High decomposition temperature mixed molten salt heat transfer heat storage medium
A technology of mixing molten salt and decomposition temperature, which is applied in the field of physical heat transfer and energy storage in high-tech, can solve the problems of no initial crystallization point data, increased temperature fluctuation, and high decomposition temperature, so as to simplify the initial operation procedure and increase safety Stability, effect of increasing decomposition temperature
Active Publication Date: 2022-05-24
BEIJING UNIV OF TECH
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Problems solved by technology
Although their melting point is lower than 100C, the DSC test results show that the sample has a large endothermic peak at ~150C; therefore, the sample does not form a good eutectic
Furthermore, the authors do not give data on the initial crystallization point
If the initial crystallization point is not taken into account, its application in system heat transfer will lead to increased temperature fluctuations and increased risk of freezing and blockage of pipes
Therefore, it is the main problem to find a mixed molten salt with high decomposition temperature and low melting point.
Method used
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Embodiment 1
[0026] The mixed molten salt is composed of 33wt% potassium nitrate, 27wt% sodium nitrite and 40wt% potassium carbonate. It is analyzed by DSC (Differential Scanning Calorimetry) and its melting point is 313°C. It is analyzed by TG (Thermogravimetry). , and its decomposition temperature is 715.4 °C. like figure 1 The DSC curve for this sample is shown. figure 2 The TG curve for this sample is shown. image 3 is the specific heat test result of the sample. Figure 4 for the density measurement of the sample. Figure 5 is the thermal diffusivity measurement for this sample. Image 6 The thermal conductivity measurement results for this sample. Figure 7 is the viscosity measurement result of this sample.
[0027] Compared with Solar Salt, the decomposition temperature of this formula is increased by nearly 135℃, and compared with Hitec salt, the decomposition temperature of this formula is increased by nearly 250℃, which has a wider temperature range. Compared with commo...
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Abstract
The high decomposition temperature mixed molten salt heat transfer heat storage medium belongs to the high-tech physical heat transfer energy storage technology field. The composition ratio of high decomposition temperature mixed molten salt heat transfer heat storage medium is as follows: 33wt% potassium nitrate, 27wt% sodium nitrite, 40wt% potassium carbonate, the decomposition temperature of this mixed molten salt is about 715.4, and the melting point is 313 ° C Wide operating temperature range. And compared with common heat storage materials, its average specific heat is 1.236J / (g·K), and the sensible heat storage cost is 51.37 yuan / (kW·h), the cost of the binary mixed molten salt is relatively considerable. Its thermal diffusivity is about 0.16mm2 / s, its thermal conductivity is about 0.206W / (m·K), and its viscosity and density are not significantly different from those of existing heat storage media.
Description
Technical field: [0001] The invention relates to a formula of mixed molten salt for medium and high temperature heat transfer and heat storage, belonging to the technical field of physical heat transfer and energy storage in high and new technology. Background technique: [0002] With the increasing popularity of global sustainable development, the concept of green energy and low-carbon life has attracted people's attention. Many countries have begun to conduct research on renewable energy such as wind energy, solar energy, biomass energy, geothermal energy, and ocean energy. Solar energy is one of the most popular energy sources due to its unlimited reserves, non-polluting, cost-effective and other characteristics. Concentrated solar thermal power (CSP) has long been regarded as the most promising way to utilize solar energy on a large scale, and it has rapidly entered the stage of commercial growth as an emerging industry to solve current energy, resource and environmenta...
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IPC IPC(8): C09K5/12
CPCC09K5/12
Inventor 吴玉庭娜荷芽张灿灿鹿院卫
Owner BEIJING UNIV OF TECH