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Energy efficiency and potentials of cassava fuel ethanol in Guangxi region of China

机译：中国广西地区的木薯燃料乙醇的能效和潜力

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The Guangxi Zhuang autonomous region has plentiful cassava resources, which is an ideal feedstock for fuel ethanol production. The Guangxi government intends to promote cassava fuel ethanol as a substitute for gasoline. The purpose of this study was to quantify the energy efficiency and potentials of a cassava fuel ethanol project in the Guangxi region based on a 100 thousand ton fuel ethanol demonstration plant at Qinzhou of Guangxi. The net energy value (NEV) and net renewable energy value (NREV) are presented to assess the energy and renewable energy efficiency of the cassava fuel ethanol system during its life cycle. The cassava fuel ethanol system was divided into five subsystems including the cassava plantation/treatment, ethanol conversion, denaturing, refueling and transportation. All the energy and energy related materials inputs to each subsystem were estimated at the primary energy level. The total energy inputs were allocated between the fuel ethanol and its coproducts with market value and replacement value methods. Available lands for a cassava plantation were investigated and estimated. The results showed that the cassava fuel ethanol system was energy and renewable energy efficient as indicated by positive NEV and NREV values that were 7.475 MJ/L and 7.881 MJ/L, respectively. Cassava fuel ethanol production helps to convert the non-liquid fuel into fuel ethanol that can be used for transportation. Through fuel ethanol production, one Joule of petroleum fuel, plus other forms of energy inputs such as coal, can produce 9.8 J of fuel ethanol. Cassava fuel ethanol can substitute for gasoline and reduce oil imports. With the cassava output in 2003, it can substitute for 166.107 million liters of gasoline. With the cassava output potential, it can substitute for 618.162 million liters of gasoline. Cassava fuel ethanol is more energy efficient than gasoline, diesel fuel and corn fuel ethanol but less efficient than biodiesel.
机译：广西壮族自治区木薯资源丰富，是生产燃料乙醇的理想原料。广西政府计划推广木薯燃料乙醇替代汽油。这项研究的目的是基于广西钦州的一座10万吨燃料乙醇示范工厂，对广西地区的木薯燃料乙醇项目的能源效率和潜力进行量化。介绍了净能量值（NEV）和净可再生能量值（NREV），以评估木薯燃料乙醇系统在其生命周期内的能源和可再生能源效率。木薯燃料乙醇系统分为五个子系统，包括木薯种植/处理，乙醇转化，变性，加油和运输。每个子系统的所有与能源和能源相关的材料输入均在一次能级下估算。总能量输入通过市场价值和重置价值方法在燃料乙醇及其副产品之间分配。对木薯人工林的可用土地进行了调查和估算。结果表明，木薯燃料乙醇系统具有能源效率和可再生能源效率，NEV和NREV的正值分别为7.475 MJ / L和7.881 MJ / L。木薯燃料乙醇的生产有助于将非液体燃料转化为可用于运输的燃料乙醇。通过燃料乙醇的生产，一焦耳的石油燃料加上其他形式的能源输入，例如煤，可以生产9.8焦耳的燃料乙醇。木薯燃料乙醇可以代替汽油并减少石油进口。凭借2003年的木薯产量，它可以替代1,661.70万升的汽油。凭借木薯的输出潜力，它可以替代6.6182亿升汽油。木薯燃料乙醇比汽油，柴油燃料和玉米燃料乙醇更具能源效率，但比生物柴油效率低。

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