甜高粱茎秆乙醇全生命周期分析

Life Cycle Assessment on Fuel Ethanol Producing from Sweet Sorghum Stalks

针对内蒙古地区甜高粱种植和甜高粱茎秆先进固体发酵技术,构建全生命周期分析模型,以及甜高粱种植中化肥、农药等的能量投入数据库,对能耗、温室气体排放及其影响因素进行全生命周期分析。结果表明,能量投入为34 831 MJ/t,乙醇生产阶段和甜高粱生产阶段是主要能耗阶段;甜高粱乙醇的能量产出为46 562 MJ/t,净能值为11 730.97 MJ/t,能量产出投入比为1.34,CO2排放量为93.23 g/MJ。从能源角度来看,利用甜高粱茎秆生产燃料乙醇是可行的。

Aiming at the technologies of sweet sorghum planting and advanced solid state fermentation（ASSF） in Inner Mongolia,a life cycle assessment（LCA） model on energy consumption,greenhouse gas emissions and other relative impact factors was established together with a database of fertilizer,pesticide and other energy inputs.The model showed that the energy input was 34 831 MJ/t and mainly distributed in sweet sorghum planting and ethanol producing phases.The energy output,net energy produced,energy-making efficiency and CO2 emissions were 46 562 MJ/t,11 730.97 MJ/t,1.34 and 93.23 g/MJ,respectively.The results showed sweet sorghum ethanol making was feasible from the view point of energy production.