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Mixed nitrate heat-transfer and heat-storage working medium and application thereof

A nitrate and heat storage technology, which is applied in the field of mixed nitrate heat transfer and heat storage working medium, can solve the problems of high melting point of molten salt and cannot meet the needs of melting point of heat transfer working medium, etc., and achieves simple preparation process and thermal physical properties. The effect of stable, good heat transfer performance

Inactive Publication Date: 2016-03-09
百吉瑞(天津)新能源有限公司
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  • Summary
  • Abstract
  • Description
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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

[0017] Embodiment: a kind of mixed nitrate heat transfer heat storage working medium, by Ca(NO 3 ) 2 4H 2 O. KNO 3 、NaNO 3 and LiNO 3 composition; the mass ratio of each component is Ca(NO 3 ) 2 4H 2 O: 15-22wt%; KNO 3 : 50-56wt%; NaNO 3 : 10-18wt%; LiNO 3 : 9-20wt%.

[0018] A mixed nitrate heat transfer heat storage working medium, the preparation method steps are as follows:

[0019] (1) First mix the Ca(NO 3 ) 2 4H 2 O. KNO 3 、NaNO 3 and LiNO 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;

[0020] (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;

[0021] (3) Continue to heat up to about 200°C and maintain this temperature, increase stirring intensity, and Ca(NO 3 ) 2 4H 2 The crystal...

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Abstract

The invention belongs to the field of mixed molten salts of energy storage materials, and specifically relates to a mixed nitrate heat-transfer and heat-storage working medium. The working medium is characterized by being composed of, by mass, 15 to 22 wt% of Ca(NO3)2.4H2O, 50 to 56 wt% of KNO3, 10 to 18 wt% of NaNO3 and 9 to 20 wt% of LiNO3. The application of the mixed nitrate heat-transfer and heat-storage working medium is characterized in that the working medium is applied in the fields of medium-high temperature heat transfer and heat storage of solar-thermal power-generation energy storage, heat storage and heat supply of waste wind and photoelectricity and coal-converted electricity, or recovery and storage of industrial waste heat. According to the invention, the mixed molten salt has the advantages of low cost of preparation components, simple preparation process, stable thermophysical property, no occurrence of a separation phenomenon of a single component in the application process, and good heat-transfer performance in a liquid temperature range; meanwhile, saturated vapor pressure is lower than 2 atm. The working medium provided by the invention has low corrosivity to metals.

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 nitrate 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, it has been favored b...

Claims

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Application Information

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IPC IPC(8): C09K5/12
CPCC09K5/12
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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