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Research Papers: Heat Transfer in Manufacturing

Coupled Heat Transfers in a Refinery Furnace in View of Fouling Prediction

[+] Author and Article Information
T. Pedot

CERFACS,
42 Avenue G. Coriolis,
Toulouse 31170, France
e-mail: thomas.pedot@gmail.com

B. Cuenot

CERFACS,
42 Avenue G. Coriolis,
Toulouse 31170, France
e-mail: cuenot@cerfacs.fr

E. Riber

CERFACS,
42 Avenue G. Coriolis,
Toulouse 31057, France
e-mail: riber@cerfacs.fr

T. Poinsot

CERFACS and IMFT,
2 Al. Pr. C. Soula,
Toulouse 31400, France
e-mail: poinsot@cerfacs.fr

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received June 8, 2015; final manuscript received March 9, 2016; published online April 12, 2016. Assoc. Editor: Laurent Pilon.

J. Heat Transfer 138(7), 072101 (Apr 12, 2016) (10 pages) Paper No: HT-15-1409; doi: 10.1115/1.4033096 History: Received June 08, 2015; Revised March 09, 2016

In industrial refinery furnaces, the efficiency of thermal transfer to heat crude oil before distillation is often altered by coke deposition inside the fuel pipes. This leads to increased production and maintenance costs, and requires better understanding and control. Crude oil fouling is a chemical reaction that is, at first order, thermally controlled. In such large furnaces, the predominant heat transfer process is thermal radiation by the hot combustion products, which directly heats the pipes. As radiation fluxes depend on temperature differences, the pipe surface temperature also plays an important role and needs to be predicted with sufficient accuracy. This pipe surface temperature results from the energy balance between thermal radiation, convective heat transfer, and conduction in the solid material of the pipe, meaning that the thermal behavior of the whole system is a coupled radiation–convection–conduction problem. In this work, this coupled problem is solved in a cylindrical furnace, in which the crude oil flowing in vertical pipes is heated. The thermal radiation of combustion gases is modeled using the discrete ordinate method (DOM) with accurate spectral models and is coupled to heat conduction in the pipe to predict its wall temperature. The flame is described with a complex chemistry combustion model. An energy balance confirms that heat transfers are effectively dominated by thermal radiation. Good agreement with available measurements of the radiative heat flux on a real furnace shows that the proposed approach predicts the correct heat transfers to the pipe. This allows an accurate prediction of the temperature field on the pipe surface, which is a key parameter for liquid fouling inside the pipe. This shows that the thermal problem in furnaces can be handled with relatively simple models with good accuracy.

