A medium-high temperature phase change heat storage material based on coal gangue and its preparation method

A phase change heat storage material and a phase change material technology, which are applied in the field of medium and high temperature phase change heat storage materials and preparation based on coal gangue, can solve the problems of occupying a large amount of land, environmental pollution, waste of resources, etc., and are convenient for transportation and installation. , the effect of alleviating environmental pollution and low cost

Active Publication Date: 2021-02-19
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Coal gangue, as one of the typical industrial solid wastes, occupies a large amount of land and causes environmental pollution and waste of resources due to relatively few areas of use.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The coal gangue-based eutectic carbonate phase change heat storage material was prepared by the following steps:

[0026] (1) Pulverize, grind, and dry coal gangue, and dry sodium carbonate and potassium carbonate at 90°C for 4 hours;

[0027] (2) In terms of mass fraction, weigh 35 parts of coal gangue with powder particle diameter<20 μm respectively after drying in step (1), and 55 parts of eutectic carbonate with particle diameter<80 μm including sodium carbonate and potassium carbonate, fully Grind until well blended;

[0028] (3) Keep the mixed powder obtained in step (2) under the pressure of 20MPa for 30s, press the inner groove of the mold into a cylindrical shape; then sinter: from room temperature to 250°C at a rate of 5°C / min ℃ for 1 hour, then heated up to 400°C at a rate of 5°C / min, then raised to 640°C at a rate of 3°C / min, and finally raised to 750°C at a rate of 5°C / min, kept for 2 hours, and then After cooling, the eutectic carbonate phase change heat...

Embodiment 2

[0031] The coal gangue-based eutectic carbonate phase change heat storage material with the addition of ceramic framework materials was prepared by the following steps:

[0032] (1) Crush, grind, and dry coal gangue, and dry magnesium oxide at 100°C for 4 hours, and dry sodium carbonate and potassium carbonate at 90°C for 4 hours;

[0033] (2) In terms of mass fraction, weigh 35 parts of coal gangue with a particle size of <20 μm after drying in step (1), 10 parts of magnesium oxide with a particle size of <80 μm, and eutectic carbonate with a particle size of <80 μm, including: Totally 55 parts of sodium carbonate and potassium carbonate, fully ground until uniformly mixed;

[0034] (3) Keep the mixed powder obtained in step (2) under the pressure of 20MPa for 30s, press the inner groove of the mold into a cylindrical shape; then sinter: from room temperature to 250°C at a rate of 5°C / min ℃ for 1 hour, then heated up to 400°C at a rate of 5°C / min, then raised to 640°C at a r...

Embodiment 3

[0037] The coal gangue-based eutectic carbonate phase change heat storage material with the addition of ceramic framework materials and modified materials was prepared by the following steps:

[0038] (1) Pulverize, grind, and dry coal gangue, and dry magnesium oxide and clay at 100°C for 4 hours, and dry the eutectic salt composed of sodium carbonate and potassium carbonate at 90°C for 4 hours;

[0039](2) In terms of mass fraction, weigh 25 parts of coal gangue with a particle size of <20 μm after drying in step (1), 10 parts of magnesium oxide with a particle size of <80 μm, 10 parts of clay, and eutectic carbon with a particle size of <80 μm Acid salts include 55 parts of sodium carbonate and potassium carbonate, fully grind until uniformly mixed, and age for 8 hours;

[0040] (3) Keep the mixed powder obtained in step (2) under the pressure of 30MPa for 30s, press the inner groove of the mold into a cylindrical shape; ℃ for 1 hour, then heated up to 400°C at a rate of 5°...

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Abstract

The invention discloses a gangue based medium and high temperature phase change heat storage material and a preparation method in the technical field of energy sources and novel heat storage and energy saving materials. The phase change heat storage material comprises 10-60wt% of phase change material and the balance of gangue; a ceramic framework material and / or a modified material can also be added to increase a use temperature and improve rigidity and moldability of the phase change material; the gangue based medium and high temperature phase change heat storage material prepared after grinding, mixing, pressure molding and sintering is high in package compactness, wide in use temperature scope, low in corrosion, safe and reliable, low in cost and long in service life; a preparation technology is simple, low in cost and easy in industrial popularization; at the same time, the environmental pollution problem of gangue is alleviated; and the reclamation utilization of the gangue is achieved.

Description

technical field [0001] The invention belongs to the technical field of energy and heat storage and energy-saving new materials, in particular to a medium-high temperature phase-change heat storage material based on coal gangue and a preparation method thereof. Background technique [0002] The vast majority of energy in human activities is converted and utilized in the form and link of thermal energy. In my country, the conversion and utilization ratio of thermal energy is as high as 90%. With the development of society and the continuous improvement of energy utilization technology, heat storage technology plays an increasingly important role in people's production and life, especially at the centralized supply and user ends of energy. [0003] Generally speaking, heat storage includes sensible heat storage and latent heat storage. The former is the most widely used heat storage method at present, but the heat storage density is small; phase change heat storage is a high-te...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 李宝让刘钰邓占峰
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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