内螺旋管金属氢化物反应器吸氢过程数值分析及优化

Numerical Analysis and Optimization of Metal Hydride Reactors Incorporating Helical Coils During Adsorption

针对金属氢化物反应器传热性能较差的问题,采用田口方法对内置螺旋换热管的氢化物反应器进行了优化研究。建立金属氢化物反应器的3维多物理场耦合模型并采用COMSOL Multiphysics V4.4软件来求解。采用田口方法安排出具有代表性的螺旋结构参数组合,通过反应器模型计算得到各个组合的性能。结果表明:螺旋管的换热系数和换热面积都较大,因此内置螺旋管的氢化物反应器的性能较理想;随着螺旋数N和螺旋管直径do的增加,反应器的单位重量蓄热功率GHSR大大提高,而螺旋线直径D对反应器性能影响很小;最优的螺旋管参数组合为:D=32 mm、N=6和do=8 mm,相应的GHSR达到62.90 W/kg。

The heat transfer performance of metal hydride reactors is poor. To solve this problem,Taguehi methods was used to optimize the design parameters of metal hydride reactors equipped with helical coil heat exchanger. A three-dimensional multi-physics model for the metal hydride reactor was proposed and solved using the eommereial software package COMSOL Multiphysics V4.4. Some typical combinations of structural parameters for helical coil tubes were selected by using Taguehi methods, and the performanee of the reactors with different helical coil tubes was evaluated by numerical simulations based on the reactor model. The analysis results indicated that the performance of the metal hydride reactor equipped with the helieal coil heat exchanger was better because the heat transfer coefll- cient and the heat transfer area of the helical coil heat exchanger were larger in compared with the straight tube. As the pitch number of the helical coil （N） and the minor radius of the helical coil （ do ） increased,the gravimetric heat storage rate （GHSR） increased. How- ever,the major radius of the helical coil （D） had a little effect on the reactor performance. The optimal parameters of the reactor were D of 32 mm,N of 6 and do of 8 mm, and accordingly the maximum value of GHSR was 62.90 W/kg.