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High-temperature composite phase change heat storage material and preparation method thereof

A technology for composite phase change and heat storage materials, applied in the field of high temperature composite phase change heat storage materials and their preparation, can solve the problems of complex process, poor cycle stability, cumbersome process and the like

Active Publication Date: 2012-07-18
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Such as using the melt infiltration method (A.A.Jalalzadeh-azar, W.G. Steele, and G.A.Adebiyia, Performance comparison of high-temperature packed bed operation with PCM and sensible-heat pellets.Int.J.Engery Res., 21(1997)1039- 1052), but the method Na 2 SO 4 / SiO 2 The cycle stability is poor, and the method process Na 2 SO 4 in SiO 2 low infiltration
Compared with this method, there is also a liquid phase method to prepare amorphized Ge0.8Sn0.2 nanoclusters, and then the silicon source is used to generate SiO 2 Coating nanoclusters, and finally preparing nanoscale highly dispersed Ge 0.8 sn 0.2 / SiO 2 High temperature heat storage phase change materials (S.J.Shin, J.Guzman, C.W.Yuan, et al.Embedded binary eutectic alloy nanostructures: A new class of phase change materials. Nano Lett., 10(2010) 2794-2798), but the method The process is cumbersome and the process is complicated
[0006] Therefore, the difficulty of the prior art lies in the low thermal conductivity of phase change heat storage materials, slow heat storage / release rate, poor cycle stability, and complicated preparation methods, which are not conducive to industrial production

Method used

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  • High-temperature composite phase change heat storage material and preparation method thereof
  • High-temperature composite phase change heat storage material and preparation method thereof
  • High-temperature composite phase change heat storage material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Pre-heat the carbon nanotubes at 800°C for 20 minutes; mix and grind 6 grams of sodium carbonate and 9 grams of magnesium oxide to prepare 15 grams of inorganic salt / ceramic matrix binary mixture, and then add 1 mg of pretreated carbon nanotubes, mixed and ground for 30 minutes to make a ternary mixture of inorganic salt / ceramic matrix / carbon nanotubes; weigh 3.0 g of the ternary mixture and add it to a steel mold In the process, the molding pressure on the hydraulic press is 10MPa, and the pressure holding time is 10min. After demoulding, take out the pressed sample and put it into a graphite crucible. Under the condition of 30mL / min nitrogen gas, the heating rate is 10℃ / min, and the temperature is raised to 900 ℃, after 1 hour of heat preservation, the temperature was lowered at a cooling rate of 10 ℃ / min, and the temperature was lowered to 50 ℃. The final product is Na 2 CO 3 -MgO-CNTs heat storage material, the yield is above 97%. The results of scanning electro...

Embodiment 2

[0058] Pre-heat the carbon nanotubes at 500°C for 60 minutes; mix and grind 10 grams of sodium carbonate and 10 grams of magnesium oxide to prepare 20 grams of inorganic salt / ceramic matrix binary mixture, and then add 50 mg of pretreated carbon nanotubes, mixed and ground for 40 minutes to make a ternary mixture of inorganic salt / ceramic matrix / carbon nanotubes; weigh 4.5g of the ternary mixture and add it to a steel mold In the process, the molding pressure on the hydraulic press is 15MPa, and the holding time is 6min. After demoulding, take out the pressed sample and put it into a graphite crucible. Under the condition of 20mL / min nitrogen gas, the heating rate is 5℃ / min, and the temperature is raised to 800 ℃, after 2 hours of heat preservation, the temperature was lowered at a cooling rate of 5 ℃ / min, and the temperature was lowered to 50 ℃. The final product is Na 2 CO 3 -MgO-CNTs heat storage material, the yield is above 97%. The results of scanning electron microsc...

Embodiment 3

[0060] The carbon nanotubes were pre-heated at 700°C for 40 minutes; 18 grams of sodium carbonate and 12 grams of magnesium oxide were mixed and ground evenly to prepare 30 grams of inorganic salt / ceramic matrix binary mixture, and then 15 mg of pretreated carbon nanotubes, mixed and ground for 60 minutes to make a ternary mixture of inorganic salt / ceramic matrix / carbon nanotubes; weigh 6.0 g of the ternary mixture and add it to a steel mold In the process, the molding pressure on the hydraulic press is 20MPa, and the holding time is 2min. After demolding, the pressed sample is placed into a graphite crucible, and under the condition of 10mL / min nitrogen gas, the heating rate is 20℃ / min, and the temperature is raised to 750 ℃, after 3 hours of heat preservation, the temperature was lowered at a cooling rate of 20 ℃ / min, and the temperature was lowered to 40 ℃. The final product is Na 2 CO 3 -MgO-CNTs heat storage material, the yield is above 97%. The results of scanning elec...

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Abstract

The invention relates to a preparation method of a high-temperature composite phase change heat storage material, and relates to a high-temperature composite phase change heat storage material and a preparation method thereof. The method can be used for preparing high-temperature composite phase change heat storage material with high heat conductivity, so that the heat conductivity of the heat storage material is greatly improved, and the heat storage / release rate is greatly improved; and the preparation method is easy to control and simple to operate. The heat storage material can be directly obtained by sintering, without need of any bonding agent or other protectants, so that the heat-conducting property of the heat storage material is greatly improved, and the utilization ratio of the heat storage material is improved; the preparation method is simple to operate; and the prepared product can also be used for other intermediate-temperature low-temperature composite heat storage materials, as well as light heat utilization, heat-cold-electricity combined use, composite material synthesis and other many fields.

Description

technical field [0001] The invention relates to the technical field of producing heat storage materials by chemical and chemical methods and the field of energy material science. Specifically, the invention relates to a high-temperature composite phase change heat storage material based on inorganic salts, a preparation method and its application. Background technique [0002] Energy storage research is a strategic issue for energy security and sustainable development, in which thermal energy storage and utilization are closely related to the national economy and people's livelihood. Heat storage technology, especially phase change heat storage technology, is an important technology to rationally and effectively utilize existing energy, optimize the use of renewable energy and improve energy utilization efficiency. It has been a very active research direction in the field of energy conservation in the world in the past 20 years. [0003] With the mutual penetration and rapid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
Inventor 叶锋葛志伟丁玉龙金翼仲俊瑜王彩霞
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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