AB _{Research 5} And Type Metal Hydride Reactor Characteristics

The metal hydride has become a carrier of the hydrogen storage and transportation due to the mild reaction conditions, large amount of hydrogen storage and advantages of long cycle time. It has become a hot spot that using hydrogen storage alloy to store hydrogen on current research. The metal hydride reacted with hydrogen is an exothermic and endothermic process, whether it is quickly to remove the heat from the reaction bed or provide the heat to the reaction bed which will be the key to ensure the high reaction rate. Improve the heat transfer efficiency include the two method of the optimization of metal hydride and reactor. In depth studies the metal hydride and reactor were carried out in this thesis, and given the following results.The experimental study were carried out in the PCT and reaction kinetics of LaNi4.7Al0.3. By analyzing for the reaction kinetics, we got the reaction mechanism of LaNi4.7Al0.3adapted to the JMA model. In addition, the absorption reaction kinetics comparison of LaNis and LaNi4.7Al0.3obtained that LaNi4.7Al0.3apparently higher than LaNis on the absorption rate. On the basis of the local thermal equilibrium model, the mathematical model is validated based on the experimental data.By adjusting for the multi-tubes reactor structure and the operating parameters of MmNi4.6Al0.4, an ideal reactor and operating conditions were designed for the compressor with high efficiency. The4-layer multi-tube reactor, hydrogen pressure, temperature and heat transfer coefficient are2/0.05MPa (absorption/desorption),293/393K,1000W/m2.K-1were the optimized conditions.Numerical model equation was adopted to conduct the comparison of the annulus&disk reactor, the arc reactor and the multi-tubes reactor. The results show the multi-tubes reactor with high heat transfer area and dispersion performs the best performance during the H2absorption process among the3typical reactors. At1700s, the reacted fraction of the annulus&disk reactor, the arc reactor and the multi-tubes reactor equal to0.68、0.70and0.74respectively.In this thesis, a novel finned multi-tubular metal hydride reactor is presented and energy equations during heat transfer process are derived based on heat transfer characteristic of the reactor with various configuration fins (radius, thickness and number). By adjusting the above structural parameter, heat transfer rate of the reaction process was improved in a large extent and enhance reaction efficiency of the metal hydride. The fin number had the most significant positive effect on the heat transfer efficiency. The effect of hydrogen pressure, heat transfer coefficient and fluid flow velocity for the novel finned multi-tubular reactor was simulated in this thesis. The results showed that the hydrogen pressure has the most remarkable impact among three factors. Under the hydrogen pressure1MPa and0.5MPa, the absorption reaction was completed in1700s and more than2000s.