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Superstructure Optimization of Petroleum Refinery Design: Processing Alternatives for Naphtha Produced from the Atmospheric Distillation Unit

Yeoh, Xiao Qi (2009) Superstructure Optimization of Petroleum Refinery Design: Processing Alternatives for Naphtha Produced from the Atmospheric Distillation Unit. Universiti Teknologi PETRONAS. (Unpublished)

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Abstract

This research project concerns superstructure optimization for the design of petroleum refineries focusing on the subsystem that considers the alternatives for naphtha produced from the atmospheric distillation unit (ADU). The intricate complexities associated with this process synthesis problem in general and the refinery design problem in specific necessitates the development and implementation of a systematic and automated approach that efficiently and rigorously integrate the elaborate interactions involving the design decision variables. The primary objective of this research is to establish a systematic procedure to determine the optimal topology of the refinery subsystem of naphtha produced from the ADUusing the optimization or mathematical programming approach. Through the identification of equipment, raw materials, products, and process alternatives in terms of the different feasible choices of states (material streams) and tasks (process units) for the mentioned subsystem, the first step is to represent the problem as the interconnections between these elements in a network representation of a superstructure. Subsequently, an optimization model is formulated with binary and continuous variables in order to arrive at the optimum flowsheet design. The scope of this work is focused on the formulation of a mixed-integer linear programming (MILP) and a generalized disjunctive programming (GDP) optimization models. The independent design decision variables are flows of materials and the continuous variables of stream flowrates with the discrete variables denoting the existence of streams. Logical constraints are extensively incorporated in the models to represent qualitative design knowledge through design specifications and structural specifications on the interconnectivity relationships involving the states and the tasks. Computational studies to demonstrate the implementation of the proposed modeling approaches are carried out on the GAMS modeling language platform using the established GAMS/CPLEX solver and the new code of GAMS/LOGMIP solver for the MILP and GDP, respectively. Two design scenarios are considered as distinguished by the API gravity (specific gravity) of the crude charge to the ADU. The optimal refinery topology generated from the MILP and GDP model agree with the typical existing refinery topology. The way forward for this project is to account for varying sulphur content in the crude charge as well as to introduce nonlinearity in the composition modeling to obtain a more practical representation of a real-world refinery design problem.

Item Type: Final Year Project
Academic Subject : Academic Department - Chemical Engineering - Separation Process
Subject: T Technology > TP Chemical technology
Divisions: Engineering > Chemical
Depositing User: Users 2053 not found.
Date Deposited: 22 Oct 2013 09:44
Last Modified: 22 Oct 2013 09:44
URI: http://utpedia.utp.edu.my/id/eprint/9154

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