单罐中纳米熔盐蓄放热性能研究
STUDY ON HEAT STORAGE AND HEAT TRANSFER OF NANO-MOLTEN SALT IN SINGLE TANK SYSTEM
-
摘要: 为获得纳米熔盐在布置有浸没式换热器的单罐系统中的释热规律,该文在四元混合硝酸盐中加入SiO2纳米粒子,并采用实验的方式分析添加纳米粒子后对单罐系统蓄、放热性能的影响。结果表明,纳米粒子的加入可提高熔盐的流动性,蓄热过程中熔盐罐内温度达到均匀一致所需时间缩短了17.9%;释热过程中推迟了换热器附近盐温的下降速度,并强化了熔盐的对流传热能力。纳米粒子的加入使得单罐蓄热系统的有效释热时间延长16%,累积释热量增大13.8%。本文的研究可为纳米熔盐在蓄热系统中的应用及单罐蓄热系统的优化提供理论依据。Abstract: In order to obtain the heat release law of nano molten salt in a single tank system with submerged heat exchanger,SiO2 nanoparticles were added to the quaternary mixed nitrate,and the effects of adding nanoparticles on the thermal storage and heat release performance of a single tank system were analyzed experimentally.The results show that the addition of nanoparticles can improve the fluidity of molten salt.The time required for the uniform temperature in the molten salt tank during the heat storage process is shortened by 17.9%.The process of heat release delays the rapid decrease of salt temperature near the heat exchanger and strengthens the convective heat transfer ability of molten salt.The addition of nanoparticles extended the effective heat release time of the single-tank heat storage system by 16% and increased the cumulative heat release by 13.8%.This study will provide theoretical basis for the application of nano molten salt in heat storage system and the optimization of single tank heat storage system
下载:
