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Date of Publication:2017-01-01

Journal:高电压技术

Affiliation of Author(s):电子信息与电气工程学部

Volume:43

Issue:6

Page Number:1759-1765

ISSN No.:1003-6520

Abstract:In order to improve the intensity of plasma and the degradation
   efficiency of VOCs, the line-plate discharge device was used, and the
   porous insulating materials were attached to the low-voltage electrode,
   using the negative DC corona discharge to induce the surface
   microdischarge in the pore of insulating material on the low-voltage
   electrode. The effects of different insulating materials, film
   thickness(d), number of pores(n) and pore size(s) on the discharge
   characteristic and the formation of ozone were investigated to optimize
   the experimental parameters of the microdischarge induced by DC corona
   discharge system. The experimental results show that adhesion of porous
   insulating materials on low-voltage electrode can efficiently improve
   the plasma intensity compared with the uncovered electrode, among the
   studied materials, the porous polytetrafluoroethylene(PTFE) showed the
   best improvement. Increasing the number of holes in the insulating
   layer, decreasing the film thickness and the pore diameter can
   significantly enhance the discharge plasma intensity. Under the
   conditions of d=50 mum,n=50,s=10 mum, when the voltage is 12 kV,the
   discharge current is 1 296 muA,and the ozone concentration is 3.11 mg/L,
   which is 4.5 times and 2.2 times higher, respectively, than that of the
   uncovered low-voltage electrode. The microdischarge in porous PTFE on
   low-voltage electrode can effectively improve the degradation rate of
   toluene. When the voltage is 13 kV the degradation efficiency of toluene
   reached 58%, increased31% compared with that of uncovered electrode.

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