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Plasma-assisted abatement of SF6 in a packed bed plasma reactor: understanding the effect of gas composition

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Plasma Science and Technology 2020年第5期22卷 95-104页

作者： Xiaoxing ZHANG Yuan TIAN zhaolun cui Ju TANG School of Electrical Engineering and Automation Wuhan UniversityWuhan 430072People's Republic of China School of Electrical and Electronic Engineering Hubei University of TechnologyWuhan 430068People's Republic of China

The potential impact of SF6 as a potent greenhouse gas on the global climate is highly *** paper studies the effect of H2O concentration,SF6 inlet concentration and pre-heating temperature on SF6 abatement in a packed bed plasma reactor in terms of the removal efficiency and products *** results showed that the best performance in SF6 abatement was obtained at 1%H2O and 100°C with 98.7%destruction and remove efficiency(DRE)at 2%*** energy yields was obtained under higher SF6 inlet ***,the existence of water vapor weakened the micro-discharge and provided H and OH radicals for this system,which showed a close relationship to removal efficiency and products *** four sulfur-containing products,SO2 F2 was more stable than SOF2,SOF4 and ***,SOF4 and SO2 were very susceptible to the above *** article provides a better understanding of SF6 abatement in a view of both scientific and engineering.

关键词： SF6 PBR plasma gas composition

Investigation on Degradation Path of SF_(6)in Packed-bed Plasma:Effect of Plasma-generated Radicals

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CSEE Journal of Power and Energy Systems 2024年第3期10卷 1231-1241页

作者： zhaolun cui Chang Zhou Amin Jafarzadeh Xiaoxing Zhang Peng Gao Licheng Li Yanpeng Hao School of Electric Power Engineering South China University of TechnologyGuangzhou 510630China School of Electrical and Electronic Engineering Hubei University of TechnologyWuhan 430068China Research group PLASMANT Department of ChemistryUniversity of AntwerpUniversiteitsplein 1BE-2610 Wilrijk-AntwerpBelgium CSEE

SF_(6)degradation mechanism in non-thermal plasma(NTP)systems is not fully understood due to the formation of a complex physico-chemical reaction network,especially when reactive gases and packing materials are *** this work,we conduct a combined experimental and theoretical study to unravel the SF_(6)degradation path in a-Al_(2)O_(3)packed plasma in the presence of H_(2)O or O_(2).Our experimental results show that both H_(2)O and O_(2)have a synergetic effect with-Al_(2)O_(3)packing on promoting SF_(6)degradation,leading to higher stable gas yields than typical spark or corona discharges.H_(2)O or O_(2)addition promotes SO_(2)or SO_(2)F_(2)selectivity,*** functional theory(DFT)calculations reveal that SO_(2)generation corresponding with the highest activation barrier is the most critical step toward SF_(6)*** like H and O generated from H_(2)O or O_(2)discharge can significantly promote the degradation process via Eley-Rideal mechanism,affecting key reactions of stable product generation,advancing degradation *** results of this work could provide insights on further understanding SF_(6)degradation mechanism especially in packed-bed plasma systems.

关键词： Degradation mechanism packed-bed plasma radicals SF_(6)

Dynamics of surface charge and electric field distributions on basin-type insulator in GIS/GIL due to voltage polarity reversal

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High Voltage 2020年第2期5卷 151-159页

作者： Yi Luo Ju Tang Cheng Pan Zijun Pan Yi Li zhaolun cui School of Electrical Engineering and Automation Wuhan UniversityWuhan 430072People's Republic of China

In this study,a simulation model of surface charge accumulation has been *** model considers three accumulation ways,*** conduction within the gas,through insulator volume and along the insulator *** generation,diffusion,drift and recombination of charge carriers are also taken into *** on it,the influence of polarity reversal,reversal time on surface charge and electric field distribution on a basin-type insulator are *** polarity of the surface charges and the direction of the electric field change after the voltage polarity *** the preload voltage is equal to reversal voltage,the surface charge and the electric field distributions at steady state before and after voltage polarity reversal are all the same with opposite sign,and not affected by the reversal ***,the time to reach the steady state varies with different reversal *** steady-state surface charge and electric field increased with the rise of reversal *** transient normal and tangential electric field would not exceed the value of the steady state,which means voltage polarity reversal has no additional influence on insulation *** research can provide guidance to the design and manufacture of DC GIS/GIL.

