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Corona Inducing Dielectric Barrier Discharge

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Corona Inducing Dielectric Barrier Discharge Corona inducing dielectric barrier discharge Jimin Zhang, Zhipeng Zhou, Taohong Ye*, Zimu Xu, Weidong Xia * Department of Thermal Science and Energy Engineering, University of Science and Technology of China, Hefei, 230027, E-mail: [email protected]; [email protected] Abstract: Dielectric barrier discharge (DBD) is a typical non-equilibrium gas discharge at atmospheric pressure. In generally, DBD with large gap requires high applied voltage and has sparse discharge channels。 DBD induced by corona is developed to produce large volume, dense discharge channels with lower applied voltage at atmosphere pressure. Graphite granules(30-70 mesh) are introduced and well-distributed in the discharge gap，the granules distort the local electric field and enhance the non-equilibrium of electric field about graphite granules. Corona discharge occurs nearby graphite granules and propagates to entire discharge gap. Such device has a low breakdown voltage cut down by approximately 40% , and more dense discharge channels are achieved. Keyword: dielectric barrier discharge, corona, breakdown voltage consisted of multineedle-to-plane discharge form, 1. Introduction was carried out to realize relatively dense plasma A plasma source of large volume is useful in between large gap[11,12]. However, the plasma industrial applications. Atmospheric pressure non- density extraordinary depends on the distribution equilibrium plasma extensively used in chemistry and numbers of needles. So, DBCD can not processes, surface modification and pollution generate genuine well-distributed plasma between control etc.. Several types of discharges, such as large gap at atmospheric pressure. glow discharge, corona discharge and DBD, have In this paper, a new discharge form called been applied to generate atmospheric plasma of corona inducing dielectric barrier discharge large volume [1-12]. Among them, corona discharge (CIDBD), with advantages of both corona and and DBD are conventional simple discharge form. DBD, was carried out to generate dense Corona discharge has very low inception atmospheric plasma between large gap under voltage, while the discharge gap is relatively lower applied voltage. Graphite granules, acting large[4,5]. Nonetheless, the distribution of plasma as vary small curvature radius of conductor, was depends on the corona electrodes, and the plasma introduced in discharge gap in a cocurrent density is inequable in the entire discharge zone. downward circulating fluidized bed. Graphite DBD device can gain dense plasma between granules, distorts local electric field and enhances small discharge gap in large area at atmospheric the non-equilibrium of electric field nearby the pressure. The DBD shows a large number of powders, corona discharge occurs relatively easily separate current filaments referred to as on the surface of powders. Therefore，the corona micro-discharges in most gases, thus appearing to plasma, nearby graphite granules, induces to the eye as bright filamentary mode plasma generate dielectric barrier discharge plasma under formation[6,7]. The existence of dielectric medium low applied voltage. (such as quartz glass) can not only restraint CIDBD has extensively application fields in rapidly increasing of current in micro-discharge chemistry processes, surface modification and channels, but also equably separate current pollution control, while the graphite granules is filamentary on entire electrodes area[8,9]. replaced by catalyst or relevant material granules. Nonetheless, dense and well-distributed DBD 2. Experimental methodology plasma can not be obtained between a large discharge gap[10]. The experimental setup is shown in Fig.1. In view of the advantages of corona and The reactor consists of an outer quartz tube(OD DBD, dielectric barrier corona discharge(DBCD), 73mm) and an inner tube (OD 48mm), with wall 1 Fig1. Schematic diagram of experimental set: 1. Distribution plate, 2. Screw feeder, 3. Leaf blade, 4. Motor, 5. Speed governor, 6. Outer electrode, 7. Inner electrode, 8. Outer quartz tube, 9. Inner quartz tube,, 10. Graphite granules, 11. Discharge zone. thickness of 2.5mm. Acopper mesh (width=10cm), density are shown in Fig.2. The current pulses of wrapped around the outside of outer tube, is used discharge, with high density of graphite granules, to be high voltage electrode. Conductor powders, are extremley dense; in the oppsite side, there are filled in the gap between inner tube and screw much fewer current pulses with a little granules; lifting device, acts as low voltage electrode. all together, the pulse current amplitude of former Therefore, the radial discharge gap width is 10 is much smaller and well-distributed than the mm and discharge volume is approximately 166 latter. As shown in Fig.2.