多元卤化盐高温相变热储能研究与应用试验OA

High-temperature thermal energy storage is a large-scale energy storage method capable of implementing peak shaving and valley filling for the power grid,its stored thermal energy grade is high,and the conversion efficiency of thermal engine(i.e.Carnot cycle efficiency)is high.The thermophysical properties of multicomponent halogenated salt as high temperature thermal energy storage material and its compatibility with carbon steel at high temperature were studied,the technical problems of molten salt packaging method,energy storage and heating method,discharge structure design of energy storage system and other technical problems that need to be solved when multicomponent halogenated salts is used for high temperature phase change thermal energy storage are pointed out,specific solutions are proposed for each problem,the most critical is to put forward the technical scheme of dispersedly filling molten salt with molten salt box to form molten salt pile,solved the packaging problem for engineering applications of molten salts with temperatures up to 750℃or 800℃and alternating solid-liquid states.Based on the research contents,a test scheme for engineering application of high temperature phase change thermal energy storage technology of multicomponent halide salt is conceived,a set of test device is built according to the test scheme,and then conduct the test of heating by powering on storing heat and introduce water to generate steam to release heat,the experimental results indicate that,the multicomponent halide salts phase change thermal energy storage meets the performance requirements of high-temperature thermal energy storage,high energy storage temperature and high energy storage density,the energy storage system has a compact structure,the operation method is simple and easy,and from the experimental process and results,it can be seen that,using a molten salt box for dispersed filling of molten salt,for high-temperature halide salts,it is a suitable packaging method.This research project,along with the experimental setup and results,can provide reference for the engineering application of high-temperature phase change thermal energy storage technology using molten salt.