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Influence of calcination conditions on carrying capacity of CaO-based sorbent in CO_2 looping cycles

机译：煅烧条件对CO_2循环中CaO基吸附剂承载能力的影响

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摘要

This study examines the loss of sorbent activity caused by sintering under realistic CO_2 capture cycle conditions. The samples tested here included two limestones: Havelock limestone from Canada (New Brunswick) and a Polish (Upper Silesia) limestone (Katowice). Samples were prepared both in a thermo-gravimetric analyzer (TGA) and a tube furnace (TF). Two calcination conditions were employed: in N_2 at lower temperature; and in CO_2 at high temperature. The samples obtained were observed with a scanning electron microscope (SEM) and surface compositions of the resulting materials were analyzed by the energy dispersive X-ray (EDX) method. The quantitative influence of calcination conditions was examined by nitrogen adsorption/desorption tests, gas displacement pycnometry and powder displacement pycnometry; BET surface areas, BJH pore volume distributions, skeletal densities and envelope densities were determined. The SEM images showed noticeably larger CaO sub-grains were produced by calcination in CO_2 during numerous cycles than those seen with calcination in nitrogen. The EDX elemental analyses showed a strong influence of impurities on local melting at the sorbent particle surface, which became more pronounced at higher temperature. Results of BET/BJH testing clearly support these findings on the effect of calcination/cycling conditions on sorbent morphology. Envelope density measurements showed that particles displayed densification upon cycling and that particles calcined under CO_2 showed greater densification than those calcined under N_2. Interestingly, the Katowice limestone calcined/cycled at higher temperature in CO_2 showed an increase of activity for cycles involving calcination under N_2 in the TGA. These results clearly demonstrate that, in future development of CaO-based CO_2 looping cycle technology, more attention should be paid to loss of sorbent activity caused by realistic calcination conditions and the presence of impurities originating from fuel ash and/or limestone.
机译：这项研究检查了在实际的CO_2捕获循环条件下烧结引起的吸附剂活性的损失。此处测试的样品包括两种石灰石：加拿大的哈弗洛克石灰石（新不伦瑞克省）和波兰的石灰石（西里西亚上）石灰石（卡托维兹）。在热重分析仪（TGA）和管式炉（TF）中都准备了样品。使用两种煅烧条件：在较低温度的N_2中；并在高温的CO_2中用扫描电子显微镜（SEM）观察获得的样品，并通过能量色散X射线（EDX）方法分析所得材料的表面组成。煅烧条件的定量影响通过氮吸附/解吸试验，气体置换比重瓶和粉末置换比重瓶进行检验。确定了BET表面积，BJH孔体积分布，骨骼密度和包膜密度。 SEM图像显示在许多循环中在CO_2中煅烧产生的CaO亚晶粒比在氮气中煅烧产生的CaO亚晶粒明显更大。 EDX元素分析表明，杂质对吸附剂颗粒表面的局部熔化有很大影响，在更高温度下，这种熔化变得更加明显。 BET / BJH测试结果清楚地支持了这些发现，涉及煅烧/循环条件对吸附剂形态的影响。包封密度测量表明，颗粒在循环时显示出致密化，并且在CO 2下煅烧的颗粒比在N_2下煅烧的颗粒具有更大的致密化。有趣的是，在较高温度下在CO_2中煅烧/循环的Katowice石灰石显示出TGA中涉及N_2下煅烧的循环的活性增加。这些结果清楚地表明，在基于CaO的CO_2循环技术的未来发展中，应更加注意由实际的煅烧条件和源自燃料灰分和/或石灰石的杂质引起的吸附剂活性的损失。

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  • 来源
    《Fuel》 |2009年第10期|1893-1900|共8页
  • 作者

    Vasilije Manovic; Jean-Pierre Charland; John Blarney; Paul S. Fennell; Dennis Y. Lu; Edward J. Anthony;

  • 作者单位

    Canmet ENERGY, Natural Resources Canada, I Haanel Drive, Ottawa, Ontario, Canada K1A 1M1;

    Canmet ENERGY, Natural Resources Canada, I Haanel Drive, Ottawa, Ontario, Canada K1A 1M1;

    Department of Chemical Engineering, Imperial College, London SW7 2AZ, United Kingdom;

    Department of Chemical Engineering, Imperial College, London SW7 2AZ, United Kingdom;

    Canmet ENERGY, Natural Resources Canada, I Haanel Drive, Ottawa, Ontario, Canada K1A 1M1;

    Canmet ENERGY, Natural Resources Canada, I Haanel Drive, Ottawa, Ontario, Canada K1A 1M1;

  • 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

    CO_2 capture; CaO looping cycle; sintering; densification;

    机译：二氧化碳捕获;CaO循环周期;烧结;致密化;

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