电磁感应加热陶瓷颗粒装置的实验研究

Abstract The development of efficient and rapid electric thermal conversion technology is an important approach to accommodating the unstable power generated by photovoltaic and wind energy sources. Combining the principles of electromagnetic induction heating with the high-temperature resistance characteristic of ceramic particles, a high temperature electromagnetic induction heating ceramic particles device (EIHCPD) is proposed. Ferromagnetic balls are freely stacked inside a quartz tube, forming porous channels. Electromagnetic induction heating coils are wound around the exterior of the quartz tube. Ferromagnetic balls can be rapidly heated under the effect of electromagnetic induction. Ceramic particles flow through the porous channels, exchanging heat with the ferromagnetic balls, thereby achieving high-temperature heating. Research shows that compared to foam iron structure, the electromagnetic induction heating of stacked ferromagnetic particles exhibits better temperature uniformity. Under electrical power of 2049 W and a ceramic particle mass flow rate of 5.0 g/s, the time constant of the EIHCPD is 26.3 min. Increasing the electric power and mass flow rate can evidently enhance the heating power of the ceramic particles. Smaller electric power and higher mass flow rate can more easily achieve the thermal steady state. Under thermal steady state condition, the heating efficiency of the EIHCPD can reach 97.6 %. In EIHCPD, the ferromagnetic balls serve as internal heat sources, compared to traditional wall heating method, the large specific surface area significantly enhances heat exchange capability, resulting in high electric thermal energy conversion efficiency.