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A low-melting-point nano-molten salt heat transfer heat storage medium and its preparation method

A technology of heat storage medium and low melting point, which is applied in the field of physical heat transfer and energy storage in high and new technology, can solve the problems of high melting point, low thermal conductivity and high melting point of molten salt, achieve cost reduction, good heat transfer and heat storage capacity, The effect of specific heat improvement

Active Publication Date: 2017-11-21
河北井矿新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantages of currently used molten salts are high melting point (130-230°C), small specific heat, and low thermal conductivity.
Currently, KNO has been developed 3 -NaNO 3 -LiNO 3 -Ca(NO 3 ) 2 Molten salt system, its melting point is around 90°C, which solves the problem of high melting point of molten salt

Method used

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  • A low-melting-point nano-molten salt heat transfer heat storage medium and its preparation method
  • A low-melting-point nano-molten salt heat transfer heat storage medium and its preparation method
  • A low-melting-point nano-molten salt heat transfer heat storage medium and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The low melting point nano molten salt is composed of 99wt% low melting point salt and 1wt% SiO 2 Nanoparticles, wherein the low melting point salt consists of 55wt% potassium nitrate, 9wt% sodium nitrate, 18wt% lithium nitrate and 18wt% calcium nitrate, SiO 2 The particle size of the nanoparticles is 20 nm. The melting point of the low melting point nano molten salt was analyzed by DSC (differential scanning calorimetry), its decomposition temperature was analyzed by TG (thermogravimetry), and its specific heat was analyzed by DIN51007 standard method. The results show that its melting point is 114.1 ℃, the decomposition temperature is 604 ℃, and the specific heat of the formula low melting point nano molten salt in liquid state is about 1.8-2.0J / g.k. figure 1 is the DSC curve of this sample. figure 2 is the TG curve of this sample. image 3 is the specific heat test result of the sample.

[0042]Compared with the pure low melting point mixed molten salt, the low ...

Embodiment 2

[0045] The low melting point nano molten salt is composed of 99wt% low melting point salt and 1wt% Al 2 O 3 Nanoparticles, wherein the low melting point salt consists of 55wt% potassium nitrate, 9wt% sodium nitrate, 18wt% lithium nitrate and 18wt% calcium nitrate, Al 2 O 3 The particle size of the nanoparticles is 20 nm. The results show that its melting point is 108.8 °C, its decomposition temperature is 595 °C, and the specific heat of the formula low melting point nano molten salt in liquid state is about 2.4-2.6J / g.k. Figure 4 is the DSC curve of this sample. Figure 5 is the TG curve of this sample. Image 6 is the specific heat test result of the sample.

[0046] Compared with the pure low melting point mixed molten salt, the low melting point nano molten salt of the formula has a melting point increased by about 20°C, the decomposition temperature does not change greatly, and has a wider temperature range compared with the pure low melting point mixed molten salt....

Embodiment 3

[0049] The low melting point nano molten salt is composed of 99wt% low melting point salt and 1wt% TiO 2 Nanoparticles, wherein the low melting point salt consists of 55wt% potassium nitrate, 9wt% sodium nitrate, 18wt% lithium nitrate and 18wt% calcium nitrate, TiO 2 The particle size of the nanoparticles is 20 nm. The results show that its melting point is 112.2℃, its decomposition temperature is 579℃, and its specific heat is about 1.6-1.9J / g.k when the low-melting point nano molten salt is liquid. Figure 7 is the DSC curve of this sample. Figure 8 is the TG curve of this sample. Figure 9 is the specific heat test result of the sample.

[0050] Compared with the pure low melting point mixed molten salt, the low melting point nano molten salt of the formula has a melting point increased by about 20°C, and the decomposition temperature is slightly reduced, but it still has a wide range of use temperature.

[0051] At 300°C, the specific heat of the low melting point nan...

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Abstract

The invention discloses a low-melting-point nano molten salt heat transfer and storage medium and a preparation method and belongs to the technical field of physical heat transfer and energy storage in advanced technologies. The low-melting-point nano molten salt heat transfer and storage medium is prepared from low-melting-point mixed molten salt and nanoparticles in a composite mode. The low-melting-point mixed molten salt is mainly composed of potassium nitrate, sodium nitrate, calcium nitrate and lithium nitrate. The nanoparticles are nanoparticles of metallic oxide or nonmetallic oxide. According to the novel low-melting-point nano molten salt prepared through the method, the melting point is 80-130 DEG C, the decomposition temperature is approximately 600 DEG C, and compared with the low-melting-point mixed molten salt, the using temperature range of the low-melting-point nano molten salt does not change greatly, but the specific heat is improved remarkably by about 10-60%.

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] Because solar thermal power generation can be combined with low-cost and large-scale heat storage technology, it can provide stable high-quality electric energy, overcome the defects of poor power transmission quality and large impact on the power grid caused by the inability of large-scale use of batteries in wind and photovoltaic power plants. It is considered to be one of the most promising power generation methods in renewable energy power generation, and may become the main energy source in the future. [0003] At present, in the field of mature trough solar thermal power generation, commercial power stations use heat transfer oil as heat transfer medium, which leads to high cost of large-scale i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25D21/06C09K5/12
Inventor 吴玉庭张璐迪马重芳陈夏任楠
Owner 河北井矿新能源科技有限公司
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