DBD放电中温度特性与OH促进NO氧化过程光谱诊断 |
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引用本文: | 余利群,高翔,郑成航,许希,竺新波,刘璐,骆仲泱.DBD放电中温度特性与OH促进NO氧化过程光谱诊断[J].能源工程,2013(5):29-35. |
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作者姓名: | 余利群 高翔 郑成航 许希 竺新波 刘璐 骆仲泱 |
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作者单位: | 浙江大学清洁能源利用国家重点实验室,浙江杭州310027 |
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基金项目: | 基金项目:国家杰出青年科学基金资助项目(51125025);国家自然科学基金资助项目(51076140,51206143) |
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摘 要: | 利用光谱诊断方法深入研究了介质阻挡放电(DBD)中气体分子温度分布,OH自由基促进NO分子氧化过程的光谱特性,获得了NO(A^2∑^+→X^2П,0—3,1—4)、N2(C^3Пu→B^3Пg,0—0)和OH(A^2∑^+→X^2П,0—0)的高分辨率发射光谱。通过拟舍得到NO(A^2∑^+→X^2П)转动带253—260nm的谱线,将其与实验谱线进行比较,获得了DBD放电区域的气体分子温度;发现在放电通道内气体分子温度分布较为均衡,但靠近内电极气体分子温度约为330K,略高于介质附近的310K。研究了N2与NO谱线强度的一维分布,发现在放电通道中间位置处谱线强度最高,从中间往内外电极方向谱线强度均逐渐降低。随着交流电压的升高,NO与OH谱线强度均升高,高能电子能有效地激发OH与NO基团。随着相对湿度从20%升高到100%,NO谱线强度降低约93%;随着NO浓度升高,OH谱线强度呈现下降的趋势,NO浓度从200mL/m^3升高到600mL/m^3时,OH谱线强度下降约27%。说明OH基团对NO氧化过程中起到重要作用。
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关 键 词: | 介质阻挡放电 光谱诊断 转动温度 分子温度 NO转化 |
Optical study of temperature characteristic and NO oxidization process by OH radicals in DBD by Optical Emission Spectroscopy |
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Affiliation: | YU Li-qun, GAO Xiang, ZHENG Cheng-hang, et al (State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China) |
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Abstract: | The optical spectroscopy characteristic of dielectric barrier discharge (DBD) plasma in NO/H2O/N2 mixture was studied by Optical Emission Spectroscopy ( OES). DBD plasmas was generated in a 4mm wire-cylinder gap in atmospheric - pressure, spectrum of NO ( A^2 ∑ + → X^2П,0 → 3,1 - 4 ) , N2 ( C^3Пu→B3 Пg, 0 - 0 ) and OH ( A2 ∑^+ →X2П,0- 0) was observed. The plasma gas temperature was determined by comparing the experimental spectrum and the best fitted spectrum. From the NO( A^2∑ →X^2П,0 -3,1 -4) rotational transition band, the temperature was about 320K. One-dimensional distribution of NO ( A^2 ∑ + →X^2 П,0 - 3 ) and N2 ( C3 Пu→B^3 П g, 0 - 0) emission intensity was obtained. When RH = 20% , OH emission intensity reached the maximum. As the peak voltage increased, NO (A^2∑ +→X^2П ,0- 0) and OH ( A^2∑^+ →X^2П ,0 -0) emission intensity rised. As the RH increased, NO emission intensity decreased, emission intensity decreased about 93% when RH = 100% compared with RH = 20% ; NO concentration increased, OH emission intensity decreased, emission intensity decreased about 27% at NO concentration of 600mL/m3 compared with NO concentration of 200mL/m3 , which could reveal the importance of OH radicals in NO conversion process. |
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Keywords: | DBI) Optical Emission Spectroscopy rotational transition rotational temperature NO conversion |
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