【摘要】 用GIBBS最小自由能法对二甲醚(DME)自热重整制氢过程进行了热力学分析,在绝热条件下计算了反应产物中各组分的体积含量随水醚比(1～6),氧醚比(0.2～0.8)和压力(0.1MPa～0.6MPa)的变化关系。结果表明:H2的体积含量随压力的增加呈降低趋势;在标准大气压下,H2的体积含量随水醚比和氧醚比的增大都呈先增后降低趋势。氧醚比不变的条件下,随着水醚比的增加,CO与CH4的体积含量呈降低趋势,CO2的体积含量呈增加趋势。最后,在自制实验台上进行二甲醚自热重整制氢的实验研究,将该实验结果与热力学分析结果进行了对比分析,结果证明用GIBBS最小自由能法分析得到的H2,CO,CH4和CO2的体积分数随水醚比的变化趋势与实验结果较为一致。更多还原

【Abstract】 Thermodynamic analysis of hydrogen generation by auto-thermal reforming of dimethyl ether was carried out based on minimizing the Gibbs free energy of the system. The equilibrium composition of product gas was calculated at adiabatic condition as function of H2O/DME molar ratio(1~6), O2/DME molar ratio (0.2~0.8) and pressure (0.1MPa～0.6MPa). The result showed that the volume fraction of H2 decreased with the increase of pressure; with the increase of the H2O/DME ratio and the O2/DME ratio, the volume fraction of H2 increased first, then decreased at atmosphere pressure; with the increase of the H2O/DME ratio, the volume fraction of CH4 and CO decreased, while the volume fraction of CO2 increased. The model reliability was verified experimentally on self-designed equipment. The experimental data were very closed to calculated ones.更多还原