(d), some similarly spark cm3. The screw lifting device, driven by appeared in discharge zone, this phenomenon adjustable speed motor (maximum speed 3r/s) displays that DBD is not stable and dense between inside of inner tube, was used to carry graphite large gap with low density of granules. The reason granules (30-70mesh) from the bottom of reactor is as follows: much higher applied voltage is to the top. To describe the density of graphite needed to sustain discharge between larger granules in discharge zone, the granules volume discharge gap(10mm),. The cross section of fraction is defined : discharge channel becomes larger under higher applied voltage, and more charge are transported Vgranules through a single discharge channel, that leads to V plasma spark discharge easily. When graphite granules are Vgranules is the total volume of graphite granules in located uniformly between plasma zone, the plasma zone, Vplasma is the volume of plasma zone. distribution of electric field is distorted by The density of graphite granules in plasma zone graphite granules, the partial electric field nearby was controled by regulation rotate speed of screw. the granules is enhanced to ignite plasma faintly, To drive the discharge, AC power source(1-30kV, and then, the number of discharge channels 10-30kHz) is used (CTP—2000K). In this paper, a obviously increases, and the charge transported frequency of 18.66kHz is selected. The discharge through single discharge channel comparatively power is calculated from Lissajous figure using decreases. oscilloscopes (TDS2014B). Air under room As shown in Fig.2.(c), the spatial distribution temperature was introduced in reactor. of discharge channels is comparative uniform, the photo shows a typical DBD form without arc and 3. Result and discussion spark discharge appearing. Together these reasults 3.1 Discharge waveform and photos show that well-distributed and dense DBD plasma The discharge waveforms of U-t, I-t and has been realized via the device investigated in discharge photos with different graphite granules this paper. 2 0.2 0.2 4 4 (b) 2x10 (a) f=18.66kHz 2x10 f=18.66kHz 0.1 4 0.1 1x104 1x10 0.0 0.0 0 0 Current(A) Voltage(V) Current(A) Voltage(V) 4 4 -0.1 -1x10 -0.1 -1x10 4 -2x104 -0.2 -2x10 -0.2 -5 -5 -5 -5 -6.0x10-5 -3.0x10-5 0.0 3.0x10-5 6.0x10-5 -6.0x10 -3.0x10 0.0 3.0x10 6.0x10 Time(s) Time(S) Fig2. Discharge waveforms of current, voltage and photos (UP=16.8 kV): (a, c) λ=1.5%; (b, d) λ=0.2%.(UP: peak voltage). 3.2 Effect of granules volume fraction on bate the uneven distribution caused by different breakdown voltage radius of curvature of electrodes. The gradient of As shown in Fig.3, both of the positive and curves in Fig.3 becomes greatly low when the negative breakdown voltage evidently decrease, granules volume fraction increases, especially, the while the granules volume fraction increases from gradient nearly equals to zero(λ=1.5%). Together 0 to 1.5%. When granules volume fraction equals these results show that the existence of graphite to 1.5%, positive and negative breakdown voltage granules in discharge zone can evidently reduce are approximately 18.3kV and 17.6kV, separately. breakdown voltage between large discharge gap The breakdown voltage of DBD at atmospheric under low applied voltage. pressure without graphite granules is 3.0kV/mm[5], 3.3 Effect of granules volume fraction on input therefore, the existence of granules decreases power breakdown voltage approximately 40%. Such The discharge power, shown in Fig.4, mechanism is described as follows: the existence increases with applied voltage. The growth speed of graphite granules distorts electric field to of discharge power is different under low and high generate extraordinary high partial electric field applied voltage. The turning points of gradient around granules; increasing the density of appear at points of A, B, C and D, while the granules causes high twisting of electric field, voltage at these points reaches the breakdown corona discharge occurs around granules under voltage, and DBD occurs. The applied voltage at adequate applied voltage, and then it develops to turning points reduces when the density of be DBD with increasing voltage. graphite granules increases, all together,,applied Positive breakdown voltage is higher than voltage has a ripidly reduction to gain the same negative breakdown voltage. Positive and discharge power. Especially, the power density negative breakdown voltage is equivalent in plate can reach 1W/cm3 when the particle volume to plate DBD form[8,9]. This phenomenon results fraction equals to 1.5% (applied voltage=17kV, from the different radius of curvature of anode discharge distance=10mm). However, in this and cathode[10]. The difference between positive expriement, plasma nearly can not be obtained and negative half period becomes small, while the when the quartz tube is very clean and no granules granules volume fraction increases, it indicates exists in discharge gap. that existence of granules, to some extent, can 3 4 9(2000) 340–346. 2.8x10 positive half period negative half period [2] Satiko Okazakit, Masuhiro Kogomat and 4 2.6x10 Yoshihisa Kimura. Appearance of stable 4 2.4x10 glow discharge in air, argon, oxygen and 2.2x104 nitrogen at atmospheric pressure using a 50 2.0x104 Hz source.
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