油气吸附分离常用的数值模拟方法

Numerical Simulation Methods Commonly Used in Oil Vapor Adsorption and Separation

油气吸附理论是利用活性炭、硅胶、沸石等吸附剂吸附回收油品蒸气的理论基础,可用来减少油品损耗、保护环境。油气吸附理论研究的不断深入,以及基于不同理论模型、适用于不同体系的油气吸附理论不断被提出,拓展了油气吸附的实际应用领域,本文分析了Langmuir、BET、吸附势及溶液吸附等4类常用的油气吸附模型,并指出了4种模型各自的适用范围和优缺点。对于单一气体或者理想的单分子层的气体,可以用Langmuir吸附模型;对于多分子层气体,可以使用扩展的Langmuir吸附模型或者BET吸附模型;吸附气体在临界温度以下时,用Grant-Manes吸附模型比较准确;"空穴"溶液模型(VSM)适用于共沸混合气体;随着计算机软件和硬件的发展,特别是一些大型商用软件和大型计算机工作站的出现,使得油气吸附模型可方便地进行离散化数值处理。

Oil adsorbents such products and is sorption theories cal models and vapor adsorption theories are the theoretical basis of the methods for recovering oil vapor with as active carbon,silica gel and zeolite.Recovering oil vapor can help reduce the loss of oil instrumental to environmental protection.With the deepening of the research into oil vapor adas well as with the advent of new oil vapor adsorption theories based on different theoretisuitable for different systems,the area of application of oil vapor adsorption technology hasexpended.This article describes four types of commonly used oil vapor adsorption models,namely Langmuir, BET,adsorption potential and solution adsorption ,including their respective areas of application and advantages and disadvantages.For single type of gas or ideal unimolecular-layer gases,a Langmuir adsorption model can be used;for muhimolecular-layer gases,an extended Langmuir adsorption model or a BET adsorption model can be used;for gases below the critical temperature,a Grant-Manes adsorption model is more accurate;thevacancy solution model （VSM） is suitable for azeotropic blended gases;with the development of computer software and hardware ,especially the advent of large commercial software and computer stations ,oil vapor adsorption models can be readily used in discretization numerical processing.