蒸餾為化學工業中廣泛使用之分離程序，但其高能源需求亦使其成為製程減碳與電氣化的重要研究對象。熱泵輔助蒸餾（HPAD）可回收塔頂低溫熱能，進而降低外部公用流體之需求。然而，其整體效益受到熱泵架構、熱整合策略與操作條件影響本研究以丙烯／丙烷分離系統為案例，利用Aspen Plus建立嚴謹製程模型，並連結MATLAB作為最佳化平台。研究中以機械式蒸氣再壓縮（MVR）為基礎HPAD架構，並進一步建立包含進料預熱（FP）、壓縮機入口預熱（CIP）及預壓縮分流（PCS）之自回熱（SHR）超結構。最佳化過程則採用多起始點模擬退火法，以總年度成本（TAC）為最小化目標函數，並以性能係數（COP）評估系統能源效率。研究結果顯示，相較於MVR系統，FP可藉由降低再沸器熱負荷與壓縮機功率，有效改善系統能源與經濟表現；CIP則可透過提升壓縮機入口物流之供熱能力，獲得相近的改善效果。將FP與CIP結合後，系統之最高COP可進一步提升至9.116，但兩種熱回收路徑之效益並非單純疊加，而需透過系統化最佳化進行評估。相較之下，在本研究所探討之熱量匹配條件下，PCS無論單獨使用或與其他策略結合，皆未被最佳化結果選用。電價靈敏度分析顯示，最高COP架構即使在全球最高企業用電價格下，仍具有較傳統蒸餾降低主要能源操作成本之潛力。整體而言，本研究所建立HPAD架構與最佳化流程，可系統化評估不同熱整合方案，並辨識兼具能源效率與經濟可行性之蒸餾設計，可作為後續蒸餾節能、熱整合及製程電氣化研究之參考。

Distillation is widely employed in the chemical industry, yet its substantial energy demand makes it a major target for decarbonization and process electrification. Heat pump-assisted distillation (HPAD) recovers low-temperature overhead heat to reduce external utility consumption, but its performance depends strongly on the HPAD configuration, heat-integration pathway, and operating conditions. This study examined propylene/propane separation using a rigorous Aspen Plus model coupled with MATLAB-based optimization. Mechanical vapor recompression (MVR) served as the reference configuration, and a self-heat recuperation (SHR) superstructure incorporating feed preheating (FP), compressor inlet preheating (CIP), and pre-compressor splitting (PCS) was developed. Multi-start simulated annealing was applied to minimize total annualized cost (TAC), while the coefficient of performance (COP) was adopted to quantify energy efficiency. FP improved performance by reducing reboiler duty and compressor power, whereas CIP reduced compression demand by increasing the heat-supply capability of the compressed overhead stream; both strategies lowered TAC. Combining FP and CIP increased the maximum COP to 9.116, although the benefits of the two heat-recovery pathways were not directly additive. PCS was not activated, whether applied independently or in combination with the other strategies, under the investigated heat-matching conditions. The electricity-price sensitivity analysis further indicated that the highest-COP configuration could still provide a lower major energy-related operating cost than conventional distillation even at the highest business electricity price considered. Overall, the proposed framework provides a systematic approach for assessing HPAD heat-integration alternatives and identifying energy-efficient, economically viable distillation designs.

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