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Unformatted text preview: When compared with commonly-used industrial software, the LP model in GAMS is able to test a variety of operating variables to find a gross refinery margin value near the global optimum. Industrial software operates on a successive linear programming principle, which depends on the starting point of the solver. This can lead to industrial software finding only a local optimum. Compared to the model without utilities, the LP utility model gives a larger gross refinery margin. While the model takes utility cost into account, it is still able to optimize the use of each unit in the refinery, increasing the total throughput for each time period evaluated. Using the basic linear Bangchak Refinery model in GAMS, it was shown that the results of a successive linear programming (SLP) method depend on the starting point selected. Different initial conditions resulted in different stream output values....
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- Spring '10
- Chemical Engineering