Study On Preparing And Properties Of The Multi-inorganic Energy Storage Materials Used On Concentrating Solar Energy For Electricity Generation

Energy is one of the most serious problems which the world and Chinese socio-economic development facing. The shortage of fossil fuels and environment problem according, directly influent the implement process of sustainable development strategy of human society in the future. In recent years, every country is developing new energy. The solar energy has been paid extensively attention by people as a kind of non-environmental-damage and infinite natural energy source. It is the focus by people researching that using solar energy to generate electricity, but solar energy is unbalanced in the energy supply. Now one of the difficulties in a solar electric generating system is the thermal storage, it can be to generate electricity uninterrupted when there is no insolation.Now the thermal storage materials used extensively is molten salt phase change material, but it has a deathful disadvantage that it will erode the heat eXchange tubes and hot storage tanks. In this experiment, by using for reference of preparing fireproof concrete, we will prepare concrete thermal energy storage. The work content of this article is:1. By using for reference of preparing fireproof concrete, it prepares the concrete thermal energy storage material by using fireproof aluminates cement to be the gelatinizer, and using high heat capacity and waste copper residue to be aggregate, using some activated powders to replace some cements, and using cyanite powders to be the expensive agent. It improves the heat conductivity of thermal storage materials by adding some graphite powders;2. The paper researches the flexural and compression strength of thermal storage materials, and confirms the best proportion and preparing technology; it also researches the relationship of changes of compression strength of concrete thermal energy storage by different content of graphite powders and analyses them; the results show that: the strength of thermal storage material reduces obviously by the increasing of the content of graphite powders;3. The paper researches the distensibility and heat capacity and heat conductivity of the thermal storage material, and the results show that: the rate of shrinkage of the concrete thermal energy storage enlarges gradually by the temperature lifting, so does the heat capacity and the heat conductivity of the concrete thermal energy storage; it gains the best working temperature range by researching; 4. This paper calculates theoretical coefficient of heat conductivity of the thermal storage materials, and compares with the data testing in experiment; the results show that the errors between theoretical and measured data are less than 5%. The theoretical coefficient of heat conductivity of concrete thermal energy storage is 2.345 w/(m·k) when the mass percentage of graphite powders is 5%.The results show that: the modified fireproof concrete is one of the perfect materials that are used to be the solar energy thermal storage for generating electricity.