纳秒脉冲火花放电高效转化甲烷的实验研究

doi:10.19595/j.cnki.1000-6753.tces.180032

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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 H_α, H_β, H_γ), CH, C⁺ and C₂ are detected. The electron density has been estimated about 10¹⁷cm^-3 by the Stark effect of H_α. The evolutions of H_α, CH and C₂have 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⁺.

Key words： Methane non-oxidative conversion nanosecond pulsed spark discharge optical emission spectrum electron density

Received: 08 January 2018 Published: 01 March 2019

PACS:	O461
	O539
	O646.9

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	Sun Hao
	Zhang Shuai
	Han Wei
	Gao Yuan
	Wang Ruixue
	Shao Tao

Cite this article:

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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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.180032 OR https://dgjsxb.ces-transaction.com/EN/Y2019/V34/I4/880

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