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Low-melting-point mixed molten salt heat transfer and thermal storage working medium and application thereof

A technology of mixing molten salt and low melting point, used in heat exchange materials, chemical instruments and methods, etc., can solve the problems of high melting point of molten salt, unable to meet the needs of melting point of heat transfer working medium, etc. The effect of stable physical properties and good heat transfer performance

Inactive Publication Date: 2015-12-30
百吉瑞(天津)新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The melting point of a single-component molten salt is too high to meet the melting point requirements of heat transfer fluids

Method used

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  • Low-melting-point mixed molten salt heat transfer and thermal storage working medium and application thereof
  • Low-melting-point mixed molten salt heat transfer and thermal storage working medium and application thereof

Examples

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Embodiment

[0018] Embodiment: a kind of low melting point mixed molten salt heat transfer heat storage working medium, is made of Ca(NO 3 ) 2 4H 2 O. KNO 3 、NaNO 3 、LiNO 3 and Na 2 CO 3 Composition, its mass ratio is: Ca(NO 3 ) 2 4H 2 O: 16-27wt%; KNO 3 : 49-57wt%; NaNO 3 : 5-13wt%; LiNO 3 : 6-12wt%; Na 2 CO 3 : 4-11wt%.

[0019] A preparation method of a low melting point mixed molten salt heat transfer and heat storage working medium is as follows:

[0020] (1) First mix the Ca(NO 3 ) 2 4H 2 O. KNO 3 、NaNO 3 、LiNO 3 and Na 2 CO 3 The materials are crushed and ground separately, so that the diameter of the solid particles is less than 3cm, and the materials are put into stainless steel containers in proportion, and mixed and stirred;

[0021] (2) Gradually heat the mixed molten salt, while stirring continuously to about 120°C and keep it for 10 minutes, and evaporate the water in the mixed molten salt;

[0022] (3) Continue to heat up to about 200°C and maintain ...

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Abstract

The invention belongs to the field of mixed molten salt as an energy storage material and particularly relates to a low-melting-point mixed molten salt heat transfer and thermal storage working medium and an application thereof. The working medium is characterized by comprising components in percentage by weight as follows: 16wt%-27wt% of Ca(NO3)2*4H2O, 49wt%-57wt% of KNO3, 5wt%-13wt% of NaNO3, 6wt%-12wt% of LiNO3 and 4wt%-11wt% of Na2CO3. The application of the low-melting-point mixed molten salt heat transfer and thermal storage working medium is characterized in that the working medium is widely applied to the medium-and-high-temperature heat transfer and thermal storage fields of solar thermal power generation energy storage, wind curtailment and photoelectricity curtailment as well as coal-to-electricity thermal storage heating or industrial waste heat recovery storage. The preparation components of the mixed molten salt are low in cost, and the preparation technology is quite simple. The thermophysical property of the mixed molten salt is quite stable, the phenomenon of separation of a single component in a use process is avoided, the mixed molten salt has the good heat transfer property in a liquid temperature zone, and the saturated steam pressure is lower than 2 atmospheres. The working medium has little metal corrosion and has a wide application range.

Description

technical field [0001] The invention belongs to the field of mixed molten salts for energy storage materials, and in particular relates to a low melting point mixed molten salt heat transfer and heat storage working fluid and its application. Background technique [0002] Solar thermal power generation, nuclear power, medium and high temperature heat storage, heat supply, chemical industry, drying, process industry and other fields all require medium and high temperature heat transfer and heat storage working fluid. One of the main application aspects of medium and high temperature heat transfer fluids, that is, solar thermal power generation technology has been developed since the 1980s. Thermal storage working medium, because molten salt has the advantages of "four highs and three lows" such as high service temperature, high thermal stability, high specific heat capacity, high convective heat transfer coefficient, low viscosity, low saturated vapor pressure, and low price,...

Claims

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Application Information

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IPC IPC(8): C09K5/12
Inventor 薛凌云马重芳王志伟
Owner 百吉瑞(天津)新能源有限公司
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