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Non-isothermal pore change model predicting CO_2 adsorption onto consolidated activated carbon

机译：非等温孔隙变化模型预测CO_2吸附在固结活性炭上

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摘要

Accurate simulation and detailed description of the dynamics of the adsorption process play a significant role in forecasting the performance of new materials when used in various adsorption systems, like cooling/heating. The activated carbon (AC) consolidation allows improving the heat transfer rate inside the adsorption/desorption bed and compacting the systems. There are numerous mathematical models in literature for gas adsorption onto granular AC. But for consolidated AC, because of the absence of macro-pores, most assumptions that work well for granular AC may lead to significant discrepancies. Therefore, the present research proposes a new mathematical model for gas (CO_2) adsorption onto consolidated adsorbent, a non-isothermal pore change model. The model takes into account the porosity and permeability changes due to the adsorption. The validation of the developed model is performed via comparison with the results obtained experimentally and numerically using an isothermal model. The effective Knud-sen diffusion coefficient for the working pair is evaluated from porosity data. The rate of adsorption or mass transfer coefficient is estimated using the van't Hoff plot. The study results could be applied in the development of waste heat-driven cooling systems employing consolidated composite material as the adsorbent. The proposed mathematical model is also applicable for many other working pairs.
机译：准确的仿真和对吸附过程的动态的详细描述在预测在各种吸附系统中使用时，在预测新材料的性能方面起着重要作用，如冷却/加热。活性炭（AC）固结允许改善吸附/解吸床内的传热速率并压实系统。文献中有许多数学模型，气体吸附到粒状AC上。但对于综合的AC，由于没有宏观孔隙，大多数用于粒状交流的假设可能导致显着的差异。因此，本研究提出了一种新的气体（CO_2）吸附在固结吸附剂上的新数学模型，是一种非等温孔隙变化模型。该模型考虑了由于吸附而导致的孔隙度和渗透性变化。通过比较来执行开发模型的验证，与实验和数值使用等温模型进行实验和数值。从孔隙数据评估工作对的有效Knud-sen扩散系数。使用Van't Hoff Plot估算吸附或传质系数的速率。该研究结果可以应用于使用作为吸附剂的固结复合材料的废热驱动冷却系统的开发。所提出的数学模型也适用于许多其他工作对。

著录项

  • 来源
    《International Journal of Heat and Mass Transfer》 |2021年第10期|121480.1-121480.9|共9页
  • 作者

    Bakytnur Berdenova; Animesh Pal; Bidyut Baran Saha; Aidarkhan Kaltayev;

  • 作者单位

    Faculty of Mechanics and Mathematics Al-Farabi Kazakh National University 71 Al Farabi ave. Almaty 050040 Kazakhstan;

    Department of Nuclear Engineering University of Dhaka Dhaka 1000 Bangladesh;

    International Institute for Carbon-Neutral Energy Research (WPI-12CNER) Kyushu University 744 Motooka Nishi-ku Fukuoka 819-0395 Japan Mechanical Engineering Department Kyushu University 744 Motooka Nishi-ku Fukuoka 819-0395 Japan;

    Faculty of Mechanics and Mathematics Al-Farabi Kazakh National University 71 Al Farabi ave. Almaty 050040 Kazakhstan School of Industrial Engineering Satbayev University 22a Satpaev str. Almaty 050013 Kazakhstan;

  • 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

    Activated carbon; CO_2 adsorption; Consolidated adsorbent; Knudsen diffusion; Non-isothermal model;

    机译：活性炭;CO_2吸附;合并吸附剂;Knudsen扩散;非等温模型;

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