摘要
纤维素燃料乙醇生产过程中由于发酵醪液质量分数较低(5%左右),精馏所需能耗较高,高能耗成为制约纤维素燃料乙醇工业化的重要原因。基于Aspen plus软件建立纤维素乙醇三塔精馏工艺的计算模型,采用NRTL活度系数模型得到物料及能量衡算结果。分别优化粗塔、常压塔和加压塔,得到各塔理论塔板数、进料位置、回流比等参数对各塔再沸器负荷的影响规律,通过优化各影响参数使综合能耗最小,为纤维素燃料乙醇生产工业化提供理论支持。
The low concentration of fermenting slurry in the process of the cellulose fuel-ethanol production led high energy consumption in distillation. The high energy consumption had became the most important reason that restrict the industrialization of cellulosic fuel-ethanol. The calculative model of cellulosic fuel-ethanol distillation with three towers was built based on NRTL activity coefficient model in Aspen plus. The mass balance and energy balance of this process was calculated. The relation between the duty of reboiler and plate number, feeding location and the reflux ratio of each towers was established by optimizing crude tower, normal pressure tower and pressurized tower. The minimum comprehensive energy consumption was got by optimizing each parameter. The results provided theoretical support for the industrialization of cellulosic fuel-ethanol production.
出处
《纤维素科学与技术》
CAS
CSCD
2016年第2期60-64,76,共6页
Journal of Cellulose Science and Technology
