制氢转化炉内甲烷蒸汽重整模拟及影响因素分析

Simulation of Methane Steam Reforming in Hydrogen Reforming Furnace and Analysis of Influencing Factors

考虑40 000m^3/h顶烧式常压加热制氢转化炉的结构特点,建立了制氢转化炉辐射室流体的三维有限元模型,采用有限体积法计算辐射室温度场,得到了转化管外壁面轴向温度的分布规律,并以外壁面温度为边界条件,以多孔介质模型表征催化剂床层,模拟了催化剂床层在转化管内的甲烷蒸汽重整制氢过程,研究了不同入口速度、入口温度的变化对甲烷转化率的影响规律。结果表明:入口速度的下降和入口温度的增加都会提高甲烷转化率。

Considering the structural characteristics of 4×10^4m^3/h top-burning atmospheric pressure heating hydrogen conversion furnace, the 3 D finite element model of the fluid in the radiation chamber of the hydrogen conversion furnace was established, including the calculation of temperature field of the radiation chamber by the finite volume method so as to obtain the axial temperature distribution law of the outer wall surface of the reformer tube;through taking the temperature of the outer wall surface of the reformer tube as a boundary condition and characterizing the catalyst bed by the porous medium model, the hydrogen production process of the methane steam reforming in the catalyst bed within reformer tube was simulated. The influence of different inlet velocities and inlet temperatures on the methane conversion rate was studied. The results show that, both the decrease in inlet velocity and the increase in inlet temperature can increase the methane conversion rate.