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Impact of flue gas radiative properties and burner geometry in furnace simulations

Yu Zhang (UGent) , Carl Schietekat (UGent) , Q feng, Kevin Van Geem (UGent) and Guy Marin (UGent)
(2015) AICHE JOURNAL. 61(3). p.936-954
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Abstract
Three fully coupled Computational Fluid Dynamics (CFD) simulations of a complete industrial steam cracking furnace equipped with floor burners are performed. The influence of the flue gas radiative properties and burner geometry on the flame front in the firebox, the heat transfer to the coils and the product selectivities has been investigated. A nine-band model developed from the Exponential Wide Band Model (EWBM) is used as nongray gas radiation model to compare with the gray gas implementation of Weighted Sum of Gray Gas Model for the evaluation of the flue gas radiative properties. The gray gas radiation model predicts a flue gas outlet temperature that is 70 K lower than the temperature obtained with the nongray gas radiation model, resulting in a 3.6% higher thermal efficiency and 44 K higher average Coil Outlet Temperature (COT). Important differences between the 22 reactors in the furnace are seen because of shadow effects with and without accounting for the detailed burner geometry. The maximum difference between the COT of different reactors in the furnace caused by shadow effects is about 29 K which corresponds to a propene-over-ethene difference of 0.1. Full furnace CFD simulations prove thus to be essential in design and during debottlenecking, when aiming for a more uniform COT distribution to the reactors by feed or fuel distribution. (c) 2015 American Institute of Chemical Engineers AIChE J, 2015 2014 American Institute of Chemical Engineers AIChE J, 61: 936-954, 2015
Keywords
THERMAL-CRACKING, STEAM CRACKING FURNACES, 3-DIMENSIONAL FLOW, MOLECULAR SPECTROSCOPIC DATABASE, HIGH-EMISSIVITY COATINGS, FINITE-VOLUME METHOD, WIDE-BAND MODEL, HEAT-TRANSFER, COMBUSTION MECHANISMS, NUMERICAL-SIMULATION, steam cracking, computational fluid dynamics, heat transfer, gas radiative properties, shadow effect

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Citation

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Chicago
Zhang, Yu, Carl Schietekat, Q feng, Kevin Van Geem, and Guy Marin. 2015. “Impact of Flue Gas Radiative Properties and Burner Geometry in Furnace Simulations.” Aiche Journal 61 (3): 936–954.
APA
Zhang, Yu, Schietekat, C., feng, Q., Van Geem, K., & Marin, G. (2015). Impact of flue gas radiative properties and burner geometry in furnace simulations. AICHE JOURNAL, 61(3), 936–954.
Vancouver
1.
Zhang Y, Schietekat C, feng Q, Van Geem K, Marin G. Impact of flue gas radiative properties and burner geometry in furnace simulations. AICHE JOURNAL. 2015;61(3):936–54.
MLA
Zhang, Yu, Carl Schietekat, Q feng, et al. “Impact of Flue Gas Radiative Properties and Burner Geometry in Furnace Simulations.” AICHE JOURNAL 61.3 (2015): 936–954. Print.
@article{5923156,
  abstract     = {Three fully coupled Computational Fluid Dynamics (CFD) simulations of a complete industrial steam cracking furnace equipped with floor burners are performed. The influence of the flue gas radiative properties and burner geometry on the flame front in the firebox, the heat transfer to the coils and the product selectivities has been investigated. A nine-band model developed from the Exponential Wide Band Model (EWBM) is used as nongray gas radiation model to compare with the gray gas implementation of Weighted Sum of Gray Gas Model for the evaluation of the flue gas radiative properties. The gray gas radiation model predicts a flue gas outlet temperature that is 70 K lower than the temperature obtained with the nongray gas radiation model, resulting in a 3.6\% higher thermal efficiency and 44 K higher average Coil Outlet Temperature (COT). Important differences between the 22 reactors in the furnace are seen because of shadow effects with and without accounting for the detailed burner geometry. The maximum difference between the COT of different reactors in the furnace caused by shadow effects is about 29 K which corresponds to a propene-over-ethene difference of 0.1. Full furnace CFD simulations prove thus to be essential in design and during debottlenecking, when aiming for a more uniform COT distribution to the reactors by feed or fuel distribution. (c) 2015 American Institute of Chemical Engineers AIChE J, 2015 2014 American Institute of Chemical Engineers AIChE J, 61: 936-954, 2015},
  author       = {Zhang, Yu and Schietekat, Carl and feng, Q and Van Geem, Kevin and Marin, Guy},
  issn         = {0001-1541},
  journal      = {AICHE JOURNAL},
  keyword      = {THERMAL-CRACKING,STEAM CRACKING FURNACES,3-DIMENSIONAL FLOW,MOLECULAR SPECTROSCOPIC DATABASE,HIGH-EMISSIVITY COATINGS,FINITE-VOLUME METHOD,WIDE-BAND MODEL,HEAT-TRANSFER,COMBUSTION MECHANISMS,NUMERICAL-SIMULATION,steam cracking,computational fluid dynamics,heat transfer,gas radiative properties,shadow effect},
  language     = {eng},
  number       = {3},
  pages        = {936--954},
  title        = {Impact of flue gas radiative properties and burner geometry in furnace simulations},
  url          = {http://dx.doi.org/10.1002/aic.14724},
  volume       = {61},
  year         = {2015},
}

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