化工系统分析和模拟在大型氨合成系统中的应用

Applications of Chemical System Analysis and Simulation in Large-Scale Ammonia Synthesis System

根据化工系统工程理论,应用RWH Sargent&AW Westerberg单元串搜索法和自由度分析法对30万吨/年托普索大型合成氨厂氨合成系统进行流程分块、再循环回路切割和单元设备计算排序,发现当一定的原始设计变量确定后,分析得计算顺序中的每一个单元设备或选择的体系的物料子问题的自由度均为零或小于零,因此,既可避免复杂繁琐的物热联解和全系统的迭代收敛,又可应用序贯模块法进行物料平衡的计算机模拟,使计算快速准确。

The R W H Sargent ＆ A W Westerbergsingle unit series searching method and free degree analysis method in chemical engineering system analysis were used to deposite the fiowsheet, to cut the recircular loop and to make the calculation order for the large- scale ammonia synthesis system （taking the Topuso synthesis ammonia fiowsheet as an example）. The fact was found that the free degrees of each unit equipment or the selected system for material equilibrium in the calculation order were 0 or ≤ 0., which means that not only could the complicated and inconvenient material and heat combination solution and the iteration - convergent： of the whole system be avoided, but also the material balance could be quickly and accurately computed with sequential modular approach.