焦化分馏塔模拟分析及改进

Simulation analysis and improvement on fractionation column in delayed coking unit

某石化公司计划将2#延迟焦化装置处理量由140万吨/年提高到原设计规模220万吨/年,将焦化分馏塔由原来的塔盘堵孔操作恢复到设计负荷。但近年来塔河原油性质已发生较大变化,沥青质含量上升较大。为了对焦化分馏塔恢复产能后操作性能进行预估,调研收集塔河石化2#延迟焦化装置生产数据。通过建立其工艺计算模型,分析焦化分馏塔操作中的存在的问题;分析影响其分离精度的塔结构问题。针对焦化分馏塔恢复产能提出了相应的改造建议,并进行了模拟计算和水力学计算验证。为分馏塔的优化操作和改造提供依据,同时为恢复产能后的分馏塔稳定生产提供理论指导。

It was planned to increase the capacity of 2^# DCU （delayed coking unit） in Sinopec a Petrochemical from 1.4Mt/a to originally designed 2.2Mt/a. The blocked holes on trays of fractionation column would be opened. Meanwhile,the properties of crude oil changed greatly in recent years, especially asphaltene content. For pre-estimating operating performance of fractionation column after capacity recovery,production data were collected. Its problems in operation were analyzed by building a process calculation model. Moreover,the influence of tower structure on separation accuracy was analyzed. Referring to capacity recovery of fractionation column,improvement suggestions were made and verified by simulation and hydraulic calculation to provide the basis for operation optimization and transformation of fractionation tower and the theoretical guidance for fractionation column stable production after capacity recovery.