滑动弧等离子体分解二甲醚制氢

Hydrogen Generation from DME Using Gliding Arc Gas Discharge

对常温常压下滑动弧等离子体放电分解二甲醚(DME)制氢进行了研究,探讨了进气流量、电极间距、放电电压、电极形状和水/DME摩尔比以及添加的空气量对滑动弧等离子体DME转化制氢的影响。结果表明,当进气流量由43 mL·min-1增加到76 mL·min-1时,DME转化率从58.9%下降至50.6%,H2收率从26.9%下降至19.7%。随着电极间距由2 mm增加到4 mm、放电电压由11.2 kV增加到17.1kV时,DME转化率和H2收率增加,制氢能耗降低。电极最宽处有5mm平滑的竖直部分、上端电极长度50 mm,弧度23o的2#电极对DME放电反应最有利;添加水蒸汽和适量的空气对DME分解制氢反应有利,当水/DME摩尔比为2.3,添加空气的体积分数为25.8%时,DME转化率最大为74.1%,氢气的收率最大为43.4%。

Gliding arc gas discharge was used for the generation of hydrogen from dimethyl ether（DME）.Effects of reaction conditions,such as total feed gas flow rate,the electrode gap,discharge voltage,the electrode shape,H2O/DME ratio and addition amount of air,on the DME conversion and hydrogen yield were studied.The results show that,as the total feed gas flow rate increases from 43 mL·min-1 to 76 mL·min-1,DME conversion decreases from 58.9% to 50.6% and hydrogen yield decreases from 26.9% to 19.7%.As the electrode gap increases from 2 mm to 4 mm and discharge voltage increases from 11.2 kV to 17.1 kV,the DME conversion and hydrogen yield increase,while hydrogen energy consumption（SEC） decreases.It was found that the 2 electrode is most in favor to DME conversion,which has a smooth vertical part of 5 mm in the widest place of the electrode,an upper part electrode length of 50 mm and an electrode upper arc part of 23.Addition of steam and addition of air are favorable for DME conversion.When H2O/DME mole ratio is 2.3 and air volume concentration is 25.8%,the maximum DME conversion and hydrogen yield are 74.1% and 43.4%,respectively.