Nonrenewable energy cost of corn-ethanol in China.
Nonrenewable energy cost of corn-ethanol in China.
复制标题
DOI：
10.1016/j.enpol.2011.10.055
复制
发表时间：
2012-02
期刊：
影响因子：
9
通讯作者：
Qing Yang;Guoqian Chen
中科院分区：
文献类型：
--
作者：
Qing Yang;Guoqian Chen
对我国可再生生物燃料玉米乙醇的不可再生能源成本进行了核算。通过基于过程的能源分析，不可再生能源的成本在玉米乙醇生产过程中，包括农作物生产，工业转化和废水处理的保守估计为1.70倍的乙醇能源的生产，对应于负的能源回报，而不是以前报道的积极的。在以往的研究中，与废水处理相关的不可再生能源成本在能量平衡中占有重要地位。考虑到玉米乙醇的不可再生性，若将与水资源消耗、交通运输和环境修复相关的不可再生能源成本计算在内，则不可再生能源成本将增加3.64倍。由于我国不可再生能源结构以煤为主，我国玉米乙醇生产工艺主要是煤转化为乙醇。验证和讨论也揭示了政策含义，对玉米乙醇作为替代能源的长期能源安全规划。
Nonrenewable energy cost is accounted for the believed renewable biofuel of corn-ethanol in China. By a process-based energy analysis, nonrenewable energy cost in the corn-ethanol production process incorporating agricultural crop production, industrial conversion and wastewater treatment is conservatively estimated as 1.70 times that of the ethanol energy produced, corresponding to a negative energy return in contrast to the positive ones previously reported. Nonrenewable energy cost associated with wastewater treatment usually ignored in previous researches is shown important in the energy balance. Denoting the heavy nonrenewability of the produced corn-ethanol, the calculated nonrenewable energy cost would rise to 3.64 folds when part of the nonrenewable energy cost associated with water consumption, transportation and environmental remediation is included. Due to the coal dominated nonrenewable energy structure in China, corn-ethanol processes in China are mostly a conversion of coal to ethanol. Validations and discussions are also presented to reveal policy implications against corn based ethanol as an alternative energy in long term energy security planning.