车载等离子体重整二甲醚制氢系统性能提高途径  

Approaches to Improve Performances of Onboard Hydrogen Production by Plasma Reforming of Dimethyl Ether

作　　者：马奎峰[1] 刘宁博[1] 宋凌珺[1] 李兴虎[1] 

机构地区：[1]北京航空航天大学交通科学与工程学院,北京100191

出　　处：《石油学报（石油加工）》2012年第5期798-805,共8页Acta Petrolei Sinica(Petroleum Processing Section)

基　　金：国家自然科学基金项目(21106002)资助

摘　　要：应用自制的车载等离子体富氢气体制备装置和二甲醚(DME)部分氧化重整制氢实验测量系统,进行了利用排气余热提高该反应氢产率的研究。考察了反应温度、空/醚体积比(VA/VD)和Fe基催化剂对系统性能的影响。结果表明,随着反应温度的升高,DME部分氧化重整制氢反应的DME转化率逐渐升高,H2产率先增大后减小,650℃时达最大值20.3%;温度保持为600℃时,随着VA/VD的增加,氢产率先增加后减小,在VA/VD=3.0时,H2产率取得最高值22.2%;提高温度可降低对过量空气的依赖,但高温下H2选择性小于常温下的;温度超过500℃后,以活性炭为载体的Fe基催化剂能够显著提高部分氧化的反应速率,从而提高H2产率和DME转化率。利用发动机排气废热可以提高制氢系统的综合性能,但反应温度不宜超过650℃。Experiments of hydrogen production by partial reforming of dimethyl ether（DME） with recycle of exhaust heat were carried out by using self-made measurement system and onboard plasma system. The effects of heating temperature, air-to-DME volume ratio （VA/VD） and Fe based catalyst on He yield, DME conversion rate, H2 selectivity and energy consumption were investigated. The results indicated that with the increase of heating temperature, the DME conversion rate was increased, the Hz yield increased first and then decreased, with the maximal value of 20.3% at 650℃. At 600℃, with the increase of VA/VD, the H2 yield increased initially and then decreased, with the maximal value of 22.2% at VA/VD of 3. 0. The optimal VA/VD for the highest H2 yield could be decreased by heating method, but the H2 selectivity was decreased. The Fe based catalyst clearly improved the reaction velocity when temperatures were beyond 500℃, and the H2 yield and DME conversion were both increased with the increase of heating temperature. The comprehensive performance of onboard hydrogen production system could be improved by exhaust heat recycle of engine, but the heating temperature should not exceed 650℃.

关 键 词：等离子体 二甲醚 氢气 氢产率 氢选择性 

分 类 号：U473.4[机械工程—车辆工程]