关键词: 太阳能热发电, 储热, 熔盐储罐, 预热, 数值模拟, 热应力

Abstract: Based on the numerical method, the temperature distribution and thermal stress distribution of molten salt storage tank in stepped preheating process were calculated. The effects of temperature end difference and inlet flow rate of preheating gas on preheating time and maximum thermal stress of tank were analyzed. The results show that when the temperature end difference and mass flow rate double, the preheating time is shortened by 78.1% and 61.5%, respectively. Tthe temperature end difference is more significant on the preheating process of molten salt storage tank than the mass flow rate. The research results provide theoretical guidance for high efficiency, low cost and safe preheating of concentrated solar power plant.

Key words: solar thermal power generation, heat storage, molten salt storage tank, preheating, numerical simulation, thermal stress