尿素合成塔模拟计算

从热力学原理出发，建立了尿素合成条件下NH3-CO2-H2O-urea体系的热力学气液平衡机理模型，针对合成塔的操作条件，对部分热力学参数进行了优化。在此基础上，根据尿素合成塔结构及合成反应机理，采用本热力学机理模型，基于塔板上全混流模型对尿素合成塔进行了模拟计算，采用迭代法求解模型组成的非线性方程组，对初值的要求不高，易于收敛，计算结果同设计数据相符较好。

Simulation of urea reactor

Based on the thermodynamic principle, the thermodynamic model of NH 3 CO 2 H 2O urea system is proposed. Considering reactor synthesis conditions, some parameters have been optimized and the results of thermodynamic model agree well with experimental data. According to the structure of reactor and characteristics of reactions in urea reactor, the reactor is modeled as a series of perfectly stirred reactors. With the iterative method to resolve the non linear equation set, convergence of the algorithm is better without supplying a good initial guess. The simulation results agree well with designed data. The method is effective in the simulating of gas and liquid reaction process when the chemical equilibrium has been involved in the thermodynamic model that can be resolved separately.