| Petroleum systems are complex systems composed of innumerable chemical components, including crude oil and gasoline, diesel and other petroleum products. Petroleum processing units feature large scale and high energy consumption, and their optimization usually means huge economic benefits. In describing the separation and transportation processes of petroleum and its products, models of vapor-liquid equilibrium are the the necessary foundation. Taking simplified vapor-liquid equilibrium models as the subject, this paper is of practical value.Based on a systematic review of previous work, three innovations were made in this thesis:(1) A procedure is established for charactering petroleum systems, which starting from the ASTM distillation data and overall density of a target oil, produces the representing pseudo-components and their characteristic constants.(2) Using the two-parameter Antoine equation for the vapor pressure of pseudo-components, a simplified model of vapor-liquid equilibrium for petroleum systems was constructes under the assumptions of ideal gass and ideal liquid. From This model is simple and rapid and performs well in comparison with the complex thermodynamic model based on SRK equation of state at low operating pressures.(3) Through steady state simulation of a FCC main fractionator, the usefulness and effectiveness of the simplified vapor-liquid equilibrium model were verified. |
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