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在各种气体膜分离模型中,平均推动力模型以其计算简单、易于在商业流程模拟软中使用等优点,普遍应用于气体膜分离过程的工艺设计中。但随着膜分离技术的发展,膜的渗透率增大,分离过程中压力范围变广,需要重新判定平均推动力模型的准确性及适用范围。以计算比较准确的离散模型为标准,对比离散模型、对数平均推动力模型和算术平均推动力模型的计算方程,确定压降为影响平均推动力模型准确性的主要参数。分别用离散模型和平均推动力模型对H_2/N_2、CO_2/N_2、O_2/N_2 3种具有代表性的体系进行模拟计算。并分析在不同膜渗透率、操作压力、浓度条件下2种平均推动力模型准确性。结果表明,算术平均推动力模型在低压降体系中的准确性较好,对数平均推动力模型适用于高压降体系。
Among the various gas membrane separation models, the average driving force model is widely used in the process design of the gas membrane separation process due to its simple calculation and easy application in commercial process simulation soft ware. However, with the development of membrane separation technology, membrane permeability increases, the pressure range in the separation process becomes wider, and the accuracy and scope of the average driving force model need to be re-determined. Comparing the discrete model with the more accurate model, the comparison between discrete model, logarithmic averaged driving force model and arithmetic averaged driving force model is made. The pressure drop is the main parameter that affects the accuracy of the average driving force model. The representative systems of H 2 / N 2, CO 2 / N 2 and O 2 / N 2 were simulated by using discrete model and average propulsion model. The accuracy of two kinds of average driving force models under different membrane permeability, operating pressure and concentration was analyzed. The results show that the accuracy of the arithmetic average propulsion model is better in the low pressure drop system and the logarithmic average propulsion model is suitable for the high pressure drop system.