Development Of Phase Equilibrium Calculation Module Based On CAPE-OPEN

With the continuous development of computer technology,computer technology was widely used in the fields of chemical engineering and oil refining and chemical simulation software has emerged.After years of development,chemical simulation software has become the major design tools to simulate and optimize chemical processesfor the design institutes and research institutes.Different software has its own advantages,but the compatibility and interoperability between the software is poor.To better play the advantages of various simulation software,the EU proposed the CAPE-OPEN standard in the late 1990 s.The CAPE-OPEN standard regulated the interface of each component and become the recognized interface standard of chemical simulation software.At present,the world-famous chemical simulation software such as Aspen Plus,ProII,etc.followed and supported the CAPE-OPEN standard.The development of a universal simulation software that supports the CAPE-OPEN standard has become the current trend of chemical simulation software.The principle of phase equilibrium is the theoretical basis for chemical separation operations based on phase change,such as distillation,absorption and extraction.Phase equilibrium calculation is the basis of chemical process simulation and design calculation.Among them,the vapor-liquid equilibrium is the most typical character and the key to solve the chemical engineering problems.Therefore,based on the method for calculating the vapor-liquid phase equilibrium,developing a vapor-liquid phase equilibrium calculation module that supports the CAPE-OPEN standard has a great significance in the chemical process.In this paper,the phase equilibrium calculation method is studied.Under the Windows 7 operating system,a vapor-liquid phase equilibrium calculation module is developedin Visual Studio 2005 development environmentusing the Visual C++ programming language and basing on the CAPE-OPEN standard.The phase equilibrium calculation method is divided into the model method and themodelless method.The model methodintroducedthe vapor-liquid equilibrium calculation,and theno-model methodintroduced the direct method and the indirect method.Firstly,based on the vapor-liquid equilibrium calculation,a dew point model and a flash model including temperature and pressure flash,temperature vaporization fraction flash,pressure vaporization fraction flash,temperature flash,pressure flashtemperature entropy flash,and pressure entropy flash were established.Secondly,a GUI for the vapor-liquid phase equilibrium calculation module was developed.Users can input the module parameters and view the calculation results directly from the interface.Finally,the developed modules can be successfully loaded and called in chemical software that supports the CAPE-OPEN standard.The actual industrial process example was chosen to verify the developed vapor-liquid equilibrium calculation module.The results showed that the vapor-liquid equilibrium calculation result is accurate and can be used for the simulation calculation of actual industrial processes.The research and development of the vapor-liquid phase equilibrium calculation module based on the CAPE-OPEN standard has a strong foundation value and practical value.Based on this research,the CAPE-OPEN standard can be further studied,new phase equilibrium calculation methods can be added,and the model solution algorithm can be optimized and improved.