Font Size: a A A

Experimental Research On Molten Salt Corrosion Property And Optimization

Posted on:2008-11-09Degree:MasterType:Thesis
Country:ChinaCandidate:L P SunFull Text:PDF
GTID:2121360215994831Subject:Thermal Engineering
Abstract/Summary:PDF Full Text Request
In order to improve the environment and meet the increasing demand for energy, it is the best way to solve the above problems to develop and utilize solar energy. The high temperature solar heat transfer and storage is the key technology in solar thermal field. The heat transfer and storage medium affects the efficient and the cost of the solar thermal power system.First of all, this paper demonstrates the physics property and structure, including heat storage and melting point law of mixture molten salt. The mixture molten salts have lower melting point than the pure salt, and the heat storage and heat capacity change at the same time.In order to select proper ratio of chlorine salt, we investigate the melting point and heat fusion and heat capacity of 36 kinds of different ratios of chlorine salt. We evaluate the economy and heat performance of these different kinds of molten salt and find the best kind of ratio for the cheapest and best performance in solar thermal heat transfer and storage system. All these mixtures have two melting point around 400℃and 460,the largest heat storage is 279.1J/g ,which is MgCl2,NaCl,KCl(0.2-0.5-0.3,in weight). We integrate the economy and thermal performance, and find the mixture with ratio (0.2-0.7-0.1, in weight) has the best result.We calculate the cost of different heat storage, including sensible and latent heat storage. The cost includes the steel which are heat exchanger and tank and the molten salt which is heat storage medium. At last we find that sensible is the best way to storage energy in solar thermal power system.At last, we test the compatibility between stainless steel and chlorine salt. We put the four kinds of stainless steel which are 304,316L, 321 and 310SS in chlorine salt. Then we keep the temperature at 500℃from two hours to 15 days, and measure the weight loss of the stainless after clearing the corrosion production. We find the chlorine salt attack the stainless steel very badly. Comparing with the nitrate salt mixtures, the chloride salt has too much corrosion in the molten salt. So we have to develop the coat which can protect the stainless steel in the high temperature molten chlorine salt.
Keywords/Search Tags:solar energy, heat storage, heat transfer, corrosion, molten salt
PDF Full Text Request
Related items