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Calcium looping for CO_2 capture from a lignite fired power plant

机译：钙循环从褐煤发电厂捕获CO_2

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摘要

Calcium looping (CaL) process is considered as a competitive technology for the capture of CO_2 emitted from fossil fuel power plants. In this process two fluidized bed reactors are coupled. In the first reactor, i.e. carbonator, CO_2 is absorbed by CaO and CaCO_3 is produced, while in the second one, referred as cal-ciner, fuel is oxy - fired, so that calcium particles, already having absorbed CO_2 in the carbonator in order to produce CO_2-rich flue gases, are regenerated. Numerous studies have focused so far on the implementation of this process in coal fired plants. However, little work has been performed in terms of lignite fired plants. Thus here, the knowledge gaps are filled by means of a thorough investigation of the particular technology using a thermodynamic approach. It is worthwhile noticing, that the analysis is conducted on an existing lignite power plant, which is already operating and is located at the wider area of Meliti, Greece (330 MW_e lignite fired power plant). For a more profound work, a series of parametric scenarios are investigated, for their optimum coupling setup, which subsequently lead to the conclusion that the energy penalty for the sorbent regeneration in cases of lignite combustion is higher than in cases of coal combustion. This is due to the higher moisture content and lower calorific value of lignite compared with coal. Finally, in order to achieve a lower energy penalty, several configurations are presented, resulting that the optimum is to burn pre-dried fuel, utilize solid heat exchanger and insert the fresh limestone inside the calciner instead of the carbonator. All configurations are evaluated in terms of CO_2 capture and net efficiency.
机译：钙循环（CaL）工艺被认为是一种捕获化石燃料发电厂排放的CO_2的竞争技术。在该过程中，将两个流化床反应器耦合。在第一个反应器（即碳酸化器）中，CO_2被CaO吸收并生成CaCO_3，而在第二个反应器（称为煅烧炉）中，将燃料进行氧燃烧，以便已经在碳酸化器中按顺序吸收了CO_2的钙颗粒产生富含CO_2的烟道气。迄今为止，许多研究都集中在燃煤电厂中该过程的实施上。然而，就褐煤燃烧的植物而言，几乎没有进行任何工作。因此，这里的知识空白是通过使用热力学方法对特定技术进行全面研究而填补的。值得注意的是，该分析是在一个现有的褐煤发电厂中进行的，该褐煤发电厂已经运行并且位于希腊梅利蒂的更广阔地区（330 MW_e褐煤发电厂）。为了进行更深入的研究，对一系列参数方案进行了研究，以了解它们的最佳耦合设置，随后得出结论，褐煤燃烧情况下吸附剂再生的能量损失比燃煤情况下的能量损失更高。这是因为与煤相比，褐煤的水分含量更高，发热量更低。最后，为了获得较低的能量损失，提出了几种配置，其结果是最佳的方法是燃烧预干燥的燃料，利用固体热交换器并将新鲜的石灰石插入煅烧炉而不是碳化器。所有配置均根据CO_2捕获和净效率进行评估。

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  • 来源
    《Fuel》 |2013年第11期|826-836|共11页
  • 作者

    Ilias Vorrias; Konstantinos Atsonios; Aristeidis Nikolopoulos; Nikos Nikolopoulos; Panagiotis Grammelis; Emmanuel Kakaras;

  • 作者单位

    Laboratory of Steam Boilers and Thermal Plants, National Technical University of Athens, 9 Heroon Polytechniou Street, 15780 Zografou, Greece Center of Research & Technology Hellas/Chemical Process and Energy Resources Institute (CERTH/CPERI), Gr-15310, Greece;

    Laboratory of Steam Boilers and Thermal Plants, National Technical University of Athens, 9 Heroon Polytechniou Street, 15780 Zografou, Greece Center of Research & Technology Hellas/Chemical Process and Energy Resources Institute (CERTH/CPERI), Gr-15310, Greece;

    Laboratory of Steam Boilers and Thermal Plants, National Technical University of Athens, 9 Heroon Polytechniou Street, 15780 Zografou, Greece Center of Research & Technology Hellas/Chemical Process and Energy Resources Institute (CERTH/CPERI), Gr-15310, Greece;

    Center of Research & Technology Hellas/Chemical Process and Energy Resources Institute (CERTH/CPERI), Gr-15310, Greece;

    Center of Research & Technology Hellas/Chemical Process and Energy Resources Institute (CERTH/CPERI), Gr-15310, Greece;

    Laboratory of Steam Boilers and Thermal Plants, National Technical University of Athens, 9 Heroon Polytechniou Street, 15780 Zografou, Greece Center of Research & Technology Hellas/Chemical Process and Energy Resources Institute (CERTH/CPERI), Gr-15310, Greece;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Calcium looping; CO_2 capture; Lignite power plant; Supercritical cycle; Post-combustion CO_2 capture;

    机译：钙循环;二氧化碳捕获;褐煤发电厂;超临界循环;燃烧后CO_2捕集;

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