内部热耦合空分塔的建模与操作分析

Modeling and Operation Behavior of Internal Thermal Coupling Air Separation Column

建立了内部热耦合空分精馏塔(ITCASC)的数学模型,采用高斯-牛顿法迭代求解,选用液相组成作为迭代变量,氧、氮、氩三元物系的物性计算采用PR状态方程。仿真结果表明,在保证分离效果不下降的条件下,ITCASC高压塔的塔压可以从传统空分塔的680 kPa降低到500 kPa,能耗降低约26.47%;操作分析为以后的理论研究和实际应用提供了定性和定量分析。该模型可以用于进一步的流程设计、优化和控制。

A numeric model of internal thermal coupling air separation column（ITCASC） is established.Gauss-Newton＇s method is used to solve the model,when liquid phase compositions are taken as variables.Physical properties of O2,N2,Ar are computed from Peng-Robinson state equation.The simulation results show that the pressure of ITCASC can be reduced to 500 kPa from traditional air separation column pressure 680 kPa,i.e.about 26.47 % energy is saved.A series of operation behavior analyses are carried out to provide qualitative and quantitative analysis for further research and practice application.The model can be used for further design,optimization and control.