进气流量对滑动电弧放电分解CO<sub>2</sub>的瞬态电-光-热特性和转化性能的影响

doi:10.19595/j.cnki.1000-6753.tces.231860

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Abstract The rising concentration of carbon dioxide (CO₂) is recognized as one of the most challenges in the 21st century. Non-equilibrium plasma can activate the reaction of CO₂ decomposition at room temperature and pressure due to the abundant active particles. Gliding arc discharge (GAD), as a non-equilibrium plasma production method, has attracted the attention of researchers because of the high energy efficiency for CO₂ decomposition. The inlet flow rate, as a key operational parameter, is directly related to the conversion performance of CO₂ decomposition in GAD. However, current studies mainly focus on the CO₂ conversion performance and lack the direct observation of the arc motion, optical, and thermal morphology. To address these issues, this paper aims to investigate the effect of inlet flow rate on the transient electrical-optical-thermal characteristics and conversion performance of CO₂ decomposition in GAD by experiment.
Firstly, an in-situ diagnostic platform for transient electrical-optical-thermal characteristics is built in this paper, in which the thermal characteristic is visualized by a high-speed Schlieren technology. Then, by using the diagnostic platform, this paper carries out the experiments of CO₂ decomposition in gliding arc discharge under different inlet flow rates (1.5 L/min to 10 L/min). Typical gliding arc discharge results show that Schlieren images are an essential supplement to traditional mono-optical observation by revealing a high-temperature flow region composed of a high-temperature core and a high-temperature diffuse region.
The effects of the inlet flow rate on the motion characteristic in GAD (i.e., the discharge period and the arc short-circuit event), the area of the plasma luminescence and the high-temperature gas flow regions, the input energy, and the CO₂ conversion performance parameters are compared and analyzed. The experimental results show that the discharge period decreases with the increase of the inlet flow rate, and the tendency follows an exponential decay distribution approximately. The areas of the plasma luminescence and high-temperature gas flow regions are positively correlated with the inlet flow rate, indicating that the increase in the inlet flow rate facilitates the expansion of the active particle and the enhancement of the heat convective to improve CO₂ conversion. Two types of arc short-circuit events are induced by excessive inlet flow (10 L/min). The gliding region of GAD and the heat convection are suppressed due to frequent short-circuit events, resulting in the deterioration of CO₂ conversion.
The following conclusions can be drawn: (1) the discharge period decreases with the increase of the inlet flow rate, and the tendency follows an exponential decay distribution approximately. (2) There are two types of arc short-circuit events in gliding arc discharge: one is formed between the arc columns by electrical breakdown, and the other is formed in the near-cathode region by thermal breakdown. (3) The plasma luminescence area and high-temperature gas flow area increase with the inlet flow rate in a limited range, and reduce at excessive flow rates due to frequent arc short-circuit events. (4) The role of the inlet flow rate on CO₂ conversion is mainly determined by the combined effect of gas residence time, active particle concentration and spatial distribution, heat convection, and short-circuit events.

Key words： CO₂ decomposition gliding arc discharge inlet flow rate Schlieren technology electrical-optical-thermal characteristics

Received: 08 November 2023

PACS:	TM8
	O53

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	Liu Yang
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Liu Yang,Zhang Zixiao,Zhao Xiangen等. The Effect of Inlet Flow Rate on the Transient Electrical-Optical-Thermal Characteristics and Conversion Performance of CO₂ Decomposition in Gliding Arc Discharges[J]. Transactions of China Electrotechnical Society, 2024, 39(23): 7616-7627.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.231860 OR https://dgjsxb.ces-transaction.com/EN/Y2024/V39/I23/7616

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