中国小麦燃料乙醇的能量收益

分析了燃料乙醇能量收益问题提出的背景,国外有关燃料乙醇能量收益研究的最新进展及国内研究现状,采用全生命周期分析方法,计算了小麦燃料乙醇净能量值和能量产投比,对中国小麦燃料乙醇的能量收益进行了评价。主要结论有:如不考虑副产品能量价值,旧工艺和新工艺的NEV分别为-17022MJ/t燃料乙醇和-11778MJ/t燃料乙醇,R值分别是0.64和0.72;如考虑副产品能量价值,旧工艺和新工艺的NEV值分别为2271MJ/t燃料乙醇和11249MJ/t燃料乙醇,R值分别是1.05和1.27,从能源经济性角度看,旧工艺和新工艺的能量收益已是正效益,且新工艺的能量收益显著提高;与美国玉米燃料乙醇生产相比,如考虑副产品能量价值,新工艺和美国玉米燃料乙醇的NEV分别为11249MJ/t燃料乙醇和7457MJ/t燃料乙醇,R值分别是1.27和1.34。由于小麦转化率要低于玉米,因而小麦燃料乙醇的R值会低于玉米燃料乙醇。中国小麦燃料乙醇生产(新工艺)NEV大于美国玉米燃料乙醇的原因在于:中国小麦燃料乙醇副产品综合利用水平(23027MJ/t燃料乙醇)已明显优于美国玉米燃料乙醇(5078MJ/t燃料乙醇)。

Energy gain of wheat ethanol in China

The paper analyzed the research background of ethanol energy gain,its latest developments in the world and research statue in China.Furthermore,based on the lifecycle analysis,the paper calculated the net energy value and energy output-input ratio of wheat fuel ethanol,and evaluated the energy gain of wheat fuel ethanol in China.The main conclusions are as follow:If the energy of byproduct was not being calculated,The Net energy values in old and new technology were-17022 MJ/t and-11778 MJ/t fuel ethanol,and the values of R were 0.64 and 0.72,respectively.If the energy of byproduct was being calculated,The Net energy values in old and new technology were 2271 MJ/t and 11249 MJ/t fuel ethanol,and the values of R were 1.05 and 1.27,respectively.The energy gains,which were significantly improved by the new technology,in old and new technology are both positive benefits according to the economic benefit of energy.Compared with the corn fuel ethanol production in America,with the calculation of byproduct's energy,the net energy values in new and American technology were 11249 MJ/t and 7457 MJ/t fuel ethanol,and the values of R were 1.27 and 1.34,respectively.R in wheat fuel ethanol is lower than in corn fuel ethanol due to higher conversion in corn relative to wheat.Chinese technology for the production of wheat fuel ethanol(new technology)has greater net energy value in comparison with American technology,which is because the advantages for comprehensive utilization of wheat fuel ethanol in China(23027 MJ/t ethanol)were evident relative to the corn fuel ethanol production in America(5078 MJ/t ethanol).