Study on the influence of dehydrogenation performance in a new MgH2 solid hydrogen storage device
To investigate the factors influencing on the hydrogen release performance of the new Mg H2 solid-state hydrogen storage device,a new Mg H2 solid-state hydrogen storage device was de-signed and constructed in the study,and the influences of pressure,the inlet temperature of heat ex-changer fluid,the flow rate of heat exchanger fluid,and the presence or absence of the outer annular heat exchanger layer on the rate of the hydrogen release reaction were numerically investigated.The results indicated that the dehydrogenation reaction rate decreased when the pressure increased from 0.4 MPa to 0.6 MPa,but the dehydrogenation reaction completion time remained almost unchanged.When the inlet temperature of the heat transfer fluid increased from 550 K to 650 K,the hydrogen re-lease reaction rate increased rapidly.Compared with the inlet temperature of the heat transfer fluid at 600 K,the hydrogen release reaction time at the inlet temperature of the heat transfer fluid at 650 K was shortened to about 50%.When the flow rate of the heat transfer fluid increased from 1 m/s to 2 m/s,the hydrogen desorption reaction rate of the reactor increased,but the total reaction time did not change significantly.Increasing the outer annular heat exchange fluid layer could greatly shorten the time required for hydrogen desorption.Compared with the hydrogen desorption reaction time of the reactor without the outer annular fluid layer,the hydrogen desorption reaction time of the reactor with the outer annular fluid layer could be shortened by nearly 31.25%.
Mg H2 solid hydrogen storage deviceinfluencing factorsreaction ratenumerical study
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