关键词: 催化裂化装置, 外取热器, 爆管, 动态模拟, Aspen Dynamics, 破口面积, 再生压力, 双动滑阀

Abstract:

Based on the analysis of the regenerator system of a typical FCCU, a dynamic simulation model 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 simulation model, a dynamic simulation study was conducted on the tube bundle leakage of the catalyst cooler for a newly built 3.5 MM TPY 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 pressure when the tube bundle leakage happened and quickly restored normal operating regeneration pressure values, and it was beneficial for the safe and stable operation of the unit.

Key words: FCCU, catalyst cooler, tube bundle leakage, dynamic simulation, Aspen Dynamics, rupture area, regeneration pressure, double powered slide valve