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Preparation method of sizing composite heat storage material for moderate-high temperature

A technology of thermal storage materials and composite phase change materials, which is applied in the field of preparation of composite thermal storage materials for medium and high temperature in shaping, can solve the problems of easy leakage, high price, leakage, etc., and achieve high thermal storage density, good thermal conductivity, and easy deformation effect

Active Publication Date: 2016-06-15
SUZHOU PORCELAIN INSULATOR WORKS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Document 4 (A.A.Jalalzadeh-azar, M.G.Steele, and G.A.Adebiyia.Performancecomparisonofhigh-temperaturepackedbedoperationwithPCMandsensible-heatpellets[J].EngeryRes.1997(21):1039-1052.) prepared Na 2 SO 4 / SiO 2 Composite heat storage material, the heat storage material has poor cycle stability
[0005] Applied patents on thermal storage materials, such as document 5 (CN201110020197.1) disclose a calcium chloride hexahydrate phase-change energy storage material composition and a preparation method thereof. The thermal storage material prepared by this method is inconvenient to use and has no Solve the problems of low thermal conductivity and easy leakage
Document 6 (Ross; RandyUSpatent.No.5685151) reports a kind of thermal storage material that is used for solar energy, and the main component of this material is sodium chloride, and its dress container is special stainless steel material, and is expensive
Document 7 (CN201210018441.5) discloses a high-temperature composite phase-change heat storage material and its preparation method. The material is prepared by co-firing with inorganic salt, ceramic base and high thermal conductivity material. The preparation process of this method is simple and the thermal conductivity is good. , but prone to leakage

Method used

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  • Preparation method of sizing composite heat storage material for moderate-high temperature
  • Preparation method of sizing composite heat storage material for moderate-high temperature

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Embodiment 1

[0028] This embodiment provides a method for preparing a composite heat storage material for medium and high temperature, including the following steps:

[0029] 1) Treat the vermiculite at a temperature of 1300°C for 20 minutes, and mix it with the phase-change material at a mass ratio of 1:10 after cooling. The phase-change material is composed of 40.0wt% MgCl 2 , 30.4wt% KCl and 29.6wt% NaCl composition;

[0030] 2) The above mixture was kept at 400°C for 6 hours under the condition of a negative pressure of -15kPa to prepare a composite phase change material, then mechanically crush the composite phase change material to 40 mesh, add modified carbon fiber and then mechanically mix for 24 hours. Modified carbon fiber accounts for 2% of the total mass of the composite phase change material;

[0031] 3) Adding a high-temperature binder dropwise, pressing and molding under a pressure of 10 MPa, and finally curing at a temperature of 300° C. for 30 minutes to obtain the compos...

Embodiment 2

[0043] This embodiment is roughly the same as Embodiment 1, except that the modified carbon fiber accounts for 4% of the total mass of the composite phase change material.

[0044] After testing: the thermal storage density of the thermal storage material is 285.6J / g, and the thermal conductivity measured by the thermal conductivity meter is 1.86W / (m·K). After 200 cycles of solidification and melting at a temperature of 450°C, the composite heat storage material has no damage in appearance, and its mass has decreased by 1.3%. After 500 cycles, the appearance of the heat storage material has no damage, and its mass has decreased by 1.3%. It shows that the shaped heat storage material prepared in this example is not easy to leak.

Embodiment 3

[0046] This embodiment is roughly the same as Embodiment 1, except that the modified carbon fiber accounts for 8% of the total mass of the composite phase change material.

[0047] After testing: the thermal storage density of the thermal storage material is 264.1J / g, and the thermal conductivity measured by the thermal conductivity meter is 2.52W / (m·K). After 200 cycles of solidification and melting at a temperature of 450°C, the composite thermal storage material has no damage in appearance and a mass reduction of 1.2%. After 500 cycles, the thermal storage material has no damage in appearance and a mass reduction of 1.2%. It shows that the shaped heat storage material prepared in this example is not easy to leak.

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Abstract

The invention discloses a preparation method of a sizing composite heat storage material for moderate-high temperature, comprising the following steps: treating vermiculite under the temperature of 1300 DEG C for 20min, cooling, and mixing with phase change materials according to a mass ratio of 1 to 10, wherein the phase change materials consist of MgCl2, KCl and NaCl, and the sum of the phase change materials is 100 percent; preserving the heat of the mixture for 6h under the conditions of 400 DEG C and negative pressure of -15kPa, preparing a composite phase change material, mechanically crushing the composite phase change material into 40 meshes, adding modified carbon fiber, and then mechanically mixing for 24h, wherein the mass of the modified carbon fiber accounts for 2-8 percent of the total mass of the composite phase change material; dropwise adding a high temperature binder, performing compression moulding under the pressure of 10-20MPa, and finally preserving heat under the temperature of 300 DEG C for curing, thus obtaining the sizing composite heat storage material for moderate-high temperature. The sizing composite heat storage material is reasonable in material selection, strong in heat conductivity, high in heat storage density and wide in base material source, and the prepared sizing composite heat storage material has better heat stability, little leakage possibility and better application prospect.

Description

technical field [0001] The invention relates to the technical field of energy storage materials, in particular to a method for preparing a composite heat storage material for medium and high temperature after setting. Background technique [0002] The energy used for the development and life of human society mainly comes from non-renewable mineral energy such as coal, oil, and natural gas. During the use, it will cause environmental pollution such as air, water, and air, and bring great harm to the development and life of human society. pressure. Due to technical limitations, building a stable, economical, clean, and safe energy supply system is facing major challenges. In response to the increasingly urgent energy crisis, improving energy utilization efficiency can reduce the consumption of primary energy such as fossils, so it is of great significance. Heat storage technology is a feasible way to improve energy utilization efficiency, which is of great significance to th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/06
CPCC09K5/063
Inventor 周卫兵严婉李儒光朱教群程晓敏
Owner SUZHOU PORCELAIN INSULATOR WORKS
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