Development and Product Transition Operation of Multi-Tasking Silane Reactive Distillation Process
| Autor: | Yu-Hung Chien, 簡鈺鴻 |
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| Rok vydání: | 2019 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 107 Under the consideration of economy and environment, the multi-tasking process which combines the function of multiple units will be the main direction of chemical process development. It not only reduces the space and the investment costs, but also decide the production plan by market demand. Operating the product transition without shut-down can decrease the waste of raw material. The silane multi-tasking reactive distillation process is optimized by simulated annealing method. Signal selector is used in the control structure for the multi-tasking reactive distillation process because each case has unique temperature sensitive stages. According to the analysis of degrees of freedom, the manipulated variables are the tower top pressure controller and two temperature controllers for the product transition. It takes a long time and might make the process toward another steady-state as the nominal values of the target product are switched simultaneously. When the set point of the target product is switched simultaneously, the transition time might be reduced. Compared with the first delay overshoot strategy, the best results show that the switching time is reduced by 2.8 hours, the total off-specification product is reduced by 18.05%, and the condenser duty and reboiler duty are saved by 4.16% and 4.2%, respectively. Sometimes, due to the interactions among each controller, the process responses would have oscillation behavior. To avoid the interaction between the controllers, some controllers should be switched to manual mode and adjusting the operating variables directly. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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