玻璃管上，且连接在固定法兰顶部，内电极的底部固定在固定棒的顶部，外电极套装在与内电极相对的石英玻璃管上。本发明可拆装更换，便于使用与后期维护。放电产生的低温等离子体富含各种活性粒子，对燃烧有明显的增强效果。
A Bunsen burner type low-temperature plasma assisted combustion device, including a base, a gas buffer unit and a plasma reaction unit; the gas buffer unit includes a fixing flange, a fixing rod, etc.; the plasma reaction unit includes an outer electrode, an inner electrode and quartz glass tube; the bottom of the fixed flange is fixed at the center of the bottom plate, and the center is provided with a connected gas-collecting chamber and a stepped hole from bottom to top, and the side wall of the fixed flange is provided with a gas-collecting chamber. Air inlet, the bottom of the quartz glass tube is fixed at the stepped hole, the top protrudes out of the fixing flange, the bottom of the fixing rod is fixed at the center of the bottom plate, the flange cap is set on the quartz glass tube and connected to the fixing flange The top and the bottom of the inner electrode are fixed on the top of the fixed rod, and the outer electrode is set on the quartz glass tube opposite to the inner electrode. The invention can be disassembled and replaced, which is convenient for use and later maintenance. The low-temperature plasma generated by the discharge is rich in various active particles, which has a significant enhancement effect on combustion.
Description
技术领域：Technical field:
本发明属于低温等离子体应用技术领域，特别地涉及一种本生灯式低温等离子体辅助燃烧装置。The invention belongs to the technical field of low-temperature plasma application, and in particular relates to a Bunsen burner type low-temperature plasma auxiliary combustion device.
背景技术：Background technique:
近年来，随着低温等离子体技术的发展，基于低温等离子体的助燃技术引起了国内外学者的关注。低温态等离子体具有大量的活性粒子，在降低点火延迟，提高燃烧效率上具有重要的作用，低温等离子体助燃技术也已成为各国学者研究的热点问题之一。In recent years, with the development of low-temperature plasma technology, the combustion-supporting technology based on low-temperature plasma has attracted the attention of scholars at home and abroad. Low-temperature plasma has a large number of active particles, which plays an important role in reducing ignition delay and improving combustion efficiency. Low-temperature plasma combustion-supporting technology has also become one of the hot issues studied by scholars from all over the world.
然而，目前人们对低温等离子体助燃机制的认识仍不明确，非热平衡态等离子体对燃烧特性的影响作用是一个极其复杂的理化过程，涉及电学、化学动力学、热力学和流体力学等多个学科领域，导致目前尚无有效地利用等离子体对燃烧进行精准调控的技术。国际上对于非热平衡等离子体辅助燃烧的研究主要包括等离子体助燃装置的设计、助燃效率及机理研究等方面。However, people’s understanding of the combustion-supporting mechanism of low-temperature plasma is still unclear. The effect of non-thermal equilibrium plasma on combustion characteristics is an extremely complex physical and chemical process, involving many disciplines such as electricity, chemical kinetics, thermodynamics, and fluid mechanics. As a result, there is currently no technology that effectively uses plasma to precisely control combustion. International research on non-thermal equilibrium plasma-assisted combustion mainly includes the design of plasma combustion-supporting devices, combustion-supporting efficiency and mechanism research.
