广西中粮20万吨/年木薯燃料乙醇净能量分析

Net energy analysis for annual 200 000 ton cassava ethanol production at Guangxi COFCO

摘要:

广西中粮20万吨/年木薯燃料乙醇装置建成后经历多次工艺改造，为了评估广西装置的能量投入/产出，利用国内已有的全生命周期模型进行了净能量分析。计算结果表明，广西装置的净能量为9.56 MJ/L乙醇。其中乙醇转化环节的能量投入占总能量投入的51.3%，而其中精馏工序仅蒸汽消耗即占乙醇转化总能耗的61.5%。副产品提供的能量可补偿5.03 MJ/L乙醇。因此，原料的综合利用是广西装置提高能源利用效率的重要措施，精馏工序的节能改造对净能量具有重要影响。最后展望了木薯燃料乙醇的发展前景。

关键词:木薯乙醇，全生命周期，净能量分析

Abstract:

Guangxi COFCO innovates its annual 200 000 ton cassava ethanol production in recent years. To evaluate the energy input/output of the production process, we used the domestic life cycle model. The calculation results show that the net energy value was 9.56 MJ/L ethanol. Energy input for ethanol production was 51.3% of the total. 61.5% of energy input for ethanol production was used for steam input in ethanol distillation. Energy produced from by-product was 5.03 MJ/L ethanol. Hence, efficient use of raw materials is an important measure to improve the energy efficiency in Guangxi COFCO and energy compensation from byproducts has key impact on the net energy saving.

Key words:cassava ethanol, life cycle, net energy analysis