甲醇合成塔热稳定性分析

Simulation Study on Thermal Stability of An Methanol Synthesis Reactor

以实际联醇生产装置为对象,建立了双向冷管式甲醇合成塔的稳态数学模型,并通过自开发用户模块,在AspenPlus软件中实现了该类合成塔的仿真计算模型。在此基础上针对工厂实际运转的合成塔的热稳定性问题进行了仿真分析。采用原料气CO浓度-主线流量分率(Yco-f)坐标系绘制合成塔热稳定性图,可以直观地表征甲醇合成塔的热稳定工况,为工厂进行现场分析和操作调节提供了简捷的方法和工具。数学模型的仿真结果对工厂运行过程中的合成塔温度波动现象提供了合理的解释,并给出了不同Yco条件下主线流量分率的稳定操作范围和优化操作值。

A simulation model of bi-direction cooling tube reactor for methanol synthesis was set up and implemented in Aspen Plus with help of user-built blocks. The thermal stability of the reactor was analyzed by steady-state simulation. The results were plotted, in the inlet composition vs. flow fraction of main stream coordinates, as thermal stability map which visually characterizes the thermal stability status in a convenient and easy-understanding way. The deductions based on the analysis agree well with the phenomena observed in industry and give a rational explanation of the thermal behavior and operational ability of this kind of reactors. An optimal operation curve also was drawn in the thermal stability map for maximum methanol productivity.