臺灣博碩士論文加值系統

由Afifin and Chien (2007)可知,異丙醇去水程序中預先蒸餾塔和回收塔的回流比相當小,因此使用氣提塔取代一般蒸餾塔,發展出一個新的純化程序.經由分析,此程序有更高能源節省和更節省設備成本.
進一步對此程序架構程序控制,藉由單板溫度控制來控制塔底組成和比例控制有機回流量,經由增減20%進料量與組成改變量的閉環控制測試,有很好的控制結果.

Because the reflux ratio used either in the pre-concentration column or the recovery column of the three-column heterogeneous distillation sequence for IPA dehydration system is quite small demonstrated by Arifin and Chien (2007), these two conventional distillation columns are both replaced by a stripping column in this study and a new separation scheme called Scheme 3 is thereby developed. The economic analysis of the proposed system shows it is more energy efficient and lower capital costs as compared to the two and three-column sequences afore-mentioned.
Further, in developing a plant-wide control structure, a tray temperature control loop is implemented in each of the three columns which regulates reboiler duty in order to maintain the bottom product compositions for Scheme 3, and ratio control of the organic reflux flow to the feed flow rate of the azeotropic column is used to reject feed rate disturbance. Closed-loop responses to ±20% changes in fresh feed rate and feed H2O composition show that the proposed strategy has good control performance. This proposed scheme can be achieved three goals that are more energy saving, less total annual cost, and process easily controlled.

Abstract
誌謝
Table of contents
List of tables
List of figures
Chapter 1 Introduction
1.1 Background
1.2 Motivation of this work
Chapter 2 Steady-State Design of IPA Dehydration Process
2.1 Property and thermodynamic model
2.2 Conceptual steady-state design
2.3 Economic analysis
Chapter 3 Dynamic Simulation
3.1 MESH equation
3.2 Physical properties
3.3 Equilibrium-related computation algorithms
3.4 Modularized simulation
3.5 Controllers
Chapter 4 Control Strategy
4.1 Basic control strategy
4.2 Result and discussion
Chapter 5 Conclusions
Nomenclature
Reference

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