To improve the comparability of research results in fuel ethanol industries, the cassava-based fuel ethanol industry was taken as a case. The emergy method was applied to analyze fuel ethanol production system, which is made up of three stages, planting, and transporting and ethanol production. This approach unified organically the three system of material flow, energy flow and money flow during the process, and analyzed quantitatively the integrated value of the cassava-based fuel ethanol. It overcomes shortage that the simple evaluation fuel ethanol on energy-benefit analysis or economic feasibility analysis at present. The results of the emergy assessment of fuel ethanol in China indicate the transformity is 1.10 E+06 sej/j. The emergy yield rate is 1.14. The environmental load rate is 40.9. The emergy investment rate is 32.6. The emergy sustainability index is 0.03, and the emergy assisted rate is 0.1.
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机译：为了提高燃料乙醇行业研究成果的可比性，基于木薯的燃料乙醇工业是如此。应用了旨在分析燃料乙醇生产系统的方法，该系统由三个阶段，种植和运输和乙醇生产组成。这种方法在过程中有机统一三种材料流动，能量流量和金钱流动，并定量地分析了基于木薯的燃料乙醇的集成值。它克服了简单评价燃料乙醇对当前能量效益分析或经济可行性分析的缺乏。中国燃料乙醇的最佳评估结果表明，转变为1.10 e + 06 sej / j。效率率为1.14。环境载荷率为40.9。可闻到的投资率为32.6。可持续的可持续性指数为0.03，可闻名辅助率为0.1。
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