关键词： charge insulator polarity

Influence regularity of O_(2)on dielectric and decomposition properties of C_(4)F_(7)N-CO_(2)-O_(2)gas mixture for medium-voltage equipment

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High Voltage 2020年第3期5卷 256-263页

作者： Yi Li Xiaoxing Zhang Fanchao Ye Dachang Chen Shuangshuang Tian zhaolun cui School of Electrical Engineering and Automation Wuhan UniversityWuhan 430072People's Republic of China School of Electrical and Electronic Engineering Hubei University of TechnologyWuhanPeople's Republic of China

Fluorinated nitrile(C_(4)F_(7)N)gas mixture has been introduced as the most promising candidate to replace sulfur hexafluoride using in gas-insulated *** this study,the authors explored the influence of oxygen on the dielectric and decomposition properties of C_(4)F_(7)N–CO_(2)–O_(2)gas *** authors found that the dielectric strength of the C_(4)F_(7)N–CO_(2)–O_(2)gas mixture with 2,4,6,8 and 10%O_(2)was increased by 4.85%,6.49%,7.70%,3.21%and 2.74%compared with C_(4)F_(7)N–CO_(2).The addition of 2–6%O_(2)to the C_(4)F_(7)N–CO_(2)gas mixture could effectively reduce the content of most of the decomposition byproducts such as CF4,CO,C_(2)F_(6),C_(3)F_(6),C_(3)F_(8),CF_(3)CN,C_(2)F_(5)CN,(CN)*** high content of oxygen(>6%)results in higher decomposition of C_(4)F_(7)N,which has a negative effect on the stability of C_(4)F_(7)N gas ***,it is recommended to add 2–6%O_(2)in the C_(4)F_(7)N–CO_(2)gas mixture to improve its insulation properties as well as inhibit the decomposition of C_(4)F_(7)N in the discharge for medium-voltage engineering application.

关键词： dielectric mixture regularity

SF_(6)catalytic degradation in aγ-Al_(2)O_(3)packed bed plasma system:A combined experimental and theoretical study

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High Voltage 2022年第6期7卷 1048-1058页

作者： zhaolun cui Chang Zhou Amin Jafarzadeh Shengyan Meng Yanhui Yi Yufei Wang Xiaoxing Zhang Yanpeng Hao Licheng Li Annemie Bogaerts School of Electric Power Engineering South China University of TechnologyGuangzhouChina Department of Chemistry Research Group PLASMANTUniversity of AntwerpAntwerpBelgium School of Electrical and Electronic Engineering Hubei University of TechnologyWuhanChina School of Chemical Engineering State Key Laboratory of Fine ChemicalsDalian University of TechnologyDalianChina

Effective abatement of the greenhouse gas sulphur hexafluoride(SF_(6))waste is of great importance for the environment *** work investigates the size effect and the surface properties ofγ-Al_(2)O_(3)pellets on SF_(6)degradation in a packed bed dielectric barrier discharge(PB-DBD)*** results show that decreasing the packing size improves the filamentary discharges and promotes the ignition and the maintenance of plasma,enhancing the degradation performance at low input ***,too small packing pellets decrease the gas residence time and reduce the degradation efficiency,especially for the input power beyond 80 ***,lowering the packing size promotes the generation of SO2,while reduces the yields of S-O-F products,corresponding to a better *** the discharge,the pellet surface becomes smoother with the appearance of S and F *** functional theory calculations show that SF_(6)is likely to be adsorbed at the AlIII site over theγ-Al_(2)O_(3)(110)surface,and it is much more easily to decompose than in the gas *** fluorine gaseous products can decompose and stably adsorb on the pellet surface to change the surface element *** work provides a better understanding of SF_(6)degradation in a PB-DBD system.

