Bipolar Charge Distribution of Nano Particles Passing through the Dielectric Barrier Discharge Reactor

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(1)대한기계학회 2003년도 춘계학술대회 논문집.

(2) . Bipolar Charge Distribution of Nano Particles Passing through the Dielectric Barrier Discharge Reactor Jun-Ho Ji, Suk-Hoon Kang, Jung-Hoon Byeon, Jung-Ho Hwang Key Words: Dielectric Barrier Discharge(DBD), Nano Particle ( ), Bipolar Charge ( ), Charge Distribution (

(3) ).. Abstract. Dielectric Barrier Discharges (DBD) in oxygen and air are well established for the production of large quantities of ozone and are more recently being applied to a wider range of after treatment processes for HAPs(Hazardous Air Pollutants). The potential use as a charger for particle collection are not well known. In this work, we measured charge distribution of nanometer or submicron sized particles passing through the dielectric barrier discharge reactor. The bipolar charge characteristics of particles passing DBD reactor were investigated. Fluorometric method using uranine particles and a fluorometer was employed to examine the bipolar charging characteristics of the charged particles by DBD reactor. Finally, the charge distributions of particles were determined from the electrical mobility classification using DMA. . DL. 2M. @. N8@(two-stage. electrostatic precipitator) O FG< )P. 1. . Q.. RS(AC)T ; U. (dielectric barrier discharge). VW! X YZ [S(DC). (1). !" 3. \ ]*^_! X` ) a. 0b 67O_.

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(9) 대한기계학회 2003년도 춘계학술대회 논문집. Fig. 1 Measurement procedure using fluorometric method !" . DOS, ³!´µ¶ ½ $¹_! G^-. ; X- M*^ YZ XhiL s,X . »¼ h YZ UV@L ; h-. .. . @-k ! ¾¿À(aerosol. g- ]*^ YZ%. FG

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(22) 대한기계학회 2003년도 춘계학술대회 논문집. Laminar Flow Meter. Dry Clean Air Supply System. Aerosol Conditioner Atomizer DOS. 210. Compressed Air PC. Po AC Power Supply. ~. Rotameter. CPC. DMA2. DMA1 Excess Flow. Diluter. DBD Reactor Flow Straightener. Fig. 2 Schematic diagram of TDMA method for charge distribution of particles passing DBD charger y X- YZ X hiL ,rO_! >l. - YZ ñ YZ òóô @O {. X } ÝÞ, Mß+ ](+)3 f(-)_! g. | Ù hS-. õ, DMA 3 ö. - YZ qg 09 ~9 ) a. X. *3 42 (L ÷#Xj ]_! g. @L 3 YZ X hiL ~_àj g. - YZ Ä@hi% f_! g- Ä@hiL. DMAL X TDMA(tandem differential. GhXy ~9 ) a.. mobility analyzer) }9 ; . á . {| [#(mobility diameter) YZ< 1<!. DMA MhÇ YZL UVl° |! . gQI <,ø õ @O {| ;ä. XI, DMA DBD X@L 3 X. X Y#9 n. §, DMA< hSXy ". - MhÇ YZ @O {| hiL s,. « @Â Y#I, 0b YZ< 2<! g. . DBDL 3 YZ< 1Ë X h. Qj DMA YZ 1<! g- ñ Y. iL âj DMA ÌÌ ã X. Z! hS. Û (1) Ú @O {|L. ) ;äX 0å æÄL "«e -.. Ú n1_! g- YZ% n2! g- YZL. DMA YZ hS 3, g;

(23) yv çè. "« Û.. Zo+ éê a.(9,10) Fig. 2 TDMA }_! DBD X@L 3 YZ X hiL s,X@ ( ¤Î . (1). Ëë|. h YZ UV@% ! ¾¿ÀL 3 @-k }_! UV-(4). y@

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(27) 2< _! X- YZÊ 1<! X. (2). Table 1 Classification by DMA for the monodisperse particles with the various number of charge (118 nm) The number of elementary charges Mobility diameter (nm). 1. 2. 3. 4. 5. 6. 7. 118 79. 63. 54. 48. 43. 40 37.5 35. 1686. 8. 9. 10. 11. 12. 33 31.6 30. 13. 14. 15. 16. 29 27.8 26.7 25.8.

(28) 대한기계학회 2003년도 춘계학술대회 논문집. 2000. Table 1 Û (2)L Xy [# 118 nm. 54 3 2. YZ X)% {| [#3 ùªL ". 1. Negatively charged particles. 1600. Raw count. «Q.. 3. 3.1 . Particle diameter =118 nm. 1200. 800. 400. ªL Xy Ì *^Í ©|L s, ú3L Table 2 "«Q. DBD <. 0 10. RS T 'û)< 60 Hz, 10 kV(rms) I ÐÑL 3X jü 0.64 m/sec d 10% (-)! gQ. ¡c Y# 1 Ü Y Z #$ (+)< b 60% I (-) 40%! ¡ c Y# 100 nm YZ ;

(29) (-) ! g. 14000. - YZ ©|< ý ò9 µ ) a.. 12000. 10 7 5 4 3. !" ; g- Y Raw count. YZ qgXr (+)! X- YZ ; (10). DBD

(30) {|< þ (-). ; YZ< (-)! g` ì (+)!. 2. 1. Positively charged particles Particle diameter =118 nm. 10000. Z #$ < d,ø õ, (-)! X gO_! Ä.. 1000. Fig. 4 Electrical mobility distribution for negatively charged particles. õ, X YZ b 90% (+)! gQI,. dtO_! DC. 100 Mobility diameter (nm). 8000 6000 4000. g` ì gO_! _j, @

(31) * DÈ >?` ì| Ä. +, YZ. 2000. < ñ9)¯ ù^ ñI @ .9 Äe. 0 10. @ õç , DBD X@

(32) YZ Xr. 100 Mobility diameter (nm). 1000. b7 <X| * DÈ >?` Fig. 3 Electrical mobility distribution for positively charged particles. ì Äe <ø ) a. tj YZ< 1 Ü ,|! Äj, (-)! g- YZ qg X r <X| ,@ . << ù.

