Removal of VOCs and heat distribution in a flow reversal plasma reaction system
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摘要: 将流向变换技术用于低温等离子体反应系统,考察了其对低温等离子体反应过程的影响,以放电参数(场强、频率)和系统运行参数(换向周期、接地极匝数、气体流速)为影响因素,探究了流向变换对低温等离子体系统温升(ΔT)和放电能量密度(SED)的影响,考察了该技术用于去除VOCs的情况。结果表明:在换向周期为8 min,场强为13.1 kV/cm,频率为150 Hz,接地极匝数为7匝,气体流速为14 cm/s条件下,ΔT最高可达187.3 ℃,SED最高可达284.4 J/L;等离子体放电区ΔT最高,出口处ΔT较低;蓄热段ΔT随流向变换发生周期性变化,其变化周期与反应系统的变换周期一致;将流向变换-低温等离子体反应系统应用于甲苯的去除,可以显著提升甲苯的降解率,在一定范围内,有利于提高系统的能量效率。
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关键词:
- 低温等离子体 /
- 流向变换 /
- 温升(ΔT); /
- 放电能量密度(SED) /
- 甲苯
Abstract: The reverse flow technology coupled with non-thermal plasma reaction system was used to investigate its effect on the process of non-thermal plasma reaction. Considering the influencing factors including discharge parameters(e.g. electrical field intensity, frequency) and operating parameters(e.g. cyclic period, grounding pole number, gas velocity), the effects of reverse flow on temperature rise(ΔT) and discharge energy density(SED) of the system were investigated, and the application situation of the technology in removal of VOCs was analyzed. The results showed that the highest ΔT and SED were 187.3 ℃ and 284.4 J/L under the condition of cyclic period 8 min, field intensity 13.1 kV/cm, frequency 150 Hz, grounding pole number 7 and gas velocity 14 cm/s. The ΔT of discharge area was the highest, while that of the outlet was the lowest in the system. The ΔT varied periodically with the cyclic period in the heat storage segment, whose change cycle was consistent with the period of reaction system. The degradation rate of toluene could be improved significantly by applying a flow reversal plasma reaction system, which was beneficial to improvement of the energy efficiency.-
Key words:
- non-thermal plasma /
- reverse flow /
- temperature rise(ΔT); /
- specific energy density (SED) /
- toluene
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[1] 梁文俊, 郭书清, 武红梅 , 等. 非热等离子体协同Mn-Ce/La/γ-Al2O3催化剂去除甲苯[J]. 化工学报, 2017,68(7):2755-2762.
doi: 10.11949/j.issn.0438-1157.20161656LIANG W J, GUO S Q, WU H M , et al. Removal of toluene using non-thermal plasma coupled with Mn-Ce/La/γ-Al2O3catalysts[J]. Journal of Chemical Industry and Engineering, 2017,68(7):2755-2762. doi: 10.11949/j.issn.0438-1157.20161656[2] 竹涛, 万艳东, 李坚 . 低温等离子体-催化耦合降解甲苯的研究及机理探讨[J]. 高校化学工程学报, 2011,25(1):161-167.ZHU T, WAN Y D, LI J . Study on decomposition mechanism of toluene by non-thermal plasmacoupled with catalysis[J]. Journal of Chemical Engineering of Chinese Universities, 2011,25(1):161-167. [3] VANDENBROUCKE A M, DINH M T N, NUNS N ,et al. Combination of non-thermal plasma and Pd/LaMnO3 for dilute trichloroethylene abatement[J]. Chemical Engineering Journal, 2016,283:668-675.
doi: 10.1016/j.cej.2015.07.089[4] MEI D H, ZHU X B, WU C F , et al. Plasma-photocatalytic conversion of CO2 at low temperatures:understanding the synergistic effect of plasma-catalysis[J]. Applied Catalysis B:Environmental, 2016,182:525-532.