根据不同应用和研究需求，研究学者设计了不同的低温等离子体辅助燃烧装置，如印度的Chintala等人采用了平板介质阻挡放电电极结构，产生了射频等离子体。俄罗斯学者A.Yu.Starikovskii等人在喷嘴处设计了介质阻挡放电发生装置，利用纳秒脉冲放电等离子体改善了火焰的传播速度。目前等离子体助燃装置设计的重点也是瓶颈是：(1)电源和高效、稳定的等离子体的电极结构的匹配。一般装置产生的等离子体面积很小，能量较高的等离子体往往面临温度过高的问题，因此，在高压环境下易发生弧光放电，而最前沿的装置需要的微波源或纳秒脉冲源又价格昂贵；(2)等离子体反应器和燃烧器结构的匹配。便于诊断的平板电极结构难以作为燃烧器使用，而广泛采用的中心电极结构面临着中心电极无法很好的固定，制作工艺复杂等弊端。According to different applications and research needs, researchers have designed different low-temperature plasma-assisted combustion devices. For example, Chintala et al. in India used a flat dielectric barrier discharge electrode structure to generate radio-frequency plasma. Russian scholar A.Yu.Starikovskii and others designed a dielectric barrier discharge generating device at the nozzle, using nanosecond pulse discharge plasma to improve the flame propagation speed. At present, the focus and bottleneck of the design of the plasma combustion-supporting device are: (1) the matching of the electrode structure of the power supply and the efficient and stable plasma. The plasma area generated by general devices is small, and the plasma with higher energy often faces the problem of high temperature. Therefore, arc discharge is prone to occur in a high-voltage environment, and the microwave source or nanosecond pulse source required by the most cutting-edge devices is also Expensive; (2) Matching of plasma reactor and burner structure. The flat electrode structure that is easy to diagnose is difficult to use as a burner, and the widely used center electrode structure faces the disadvantages that the center electrode cannot be fixed well and the manufacturing process is complicated.
发明内容：Invention content:
本发明的目的在于提供一种本生灯式低温等离子体辅助燃烧装置，可产生层流的预混火焰和扩散火焰，并将高效率、低温的等离子体作用于燃烧，明显改善燃料的燃烧特性。The purpose of the present invention is to provide a Bunsen burner low-temperature plasma-assisted combustion device, which can generate laminar premixed flame and diffusion flame, and use high-efficiency, low-temperature plasma to burn, thereby significantly improving the combustion characteristics of the fuel. .
为达到上述目的，本发明是通过以下技术方案来实现：To achieve the above object, the present invention is achieved through the following technical solutions:
一种本生灯式低温等离子体辅助燃烧装置，包括底座、气体缓冲单元和等离子体反应单元；其中，A Bunsen burner type low temperature plasma assisted combustion device, comprising a base, a gas buffer unit and a plasma reaction unit; wherein,
底座包括底板以及设置在底板上的地线接线柱；The base includes a base plate and a ground wire terminal arranged on the base plate;
气体缓冲单元包括固定法兰、法兰帽和固定棒；The gas buffer unit includes a fixed flange, a flange cap and a fixed rod;
等离子体反应单元包括外电极、内电极和石英玻璃管；The plasma reaction unit includes external electrodes, internal electrodes and quartz glass tubes;
固定法兰的底部固定在底板中心处，其中心处自下而上开设有相连通的集气腔室和阶梯孔，固定法兰的侧壁上开设有与集气腔室相连通的进气口，石英玻璃管的底部固定在阶梯孔处，顶部伸出至固定法兰外，固定棒的底部固定在底板中心处，顶部不超过固定法兰的集气腔室，法兰帽套装在石英玻璃管上，且连接在固定法兰顶部，内电极的底部固定在固定棒的顶部，顶部不超过石英玻璃管顶部，外电极套装在与内电极相对的石英玻璃管上。The bottom of the fixed flange is fixed at the center of the bottom plate, and the center is provided with a connected air collection chamber and a stepped hole from bottom to top, and the side wall of the fixed flange is provided with an air inlet connected to the air collection chamber. The bottom of the quartz glass tube is fixed at the stepped hole, the top protrudes out of the fixed flange, the bottom of the fixed rod is fixed at the center of the bottom plate, and the top does not exceed the gas collection chamber of the fixed flange. The flange cap is set on the quartz The bottom of the inner electrode is fixed on the top of the fixed rod, and the top does not exceed the top of the quartz glass tube, and the outer electrode is set on the quartz glass tube opposite to the inner electrode.
