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Modeling the coke formation in the convection section tubes of a steam cracker

Sandra De Schepper (UGent) , Geraldine Heynderickx (UGent) and Guy Marin (UGent)
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Abstract
The presence of liquid hydrocarbon droplets in the convection section of a steam cracker may cause serious fouling problems due to coke formation, especially in high temperature zones. In order to investigate these fouling problems, a model has been developed and implemented in a CFD code to accurately simulate the behavior of a hydrocarbon droplet impinging on a hot surface. The impact energy of the droplet and the hot surface temperature are found to determine the impact behavior. On the basis of the newly developed model, the positions where droplets preferentially collide with the convection section tube walls and liquid material is deposited are determined. Furthermore, a kinetic model describing coke formation out of liquid hydrocarbon droplets in the temperature range of 450-700 K has been developed to calculate the rate of coke formation in each zone of the convection section tube. The calculated coke layer thickness on the most vulnerable tube locations and the industrially available values correspond remarkably well.
Keywords
EVAPORATION, RELATIVE RATES, HYDROCARBONS, GAS, WALL, FLOW, FUELS, LIQUID, SIMULATION, RUN-LENGTH

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Chicago
De Schepper, Sandra, Geraldine Heynderickx, and Guy Marin. 2010. “Modeling the Coke Formation in the Convection Section Tubes of a Steam Cracker.” Industrial & Engineering Chemistry Research 49 (12): 5752–5764.
APA
De Schepper, Sandra, Heynderickx, G., & Marin, G. (2010). Modeling the coke formation in the convection section tubes of a steam cracker. INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH, 49(12), 5752–5764.
Vancouver
1.
De Schepper S, Heynderickx G, Marin G. Modeling the coke formation in the convection section tubes of a steam cracker. INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH. 2010;49(12):5752–64.
MLA
De Schepper, Sandra, Geraldine Heynderickx, and Guy Marin. “Modeling the Coke Formation in the Convection Section Tubes of a Steam Cracker.” INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH 49.12 (2010): 5752–5764. Print.
@article{1054945,
  abstract     = {The presence of liquid hydrocarbon droplets in the convection section of a steam cracker may cause serious fouling problems due to coke formation, especially in high temperature zones. In order to investigate these fouling problems, a model has been developed and implemented in a CFD code to accurately simulate the behavior of a hydrocarbon droplet impinging on a hot surface. The impact energy of the droplet and the hot surface temperature are found to determine the impact behavior. On the basis of the newly developed model, the positions where droplets preferentially collide with the convection section tube walls and liquid material is deposited are determined. Furthermore, a kinetic model describing coke formation out of liquid hydrocarbon droplets in the temperature range of 450-700 K has been developed to calculate the rate of coke formation in each zone of the convection section tube. The calculated coke layer thickness on the most vulnerable tube locations and the industrially available values correspond remarkably well.},
  author       = {De Schepper, Sandra and Heynderickx, Geraldine and Marin, Guy},
  issn         = {0888-5885},
  journal      = {INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH},
  keywords     = {EVAPORATION,RELATIVE RATES,HYDROCARBONS,GAS,WALL,FLOW,FUELS,LIQUID,SIMULATION,RUN-LENGTH},
  language     = {eng},
  number       = {12},
  pages        = {5752--5764},
  title        = {Modeling the coke formation in the convection section tubes of a steam cracker},
  url          = {http://dx.doi.org/10.1021/ie100091e},
  volume       = {49},
  year         = {2010},
}

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