Optimization And Control Analysis For The System Of Acetone-Ethanol-Water Based On Dividing-wall Column

In recent society,the study on energy conservation of process intensification and process integration becomes more and more popular with the growing awareness of people in chemical engineering. Distillation is the classical high energy-consumption process, and it makes the optimization of distillation system difficult for its character of multi-input-multi-output and interaction between the parameters. While the dividing-wall column(DWC) is the advanced and high performance separation equipment, it is hard to get better control strategy.The DWC is used to take place of acetone column and ethanol column in the later process of acetone-ethanol-butanol fermented liquor in this article. The new process of DWC is created and this process is also optimized in energy conversation and studied in control system.The original data in this process is as follows. The numer of actual plates convert into theoretical plates of acetone column and ethanol column is 75 and 70, respectively; the feed composition of mass fraction for ethanol, acetone and water is 21.8%, 75% and 3.2%, respectively. The process simulation software is used to simulate the original process, and creat the new process of DWC based on the result of the simulation. The response surface methodology(RSM) is used to optimize the new process. Choosing the optimal liquid split ratio and vapor split ratio, and the numbers of theoretical plates of T1, T2, T3 and T4 and the feed stage of T1 are set to the parametric variables, and the mathematics model between the column base duty and the parametric variables is regressed. The DWC can reach the goal of 52.21 % of energy conversation compared with the original process.The toal annual cost(TAC) is calculated and compared in the original and DWC process, and the rating and selection for equipments are also performed. After being compared, the energy saving in cold and hot utility are 40.29% and 52.21%, respectively. The saving in TAC is 39.43%Dynamic simulation is performed in the DWC process, and the more suitable control strategy is created. According to the result of feed flow and composition disturbance, this control strategy can make the ternary system be recovered, and the comprehensive performance is well.