Partial oxidation of methane with air for synthesis gas production in a multistage gliding arc discharge system
Partial oxidation of methane with air for synthesis gas production in a multistage gliding arc discharge system
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DOI：
10.1016/j.ijhydene.2006.07.013
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发表时间：
2007-06
影响因子：
7.2
通讯作者：
T. Sreethawong;Piyaphon Thakonpatthanakun;S. Chavadej
中科院分区：
文献类型：
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作者：
T. Sreethawong;Piyaphon Thakonpatthanakun;S. Chavadej
传统的甲烷转化生产合成气的催化过程需要高温和高压。低温等离子体技术可以在常温条件下操作，被认为是一种很有前途的甲烷制合成气技术。采用多级滑动弧放电系统，研究了级数、原料气组成、原料气流量、频率、外加电压和电极间距对CH 4和O2转化率及产物分布的影响。该系统由四个串联的滑动弧放电反应器组成，滑动弧电极两端产生的等离子体为不同电压和频率的交流电流。在这项研究中，空气用于甲烷的部分氧化。结果表明，增加级数、电压或电极间距均能提高CH 4和O2的转化率，而增加CH 4/O2摩尔比、进料流量和频率则对转化率无明显影响。在CH 4/O2摩尔比为3/1、进料流量为150 cm ~ 3/min、频率为300 Hz的条件下，CH 4和O2的转化率最高，合成气选择性高，能耗低。滑动弧放电系统的能量消耗较低，约为2.45×10-18-2.96×10- 18 Ws（15.3-18.5eV）/分子CH 4，而针电极和平板电极电晕放电系统的能量消耗为3.36×10- 18 Ws（21 eV）/分子CH 4。
Conventional catalytic processes of CH4conversion to produce synthesis gas require both high temperatures and high pressure. Non-thermal plasma is considered to be a promising technology for the synthesis gas production from methane since it can operate in ambient conditions. In this study, a multistage gliding arc discharge system was employed to investigate the effects of stage number, feed gas composition, feed flow rate, frequency, applied voltage, and electrode gap distance on the CH4and O2conversions and the product distribution. The studied system consisted of four units of gliding arc discharge reactors connected in series, and the plasma generated across the gliding arc electrodes was AC current with different voltages and frequencies. In this study, air was used for the partial oxidation of methane. The results showed that increasing stage number, voltage, or electrode gap distance enhanced both CH4and O2conversions in contrast with the effects of increasing CH4/O2molar ratio, feed flow rate, and frequency. The optimum conditions were found at a CH4/O2molar ratio of 3/1, a feed flow rate of 150cm3/min, and a frequency of 300Hz for the maximum conversions of CH4and O2with a high synthesis gas selectivity and a very low energy consumption. The energy consumption of the gliding arc discharge system was found to be low, about 2.45×10-18–2.96×10-18Ws (15.3–18.5eV)/molecule of CH4converted as compared to 3.36×10-18Ws (21eV)/molecule of CH4converted for the corona discharge system with pin and plate electrodes.