Dynamic Simulation and Control of Vapor Recompression Column

Vapor recompression column is a type of energy integrated distillation columns that has a good potential for applying in industrial plants. In this paper the dynamic simulation and control of a vapor recompression column by using Aspen-Hysys 2009 was investigated. For this purpose a control structure with five control loops; two levels, one pressure and two compositions; was selected. The results of dynamic simulation showed that low interaction exists between the composition control loops and the selected control structure can work properly in case of changing in composition set-points and feed disturbances. In addition, the results showed that the energy saving by using this method would be about 75.8% in comparison with conventional column.