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References

Thackery, P. , 1979, “ The Cost of Fouling in Heat Exchange Plant,” Effluent Water Treat. J., 20(3), pp. 111–115.
Garrett-Price, B. , 1985, Fouling of Heat Exchangers: Characteristics, Costs, Prevention, Control and Removal, Noyes Publications, Saddle River, NJ.
Pilavachi, P. , and Isdale, J. , 1993, “ European Community R&D Strategy in the Field of Heat Exchanger Fouling: Projects,” Heat Recovery Syst. CHP, 13(2), pp. 133–138. [CrossRef]
Zhi-Ming, X. , and Zhong-Bin, Z. , 2008, “ Costs Due to Utility Fouling in China,” Heat Exchanger Fouling and Cleaning VII, Stuttgart, Germany, July 1–7.
Sheikh, A. , Zubair, S. , Younas, M. , and Budair, M. , 2000, “ A Risk Based Heat Exchanger Analysis Subject to Fouling: Part II: Economics of Heat Exchangers Cleaning,” Energy, 25(5), pp. 445–461. [CrossRef]
Ishiyama, E. , Paterson, W. , and Wilson, D. , 2008, “ The Effect of Fouling on Heat Transfer, Pressure Drop and Throughput in Refinery Preheat Trains: Optimisation of Cleaning Schedules,” Heat Transfer Eng., 30(10–11), p. 805814.
Epstein, N. , 1983, “ Thinking About Heat Transfer Fouling: A 5 × 5 Matrix,” Heat Transfer Eng., 4(1), pp. 43–56. [CrossRef]
Asomaning, S. , 1997, “ Heat Exchanger Fouling by Petroleum Asphaltenes,” Ph.D. dissertation, University of British Columbia, Vancouver, BC, Canada.
Saleh, Z. , and Sheikholeslami, R. , 2004, “ Fouling Characteristics of a Light Australian Crude Oil,” Heat Transfer Eng., 26(1), p. 1522.
Srinivasan, M. , and Watkinson, A. , 2005, “ Fouling of Some Canadian Crude Oils,” Heat Transfer Eng., 26(1), pp. 7–14. [CrossRef]
Crittenden, B. , Kolaczkowski, S. , and Downey, I. , 1992, “ Fouling of Crude Oil Preheat Exchangers,” Chem. Eng. Res. Des., 70(6), pp. 547–557.
Zubair, S. , Sheikh, A. , Younas, M. , and Budair, M. , 2000, “ A Risk Based Heat Exchanger Analysis Subject to Fouling: Part I: Performance Evaluation,” Energy, 25(5), pp. 427–443. [CrossRef]
Niaei, A. , Towfighi, J. , Sadrameli, S. , and Karimzadeh, R. , 2004, “ The Combined Simulation of Heat Transfer and Pyrolysis Reactions in Industrial Cracking Furnaces,” Appl. Therm. Eng., 24(14–15), pp. 2251–2265. [CrossRef]
Bahadori, A. , and Vuthaluru, H. B. , 2010, “ Novel Predictive Tools for Design of Radiant and Convective Sections of Direct Fired Heaters,” Appl. Energy, 87(7), pp. 2194–2202. [CrossRef]
Stefanidis, G. , Merci, B. , Heynderickx, G. , and Marin, G. , 2006, “ CFD Simulations of Steam Cracking Furnaces Using Detailed Combustion Mechanisms,” Comput. Chem. Eng., 30(4), pp. 635–649. [CrossRef]
Oprins, A. , and Heynderickx, G. , 2003, “ Calculation of Three-Dimensional Flow and Pressure Fields in Cracking Furnaces,” Chem. Eng. Sci., 58(21), pp. 4883–4893. [CrossRef]
Heynderickx, G. , Oprins, A. , Marin, G. B. , and Dick, E. , 2001, “ Three-Dimensional Flow Patterns in Cracking Furnaces With Long-Flame Burners,” AIChE J., 47(2), pp. 388–400. [CrossRef]
Habibi, A. , Merci, B. , and Heynderickx, G. , 2007, “ Impact of Radiation Models in CFD Simulations of Steam Cracking Furnaces,” Comput. Chem. Eng., 31(11), pp. 1389–1406. [CrossRef]
Lan, X. , Gao, J. , Xu, C. , and Zhang, H. , 2007, “ Numerical Simulation of Transfer and Reaction Processes in Ethylene Furnaces,” Chem. Eng. Res. Des., 85(12), pp. 1565–1579. [CrossRef]
Hu, G. , Wang, H. , Qian, F. , Geem, K. V. , Schietekat, C. , and Marin, G. , 2012, “ Coupled Simulation of an Industrial Naphtha Cracking Furnace Equipped With Long-Flame and Radiation Burners,” Comput. Chem. Eng., 38, pp. 24–34. [CrossRef]
