玉米燃料乙醇生命周期碳平衡分析

玉米燃料乙醇作为化石燃料的替代品,其温室气体排放的多少(净碳排放量)是评价其可持续性的一个重要标准.基于生命周期分析原理,建立了玉米燃料乙醇的碳平衡分析方法.以我国夏玉米燃料乙醇的生产为例,计算了玉米燃料乙醇生命周期的净碳排放量并对其影响因素进行了分析.研究表明:与汽油相比,目前我国夏玉米燃料乙醇的生产并不能明显减少温室气体的排放,为此玉米生产过程中氮肥施用和灌溉以及乙醇转化过程的能耗等方面有待于重点改善.

Carbon Balance Analysis of Corn Fuel Ethanol Life Cycle

The quantity of greenhouse gas emissions(net carbon emissions) of corn-based fuel ethanol,which is known as an alternative for fossil fuel is an important criteria for evaluating its sustainability.The methodology of carbon balance analysis for fuel ethanol from corn was developed based on principles of life cycle analysis.For the production state of fuel ethanol from summer corn in China,carbon budgets in overall life cycle of the ethanol were evaluated and its main influence factors were identified.It presents that corn-based fuel ethanol has no obvious reduction of carbon emissions than gasoline,and potential improvement in carbon emission of the life cycle of corn ethanol could be achieved by reducing the nitrogen fertilizer and irrigation electricity used in the corn farming and energy consumption in the ethanol conversion process.