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Material Compatibility of Hexamethyldisiloxane as Organic Rankine Cycle Working Fluids at High Temperatures

六甲基二硅氧烷作為高溫有機朗肯循環工質的材料相容性研究

DAI Xiaoye, SHI Lin, QIAN Weizhong

戴曉業，史琳，騫偉中

清華大學

Corresponding author: SHI Lin

E-mail: rnxsl@mail.tsinghua.edu.cn

Journal of Thermal Science,2020,29(1): 25-31

https: //doi.org/10.1007/s11630-019-1147-z

Keywords: organic Rankine cycle (ORC), material compatibility, high temperatures, hexamethyldisiloxane (MM)

Springer Link下載鏈接或點擊“閱讀原文”

https://link.springer.com/article/10.1007/s11630-019-1147-z

摘? 要

對于可再生能源和工業余熱資源，有機朗肯循環（ORC）技術被認為是一種高效的能源回收利用技術。其中中高溫ORC由于其高效率等優點，成為ORC技術的重要研究方向之一。對于中高溫ORC系統來說，工質的材料相容性是保證系統穩定運行的基礎。本文針對中高溫ORC系統實際工況，確定部件、溫度、材料等因素的對應關系，提出一套適用于ORC工質材料相容性研究的實驗方法，并以六甲基二硅氧烷（MM）為例開展了實驗研究。實驗結果表明，在蒸發器金屬材料的選擇上，304不銹鋼與MM的相容性要優于銅材料；在膨脹機出口密封材料的選擇上，不建議使用氟橡膠；在工質泵潤滑油的選擇上，POE油與MM的相容性要優于白油。

Abstract

The organic Rankine cycle (ORC) is a promising technology for industrial waste heat recovery and renewable energy utilization. High temperature ORCs have attracted particular interest because of their high thermal efficiencies and outputs. The material compatibility of working fluid is a significant limitation for the working fluid selection and system design for high temperature ORCs. This work presents a method for studying the material compatibility of ORC working fluids based on the calculated conditions of the ORCs and matching of components, temperatures, and materials. Hexamethyldisiloxane(MM) was chosen as the test fluid. The experimental results show that 304 stainless steel has better compatibility with MM than copper as the material of evaporators. Fluoric rubber is not a suitable sealing material for high temperature ORCs with MM as the working fluids because of the bad compatibility. Mineral oil has better compatibility with MM than polyol ester (POE) lubricant as the lubricant for the fluid pump.

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