Experimental study of powder bed behavior of sodium alanate in a lab-scale H2 storage tank with flow-through mode
Utz, Inga and Linder, Marc and Schmidt, Niko and Hu, Jianjiang and Fichtner, Maximilian and Wörner, Antje (2012) Experimental study of powder bed behavior of sodium alanate in a lab-scale H2 storage tank with flow-through mode. International Journal of Hydrogen Energy, 37, pp. 7645-7653. Elsevier. DOI: 10.1016/j.ijhydene.2012.02.016.
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Chemical hydrogen storage in complex hydrides offers the potential of high gravimetric storage densities compared to intermetallic hydrides, and is therefore a promising technology for mobile applications. The main challenge for mobile application is still the required high refuelling rate of the hydrogen storage tanks. Since hydrogen is bonded by an exothermal chemical reaction in complex hydrides, appropriate storage tanks require high heat transfer rates for the cooling of the tank. Hydride tanks that are state of the art rely on an indirect cooling and are additionally equipped with e.g. finns, foams, etc. to improve the heat transfer rate. For the present study, an improved laboratory tank, which allows for indirect as well as direct cooling by excess H2 gas (flow-through mode), has been designed and built. This laboratory tank is filled with 87 g of NaAlH4 (doped with 2 mol% CeCl3) and equipped with 8 thermocouples as well as two pressure sensors. Experimental results presented in this paper show a significant influence of the cooling by gaseous excess H2 on the flow-directional temperature profiles at the part of the reaction bed close to the inlet. Considering the overall conversion, this influence is rather small due to the low heat capacity flux (r cp)H2. Furthermore, it is shown that changes in material properties, attributed to the effects of heat and mass transport as well as intrinsic reaction kinetics, can be measured and assessed by the temperature and pressure sensors. After about 10 complete charging and discharging cycles, the initial permeability K of the bed has decreased by 50% to 1.6$1012 m2. In the same time, the initial thermal conductivity has increased by a factor of 1.3 to values reported in literature (0.67 Wm1 K1) and remains constant during further cycles. Additionally, it is observed that the reaction rate of the second absorption step improves, even after a total of 36 cycles.
|Title:||Experimental study of powder bed behavior of sodium alanate in a lab-scale H2 storage tank with flow-through mode|
|Date:||02 February 2012|
|Journal or Publication Title:||International Journal of Hydrogen Energy|
|In Open Access:||No|
|In ISI Web of Science:||Yes|
|Page Range:||pp. 7645-7653|
|Keywords:||Hydrogen storage, sodium alanate, reactor design, direct heat transfer, cycling stability|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Transport|
|HGF - Program Themes:||V BF - Bodengebundene Fahrzeuge|
|DLR - Research area:||Transport|
|DLR - Program:||V BF - Bodengebundene Fahrzeuge|
|DLR - Research theme (Project):||V - Fahrzeugenergiesysteme (old)|
|Institutes and Institutions:||Institute of Technical Thermodynamics > Thermal Process Technology|
|Deposited By:||Inga Utz|
|Deposited On:||26 Apr 2012 11:18|
|Last Modified:||07 Feb 2013 20:25|
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