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首页> 外文期刊>Environmental Science & Technology >Influence of the Concentration of CO_2 and SO_2 on the Absorption of CO_2 by a Lithium Orthosilicate-Based Absorbent
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Influence of the Concentration of CO_2 and SO_2 on the Absorption of CO_2 by a Lithium Orthosilicate-Based Absorbent

机译：CO_2和SO_2浓度对正硅酸锂基吸收剂吸收CO_2的影响

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摘要

A novel, high temperature solid absorbent based on lithium ortho-silicate (LLtSiCv) has shown promise for postcombustion CO_2 capture. Previous studies utilizing a clean, synthetic flue gas have shown that the absorbent has a high CO_2 capacity, >2S wt %, along with high absorption rates, lower heat of absorption and lower regeneration temperature than other solids such as calcium oxide. The current effort was aimed at evaluating the LLiSiO.* based absorbent in the presence of contaminants found in typical flue gas, specifically SO_2, by cyclic exposure to gas mixtures containing CO_2, H_2O (up to 25 vol. %), and SO_2 (up to 0.95 vol. %). In the absence of SO_2, a stable CO_2 capacity of ~25 wt % over 25 cycles at 550 °C was achieved. The presence of SO_2, even at concentrations as low as 0.002 vol. %, resulted in an irreversible reaction with the absorbent and a decrease in CO_2 capacity. Analysis of S02-exposed samples revealed that the absorbent reacted chemically and irreversibly with SO_2 at 550 °C forming Li,SO_4. Thus, industrial application would require desulfurization of flue gas prior to contacting the absorbent. Reactivity with SO_2 is not unique to the lithium orthosilicate material, so similar steps would be required for other absorbents that chemically react with SO_2.
机译：基于正硅酸锂（LLtSiCv）的新型高温固体吸收剂已显示出燃烧后CO_2捕集的希望。先前利用清洁的合成烟气进行的研究表明，与其他固体（例如氧化钙）相比，吸收剂的CO_2容量高，> 2S wt％，吸收率高，吸收热低，再生温度低。当前的工作旨在通过循环暴露于包含CO_2，H_2O（最高25％（体积））和SO_2（最高25％）的气体混合物中，在典型烟道气中，特别是SO_2中发现污染物的情况下，评估基于LLiSiO。*的吸收剂。至0.95vol。％）。在不存在SO_2的情况下，在550°C的25个循环中达到了约25 wt％的稳定CO_2容量。即使浓度低至0.002 vol。，也存在SO_2。 ％，导致与吸收剂不可逆的反应和CO 2容量的降低。对暴露于SO 2的样品的分析表明，吸收剂在550°C下与SO_2化学不可逆地反应，形成Li，SO_4。因此，工业应用将需要在与吸收剂接触之前将烟道气脱硫。与SO_2的反应性不是原硅酸锂材料独有的，因此，其他与SO_2发生化学反应的吸收剂也需要类似的步骤。

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  • 来源
    《Environmental Science & Technology》 |2011年第16期|p.7083-7088|共6页
  • 作者

    R. Pacciani; J. Torres; P. Solsona; C. Coe; R. Quinn; J. Hufton; T. Golden; L. F. Vega;

  • 作者单位

    Air Products and Chemicals Inc., Allentown, Pennsylvania 18195, United States,MATGAS Research Center, Campus de la UAB, 08193 Bellaterra, Barcelona, Spain;

    Air Products and Chemicals Inc., Allentown, Pennsylvania 18195, United States,MATGAS Research Center, Campus de la UAB, 08193 Bellaterra, Barcelona, Spain;

    Departamento de Fisica, Universitat Autonoma de Barcelona, E-08193 Bellaterra, Spain;

    College of Engineering, Villanova University, 800 Lancaster Avenue Villanova, Pennsylvania 1908S, United States;

    Air Products and Chemicals Inc., Allentown, Pennsylvania 18195, United States;

    Air Products and Chemicals Inc., Allentown, Pennsylvania 18195, United States;

    Air Products and Chemicals Inc., Allentown, Pennsylvania 18195, United States;

    Air Products and Chemicals Inc., Allentown, Pennsylvania 18195, United States,MATGAS Research Center, Campus de la UAB, 08193 Bellaterra, Barcelona, Spain;

  • 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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