On extensions of approaches for heat recovery calculations in integrated chemical process systems
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.
Jezowski
JM
Rzeszow University of Technology, Department of Chemical Engineering and Process Control, Poland. ichjj@prz.rzeszow.pl
Shethna
HK
Bochenek
RJ
Castillo
FJ