清华大学戴晓业史琳等: 六甲基二硅氧烷作为高温有机朗肯循环工质的材料相容性研究

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

六甲基二硅氧烷作为高温有机朗肯循环工质的材料相容性研究

DAI Xiaoye, SHI Lin, QIAN Weizhong

戴晓业，史琳，骞伟中

清华大学

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下载链接或点击“阅读原文”

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

摘要

对于可再生能源和工业余热资源，有机朗肯循环（ORC）技术被认为是一种高效的能源回收利用技术。其中中高温ORC由于其高效率等优点，成为ORC技术的重要研究方向之一。对于中高温ORC系统来说，工质的材料相容性是保证系统稳定运行的基础。本文针对中高温ORC系统实际工况，确定部件、温度、材料等因素的对应关系，提出一套适用于ORC工质材料相容性研究的实验方法，并以六甲基二硅氧烷（MM）为例开展了实验研究。实验结果表明，在蒸发器金属材料的选择上，304不锈钢与MM的相容性要优于铜材料；在膨胀机出口密封材料的选择上，不建议使用氟橡胶；在工质泵润滑油的选择上，POE油与MM的相容性要优于白油。

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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