基于典型FCC(催化裂化)装置再生系统分析,提出了利用Aspen Dynamics软件建立外取热器爆管时再生系统再生压力的动态模拟模型.通过与某 1.80 Mt/a中型FCC装置外取热器爆管后再生压力变化现场数据对比,模型的可靠性得到了验证.以通过验证的动态模拟模型对某新建3.50 Mt/a大型FCC装置外取热器爆管时的再生压力进行动态模拟研究,定量分析4 种不同工况下外取热器爆管对再生压力的影响.研究结果表明:外取热器爆管后再生压力迅速上升,再生压力峰值随破口面积增加而增大,双动滑阀处于自动控制状态可以显著降低再生压力峰值;正常操作时应将双动滑阀投自动控制状态,以降低爆管后再生压力峰值,此状态能快速恢复再生压力至正常操作值,有利于装置的安全平稳运行.
Based on the analysis of the regenerator system of a typical FCCU,a dynamic simulation mod-el for the regeneration pressure during the tube bundle leakage of the catalyst cooler was set up.The dynamic simulation model of the catalyst cooler and regenerator system was established using Aspen Dynamics software.By comparing the field data of the regeneration pressure change after tube bundle leakage with the calculation result in a 1.8 MM TPY FCC unit,the reliability of the model was proved.Based on the proved dynamic sim-ulation model,a dynamic simulation study was conducted on the tube bundle leakage of the catalyst cooler for a newly built 3.5 MMTPY large-scale FCCU,and the impact of the tube bundle leakage of the catalyst cooler on the regeneration pressure under four different operating conditions was quantitatively analyzed.The research results showed that the tube bundle leakage could lead to a rapid increase of the regeneration pressure,and the peak of regeneration pressure was proportional to the area of the tube bundle rupture.The peak of regeneration pressure during automatic control of the double powered slide valve was much lower than that during manual control of the double powered slide valve.After the operation of the catalytic cracking unit was stable,the double powered slide valve should be put into automatic control mode,to reduce the peak of regeneration pres-sure when the tube bundle leakage happened and quickly restored normal operating regeneration pressure val-ues,and it was beneficial for the safe and stable operation of the unit.