摘要
热稳定性是限制有机工质在有机朗肯循环(Organic Rankine Cycle,ORC)使用的重要因素。硅氧烷类工质具有低毒环保、化学性质稳定等优点,适用于150~350℃热源。本文研究了六甲基二硅氧烷(MM)工质热分解的特点及其对ORC系统的影响,结果表明,MM的热分解产物为硅氧烷类化合物及微量气态小分子碳氢化合物;热分解将导致系统性能下降,分解量足够大时,会出现蒸发器换热不充分导致膨胀机入口处工质干度低于1从而影响机组安全的问题。
Thermal stability is an important factor on limiting the use of working fluids in Organic Rankine Cycle(ORCs).Siloxanes with low toxicity,environmental-friendly characteristic,chemical stability and other advantages are promising working fluids for heat source varied between150~350℃.The work of this paper was the experimental study on the thermal decomposition of hexamethyldisiloxane(MM) and the effect of decomposition on ORC system.The results showed that the products were other siloxanes and a small quantity of gaseous hydrocarbons,In addition,the decomposition can lead to performance degradation and insufficient evaporation at the outlet of heat exchanger.
作者
李赫
戴晓业
史琳
LI He;DAI Xiao-Ye;SHI Lin(Key Laboratory of Thermal Science and Power Engineering of Ministry of Education of China,Department of Thermal Engineering,Tsinghua University,Beijing 100084)
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2020年第1期77-82,共6页
Journal of Engineering Thermophysics
基金
国家自然科学基金重点项目(No.51806117)
国家自然科学基金创新研究群体(No.51621062)
中国博士后科学基金资助项目(No.2018M630155)
关键词
有机朗肯循环
热稳定性
六甲基二硅氧烷
系统性能
Organic Rankine Cycle(ORC)
thermal stability
hexamethyldisiloxane(MM)
system performance
