A rigorous disjunctive optimization model for simultaneous flowsheet optimization and heat integration

Large scale optimization of a sour water stripping plant using surrogate models

“…The model proposed by Grossmann et al (1998) is reformulated as a large MINLP problem, but it can be reduced to an MILP problem when dealing only with isothermal streams, thus guaranteeing the global optimum solution.…”

“…This is equivalent to introduce discontinuities and non-differentiabilities in the model. To overcome this difficulty, as far as we know, there are two alternatives; the first is the "pinch location method", proposed by Duran and Grossmann (1986) and reformulated as a disjunctive problem by Grossmann et al (1998). The second is an implicit enumeration approach proposed by Navarro-Amorós et al (2013).…”

“…The second is an implicit enumeration approach proposed by Navarro-Amorós et al (2013). Both approaches have similar numerical performance, however, the disjunctive version of the pinch location method (Grossmann et al, 1998) generates smaller size models, so in this paper we follow this approach. An overview of the pinch location method in its disjunctive formulation has been included in Appendix A.…”

“…In this paper, we used the superstructure approach presented by Yee and Grossmann (1990). Appendix A shows the equations of the "Pinch Location Method" in a GDP form, which was reformulated as an MINLP model (Grossmann et al, 1998). Fig.…”

“…Difficulties that are experienced with the Duran and Grossmann (1986) model were overcome with the disjunctive model proposed by Grossmann et al (1998), who avoided non-differentiabilities and approximations.…”