Research On Coated Composite Phase Change Heat Storage Body In Electric Healing Energy Storage

In order to solve the problem of wind abandonment in the development of wind power in China,the heat storage technology has been further developed in recent years.The use of abandoned wind power for heat storage and heating is the main way to absorb wind power in China.The principle is to store intermittent abandoned wind power in the form of thermal energy and release the stored heat during the peak period of heating or power supply.It has broad research and application prospects.Heat storage materials are the core components of electric heat storage boilers.Therefore,the development of heat storage materials with high heat storage performance is of great significance for the dissipation of wind power in China and the transformation of China's energy structure.In this paper,NaCl was selected as the phase change material,SiC and Al2O3 were used as matrix materials,and aluminum dihydrogen phosphate was added as the binder.The mixed sintering process was used to successfully prepare the inorganic salt-ceramic composite phase change heat storage material.In this paper,the preparation process and preparation process of composite phase change heat storage materials are introduced in detail,and the process parameters of the materials are finally determined through experimental research.The microstructure of the materials is observed by SEM;the parameters such as weight loss rate before and after sintering are determined;The phase analysis of the composite phase change heat storage material was performed;the phase change latent heat and thermal conductivity of the material were measured using DSC and Hot Disk,and the heat storage and thermal conductivity of the material were tested;the compressive strength of the material was tested using a universal testing machine Strength.The experimental results show that the analysis of the weight loss rate and weight loss curve before and after sintering requires that the temperature be increased slowly in the early stage of sintering to ensure that impurities in the sample are completely escaped and the temperature increase rate is fast in the later stage of sintering to reduce the residence of the phase change material in the molten state Time to ensure that it can adhere to the microgrid structure of the ceramic matrix.The content of phase change material is 20%-35%,and the maximum sintering temperature is 850?.The XRD analysis results show that the composite phase change material is not new during high temperature sintering.Phase generation,good chemical compatibility between the phase change material and the ceramic matrix;SEM analysis showed that the ceramic matrix formed a complete skeleton structure after sintering,the phase change material was adsorbed in the micro network structure of the ceramic material,and the phase change material was prepared Success;DSC analysis shows that the material has the best heat storage performance when the phase change material ratio is 30%,its phase change latent heat is 141.63 J/g,which shows that the material has strong heat storage capacity;final phase change material ratio is determined to be 30%;thermophysical analysis tests show that when the phase change material ratio is 30%,the thermal conductivity of NaCl-SiC composite phase change heat storage material is 3.0649W/m-1·K-1,which proves the material have good thermal conductivity;compressive strength of NaCl-SiC composite phase change heat storage material after sintering is 16MPa,the actual work to meet the needs;the encapsulated material present more serious cracks during the sintering process,this problem is for further study.