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車載二甲醚水蒸氣重整制氫熱力學(xué)分析
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國(guó)家自然科學(xué)基金資助項(xiàng)目(51006128)


Thermodynamics Analysis of Hydrogen Production in Vehicle DME Steam Reforming Reaction System
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    摘要:

    針對(duì)車載二甲醚水蒸氣重整制氫反應(yīng)體系,分析了重整體系的熱力學(xué)效率;計(jì)算了體系中主要反應(yīng)的化學(xué)平衡常數(shù)隨溫度的變化關(guān)系;確立了反應(yīng)體系的獨(dú)立方程并進(jìn)行了熱力學(xué)平衡計(jì)算,研究了水醚比、溫度、壓力等對(duì)平衡的影響。結(jié)果表明:重整氣比二甲醚最高可增加15.45%的低熱值;二甲醚在溫度大于473K、水醚比大于2時(shí)具有很高的轉(zhuǎn)化率,平衡濃度接近于零;重整氣中主要成分是H2、CO和CO2,其中H2含量最高,最大濃度為72%;二甲醚中碳元素在高溫、低水醚比時(shí)主要生成CO,在低溫、高水醚比時(shí)主要生成CO2;壓力對(duì)反應(yīng)平衡濃度影響很小。

    Abstract:

    For hydrogen production in vehicle dimethyl ether (DME) steam reforming reaction system, the thermodynamic efficiency of reforming reaction system was analyzed. The change of chemical equilibrium constant in main reactions with temperature was confirmed. The effects of steam-to-DME ratio, temperature and pressure on equilibrium were studied. The results indicated that DME reformed gas increased low heat value by 15.45%. DME had a high conversion when the temperature was higher than 473K and steam-to-DME ratio was more than 2, and the equilibrium concentration was close to zero. The main components of reformed gas were H2, CO and CO2. The content of H2 showed the most, and the largest concentration was 72%. With high temperature and low steam-to-DME, carbon in DME would be converted to CO. With low temperature and high steam-to-DME, carbon in DME would be converted to CO2. Pressure had little effect on the reaction equilibrium concentration.

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鄭朝蕾,李善良.車載二甲醚水蒸氣重整制氫熱力學(xué)分析[J].農(nóng)業(yè)機(jī)械學(xué)報(bào),2013,44(9):1-6. Zheng Zhaolei, Li Shanliang. Thermodynamics Analysis of Hydrogen Production in Vehicle DME Steam Reforming Reaction System[J]. Transactions of the Chinese Society for Agricultural Machinery,2013,44(9):1-6.

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  • 在線發(fā)布日期: 2013-09-11
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