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首页> 外文期刊>Energy & fuels >Multiphase Analysis for High-Pressure Adsorption of CO_2/Water Mixtures on Wet Coals
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Multiphase Analysis for High-Pressure Adsorption of CO_2/Water Mixtures on Wet Coals

机译：湿煤上高压吸附CO_2 /水混合物的多相分析

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摘要

Traditional modeling of gas adsorption on wet coals does not consider water as a separate adsorbed component and treats the adsorbed water as a "pacifier" of the coal matrix. In a recent work, we presented a new modeling approach for investigating the competitive adsorption of gas/water mixtures in high-pressure systems. We used the simplified local-density (SIX)) model to investigate the effect of including the competitive adsorption of water present in coals on gas adsorption under the conditions encountered in coalbed methane (CBM) and CO_2 sequestration applications. In continuation of that work, we present here a new multiphase algorithm to investigate the three-phase adsorption equilibrium of CO_2/water mixtures on wet coals. When water is treated as one of the adsorbed components in a high-pressure gas adsorption system, as many as three fluid phases may coexist at equilibrium (gas, adsorbed, and liquid phases). A new algorithm is presented in this work to facilitate a Gibbs energy-driven multiphase analysis of the system. The algorithm employs a phase-insertion technique, which involves formally inserting a water-rich, bulk liquid phase and solving a three-phase flash problem, wherein the three phases are the adsorbed, bulk gas, and liquid phases. At equilibrium, the Gibbs energy of the system is calculated based on the phase distribution obtained at each step. This calculation is repeated sequentially with incrementally increased amounts of the inserted third phase. A minimum in the Gibbs energy at the given temperature and pressure, subject to material balance constraints, provides the equilibrium phase distribution in these systems. Multiphase analysis was performed for high-pressure CO_2/water mixture adsorption on four wet coals utilizing this algorithm. Analysis indicates that a water-rich liquid phase is present in coals that contain large amounts of inherent moisture. For these coals, the water-rich phase appeared at the higher pressures in the isotherm and the fraction of this phase increased with bulk pressure, reaching a maximum near the CO_2 critical pressure. In contrast, the low-moisture coals did not appear to contain a third-phase at equilibrium.
机译：对湿煤进行气体吸附的传统模型并未将水视为单独的吸附成分，而是将吸附的水视为煤基质的“安抚剂”。在最近的工作中，我们提出了一种新的建模方法，用于研究高压系统中气体/水混合物的竞争性吸附。我们使用简化的局部密度（SIX）模型来研究在煤层气（CBM）和CO_2固存应用中遇到的条件下，包括竞争性吸附煤中存在的水对气体吸附的影响。为了继续进行这项工作，我们在这里提出了一种新的多相算法，以研究湿煤上CO_2 /水混合物的三相吸附平衡。当水被视为高压气体吸附系统中的一种吸附组分时，在平衡状态下最多可以共存三个液相（气相，吸附相和液相）。在这项工作中提出了一种新算法，以促进系统的Gibbs能量驱动的多相分析。该算法采用了相位插入技术，该技术涉及正式插入富水的本体液相并解决三相闪蒸问题，其中三相是吸附相，本体气相和液相。在平衡状态下，系统的吉布斯能量是根据每个步骤获得的相位分布来计算的。依次重复此计算，并增加插入的第三相的数量。在给定的温度和压力下，吉布斯能量的最小值受材料平衡约束的影响，在这些系统中提供了平衡相分布。利用该算法对4种湿煤上的高压CO_2 /水混合物吸附进行了多相分析。分析表明，含有大量固有水分的煤中存在富水液相。对于这些煤，富水相出现在等温线较高的压力下，并且该相的分数随体积压力而增加，在CO_2临界压力附近达到最大值。相反，低水分煤在平衡时似乎不包含第三相。

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  • 来源
    《Energy & fuels》 |2012年第mayajuna期|p.3470-3480|共11页
  • 作者

    Sayeed A. Mohammad; Khaled A. M. Gasem;

  • 作者单位

    School of Chemical Engineering, Oklahoma State University, Stillwater, Oklahoma 74078, United States;

    School of Chemical Engineering, Oklahoma State University, Stillwater, Oklahoma 74078, United States;

  • 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);
  • 原文格式 PDF
  • 正文语种 eng
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