本发明进一步的改进在于，固定法兰包括螺纹连接在一起且自下而上的第一固定法兰和第二固定法兰，且第一固定法兰的中心处开设有相连通的集气腔室和阶梯孔。The further improvement of the present invention is that the fixing flange includes a first fixing flange and a second fixing flange which are screwed together from bottom to top, and the center of the first fixing flange is provided with a connected gas collection chamber Chambers and ladder holes.
本发明进一步的改进在于，内电极采用不锈钢制成的柱状电极，且内电极放电部分开设有50mm长的细牙螺纹。The further improvement of the present invention is that the internal electrode is a columnar electrode made of stainless steel, and the discharge part of the internal electrode is provided with a 50mm long fine thread.
本发明进一步的改进在于，内电极上还套装有多个同心块，且每个同心块与石英玻璃管的内壁贴合。A further improvement of the present invention lies in that a plurality of concentric blocks are set on the inner electrode, and each concentric block is bonded to the inner wall of the quartz glass tube.
本发明进一步的改进在于，同心块采用金属烧结滤芯制成。The further improvement of the present invention is that the concentric block is made of metal sintered filter element.
本发明进一步的改进在于，外电极为不锈钢网，其包裹在石英玻璃管的外壁上，其上下两端分别通过固定铝块固定。The further improvement of the present invention is that the external electrode is a stainless steel mesh, which is wrapped on the outer wall of the quartz glass tube, and its upper and lower ends are respectively fixed by fixing aluminum blocks.
本发明进一步的改进在于，不锈钢网的高度为50mm，石英玻璃管的外径为12mm，内径为8mm，内电极的直径为2mm，放电部分表面攻有50mm细牙螺纹，石英玻璃管内等离子体的反应长度为50mm，单边放电间隙为3mm。The further improvement of the present invention is that the height of the stainless steel mesh 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, the surface of the discharge part is tapped with 50mm fine thread, the plasma in the quartz glass tube The reaction length is 50mm, and the unilateral discharge gap is 3mm.
本发明进一步的改进在于，进气口外端连接有Φ8气管软，燃料气体或预混气体由此通入固定法兰内部的集气腔室，充分混合后保证最终达到管口为层流气体。The further improvement of the present invention is that the outer end of the air inlet is connected with a flexible Φ8 gas pipe, through which the fuel gas or premixed gas passes into the gas collection chamber inside the fixed flange, and after being fully mixed, it is ensured that the gas finally reaches the mouth of the nozzle as laminar flow gas.
本发明进一步的改进在于，工作时，高压电源的一端连接在外电极上，另一端接地，地线接线柱通过电阻Rm接地。A further improvement of the present invention is that, during operation, one end of the high-voltage power supply is connected to the external electrode, the other end is grounded, and the ground wire terminal is grounded through the resistor R m .
本发明进一步的改进在于，还包括示波器、高压探头、高压电源和电阻Rm，其中，高压探头与示波器连接，且高压探头和地线接线柱通过电阻Rm接地，高压探头的一端和高压电源的一端连接在外电极上，高压探头的另一端和高压电源的另一端接地，高压探头包括串联的电阻R1和电阻R2以及串联的电容C1和电容C2，串联的电阻R1和电阻R2与串联的电容C1和电容C2并联设置。A further improvement of the present invention is that it also includes an oscilloscope, a high-voltage probe, a high-voltage power supply and a resistor R m , wherein the high-voltage probe is connected to the oscilloscope, and the high-voltage probe and the ground wire terminal are grounded through the resistor R m , and one end of the high-voltage probe and the high-voltage power supply One end of the high-voltage probe is 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 includes a series resistance R 1 and a resistance R 2 and a series capacitance C 1 and capacitance C 2 , and a series connection resistance R 1 and resistance R 2 is arranged in parallel with capacitor C 1 and capacitor C 2 connected in series.
