Study on discharging characteristics of solid heat storage bricks: Experiment and simulation

Abstract

With the proposal of China’s “double carbon” goal, the use of new energy power generation will gradually replace fossil energy power generation, which requires energy storage technology to store. The discharging characteristics of the energy storage units have a great impact on the system performance. The discharging characteristics of solid heat storage magnesia bricks were studied through simulation and experiment. The experimental results showed that the discharging completion of 6-channel was 5% higher than that of 2-channel at the end of discharging. The discharging completion of 12 m/s wind velocity was 3% higher than that of 6 m/s. Through simulation, the heat extraction of 6 channels was 15.8% and 3.3% higher than that of 2-channel and 4-channel, and the heat extraction of 9 m/s was 0.2% and 2.9% higher than that of 6 m/s and 12 m/s. The error between simulation and experiment was less than 10%, which verified the accuracy of the model and proved that it can be extended to other working conditions. It is recommended to use 6-channel heat storage bricks and the wind velocity shall not exceed 12 m/s.

Keywords

• Solid heat storage
• Electric heating boiler
• Fluid structure coupling
• Convective heat transfer