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Coal ash based composite phase-change thermal storage material and preparation method thereof

A technology of composite phase change and heat storage materials, which is applied in the field of fly ash-based composite phase change heat storage materials and its preparation, can solve the problems of poor thermal stability and weak heat storage performance, achieve good thermal stability and improve adsorption Sexuality and dispersibility, the effect of enhancing the heat transfer effect

Inactive Publication Date: 2017-12-22
汪逸凡
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention: Aiming at the problems of poor thermal stability and weak heat storage performance, a fly ash-based composite phase change heat storage material and its preparation method are provided

Method used

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  • Coal ash based composite phase-change thermal storage material and preparation method thereof

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example 1

[0021] Take 2g of expandable graphite into a mortar and grind it, pass through a 60-mesh sieve, put the sieved expandable graphite powder in a drying oven, dry it at 105 ° C to a constant weight, and then transfer it to a muffle furnace and heat it. to 850°C, heat preservation for 30s, cooled to room temperature, added to 75% ethanol solution, stirred at 180r / min for 20min, then transferred to an ultrasonic disperser for ultrasonic treatment for 5h, filtered to obtain a filter residue, washed with absolute ethanol The filter residue was placed in a vacuum drying oven for 2 times, and kept at 105 °C to constant weight to obtain expanded graphite flakes. Take 100 g of fly ash, put it into a muffle furnace, heat it to 600 °C for calcination for 2 hours, and add 500 g of 500 g after cooling to room temperature. The mass fraction is 1% citric acid solution, stirred at 50 °C for 2 h, filtered to obtain a filter cake, washed with deionized water until the washing liquid is neutral, tr...

example 2

[0023] Take 2.5g of expandable graphite into a mortar and grind it, pass through a 60-mesh sieve, put the sieved expandable graphite powder in a drying oven, dry it at 107 ° C to constant weight, and then transfer it to a muffle furnace, Heated to 900°C, incubated for 35s, cooled to room temperature, added to 75% ethanol solution, stirred at 210r / min for 25min, then transferred to an ultrasonic disperser for 6h ultrasonic treatment, filtered to obtain the filter residue, and used absolute ethanol. After washing the filter residue twice, put it in a vacuum drying oven, and at 107 ℃ to constant weight to obtain expanded graphite flakes, take 150g of fly ash, put it into a muffle furnace, heat it to 625 ℃ for 2 hours, cool to room temperature and add 750g of citric acid solution with mass fraction of 1% was stirred at 55 °C for 2 hours, filtered to obtain a filter cake, washed with deionized water until the washing liquid was neutral, transferred to a vacuum drying box, and dried ...

example 3

[0025] Take 3g of expandable graphite into a mortar and grind, pass through a 60-mesh sieve, put the sieved expandable graphite powder in a drying oven, dry it at 110 ° C to constant weight, then transfer it to a muffle furnace, heat to 950°C, incubated for 40s, cooled to room temperature, added to 75% ethanol solution, stirred at 240r / min for 30min, then transferred to an ultrasonic disperser for ultrasonic treatment for 8h, filtered to obtain a filter residue, washed with absolute ethanol After filtering the residue for 3 times, put it in a vacuum drying box, and at 110 ℃ to constant weight to obtain expanded graphite flakes, take 200 g of fly ash, put it into a muffle furnace, heat it to 650 ℃ for 3 hours, and add 1000 g of it after cooling to room temperature. The mass fraction is 1% citric acid solution, stirred at 60 °C for 3 hours, filtered to obtain a filter cake, washed with deionized water until the washing liquid is neutral, transferred to a vacuum drying box, and dr...

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Abstract

The invention belongs to the technical field of energy storage materials and relates to a coal ash based composite phase-change thermal storage material and a preparation method thereof. By treatment of expandable graphite, the interlamellar spacing and specific surface area of the expandable graphite are increased, and an ultrasonic stripping method is adopted for stripping into nano flakes; by diluted acid modification after high-temperature expanding treatment of coal ash, the specific surface area of the coal ash is increased, and adsorptivity and dispersity of the coal ash are improved; by expanded graphite flakes forming a heat conducting network in pores of the modified coal ash, energy stored by the phase-change material can be transferred more quickly, and heat transferring effects are improved; myristic acid, stearic acid and polyethylene glycol serve as ternary phase-change base materials and are uniformly embedded into the porous structure of the modified coal ash, and high thermal stability and excellent thermal storage performance are realized. Environmental pollution is reduced due to waste recycling of the coal ash, and the composite phase-change thermal storage material is hopefully and practically applied to fields of building thermal insulation materials, solar energy utilization and the like.

Description

technical field [0001] The invention relates to a fly ash-based composite phase-change heat storage material and a preparation method thereof, belonging to the technical field of energy storage materials. Background technique [0002] Energy is the foundation of human survival and development. The energy crisis and environmental deterioration brought about by the fossil fuel-based energy supply system have attracted much attention. The development and utilization of renewable energy, energy conservation and emission reduction, and improvement of energy utilization have become the focus of all countries in the world to alleviate the contradiction between energy supply and demand and reduce environmental pollution. It is an important way to pollute, adjust the energy structure and change the mode of economic growth. Among the renewable energy sources such as solar energy, wind energy, biomass, and tidal energy, solar energy has become the most important renewable energy due t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 汪逸凡王之霖史玉兰
Owner 汪逸凡
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