气态烃自热转化炉冷态实验研究与数值模拟

采用恒温式热线风速仪测自热转化炉内速度分布,用Realizable κ-ε湍流模型对流场进行模拟,其模拟结果和实验结果比较吻合.轴距小于21d0(喷嘴直径)时,轴线速度的衰减规律不受催化剂床层高度和气速的影响.转化炉内回流量随着轴距的增加,先增大后减小;随着催化剂床层高度的增高,回流比分布曲线变窄,回流量最大值为进口流量的6～7倍;轴距小于20d0,催化剂床层高度对回流比大小的影响不大.在实验条件范围内,改变气速,回流比的大小不变.

Cold Model Experiment and Simulation of Autothermal Reforming Reactor

The flow field of the autothermal reactor was measured by Hot-Wire Anemonetry (HWA) and simulated by Realizable /re turbulence model. The simulation results agreed well with the experimental results. The results showed that when axial distance was shorter than 21 times diameter of the nozzle, the axial velocity was inversely proportional to the axial distance and the decay of axial velocity was not influenced by catalyst bed height and inlet velocity. There were refluxes in the reactor and the reflux ratios were first increased and then decreased with the increase of the axial distance. The curves of reflux ratio distribution became narrow with the increase of catalyst bed height. The highest reflux was 6 - 7 times inlet flow rate. Reflux ratio was not affected by catalyst bed height when axial distance was shorter than 20 times diameter of the nozzle. At the range of the experimental conditions, reflux ratio was not influenced by inlet velocity.