与现有技术相比，本发明具有以下的技术效果：Compared with the prior art, the present invention has the following technical effects:
本发明提供的本生灯式低温等离子体辅助燃烧装置，核心是由不锈钢内电极、不锈钢网外电极和石英玻璃管阻挡介质组成的放电单元。基于中心电极的结构，在不锈钢网上加装固定和均匀用铝块，在石英管内部配置烧结金属，保证了内电极位于中心位置；法兰内部气体充足的缓冲距离及集气腔层流保证到达管口为混合均匀的层流气体，提高燃烧的稳定性；装置材料以不锈钢为主，可靠耐用，便于携带，且考虑到实验操作时石英管可能出现破碎、污秽的情况，所述的石英管和不锈钢电极皆可更换。The core of the Bunsen burner low-temperature plasma assisted combustion device provided by the invention is a discharge unit composed 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 center electrode, an aluminum block is installed on the stainless steel net for fixing and uniformity, and sintered metal is arranged inside the quartz tube to ensure that the inner electrode is located in the center; the sufficient buffer distance of the gas inside the flange and the laminar flow of the gas collection chamber ensure the arrival The nozzle is uniformly mixed laminar flow gas, which improves the stability of combustion; the material of the device is mainly stainless steel, which is reliable, durable, and easy to carry, and considering that the quartz tube may be broken and dirty during the experimental operation, the quartz tube described Both stainless steel and stainless steel electrodes are replaceable.
本发明提供的本生灯式低温等离子体辅助燃烧装置，在常温常压下工作，不需要成本昂贵的真空设备，等离子体源选择高频交流源；放电单元能够产生高效率、均匀且富含活性成份的低温等离子体，产生的活性粒子能够参与燃烧中的链式反应进程，从而促进燃烧。The Bunsen burner type low-temperature plasma assisted combustion device provided by the present invention works at normal temperature and pressure without requiring expensive vacuum equipment, and the plasma source is a high-frequency AC source; the discharge unit can generate high-efficiency, uniform and rich The low-temperature plasma of active ingredients can produce active particles that can participate in the chain reaction process in combustion, thereby promoting combustion.
进一步，本发明适用于单纯甲烷等燃料气体或预混气体，分别对应于扩散燃烧和预混燃烧，也可以加入适量惰性气体，如氩气、氦气等气体，增加等离子体活性粒子的种类，进而产生新的反应途径。Further, the present invention is applicable to fuel gases such as simple methane or premixed gases, respectively corresponding to diffusion combustion and premixed combustion, and can also add an appropriate amount of inert gas, such as argon, helium and other gases, to increase the types of plasma active particles, This leads to new reaction pathways.
进一步，本发明提供的本生灯式低温等离子体辅助燃烧装置放电产生的低温等离子体对火焰燃烧有明显增强效果，能提高火焰传播速度和火焰温度。尤其是在稀薄燃烧条件下，低温等离子体作用会生成更多的含氧活性粒子促进燃烧，其助燃效果更为显著。Further, the low-temperature plasma generated by the discharge of the Bunsen burner-type low-temperature plasma assisted combustion device provided by the present invention has an obvious enhancement effect on flame combustion, and can increase flame propagation speed and flame temperature. Especially under lean combustion conditions, the action of low-temperature plasma will generate more oxygen-containing active particles to promote combustion, and its combustion-supporting effect is more significant.
进一步，为了解决中心电极无法很好固定的问题，内电极与石英玻璃管之间安装有两块同心块，同心块采用金属烧结滤芯制成，起到定心和防回火的作用。Further, in order to solve the problem that the central electrode cannot be fixed well, two concentric blocks are installed between the inner electrode and the quartz glass tube. The concentric blocks are made of metal sintered filter elements, which play the role of centering and anti-tempering.
进一步，为了产生密集、均匀的丝状放电，不锈钢内电极放电部分开设有50mm长的细牙螺纹。Further, in order to generate dense and uniform filamentary discharge, the discharge part of the stainless steel internal electrode is provided with a 50mm long fine thread.
