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首页> 外文期刊>International Journal of Coal Preparation and Utilization >Impact of Bed Length on Low-Concentration Coal Mine Methane Enrichment by Proportion Pressure Swing Adsorption
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Impact of Bed Length on Low-Concentration Coal Mine Methane Enrichment by Proportion Pressure Swing Adsorption

机译：床长对比例变压吸附对低浓度煤矿瓦斯富集的影响

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The enrichment and utilization of low-concentration coal bed methane (LCCMM) will provide a fuel source, will ensure safely from flammable gas release caul will prevent significant greenhouse gas emissions. One of the special challenges in dealing with LCCMM originates from the presence. of O_2 which is difficult to process economically and explodes easily. In this work, we studied oxygen-bearing LCCMM with a CH_4 concentration of 20% and developed a safe and effective enrichment method for LCCMM: Proportion Pressure Swing Adsorption (PPSA), which used a mixture of active carbon (AC) and carbon molecular sieves (CMS) as adsorbents. With this method, CH_4 and O_2 in LCCMM can be adsorbed simultaneously because CH_4 is mostly adsorbed by active carbon and O_2 is mostly adsorbed by the CMS. Therefore, the concentration of CH_4 and O_2 is well controlled and does not exceed the explosive limit during the adsorption and desorplion processes. The impact of bed length on LCCMM by PPSA was investigated. We have demonstrated the safely and feasibility of PPSA for obtaining 30% CH_4 from LCCMM, with 20% CH_4 in abas a feed stock. Our results showed that the O_2 concentration can be controlled well and does not exceed the explosive limit in both adsorption and desorplion, and the CH_4concentration in the desorption gas can be increased to more than 30% by adjusting the bed length and mass ratio of the AC and CMS.
机译：低浓度煤层气（LCCMM）的富集和利用将提供燃料来源，确保安全地释放可燃气体，避免大量温室气体排放。处理LCCMM的特殊挑战之一来自存在。 O_2很难经济地处理并且容易爆炸。在这项工作中，我们研究了CH_4浓度为20％的含氧LCCMM，并开发了一种安全有效的LCCMM富集方法：比例变压吸附（PPSA），它使用了活性炭（AC）和碳分子筛的混合物（CMS）作为吸附剂。用这种方法，由于CC_4主要被活性炭吸附，而O_2主要被CMS吸附，因此LCCMM中的CH_4和O_2可以同时被吸附。因此，CH_4和O_2的浓度得到了很好的控制，在吸附和解离子过程中未超过爆炸极限。研究了床长对PPSA对LCCMM的影响。我们已经证明了PPSA从LCCMM获得30％CH_4以及原料中含20％CH_4的安全性和可行性。我们的结果表明，可以很好地控制O_2的浓度，并且不超过吸附和解吸子的爆炸极限，并且通过调节AC的床长和质量比，可以将解吸气体中的CH_4浓度提高到30％以上。和CMS。

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