Modeling and simulation of crude oil atmospheric tower using Peng-Robinson property package and relaxation algorithm

  • Mahbod Mahdvar, Department of Chemical Engineering,Iran University of Science and Technology, Iran
  • Mansor Shirvani, Department of Chemical Engineering,Iran University of Science and Technology, Iran

    • The objective of this paper is to develop and validate a general, effective and robust software to simulate the crude oil atmospheric tower and to predict the properties of products of tower. The first step in modeling of atmospheric tower is the characterization of crude oil and cutting the crude assay to the identified pseudocomponents. In this way numerous experimental relations such as Twu, Cavett, Lee-Kesler was employed to verify the properties of pseudocomponents (eg. Tc, Pc, MW, w) and the property package of Peng-Robinson was used to calculate the phase equilibria relations of vapor and liquid phases. At the next the relaxation mathematical solution algorithm was used to solve the MESH equations. The results was compared with the experimental data from some refinery plants and HYSYS software.This results are as follow:
    - The Mean Relative Error(MRE) for all data between the experimental and predicted data is 5.3%.
    - The Mean Relative Error(MRE) for all data between the experimental and HYSYS result is 9.7%.
    The results show the acceptable error between the presented software and experimental data and higher accuracy of this work in camparison to results of HYSYS software.

    Keywords: Modeling-Simulation-Crude oil-Atmospheric tower-Characterization-Relaxation