流程模拟技术在丙烯腈装置上的应用

The Application of Process Simulation in Acrylonitrile Plants

国内的丙烯腈装置大多采用丙烯氨氧化工艺,由于该工艺过程循环较多,组分之间的交互作用较强,凭经验难以确定各操作参数对丙烯腈回收率及产品质量的综合影响。应用Aspen Plus软件建立丙烯腈装置回收及精制单元流程模拟模型,包括急冷塔系统、吸收塔系统、回收塔系统、乙腈塔系统、脱氰塔系统和成品塔系统,模型计算值与实际值非常吻合。通过模型对装置运行状况进行分析,在平衡装置能耗和产品经济效益的基础上,判断装置是否处于优化状态下运行,寻找装置能耗和产品之间的操作平衡点,确定装置各系统最优化的操作参数。通过对中石化两套丙烯腈装置进行模拟与优化,方案实施后,每年共实现挖潜增效390.56万元,在降低装置能耗和提升装置经济效益的同时,也提高了丙烯腈装置的精细化操作水平和管理水平。

Most acrylonitrile plants in China use the propylene ammmoxidation process.Due to the large num-ber of circulations and strong interactions among various components in the process,it is difficult for technicians to judge the overall effect of various operating parameters on the yield of acrylonitrile and product quality by experience.Using the Aspen Plus software,technicians established a model to simulate the process of the recovery and refining units of an acrylonitrile plant,which covers the quick quenching column system,absorption column system,recovery column system,acetonitrile column system,decyanation column system and finished product column system.The values computed based on the model highly accord with the actual val-ues.Based on this model,these technicians analyzed the operation of the plant.While ensuring a balance be-tween energy consumption and product economics,they tried to judge whether the plant was operating in an optimized state,find the point of balance between energy consumption and product production and determine the optimal operating parameters for all systems of the plant.The process simulation and optimization for Sinopec′s two acrylonitrile plants has brought the company about 3.91 million yuan in economic benefits an-nually.While reducing energy use and increasing economic benefits,the simulation and optimization has also resulted in an increase in the level of operation and management of the acrylonitrile plants.