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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摘要

进气流量作为影响滑动电弧放电特性的关键操作参数,直接关系到滑动电弧分解CO₂的转化性能。该文拟通过实验研究进气流量对滑动电弧放电分解CO₂的电-光-热特性及其对转化性能的影响。为此搭建了滑动电弧放电的瞬态电-光-热特性同步原位诊断平台,其中,热特性通过高速纹影技术实现。借助搭建的诊断平台,开展了不同进气流量（1.5~10 L/min）下滑动电弧放电分解CO₂的实验,并对比分析进气流量对滑动电弧运动特征（即放电周期和电弧短路事件）、等离子体发光区和高温气流区面积、注入能量和CO₂转化性能参数的影响规律。实验结果表明：滑动电弧的放电周期随着进气流量的增大而减小,且变化趋势近似服从于指数衰减;等离子体发光区和高温气流区的面积均与进气流量正相关,表明进气流量的增大有利于扩大活性粒子分布区域并强化对流换热过程,从而提升CO₂的转化性能;过高的进气流量（10 L/min）会引发两类电弧短路事件,而短路事件的频繁发生会抑制滑动电弧的作用区域和对流换热过程,导致CO₂转化性能劣化。最后,提出了进气流量对滑动电弧放电分解CO₂的影响机制,将有助于理解反应器内气流与等离子体之间的相互作用关系,为反应器操作参数的调控提供指导。

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关键词 ： CO₂分解, 滑动电弧放电, 进气流量, 纹影技术, 电-光-热特性

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

收稿日期: 2023-11-08

PACS:	TM8
	O53

基金资助:

香港政府环境及自然保育基金资助项目（ECF26/2022）

通讯作者: 何俊佳男,1968年生,教授,博士生导师,研究方向为高压电器、过电压防护和放电等离子体应用。E-mail：h-junjia@vip.sina.com

作者简介: 刘洋男,1998年生,博士研究生,研究方向为大气压放电等离子体及其应用。E-mail：yangliu_ee@hust.edu.cn

引用本文:

刘洋, 章子潇, 赵贤根, 杜亚平, 何俊佳. 进气流量对滑动电弧放电分解CO₂的瞬态电-光-热特性和转化性能的影响[J]. 电工技术学报, 0, (): 231860-231860. Liu Yang, Zhang Zixiao, Zhao Xiangen, Du Yaping, He Junjia. The Effect of Inlet Flow Rate on the Transient Electrical-Optical-Thermal Characteristics and Conversion Performance of CO₂ Decomposition in Gliding Arc Discharges. Transactions of China Electrotechnical Society, 0, (): 231860-231860.

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https://dgjsxb.ces-transaction.com/CN/10.19595/j.cnki.1000-6753.tces.231860 https://dgjsxb.ces-transaction.com/CN/Y0/V/I/231860

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