渣油制氨气化—变换系统流程模拟

The Process Simulation of Gas Generation and Shift Conversion Reaction In Ammonia Synthesis System

本文对UBE型渣油制氨的气化—变换系统进行稳态模拟。用马丁-候状态方程作为热力学模型来计算真实气体的热力学性质,并在此基础上引入平衡温距的概念来描述高温高压下的气化反应。根据Prausnitz提出的方法建立了8.7MPa压力下的汽液平衡模型,用校正的动力学方程来计算变换反应速度,采用序贯模块法进行了流程模拟。以设计工况为基准的实例分析表明模拟结果与实际数据符合良好。对各关键单元进行的模拟操作分析,为该系统的优化计算和改进现行操作工况提供了较好的依据。

The Martin-Hou equation of state is used to determine the thermodynamic properties of real gases in the simulation of gas generation of residual oil and shift conversion process at the pressure of 8.7MPa.Because of the complicity of gas generation at high pressure, the departure equilibrium temperature is introduced to correct the difference between real temperature and equilibrium temperature. A suitable mathematical model is developed to calculate the multicomponent vapor-liquid equilibrium at high pressure according to the Prausnitz's method. Also a similar corrected kinetic equation is derived as the kinetic equation of the C-113 catalyst. Furthermore, the sequential modual approach is addopted for the process simulation.The results of the process simulation are failly in agreement with the design values of UBE CO. The simulation operation analyses of the key units of the system provide a good basis for further design and improvment.