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Lithium-containing molten salt creosote thermal transmission heat storage medium, preparation and uses thereof

A carbonic acid molten salt, heat storage medium technology, applied in chemical instruments and methods, heating devices, solar thermal devices, etc., can solve the problems of high melting point and high maintenance cost of molten salt, achieve low melting point, improve heat storage capacity, strengthen The effect of latent heat of phase transition

Inactive Publication Date: 2009-08-19
SUN YAT SEN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the temperature difference in this system is only 200°C, and the melting point of the molten salt is as high as 567°C, making the system too expensive to maintain after sunset

Method used

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  • Lithium-containing molten salt creosote thermal transmission heat storage medium, preparation and uses thereof
  • Lithium-containing molten salt creosote thermal transmission heat storage medium, preparation and uses thereof
  • Lithium-containing molten salt creosote thermal transmission heat storage medium, preparation and uses thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Mix sodium chloride and lithium carbonate with a mass ratio of 0.02:1 and stir evenly, statically heat until the solids are completely melted, then keep warm for 15 minutes, then naturally cool to room temperature and pulverize to obtain the additive.

[0036] Mix 39% potassium carbonate, 46% sodium carbonate, and 15% additives by mass and stir evenly, heat statically until the solids are completely melted, then keep warm for 10 minutes, then naturally cool to room temperature and pulverize to obtain the lithium-containing Carbonated molten salt heat transfer heat storage medium.

[0037] The melting point, latent heat of phase transition and thermal stability of the prepared lithium-containing carbonate molten salt were measured. The determination was carried out with a general differential scanning (DSC) instrument and a thermogravimetric analysis (TGA) instrument. The DSC curve obtained from the determination is as follows figure 1 Shown in curve b. Adopt the same...

Embodiment 2

[0042] Mix sodium chloride and lithium carbonate with a mass ratio of 0.12:1 and stir evenly, statically heat until the solids are completely melted, then keep the temperature for 20 minutes, then naturally cool to room temperature and pulverize to obtain the additive.

[0043] Mix 46% potassium carbonate, 36% sodium carbonate, and 18% additives by mass and stir evenly, heat statically until the solids are completely melted, then keep warm for 15 minutes, then naturally cool to room temperature and pulverize to obtain the lithium-containing Carbonated molten salt heat transfer heat storage medium.

[0044] Using the same method as in Example 1, the melting point, latent heat of phase change and thermal stability of the molten salt were measured. The measurement results show that the melting point of the prepared lithium-containing carbonate molten salt is 396°C, the latent heat of phase change is 71J / g, and the temperature corresponding to the 99% residual rate of lithium-cont...

Embodiment 3

[0046] Sodium chloride and lithium carbonate with a mass ratio of 0.03:1 were mixed and stirred evenly, statically heated until the solids were completely melted, and then kept for 10 minutes, then naturally cooled to room temperature and pulverized to obtain the additive.

[0047] Mix 36% of potassium carbonate, 42% of sodium carbonate, and 22% of the additive by mass and stir evenly, statically heat until the solids are completely melted, then keep the temperature for 25 minutes, then naturally cool to room temperature and pulverize to obtain the Lithium carbonate molten salt heat transfer heat storage medium.

[0048] Using the same method as in Example 1, the melting point, latent heat of phase change and thermal stability of the molten salt were measured. figure 2 It is shown that the melting point of the prepared lithium-containing carbonate molten salt is 390° C., and the latent heat of phase change is 102 J / g. Figure 7 The temperature corresponding to the 99% remain...

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Abstract

The invention discloses a lithium containing molten carbonate heat transmission and storage medium, a preparation method and the application thereof. The lithium containing molten carbonate heat transmission and storage medium comprises potassium carbonate, sodium carbonate and additive, wherein, the additive consists of sodium chloride and lithium carbonate. The lithium containing molten carbonate heat transmission and storage medium can meet the need of high temperature heat utilization of solar energy, more particularly, the operating temperature range required by using solar energy to produce hydrogen and reforming methane through solar energy supercritical heat power generation and solar energy thermal chemical reaction. The heat transmission and storage medium has good thermal stability, more latent heat of phase change, low lower limit of usage temperature, lower requirements for the size and energy of the system, high energy utilization rate and good effects.

Description

technical field [0001] The invention relates to high-temperature heat utilization technology of solar energy, in particular to a lithium-containing carbonate molten salt heat transfer and heat storage medium as well as its preparation method and application. Background technique [0002] Solar energy has the disadvantages of intermittent and unstable supply, which cannot meet the requirements of large-scale industrial continuous energy supply. In order to effectively solve the conversion, storage and transportation problems of renewable energy, it is necessary to develop efficient heat transfer and heat storage technology. In the medium and high temperature heat utilization technology of solar energy, the heat transfer and heat storage media currently used mainly include: air, mixed oil, water / steam, metals such as sodium and aluminum, and molten salts. Among them, molten salt as a heat transfer medium can reach a higher temperature, and at the same time has a heat storage ...

Claims

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Application Information

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IPC IPC(8): C09K5/12F24J2/00C01B3/02
CPCY02E10/40Y02P20/10Y02P20/129Y02P20/133Y02P20/54
Inventor 丁静魏小兰杨建平廖敏杨晓西
Owner SUN YAT SEN UNIV
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