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CO_2 capture from PCC power plants using solid sorbents: Bench scale study on synthetic gas

机译：使用固体吸附剂从PCC电厂捕获CO_2：合成气的基准规模研究

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摘要

Much attention is currently paid to the global warming effect due to CO_2 emissions. Physical adsorption of CO_2 using regenerable sorbents is a promising approach for CO_2 capture from flue gases. The objective of this work was to study the potential for CO_2 capture of different sorbents, at a representative scale and under realistic conditions resembling those of flue gases after the desulphurisation tower of conventional pulverized coal combustion (PCC) plants. Firstly, comparative adsorption-desorption studies for CO_2/N_2 mixtures were performed for different sorbents: one alumina-based, one zeolitic-type and one activated carbon. The zeolitic type sorbent was identified as most promising and was subjected to a subsequent in-depth study of its stability, tolerance to poisoning and durability over cycles. Short term tests were performed to assess the effect of competitive adsorption e.g. H_2O, and deactivation due to SO_2 and NOx. Long term tests were conducted to study the effect of the number of adsorption-desorption cycles. CO_2 adsorption breakthrough curves (exit CO_2 concentration about 1%) of the fresh zeolitic material under different gas compositions were obtained. The addition of water had a detrimental effect on CO_2 adsorption, shifting CO_2 breakthrough curve to shorter times, probably due to competitive adsorption of H_2O. The simultaneous presence of H_2O and SO_2 has a synergistic negative effect on CO_2 adsorption. However, when H_2O, SO_2 and NO coexist in the testing gas, the synergistic negative effect on CO_2 adsorption is slightly attenuated. The adsorbent was also studied on consecutive adsorption-desorption cycles under the different gas compositions. In all cases, there was a certain loss in CO_2 adsorption capacity on passing from the first to the second cycle, being almost constant in successive cycles.
机译：当前，由于CO_2的排放，引起了全球变暖效应的关注。使用可再生吸附剂对CO_2进行物理吸附是一种从烟气中捕获CO_2的有前途的方法。这项工作的目的是研究具有代表性的规模和在类似于常规粉煤燃烧（PCC）装置脱硫塔后的烟道气的现实条件下，以不同的吸附剂捕获CO_2的潜力。首先，针对不同吸附剂对一种CO_2 / N_2混合物进行了比较吸附-解吸研究：一种氧化铝基，一种沸石型和一种活性炭。沸石型吸附剂被认为是最有前途的，并且随后对其稳定性，对中毒的耐受性和经久耐用性进行了深入研究。进行短期测试以评估竞争性吸附的效果，例如H_2O，以及由于SO_2和NOx引起的失活。进行了长期测试以研究吸附-解吸循环次数的影响。获得了不同气体组成下新鲜沸石材料的CO_2吸附突破曲线（出口CO_2浓度约为1％）。加水对CO_2的吸附有不利影响，可能是由于H_2O的竞争性吸附，使CO_2突破曲线缩短了时间。 H_2O和SO_2的同时存在对CO_2的吸附具有协同负作用。但是，当测试气体中同时存在H_2O，SO_2和NO时，对CO_2吸附的协同负效应会有所减弱。还研究了在不同气体成分下连续吸附-解吸循环的吸附剂。在所有情况下，从第一个循环到第二个循环的过程中，CO_2吸附能力都有一定的损失，在连续的循环中几乎保持恒定。

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  • 来源
    《Fuel》 |2013年第12期|143-152|共10页
  • 作者

    Esperanza Ruiz; Jose M. Sanchez; Marta Marono; Juan Otero;

  • 作者单位

    Centro de Investigaciones Energtticas, Medioambientales y Tecnoldgicas (CIEMAT), Avda Complutense 40, 28040 Madrid, Spain;

    Centro de Investigaciones Energtticas, Medioambientales y Tecnoldgicas (CIEMAT), Avda Complutense 40, 28040 Madrid, Spain;

    Centro de Investigaciones Energtticas, Medioambientales y Tecnoldgicas (CIEMAT), Avda Complutense 40, 28040 Madrid, Spain;

    Centro de Investigaciones Energtticas, Medioambientales y Tecnoldgicas (CIEMAT), Avda Complutense 40, 28040 Madrid, 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

    CO_2 capture; CO_2 adsorption; Combustion;

    机译：二氧化碳捕获;CO_2吸附;燃烧;

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