碩士生: 馮卡莎 (印度籍)
畢業年分: 2023年7月
論文名稱: 整合流體化床與史特靈引擎之熱電聯產系統設計與優化(中文) / Design and optimization of combined heat power system incorporated with fluidized bed and Stirling engine (英文)
中文摘要:
本研究旨在提升與改良一套熱電共生（CHP）系統，透過將流化床生質燃料燃燒器與史特林引擎結合，以發展兼具穩定性與高效能的再生能源轉換技術。由於系統效能高度依賴燃燒穩定性與熱端傳熱效率，因此本研究特別著重於確保史特林引擎、水盤加熱端及流化床燃燒器之穩定操作，以避免因燃燒或傳熱波動而影響整體發電效能。
實驗裝置設計上，將史特林引擎置於流化床燃燒器上方，並與燃燒器出口連結以驅動發電。在操作測試過程中，生質燃料的供給速率調整於 9.5 至 17 g/min 之間，並維持 50–60 L/min 的穩定進氣流量，以確保燃燒條件可控。為優化操作參數，本研究採用田口法設計九組實驗條件，分別針對流化床操作區域、材料溫度與出口溫度進行系統性測試。
經最佳化後，進行煙氣分析以評估燃燒效率，量測項目包含氧氣、二氧化碳、一氧化碳與氮氧化物，藉此掌握污染物生成與燃燒穩定性。實驗結果顯示，於最佳參數下，系統能同時降低有害排放並有效提升熱能傳輸，進而增強史特林引擎的發電效率。
綜合而言，本研究證明流化床與史特林引擎整合可行，並展現於小型熱電共生系統中的應用潛力。研究同時突顯燃燒動態與傳熱穩定性的重要性，亦驗證田口法於操作條件優化上的有效性。實驗成果不僅深化對小型 CHP 系統的理解，也為未來分散式能源系統的設計提供可靠依據。
英文摘要:
The primary objective of this research was to enhance the performance and reliability of a combined heat and power (CHP) system by integrating a fluidized bed biofuel combustor with a Stirling engine. Cube-scale systems such as this hold potential for decentralized renewable energy generation, but their effectiveness depends heavily on operational stability and optimized combustion conditions. Particular attention in this work was directed toward ensuring stable operation of the Stirling engine, the heated end of the water tray, and the fluidized bed combustor, as fluctuations in these components can severely affect system efficiency and power output.
An experimental setup was designed in which a Stirling engine was mounted above the fluidized bed combustors and directly linked to the combustor outlet to generate electricity. During interval operation testing, the biomass feed rate in the fluidized bed was varied between 9.5 and 17 g/min, while maintaining a consistent air flow rate of 50–60 L/min to ensure controlled combustion. To determine optimal operating conditions, the Taguchi method was employed, generating nine sets of experimental conditions that systematically varied the fluidized bed operating area, material temperature, and outlet temperature.
After identifying optimized parameters, flue gas analysis was conducted to evaluate combustion efficiency. Key emissions including oxygen, carbon dioxide, carbon monoxide, and nitrogen oxides were measured, providing insight into pollutant formation and overall combustion stability. The optimized setup achieved improved performance by reducing harmful emissions while maintaining sufficient thermal energy transfer to the Stirling engine.
This research demonstrates the feasibility of integrating a fluidized bed biofuel system with a Stirling engine for efficient combined heat and power generation. The results underscore the importance of system stability, particularly in the coordination between combustion dynamics and heat transfer to the Stirling engine. Moreover, the application of the Taguchi optimization method proved effective for identifying robust operating conditions. The experimental findings contribute to the understanding of small-scale CHP systems and highlight their potential as sustainable solutions for decentralized energy production, with improved reliability, efficiency, and emissions performance.
