Design of Titanium-based Hydride Hydrogen Storage Reactor and Numerical Study of Hydrogen Absorption and Desorption Process

doi:10.19799/j.cnki.2095-4239.2025.0353

Abstract

Abstract:

Titanium-based hydrogen storage alloys have become a key research focus in the hydrogen storage field due to their high volumetric hydrogen storage density at room temperature, rapid hydrogen absorption and desorption response, low absorption and desorption pressures, abundant resources, and excellent reversibility. However, research on the regulation of hydrogen absorption and desorption rates in titanium-based metal hydride hydrogen storage reactors remains limited. To optimize hydrogen absorption and desorption performance, this study designs a titanium-based metal hydride hydrogen storage reactor that is easy to assemble and refill, with high heat transfer performance. The study fits the hydrogen absorption and desorption kinetic parameters of TiFe_0.8Mn_0.2 based on the Pressure-Composition-Temperature (P-C-T) curve and establishes a three-dimensional multiphysics simulation model that couples flow, heat transfer, and chemical reactions. This model accurately simulates the hydrogen absorption and desorption behavior under various temperature conditions. The study systematically analyzes the impact of key parameters, such as hydrogen inlet and outlet pressure, spacer distance, heat transfer fluid inlet temperature, and flow rate, on hydrogen absorption and desorption performance. The results show that under conditions of a hydrogen inlet pressure of 3 MPa, initial porosity of 0.4, and cooling fluid temperature of 15 ℃, the reactor reaches a volumetric hydrogen storage density of 55.4 g/L after saturation absorption. When the dimensionless time reaches 0.219, the metal hydride fraction reaches 0.95, demonstrating high energy density and fast reaction rates. Under hydrogen outlet pressure of 0.3 MPa and heating fluid temperature of 70 ℃, the desorbed hydrogen amount reaches 88.6 % of the saturated hydrogen absorption amount by the end of the reaction, and at a dimensionless time of 1, the desorbed hydrogen amount reaches 84.8 %. These findings provide valuable guidance for the design of large-scale hydrogen storage systems.

Key words: Reaction kinetics, numerical simulation, metal hydride reactor, heat transfer efficiency

CLC Number:

TK 02

Sizhe YUAN, Yuhao LIU, Changying ZHAO. Design of Titanium-based Hydride Hydrogen Storage Reactor and Numerical Study of Hydrogen Absorption and Desorption Process[J]. Energy Storage Science and Technology, doi: 10.19799/j.cnki.2095-4239.2025.0353.

Figures/Tables 14

Fig. 1

Fig. 2

Table 1

The major physical properties of calculated model"

参数	TiFe_0.8Mn_0.2	H₂	Al	SUS304	单位
密度, $ρ$	6206.7	0.0899	2700	7930	kg/m³
比热容, $c p$	500	14300	900	500	J/(kg $⋅$ K)
导热系数, $k$	4	0.17	238	16.3	W/(m $⋅$ K)
摩尔质量, $M$	0.103538	0.002016			kg/mol
吸氢速率常数, $C a$	1.75				s^-1
放氢速率常数, $C d$	42.04				s^-1
吸氢活化能, $E a$	13840				J/mol
放氢活化能, $E d$	27000				J/mol
吸氢反应焓, $Δ H a b$	-23200				J/mol
放氢反应焓, $Δ H d e$	27700				J/mol
理想气体常数,R		8.314			J/(mol $⋅$ K)
初始孔隙率, $ε 0$	0.4				-
体积膨胀系数， $V V 0$	1.15
渗透率, $κ$	10^-8				m²

Table 1

Fig. 3

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