进一步，为获得高效率、低温的等离子体，不锈钢网的高度为50mm，在不锈钢网边缘安装了两个固定铝块，不仅固定了不锈钢网，也起到均匀电场的作用；石英玻璃管外径为12mm，内径为8mm，不锈钢内电极直径为2mm，放电部分表面攻有50mm细牙螺纹，以产生密集、均匀的丝状放电。Further, in order to obtain high-efficiency and low-temperature plasma, the height of the stainless steel mesh is 50mm, and two fixed aluminum blocks are installed on the edge of the stainless steel mesh, which not only fixes the stainless steel mesh, but also plays a role in uniform electric field; the outer diameter of the quartz glass tube The diameter is 12mm, the inner diameter is 8mm, the diameter of the stainless steel inner electrode is 2mm, and the surface of the discharge part is tapped with 50mm fine thread to generate dense and uniform filamentary discharge.
进一步，采用中心电极的结构便于燃烧，为了解决中心电极无法很好固定的问题，不锈钢内电极与石英管之间装有两块同心块。不锈钢内电极可向下调节0～10mm，石英玻璃管管口与内电极的距离可在30～40mm之间调节，既保证放电区与燃烧区互不干扰，又保证了等离子体中的活性粒子能够促进燃烧中的链式反应进程。Further, the structure of the center electrode is used for easy combustion. In order to solve the problem that the center electrode cannot be fixed well, two concentric blocks are installed between the stainless steel inner electrode and the quartz tube. The stainless steel inner electrode can be adjusted downward by 0-10mm, and the distance between the nozzle of the quartz glass tube and the inner electrode can be adjusted between 30-40mm, which not only ensures that the discharge area and the combustion area do not interfere with each other, but also ensures that the active particles in the plasma Can promote the chain reaction process in combustion.
附图说明：Description of drawings:
图1a为本发明本生灯式低温等离子体辅助燃烧装置的结构示意图；图1b为图1a的A-A向剖视图；图1c为图1a的俯视图；图1d为图1b的B处局部视图。Fig. 1a is a schematic structural view of a Bunsen burner-type low-temperature plasma-assisted combustion device of the present invention; Fig. 1b is a sectional view along the A-A direction of Fig. 1a; Fig. 1c is a top view of Fig. 1a; Fig. 1d is a partial view at B of Fig. 1b.
图2为本发明本生灯式低温等离子体辅助燃烧装置的接线图。Fig. 2 is a wiring diagram of a Bunsen-type low-temperature plasma-assisted combustion device of the present invention.
图中：1-底板，2-地线接线柱，3-固定法兰，301-第一固定法兰，302-第二固定法兰，4-法兰帽，5-固定棒，6-石英玻璃管，7-进气口，8-内电极，9-同心块，10-固定铝块，11-示波器，12-高压探头，13-高压电源。In the figure: 1-bottom plate, 2-ground 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, 13-high voltage power supply.
具体实施方式：detailed description:
下面结合具体的实施例对本发明做进一步的详细说明，以更好地理解本发明的功能、特点。The present invention will be further described in detail below in conjunction with specific embodiments, so as to better understand the functions and characteristics of the present invention.
如图1a至图1d，本发明提供的一种本生灯式低温等离子体辅助燃烧装置，包括底座、气体缓冲单元和等离子体反应单元；其中，底座包括底板1以及设置在底板上的地线接线柱2；气体缓冲单元包括固定法兰3、法兰帽4和固定棒5；等离子体反应单元包括外电极、内电极8和石英玻璃管6；固定法兰3的底部固定在底板1中心处，其中心处自下而上开设有相连通的集气腔室和阶梯孔，固定法兰3的侧壁上开设有与集气腔室相连通的进气口7，石英玻璃管6的底部固定在阶梯孔处，顶部伸出至固定法兰3外，固定棒5的底部固定在底板1中心处，顶部不超过固定法兰3的集气腔室，法兰帽4套装在石英玻璃管6上，且连接在固定法兰3顶部，内电极8的底部固定在固定棒5的顶部，顶部不超过石英玻璃管6顶部，外电极套装在与内电极8相对的石英玻璃管6上。石英玻璃管6用作绝缘阻挡介质。As shown in Fig. 1a to Fig. 1d, a Bunsen burner type low-temperature plasma assisted combustion device provided by the present invention includes a base, a gas buffer unit and a plasma reaction unit; wherein, the base includes a bottom plate 1 and a ground wire arranged on the bottom plate Terminal post 2; the gas buffer unit includes a fixed flange 3, a flange cap 4 and a fixed rod 5; the plasma reaction unit includes an outer electrode, an inner electrode 8 and a quartz glass tube 6; the bottom of the fixed flange 3 is fixed at the center of the bottom plate 1 At the center, there is a connected gas collection chamber and a stepped hole from bottom to top, the side wall of the fixed flange 3 is provided with an air inlet 7 connected to the gas collection chamber, and the quartz glass tube 6 The bottom is fixed at the stepped hole, the top protrudes out of the fixed flange 3, the bottom of the fixed rod 5 is fixed at the center of the bottom plate 1, and the top does not exceed the gas collection chamber of the fixed flange 3, and the flange cap 4 is set on the quartz glass on the tube 6, and connected to the top of the fixed flange 3, the bottom of the internal electrode 8 is fixed on the top of the fixed rod 5, the top does not exceed the top of the quartz glass tube 6, and the outer electrode is set on the quartz glass tube 6 opposite to the internal electrode 8 . The quartz glass tube 6 serves as an insulating barrier medium.
其中，固定法兰3包括螺纹连接在一起且自下而上的第一固定法兰301和第二固定法兰302，且第一固定法兰301的中心处开设有相连通的集气腔室和阶梯孔。内电极8采用不锈钢制成的柱状电极。Wherein, the fixed flange 3 includes a first fixed flange 301 and a second fixed flange 302 that are screwed together and from bottom to top, and the center of the first fixed flange 301 is provided with a connected gas collection chamber and stepped holes. The internal electrode 8 is a columnar electrode made of stainless steel.
为了保证装置的气密性，第一固定法兰301与第二固定法兰302衔接处以及第二固定法兰302与法兰帽4衔接处均设置有密封圈。In order to ensure the airtightness of the device, sealing rings are provided at the connection between the first fixing flange 301 and the second fixing flange 302 and at the connection between the second fixing flange 302 and the flange cap 4 .
为了解决中心电极无法很好固定的问题，内电极8与石英玻璃管6之间安装有两块同心块9，同心块9采用金属烧结滤芯制成，起到定心和防回火的作用，以保证内电极8在石英玻璃管6中心。为了产生密集、均匀的丝状放电，不锈钢内电极放电部分开设有50mm长的细牙螺纹。内电极8与气体缓冲单元中的固定棒5以螺纹衔接，内电极8可向下调节0～10mm，调节前需拿下石英玻璃管6，其中，固定棒5的直径为5mm。石英玻璃管6比内电极8高出30～40mm。In order to solve the problem that the central electrode cannot be fixed well, two concentric blocks 9 are installed between the inner electrode 8 and the quartz glass tube 6. The concentric blocks 9 are made of metal sintered filter elements, which play the role of centering and anti-tempering. To ensure that the inner electrode 8 is in the center of the quartz glass tube 6 . In order to generate dense and uniform filamentary discharge, the discharge part of the stainless steel inner electrode is provided with a 50mm long fine thread. The inner electrode 8 is threadedly connected with the fixed rod 5 in the gas buffer unit. The inner electrode 8 can be adjusted downward by 0-10 mm. Before adjustment, the quartz glass tube 6 needs to be taken down. The diameter of the fixed rod 5 is 5 mm. The quartz glass tube 6 is 30-40 mm higher than the inner electrode 8 .
