Molten nano-carbonate heat transfer and accumulation medium, and preparation method and application thereof

A heat storage medium and carbonate molten salt technology, applied in chemical instruments and methods, heat exchange materials, etc., can solve problems such as pipeline blockage and maintenance costs, achieve large phase change latent heat, widen the working temperature range, heat absorption and Good heat storage effect

Active Publication Date: 2014-07-16
QINGHAI ENESOON NEW MATERIAL TECH & SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practical applications, such a melting point is still relatively high, which is likely to cause pipeline blockage or high maintenance costs. How to effectively reduce the melting point of carbonate molten salt is an important problem faced by solar thermal power generation and thermal storage.

Method used

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  • Molten nano-carbonate heat transfer and accumulation medium, and preparation method and application thereof
  • Molten nano-carbonate heat transfer and accumulation medium, and preparation method and application thereof
  • Molten nano-carbonate heat transfer and accumulation medium, and preparation method and application thereof

Examples

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preparation example Construction

[0056] The preparation method of the carbonic acid nano molten salt heat transfer heat storage medium of the present invention is as follows:

[0057] 1) Preparation of metal oxide nanoparticles MgO and / or non-metal oxide nanoparticles SiO by gas phase method 2 (Note that the nanoparticles in this step can be obtained commercially, and the commercially obtained nanoparticles can also achieve the purpose of the present invention);

[0058] 2) Mix sodium chloride and lithium carbonate evenly and add them to the molten salt tank from the feeding port, open the valve between the interlayer and the solar heat collection system to let the heat carrier heated by the solar heat collection system flow to the interlayer and statically heat it into the molten salt tank The solids are all melted, kept for 10-30 minutes, naturally cooled to room temperature and crushed mechanically;

[0059] Then add potassium carbonate and sodium carbonate to the molten salt tank, stir to mix evenly to o...

Embodiment 1～25

[0065] Examples 1-25 were all obtained according to the above-mentioned preparation method. Table 1 shows the formulations of various examples of the present invention and the particle sizes of nanoparticles in the formulations, as well as the formulation (X1) of carbonate molten salts according to the prior art. Among them, the Chinese invention patent with application number 200910037348.7 discloses a lithium-containing carbonate molten salt Salt heat transfer heat storage medium and its preparation method, X1 is lithium-containing carbonate molten salt (without nanoparticles) obtained by the inventor according to the formula and preparation method described in Example 4 of the specification;

[0066] Table 1. Formula of carbonate nano molten salt and particle size of corresponding nanoparticles

[0067]

[0068]

[0069]

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Abstract

The invention provides a molten nano-carbonate heat transfer and accumulation medium, and a preparation method and an application thereof, and belongs to the technical field of heat storage and transmission. The molten nano-carbonate heat transfer and accumulation medium contains a molten carbonate system formed by potassium carbonate, sodium carbonate, lithium carbonate and sodium chloride, nanoparticles are added into the molten carbonate system, and the nanoparticles are metal oxide and/or nonmetal oxide; and the nanoparticles are dispersed into the molten carbonate system, and the molten nano-carbonate heat transfer and accumulation medium is formed through compounding. The melting point of molten nano-carbonate is low, so the molten nano-carbonate heat transfer and accumulation medium has an upper limit use temperature of 800DEG C, has a good heat stability and a high heat conductivity, and is very suitable for the heat accumulation and transfer systems of industrial energy accumulation and solar photo-thermal power generation.

Description

technical field [0001] The invention belongs to the technical field of heat storage and transfer, and relates to a composite heat storage and heat transfer medium, in particular to a carbonic acid nano-molten salt heat transfer and heat storage medium and its preparation method and application. Background technique [0002] In industrial energy storage and solar thermal power generation technologies, the heat storage and heat transfer media currently used mainly include air, water, heat transfer oil, molten salt, sodium and aluminum and other metals. Molten salt has become a potential heat transfer and heat storage medium in solar thermal power generation technology due to its wide operating temperature range, low vapor pressure, low viscosity, good stability, and low cost. A relatively mature heat transfer and heat storage medium. High-temperature molten salts mainly include carbonates, nitrates, sulfates, fluorides, chlorides, oxides, etc. [0003] The existing nitric ac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/12
Inventor 曾智勇
Owner QINGHAI ENESOON NEW MATERIAL TECH & SCI CO LTD
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