三层结构加氢反应器器壁中氢扩散的数学模型

Mathematical model of hydrogen diffusion in treble layer structure wall of hydrogenation reactors

根据Ｄｅｖａｎａｔｈａｎ－Ｓｔａｃｈｕｒｓｋｉ提出的电化学渗氢原理，采用专利的电化学氢探头测定氢在金属中渗透速率的方法，建立了氢稳态扩散时在热壁三层结构的加氢反应器器壁中氢浓度计算的数学模型。在反应器的运行条件下，氢渗透过程受扩散控制。只要检测出氢探头在一定温度下的稳态渗氢电流密度ｉ∞，通过计算机程序选择适当的参数输入，应用提出的计算公式可计算单层、双层或三层加氢反应器器壁中各关键界面的氢浓度及器壁径向任意指定剖面上的氢浓度分布。

Based on the principle of the electrochemical hydrogen permeation presented by Devanathan-Stachurski , the mathematical model for calculating the hydrogen concentration distribution in the treble layer wall of hydrogen reactor at the condition of steady diffusion of hydrogen was suggested by using the electrochemical probe described in the Chinese Invention Patent: 95111971.0 for determining hydrogen permeation rate in metals. The process of hydrogen permeation was controlled by the hydrogen diffusion step under the operation condition of the reactor. As long as the steady hydrogen permeation current density i∞ was detected in the hydrogen probe at a given temperature, the interface hydrogen concentrations on the key interfaces and hydrogen distribution at any given radial section in the single, double or treble layer wall of hydrogenation reactor could be found by applying the presented equations through suitable parameters input of computer program. The theoretical bases were provided for detecting or monitoring the concentration of atomic hydrogen in the walls of hydrogenation reactors.