Prepn of heat accumulating for solar energy medium temperature steam electricity generation

A heat storage material and solar energy technology, which is applied in the field of preparation of heat storage materials for mid-temperature steam power generation of solar energy, can solve the problems of high cost and can only be used at low temperature.

Inactive Publication Date: 2007-01-03
HUBEI KAIJIA ELECTRICAL TECH GROUP
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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

[0012] The weight ratio and particle size of raw materials are: basalt aggregate 38%, particle size 10-30mm; steel slag aggregate 32%, particle size 1-10mm; 500 mesh aluminate cement 8%; 500 mesh slag powder 15%; 500 mesh silicon Micro powder 5%; attapulgite 2%, particle size 100-500nm; plus superplasticizer 0.3%.

[0013] The slag powder in this example and the following examples can be industrial waste slag, which is dried and ground to 500 mesh, and then added to the material. It not only improves the fluidity of the mixed material, but also greatly contributes to the later strength of the prepared material.

[0014] After the raw materials are dry-mixed evenly, add 6% water, mix them evenly and put them in the steel mold, demould after 24 hours, cure in water at 20-25°C for 72 hours, then bake at 100-120°C Bake for 24 hours. The density of heat storage material is 2.98g / cm 3 , measured on the INSTRON-11950,000 energy testing machine, the compressive strength of the mate...

Embodiment 2

[0016] The weight ratio and particle size of raw materials are: basalt aggregate 35%, particle size 10-30mm; copper slag aggregate 35%, particle size 1-10mm; 500 mesh aluminate cement 6%; 500 mesh slag powder 17%; 500 mesh Silica powder 4%; attapulgite 3%, particle size 100-500nm; plus superplasticizer 0.3%.

[0017] After the raw materials are mixed evenly with the ingredients, add 5.5% water, mix them evenly and put them in the steel mold. After 24 hours, they will be demoulded. Bake for 24 hours. The density of heat storage material is 2.96g / cm 3 , measured on the INSTRON-1195 million mechanical testing machine, the compressive strength of the material is ≥60MPa, the flexural strength σb≥12MPa, and the volumetric heat capacity is 148kWh / m 3 , thermal conductivity 1.77W / mK, refractoriness 1000℃.

Embodiment 3

[0019] The weight ratio and particle size of raw materials are: basalt aggregate 25%, particle size 10-30mm; steel slag aggregate 38%, particle size 1-10mm; 500 mesh aluminate cement 10%; 500 mesh slag powder 20%; 500 mesh silicon Micro powder 5%; attapulgite 2%, particle size 100-500nm; superplasticizer 0.3%.

[0020] After the raw materials are dry-mixed evenly, add 6% water, mix them evenly and put them in the steel mold, demould after 24 hours, cure in water at 20-25°C for 72 hours, then bake at 100-120°C Bake for 24 hours. The density of heat storage material is 2.98g / cm 3 , measured on the INSTRON-11950,000 energy testing machine, the compressive strength of the material is ≥50MPa, the flexural strength is ≥8MPa, and the volumetric heat capacity measured on the comprehensive thermal analyzer is 145kWh / m 3 , The thermal conductivity measured by the thermal conductivity meter is 1.75W / mK, and the refractoriness is 1000°C.

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Abstract

The present invention is the preparation process of heat accumulating material for solar energy medium temperature steam electric power generation. The heat accumulating material is prepared with basalt and steel slag or copper slag as aggregate, fine silica powder, mineral slag powder, aluminate cement and nanometer level attapulgite, and through mixing while adding water, molding, demolding, curing in water for 72 hr and stoving at 100-120 deg.c for 24 hr. The heat accumulating material has high heat storing efficiency and heat releasing efficiency, and the preparation process can reduce industrial slag pollution.

Description

technical field [0001] The invention relates to the preparation of a heat storage material, in particular to a preparation method of a heat storage material for solar medium-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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/14F03G6/06
CPCY02E10/46Y02P80/20
Inventor 朱教群周卫兵吴少鹏李波王金山张炳汤凯周明杰
Owner HUBEI KAIJIA ELECTRICAL TECH GROUP
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