High-heat-conductivity MgO doped molten nitrate heat-transfer and heat-storing material as well as in-situ generation method and application thereof

A technology of in-situ generation method and heat storage material, which is applied to high thermal conductivity MgO doped nitric acid molten salt heat transfer and heat storage material and its in-situ generation method and application fields, can solve the problem of phase separation between molten salt liquid and solid particles, nitric acid Problems such as low thermal conductivity of molten salt, to achieve the effect of improving thermal conductivity, increasing specific heat, and reducing pumping power consumption

Pending Publication Date: 2018-05-08
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the problem of low thermal conductivity of molten salt of nitric acid in the prior art, and the shortcomings and deficiencies that the mechanical method of adding nanoparticles can effectively improve the thermal conductivity of molten salt, and at the same time, in order to overcome the existing mechanical stirring method of adding solid particles It is difficult to effectively solve the defect of phase separation between molten salt liquid and solid particles caused by particle agglomeration. The primary purpose of the present invention is to provide an in-situ generation method of high thermal conductivity MgO doped nitric acid molten salt heat transfer and heat storage materials

Method used

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  • High-heat-conductivity MgO doped molten nitrate heat-transfer and heat-storing material as well as in-situ generation method and application thereof
  • High-heat-conductivity MgO doped molten nitrate heat-transfer and heat-storing material as well as in-situ generation method and application thereof
  • High-heat-conductivity MgO doped molten nitrate heat-transfer and heat-storing material as well as in-situ generation method and application thereof

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Embodiment 1

[0031] A method for preparing a high thermal conductivity MgO-doped nitric acid molten salt heat transfer and heat storage material by an in-situ generation method, the specific implementation steps are as follows:

[0032] Dried potassium nitrate and sodium nitrate are mixed by the lowest eutectic point ratio of its binary phase diagram to obtain the raw material mixture I of nitric acid molten salt; (NO 3 ) 2 ·6H 2 O was added to mixture I to obtain Mg(NO 3 ) 2 ·6H 2 O-doped nitric acid molten salt raw material mixture II. After mixing the mixture II evenly, the temperature was raised to 420°C at a heating rate of 10°C / min until the molten salt melted, and reacted at a constant temperature for 10 hours to form a uniformly suspended MgO-doped nitric acid molten salt fluid without phase separation, and cooled naturally to room temperature. Mechanical pulverization to obtain a high thermal conductivity MgO doped nitric acid molten salt heat transfer heat storage material. ...

Embodiment 2

[0037] A method for preparing a high thermal conductivity MgO-doped nitric acid molten salt heat transfer and heat storage material by an in-situ generation method, the specific implementation steps are as follows:

[0038] Dried potassium nitrate and sodium nitrate are mixed by the lowest eutectic point ratio of its binary phase diagram to obtain the raw material mixture I of nitric acid molten salt; then according to the mass ratio equivalent to MgO: nitric acid molten salt is 3.5:96.5 ratio, MgCl 2 ·6H 2 O was added to mixture I to give MgCl 2 ·6H 2 O-doped nitric acid molten salt raw material mixture II. After the mixture II is mixed evenly, the temperature is programmed to 450°C at a heating rate of 10°C / min until the molten salt is melted, and the constant temperature is reacted for 15 hours to form a uniformly suspended MgO-doped nitric acid molten salt fluid without phase separation, which is naturally cooled to room temperature. Mechanical pulverization to obtain a...

Embodiment 3

[0041] A method for preparing a high thermal conductivity MgO-doped nitric acid molten salt heat transfer and heat storage material by an in-situ generation method, the specific implementation steps are as follows:

[0042] Dried potassium nitrate and sodium nitrate are mixed by the lowest eutectic point ratio of its binary phase diagram to obtain the raw material mixture I of nitric acid molten salt; (NO 3 ) 2 ·6H 2 O was added to mixture I to obtain Mg(NO 3 ) 2 ·6H 2 O-doped nitric acid molten salt raw material mixture II. After the mixture II was mixed evenly, the temperature was raised to 500°C at a heating rate of 10°C / min until the molten salt melted, and reacted at a constant temperature for 24 hours to form a uniformly suspended MgO-doped nitric acid molten salt fluid without phase separation, and cooled naturally to room temperature. Mechanical pulverization to obtain a high thermal conductivity MgO doped nitric acid molten salt heat transfer heat storage materi...

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Abstract

The invention belongs to the fields of large-scale utilization of renewable energy sources as well as storage and transfer of heat energy, and discloses a high-heat-conductivity MgO doped molten nitrate heat-transfer and heat-storing material as well as an in-situ generation method and application thereof. The method comprises the following steps: mixing dried potassium nitrate and sodium nitrateaccording to the lowest eutectic point of a binary phase diagram to obtain a raw material mixture I of molten nitrate; adding magnesium chloride hexahydrate or magnesium nitrate hexahydrate into the mixture I according to the mass ratio of MgO to molten nitrate being (2.5-10.0):(97.5-90.0) to obtain a magnesium chloride hexahydrate or magnesium nitrate hexahydrate doped molten nitrate raw materialmixture II; after mixing the mixture II uniformly, heating to 420 to 500 DEG C through a program, and maintaining constant temperature for 10 to 24 hours to guarantee in-situ generation and crystallization of MgO to form MgO doped molten nitrate uniform fluid; and naturally cooling the fluid to room temperature to obtain the high-heat-conductivity MgO doped molten nitrate heat-transfer and heat-storing material.

Description

technical field [0001] The invention belongs to the field of large-scale utilization of renewable energy and thermal energy storage and transmission, and particularly relates to a high thermal conductivity MgO-doped nitric acid molten salt heat transfer heat storage material and its in-situ generation method and application. Background technique [0002] High-efficiency heat transfer and heat storage technology can effectively solve the problems of intermittent and unstable energy supply in the process of large-scale utilization of solar energy and recovery of industrial waste heat, and can effectively improve energy conversion and utilization efficiency. Among them, the development of high-efficiency heat transfer and heat storage materials is the key to the development of high-efficiency heat transfer and heat storage technologies. [0003] Molten salt has the characteristics of high working temperature, low vapor pressure, wide working temperature range, good thermal stab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/12F28D20/00
CPCC09K5/12F28D20/0034F28D2020/0047Y02E60/14Y02E70/30Y02P20/10
Inventor 魏小兰尹月陆剑锋丁静王维龙
Owner SOUTH CHINA UNIV OF TECH
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