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Influence of High-Temperature Steam on the Reactivity of CaO Sorbent for CO_2 Capture

机译：高温蒸汽对CaO吸收剂吸收CO_2反应性的影响

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摘要

Calcium looping is a high-temperature CO_2 capture technology applicable to the postcombustion capture of CO_2 from power station flue gas, or integrated with fuel conversion in precombustion CO_2 capture schemes. The capture technology uses solid CaO sorbent derived from natural limestone and takes advantage of the reversible reaction between CaO and CO_2 to form CaCO_3: that is, to achieve the separation of CO_2 from flue or fuel gas, and produce a pure stream of CO_2 suitable for geological storage. An important characteristic of the sorbent, affecting the cost-efficiency of this technology, is the decay in reactivity of the sorbent over multiple CO_2 capture-and-release cycles. This work reports on the influence of high-temperature steam, which will be present in flue (about 5-10%) and fuel (~20%) gases, on the reactivity of CaO sorbent derived from four natural limestones. A significant increase in the reactivity of these sorbents was found for 30 cycles in the presence of steam (from 1-20%). Steam influences the sorbent reactivity in two ways. Steam present during calcination promotes sintering that produces a sorbent morphology with most of the pore volume associated with larger pores of ~50 nm in diameter, and which appears to be relatively more stable than the pore structure that evolves when no steam is present. The presence of steam during carbonation reduces the diffusion resistance during carbonation. We observed a synergistic effect, i.e., the highest reactivity was observed when steam was present for both calcination and carbonation.
机译：钙循环是一种高温CO_2捕集技术，适用于燃烧后从电站烟道气中捕集CO_2，或与燃料转化集成到燃烧前的CO_2捕集方案中。捕集技术使用源自天然石灰石的固态CaO吸附剂，并利用CaO和CO_2之间的可逆反应形成CaCO_3：即从烟气或燃料气体中分离出CO_2，并产生适合于地质存储。影响该技术成本效益的吸附剂的一个重要特征是吸附剂在多个CO_2捕集和释放循环中的反应性下降。这项工作报告了烟道气（约占5-10％）和燃料气（约占20％）中存在的高温蒸汽对源自四种天然石灰石的CaO吸附剂反应性的影响。在蒸汽存在下（30％至20％），在30个循环中发现这些吸附剂的反应性显着提高。蒸汽以两种方式影响吸附剂的反应性。煅烧过程中存在的蒸汽促进烧结，从而产生一种吸附剂形态，其大部分孔体积与直径约50 nm的较大孔有关，并且似乎比不存在蒸汽时所形成的孔结构相对更稳定。碳化过程中蒸汽的存在降低了碳化过程中的扩散阻力。我们观察到了协同作用，即，当同时存在用于煅烧和碳酸化的蒸汽时，观察到最高的反应性。

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  • 来源
    《Environmental Science & Technology》 |2012年第2期|p.1262-1269|共8页
  • 作者

    Felix Donat; Nicholas H. Florin; Edward J. Anthony; Paul S. Fennell;

  • 作者单位

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

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

    Department of Chemical Engineering, Imperial College London, South Kensington Campus, London SW7 2AZ, United Kingdom,CanmetENERGY, Natural Resources Canada, 1 Haanel Drive, Ottawa, Canada K1A 1M1;

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

  • 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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