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Composites for storing thermal energy at high temperatures

A composite material, heat storage technology, applied in heat exchange materials, nanotechnology for materials and surface science, applications, etc., can solve various problems, achieve high thermal conductivity, improve heat transfer, charge/discharge time Reduced effect

Inactive Publication Date: 2015-08-12
ABENGOA SOLAR NEW TECH SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Subcooling is often a disadvantage in thermal energy storage applications because it requires different operating temperatures for charging and discharging

Method used

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  • Composites for storing thermal energy at high temperatures
  • Composites for storing thermal energy at high temperatures
  • Composites for storing thermal energy at high temperatures

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Experimental program
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Embodiment Construction

[0051] In order to give a better understanding of the invention, below we describe the composite material described, and its function in different states.

[0052] The carbon / salt composite consists of a porous carbon structure at least partially filled with LiOH / KOH.

[0053] The porous structure can be filled with molten LiOH / KOH by vacuum intrusion, or using other industrial processes, such as by condensation of LiOH / KOH vapor, or using a gas flow with suspended LiOH / KOH small solid particles.

[0054] figure 1 The phase diagram of the LiOH / KOH binary system is provided, and it can be seen from the diagram that the most notable properties of the composite material are obtained, namely:

[0055] They make it possible to cover a wide range of applications. Such as figure 1 As shown, the molar concentrations of LiOH are equal to 0, 0.264, 0.314, 0.67 and 1, making the melting points of the mixtures at 404 °C, 249 °C, 225 °C, 315 °C and 477 °C, respectively. Therefore, th...

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Abstract

Composite material for storing heat energy at high temperatures (225°C to 488°C) formed by a porous carbon structure at least partially filled with LiOH / KOH, wherein a large amount of heat energy may be stored or released very quickly. The carbon structure is characterised by a high volumetric thermal conductivity, a low density, a highly interconnected porosity and a relatively high modulus of elasticity. The significant properties of LiOH / KOH mixtures are: a large amount of energy involved in full melting / crystallisation, a fairly low relative volume expansion upon melting and fairly low subcooling. The main advantages of the resulting composites are a very high energy density, a relatively low volume expansion, highly enhanced heat transfer, thermoadaptability, stability and insignificant hysteresis.

Description

technical field [0001] The present invention relates to a new phase change material for storing thermal energy at high temperature (>200°C). They are the product of filling a porous carbon structure with a phase-change material with high energy density. The role of the phase change material is to store or release thermal energy within a selected temperature range, and the carbon in it is used to enhance heat transfer. Background technique [0002] Currently, there are many applications that require the storage of large amounts of heat at high temperatures. In the industrial sector, the recovery, storage and reuse of waste heat play an important role in the efficient and economical use of energy. [0003] In energy generation based on conventional conversion technologies (i.e. gas-fired or oil-fired power plants), the storage of heat will be an efficient way to improve its efficiency and recovery, as well as to reduce the nominal energy required to adjust to peak loads. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/02C01B31/02C04B35/52C04B41/81
CPCC04B41/85B82Y30/00C04B35/522C04B2235/44C04B2235/3203C04B41/5072C04B2235/5288C09K5/063C04B2235/616C04B2235/3201C04B35/524C04B41/009C04B35/83C04B35/52C04B38/00C04B41/4529C04B2103/0071C04B41/4545
Inventor E·帕罗莫 雷 巴里诺S·本 黑密斯D·莫兰德F·诺埃尔V·何康典J-L·奥弗涅Y·安古C·普列托 里奥斯A·朱庇特 略韦拉
Owner ABENGOA SOLAR NEW TECH SA