产业化浮萍发酵生产乙醇全生命周期能效与经济性评价

Industrial duckweed-based bioethanol fermentation: life-cycle energy and economy study

文章在生命周期框架上提出满足物料、能量守恒的工艺建模和动态模拟方法,以此评价浮萍发酵生产乙醇技术的产业化应用前景。通过采集筛选高淀粉株,测定其生理特征,并结合相关乙醇发酵研究,综合估算各阶段工艺反应参数。运用Superpro Designer○软件对年产规模为15万t的浮萍淀粉质乙醇发酵厂进行模拟核算后表明:单位浮萍干重(淀粉含量约为35.7%)乙醇发酵产率为理论产率(146.7±10 mg/g)的63.74%,总能效系数为2.10,项目回收期为4.79 a。浮萍乙醇成本上略低于玉米乙醇,与木薯乙醇接近,但与其他乙醇原料相比具有明显的能效优势。

In this paper, dynamic mass and energy balanced simulation and economic calculation has been proposed to evaluate industrial application prospect for technology that ethanol produced by duckweed fermentation based on life-cycle framework. High-starch duckweed strains were screened and physiologically analyzed. Reaction parameters in fermentation processes were estimated through previously study as well as literatures related. Superpro Designer simulation of annual output 150 000 t biorefinery plant established results showed that ethanol was produced from dry duckweed （35.7% starch content） in a yield on theoretical value（146.7±10 mg/g） of 63.74%, with energy output- input ratio of 2.10 and 4.79-year payback period of investment. Ethanol fuel cost from duckweed was slightly lower than corn, roughly the same with cassava, and had proved obvious advantage in energy efficiency compared with other ethanol raw materials