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首页> 外文会议>CO2 summit II: Technology and opportunity 2016 >DIRECT AIR CATPURE VERSUS POST COMBUSTION CAPTURE FOR COAL FIRED POWER PLANTS: ENERGY BALANCE AND LIFE CYCLE ENVIRONMENTAL ASSESSMENT
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DIRECT AIR CATPURE VERSUS POST COMBUSTION CAPTURE FOR COAL FIRED POWER PLANTS: ENERGY BALANCE AND LIFE CYCLE ENVIRONMENTAL ASSESSMENT

机译：燃煤电厂的直接空气捕获与燃烧后捕获：能量平衡和生命周期环境评估

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Direct air capture (DAC) has been suggested as a possible alternative to post combustion capture (PCC), as a way to lower the climate impact of fossil-based electricity generation. However, various literature suggests that the much lower concentration of CO2 in ambient air (compared to flue gas) will cause DAC to require ～3x higher energy consumption than PCC per ton CO2 captured, in turn leading to impractically high parasitic loads, costs, and potentially other adverse environmental impacts of DAC for purposes of mitigating emissions from e.g. coal-fired power plants. Here we present a comparative techno-economic and life cycle assessment (LCA) of moisture-swing based DAC versus amine-based PCC. Our particular focus is on elucidating the energy consumption of the process, of the thermodynamic limit versus DAC versus PCC, and the relative amounts of electricity versus heat as different components of that energy consumption. This shows that the electricity consumption of moisture-based DAC is much more moderate than could have been expected. Furthermore, DAC has the capability of capturing CO2 emissions not only from coal combustion but also from all life cycle background processes of coal-based electricity. Using LCA, we show that moisture swing-based DAC can enable net-zero carbon electricity from coal while incurring only moderate increases in 10 other key environmental impacts.
机译：有人建议采用直接空气捕集（DAC）代替燃烧后捕集（PCC），以降低化石发电对气候的影响。但是，各种文献表明，与烟气相比，环境空气中的二氧化碳浓度低得多（与烟道气相比）将使DAC要求的能耗比PCC高约3倍，进而导致不切实际的高寄生负荷，成本和DAC的其他潜在潜在不利环境影响，以减轻例如燃煤电厂。在这里，我们提出了一种基于水分波动的DAC与基于胺的PCC的比较技术经济和生命周期评估（LCA）。我们特别关注的是阐明该过程的能耗，热力学极限与DAC与PCC的相对关系，以及相对于电与热量的相对量，作为该能耗的不同组成部分。这表明基于水分的DAC的耗电量比预期的要适度得多。此外，DAC不仅具有捕获煤燃烧产生的CO 2排放的能力，而且还具有捕获煤基电力的所有生命周期本底过程的能力的能力。使用LCA，我们证明了基于水分波动的DAC可以实现煤炭净零碳发电，同时仅对其他10个关键环境影响产生适度的增长。

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