Multi-objective optimization of the scheduling of a heat exchanger network under milk fouling

• Published in: Knowledge-based systems Vol. 121; pp. 71 - 82
• Main Authors: Deka, Dimbalita, Datta, Dilip
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.04.2017; Elsevier Science Ltd
• Subjects: Cleaning; Cost engineering; Evolutionary algorithms; Expert systems; Flow velocity; Fouling; Heat exchangers; Heat treatment; Milk; Milk fouling; Milk pasteurization; Multi-objective optimization; Multiple objective analysis; Optimization; Optimization algorithms; Overheating; Pasteurization; Process parameters; Scheduling; Scheduling algorithms; Milk pasteurization; Scheduling; Multi-objective optimization; Evolutionary algorithms; Milk fouling
• ISSN: 0950-7051; 1872-7409
• DOI: 10.1016/j.knosys.2016.12.027

Heat treatment is an essential process in many production systems, which is generally carried out in a heat exchanger network (HEN). The major complication arisen in heat treatment is the fouling due to the deposition of unwanted particles on heat exchanger surfaces. The difficulties, faced in mitigating the fouling by improving the design of heat exchangers or controlling process parameters, necessitate periodic cleaning of the heat exchangers for reinstating their performances. Accordingly, a HEN is desired to schedule in a way to minimize the cleaning cost satisfying various process conditions. In such an attempt, three mixed-binary evolutionary algorithms (EAs) are investigated here for scheduling a HEN engaged in milk pasteurization, in which the growth rate of fouling is comparatively very high. The experimental results depict that the minimum cleaning cost, however, is accompanied with overheating of milk consuming excess energy and a higher outlet temperature of the heating medium (steam) causing excess requirement of steam. Therefore, the scheduling of the HEN is also handled as a multi-objective optimization problem for simultaneously minimizing the cleaning cost, overheating of milk and flow rate of steam, in which the EAs could maintain a better balance among the three conflicting objectives.