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首页> 外文期刊>Environmental Science & Technology >Identifying/Quantifying Environmental Trade-offs Inherent in GHG Reduction Strategies for Coal-Fired Power
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Identifying/Quantifying Environmental Trade-offs Inherent in GHG Reduction Strategies for Coal-Fired Power

机译：确定/量化燃煤发电温室气体减排战略中固有的环境取舍

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摘要

Improvements to coal power plant technology and the cofired combustion of biomass promise direct greenhouse gas (GHG) reductions for existing coal-fired power plants. Questions remain as to what the reduction potentials are from a life cycle perspective and if it will result in unintended increases in impacts to air and water quality and human health. This study provides a unique analysis of the potential environmental impact reductions from upgrading existing subcritical pulverized coal power plants to increase their efficiency, improving environmental controls, cofiring biomass, and exporting steam for industrial use. The climate impacts are examined in both a traditional-100 year GWP-method and a time series analysis that accounts for emission and uptake timing over the life of the power plant. Compared to fleet average pulverized bed boilers (33% efficiency), we find that circulating fluidized bed boilers (39% efficiency) may provide GHG reductions of about 13% when using 100% coal and reductions of about 20-37% when cofiring with 30% biomass. Additional greenhouse gas reductions from combined heat and power are minimal if the steam coproduct displaces steam from an efficient natural gas boiler. These upgrades and cofiring biomass can also reduce other life cycle impacts, although there may be increased impacts to water quality (eutrophication) when using biomass from an intensely cultivated source. Climate change impacts are sensitive to the timing of emissions and carbon sequestration as well as the time horizon over which impacts are considered, particularly for long growth woody biomass.
机译：燃煤电厂技术的改进和生物质的共燃燃烧有望直接减少现有燃煤电厂的温室气体（GHG）。从生命周期的角度看，减少潜力是什么，是否会导致对空气和水质以及人类健康的意外增加，仍然存在疑问。这项研究对通过升级现有的亚临界粉煤电厂以提高效率，改善环境控制，共烧生物质以及将蒸汽输出用于工业用途而减少的潜在环境影响进行了独特的分析。在传统的100年GWP方法和时间序列分析中都研究了气候影响，该分析考虑了电厂整个生命周期内的排放和吸收时间。与船队平均粉床锅炉（效率为33％）相比，我们发现循环流化床锅炉（效率为39％）在使用100％煤时可减少约13％的温室气体，与30％混合燃烧时可减少约20-37％的温室气体％生物量。如果蒸汽副产物替代了高效天然气锅炉的蒸汽，那么热电联产所产生的额外温室气体减排量将降至最低。这些升级和共烧生物质也可以减少其他生命周期影响，尽管使用大量耕种的生物质对水质（富营养化）的影响可能会增加。气候变化的影响对排放和碳固存的时间以及考虑影响的时间范围很敏感，特别是对于长木本生物量。

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  • 来源
    《Environmental Science & Technology》 |2015年第13期|7562-7570|共9页
  • 作者

    Greg Schivley; Wesley W. Ingwersen; Joe Marriott; Troy R. Hawkins; Timothy J. Skone;

  • 作者单位

    Booz Allen Hamilton, Pittsburgh, Pennsylvania 15220, United States;

    National Risk Management Research Laboratory, Office of Research and Development, U.S. Environmental Protection Agency, Cincinnati, Ohio 45220, United States;

    Booz Allen Hamilton, Pittsburgh, Pennsylvania 15220, United States;

    National Risk Management Research Laboratory, Office of Research and Development, U.S. Environmental Protection Agency, Cincinnati, Ohio 45220, United States;

    National Energy Technology Laboratory, U.S. Department of Energy, Pittsburgh, Pennsylvania 15236, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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  • 正文语种 eng
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