A nano with high specific heat capacity 3 Phase change heat storage material and preparation method thereof

A technology of heat storage material and high specific heat capacity, applied in heat exchange materials, chemical instruments and methods, etc., can solve the problems of low specific heat capacity, high cost of nanoparticle synthesis, and inability to be applied in a large number of industrial applications, and achieves simple and cost-effective methods. low effect

Active Publication Date: 2020-11-17
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cost of nanoparticle synthesis is high, and it cannot be used in a large number of industries, and its increased specific heat capacity is not very high.

Method used

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  • A nano with high specific heat capacity <sub>3</sub> Phase change heat storage material and preparation method thereof
  • A nano with high specific heat capacity <sub>3</sub> Phase change heat storage material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A kind of NaNO with high specific heat capacity 3 The heat storage material, the preparation method thereof specifically comprises the following steps:

[0024] (1) Pretreatment: Weigh 4.25g NaNO 3 and 1.5g urea, grind it for 10min to make it fully mixed, put it into the test tube; add 15ml deionized water to the test tube, fully dissolve; put the test tube into the water bath and heat it for 2h, the temperature of the water bath is 100°C, and ultrasonically oscillate for 30min, so that the solution Mix well, and the resulting mixed solution is put into a crucible and waits to be ignited;

[0025] (2) Combustion modification: Preheat the temperature of the well furnace to 500°C; put the crucible containing the mixed solution obtained in step (1) into the well furnace to ignite, and take out the sample in the crucible after igniting for 15 minutes, thereby obtaining Modified NaNO 3 The heat storage material is NaNO with high specific heat capacity 3 Heat storage mate...

Embodiment 2

[0028] A kind of NaNO with high specific heat capacity 3 The heat storage material, the preparation method thereof specifically comprises the following steps:

[0029] (1) Pretreatment: Weigh 4.25g NaNO 3 and 3g of urea, grind it for 10 minutes to make it fully mixed, put it into the test tube; add 15ml deionized water to the test tube, fully dissolve; put the test tube in a water bath and heat it for 2 hours, the temperature of the water bath is 100°C, and ultrasonically oscillate for 30 minutes to make the solution fully Mix, and the resulting mixed solution is put into a crucible and waits to be ignited;

[0030] (2) Combustion modification: Preheat the temperature of the well furnace to 500°C; put the crucible containing the mixed solution obtained in step (1) into the well furnace to ignite, and take out the sample in the crucible after igniting for 15 minutes, thereby obtaining Modified NaNO 3 The heat storage material is NaNO with high specific heat capacity 3 Heat ...

Embodiment 3

[0033] A kind of NaNO with high specific heat capacity 3 The heat storage material, the preparation method thereof specifically comprises the following steps:

[0034] (1) Pretreatment: Weigh 4.25g NaNO 3 and 6g of urea, grind it for 10 minutes to make it fully mixed, put it into the test tube; add 15ml deionized water to the test tube, fully dissolve; put the test tube in a water bath and heat it for 2 hours, the temperature of the water bath is 100°C, and ultrasonically oscillate for 30 minutes to make the solution fully Mix, and the resulting mixed solution is put into a crucible and waits to be ignited;

[0035] (2) Combustion modification: Preheat the well furnace temperature to 500°C; put the crucible containing the mixed solution obtained in step (1) into the well furnace and ignite it, and take out the sample in the crucible after igniting for 15 minutes to obtain Modified NaNO 3 The heat storage material is NaNO with high specific heat capacity 3 Heat storage mate...

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Abstract

The invention discloses a NaNO3 heat storage material high in specific heat capacity. The material is prepared with NaNO3 as a raw material and urea as fuel through modification by using a solution combustion method. The stoichiometric ratio of the raw material NaNO3 to the fuel urea is 2:(1-4). The phase of the NaNO3 heat storage material obtained through the method is still NaNO3, linear structures, needle-shaped structures, spherical structures and other special structures grow on the surface of the material and in the material, the solid-state specific heat capacity can be increased to 1.87 J / (g DEG C) and is increased by 43.8% compared with that of ordinary NaNO3, and the liquid-state specific heat capacity can be increased to 1.86 J / (g DEG C) and is increased by 51.2% compared with that of the ordinary NaNO3. The NaNO3 heat storage material has the advantages of being high in specific heat capacity, special in structure and the like, a modification method is simple, and a new idea is provided for modification of the molten salt heat storage material.

Description

technical field [0001] The invention relates to a kind of NaNO with high specific heat capacity 3 A base heat storage material and a preparation method thereof, the material relates to the energy field and is applied in the field of solar thermal power generation. Background technique [0002] Solar energy is the most commonly used energy source in life, but it is limited by natural conditions such as day and night, seasons, etc., which greatly limits the large-scale use of solar energy. Therefore, solving the problem of solar energy storage is the development trend of solar energy utilization today. Many power stations in the world use molten salt as heat storage material for solar energy. Suitable salts for solar energy storage include NaCl, KCl, NaNO 3 and KNO 3 , because these inexpensive salts and salt mixtures can cover a very large temperature range from 208°C to 800°C, i.e. suitable for concentrating solar power plants and industrial processes. [0003] The melti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 李元元施大伟程晓敏
Owner WUHAN UNIV OF TECH
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