Preparation method of blast furnace slag-based composite phase-change heat storage material

A composite phase change and heat storage material technology, applied in the field of heat storage material preparation, can solve the problems of easy loss of phase change materials, poor thermal stability, low phase change temperature, etc., and achieve phase change temperature and latent heat stability, high temperature stability good, mild effect

Active Publication Date: 2017-08-29
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the defects of low phase transition temperature, poor thermal stability, and easy loss of phase change materials in the composite phase change materials in the prior art, the purpose of the present invention is to provide a high phase transition temperature, good thermal stability, A method for preparing a composite phase change heat storage material with no leakage during the process and having a stable shape, the preparation process is simple and the cost of raw materials is low

Method used

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  • Preparation method of blast furnace slag-based composite phase-change heat storage material
  • Preparation method of blast furnace slag-based composite phase-change heat storage material

Examples

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Effect test

Embodiment 1

[0029] Combine blast furnace slag with Ca(OH) 2 For batching, where Ca(OH) 2 5% of the mass of blast furnace slag, the ball milling time is 20min, and the pretreated blast furnace slag and phase change material NaNO after drying 3 And the total amount of raw materials 1% sodium humate modified bentonite mixed grinding, compaction, drying, of which NaNO 3The mass ratio of blast furnace slag to blast furnace slag is 2:3, and the molding pressure is 50 MPa. The dried green body is placed in a muffle furnace and roasted at 350°C for 120 minutes in an air atmosphere to obtain a blast furnace slag-based composite phase change heat storage material. Macroscopically, it can be seen that the product under this condition has a stable shape, no cracks on the surface and no leakage of phase change materials. DSC analysis shows that the phase change temperature of the composite phase change heat storage material is 300.5°C, and the latent heat of phase change is 68.49J / g. After 50 After ...

Embodiment 2

[0031] Put the blast furnace slag of the same weight as in Example 1 into the ball mill separately, and the ball milling time is 20min. After drying, the blast furnace slag and the phase change material NaNO 3 And the total amount of raw materials 1% sodium humate modified bentonite mixed grinding, compaction, drying, of which NaNO 3 The mass ratio of blast furnace slag to blast furnace slag is 2:3, and the molding pressure is 50 MPa. The dried green body is placed in a muffle furnace and roasted at 350°C for 120 minutes in an air atmosphere to obtain a blast furnace slag-based composite phase change heat storage material. Macroscopically, it can be seen that the product under this condition has no cracks on the surface and has a stable shape. According to the DSC analysis, the phase change temperature of the composite phase change heat storage material is 300.8°C, and the phase change latent heat is 65.53J / g, which has a relatively high phase change latent heat. , but compare...

Embodiment 3

[0036] Combine blast furnace slag with Ca(OH) 2 Row ingredients, where Ca(OH) 2 The addition amount is 5% of the blast furnace slag, and the ball milling time is 40min. After drying, the pretreated blast furnace slag and the phase change material NaNO 3 And the total amount of raw materials 2% sodium humate modified bentonite mixed grinding, compaction, drying, of which NaNO 3 The mass ratio of blast furnace slag to blast furnace slag is 1:9, and the pressure is 20 MPa. The dried green body is placed in a muffle furnace and roasted at 400°C for 60 minutes in an air atmosphere to obtain a blast furnace slag-based composite phase change heat storage material. Macroscopically, it can be seen that the product with this condition has a stable shape, no cracks on the surface and no leakage of phase change materials. DSC analysis shows that the phase change temperature of the composite phase change heat storage material is 300.9°C, the latent heat of phase change is 18.10J / g, NaNO ...

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Abstract

The invention discloses a preparation method of a blast furnace slag-based composite phase-change heat storage material. The preparation method comprises the following steps: performing ball-milling pretreatment to a blast furnace slag raw material, uniformly mixing with an inorganic salt phase-change material and an adhesive, and pressing into a blank; sintering the blank in an air atmosphere to obtain the blast furnace slag-based composite phase-change heat storage material. The blast furnace slag has an excellent porous characteristic and can sufficiently adsorb the phase-change material, so that the formed composite phase-change heat storage material is uniform in appearance and stable in shape, does not seep out the phase-change material in the phase change process and can maintain the original outer shape; after multiple thermal cycles, the composite phase-change heat storage material still has good thermal stability, phase change latent heat and phase change temperature stability; the working temperature range of the composite phase-change heat storage material can be extended to a temperature of 300-850 DEG C according to different types of phase-change materials.

Description

technical field [0001] The invention relates to a phase change heat storage material, in particular to a method for preparing a composite phase change heat storage material by using blast furnace slag as a carrier material, and belongs to the field of heat storage material preparation. Background technique [0002] Energy is the key to the survival and development of human society. In recent years, with the extensive use of oil and coal resources in my country, environmental problems have become increasingly serious and the greenhouse effect has intensified. Facing the increasingly severe energy crisis, it is particularly important to improve energy utilization efficiency and vigorously develop and utilize renewable energy. However, the intermittent supply of industrial waste heat and renewable energy such as solar (thermal) energy causes the problem of time and space mismatch in utilization, which seriously limits its development and application. [0003] Thermal Energy St...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
Inventor 张元波姜涛刘继成苏子键李光辉彭志伟饶明军黄柱成范晓慧刘兵兵路漫漫陈迎明欧阳学臻韩本来王娟
Owner CENT SOUTH UNIV
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