Morales-Fuentes, A. , Picón-Núñez, M. , Polley, G. , and Méndez-Díaz, S. , 2014, “ Analysis of the Influence of Operating Conditions on Fouling Rates in Fired Heaters,” Appl. Therm. Eng., 62(2), pp. 777–784. [CrossRef]
Jegla, Z. , Vondál, J. , and Hájek., J. , 2015, “ Standards for Fired Heater Design: An Assessment Based on Computational Modelling,” Appl. Therm. Eng., 89, pp. 1068–1078. [CrossRef]
Wang, L. , and Pitsch, H. , 2007, “ Large-Eddy Simulation of an Industrial Furnace With a Cross-Flow-Jet Combustion System,” Center for Turbulence Research, Annual Research Briefs, pp. 231–240.
Coelho, P. , and Carvalho, M. , 1997, “ A Conservative Formulation of the Discrete Transfer Method,” ASME J. Heat Transfer, 119(1), pp. 118–128. [CrossRef]
Koch, R. , Krebs, W. , Wittig, S. , and Viskanta, R. , 1995, “ Discrete Ordinates Quadrature Schemes for Multidimensional Radiative Transfer,” J. Quant. Spectrosc. Radiat. Transfer, 53(4), pp. 353–372. [CrossRef]
Fiveland, W. , 1984, “ Discrete-Ordinates Solutions of the Radiative Transport Equation for Rectangular Enclosures,” ASME J. Heat Transfer, 106(4), p. 699706. [CrossRef]
Raithby, G. , 1990, “ A Finite-Volume Method for Predicting a Radiant Heat Transfer in Enclosures With Participating Media,” ASME J. Heat Transfer, 112(2), p. 415423. [CrossRef]
Amaya, J. , Cabrit, O. , Poitou, D. , Cuenot, B. , and Hafi, M. E. , 2010, “ Unsteady Coupling of Navier–Stokes and Radiative Heat Transfer Solvers Applied to an Anisothermal Multicomponent Turbulent Channel Flow,” J. Quant. Spectrosc. Radiat. Transfer, 111(2), pp. 295–301. [CrossRef]
Joseph, D. , Perez, P. , Hafi, M. E. , and Cuenot, B. , 2009, “ Discrete Ordinates and Monte Carlo Methods for Radiative Transfer Simulation Applied to Computational Fluid Dynamics Combustion Modeling,” ASME J. Heat Transfer, 131(5), p. 052701. [CrossRef]
Liu, F. , Becker, H. , and Bindar, Y. , 1998, “ A Comparative Study of Radiative Heat Transfer Modelling in Gas-Fired Furnaces Using the Simple Grey Gas and the Weighted-Sum-of-Grey-Gases Models,” Int. J. Heat Mass Transfer, 41(22), pp. 3357–3371. [CrossRef]
Claramunt, K. , Consul, R. , Carbonell, D. , and Perez-Segarra, C. , 2006, “ Analysis of the Laminar Flamelet Concept for Nonpremixed Laminar Flames,” Combust. Flame, 145(4), pp. 845–862. [CrossRef]
Fiorina, B. , Gicquel, O. , Vervisch, L. , Carpentier, S. , and Darabiha, N. , 2005, “ Approximating the Chemical Structure of Partially Premixed and Diffusion Counterflow Flames Using FPI Flamelet Tabulation,” Combust. Flame, 140(3), pp. 147–160. [CrossRef]
Liu, F. , Guo, H. , and Smallwood, G. , 2006, “ Evaluation of the Laminar Diffusion Flamelet Model in the Calculation of an Axisymmetric Coflow Laminar Ethylene-Air Diffusion Flame,” Combust. Flame, 144(3), pp. 605–618. [CrossRef]
Bilger, R. , Starner, S. , and Kee, R. , 1990, “ On Reduced Mechanisms for Methane—Air Combustion in Nonpremixed Flames,” Combust. Flame, 80(2), pp. 135–149. [CrossRef]
Bilger, R. , 2010, “ A Mixture Fraction Framework for the Theory and Modeling of Droplets and Sprays,” Combust. Flame, 158(6), p. 191202.
Poinsot, T. , and Veynante, D. , 2005, Theoretical and Numerical Combustion, RT Edwards, Philadelphia, PA, p. 522.
Bilger, R. W. , Yip, B. , Long, M. B. , and Masri, A. R. , 1990, “ An Atlas of QEDR Flame Structures,” Combust. Sci. Technol., 72(4–6), pp. 137–155. [CrossRef]
Abramowitz, M. , and Stegun, I. , 1972, Handbook of Mathematical Functions: With Formulas, Graphs, and Mathematical Tables (National Bureau of Standards Applied Mathematics Series 55), 10th printing, Dover, New York.