doi: 10.1016/j.apcatb.2015.09.052[5] 杨茜, 易红宏, 唐晓龙 , 等. 低温等离子体处理工业废气中甲苯的研究进展[J]. 安全与环境工程, 2017,24(1):77-83.
doi: 10.13578/j.cnki.issn.1671-1556.2017.01.013YANG X, YI H H, TANG X L , et al. Research progress in treatment of toluene in industrial waste gas by non-thermal plasmatechnology[J]. Safety and Environmental Engineering, 2017,24(1):77-83. doi: 10.13578/j.cnki.issn.1671-1556.2017.01.013[6] WANG T, CHEN S, WANG H Q . In-plasma catalytic degradation of toluene over different MnO2 polymorphs and study of reaction mechanism[J]. Chinese Journal of Catalysis, 2017,38(5):793-804.
doi: 10.1016/S1872-2067(17)62808-0[7] HUANG H B, YE D Q . Combination of photocatalysis downstream the non-thermal plasma reactor for oxidation of gas-phase toluene[J]. Journal of Hazardous Materials, 2009,171(1/2/3):535-541.
doi: 10.1016/j.jhazmat.2009.06.033 pmid: 19604627[8] COTRELL F G . Purifying gases and apparatus therefor:US,121,733.2[P]. 1938-06-21. [9] 李霄宇, 朱吉钦, 贺振富 , 等. 丙烯腈尾气段间取热式流向变换催化燃烧[J]. 化学反应工程与工艺, 2008,24(4):305-311.LI X Y, ZHU J Q, HE Z F , et al. Catalytic combustion of acrylonitrile off-gas in a reverse flow reactor with a heat extractor[J]. Chemical Reaction Engineering and Technology, 2008,24(4):305-311. [10] 雷泽, 弓卓翡 . 低浓度甲烷流向变换催化燃烧特性研究:基于La0.8 Sr0.2Mn0.5Al0.5O3-δ/堇青石整体式催化剂[J]. 矿业科学学报, 2017,2(6):604-612.LEI Z, GONG Z F . The characteristics of reverse flow reactor for catalytic combustion of lean methane:based on La0.8Sr0.2Mn0.5Al0.5O3-δ/cordierite monolithic catalysts[J]. Journal of Mining Science and Technology, 2017,2(6):604-612. [11] QIANG L, GENG C, YING Y Z , et al. Resonance response in the catalytic combustion of methane and propane binary mixture in reverse-flow reactor[J]. Chemical Engineering Journal, 2018,345:375-388.
doi: 10.1016/j.cej.2018.03.165[12] 梁文俊, 李玉泽, 郑川 , 等. 用于低浓度一氧化碳去除的流向变换系统[J]. 北京工业大学学报, 2016: 42(9):1428-1434.
doi: 10.11936/bjutxb2015070095LIANG W J, LI Y Z, ZHENG C , et al. Reverse-flow reactor in removal of lean carbon monoxide[J]. Journal of Beijing University of Technology, 2016: 42(9):1428-1434. doi: 10.11936/bjutxb2015070095[13] 石秀娟 . 催化氧化技术用于低浓度甲烷的去除研究[D]. 北京:北京工业大学, 2017.SHI X J . Removal of low concentration of methane with catalytic oxidation technology[D]. Beijing:Beijing University of Technology, 2017. [14] 张佳瑾 . 低浓度甲烷流向变换催化燃烧实验研究及模型化[D]. 北京:北京化工大学, 2012.ZHANG J J . Environmental study modelling of reverse flow catalytic combustion process for lean methane emissions[D]. Beijing:Beijing University of Chemical Technology, 2012. [15] 区瑞锟 . 介质阻挡放电等离子体中的活性粒子及其降解甲醛的研究[D]. 广州:华南理工大学, 2011.QU R K . Active species produced by dielectric barrier discharge and their application to formaldehyde degradation[D]. Guangzhou:South China University of Technology, 2011.
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