水合法回收炼厂气中氢气的模型研究

Model Calculation of Recovery of H_2 From Refinery Gas by Hydration Method

开发了一种含水合物相的闪蒸模型,该模型可以应用于水合法回收炼厂气中氢气过程的模拟计算。其中,气相的逸度计算采用PR状态方程,TBAB电解质溶液逸度的计算采用MPT状态方程,水合物相逸度的计算采用Chen-Guo模型。采用正割迭代法进行含水合物相的气-液-水合物三相闪蒸计算,此算法计算简单。通过模拟计算,考察了TBAB浓度、气液比、压力、以及温度对分离效果和关键组分回收率的影响,从而为工业生产选择操作条件提供依据。

In this work, a model was developed to simulate the process for recovery of H2 from refinery gas by absorption-hydration method. The Peng Robinson equation of state was chosen to describe the fugacity of gas phase. The modified Patel-Teja model was used for describing the fugacity of TBAB in aqueous solution. The Chen-Guo hydrate model was extended to calculate the fugacity of TBAB in semi-clathrate hydrate phase. A mathematical approach based on the secant iteration was successfully applied to solve flash calculation. The effect of TBAB concentration of solution, gas liquid ratio, temperature and pressure on separation performance was systematically investigated from the perspective of thermodynamics and mass balance.