- 學位論文
2-戊烯複分解反應蒸餾塔之控制策略研究
Study of Control Strategies for 2-pentene Metathesis Reactive Distillation Column
摘要
反應蒸餾技術是將化工程序中的反應及分離結合在同一操作單元，使得系統具備反應器與蒸餾塔之功能，可簡化生產程序，提高生產效率，降低能源需求，對改善化工產業製程有很大的幫助。近年來有不少文獻提到將2-戊烯複分解反應應用於反應蒸餾塔之上，本研究嘗試將文獻中所提到之單環路塔底溫度控制系統加入塔頂溫度控制器來操作回流比，並與使用塔頂溫控操作回流量之雙環路溫度控制系統進行比較，探討於各種不同擾動下，何種控制策略能有較好的表現。 本研究所使用的模擬程式是利用Microsoft Visual Basic.NET程式語言做為開發的工具，其建構在質量平衡、能量平衡及相平衡上，並包含數個副程式模組，可幫助計算並模擬各種穩態及動態應答之結果。 由模擬結果可知，針對進料量增加的擾動，以回流量做為塔頂控制器操作變數的控制架構能有較好的表現及較短的安定時間；而在進料量減少及進料組成比例改變的擾動下，操作回流比的控制架構則有較好的控制效果、較短的安定時間及較小的產品濃度偏差量。
並列摘要
Reactive distillation is the process of simultaneous reaction and separation in a single unit. This technology is suitable to improve the chemical processes due to the following advantages: simplifying the process; increasing production efficiency; reducing energy consumption. In recent years, it was reported that 2-pentene metathesis reaction could use the reactive distillation column approach. In this work, we try to add a top temperature controller in the single temperature loop control system, using it to manipulate reflux ratio, and also taking this control structure to compare with the control system which uses a top temperature controller to manipulate reflux flowrate. The aim of this research is to study which control strategies should have a better performance in the different disturbance. In this simulation program, Microsoft Visual Basic.NET was used as a developing tool and we start to develop program with solving the mass balance, energy balance and phase equilibrium equations and then construct them to be a series of subroutine models. According to the results, manipulating reflux flowrate would provide good control performance for the increasing feed flowrate disturbance. Manipulating reflux ratio is better in terms of settling time and steady-state deviation of concentration for the decreasing feed flowrate disturbance and the feed composition disturbance.