有機朗肯與微型氣渦輪機複循環之性能分析與測試研究

Combined Cycle Study Using Organic Rankine Cycle and Microturbine

鄭丞祐

指導教授 ： 蔣小偉

國立清華大學/工學院/動力機械工程學系/碩士(2014年)

摘要

本研究乃是引進複循環(Combined Cycle)的設計概念，結合有機朗肯循環(ORC)，利用氣渦輪機(GT)運轉時排放高溫廢熱的特性，驅動ORC進行發電，目的為建立一微型有機朗肯與9KW氣渦輪機複循環系統。此系統主要利用GT發電系統中所產生的廢熱作為熱源，驅動有機朗肯循環之發電系統，進而使GT發電系統的廢熱能夠進行二次的應用，以提供額外的發電能力，完成複循環發電系統，並有效提高整體效率。
研究過程中，首先將會針對GT發電系統架設一實驗量測平台，並量測其在不同操作點、轉速及發電量下之排氣溫度及壓力等特性，並建立GT性能曲線及資料庫。接著針對其廢熱回收特性進行ORC之設計及模型建立，模擬不同有機工作流體特性和蒸發溫度在此系統下之表現，並探討熱交換效率對系統之影響，建立符合GT系統的ORC複循環模型。經過分析計算系統發電量與效率後，最終將完成一套有機朗肯與氣渦輪機複循環之性能分析系統，以評估ORC應用在微型氣渦輪機廢熱回收之可行性。

關鍵字

ORC

並列摘要

This proposed combined cycle starts with our existing 9 kW microturbine to be combined with a proposed micro ORC ycle. Basically, we will take the exhaust heat of 500~600°C from the microturbine to be input to the micro ORC cycle, so that we can take advantage of the waste heat from the turbine to the ORC cycle to generate additional power. The expected thermal efficiency can be increased from the current 15% to about 25%.
During the proposed process, we will start with the microturbine test stand so we can measure the exhaust temperature, flow rates, and pressure, under different operating conditions. With this in mind we can establish the baseline data to be used for choosing the compatible ORC system. Then we will start building the desired micro ORC model to complete our combined cycle design including ORC working fluid and vaporize temperature selection. After conducting the heat exchanger simulate testing with microturbine in place, we can establish a complete ORC/GT combined cycle design system and be able to demonstrate the expected efficiency target.

參考文獻

[01]. McDonald, C. F. and Wilson, D. G., “The Utilization of Recuperated and Regenerated Engine Cycles for High-Efficiency Gas Turbines in the 21st Century,” Applied Thermal Engineering Vol. 16, Nos 8/9, pp. 635-653, 1996.

[03]. Rodger, C.J., 2000, “25-5 Kwe Microturbine Design Aspects,” ASME Paper 2000-GT-0626, ASME Turbo Expo, Munich, Germany.

[05]. 徐士傑，“微型渦輪發電系統配套設計與性能測試”，2008年。

[06]. 莊秉勳，“微型渦輪發電系統之開發”，國立清華大學動力機械工程學系碩士論文，2012年7月。

[07]. Mokhtar Liamini, Hassan Shahriar, Srikar Vengallatore, and Luc G. Frechette, Member, IEEE, Member, ASME , “Design Methodology for a Rankine Microturbine: Thermomechanical Analysis and Material Selection,” Journal of Microelectromechanical system, Vol. 20, No. 1, February 2011.