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Numerical simulation of a three-bed PSA cycle for the methaneitrogen separation with silicalite

机译：硅质岩分离甲烷/氮的三床PSA循环的数值模拟

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摘要

In this work, a three-bed PSA cycle for recovering methane from methaneitrogen mixtures using silicalite is analysed by numerical simulation, including two equalization steps and a rinse step. The model employed is derived from conservation equations, considering assumptions widely accepted for these systems. The experimental adsorption isotherms of methane and nitrogen required for the PSA model have been measured up to 10 bar, and the mass transfer coefficients of these gases on silicalite have also been estimated from experimental data. According to the simulated results, it is possible to recover methane with pipeline quality in one stage with high recovery (87-96%) from mixtures with nitrogen content as high as 50%. This process has the potential of significantly increasing the adsorbent productivity with respect to the reported values for the same separation by PSA, and the theoretical power consumption is lower than the one reported using membrane technology.
机译：在这项工作中，通过数值模拟分析了一个三床PSA循环，该循环利用PS沸石从甲烷/氮气混合物中回收甲烷，包括两个均衡步骤和一个冲洗步骤。考虑到这些系统广泛接受的假设，所采用的模型是从守恒方程导出的。 PSA模型所需的甲烷和氮气的实验吸附等温线已测量到最高10 bar，并且这些气体在硅质岩上的传质系数也已根据实验数据进行了估算。根据模拟结果，可以从含氮量高达50％的混合物中以高回收率（87-96％）的一级回收具有管道质量的甲烷。与通过PSA进行的相同分离所报告的值相比，该方法具有显着提高吸附剂生产率的潜力，并且理论功耗低于使用膜技术报告的功耗。

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