Research on structural health diagnosis technology of coke drum based on monitoring data

The coke drum, work under high temperature, coke in and out with hot and cold distress through the cycle of 500℃ to 50℃, is the core reactor of the delayed coking device. Typical failure modes of bulge deformation of tower, low cycle fatigue crack of weld, material aging, the tower body bending and inclining is easy to be caused under the comprehensive impact of complex load condition, temperature stress and mechanical stress of coke drums, which is a serious threat to safety production. The development and application of coke drum structural health monitoring system ensures the healthy operation of the equipment, and will effectively cope with the increasing long-term operation requirements of refining and chemical enterprises. Based on the stress monitoring data of the key parts of the coke drum, as well as the operating pressure and temperature data, this paper analyzes the characteristics of coke drum structure monitoring data and the causes of circumferential weld cracking of coke drum structure. The residual life of the monitored structure is evaluated by using the improved rain flow counting statistical method and miner fatigue cumulative damage theory. Finally, the contribution rate of different process sections of coke drum to its structural damage is analyzed. This study provides a reference for structural health monitoring and operation process optimization of coke drum.