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化工流程模拟软件不断发展,越来越多的化工装置开始采用流程模拟来优化装置的操作。基于精馏过程的实际运行数据,建立了能够良好描述装置实际运行工况的模型,实现了对芳烃联合装置邻二甲苯精馏过程的流程模拟。利用Aspen Plus建立装置模型,按照工艺条件及产品分离要求,使用设计规定工具,对采用精馏方式从混合C8～C10物料中分离邻二甲苯(OX)工艺进行研究。模拟结果与实际工业过程数据相符,能够满足工业建模的要求。基于模型,研究了进料塔板位置、回流比和塔顶采出量等变量对装置稳定运行的影响,从进料塔板,塔顶采出量和进料组分等方面提出了优化建议。研究结果表明:精馏塔塔顶采出量为OX产品主要杂质异丙苯(IPB)含量的显著影响因素。据此提出了包括回流比和塔顶采出量参数的优化方案,可以使主要杂质异丙苯的含量下降40%的同时,每年可节省燃料成本。
As chemical process simulation software continues to evolve, more and more chemical plants begin to use process simulation to optimize plant operation. Based on the actual operation data of the distillation process, a model that can well describe the actual operating conditions of the unit is established, and the process simulation of o-xylene distillation of aromatics unit is realized. The device model was established by Aspen Plus. According to the process conditions and product separation requirements, the design specification tools were used to study the separation of o-xylene (OX) from mixed C8 ~ C10 materials by distillation. The simulation results are in line with the actual industrial process data to meet the requirements of industrial modeling. Based on the model, the influences of feed tray position, reflux ratio and overhead extraction volume on the steady operation of the plant were studied. The optimization suggestions were put forward from the aspects of feed tray, overhead production and feed composition . The results show that the amount of catalase produced at the top of the rectification column is the significant influencing factor of the cumene (IPB) content of OX products. Based on this, an optimized scheme including the reflux ratio and overhead extraction parameters is proposed, which can reduce the cumene content of major impurities by 40% and save fuel cost annually.