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Calcium-based sorbents behaviour during sulphation at oxy-fuel fluidised bed combustion conditions

机译：含氧燃料流化床燃烧条件下硫酸化过程中钙基吸附剂的行为

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摘要

Sulphur capture by calcium-based sorbents is a process highly dependent on the temperature and CO_2 concentration. In oxy-fuel combustion in fluidised beds (FB), CO_2 concentration in the flue gas may be enriched up to 95%. Under so high CO_2 concentration, different from that in conventional coal combustion with air, the calcination and sulphation behaviour of the sorbent must be defined to determine the optimum operating temperature in the FB combustors. In this work, the SO_2 retention capacity of two different limestones was tested by thermogravimetric analysis at typical oxy-fuel conditions in FB combustors. The effect of the main operating variables affecting calcination and sulphation reactions, like CO_2 and SO_2 concentrations, temperature, and sorbent particle size, was analysed. It was observed a clear difference in the sulphation conversion reached by the sorbent whether the sulphation takes place under indirect or direct sulphation, being much higher under indirect sulphation. But, in spite of this difference, for a given condition and temperature, the CO_2 concentration did not affect to the sulphation conversion, being its major effect to delay the CaCO_3 decomposition to a higher temperature. For the typical operating conditions and sorbent particle sizes used in oxy-fuel FB combustors, the maximum sorbent sulphation conversions were reached at temperatures of about 900 ℃. At these conditions, limestone sulphation took place in two steps. The first one was controlled by diffusion through porous system of the particles until pore plugging, and the second controlled by the diffusion through product layer. As a consequence, the maximum sulphation conversion increased with decreasing the particle size and increasing the SO_2 concentration.
机译：钙基吸附剂捕获硫的过程高度依赖于温度和CO_2浓度。在流化床（FB）的富氧燃烧中，烟道气中的CO_2浓度可富集至95％。在如此高的CO_2浓度下，不同于常规的煤与空气燃烧，必须确定吸附剂的煅烧和硫酸化行为，以确定FB燃烧器的最佳工作温度。在这项工作中，通过热重分析在FB燃烧器的典型含氧燃料条件下测试了两种不同石灰石的SO_2保留能力。分析了影响煅烧和硫酸化反应的主要操作变量的影响，例如CO_2和SO_2的浓度，温度和吸附剂的粒径。观察到无论是在间接或直接硫酸化下进行硫酸化，吸附剂所达到的硫酸化转化率都有明显的差异，在间接硫酸化下则要高得多。但是，尽管存在这种差异，但在给定的条件和温度下，CO_2的浓度不会影响硫酸盐的转化率，这是其将CaCO_3分解到更高温度的主要作用。对于含氧燃料FB燃烧器的典型操作条件和吸附剂粒度，在约900℃的温度下达到了最大的吸附剂硫酸盐转化率。在这些条件下，石灰石硫酸化分两个步骤进行。第一个通过颗粒的多孔系统扩散直至孔堵塞来控制，第二个通过产物层的扩散来控制。结果，最大的硫酸盐转化率随着粒径的减小和SO_2浓度的增加而增加。

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  • 来源
    《Fuel》 |2011年第10期|p.3100-3108|共9页
  • 作者

    Francisco Garda-Labiano; Aranzazu Rufas; Luis F. de Diego; Margarita de las Obras-Loscertales; Pilar Gayan; Alberto Abad; Juan Adanez;

  • 作者单位

    Dept. Energy and Environment, Instituto de Carboquimica (ICB-CSIC), Miguel Luesma Castan 4, 50018 Zaragoza, Spain;

    Dept. Energy and Environment, Instituto de Carboquimica (ICB-CSIC), Miguel Luesma Castan 4, 50018 Zaragoza, Spain;

    Dept. Energy and Environment, Instituto de Carboquimica (ICB-CSIC), Miguel Luesma Castan 4, 50018 Zaragoza, Spain;

    Dept. Energy and Environment, Instituto de Carboquimica (ICB-CSIC), Miguel Luesma Castan 4, 50018 Zaragoza, Spain;

    Dept. Energy and Environment, Instituto de Carboquimica (ICB-CSIC), Miguel Luesma Castan 4, 50018 Zaragoza, Spain;

    Dept. Energy and Environment, Instituto de Carboquimica (ICB-CSIC), Miguel Luesma Castan 4, 50018 Zaragoza, Spain;

    Dept. Energy and Environment, Instituto de Carboquimica (ICB-CSIC), Miguel Luesma Castan 4, 50018 Zaragoza, Spain;

  • 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

    oxy-fuel combustion; SO_2 retention; sulphation; fluidised beds; calcium-based sorbents;

    机译：氧燃料燃烧;SO_2截留;硫酸化;流化床;钙基吸附剂;

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