Abstract: In view of the leakage of the reboiler tube bundles of the stabilizer of deep catalytic cracking (DCC-plus) unit in a petrochemical enterprise, which seriously affected the long-term safe operation of the unit, the reasons were analyzed from the aspects of equipment structure, process operation, equipment corrosion, etc. By taking emergency measures such as optimizing the control scheme of the reboiler heat exchange system and optimizing the process parameters, the internal leakage of the reboiler tube bundles was restrained and the running period of the reboiler was prolonged. The problem of internal leakage of reboiler tube bundles was solved through structure reform of reboiler and optimization of process pipeline during overhaul, it not only eliminated hidden trouble of safety, but also saved 3.5 MPa medium-pressure steam 9.7 t/h, benefit about 23.9 million Yuan per year.

Key words: deep catalytic cracking, stabilizer, reboiler, tube bundle leakage, baffle, vibration, energy saving