关键词： packed packing decompose

Eco-friendly gas insulating medium for next-generation SF_(6)-free equipment

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iEnergy

iEnergy 2023年第1期2卷 14-42页

作者： Yi Li Shuangshuang Tian Linlin Zhong Geng Chen Song Xiao Yann Cressault Yuwei Fu Yu Zheng Christophe Preve zhaolun cui Yin Zhang Fanchao Ye Daniel Piccoz Gang Wang Yalong Li Youping Tu Wenjun Zhou Ju Tang Xiaoxing Zhang Hubei Engineering Research Center for Safety Monitoring of New Energy and Power Grid Equipment Hubei University of TechnologyWuhan 430068China School of Electrical Engineering and Automation Wuhan UniversityWuhan 430072China School of Electrical Engi-neering Southeast UniversityNanjing 210096China State Key Laboratory of Alternate Electric Power System with Renewable Energy Sources North China Electric Power UniversityBeijing 102206China LAPLACE(Laboratoire Plasma et Conversion d'Energie) Universitéde ToulouseToulouse 31013France Department of Electrical Engineering Xi’an University of TechnologyXi’an 710048China Schneider Electric Reuil-Malmaison 92500France School of Electric Power Engineering South China University of TechnologyGuangzhou 510006China

Gas-insulated equipment(GIE)that utilizes the most potent greenhouse gas sulfur hexafluoride(SF_(6))as insulation and arc-quenching medium has been widely used in the power *** eco-friendly insulating gas with advanced performance for next-generation SF_(6)-free GIE is significant for the“net-zero”goal and sustainable *** this paper,the utilization,emission,and reduction policies of SF_(6)around the world were summarized ***,we systematically reviewed the latest progress in comprehensive performance evaluation of eco-friendly insulating gas in terms of molecular design,dielectric insulation,arc-quenching,stability and decomposition,materials compatibility,biosafety,***,the representative applications of eco-friendly insulating gas in medium-voltage,high-voltage GIE as well as relevant maintenance-related technologies were ***,the existing challenges and future perspectives were proposed,presenting a roadmap to hopefully steer the development of eco-friendly insulating gas and GIE.

关键词： Eco-friendly insulating gas net-zero dielectric insulation arc-quenching SF_(6)-free gas-insulated equipment(GIE)

不同背景气体对介质阻挡放电降解SF6气体影响的实验研究

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中国电机工程学报 2018年第3期38卷 937-946页

作者：张晓星胡雄雄肖焓艳崔兆仑输配电装备及系统安全与新技术国家重点实验室(重庆大学) 重庆市沙坪坝区400044 武汉大学电气工程学院湖北省武汉市430072

由于高温室效应潜在值,SF_6被列入温室气体行列。为减少SF_6的排放,对需排放的SF_6废气进行无害化降解成为了一条有效途径。该文选择He、Ar、N2、air四种气体作为背景气体,采用双层介质阻挡放电（dielectric barrier discharge,DBD）等... 详细信息

由于高温室效应潜在值,SF_6被列入温室气体行列。为减少SF_6的排放,对需排放的SF_6废气进行无害化降解成为了一条有效途径。该文选择He、Ar、N2、air四种气体作为背景气体,采用双层介质阻挡放电（dielectric barrier discharge,DBD）等离子体技术对SF_6浓度为2%的混合气体进行降解实验研究,以研究不同的背景气体对SF_6降解的影响。放电过程中采用Q-U Lissajous图形法测量并计算放电功率。在相同频率不同输入功率条件下,考察不同背景气体下的放电特性,对不同降解时间后的SF_6浓度进行检测以获得其降解率。实验结果表明,以He和Ar为背景气体较以N2和air为背景气体容易产生均匀、稳定的DBD;以He、Ar为背景气体可以获得较好的降解效果,相对以N2和air为背景气体时完全降解消耗更少的能量和时间;从能量和降解效率角度考虑,应选择以单原子气体作为背景气体来降解SF_6。