优选的，外电极为不锈钢网，其包裹在石英玻璃管6的外壁上，其上下两端分别通过固定铝块10固定。其中，不锈钢网的高度为50mm，石英玻璃管6的外径为12mm，内径为8mm，内电极8的直径为2mm，放电部分表面攻有50mm细牙螺纹，石英玻璃管6内等离子体的反应长度为50mm，单边放电间隙为3mm。Preferably, the external electrode is a stainless steel mesh, which is wrapped on the outer wall of the quartz glass tube 6 , and its upper and lower ends are respectively fixed by fixing aluminum blocks 10 . 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 part is tapped with 50mm fine thread, the reaction of the plasma in the quartz glass tube 6 The length is 50mm, and the discharge gap on one side is 3mm.
优选的，进气口7外端连接有Φ8气管软，燃料气体或预混气体由此通入固定法兰3内部的集气腔室，充分混合后保证最终达到管口为层流气体。Preferably, the outer end of the air inlet 7 is connected with a flexible Φ8 gas pipe, through which the fuel gas or premixed gas passes into the gas collection chamber inside the fixed flange 3, and after being fully mixed, it is ensured that the gas finally reaches the nozzle as laminar flow.
此外，本发明还包括示波器11、高压探头12、高压电源13和电阻Rm，其中，高压探头12与示波器连接，且高压探头12和地线接线柱2通过电阻Rm接地，高压探头12的一端和高压电源13的一端连接在外电极上，高压探头12的另一端和高压电源13的另一端接地，高压探头12包括串联的电阻R1和电阻R2以及串联的电容C1和电容C2，串联的电阻R1和电阻R2与串联的电容C1和电容C2并联设置。In addition, the present invention also includes an oscilloscope 11, a high-voltage probe 12, a high-voltage power supply 13 and a resistor R m , wherein the high-voltage probe 12 is connected to the oscilloscope, and the high-voltage probe 12 and the ground wire terminal 2 are grounded through the resistor R m , and the high-voltage probe 12 One end 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 includes a series resistance R1 and a resistance R2 and a series capacitance C1 and capacitance C2 , the series resistor R1 and resistor R2 are set in parallel with the series capacitor C1 and capacitor C2 .
本发明反应器材料以不锈钢为主，各部件之间可拆卸，便于维护和更换。实验操作时可将除底座之外的部分拆下，首先调节不锈钢内电极8，两者以螺纹链接，可向下调节10mm。确定内电极8高度后，依次安装第一固定法兰301、第二固定法兰302，接着放置石英玻璃管6后，再安装法兰帽4固定。此时，不锈钢内电极与石英玻璃管6的管口距离为30～40mm，保证燃烧时高温不会破坏放电的稳定性，而等离子体中的活性粒子又不至于猝灭，能够参与燃烧并促进链式反应速率。The material of the reactor of the present invention is mainly stainless steel, and the components are detachable, which is convenient for maintenance and replacement. The parts except the base can be disassembled during the experimental operation, first adjust the stainless steel inner electrode 8, the two are connected by threads, and can be adjusted downward by 10mm. After determining the height of the inner electrode 8, install the first fixing flange 301 and the second fixing flange 302 in sequence, then place the quartz glass tube 6, and then install the flange cap 4 to fix it. At this time, the distance between the stainless steel inner electrode and the quartz glass tube 6 is 30-40mm, so as to ensure that the high temperature will not damage the stability of the discharge during combustion, and the active particles in the plasma will not be quenched, so they can participate in the combustion and promote chain reaction rate.
