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Prediction of distribution of trace elements under Oxy-fuel combustion condition using Victorian brown coals

机译：使用维多利亚褐煤预测含氧燃料燃烧条件下微量元素的分布

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摘要

In reducing CO_2 emissions from the energy sector, power generation using Oxy-fuel combustion has become a promising technology. The issue of trace element emissions during coal combustion, however, has important implication on the operation of Oxy-fuel combustors using different types of coals, as the inclusion of excessive amounts of these elements in the gas is harmful to the health and environment with additional implications for CO_2 transport and storage. Though a number of studies have been carried out to investigate the distribution of trace elements in air combustion, limited data are available on Oxyfuel combustion for different grades of coals. In this study, thermodynamic equilibrium calculations, using FactSage software, were performed to predict the trace elements (Cr, As, Se and Hg) speciation during Oxy-fuel combustion of Victorian brown coal at different temperatures (800-1400 ℃). These predicted trace element emissions from Oxy-fuel combustion were also compared with that from air combustion. It was found that the amount of toxic hexavalent chromium (Cr~(6+)) species, such as CrO_2(OH)_2, in the vapour phase was greater for Oxy-fuel combustion than that for air combustion. This is due to the presence of water vapour in the Oxy-fuel atmosphere. At low temperature the distributions of toxic arsenic and selenium species in Oxy-fuel combustion showed almost the same behaviour as in air combustion. The model also indicates that the mercury emissions were marginally greater for Oxy-fuel combustion than for air combustion. These results are important for the selection of operating conditions to the emitted trace elements within permissible limits.
机译：在减少能源部门的CO_2排放方面，使用含氧燃料燃烧发电已成为一项有前途的技术。但是，煤炭燃烧过程中的微量元素排放问题对使用不同类型煤炭的含氧燃料燃烧器的运行具有重要意义，因为在气体中包含过量的这些元素会对健康和环境造成危害。对CO_2运输和储存的影响。尽管已经进行了许多研究来研究空气燃烧中微量元素的分布，但有关不同等级煤的含氧燃料燃烧的数据有限。在这项研究中，使用FactSage软件进行热力学平衡计算，以预测维多利亚褐煤在不同温度（800-1400℃）下的氧燃料燃烧过程中的痕量元素（Cr，As，Se和Hg）的形态。还将这些预测的含氧燃料燃烧痕量元素排放与空气燃烧的排放进行了比较。研究发现，含氧六价铬（Cr〜（6+））种类，如CrO_2（OH）_2，在含氧燃料燃烧中的含量比在空气燃烧中的含量大。这是由于在含氧燃料气氛中存在水蒸气。在低温下，含氧燃料燃烧中有毒的砷和硒物质的分布与空气燃烧几乎表现出相同的行为。该模型还表明，含氧燃料燃烧的汞排放略高于空气燃烧的汞排放。这些结果对于在允许的范围内选择所发射的痕量元素的工作条件非常重要。

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  • 来源
    《Fuel》 |2013年第12期|135-142|共8页
  • 作者

    Bithi Roy; Wei Lit Choo; Sankar Bhattacharya;

  • 作者单位

    Department of Chemical Engineering, Monash University, PO Box 36, Clayton Campus, Victoria 3800, Australia;

    Department of Chemical Engineering, Monash University, PO Box 36, Clayton Campus, Victoria 3800, Australia;

    Department of Chemical Engineering, Monash University, PO Box 36, Clayton Campus, Victoria 3800, Australia;

  • 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

    Brown coal; Oxy-fuel; Trace elements; Combustion; Themodynamic modeling;

    机译：褐煤;含氧燃料微量元素;燃烧;热力学建模;

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