Comparative life cycle assessment of corn stover conversion by decentralized biomass pyrolysis-electrocatalytic hydrogenation versus ethanol fermentation
Comparative life cycle assessment of corn stover conversion by decentralized biomass pyrolysis-electrocatalytic hydrogenation versus ethanol fermentation
复制标题
分散生物质热解-电催化加氢与乙醇发酵转化玉米秸秆的生命周期比较评估
DOI：
10.1039/d2se00055e
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发表时间：
2023
影响因子：
5.6
通讯作者：
Saffron, Christopher M.
中科院分区：
文献类型：
--
作者：
Das, Sabyasachi;Anderson, James E.;De Kleine, Robert;Wallington, Timothy J.;Jackson, James E.;Saffron, Christopher M.
在评价生物能源系统是否有可能取代化石能源系统时，必须通过生命周期评估量化环境影响。采用局部快速热解与电催化氢化相结合，然后进行集中加氢处理（Py-ECH）的生物能源系统可以比传统的纤维素生物炼制具有更高的碳和能源效率。进行了从摇篮到坟墓的生命周期评估，以比较Py-ECH与纤维素发酵在三个环境影响类别中的性能：气候变化、水资源短缺和富营养化。发现使用Py-ECH的液态烃生产具有比纤维素乙醇生产低得多的富营养化潜力和水稀缺足迹。更多的可再生电力导致Py-ECH加工的温室气体排放量减少。当电网电力的可再生部分高于87%时，使用Py-ECH的液态烃生产比纤维素乙醇生产具有更低的温室气体排放。敏感性分析说明了每年土壤固碳在确定全系统温室气体净排放量方面的主要作用。
Quantification of environmental impacts through life cycle assessment is essential when evaluating bioenergy systems as potential replacements for fossil-based energy systems. Bioenergy systems employing localized fast pyrolysis combined with electrocatalytic hydrogenation followed by centralized hydroprocessing (Py-ECH) can have higher carbon and energy efficiencies than traditional cellulosic biorefineries. A cradle-to-grave life cycle assessment was performed to compare the performance of Py-ECH versus cellulosic fermentation in three environmental impact categories: climate change, water scarcity, and eutrophication. Liquid hydrocarbon production using Py-ECH was found to have much lower eutrophication potential and water scarcity footprint than cellulosic ethanol production. Greater amounts of renewable electricity led to lower greenhouse gas emissions for the Py-ECH processing. When the renewable fraction of grid electricity is higher than 87%, liquid hydrocarbon production using Py-ECH has lower greenhouse gas emissions than cellulosic ethanol production. A sensitivity analysis illustrates the major role of annual soil carbon sequestration in determining system-wide net greenhouse gas emissions.