李杰

个人信息Personal Information

教授

博士生导师

硕士生导师

性别:男

毕业院校:大连理工大学

学位:博士

所在单位:电气工程学院

学科:环境工程. 电工理论与新技术. 高电压与绝缘技术

办公地点:大连理工大学电气工程学院静电所

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Reactive species distribution characteristics and toluene destruction in the three-electrode DBD reactor energized by different pulsed modes

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论文类型:期刊论文

发表时间:2018-10-15

发表刊物:CHEMICAL ENGINEERING JOURNAL

收录刊物:SCIE

卷号:350

页面范围:12-19

ISSN号:1385-8947

关键字:Nonthermal plasma; VOCs degradation; Nanosecond pulsed discharge; Pulsed polarity; Sliding discharge plasma; Three-electrode DBD reactor

摘要:This work describes the plasma degradation process of toluene in the sliding dielectric barrier discharge (DBD) reactor based on three-electrode configuration energized by + pulse, -pulse, and +/- pulse, respectively. The overall aim of this investigation is to explore the streamer propagation characteristic, spatial distribution of reactive species, and VOC degradation performance of the sliding DBD plasma under different pulsed energization conditions. The experimental result shows that the sliding DBD plasma can be ignited when the discharge electrode (electrode #1) and counter electrode (electrode #3) are energized by +/- pulse (or + pulse) and -DC, respectively, while the electrode #2 is grounded. However, the sliding DBD phenomenon cannot be observed when the two air-exposed electrodes are driven by -pulse and + DC, respectively, which can be explained on the basis of different evolution mechanisms of positive and negative streamers. Optical analysis results indicate that bipolar pulse is beneficial to the ignition of DBD plasma, which can generate more reactive species compared with unipolar pulse. The toluene degradation efficiency and energy yield increase in the sequence -pulse < + pulse < +/- pulse in the three-electrode DBD reactor. It is worth noting that remarkable improvements in toluene degradation efficiency, energy yield, and CO2 selectivity can be observed for positive pulsed discharge when a three-electrode DBD reactor is employed instead of a two-electrode one, which can be attributed to the increased amount of reactive species within the entire inter-electrode distance due to sliding DBD effect. The postdischarge gas was monitored by FT-IR analysis, the main decomposition products including CO, CO2, H2O, HCOOH and discharge products such as O-3, N2O, and HNO3 can be identified regardless of the pulsed power and discharge reactor used.