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This paper presents retrofit shortcut models for design of both reboiled and steam-stripped distillation columns.
The shortcut models for different purification units are developed via the insights of the processes.
In particular, shortcut models for retrofit would be valuable for evaluating retrofit design options, for improving the performance of existing distillation systems (columns and heat recovery systems) and can be combined with detailed heat-integration models for optimizing existing heat-integrated distillation systems.
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The optimization framework includes shortcut models developed for the simulation of the existing distillation column, and a retrofit shortcut model for the heat exchanger network.
The shortcut model for pressure swing adsorption (PSA) considering the design conditions (pressure ratio and adsorbent selectivity) is also embedded into the mathematical programming model.
Shortcut models are well established for grassroots design of distillation columns and have been widely applied.
Shortcut models are quicker to solve, do not have significant convergence problems and are more robust than rigorous models for column optimization.
However, no shortcut models are available that address retrofit.
This study makes use of a novel methodology for the synthesis of heat exchanger networks, which is aimed at overcoming the shortcomings associated with the use of shortcut models to represent individual exchangers in the synthesis network.
Rigorous simulations in HYSYS [AEA Technology, Hyprotech Ltd., Calgary, Canada, 2001] have shown good agreement with the shortcut model.
More comprehensive process optimisation is facilitated by shortcut design models and a suitable optimisation framework.
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