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首页> 外文期刊>Separation and Purification Technology >Dynamic simulation of multicomponent gas separation by hollow-fiber membrane module: Nonideal mixing flows in permeate and residue sides using the tanks-in-series model
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Dynamic simulation of multicomponent gas separation by hollow-fiber membrane module: Nonideal mixing flows in permeate and residue sides using the tanks-in-series model

机译：中空纤维膜组件进行多组分气体分离的动态模拟：使用串联罐模型在渗透液和残渣侧进行非理想混合流

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摘要

A new simulation model for the dynamic performance of gas separation membrane modules is presented. In order to take account of nonideal mixing flows in permeate and residue sides a tanks-in-series model is utilized. As a stable computational scheme, the relaxation method is applied to solve the governing ordinary differential equations for transport across the membrane, mass balance and pressure distributions in a hollow-fiber membrane module. The proposed simulation model and scheme are validated using the experimental data and simulation results hydrogen gas separation and air separation in the literature. Using the proposed simulation model and scheme the dynamic performance of membrane gas separation processes, hydrogen recovery process and two-stage methane separation process with residue recycle, is examined by varying the operating conditions, i.e., the bulk mixing degree (perfect mixing, plug flow and intermediate mixing), pressure drop and recycle ratio. The computational results indicate that effect of mixing degree in the feed side is more significant as compared with that in the permeate side and less mixing in the feed side results in higher performance. The retentate recycle is found to improve methane recovery efficiency. The proposed simulation model considering nonideal mixing in the membrane module provides more reliable examination of unsteady-state behaviors of hollow-fiber membrane gas separation modules.
机译：提出了一种新型的气体分离膜组件动态性能仿真模型。为了考虑渗透液和残渣侧的非理想混合流，采用了串联罐模式。作为一种稳定的计算方案，使用松弛方法来求解控制中的微分方程，以解决跨膜传输，质量平衡和中空纤维膜组件中的压力分布问题。利用实验数据和仿真结果对提出的仿真模型和方案进行了验证，文献中对氢气和空气进行了分离。使用提出的模拟模型和方案，通过改变操作条件，即整体混合度（完全混合，活塞流），检查了膜式气体分离过程，氢气回收过程和带有残余物再循环的两阶段甲烷分离过程的动态性能。和中间混合），压降和循环比。计算结果表明，与渗透侧相比，进料侧混合度的影响更为显着，而进料侧较少的混合导致更高的性能。发现渗余物再循环提高了甲烷的回收效率。所提出的考虑膜组件中非理想混合的模拟模型为中空纤维膜气体分离组件的非稳态行为提供了更可靠的检验。

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