纤维素水解发酵制燃料乙醇的过程模拟及分析

PROCESS SIMULATION AND EXERGY ANALYSIS OF CELLULOSE HYDROLYSIS AND FERMENTATION TO PRODUCE FUEL ETHANOL

通过Aspen Plus模拟纤维素制水解发酵制取燃料乙醇工艺的仿真模型并计算全流程数据。对系统进行分析,计算主要单元的流、损失和效率。研究结果表明:计算获得工艺的物流和能流数据,可作为生命周期评价的基础;当进口秸秆原料参考江苏省内玉米秸秆收集资源量年输入242万t时,原料利用率达到23.10%,因此该工艺具有工程实践的潜力;粗馏塔的损失占系统41.61%为最大,因为该单元中流量存在较大变化;系统损失分布中粗馏塔和其他部件损失占比较高,因此为优化系统能量结构,水循环、热循环、锅炉燃烧系统还需优化调整。

In this paper,a simulation model for the preparation of fuel ethanol by hydrolysis of cellulose was established and simulated by Aspen Plus.A exergy analysis of the system was performed to calculate the exergy flows,exergy loss,and exergy efficiency of the major units.The research results show that the calculation data of the mass flows and energy flows can be the basis of the life cycle assessment;when the imported materials refer to the amount of corn straw collected in Jiangsu Province,the annual input reaches 2.42 million tons,the utilization rate of imported materials reaches 23.10%,so the process has the potential of engineering practice.The exergy loss of the crude distillation tower accounts for 41.61%of the system is the largest,because there is a large change in the flow rate in the unit;the loss of the rough tower and other components in the system exergy loss distribution is relatively high.Therefore,in order to optimize the system energy structure,the water circulation,thermal cycle,and boiler combustion system need to be optimized.