基于 用户模型的甲醇合成模拟及分析

对板间换热式甲醇合成塔建立了一维拟均相数学模型,并用四阶Runge-Kutta法求解其轴向温度与浓度分布。利用Aspen Plus中的User 2模块将其嵌入整个甲醇合成全流程进行模拟,并用取自工厂的实际数据进行验证,结果吻合良好。分析得到了原料气入口温度、操作压力、汽包压力及进料流量对反应器出口甲醇物质的量分数的影响,以及不同时期催化剂的活性分布及粗甲醇的产量分布,提出了在催化剂中后期应采取提高操作压力的措施来保证粗甲醇的产量。 An one-dimensional mathematical model for methanol reactor with plates for heat exchanging was developed and solved by fourth-order Runge-Kutta method to predict the profiles of temperature and mole fraction along axial direction of reactor.Combining with Aspen Plus using its user model,named User 2,the whole process is simulated and analyzed.The influence of the inlet temperature of feed gas,operation pressure,cooling water pressure and inlet flow rate were investigated.The catalyst activity of reaction bed at different height and time was obtained,and the yield of crude methanol under different catalyst activity was predicted.Found that the operation pressure should be increased in order to keep high methanol yield after the deactivation of catalyst