Basic examination of membrane electrode assembly of proton exchange membrane fuel cell considering heat deterioration
Basic examination of membrane electrode assembly of proton exchange membrane fuel cell considering heat deterioration
复制标题
DOI：
10.1016/j.cherd.2010.12.010
复制
发表时间：
2011-07
影响因子：
3.9
通讯作者：
D. Tashima;Y. Sakaguchi;H. Hidaka;M. Otsubo
中科院分区：
文献类型：
--
作者：
D. Tashima;Y. Sakaguchi;H. Hidaka;M. Otsubo
对丙酮和甲苯在脱铝Y型分子筛（DAY型分子筛）上的吸附和热再生动力学进行了实验和理论研究。丙酮在DAY分子筛上的吸附等温线随温度的升高由II型变为III型，而甲苯的吸附等温线为I型。低温下丙酮的吸附量高于甲苯，但吸附亲和力较弱。由于等温线形状的不同，丙酮和甲苯表现出不同的吸附和解吸动力学行为。丙酮的穿透点比甲苯快，但达到饱和的时间晚。另一方面，在通过热氮气吹扫的再生步骤中，丙酮可以更快地从DAY-沸石床中以更高的浓度获得，因为其等温线随着温度的升高而接近III型。采用非平衡非绝热模型，结合线性驱动力模型、甲苯的Langmuir模型和丙酮的Aranovich-Donohue模型，模拟了吸附和热再生过程中的浓度和温度动态行为。研究了吹扫气速、再生温度和初始床层负荷等操作变量对再生步骤的影响。此外，比能耗和吹扫气消耗进行了评估，讨论的DAY沸石床的过程效率。
Adsorption and thermal regeneration dynamics of acetone and toluene on dealuminated Y-zeolite (DAY-zeolite) were studied experimentally and theoretically. The isotherms of acetone on DAY-zeolite changed from Type-II to Type-III with an increase in temperature, whereas the isotherms of toluene were Type-I. The adsorption amount of acetone was higher than that of toluene at low temperatures, but its adsorption affinity was weaker. Due to the differences in isotherm shape, acetone and toluene showed different adsorption and desorption dynamic behaviors. The breakthrough point of acetone was achieved faster than that of toluene, but the saturation time was reached later. On the other hand, in the regeneration step via a hot nitrogen purge, acetone could be obtained more quickly and at higher concentration from the DAY-zeolite bed because its isotherm approached Type-III with a temperature increase. A non-equilibrium and non-adiabatic model, incorporating a linear driving force model, Langmuir model for toluene and Aranovich–Donohue model for acetone, were used to simulate the dynamic behaviors of concentration and temperature during the adsorption and thermal regeneration steps. The effects of operating variables such as purge gas velocity, regeneration temperature, and initial bed loading on the regeneration step were studied. Also, the specific energy requirement and purge gas consumption were evaluated to discuss the process efficiency of the DAY-zeolite bed.