LiH合成反应器的CFD模拟与过程强化

CFD Simulation and Process Intensification of LiH Synthesis Reactor

为了强化釜式氢化锂(LiH)合成反应器,采用计算流体力学(CFD)方法模拟了该坩埚反应器在静态操作、机械搅拌和气体鼓泡三种情况下的物质传递、化学反应和流体运动规律。模拟结果表明:自然对流对反应有较大的促进作用,其使LiH脱离反应界面,保证界面处"新鲜"金属Li与氢气的有效接触;另外,自然对流也促使反应器内物料良好混合;机械搅拌虽提高了反应物料的混合状况,但并不显著增加反应界面,过程强化程度有限;气体鼓泡可大幅度增加气液接触面积,反应时间大幅度缩减,是一种优选的LiH合成反应器构型。

In order to strength the Lithium Hydride(LiH)synthesis reactor,the material transfer,chemical reaction and fluid motion of the crucible reactor were simulated by the method of computing fluid dynamics(CFD)in static operation,mechanical stirring and gas bubbling.Simulation results showed that natural convection had a great effect on the chemical reaction which made LiH out of reaction interface and ensured the efficient contact between the“fresh”metal Lithium(Li)and the hydrogen at the interface.In addition,natural convection also facilitated good mixing of the materials in the reactor.Although the mechanical stirring increased the mixing of the reaction materials,but did not significantly increase the reaction interface,hence the degree of the process strengthening was limited.Gas bubbling can greatly increase the gas-liquid contact area and the reaction time was greatly reduced.Therefore,bubble reactor is a preferred LiH synthesis eactor configuration.