He jishu (May 2022)
Numerical analysis and verification of internal heat source in a pebble bed heated by electromagnetic induction in HTS molten salt high temperature test loop
Abstract
BackgroundThe pebble bed heat transfer experimental facilities in the high temperature test loop of HTS (Heat Transfer Salt) molten salt is designed to study the heat transfer characteristics of molten salt and fuel pebble. The intermediate frequency induction heating is adopted to provide the internal heat source in the graphite pebble bed, which simulates the heat released by the fuel pebbles in the core of the MSRs.PurposeThis study aims to get better heating effect by analyzing the internal heat source of electromagnetic induction heating.MethodsThe finite element method was used to numerically simulate the electromagnetic induction heating of the experimental device. By analyzing the distribution of eddy current power in the experimental device under different number of graphite pebbles and coil parameters, the influence law of different design parameters on the electromagnetic induction heating performance was obtained and compared with the experimental results.ResultsThe simulation results show that the eddy current power of the graphite pebble near the edge of the coil is obviously small. When the cross-sectional area of the induction coil of the heater is 40 mm2 and the number of winding turns is 31, the heating effect can meet the experimental requirements. In the current experiment, the close distance between the metal seal structure and the coil is easy to produce eddy current power, resulting in power loss.ConclusionsThe comparison with the experimental data shows that the numerical simulation can predict the experimental results well when considering the heat leakage of the experimental device, and provide some suggestions on the optimization of the current experimental device as well as design reference for the experimental study using electromagnetic induction heating.
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