Solar photo-thermal power generation heat conduction and storage medium and preparation method thereof
A technology of photothermal power generation and heat storage medium, applied in the field of solar thermal power generation, can solve problems such as lowering melting point and lowering thermal conductivity, and achieves the effects of improving thermal conductivity, good compatibility and improving utilization efficiency
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[0030] The present invention also provides a preparation method of the above-mentioned solar thermal power generation heat transfer heat storage medium, specifically, the preparation method includes the following steps:
[0031] In step S1, the nitrate molten salt heat storage medium and the carbon nanotubes are ground and mixed uniformly to obtain a raw material powder.
[0032] Specifically, in the raw material powder, the mass percentage of the carbon nanotubes is controlled to be 0.1%-1%, and the diameter d of the carbon nanotubes is controlled to be ≥ 10nm, preferably 10nm-20nm.
[0033] Further, the nitric acid molten salt heat storage medium includes uniformly mixed sodium nitrate and potassium nitrate; and, the mass percentage of sodium nitrate in the raw material powder is controlled to be 59%-60%, and the mass percentage of potassium nitrate is 39%-40%.
[0034] In step S2, the raw material powder is heated and melted and kept for at least 1 hour to obtain a molten m...
Embodiment 1
[0040] This example provides a method for preparing the heat transfer and heat storage medium for solar thermal power generation. The specific method is as follows: firstly, mix 58.88% sodium nitrate, 39.92% potassium nitrate and 0.20% carbon nanotubes uniformly to obtain Mixed powder; among them, sodium nitrate and potassium nitrate can be collectively referred to as nitrate molten salt heat storage medium; then, the mixed powder is heated and melted in a muffle furnace at 400°C, and after it is completely melted, it is kept at a constant temperature for 60 minutes. A molten mixture is obtained; finally, the molten mixture is cooled to room temperature and mechanically pulverized to obtain a carbon nanotube-doped composite nitric acid molten salt heat storage medium, that is, a heat transfer heat storage medium for solar thermal power generation.
[0041] In this way, this embodiment obtains a solar thermal power generation heat transfer heat storage medium through the above p...
Embodiment 2
[0045] In the description of Embodiment 2, the similarities with Embodiment 1 will not be repeated here, and only the differences with Embodiment 1 will be described. The difference between Example 2 and Example 1 is that in the preparation method of Example 2, 59.82% of sodium nitrate, 39.88% of potassium nitrate and 0.30% of carbon nanotubes are uniformly mixed to obtain a mixed powder; at the same time , heating and melting the mixed powder in a muffle furnace at 340° C. After all the melting, keep the temperature at a constant temperature for 150 minutes to obtain a molten mixture; for the rest, refer to the description in Example 1 to obtain a solar thermal power generation heat transfer heat storage medium.
[0046] Thus, in the solar thermal power generation heat transfer heat storage medium of this embodiment, the difference between it and the solar thermal power generation heat transfer heat storage medium in Embodiment 1 is that the solar thermal power generation heat...
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