关键词：介质阻挡放电(dielectric barrier discharge,DBD) 降解 SF6 背景气体降解率

基于紫外差分吸收光谱的痕量SO_2气体定量检测

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中国电机工程学报 2017年第19期37卷 5812-5820页

作者：周红肖淞张晓星李新程政崔兆仑武汉大学电气工程学院湖北省武汉市430072 国网湖南省电力公司检修公司湖南省长沙市410004 国网重庆市电力公司永川供电分公司重庆市永川区402160

SO_2是表征SF6绝缘电气设备内部绝缘状态的标志性气体,其准确的定量对判断绝缘设备内部故障类型及严重程度具有重要的意义。为此,该文搭建了紫外差分吸收光谱痕量SO_2气体检测系统,获取了基于Sym14小波分层处理的SO_2紫外差分吸收光谱,... 详细信息

SO_2是表征SF6绝缘电气设备内部绝缘状态的标志性气体,其准确的定量对判断绝缘设备内部故障类型及严重程度具有重要的意义。为此,该文搭建了紫外差分吸收光谱痕量SO_2气体检测系统,获取了基于Sym14小波分层处理的SO_2紫外差分吸收光谱,并在190~230及290~310nm两个特征波段对其进行快速傅里叶变换,根据变换得到的特征峰值对SO_2的浓度进行反演,得到两个波段的浓度反演曲线,并进一步探究了其检测极限。结果表明:在两个波段范围内痕量SO_2的快速傅里叶变换特征峰值与其浓度之间均存在良好的线性关系,其中190nm波段相对290nm波段具有更低的检测极限,在信噪比为3时,其检测极限可达到132.4nL/L。该研究结果为紫外差分吸收光谱技术应用于SF6特征分解组分的在线监测及SF6绝缘电气设备的故障诊断奠定了基础。

关键词：紫外差分吸收光谱 SO2 SF6 Sym14小波变换特征波段检测极限

H_2O和O_2对DBD降解高浓度SF_6影响的实验研究

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高电压技术 2019年第2期45卷 512-517页

作者：张英李亚龙崔兆仑肖焓艳张晓星贵州电网有限责任公司电力科学研究院贵阳550002 武汉大学电气与自动化学院武汉430072 输配电装备及系统安全与新技术国家重点实验室(重庆大学) 重庆400044

随着SF_6在电力行业中的应用越来越广泛,年排放量也达到了相当大的规模,由于其具有高GWP值,对SF_6降解后无害化处理就显得尤为重要。通过自行设计的DBD等离子体反应器对体积分数为2%的SF_6进行流动降解处理,分别分析了加H_2O和O_2对SF_... 详细信息

随着SF_6在电力行业中的应用越来越广泛,年排放量也达到了相当大的规模,由于其具有高GWP值,对SF_6降解后无害化处理就显得尤为重要。通过自行设计的DBD等离子体反应器对体积分数为2%的SF_6进行流动降解处理,分别分析了加H_2O和O_2对SF_6降解效率和降解产物的影响。研究表明,在单独加H_2O或O_2或两者都加时均能极大提高SF_6的降解率,使2%的高浓度SF_6降解率从60%提高到96%以上;在添加0.5%的H_2O和2%的O_2协同作用下,在50 mL/min的体积流量下SF_6降解率达到了98.2%。通过GC-MS和FTIR检测结果显示H_2O的参与使SF_6降解过程中倾向于生成SO_2,O_2的参与使SF_6降解过程中倾向于生成SO_2F2,为调节降解产物提供了研究方向。

关键词：介质阻挡放电(DBD) 降解 SF6 降解率 H2O O2