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.
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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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