Optimization models for diesel production : an industrial aplication / Modelos de otimização na produção de oleo diesel : uma aplicação industrial

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

This work has been developed integrating two traditional concepts of operational research and chemical engineering, respectively: supply chain optimization and global process optimization. The focus of the study is the PETROBRAS Paulínia Refinery, REPLAN, which integrates the downstream petroleum and derivatives complex of Brazil. There are two production trains in the Refinery; they both have atmospheric and vacuum distillation, fluid catalytic cracking, delayed coker, and diesel hydrotreating units, whereof each process unit is a complete chemical plant. Around 170 tanks, 3.2 million m3, 48 final products and 12000 lineups are some figures that highlight the off-site local complex, for transfer, blending and storage of crude, chemicals, intermediate and final products. The production decisions at REPLAN are the local level of a corporate countrywide decision hierachy. The local level is again divided into sublevels, traditionally: month planning, daily scheduling, operation detailing and production control. This work proposes a change in the production decision hierarchy of REPLAN, adding a level between scheduling and operation detailing, with the purpose of providing an optimization tool for the production of two specifications of diesel oil along a few days horizon. Crucial step for global optimization, the system mathematical model is described in details. This includes the lineups possibilities and physical constraints, volume and property balances, property behavior through the hidrotreating units and the competition for swing-cuts and intermediate streams. It was developed new empirical blending models to predict two of the diesel properties: distillation curve and cetane number. The whole set of equations was implemented using MS Excel and GAMS, and solved with CONOPT algorithm. An increase in the average diesel production and a reduction in the diesel inventory, measured from February to October 2007, compared to 2006, are related to the daily use of the software

ASSUNTO(S)

hierarquias optimation ptroleum refinery diesel fuels metodos de produção production method petroleo - refinarias otimização combustiveis diesel

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