Title
Preparation and Characterization of Sodium Sulfide Hydrates for Application in Thermochemical Storage Systems
Author
Roelands, C.P.M.
Cuypers, R.
Kruit, K.D.
Oversloot, H.P.
de Jong, A.J.
Duvalois, W.
van Vliet, L.
Hoegaerts, C.L.G.
Publication year
2015
Abstract
Bottlenecks for realizing a commercial system for thermochemical heat storage (TCS) with hygroscopic salts are the chemical, physical and mechanical stability of the salt under operation conditions. Hence, improved knowledge of thermochemical materials (TCMs) is critical to spur progress in TCS system development. Sodium sulfide hydrates (Na2S.nH2O, n=0-9) are highly interesting as TCMs because they exhibit a high energy density under operation conditions and are potentially readily available and affordable. Preparation methods for well- defined nonahydrate and pentahydrate crystals of Na2S were developed and the resulting samples were subjected to cycling experiments under conditions representative for TCS. Before and after cycling, crystal samples were taken and characterized using techniques like SEM/TEM, XRD. Mechanical strength was evaluated using a salt bed stability test. Based on the extensive characterization of sodium sulfide hydrate salts, a method has been proposed to improve the stability of the salt by blending it with cellulose. First trials on these composites yielded promising results with respect to improved material stability.
Subject
Hygroscopic
Blending
Chemical stability
Composite materials
Energy storage
Heat storage
Hydration
Mechanical stability
Sodium compounds
Sulfur compounds
High energy densities
Operation conditions
Thermo-chemical heat storage
Thermochemical storage
High Tech Systems & Materials
Industrial Innovation
Fluid & Solid Mechanics Observation, Weapon & Protection Systems
PID - Process & Instrumentation Development EM - Energetic Materials
TS - Technical Sciences
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http://resolver.tudelft.nl/uuid:98e549a1-6754-4cd1-a672-7ff51330ecfb
TNO identifier
574312
Publisher
Elsevier, Amsterdam
ISSN
1876-6102
Source
3rd International Conference on Solar Heating and Cooling for Buildings and Industry, SHC 2014, Beijing, China, 13-15 October 2014, 70 (70), 257-266
Series
Energy Procedia
Document type
conference paper