An Experimental Investigation of Nanosecond Pulsed Spark Discharge for High-Efficient Methane Conversion
Sun Hao1, 2, Zhang Shuai1, Han Wei3, Gao Yuan1, Wang Ruixue1, Shao Tao1, 2
1. Key Laboratory of Power Electronics and Electric Drive Institute of Electrical Engineering, Chinese Academy of Sciences Beijing 100190 China; 2. University of Chinese Academy of Sciences Beijing 100049 China; 3. Research Institute of Petroleum Processing SINOPEC Beijing 100083 China
Abstract The spark discharge, in which the gas temperature is between arc discharge and dielectric barrier discharge, has a potential for industrial methane conversion due to its high conversion rate, high conversion efficiency and low requirements. Nano-second pulse power source is able to enhance spark performance by short duration and rapid rising time, making plasma more efficient and colder. In this paper, an overall study of nanosecond pulsed spark discharge in methane has been conducted. The results show that the conversion rate of methane is 60%. The selectivity and yield of hydrogen is 44.4% and 26.6%, while those of acetylene are 28.8% and 16.8%, respectively. The total energy efficiency and hydrogen production efficiency are calculated as high as 33.9% and 23% at SEI of 170kJ/mol. Optical emission spectrum (OES) at range of 350~700nm has been recorded, in which H Balmer profiles (such as Hα, Hβ, Hγ), CH, C+ and C2 are detected. The electron density has been estimated about 1017cm-3 by the Stark effect of Hα. The evolutions of Hα, CH and C2 have been acquired by ICCD and monochromator. The electrons density decreases along with reaction time. C+ shows up as long as pulses are exerted, while CH starts to be generated at the end of pulse, which indicates C2H2 comes from recombination of CH that derives from H and C+.
Sun Hao,Zhang Shuai,Han Wei等. An Experimental Investigation of Nanosecond Pulsed Spark Discharge for High-Efficient Methane Conversion[J]. Transactions of China Electrotechnical Society, 2019, 34(4): 880-888.
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2019, Vol. 34 
