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Method for preparing ceramic thermal storage ball coating phase-change materials

A phase change material, ceramic ball technology, applied in heat storage equipment, lighting and heating equipment, indirect heat exchangers, etc., can solve the problems of high manufacturing cost, easy volatility, poor metal corrosion resistance and high temperature resistance, etc. Effects of low manufacturing cost, high heat storage capacity, and high thermal conductivity

Inactive Publication Date: 2010-07-28
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Various types and preparation methods of heat storage materials have appeared in recent years, but there are some shortcomings and deficiencies, and it is difficult to meet the needs of solar thermal power generation heat storage systems
Such as "Preparation Method of Metal Matrix Composite Molten Salt Thermal Storage Material" (Wang Hua. Chinese Invention Patent CN1141355C), the method is to immerse molten salt in the porous metal matrix material, and then deposit a protective film on the surface, but the metal Corrosion resistance and high temperature resistance are poor, and it is difficult to meet the high temperature conditions of 800 ℃ ~ 1200 ℃ for solar thermal power generation heat storage systems; .Chinese invention patent CN1803965A) The method is to prepare a ceramic matrix with three-dimensional interconnected holes, and then immerse the molten inorganic salt into the ceramic matrix under high temperature conditions. This method can be used at about 1000 ° C, and the energy storage density Between 227.17 and 245.43kJ / kg, but the disadvantage is that the molten salt is still exposed and easily volatilized, which affects its use effect; "Development of PCM for Recovering High Temperature Waste Heat and Utilization for Producing Hydrogen by Reforming Reaction of Methane" (Kazushi SATO, Jun-ichiro YAG.International, Vol.42(2002), No.2.215~219) proposed a phase change material with copper, and a layer of nickel was electroplated on its surface as a protective layer. The thermal storage material prepared by this method can Used under the condition of 1200 ℃, nickel is used as the protective layer to have a certain corrosion resistance, but this method has high manufacturing costs and is not suitable for use in large-scale solar thermal power generation heat storage systems

Method used

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  • Method for preparing ceramic thermal storage ball coating phase-change materials
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Examples

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Embodiment 1

[0028] A method for preparing a ceramic heat storage ball wrapped with a phase change material, comprising the following steps:

[0029] 1) Preparation of SiC ceramic spherical shell:

[0030] ①Crush SiC and feldspar separately [crushing with a jaw crusher, and then passing through a roller crusher for rollers], then ball milling with a ball mill for 4 hours, passing through a 200-mesh sieve to obtain SiC powder and feldspar powder for later use;

[0031] According to the percentage by weight of each raw material: SiC powder 80%, feldspar powder 8%, kaolin 12%, select SiC powder, feldspar powder and kaolin;

[0032] Put SiC powder, feldspar powder and kaolin into a ball mill and mix for 1 hour to obtain mixture A; add water and polyvinyl alcohol solution to mixture A, and mix with a kneader for 20 minutes to make mud; the amount of water added is 16% of A weight, the add-on of polyvinyl alcohol solution is 6% of compound A weight, wherein the concentration of polyvinyl alcoho...

Embodiment 2

[0052] A method for preparing a ceramic heat storage ball wrapped with a phase change material, comprising the following steps:

[0053] 1) Preparation of SiC ceramic spherical shell:

[0054] ①Crush SiC and feldspar separately [crushing with a jaw crusher, and then passing through a roller crusher for rollers], then ball milling with a ball mill for 4 hours, passing through a 200-mesh sieve to obtain SiC powder and feldspar powder for later use;

[0055] According to the percentage by weight of each raw material: SiC powder 75%, feldspar powder 10%, kaolin 15%, select SiC powder, feldspar powder and kaolin;

[0056] Put SiC powder, feldspar powder and kaolin into a ball mill and mix for 1 hour to obtain mixture A; add water and polyvinyl alcohol solution to mixture A, and mix with a kneader for 20 minutes to make mud; the amount of water added is 15% of A weight, the add-on of polyvinyl alcohol solution is 5% of compound A weight, wherein the concentration of polyvinyl alcoh...

Embodiment 3

[0069] A method for preparing a ceramic heat storage ball wrapped with a phase change material, comprising the following steps:

[0070] 1) Preparation of SiC ceramic spherical shell:

[0071] ①Crush SiC and feldspar separately [crushing with a jaw crusher, and then passing through a roller crusher for rollers], then ball milling with a ball mill for 4 hours, passing through a 200-mesh sieve to obtain SiC powder and feldspar powder for later use;

[0072] According to the percentage by weight of each raw material: SiC powder 85%, feldspar powder 5%, kaolin 10%, select SiC powder, feldspar powder and kaolin;

[0073] Put SiC powder, feldspar powder and kaolin into a ball mill and mix for 1 hour to obtain mixture A; add water and polyvinyl alcohol solution to mixture A, and mix with a kneader for 20 minutes to make mud; the amount of water added is 18% of A weight, the add-on of polyvinyl alcohol solution is 8% of compound A weight, wherein the concentration of polyvinyl alcoho...

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Abstract

The invention relates to a method for preparing ceramic thermal storage ball coating phase-change materials. The method is characterized by comprising the following steps: 1) preparing a SiC ceramic spherical shell: a. breaking and ball milling SiC and feldspar to obtain SiC powder and feldspar powder; the raw materials have the following percentage by weight: SiC powder: 75-85%, feldspar powder: 5-10%, kaolin: 10-15%; selecting and ball milling the raw materials to obtain a mixture A; adding water and polyving alcohol solution into the mixture A to prepare pug; b. forming the spherical shell to obtain plastic green body of the spherical shell; c. drying; d. sintering; 2) preparing encapsulation agent pug, the raw materials have the following percentage by weight: SiC powder: 10-20%, low temperature fusion cake: 80-90%; selecting and ball milling the raw materials; adding polyving alcohol solution to the mixture to prepare encapsulation agent pug: 3) encapsulating the encapsulation agent pug to obtain a ceramic thermal storage ball coating phase-change materials. The invention has the characteristics of high heat storage capacity, high thermal conductivity, thermostability, corrosion resistance and low cost.

Description

technical field [0001] The invention belongs to the field of new energy materials and energy-saving new materials, and specifically relates to a preparation method of ceramic heat storage balls wrapped with phase change materials, which are mainly applied to solar thermal power generation heat storage systems using air as a heat transfer medium. Background technique [0002] Solar thermal power generation technology is recognized as one of the most promising power generation methods in renewable energy power generation. It is a relatively mature power generation technology with low power generation cost and little impact on the power grid. It is most likely to compete with wind power, hydropower and fossil Fuel generation is economically competitive. Solar thermal power generation systems generally rely on the heat storage system to work. The output of the heat accumulator is the input of the generator set. The heat storage parameters have a great influence on the system ope...

Claims

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Application Information

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IPC IPC(8): F28D20/00C04B35/565
CPCY02E60/142Y02E60/14
Inventor 吴建锋冷光辉徐晓虹李剑饶郑刚徐瑜成昊
Owner WUHAN UNIV OF TECH
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