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

作　　者：DAI Xiaoye SHI Lin QIAN Weizhong 

机构地区：[1]Department of Chemical Engineering,Tsinghua University,Beijing 100084,China [2]Department of Energy and Power Engineering,Tsinghua University,Beijing 100084,China

出　　处：《Journal of Thermal Science》2020年第1期25-31,共7页热科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (51806117, 51236004);China Postdoctoral Science Foundation funded project (2018M630155);the Science Fund for Creative Research Group (No. 51621062)

摘　　要：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.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.

关 键 词：organic Rankine cycle(ORC) material compatibility high temperatures hexamethyldisiloxane(MM) 

分 类 号：TK115[动力工程及工程热物理—热能工程] O627.41[理学—有机化学]