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Adsorption modeling of coalbed gases and the effects of water on their adsorption behavior.

机译：煤层气的吸附模型以及水对其吸附行为的影响。

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The simplified local-density/Peng-Robinson (SLD-PR) adsorption model was utilized to investigate the adsorption behavior of coalbed gases on coals of varying rank. The model parameters were generalized in terms of readily-accessible coal properties such as the ultimate and proximate analyses of the coals. Further, the effects of water present in coals on the gas adsorption behavior were studied. In particular, the SLD-PR model was used to investigate this effect wherein water was treated as a separate adsorbed component in a binary mixture. To conduct this study, new high-pressure gas adsorption measurements were acquired for CO2 on wet Argonne coals and for methane, nitrogen and CO2 on dry and wet activated carbon using a volumetric technique.;The generalized SLD-PR model was found to be capable of accurate predictions of the adsorption of coalbed gases and their mixtures on dry and wet coals. Specifically, the generalized model was capable of (a) predicting the pure-gas isotherms for methane, nitrogen and CO2 on coals within two times the expected experimental uncertainties and (b) predicting, a priori , the adsorption of mixtures formed by these gases within three times the expected experimental uncertainties, on average. The generalized model was validated with an external data set which comprised of CO2 adsorption isotherms on 27 diverse coals.;CO2-water binary mixed gas adsorption modeling results on wet coals indicated that the SLD-PR model is capable of representing the adsorption of this highly asymmetric mixture within the experimental uncertainties, on average. The model parameterization used and the molecular interactions accounted for in describing water adsorption behavior on coals illustrated a viable method to obtain precise representations of this adsorbed mixture. The phase-check analysis of the same mixture indicated that there is a potential for the formation of an aqueous phase in these systems for coals that contain large amounts of moisture, with the exception of Beulah Zap lignite coal.
机译：利用简化的局部密度/ Peng-Robinson（SLD-PR）吸附模型研究了煤层气在不同等级煤上的吸附行为。根据容易获得的煤炭属性（例如，煤炭的最终分析和最近分析）对模型参数进行了概括。此外，研究了煤中水对气体吸附行为的影响。特别地，使用SLD-PR模型研究这种效果，其中将水作为二元混合物中的单独吸附成分处理。为了进行这项研究，使用体积技术获得了新的高压气体吸附测量值，用于湿Argonne煤上的CO2以及干，湿活性炭上的甲烷，氮气和CO2。对干煤和湿煤吸附煤层气及其混合物的准确预测。具体而言，广义模型能够（a）在预期的实验不确定性的两倍之内，预测煤上甲烷，氮和CO2的纯气等温线，以及（b）先验地预测这些气体形成的混合物在内部的吸附平均预期实验不确定性的三倍。该通用模型通过外部数据集进行了验证，该数据集包括对27种不同煤的CO2吸附等温线。；在湿煤上的CO2-水二元混合气体吸附模型结果表明，SLD-PR模型能够代表这种高度吸附。在实验不确定性范围内的平均不对称混合物。描述煤对水的吸附行为时所用的模型参数化和考虑到的分子相互作用说明了一种获得该吸附混合物精确表示的可行方法。对相同混合物的相检查分析表明，对于含有大量水分的煤，这些系统中可能会形成水相，但Beulah Zap褐煤除外。

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