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Dynamic simulation, optimization and analysis of control stratefies of the vacuum tower of the distillation unit of petroleum refinery process

Author(s):
Júlio Pereira Maia
Total Authors: 1
Document type: Doctoral Thesis
Institution: Universidade Estadual de Campinas (UNICAMP). Faculdade de Engenharia Química
Defense date:
Examining board members:
Jefferson Ferreira Pinto; Eduardo Coselli Vasco de Toledo; César Benedito Batistella; Vera Lúcia Reis de Gouveia
Advisor: Rubens Maciel Filho
Abstract

A petroleum vacuum distillation unit study on control scheme strategies is developed in this work. Real plant data and information is gathered from a Brazilian Refinery to develop a representative simulation of the process, which had achieved a maximum 5% overall difference from the plant results. The simulation was set to be highly detailed, including pressure drop calculations, pumping system and the use of commercial column internals (packing and plates) in it. A parametric analysis was carried in order to verify the most influent variables in the process, with respect to temperature profiles, product flows and product qualities. The resultant steady state simulation was then converted into dynamic regime, when a control scheme equivalent to the real plant control scheme was implemented. This control scheme was then subjected to a set of common perturbations that occur in the real process, producing the dynamic response of the process to each perturbation applied. By analyzing the dynamics of these responses and the open loop responses, an alternative control scheme is proposed and verified in the same manner the later one was. A specific control loop was proposed to account a petroleum product quality index, such as ASTM D86 95% recovery. The comparison of the control schemes by means of the dynamic responses considering the correlated ISE (integral squared error) of each scheme has shown an average error reduction of 70% in the main products quality. (AU)

FAPESP's process: 09/09046-8 - Dynamic simulation, optimization and analysis of control strategies of the vacuum tower of the Destillation unit of petroleum refinery process
Grantee:Júlio Pereira Maia
Support type: Scholarships in Brazil - Doctorate