本发明提供的本生灯式低温等离子体辅助燃烧装置的电路连接图如图2所示，进气口与Φ8气管软连接，纯甲烷等燃料气体或预混气体由此通入固定法兰3内部的集气腔室，充分混合后保证最终达到管口为层流气体。电源为用于产生低温等离子体的高压高频交流电源，等离子体产生于长度为50mm，单边放电间隙为3mm的环形柱状区域。放电时，在不锈钢网边缘的两个固定铝块相当于两个均压环，具有均匀电场的作用；不锈钢内电极放电部分表面攻有50mm细牙螺纹，以产生密集、均匀的丝状放电。本发明与串联的高压探头12和接地电阻Rm并联，高压探头12引出线接示波器11即可获得放电电压电流波形。The circuit connection diagram of the Bunsen burner type low-temperature plasma assisted combustion device provided by the present invention is shown in Figure 2, the air inlet is connected with the Φ8 gas pipe softly, and the fuel gas such as pure methane or premixed gas is thus passed into the fixed flange 3 The inner gas-collecting chamber is fully mixed to ensure that the gas finally reaches the nozzle as laminar flow. The power supply is a high-voltage and high-frequency AC power supply for generating low-temperature plasma. The plasma is generated in a circular columnar area with a length of 50mm and a discharge gap of 3mm on one side. When discharging, the two fixed aluminum blocks on the edge of the stainless steel mesh are equivalent to two equalizing rings, which have the effect of uniform electric field; the surface of the discharge part of the stainless steel inner electrode is tapped with 50mm fine thread to generate dense and uniform filamentary discharge. The present invention is connected in parallel with the high-voltage probe 12 in series and the grounding resistance R m , and the lead-out line of the high-voltage probe 12 is connected to the oscilloscope 11 to obtain the discharge voltage and current waveform.
放电开始时丝状通道逐渐产生，随着电压的升高，等离子体均匀分布在整个环形柱状区域；提高气体流速，有利于形成稳定的类辉光放电。根据实际需求，可通过调节气流速度，调节电源电压大小和频率不同调节等离子体中的活性粒子成份，获得放电均匀稳定、高效率的低温等离子体。At the beginning of the discharge, the filamentary channel is gradually generated. As the voltage increases, the plasma is evenly distributed in the entire annular columnar area; increasing the gas flow rate is conducive to the formation of a stable glow-like discharge. According to actual needs, the active particle composition in the plasma can be adjusted by adjusting the airflow speed, the power supply voltage and the frequency, so as to obtain a low-temperature plasma with uniform, stable and high-efficiency discharge.
本发明提供的本生灯式低温等离子体辅助燃烧装置主要采用不锈钢材料，运用可拆装的设计理念，便于使用与后期维护。工作环境为常温常压，不需要成本昂贵的真空设备，适用于单纯甲烷等燃料气体或预混气体，分别对应于扩散燃烧和预混燃烧。放电产生的低温等离子体对燃烧有明显增强效果，能提高火焰传播速度和火焰温度。尤其是在稀薄燃烧条件下，低温等离子体作用会生成更多的含氧活性粒子促进燃烧，其助燃效果更为显著。The Bunsen burner low-temperature plasma auxiliary combustion device provided by the present invention is mainly made of stainless steel, and adopts a detachable design concept, which is convenient for use and later maintenance. The working environment is normal temperature and pressure, and does not require expensive vacuum equipment. It is suitable for pure methane and other fuel gases or premixed gases, corresponding to diffusion combustion and premixed combustion respectively. The low-temperature plasma generated by the discharge has a significant enhancement effect on combustion, and can increase the flame propagation speed and flame temperature. Especially under lean combustion conditions, the action of low-temperature plasma will generate more oxygen-containing active particles to promote combustion, and its combustion-supporting effect is more significant.
以上所述，仅为本发明的实施案例，但本发明的保护不仅仅局限于此，任何熟悉本技术领域的技术人员在本发明披露的技术范围内，尤其是采用中心电极的介质阻挡放电结构，根据本发明的技术方案及发明构思加以移植或者改变，均应涵盖在本发明的保护范围内。The above is only an embodiment of the present invention, but the protection of the present invention is not limited thereto. Any person familiar with the technical field is within the technical scope disclosed in the present invention, especially the dielectric barrier discharge structure using the central electrode , transplantation or modification according to the technical solutions and inventive concepts of the present invention shall fall within the scope of protection of the present invention.
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