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Preparation method of porous medium composite phase change energy storage particles

A composite phase change, porous media technology, applied in chemical instruments and methods, heat exchange materials, etc., can solve the problems of complex process, high cost, and many wastes, achieve simple process, convenient operation, and overcome easy agglomeration and agglomeration. Effect

Active Publication Date: 2014-03-26
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the commonly used techniques for shaping phase change materials mainly include microcapsule method, porous media adsorption method, etc., among which the microcapsule method includes in-situ polymerization method, complex coacervation method, interface polymerization method, etc. These methods are complicated and costly, and the preparation The process produces a lot of waste, and the capsule wall is mostly made of organic materials, and its surface has a certain degree of hydrophobicity, which is not easy to combine with traditional building materials, resulting in the disadvantages of low matrix strength; the porous medium adsorption method uses the internal cavity of the porous mineral medium at high temperature. , vacuum or normal temperature and pressure conditions to adsorb liquid phase change materials. This method is simple to operate and low in cost, but the retention effect of phase change materials is relatively poor. Residual phase change materials on the mineral surface are likely to cause mutual interaction between mineral particles. Adhesion and agglomeration, and it is not easy to create vacuum conditions in actual production, and it is difficult to realize mass production.

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  • Preparation method of porous medium composite phase change energy storage particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Porous mineral medium composite phase change energy storage particles were prepared by using bentonite and paraffin. Wherein the paraffin phase transition temperature is 25°C, and the specific operations are as follows:

[0023] Melt the paraffin phase change material and preheat the bentonite in an oven at 40°C; mix and stir the two at this temperature, wherein the mass ratio of paraffin to bentonite is 2:1. After stirring evenly, let the two stand at this temperature for 2 hours to form composite phase-change particles; pour the uniformly mixed composite phase-change particles into the inlet of the fluidized bed, and pass cold air into the inlet. The temperature is 20°C, and the flow rate is 0.8 times of the particle suspension speed, so that the composite phase change energy storage particles are blown into the boiling state in the fluidized bed cylinder; after 30 minutes of operation, the discharge port is opened to allow the material to flow out. Through the analy...

Embodiment 2

[0025] Phase change energy storage particles were prepared by using open-pore expanded perlite and lauric acid-capric acid binary phase change materials. The specific operation is as follows:

[0026] Mix lauric acid and capric acid at a molar ratio of 6:4 and melt evenly to prepare a binary phase change material with a phase transition temperature of 28.3°C. The porous medium adopts open-pore expanded perlite. Mix the binary phase change material and the expanded pearl at a mass ratio of 1.8:1 at a temperature of 50°C and fully stir them, and let them stand at this temperature for 2 hours. The phase-change particles are sprayed to make them boil, the air velocity is adjusted to 1.1 times of the particle suspension velocity, the temperature of the cold air is 18°C, and the discharge port is opened after 10 minutes of operation to allow the recombined phase-change particles to flow out. The prepared particles such as figure 1 As shown, using the traditional method to compare...

Embodiment 3

[0028] Composite phase change energy storage particles were prepared by diatomite and lauric acid phase change materials. Among them, the phase transition temperature of lauric acid is 41°C, and the specific operation is as follows:

[0029] Melt lauric acid and mix it with diatomaceous earth at a mass ratio of 2:1, and mix and stir evenly at 80°C. After standing at this temperature for 0.5 hours, pour it into the inlet of the fluidized bed, and pass it into the Cold air, the temperature of the cold air is 11°C, and the flow rate of the cold air is adjusted to 0.6 times of the particle suspension speed, and it runs for 20 minutes. Finally, dry and uniformly dispersed diatomite-based composite phase-change energy storage particles are prepared. The diatomaceous earth-based composite phase-change particles prepared by the same method have larger retention capacity and better performance than the phase-change materials prepared by the traditional method.

[0030] It should be p...

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Abstract

The invention discloses a preparation method of porous medium composite phase change energy storage particles. The preparation method is characterized in that: a porous mineral medium is taken as a carrier, a liquid phase change material is subjected to mixed adsorption, and is injected into a fluidized bed; cold air with a certain flowing speed in the fluidized bed is used for forced convection cooling of uncooled phase change particles, and particle dispersing is realized via impact effect between the air flow and the phase change particles. Internal phase change material holding capacity of the porous medium composite phase change energy storage particles prepared via the preparation method is relatively high; leakage is difficult to be caused under high temperatures; adsorption stability of the porous medium composite phase change energy storage particles is high; particle dispersibility is high; the surfaces of the porous medium composite phase change energy storage particles are dry; and caking is difficult to be caused. The preparation method is simple; technological processes are few; cost is low; batch production of the porous medium composite phase change energy storage particles can be realized; and the preparation method possesses engineering application value on a certain degree.

Description

technical field [0001] The invention relates to the field of composite phase change energy storage materials, in particular to a preparation method of porous medium composite phase change energy storage particles for construction. Background technique [0002] Phase change energy storage material is a new type of building material. It has the characteristics of phase change heat storage and release. It can reduce energy consumption and improve indoor comfort when used in building materials. This excellent characteristic makes it a hot research direction in the field of building materials. [0003] In order to make full use of the performance of phase change materials and prevent them from leaking during phase change, usually phase change materials are not used directly in building materials, but are combined with carriers to form phase change energy storage particles, and then mixed into Into the insulation material matrix to form a composite insulation material. Therefore,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
Inventor 李东旭周全郭红斌李清海
Owner NANJING UNIV OF TECH
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