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

A technology of mixing molten salt and heat storage, which is applied in the direction of chemical instruments and methods, heat exchange materials, etc., can solve the problems of high melting point of molten salt and inability to meet the melting point of heat transfer working medium, etc., and achieve simple preparation process, heat exchange The effect of stable physical properties and good heat transfer performance

Inactive Publication Date: 2017-08-18
百吉瑞(天津)新能源有限公司
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  • Abstract
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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

[0018] Example: a mixed molten salt heat transfer and heat storage working medium, composed of Ca(NO 3 ) 2 , KNO 3 , NaNO 3 and NaNO 2 composition;

[0019] The mass ratio of each component is: Ca(NO 3 ) 2 : 17.3 wt%; KNO 3 : 40-45wt%; NaNO 3 : 4-10wt%; NaNO 2 : 30-38wt%.

[0020] A preparation method of mixed molten salt heat transfer and heat storage working medium, the method steps are as follows:

[0021] (1) First, the Ca(NO) to be mixed 3 ) 2 , KNO 3 , NaNO 3 and NaNO 2 The materials are pulverized and ground separately, so that the diameter of the solid particles is less than 3cm, and each material is put into a stainless steel container in proportion, and mixed and stirred;

[0022] (2) gradually heating the mixed molten salt, and at the same time, keep stirring to about 120 ° C and keep it for 10 minutes, and evaporate the water in the mixed molten salt;

[0023] (3) Continue to heat up to about 200°C and maintain this temperature, increase the stirrin...

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Abstract

The invention belongs to the field of 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 consisting of the following components by mass: 17.3 wt% of Ca(NO3)2, 40-45 wt% of KNO3, 4-10 wt% of NaNO3 and 30-38 wt% of NaNO2, and has the melting point of 85 DEG C and the boiling point of 590 DEG C. 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 the medium-high-temperature heat transfer and storage field of solar thermal power generation energy storage, wind and photoelectricity curtailment and 'coal to electricity' heat storage and supply or industrial waste heat recovery and storage. Mixed molten salt is low in component cost and extremely simple in preparation process, has very stable thermophysical property, is free from separation of a certain component in the use process, has favorable heat transfer performance in a liquid temperature zone, and has the saturated steam pressure of lower than two atmospheres. The mixed molten salt heat transfer and storage working medium is low in metal corrosivity and wide in application.

Description

technical field [0001] The invention belongs to the field of mixed molten salt of energy storage materials, and in particular relates to a mixed molten salt heat transfer and heat storage working medium, a preparation method and an application thereof. Background technique [0002] Solar thermal power generation, nuclear power, medium and high temperature heat storage, heating, 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 the medium and high temperature heat transfer working fluid, that is, the solar thermal power generation technology has been developed since the 1980s. Thermal heat storage working fluid, because molten salt has the advantages of "four highs and three lows", such as high operating temperature, high thermal stability, high specific heat capacity, high convective heat transfer coefficient, low viscosity, low saturated va...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/12
CPCC09K5/12
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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