Abstract
The simulation of hydrogen purification in a mixture gas of hydrogen/carbon dioxide (H2/CO2) by metal hydride system was reported. The lumped parameter model was developed and validated. The validated model was implemented on the software Matlab/Simulink to simulate the present investigation. The simulation results demonstrate that the purification efficiency depends on the external pressure and the venting time. An increase in the external pressure and enough venting time makes it possible to effectively remove the impurities from the tank during the venting process and allows to desorb pure hydrogen. The impurities are partially removed from the tank for low external pressure and venting time during the venting process and the desorbed hydrogen is contaminated. Other parameters such as the overall heat transfer coefficient, solid material mass, supply pressure, and the ambient temperature influence the purification system in terms of the hydrogen recovery rate. An increase in the overall heat transfer coefficient, solid material mass, and supply pressure improves the hydrogen recovery rate while a decrease in the ambient temperature enhances the recovery rate.
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Abbreviations
- ΔH :
-
Reaction enthalpy, J/mol
- ΓS :
-
Reaction entropy, J/mol/K
- A :
-
Area of heat transfer, m2
- C p :
-
Heat capacity, J/kg K
- E :
-
Activation energy, J/mol
- f :
-
Net mass flow rate, g/s
- imp :
-
Impurity
- m :
-
Mass, g
- M:
-
Molecular weight, kg/mol
- P eq :
-
Equilibrium pressure, Pa
- r :
-
Reaction rate, gMH/gs/s
- R :
-
Universal gas constant, J/mol K
- sl :
-
Plateau slope coefficient
- T f :
-
Ambient temperature, K
- T ∞ :
-
inflow/outflow temperature, K
- U :
-
Overall heat transfer coefficient, W/m2 K
- V g :
-
Volume for gas phase in the reactor, m3
- a :
-
Absorption
- d :
-
Desorption
- CO2 :
-
Carbon dioxide
- H2 :
-
Hydrogen gas
- in:
-
Inlet
- MH:
-
Metal hydride
- out:
-
Outlet
- s:
-
Solid
- v:
-
Venting
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Funded by National Natural Science Foundation of China (No. 51476120), 111 Project (No.B17034), and the Innovative Research Team Development Program of Ministry of Education of China (No. IRT_17R83)
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Koua, K.A.J., Tong, L., Yang, T. et al. High Purity Hydrogen Production by Metal Hydride System: A Parametric Study Based on the Lumped Parameter Model. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 36, 127–135 (2021). https://doi.org/10.1007/s11595-021-2385-y
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DOI: https://doi.org/10.1007/s11595-021-2385-y