As a new energy technology, solar thermal power generation technology is the key development direction of the country's energy planning during the 'Twelfth Five-Year Plan' period, and is also the main technical field for promoting the 'energy saving and efficiency improvement' strategy. As the core technology of solar thermal power generation, storage The selection and preparation of hot materials is particularly important. The molten salt has many unique performance advantages such as large heat capacity, low viscosity, low vapor pressure, wide temperature, etc., and has become the first choice for CSP energy storage materials.
China has abundant solar energy resources, especially in the Qinghai-Tibet Plateau. The annual total solar radiation in Qinghai Province is above 2000kWh/m2, and the annual sunshine hours are over 3200 hours. At the same time, it has the conditions of grid access, cooling water source and a large amount of desertified land. It is very suitable for the construction of large-scale solar thermal power stations. Salt Lake in Qinghai Province is rich in potassium, magnesium, sodium and other salts. It is rich in mineral resources and can reduce the production cost of related phase change energy storage materials, which will help promote the large-scale development of solar energy. Optimization of energy structure adjustment.
The research team of the Yanhu Resources Chemistry Laboratory of the Qinghai Salt Lake Research Institute of the Chinese Academy of Sciences conducted the basic research on molten salt energy storage materials by using the potassium, sodium and magnesium salts of the salt lake resources in the Qaidam Basin of Qinghai as raw materials. The salt lake resources are used as raw materials to create the preparation technology of molten salt heat storage materials for binary and multi-nitrate system. The thermal properties of molten salt with higher specific heat and thermal conductivity are explored, and the maximum use temperature of nitrate molten salt system is improved. , the process of reducing the melting point of the process, obtained the phase diagram data of the multi-component nitrate system, and has established a data model that can predict the melting point of the system, providing a sufficient technical basis for industrial production. On this basis By adding magnesium nitrate, a low-melting ternary molten salt energy storage material is prepared; and the carbon nanotubes are introduced into the nitrate system to further improve its thermal conductivity. This not only provides a theory for the preparation of nitrate molten salt heat storage materials. The foundation also opens up more possibilities for its application in CSP. For details, see Salt Lake Research, 2018, Issue 2 'Research Highlights', page 1-8.
Raman Spectroscopy of MWCNTs Doped Solar Salt Composite at 300 °C
Thermophysical properties of two different purity NKMs: (a) industrial grade ternary salt TG-DSC; (b) high purity ternary salt TG-DSC; (c) density; (d) viscosity; (e) specific heat; f) thermal conductivity
