臺灣博碩士論文加值系統

一般生產工廠的製程都包含了迴流結構，Wu和Yu(2002)曾探討具有迴流結構的兩成份簡化製程，利用穩態擾動靈敏度分析及均衡關係的概念，有效地利用均衡控制架構取代組成控制環路，可以讓迴流的效應對於產物流量的影響減到最小。
考量實際的生產製程多會有不純物的存在，而Wu和Yu(2002)僅探討了兩成份的簡化系統，使其所提的均衡控制架構受到侷限。本研究將討論除了兩成份的物質外也包含了不純物的程序，由基本製程操作觀念可知，在具有不純物存在下必定會有雪球效應的影響；為了解決不純物在製程中的累積，研究中將利用排放閥的架設，並延用兩成份簡化製程的控制架構的修改做均衡關係的應用。在排放閥的流量控制部分，將分別利用迴流流線中的組成環路串級排放閥的流量的方式，或用均衡關係的流量比做排放閥的流量控制方式。由探討比較其操控結果可知，所設計的均衡控制架構確可有效操控含有不純物及迴流的簡化製程。

In general, industrial processes usually include recycle loops for the production stream. In 2002, Wu and Yu considered the binary composition system in the simplified process with recycle. By use of steady-state disturbance sensitivity analyses and material balance concepts, the balanced control scheme can effectively eliminate some of the composition control loops. The balanced scheme can also overcome the snowball effect for plants with recycle.
In this work, the design problem of balanced control structures for simplified process with inert and recycles is studied. The snowball effect is unavoidable in this case. The concepts of balanced scheme can be applied to set the control loops of purge flowrate. In this study, the composition loop in recycle stream is first used to cascade the purge flowrate loop. On the other hand, the flowrate ratio control scheme from balanced relationship can also be applied to manipulate the purge flowrate. Simulation results demonstrate the effective performance of the proposed balanced control structures for simplified process with inert and recycles.

摘要 Ⅰ
Abstract Ⅱ
目錄 Ⅲ
附圖目錄 Ⅴ
附表目錄 Ⅶ
第一章 序論 1
1.1 前言 1
1.2 文獻回顧 1
1.3 研究動機 4
1.4 組織章節 5
第二章 迴流系統的特性探討 6
2.1 前言 6
2.2 物質的迴流 6
2.3 能量的整合 8
2.4 迴流效應的影響 10
2.4.1 迴流系統的時間參數影響 11
2.4.2 雪球效應影響 16
第三章 具有迴流系統的簡化製程操控結果探討(Wu和Yu,2002) 24
3.1 前言 24
3.2 具有迴流系統的簡化製程介紹 24
3.3 兩成份簡化製程的控制架構 27
3.4 均衡架構的應用原理 29
3.4.1 針對反應器液位的控制分析 32
3.4.2 不需控制反應器液位的架構(binary-A) 32
3.4.3 用p控制來維持反應器液位的架構(binary-B) 35
3.5 兩成份簡化製程的操控結果 38
第四章 有不純物存在的簡化製程操控結果探討 45
4.1 前言 45
4.2 兩成份含有不純物的製程操控分析 45
4.2.1 含有purge的控制概念 46
4.2.2 製程的經濟效應探討 47
4.2.3 含有不純物的簡化製程穩態條件選擇 49
4.3 含不純物的簡化製程控制架構設計 51
4.3.1 迴流組成串級purge流量控制的架構探討 51
4.3.2 均衡關係控制purge流量的架構探討 52
4.4 含不純物的簡化製程控制結果分析比較 55
第五章 結論與未來方向 73
參考文獻 74

Belanger, P. W., and W. L. Luyben, “Design of Low-Frequency Compensators for Improvement of Plantwide Regulatory Performance,” Ind. Eng. Chem. Res., 36, 5339-5347, 1997.

Buckley, P. S.,W. L. Luyben, and J. P. Shunta, “Design of Distillation Column Control Systems,” Instrument Society of America, Research Triangle Park, NC, 1985.

Denn, M. M. and R. Lavie, “Dynamics of Plants with Recycle,” Chem. Eng. J., 24, 55-59, 1982.

Douglas, J. M. and D. L. Terrill, “Heat-Exchanger Network Analysis. 1. Optimization,” Ind. Eng. Chem. Res., 26, 685-691, 1987.

Ernest, J. H and J. D. Seade, “Equilibrium-Stage Separation Operations in Chemical Engineering,” Wiley, New York, 1981.

Gilliland, E. R., L. A. Gould, and T. J. Boyle, “Dynamic Effects of Material Recycle,” Proceedings of Joint Automatic Control Conference, 140-146, 1964.

Georgakis, C., “On the Use of Extensive Variable in Process Dynamics and Control,” Chem. Engng. and Science, 41, 1471-1484, 1986.

Lee, W. and V. W. Weekman, “Advanced Control Practice in the Chemical Process Industry,” AIChE J., 22, 27-38, 1976.

Luyben, W. L., “Practical Distillation Control,” Van Nostrand Reinhold, New York, 1992.

Luyben, W. L., “Dynamics and Control of Recycle System 1. Simple Open-Loop and Close-Loop Systems,” Ind. Eng. Chem. Res., 32, 466-475, 1993a.

Luyben, W. L., “Dynamics and Control of Recycle System 2. Comparison of Alternative Process Design,” Ind. Eng. Chem. Res., 32, 476-486, 1993b.

Luyben, W. L., “Dynamics and Control of Recycle System 3. Alternative Processes Design in a Ternary System,” Ind. Eng. Chem. Res., 32, 1142-1153, 1993c.
Luyben, W. L., “Snowball Effects in Reactor/Separator Processes with Recycle,” Ind. Eng. Chem. Res., 33, 299-305, 1994.

Luyben, M. L. and C. A. Floudas, “Analyzing the Interaction of Design and Control - 2. Reactor Separator-Recycle System,” Computers Chem. Engng., 18, 971-994, 1994.

Luyben, W. L., D. T. Bjorn, and M. L. Luyben, “Plantwide Process Control,” Mcgraw-Hill , New York, 1999.

McAvoy, T. J. and N. Ye, “Base Control for the Tennessee Eastman Problem,” Computers Chem. Engng., 18, 383-413, 1994.

Perlmutter, D. D., “Stability of Chemical Reactors,” Wiley, New York, 1965.

Price, R. M., P. R. Lyman, and C. Georgakis, “Throughput Manipulation in Plantwide Control Structure,” Ind. Eng. Chem. Res., 33, 1197-1207, 1994.

Shinskey, F. G.., “Distillation Control,” 2nd ed., McGraw-Hill, New York, 1984.

Wu, K. L., and C. C. Yu, “Reactor/Separator Processes with Recycle - 1. Candidate Control Structure for Disturbance Rejection,” Computers Chem. Engng., 20, 1291-1316, 1996.

Wu, K. L., C. C. Yu, W. L. Luyben, and S. Skogestad, “Reactor/Separator Processes with Recycles - 2. Design for Composition Control,” Computers Chem. Engng., 27, 401-421, 2002.

高志杰，“以田納西伊士曼程序發展整廠均衡的控制結構”，國立台灣工業技術學院化學工程技術研究所碩士論文，台北，台灣，1995。

張隆宗，“田納西伊士曼示範程序全廠控制系統設計”，國立台灣工業技術學院化學工程技術研究所碩士論文，台北，台灣，1995。