Fan C., Cui Z., Zhang H., Tian W., 2020, Pressure Swing Thermal-Dividing Wall Integrated Light Hydrocarbon Distillation Design and its Control, Chemical Engineering Transactions, 81, 295-300.
Light hydrocarbon separation has received much attention due to its high energy consumption. In this paper, a novel five-column pressure swing thermal-dividing wall (PSTDW) integrated light hydrocarbon separation process is designed to replace the conventional six-column scheme and its control structure is proposed to effectively intensify the integrated distillation process. First, dividing wall column (DWC) as an energy-saving technology is introduced in the distillation process, which can save energy by 13.49 MW. Second, the heat duty between ethylene column and propylene column in the process is matched by means of thermal integration to further improve thermal integration efficiency, with energy saved by 33.7 %. Finally, one control strategy of the PSTDW process is designed to guarantee the product purity qualification. Its dynamic simulation results show that the control structure can effectively make the process back to a steady state in the face of disturbance.
