Numerical simulation and experimental study on venting behaviors of di-tertbutyl peroxide in pressure vessel

摘要

Venting is of great importance to avoid the overpressure explosion accidents in chemical industry. In order to study the venting characteristics of Di-tertbutyl peroxide (DTBP) caused by thermal decomposition in a pressure vessel, both computational fluid dynamics (CFD) simulation and pressure vessel tests (PVT) were carried out. Based on kinetic model of DTBP evaluated by differential scanning calorimeter (DSC) tests and non-linear optimization method, CFD simulation was performed to visualize the fluid dynamic behavior and distribution of different parameters during the venting process. PVT experiments were implemented to verify the numerical simulation. The results showed that the pressure and temperature in the vessel increased during DTBP decomposition process. After fracture of the rupture disc, the internal temperature and pressure dropped rapidly, and a high-speed flow appeared near the vent. During the venting process, due to the inertia of the airflow, negative pressure was generated in the vessel, and the pressure was oscillating until the standard atmospheric pressure was reached. The simulated results were in reasonable agreement with the experimental results, thereby proving the validity and reliability of the numerical simulation.