Study On The Aluminium Alloy Phase Change Thermal Storage Materials And System At High Temperature In Solar Thermal Power Generation

Energy is the basis of human existence and development. with the rapid development of global industry, fossil fuel is dwindling, which urgently requires the development and utilization of new energy. Solar energy is a great treasure-house, a kind of clean energy and convenient access. But solar radiation has significant disadvantages such as rarefaction, intermittence and instability. Thermal storage technology is one of the best ways to meet the production and use of solar energy for life. Among the storage technologies, solid-liquid phase change gains wide attention of scientists because of great thermal storage density, almost constant temperature, small change in the size during the process of storage and easy to control the process.Aluminum alloy phase change materials at high-temperature and thermal storage system are studied in this article. The phase-change thermal storage materials have big advantages such as high latent heat of phase change, large thermal storage density, properties stability and great thermal conductivity, which has great potential for development. The mechanism of high thermal storage density of aluminum alloy is studied in the article through the design of different components of aluminum alloy and thermal physical experiment.A efficient solar thermal storage material is selected.The proper design of thermal storage system can increase the storage capacity of thermal storage device, extend the service life of energy storage system and enhance the stability of the system. So the design is one of key factors for successful and efficient operation of whole thermal storage system. Several thermal insulation materials with good insulation properties have been chosen and calculated in heat transfer to optimize the design of insulation material combinations. High-temperature aluminum alloy can corrode ordinary stainless steel and carbon steel. In this paper, New type of ceramic material, heat-resistant steel and nickel-based high-temperature alloy are studied as heat pipe material to storage aluminum alloy by analyzing the high-temperature performance of ceramic material and corrosion mechanism of aluminum alloy to stainless steel. The system uses aluminum alloy as thermal storage material, the air as a heat medium. This system has seldom been studied, so in this paper the corresponding structure are designed, including the use of baffle, pipeline arrangement, heat exchange improvement, as well as the layout of inlet and vent. The average heat transfer coefficient of different thermal storage devices is calculated and compared. The three-dimensional models of different structure thermal storage devices are also mapped by three-dimensional computer graphics software UG NX4.The results show that Al-Si alloy has great prospects in solar energy thermal storagy at high temperature beceaue of its high density and great latent heat. The thermal storage devices and pipe materials chosen can meet the needs of the subject with full heat exchange and high heat efficiency. These works lay a foundation for following simulation and practical establishment of thermal storage device. This thermal storage system has great potential for development.