【摘要】 通过关联氨合成反应的平衡方程、最佳温度和平衡温度相关方程、表观反应热与温度相关方程、速率方程、氨摩尔分率与床层高度相关方程和氨摩尔分率与转化率相关方程,建立了氨合成最大反应速率的数学模型,提出了模型的数值解方法和步骤,并以三套管冷管并流式氨合成塔为例,计算和绘制了最大氨合成反应速率Rm与最佳氨摩尔分率yNH3,m(或转化率xm)、最佳反应温度Tm和催化床高度的的关系曲线Rm-yNH3,m(或Rm-xm)和Rm-Tm、Rm-L,比t-y(x)-R图更能直接、清楚地反映出在催化剂床层内氨合成最大反应速率随氨摩尔分率(或转化率)和反应温度变化的动力学规律以及轴向实际反应速率与最大反应速率的偏离程度.更多还原

【Abstract】 The mathematical model for calculating the maximum reaction rate of ammonia synthesis was established by correlating equilibrium correlation,maximum temperature - equilibrium temperature correlation,apparent reaction heat - temperature correlation,reaction rate correlation,ammonia mole fraction - catalyst bed height correlation and ammonia mole fraction correlation of ammonia synthesis,and the numerical solution method for solving the model was introduced in this paper.The typical three-tube co-current ammonia synthesis reactor was taken as an example to calculate the maximum reaction rate R_m corresponding to the maximum ammonia mole fraction y_<sup>NH₃, m （or maximum conversion x_m ）,maximum reaction temperature T_m and catalyst bed height L.The curves of R_m-y_<sup>NH₃ ,m （or R_m - x_m）,R_m-T_m and R_m-L were drawn with the calculated data,which can directly and clearly find the dynamic law of which the maximum reaction rate changes with ammonia mole fraction （or conversion ） and reaction temperature respectively as well as the axial deviation extent of the practical reaction rate with the maximum reaction rate in the catalyst bed.更多还原