THERMAL STRESS AND FATIGUE LIFE ANALYSIS of MOLTEN SALT CENTRAL RECEIVER

摘要

The heat transfer, thermal stress and fatigue characteristics in a molten salt receiver which are induced by high concentrating irradiation heat flux are studied. The average heat flux 200kW/m~2, 400kW/m~2, 600 kW/m~2, 800 kW/m~2 are applied for the external surface of two kinds of different receiver tubes. And inlet molten salt flow rate are 1.5m/s, 2.5m/s and 3m/s, the corresponding Reynolds numbers are 17987, 29978 and 41969. Based on finite volume method, the temperature distribution in the receiver tube and molten salt are simulated. The finite element method is used to compute the thermal stress fields. It is shown that when the molten salt inlet velocity is 1.5m/s, the allowable average heat flux is 600 kW/m~2. And for the receiver panel, the fatigue life is 20025 cycles under maximum allowable heat flux.