Research Papers

Recycled Material for Sensible Heat Based Thermal Energy Storage to be Used in Concentrated Solar Thermal Power Plants

[+] Author and Article Information
Xavier Py1

Nicolas Calvet, Régis Olives, Antoine Meffre

PROMES CNRS UPR-8521,  University of Perpignan, Rambla de la Thermodynamique, Tecnosud, 66100 Perpignan, France

Patrick Echegut, Catherine Bessada, Emmanuel Veron, Sandra Ory

CEMHTI CNRS UPR-3079,  Université d’Orléans, 1D avenue de la Recherche Scientifique, 45071 Orléans cedex 2, France


Corresponding author.

J. Sol. Energy Eng 133(3), 031008 (Jul 25, 2011) (8 pages) doi:10.1115/1.4004267 History: Received January 03, 2011; Revised May 19, 2011; Published July 25, 2011; Online July 25, 2011

Current technologies of concentrated solar power plants (CSP) are under extensive industrial development but still suffer from lack of adapted thermal energy storage (TES) materials and systems. In the case of extended storage (some hours), thousands of tonnes of materials are concerned leading to high investment cost, high energy and GHG contents and major conflicts of use. In this paper, recycled industrial ceramics made by vitrification of asbestos containing wastes (ACW) are studied as candidates to be used as sensible TES material. The material presents no hazard, no environmental impact, good thermophysical properties (λ= 1.4 W m−1 K−1 ; Cp = 1025 J kg−1 K−1 ; ρ= 3100 kg m−3 ) and at very low investment cost. Thanks to the vitrification process of the wastes, the obtained ceramics is very stable up to 1200 °C and can be directly manufactured with the desired shape. The vitrified ACW can be used as TES material for all kinds of the CSP processes (from medium up to high concentration levels) with properties in the same range than other available materials but with lower cost and without conflict of use. The proposed approach leads also to sustainable TES allowing a pay back of the energy needed for the initial waste treatment. Furthermore, this new use of the matter can enhance the waste treatment industry instead of land fill disposal.

Copyright © 2011 by American Society of Mechanical Engineers
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Figure 1

Consumption of Asbestos during the 20th century. (1) Europe, (2) Former Soviet Union, (3) USA, and (4) Asia.

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Figure 2

Glassy ACW vitrified materials

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Figure 3

Vitro-ceramic ACW vitrified material

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Figure 4

SEM picture of glassy ACW vitrified materials

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Figure 5

SEM picture of vitro-ceramic ACW vitrified materials

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Figure 6

XRD analysis under temperature of glassy vitrified material, from room temperature to 1000 °C for two successive thermal cycles

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Figure 7

DSC heat flow diagram of glassy material from room temperature to 1000 °C

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Figure 8

DSC heat flow diagram of vitro-ceramic material from room temperature to 1000 °C

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Figure 9

Specific thermal capacity of the ACW ceramic as function of the temperature. (•) Experimental data, (-) Eq. 1, (- -) gehlenite [24], (- . -) anorthite [24].

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Figure 10

Thermal conductivity of ACW ceramics as function of temperature. (○) First heating, (□) first cooling, (•) second heating, (-) Eq. 2, (- -) Eq. 3.

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Figure 11

Thermal expansion of ceramic material from room temperature to 900 °C. (-) sample 1 and (- -) sample 2.

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Figure 12

Young modulus versus coefficient of thermal expansion of various materials (○) and the vitrified ACW ceramics or glassy samples (•)




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