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首页> 外文期刊>Environmental Science & Technology >Determination of Dew Point Conditions for CO_2 with Impurities Using Microfluidics
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Determination of Dew Point Conditions for CO_2 with Impurities Using Microfluidics

机译：使用微流控技术测定含杂质的CO_2的露点条件

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摘要

Impurities can greatly modify the phase behavior of carbon dioxide (CO_2), with significant implications on the safety and cost of transport in pipelines. In this paper we demonstrate a microfluidic approach to measure the dew point of such mixtures, specifically the point at which water in supercritical CO_2 mixtures condenses to a liquid state. The method enables direct visualization of dew formation (～ 1-2 μm diameter droplets) at industrially relevant concentrations, pressures, and temperatures. Dew point measurements for the well-studied case of pure CO_2-water agreed well with previous theoretical and experimental data over the range of pressure (up to 13.17 MPa), temperature (up to 50 ℃), and water content (down to 0.00229 mol fraction) studied. The microfluidic approach showed a nearly 3-fold reduction in error as compared to previous methods. When applied to a mixture with nitrogen (2.5%) and oxygen (5.8%) impurities-typical of flue gas from natural gas oxy-fuel combustion processes-the measured dew point pressure increased on average 17.55 ± 5.4%, indicating a more stringent minimum pressure for pipeline transport. In addition to increased precision, the microfluidic method offers a direct measurement of dew formation, requires very small volumes (～10 μL), and is applicable to ultralow water contents (＜0.005 mol fractions), circumventing the limits of previous methods.
机译：杂质会大大改变二氧化碳（CO_2）的相态，对管道的安全性和运输成本产生重大影响。在本文中，我们展示了一种微流体方法来测量此类混合物的露点，特别是超临界CO_2混合物中的水凝结成液态的点。该方法可以在工业上相关的浓度，压力和温度下直接观察露水的形成（直径约为1-2μm的液滴）。经过充分研究的纯CO_2-水情况的露点测量与以前的理论和实验数据非常吻合，在压力（最高13.17 MPa），温度（最高50℃）和水含量（最低0.00229 mol）的范围内分数）研究。与以前的方法相比，微流体方法的误差降低了近3倍。当将其与氮（2.5％）和氧（5.8％）杂质混合使用时（来自典型的天然气含氧燃料燃烧过程的烟道气），测得的露点压力平均增加了17.55±5.4％，这表明最低要求更为严格管道运输压力。除了提高精度外，微流体方法还可以直接测量露水的形成，需要非常小的体积（〜10μL），并且适用于超低水含量（＜0.005 mol分数），从而避免了先前方法的局限性。

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  • 来源
    《Environmental Science & Technology》 |2014年第6期|3567-3574|共8页
  • 作者

    Wen Song; Hossein Fadaei; David Sinton;

  • 作者单位

    Mechanical and Industrial Engineering and Institute for Sustainable Energy, University of Toronto, 5 King's College Road, Toronto, Ontario M5S 3G8, Canada;

    Mechanical and Industrial Engineering and Institute for Sustainable Energy, University of Toronto, 5 King's College Road, Toronto, Ontario M5S 3G8, Canada;

    Mechanical and Industrial Engineering and Institute for Sustainable Energy, University of Toronto, 5 King's College Road, Toronto, Ontario M5S 3G8, Canada;

  • 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);
  • 原文格式 PDF
  • 正文语种 eng
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