(33) >?2 ÉI, N8D! Y- ò9 I. ^ . n2 X@ õç , DBD X. à; .(10). @ DÈ ] < Ä2 ÉI VÌ. Ø20 b 0.1 Ü YZ #$ b 70%. 3.2 DMA . YZ< DBDL 3X tj, 1 Ü YZ #$. ªL X YZ *^ s,. X- YZ ã b 5% ,| YZ0 DBD Table. 2. Face velocity (m/sec) 0.64 0.64 1.28. Charging characteristics penetration DBD. of. ¤Î X YZ *^ (+)2 (-)2 L µ ) a20, ,rO Xhi ù. aerosols. , ~9 )

(34) . Ø20 0b Ú Ë . Fraction of Geometric mean charged particles diameter (Ü) positive negative 0.1 0.9 0.1 1 0.6 0.4 1 0.6 0.4. DMAL. FúXy. X. TDMA(tandem. differential mobility analyzer) }9 Xj X - YZ X hiL ,rO_! s,ø ) a. Fig. 33 4 @-k }3 DMA! hS MhÇ DOS YZ< DBD

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(36) 대한기계학회 2003년도 춘계학술대회 논문집. 0.2. 0.2. Particle diamete r=118 nm Positive ly charge d particles. Particle diameter (nm) 118. 0.1. Fraction. Fraction. 175. Applied Voltage (kV) 9 10 11. 241 0.1. 0. 0.0 0. 5 10 Number of charge (n). 0. 15. 5. 10. 15. 20. 25. 30. Number of charge (n). Fig. 5 Charge distribution for positively charged particles. Fig. 7 Charge distribution of positive charged particles varying with particle diameter d.. 0.06 Particle diameter=118 nm Negatively charged particles. Fig. 5% 6 X YZ ã ÌÌ YZä X) ;äX YZ 9 "« . (+) ! g- YZ #$ 3~4<! g- YZ<. 0.04 Fraction. < 9 2XI, (+)! gYZ ¡c YZä X) Y< 9~11 kV #$, b 3.7~4.5Ë . tj (-)! X. Applied Voltage (kV) 9 10 11. 0.02. - YZ 1Ë X)L â YZ < I, ¡c YZä X) Y< 9~11 kV #$, b 0.9~1.6Ë . ú3. 0.00 0. 1. 2. 3 4 5 6 Number of charge (n). 7. DBD X@ 67 (+) . 8. 9 ) a ò9 n. (+)! g - YZ 67 ! X (+) 3 e Xy qg gr tj (-). Fig. 6 Charge distribution for negatively charged. ] gO_! O@ õç g- Y. particles. Z OI, YZä X)| gO. DMA! s, @O {| hiL "«. _! ñ ò VÌ-.. . 1<! g- YZ #$ ¤> Ä@% Ú. Xhi AC < T 'û)L Y#9. Y# 118 nm

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(38) QI, DBD XD. òóô s,-. ÌÌ 2< _! g- Y. L 3X 6@ Mjü9 0.64, 1.28, 1.92. Z {| ;äX Y# Table 1 "«. m/sec! ÷l± #$ | ? Ú. ò. _!

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(40). ßÛ7 X3 X ã< tI, ú. "« òóô @X¡c [# 100 nm YZ. YZ Ä@ Ù , (steady state) X. (+)% (-)! X- YZ 9:1 ò3. hi |\X@ õçI VÌ-. % Ú 1688.

(41) 대한기계학회 2003년도 춘계학술대회 논문집. )ç ã@*+ 'ù .2002,| Ç-F. 3, ]*^ ìÇ X #$% X. % Ú ª ú3% TDMA ú3 d ª 1 Ü YZ ú3| ^9. 6{@AËU ¾l/ *0 2T_! 1 8 òW! ùªZ yvh1 2 34.. ) a. ¯ TDMA }_! [# 1 Ü YZ XhiL s,ø )

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(45) ( (DBD) tk @L 3 YZ XhiL s,X . ] *^_! X- YZ *^Í 9 s,X@ (; }9 X I, X hiL ~@ ( ; g DMAL YZ UV3 @O {| s, ÌÌ X . Y#, < , 'û) ½ Mj ü Ù XhiL s,X . (1) DL 0.64 m/s! 3 [# 100 nm YZ #$ } ; ¤Î ú3, ](+)3 f(-)_! g YZ b 9:1 ,| . tj [# b 1 Ü YZ b 6:4 . (2) Y# 118 nm #$ @O {| hi L Xy XhiL s,X w, ](+)_! X- YZ% f(-)_! X- YZ 9:1 ,|! } ú3% ? Ú. (2) Y# <ø #$ Xhi!DE ªÇ *^Í YZä ¡c X) <X20, < , 'û), 3r Ù Xhi ? ÷<

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