Preparation method of high temperature heat storage material

A heat storage material, high temperature technology, applied in the direction of heat exchange materials, chemical instruments and methods, mechanical equipment, etc., can solve the problems of high cost and can only be used at low temperature, so as to improve strength and reduce mixing water consumption. , Excellent endothermic effect

Inactive Publication Date: 2008-10-22
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the heat storage materials reported in the above literature are either too expensive or can only be used at low temperatures. As a heat storage material for solar energy, it is necessary to consider its performance under the premise of low cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The weight ratio and particle size of raw materials are: 37% basalt aggregate, particle size 10-30mm; 33% bauxite aggregate, particle size 1-10mm; 8% 500 mesh aluminate cement; 5% 500 mesh activated alumina powder ; 500 mesh kyanite 7%; 500 mesh silicon powder 5%; 800 mesh natural graphite 5%; plus 0.3% high-efficiency composite water reducer.

[0016] After the above raw materials are dry-mixed evenly, add 5% water, mix evenly, place in the steel mold, demould after 24 hours, maintain in water at a temperature of 20-25°C for 72 hours, and then dry it at a temperature of 100-120°C Bake for 24 hours. The density of heat storage material is 2.88g / cm 3 , measured on the INSTRON-11950,000 energy testing machine, the compressive strength of the material is ≥60MPa, the flexural strength is ≥10MPa, and the volumetric heat capacity measured on the comprehensive thermal analyzer is 125kWh / m 3 , The thermal conductivity measured by the thermal conductivity meter is 1.88W / mK, an...

Embodiment 2

[0018] The weight ratio and particle size of raw materials are: basalt aggregate 35%, particle size 10-30mm; bauxite aggregate 35%, particle size 1-10mm; 500 mesh aluminate cement 6%; 500 mesh activated alumina powder 4% ; 500 mesh kyanite 11%; 500 mesh silicon powder 5%; 800 mesh natural graphite 4%; plus high-efficiency composite water reducing agent 0.5%.

[0019] After the raw materials are mixed evenly with the ingredients, add 5.5% water, mix them evenly, place them in the steel mold, demould after 24 hours, and cure them in water at 20-25°C for 72 hours. Bake for 24 hours. The density of heat storage material is 2.86g / cm 3 , measured on the INSTRON-1195 million mechanical testing machine, the compressive strength of the material is ≥70MPa, and the flexural strength σ b ≥11MPa, volume heat capacity 128kWh / m 3 , thermal conductivity 1.82W / mK, refractoriness: 1590°C. The heat storage material obtained in this example can be used as a heat storage material for solar hig...

Embodiment 3

[0021] The weight ratio and particle size of raw materials are: basalt aggregate 30%, particle size 10-30mm; bauxite aggregate 40%, particle size 1-10mm; 500 mesh aluminate cement 5%; 500 mesh activated alumina powder 8 %; 500 mesh kyanite 9%; 500 mesh silicon powder 3%; 800 mesh natural graphite 5%; plus high-efficiency composite water reducing agent 0.4%.

[0022] After the above raw materials are dry-mixed evenly, add 5% water, mix evenly, place in the steel mold, demould after 24 hours, maintain in water at a temperature of 20-25°C for 72 hours, and then dry it at a temperature of 100-120°C Bake for 24 hours. The density of heat storage material is 2.94g / cm 3 , measured on the INSTRON-1195 million mechanical testing machine, the compressive strength of the material is ≥55MPa, the flexural strength is ≥10MPa, and the volumetric heat capacity is 130kWh / m measured on the comprehensive thermal analyzer 3 , The thermal conductivity measured by the thermal conductivity meter i...

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Abstract

The invention relates to high temperature storage material manufacturing method. It includes selecting material, mixing, and preparing. It includes the following steps: using basalt as coarse aggregate, bauxite as fine aggregate, and aluminate cement as cementation agent; and adopting silicon micro-powder, activated alumina powder, natural graphite powder, and kyanite micro-powder as material; mixing them; adding 4-6% water; putting in steel mould and demoulding after 24 hours; setting in water at 20-25 centigrade degree for 72 hours; and baking at 100-120 centigrade degree for 24 hour. The formed material has high all round properties, and can avoid environmental pollution.

Description

technical field [0001] The invention relates to the field of heat storage materials, in particular to a preparation method of a heat storage material for solar high-temperature steam power generation. Background technique [0002] Heat storage scheme design is an important technology in solar steam power generation. The performance and cost of heat storage materials are one of the main factors that determine the construction and operation costs of large-scale solar power plants. Heat storage materials used in solar power generation should meet the following requirements: heat storage materials should have high energy density; heat storage materials and heat exchange liquids should have good heat conduction; heat storage materials should have good chemical and mechanical stability; The heat storage material has good chemical compatibility with the heat exchanger and the heat exchange liquid; it should be fully reversible during the heat storage and heat release cycle; low cos...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/14F03G7/00
Inventor 朱教群周卫兵吴少鹏李波王金山张炳汤凯周明杰
Owner WUHAN UNIV OF TECH
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