INVESTIGADORES
DIAZ Maria Soledad
artículos
Título:
Dynamic optimization of an intensive energetically integrated large-scale process
Autor/es:
MARIELA RODRIGUEZ; JUAN I. LAIGLECIA; PATRICIA HOCH; MARIA SOLEDAD DIAZ
Revista:
COMPUTER AIDED CHEMICAL ENGINEERING
Editorial:
ELSEVIER
Referencias:
Lugar: Amsterdam; Año: 2010 vol. 28 p. 469 - 474
ISSN:
1570-7946
Resumen:
In this work we propose a first principles dynamic optimization model for an intensive energetically integrated process, a natural gas processing plant, within a simultaneous dynamic optimization framework. We have developed rigorous models, including thermodynamics with a cubic equation of state, for separation tanks, distillation columns, turboexpanders and cryogenic countercurrent heat exchangers with partial condensation. The resulting partial differential algebraic equation system is transformed into an ordinary differential algebraic equation one (DAE) by applying the method of Lines for the spatial coordinate. The high integration between process units as well as path constraints have been efficiently handled by a simultaneous dynamic optimization approach in which the DAE is transformed into a large nonlinear programming problem through orthogonal collocation over finite elements in time and solved with an interior point algorithm. In the case study, we maximize ethane recovery under a ramp change in natural gas feed flowrate. The model provides temporal and spatial profiles of controlled and manipulated variables that are in good agreement with plant data.