INVESTIGADORES
CORSANO Gabriela
congresos y reuniones científicas
Título:
Process Integration: Multiple Single Product vs. Multiproduct Plants
Autor/es:
GABRIELA CORSANO; JORGE M. MONTAGNA; OSCAR A. IRIBARREN; PIO A. AGUIRRE
Lugar:
Rio de Janeiro
Reunión:
Congreso; ENPROMER 2005; 2005
Institución organizadora:
UFRJ
Resumen:
Process synthesis and design of batch plants must consider scheduling strategies simultaneously,
to obtain a feasible design. In this paper NLP models are presented for getting the optimal design and
operation of a batch plant where products follow different production routes sharing some but not all of the
stages. The structure of the plant is decided: the alternative of multiple single product plants is compared with
a multiproduct plant. Also for some batch stages, a superstructure is considered in order to obtain the best
number of units and their configuration. A separate plant provides material and energy resources for these
processes, with the residuals of one becoming raw material for others. The objective function employed is the
maximization of the total profit given by the earnings of selling products and savings due to unused
resources, minus the total annualized investment and operation costs.
The multiproduct plant is designed by first solving a relaxed model, with the objective of finding the optimal
campaign sequence and ratio between the number of batches of each product. Next a NLP model is solved to
obtain the optimal feasible design, implementing a novel representation of the scheduling constraints. This
representation arises from the zero-wait policy adopted, but is not the classical multiproduct plants flow shop
formulation.
In order to assess the multiproduct plant design, a single product multiplant complex was designed for the
optimal production targets obtained with the multiproduct model. The design and operation cost for this
complex is 22% larger than the one obtained with the multiproduct scheme. Optimal design and operation
variables, plant structure and recycle streams for both schemes, and the comparison of both strategies are
reported.