Multi-objective modeling and optimization for scheduling of cracking furnace systems

Cracking furnace is the core device for ethylene production. In practice, multiple ethylene furnaces are usually run in parallel. The scheduling of the entire cracking furnace system has great significance when multiple feeds are simultaneously processed in multiple cracking furnaces with the changi...

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Bibliographic Details
Published in:Chinese journal of chemical engineering Vol. 25; no. 8; pp. 992 - 999
Main Authors: Jiang, Peng, Du, Wenli
Format: Journal Article
Language:English
Published: Elsevier B.V 01.08.2017
Subjects:
Cracking furnace systems
Feed scheduling
Genetic algorithm
Multi-objective mixed integer nonlinear optimization
Cracking furnace systems
Genetic algorithm
Feed scheduling
Multi-objective mixed integer nonlinear optimization
ISSN:1004-9541, 2210-321X
Online Access:Get full text
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Summary:Cracking furnace is the core device for ethylene production. In practice, multiple ethylene furnaces are usually run in parallel. The scheduling of the entire cracking furnace system has great significance when multiple feeds are simultaneously processed in multiple cracking furnaces with the changing of operating cost and yield of product. In this paper, given the requirements of both profit and energy saving in actual production process, a multi-objective optimization model contains two objectives, maximizing the average benefits and minimizing the average coking amount was proposed. The model can be abstracted as a multi-objective mixed integer nonlinear programming problem. Considering the mixed integer decision variables of this multi-objective problem, an improved hybrid encoding non-dominated sorting genetic algorithm with mixed discrete variables (MDNSGA-II) is used to solve the Pareto optimal front of this model, the algorithm adopted crossover and mutation strategy with multi-operators, which overcomes the deficiency that normal genetic algorithm cannot handle the optimization problem with mixed variables. Finally, using an ethylene plant with multiple cracking furnaces as an example to illustrate the effectiveness of the scheduling results by comparing the optimization results of multi-objective and single objective model.
ISSN:1004-9541
2210-321X
DOI:10.1016/j.cjche.2017.03.040