Fatty acid/modified fly ash composite phase change energy storage material and preparation method thereof

A technology of composite phase change and energy storage materials, which is applied in the field of fatty acid/modified fly ash composite phase change materials and its preparation, can solve the problems of reducing the service life of energy storage materials, low thermal conductivity of fatty acids, volume expansion, etc., and achieve The effect of prolonging the service life, good heat storage performance, and reducing the phase transition temperature

Inactive Publication Date: 2020-01-03
SHANGHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Fatty acids have broad application prospects in the field of low-temperature phase change energy storage, but fatty acids have the disadvantages of low thermal conductivity, liquid leakage and volume expansion during the solid-liquid phase transition process, which will not only reduce the service life of energy storage materials, but also pollute the surrounding environment

Method used

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  • Fatty acid/modified fly ash composite phase change energy storage material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1. Weigh 3.2g of myristic acid and 1.8g of palmitic acid respectively and place them in a reaction vessel, and heat the reaction vessel at 65°C to melt all the myristic acid and palmitic acid in the reaction vessel. Stirring was continued for 40 minutes at this temperature, and the rotation speed was 200 r / min, so that the fatty acids were fully mixed.

[0024] 2. Weigh 5.0 g of fly ash (25% of fly ash with a particle size of 5 μm, 20 μm, 30 μm, and 40 μm), and prepare 200 mL of citric acid solution of 0.75 mol / L with deionized water. Mix it with fly ash in a beaker, heat and stir in a constant temperature water bath at 50°C for 3 hours, filter it with suction, wash it with deionized water until the solution is neutral, and dry it in a constant temperature drying oven to constant weight to obtain the modification fly ash.

[0025] 3. Weigh 5.0 g of the myristic acid-palmitic acid binary eutectic mixture in step 1, melt it at a temperature of 60°C, add 5.0 g of the modi...

Embodiment 2

[0027] 1. Weigh 2.7g of myristic acid, 1.6g of palmitic acid, and 0.7g of stearic acid and place them in a reaction vessel, heat the reaction vessel in a water bath at 70°C to completely melt the fatty acids, turn on the magnetic stirring, and magnetic stirring The rotating speed is 200r / min, the temperature is 70°C, and the stirring time is 35min, so that the fatty acids are fully mixed.

[0028] 2. Same as 2 and 3 in Embodiment 1. The myristic acid-palmitic acid-stearic acid / modified fly ash composite phase change material is sample two.

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Abstract

The invention relates to a fatty acid/modified fly ash composite phase change material and a preparation method thereof. The composite phase change energy storage material comprises the following components in parts by mass: 50-55 parts of a monobasic fatty acid or polybasic fatty acid eutectic mixture and 45-50 parts of modified fly ash, wherein the modified fly ash is II-grade fly ash meeting the GB/T1596-2017 national standard, fly ash micro-powder with the particle size of 5-40 microns is obtained through an ultrafine process, and the modified fly ash is obtained through citric acid. Fly ash with different particle sizes is used as a phase change material carrier, a citric acid corrosion modification method is adopted for the phase change material carrier, the adsorption performance and the pore capacity of the fly ash are improved, the fatty acid/modified fly ash composite phase change energy storage material is prepared through a melt mixing method, and the problem that fatty acid-based phase change material liquid is prone to leakage is solved. The preparation process is simple, the raw materials are cheap and easy to obtain, good economic benefits and wide application prospects are achieved, and the compositephase change material can be widely applied to the field of phase-change materials.

Description

technical field [0001] The invention relates to a fatty acid / modified fly ash composite phase change material and a preparation method thereof, belonging to the field of energy-saving phase change energy storage materials. Background technique [0002] With the continuous consumption of fossil energy, the energy supply crisis is becoming more and more serious. The development of new energy and the recovery and utilization of industrial waste heat are becoming more and more important to solve the increasingly serious energy crisis and environmental pollution. Whether it is solar energy, wind energy and other new energy sources, or waste heat in traditional industries, they all have typical instability, periodicity and intermittency. In order to ensure the efficient and stable operation of new energy and industrial waste heat recovery systems, people use phase change energy storage Materials store these energies. [0003] Fatty acids have the advantages of high energy storage...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 丁益民赖榕永谢雯倩王温馨陆文雄
Owner SHANGHAI UNIV
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