title: On extensions of approaches for heat recovery calculations in integrated chemical process systems
abstract: This paper deals with heat recovery calculations in integrated chemical process systems. A level of heat recovery in a heat exchanger network (HEN) determines the cost of heat energy consumed in a total system and influences environmental pollution. Even though well established approaches to the problem of calculating minimum cost of utilities in a HEN are available at present, they do not fully account for complex industrial scenarios. The aim of methods developed in this work is to extend applications for the following cases: 1. multiple utilities of great temperature spans (so called non-point utilities), and 2. disturbances of flow-rates of heat exchanging streams. To solve the problems, methods have been developed based on optimisation models. The models are linear though one of them involves mixed-integer variables. Linearity ensures the possibility of solving the models to global optimum, even for large-scale industrial problems. The description of solution methods and examples of applications are presented in this paper.
authors.affiliation: Rzeszow University of Technology, Department of Chemical Engineering and Process Control, Poland. ichjj@prz.rzeszow.pl
authors.initials: JM
authors.lastname: Jezowski
authors.initials: HK
authors.lastname: Shethna
authors.initials: RJ
authors.lastname: Bochenek
authors.initials: FJ
authors.lastname: Castillo