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Dynamic Simulation of the Ammonia Tank Failure at Pardis Petrochemical Company

Farhadi, Zeinab | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 47016 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Rashtchian, Davood
  7. Abstract:
  8. Liquid ammonia atmospheric tank (20000 ton) attached to Pardis Petrochemical Complex was ruptured on 8th August 2011 due to overpressure blast injury so that ammonia gas was spread throughout the complex. The current study was aimed to evaluate ammonia leakage and emission from the tank. For this purpose, in addition to evaluate ammonia emission into the air, pressure changes were investigated to simulate the rupture. First of all, ammonia tanks and urea stocks were simulated and then considering two aerial classes (D and B), the incident was stimulated. According to this model, up to 1000 m, was contaminated with 1000 ppm of ammonia. Since there was no experimental data for validating the results, FLADIS test was simulated and data were compared with experimental results. The results indicated that there was a good accordance between selected method and experimental results. During the second part, several phase change methods, presented in CFD complexes, were studied and advantages and disadvantages were identified. At first, PHASE FIELD was expressed. Although this method has many benefits, it was not applicable for large scales; therefore, MIXTURE method was selected. For this purpose, similar scale was created and then two different conditions, heating from the bottom and simulated environmental conditions (temperature rise) were investigated. Using this method, the maximum time to response to created condition can be calculated. Under similar circumstances, pressure reached to 240 Mbarg for 220 s, while the real pressure on the day of incident was 180 s, the pressure can injure the tank seriously
  9. Keywords:
  10. Ammonia ; Computational Fluid Dynamics (CFD) ; Ammonia Tank ; Tank Rupture ; Phase Changing Methods ; Transmittal ; Pardis Petrochemical

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