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Mesoporous-aluminosilicate-based shaping phase change material prepared from fly ash and preparation method thereof

A technology of phase change materials and aluminosilicates, applied in the direction of heat exchange materials, chemical instruments and methods, can solve the problems of fly ash dependence and restrict the development of traditional energy industries, and achieve continuous load, low leakage rate, High heat storage efficiency

Active Publication Date: 2017-05-31
华东理工常熟研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A large amount of fly ash that has not been effectively utilized depends on landfill disposal, which has brought huge environmental pressure to the society and largely restricted the development of traditional energy industries.

Method used

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  • Mesoporous-aluminosilicate-based shaping phase change material prepared from fly ash and preparation method thereof
  • Mesoporous-aluminosilicate-based shaping phase change material prepared from fly ash and preparation method thereof
  • Mesoporous-aluminosilicate-based shaping phase change material prepared from fly ash and preparation method thereof

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preparation example Construction

[0036] Such as figure 1 As shown, a method for preparing an aluminosilicate-based phase change material prepared by fly ash of the present invention comprises steps:

[0037] Step 1): Mix fly ash with one or more of carbonates, hydroxides or oxides of alkali metals or alkaline earth metals, then roast at high temperature, and rapidly cool the roasted products;

[0038] Step 2): Grinding the quenched roasted sample prepared in step 1) and performing solid-liquid reaction with acid solution;

[0039] Step 3): After the solid-liquid reaction is completed, the solid powder obtained by solid-liquid separation is dried to obtain a mesoporous aluminosilicate powder;

[0040] Step 4): Put the mesoporous aluminosilicate powder prepared in step 3) under vacuum conditions, and maintain the same temperature as the phase transition temperature of the supported phase change material, and then fill with excess phase in molten state Change the material, make the mixture, and continue to mai...

Embodiment 1

[0045] Step 1): Sodium carbonate and fly ash are mixed according to the mass ratio of 30:100, then roasted at 870°C for 45 minutes, and the roasted product is quenched;

[0046] Step 2): Grind the quenched roasted sample powder prepared in step 1) and react with 20% HCl acid solution at 25°C for 15 minutes;

[0047]Step 3): After the solid-liquid reaction is completed, the solid powder obtained by solid-liquid separation is dried to obtain a mesoporous aluminosilicate powder with wedge-shaped pores, and the molar ratio of aluminum and silicon in the obtained product is 0.7:1;

[0048] Step 4): The wedge-shaped mesoporous aluminosilicate powder prepared in step 3) was placed under a vacuum condition of 30kPa, and maintained in contact with the loaded phase change materials lauric acid, myristic acid and stearic acid (LA- PA-SA) The eutectic phase transition temperature is 31.76°C at the same temperature, then filled with excess lauric acid in the molten state, the mixture was p...

Embodiment 2

[0052] Mix 1 part of calcium carbonate with 0.5 part of sodium hydroxide, mix the mixture with fly ash at a mass ratio of 50:100, and then roast at 1150°C for 60 minutes to quench the roasted product;

[0053] Step 2): Grind the quenched roasted sample powder prepared in step 1) and react with 20% HCl acid solution at 60°C for 60 minutes;

[0054] Step 3): After the solid-liquid reaction is completed, the solid powder obtained by solid-liquid separation is dried, and the product obtained with a molar ratio of aluminum to silicon of about 4:1 is screened to obtain mesoporous aluminum-silicon with flat-shaped pores Salt powder;

[0055] Step 4): Place the plate-shaped porous mesoporous aluminosilicate powder prepared in step 3) under a vacuum condition of 80kPa, and maintain the eutectic phase transition temperature of lauric acid and myristic acid with the loaded phase change material at 33.62 °C at the same temperature, and then filled with an excess of molten lauric acid and...

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Abstract

The invention belongs to the recycling utilization field of phase change heat storage materials and solid waste, and in particular relates to a mesoporous-aluminosilicate-based shaping phase change material prepared from fly ash and a preparation method thereof. Mesoporous aluminum silicate is used as a carrier of the mesoporous-aluminosilicate-based shaping phase change material, an eutectic phase change material is used as a loading substance, the mesoporous-aluminosilicate-based shaping phase change material is prepared by the following method: 1) mixing the fly ash and additives, then calcining, and quenching the calcined product; 2) performing controlled acid etching; 3) drying solid-liquid separation powder to prepare mesoporous aluminosilicate powder; 4) placing the mesoporous aluminosilicate powder in vacuum conditions, and filling with an excess molten state phase change material to obtain a mixture; 5) performing solid-liquid separation of the mixture to prepare solid powder, cleaning with a solvent, and drying to obtain the mesoporous-aluminosilicate-based shaping phase change material. Channels of the cylindrical or wedge-shaped mesoporous-aluminosilicate-based shaping phase change material prepared by the method are tapered, loading of the phase change material is more continuous, compatibility is increased, and leakage rat is reduced.

Description

technical field [0001] The invention belongs to the field of phase-change heat storage materials and the field of solid waste recycling and utilization, and specifically relates to a mesoporous aluminosilicate-based shaped phase-change material prepared by using fly ash and a preparation method thereof. Background technique [0002] The fixed phase change material is a composite material that does not change in volume during the phase change process obtained by loading the phase change material into a porous carrier. The shaped phase change material can disperse the phase change material into many independent energy storage units to improve thermal conductivity, and the capillary tension formed by the small pores of the carrier can avoid the leakage of the phase change material. Stereotyped phase change materials can solve the imbalance of energy supply and demand in the distribution of space and time and have great potential to improve energy utilization, so they have becom...

Claims

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Application Information

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IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 乔秀臣李辰晨
Owner 华东理工常熟研究院有限公司
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