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Mixed molten salt heat transfer and storage working medium and preparing method and application thereof

A technology of mixing molten salt and heat storage, applied in lighting and heating equipment, chemical instruments and methods, heating devices, etc. The effect of stability, simple preparation process and good heat transfer performance

Inactive Publication Date: 2016-05-04
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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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0017] Embodiment: A kind of mixed molten salt heat transfer heat storage working medium, formula is made of Ca(NO 3 ) 2 、KNO 3 、NaNO 3 、LiNO 3 and K 2 CO 3 composition;

[0018] The mass ratio of each component is Ca(NO 3 ) 2 : 13.4wt%; KNO 3 : 56~60wt%; NaNO 3 : 6~15wt%; LiNO 3 : 9 ~ 14wt%; K 2 CO 3 : 8~13wt%.

[0019] A method for preparing a mixed molten salt heat transfer and heat storage working fluid, the steps of the method are as follows:

[0020] (1) First mix the Ca(NO 3 ) 2 、KNO 3 、NaNO 3 、LiNO 3 and K 2 CO 3 Each material is crushed and ground separately, so that the diameter of the solid particle is less than 3cm, and each material is put into a stainless steel container 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 this...

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Abstract

The invention belongs to the field of the energy storage material mixed molten salt, and particularly relates to a mixed molten salt heat transfer and storage working medium. The mixed molten salt heat transfer and storage working medium is characterized by being prepared from 13.4 wt% of Ca(NO3)2, 56-60 wt% of KNO3, 6-15 wt% of NaNO3, 9-14 wt% of LiNO3 and 8-13 wt% of K2CO3, the melting point of the mixed molten salt heat transfer and storage working medium is 102 DEG C, and the boiling point of the mixed molten salt heat transfer and storage working medium is 623 DEG C. The application of the mixed molten salt heat transfer and storage working medium is characterized in that the mixed molten salt heat transfer and storage working medium is applied to medium-high-temperature heat transfer and storage fields including solar heat power generation energy storage, wind and photoelectricity curtailment and 'coal to electricity' thermal storage heating and industrial waste heat recovery and storage. The constituents for preparing mixed molten salt are low in cost, and the preparing process is extremely simple. The thermophysical property of the mixed molten salt is quite stable, separation of any constituent does not occur in use, heat transfer property is high in the liquid state temperature zone, and saturated vapor pressure is lower than two atmospheres. The corrosion capacity to metal of the working medium is low.

Description

technical field [0001] The invention belongs to the field of mixed molten salts for energy storage materials, and in particular relates to a mixed molten salt heat transfer and heat storage working fluid, a preparation method and an application thereof. 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/12F24J2/34
CPCC09K5/12F24S60/00Y02E10/40Y02P20/129Y02P80/20
Inventor 刘斌薛凌云王志伟宋杰
Owner 百吉瑞(天津)新能源有限公司
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