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首页> 外文期刊>Environmental Research Letters >Well-to-wheels energy use and greenhouse gas emissions of ethanol from corn, sugarcane and cellulosic biomass for US use
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Well-to-wheels energy use and greenhouse gas emissions of ethanol from corn, sugarcane and cellulosic biomass for US use

机译：从美国使用的玉米，甘蔗和纤维素生物质中轮到车轮的能源消耗和温室气体排放的乙醇

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Globally, bioethanol is the largest volume biofuel used in the transportation sector, with corn-based ethanol production occurring mostly in the US and sugarcane-based ethanol production occurring mostly in Brazil. Advances in technology and the resulting improved productivity in corn and sugarcane farming and ethanol conversion, together with biofuel policies, have contributed to the significant expansion of ethanol production in the past 20?years. These improvements have increased the energy and greenhouse gas (GHG) benefits of using bioethanol as opposed to using petroleum gasoline. This article presents results from our most recently updated simulations of energy use and GHG emissions that result from using bioethanol made from several feedstocks. The results were generated with the GREET (Greenhouse gases, Regulated Emissions, and Energy use in Transportation) model. In particular, based on a consistent and systematic model platform, we estimate life-cycle energy consumption and GHG emissions from using ethanol produced from five feedstocks: corn, sugarcane, corn stover, switchgrass and miscanthus.We quantitatively address the impacts of a few critical factors that affect life-cycle GHG emissions from bioethanol. Even when the highly debated land use change GHG emissions are included, changing from corn to sugarcane and then to cellulosic biomass helps to significantly increase the reductions in energy use and GHG emissions from using bioethanol. Relative to petroleum gasoline, ethanol from corn, sugarcane, corn stover, switchgrass and miscanthus can reduce life-cycle GHG emissions by 19–48%, 40–62%, 90–103%, 77–97% and 101–115%, respectively. Similar trends have been found with regard to fossil energy benefits for the five bioethanol pathways.
机译：在全球范围内，生物乙醇是交通运输领域中使用量最大的生物燃料，玉米基乙醇的生产主要发生在美国，而甘蔗基乙醇的生产主要发生在巴西。技术的进步以及由此带来的玉米和甘蔗种植业生产率的提高以及乙醇转化以及生物燃料政策，在过去20年中大大促进了乙醇生产。与使用石油汽油相比，这些改进增加了使用生物乙醇在能源和温室气体（GHG）方面的优势。本文介绍了我们最新更新的能源使用和温室气体排放模拟得出的结果，这些模拟结果是使用几种原料制成的生物乙醇所产生的。结果是通过GREET（温室气体，管制排放量和运输中的能源使用量）模型生成的。特别是，基于一个一致且系统的模型平台，我们通过使用以下五种原料生产的乙醇（玉米，甘蔗，玉米秸秆，柳枝and和猕猴桃）估算出生命周期的能源消耗和温室气体排放量，并定量解决了一些关键问题的影响。影响生物乙醇生命周期温室气体排放的因素。即使包括备受争议的土地利用变化，温室气体的排放量，从玉米到甘蔗再到纤维素生物质的变化，也有助于显着增加使用生物乙醇的能源使用量和温室气体排放量的减少。与石油汽油相比，玉米，甘蔗，玉米秸秆，柳枝and和桔梗中的乙醇可以将生命周期内的温室气体排放量减少19–48％，40–62％，90–103％，77–97％和101–115％，分别。在五种生物乙醇途径的化石能源收益方面也发现了类似的趋势。

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