Research And Measurement About Molten Salt Thermal Conductivity

The thermal conductivity is the melt important thermal parameters which characterize the thermal conductivity of the melt. Among the design of the heat exchanger, heat the working medium selection process, the thermal conductivity is an important basis for the design and selection. About various references in the current,there are less data about the thermal conductivity of various fluids, how to measure the thermal conductivity of the melt effectively has a very important practical significance. This study includes two parts: Firstly,the thermal conductivity of the design system, and means for measuring the melt thermal conductivity,so that it can measure the melt thermal conductivity in kinds of temperature ranges accurately and simply. Secondly, the study measured three-unit nitrate molten salt thermal conductivity and thermal conductivity of molten cryolite as the data basis and reference in the heat exchanger design and selection process of the working medium, but also can solve shortage of the important parameters in the ANSYS simulation analysis of the physical-field calculation process.There are many ways for thermal conductivity measurements, in accordance with the mechanism of macro measurement methods can be divided into steady state and non-steady state method, different measurement methods have different advantages and disadvantages, and test ranges. Based on the steady state theory in the steady-state plate method, this study designed to measure the thermal conductivity of the device system, and by measuring the thermal conductivity of molten potassium nitrate with reference to relevant literature providing a reference thermal conductivity, while using ANSYS finite element analysis device simulation accordingly verify the accuracy of measuring devices.Three-unit molten nitrate chemical industry is the main temperature of the heating medium, which serves as a kind of good heat storage medium has been widely used industrially. Especially it as a heat storage medium in the solar thermal power generation application pays more attention. Reliability of property data is regarded as the important prerequisite for industrial applications of molten salt heat transfer medium in thermal storage, especially in the determination of thermal conductivity. This study uses a mixture regression test design to research ternary nitrate molten salt mass fraction of each substance and thermal conductivity of the regression equation, and through the hit rate test measurements made on experimental analysis.In masonry of industrial aluminum cell, the thermal conductivity is one of the basis for furnace building material selection, because the design often requires the cell to the bottom of the insulation effect, less heat dissipation side to reduce heat loss, the size of the thermal conductivity direct has impact on how much heat loss. In the course of the cell, the groove lining material is subjected to penetration of electrolyte corrosion, thermal conductivity of the material will be affected, the overall thermal conductivity of the material will change. Typically, the older the electrolysis bath, the greater the change in thermal conductivity. Thermal conductivity of significance is more great in actual production. So this study regard molten cryolite electrolyte system as the object of study to analyze and determine its thermal conductivity. Through the study, because molten cryolite electrolyte system needs to be heated to above1000℃, the experimental device for measuring the temperature range of thermal conductivity has errors, so this paper discuss the text of the error generation factors to do a detailed analysis and recommendations.