電腦模擬最適化程序設計

東帝士集團擬籌建一座年產80萬噸對二甲苯的芳香烴廠，該廠設計是目前全世界單線產能最大者。由於其超大的產能，使此芳香烴廠的設計頗異於傳統，例如其二甲苯分離單元就必須使用二座並聯操作的二甲苯分餾塔方得以負荷。為了能提昇此芳香烴廠的操作效率與生產彈性，且同時節省日後製程修改的龐大費用，吾人等在設計階段即應用電腦製程模擬以進行最適化分析與設計。本文即以此新設計的二甲苯分離單元為探討對象，除以電腦製程模擬來檢視其操作的可行性外，並以增加此二座二甲苯分餾塔串聯操作的彈性為例，來說明如何藉由電腦製程模擬以達成最佳的設計。本文藉最適化分析以尋求此二座二甲苯分餾塔串聯時的最佳操作狀況，並決定各進料物流的進料位置與流量、各產物物流的出料位置與流量、各蒸餾塔的負荷與所需修改的設備。經模擬分析後顯示，若此二座二甲苯分餾塔切換至串聯操作，則可提昇鄰二甲苯約67％與對二甲苯約3％的產量。當鄰二甲苯市場需求高時，該操作切換的彈性可以有效增加此芳香烴廠的收益。本文亦針對增加此二座二甲苯分餾塔串聯操作彈性所需再增加的投資費用進行經濟分析，以評估其效益。

關鍵字

二甲苯分離；模擬；最適化設計；經濟評估

並列摘要

In process industry, simulation is a commonly used tool to optimize process design during the initial stage of a grassroot plant project. We can use simulation to investigate the future plant operability, producibility, production flexibility, and future expansion capability, etc. It is particularly important to conduct the simulation study before the design is finalized. It can result in a significant capital expenditure saving or huge economic benefit return. In this paper, we present a case study to illustrate using simulation to optimize the xylene fractionation unit design in an aromatics plant. Tuntex Oil Company plans to , build an aromatics plant to produce 800,000 MTA of para-xylene. According to the process licensor, two distillation columns, which are operated in parallel, are required to make xylene separation for downstream units. Since these two columns are extreme large and complicated, we used simulation to evaluate their design: feed tray and side-draw. Off location, liquid and vapor loading, etc. In addition, an alternate case with two columns running in series was studied. We discovered that even with the same equipment as the original design, two columns, which run in series, could increase ortho-xylene production about 67% and 3% of para-xylene. Simulation methodology and economic analysis are also discussed in this paper.

並列關鍵字

Xylene fractionation ； Simulation ； Optimal design ； Economic evaluation.

國際替代計量

電腦模擬最適化程序設計

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