Thermal modeling of hydrogen storage by absorption in a magnesium hydrides tank

Abstract

-This paper summarizes numerical results of hydrogen absorption simulated in an axisymmetric tank geometry containing magnesium hydride heated to 300°C and at moderate storage pressure 1 MPa. The governing equations are solved with a fully implicit finite volume numerical scheme used by a commercial software FLUENT. The effect of the different kinetic reaction equations modeling hydrogen absorption was studied by the introduction of a specific subroutine at each time step in order to consider which one will provide results close to available experimental results. Spatial and temporal profiles of temperature and concentration in hydride bed are plotted. Results show that suitable method for our two-dimensional study is a CV-2D technique because it generates the smallest error especially during the beginning of the reaction. Also, its computational time is the shortest one compared to the other methods.

An Overview of the Recent Advances of Additive-Improved Mg(BH4)2 for Solid-State Hydrogen Storage Material

“…Storing H 2 in a solid-state form is quite promising compared with liquified H 2 and compressed H 2 gas in terms of safety, energy efficiency, space and cost-effectiveness [31][32][33]. Solid-state H 2 storage can be divided in two particular ways: by chemical adsorption (chemisorption), which is based on the simple or complex chemical absorption of atomic H 2 in light metal hydrides, and physical adsorption (physisorption), which relies on the adsorption of molecular H 2 on high-surface-area materials [34].…”

The kinetics of lightweight solid-state hydrogen storage materials: A review

“…Solid-state storage via chemical means within the storage materials has potential advantages over conventional storage by providing improved energy efficiency, safety and high volumetric and gravimetric storage capacities, as well as presenting the capability to absorb/desorb at a medium temperature of 300 C and a pressure between 1 bar and 10 bar [4,5]. Chemisorption involves strong chemical bonding between the solid material and hydrogen atoms, leading to the formation of hydrides [6].…”