金属氢化物的吸附性能和活性炭贮氢的可行性

Properties of metal hydride's adsorption and feasibility of activated carbon in storing hydrogen

目前迫切需要解决氢能在输送和存储上的困难。碳材料吸附和金属氢化物吸附储氢都是经济可行的储氢手段。通过所建立的同心圆柱体物理模型,可以计算金属氢化物脱附和吸附反应锋面的瞬时位置,以及反应的热流量和氢气流量。模拟结果证明,氢气流量和热流量对时间的变化与压力有关,也与热源温度有关;表明合金材料的成分和性能对金属氢化物吸附特性有明显的影响。适当地选择村料并加以性能调整,可以提高其性能和效应。从燃料存储系统的重量及其特性看,碳材料吸附储氢比金属氢化物更适合车用。活性炭吸附技术,能够达到吸放氢条件温和、储氢容量大和成本低这三个基本要求。

In order to utilize hydrogen energy the difficulties from hydrogen's transportation and storage should be solved. This paper established a heat transfer and mass transfer model composed of three concentric cylinders. The simulation and research manifest that the front of hydrogen adsorption reaction moves faster at the initial period than other periods. The higher the hydrogen pressure level while hydrides metal absorbs hydrogen, the faster the reaction is. Thermal conductivity in hydrides metal has a great effect on the rate of hydriding and dehydriding reaction. Therefore, the adsorption reaction of thinner layer should be used to store hydrogen, In the view of reducing the weight and raising the performance, activated carbon is more suitable for vehicles' hydrogen storage than metal hydrides because of its gentle adsorption, light weight and low cost