Enhanced turndown process for a bitumen froth treatment operation
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United States of America Patent
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Mar 7, 2017
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app pub date -
Apr 19, 2012
filing date -
May 4, 2011
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Abstract
More particularly, the model was a dynamic simulation built in HYSYS™ v7.1. The component slate was simplified and selected to give a vapor and two liquid phases, and have the ability to measure an S/B ratio. All the unit operations were included and modeled as best fit within HYSYS™. Pumps were all modelled as standard HYSYS™ centrifugal pumps with performance curves, settlers were modelled as vertical 3-phase vessels with internal weir enabled—the overflow side of the weir is used to simulate the overflow vessels on the settlers. All proposed controllers were included with generic tuning parameters, which control the system process variable (PV) to match a set point (SP). The control algorithm incorporated master PV controllers such as S/B ratio to relate froth and solvent flows and maintain relative material balance relationship between the process streams involved. In this specific simulation, the solvent flows were assigned a slave relationship relative to the bitumen flow; that is, the solvent controller SP was reset based on the bitumen froth flow and the master S/B ratio.
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