Barlow, R. S. , Franck, J. , Karpetis, A. , and Chen, J.-Y. , 2005, “ Piloted Methane/Air Jet Flames: Transport Effects and Aspects of Scalar Structure,” Combust. Flame, 143(4), pp. 433–449. [CrossRef]
Bilger, R. W. , 1988, “ The Structure of Turbulent Non Premixed Flames,” Symp. (Int.) Combust., pp. 475–488.
Goodwin, D. G. , 2009, Cantera code site.
Poitou, D. , 2009, “ Modélisation du rayonnement dans la simulation aux grandes échelles de la combustion turbulente,” Ph.D. thesis, INPT, Toulouse, France.
Joseph, D. , Hafi, M. E. , Fournier, R. , and Cuenot, B. , 2005, “ Comparison of Three Spatial Differencing Schemes in Discrete Ordinates Method Using Three-Dimensional Unstructured Meshes,” Int. J. Therm. Sci., 44(9), pp. 851–864. [CrossRef]
Truelove, J. , 1987, “ Discrete-Ordinate Solutions of the Radiation Transport Equation,” ASME J. Heat Transfer, 109(4), pp. 1048–1051.
Lebedev, V. , 1975, “ Values of the Nodes and Weights of Ninth to Seventeenth Order Gauss–Markov Quadrature Formulae Invariant Under the Octahedron Group With Inversion,” USSR Comput. Math. Math. Phys., 15(1), pp. 44–51.
Carlson, B. , and Lathrop, K. , 1968, “ Transport Theory—The Method of Discrete Ordinates,” Computing Methods in Reactors Physics, Gordon and Breach, New York.
Amaya, J. , 2010, “ Unsteady Coupled Convection, Conduction and Radiation Simulations on Parallel Architectures for Combustion Applications,” Ph.D. thesis, INPT, Toulouse, France.
Koch, R. , and Becker, R. , 2004, “ Evaluation of Quadrature Schemes for the Discrete Ordinates Method,” J. Quant. Spectrosc. Radiat. Transfer, 84(4), pp. 423–435. [CrossRef]
Duchaine, F. , Corpron, A. , Pons, L. , Moureau, V. , Nicoud, F. , and Poinsot, T. , 2009, “ Development and Assessment of a Coupled Strategy for Conjugate Heat Transfer With Large Eddy Simulation. Application to a Cooled Turbine Blade,” Int. J. Heat Fluid Flow, 30(6), pp. 1129–1141. [CrossRef]
Kays, W. , Crawford, M. , and Weigand, B. , 1993, Convective Heat and Mass Transfer, McGraw-Hill, New York.
Bejan, A. , and Kraus, A. , 2003, Heat Transfer Handbook, Wiley, Hoboken NJ.
Lienhard, J. , Eichhorn, R. , and Lienhard, J. , 1987, A Heat Transfer Textbook, Phlogiston Press, Cambridge MA.
Oosthuizen, P. , and Naylor, D. , 1999, An Introduction to Convective Heat Transfer Analysis, William C. Brown Pub., Dubuque, IA.
Viskanta, R. , and Mengüç, M. P. , 1987, “ Radiation Heat Transfer in Combustion Systems,” Prog. Energy Combust. Sci., 13(2), pp. 97–160. [CrossRef]
Pedot, T. , 2012, “ Modelisation du couplage thermique entre la combustion et l'encrassement des tubes dans un four de raffinerie,” Ph.D. thesis, INPT, Toulouse, France.
Enomoto, H. , Tsai, Y. , and Essenhigh, R. , 1975, “ Heat Transfer in a Continuous Model Furnace: A Comparison of Theory and Experiment,” ASME Paper No. 75-HT-5.
Hottel, H. , and Sarofim, A. F. , 1967, Hottel and Sarofim Radiative Transfer, McGraw-Hill Book Company, New York.
Wauters, S. , and Marin, G. B. , 2002, “ Kinetic Modeling of Coke Formation During Steam Cracking,” Ind. Eng. Chem. Res., 41(10), pp. 2379–2391. [CrossRef]

Figures

Grahic Jump Location
Fig. 1

Left: Sketch of a typical cylindrical refinery furnace. Right: Sketch of the different energy contributions in the radiant section.

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Fig. 2

Sketch of heat fluxes budget to the pipes

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Fig. 3

Axisymmetric diffusion jet flame configuration

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Fig. 4

Coupling algorithm to solve the thermal problem

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Fig. 5

Left: Cross-sectional view of the Feyzin furnace. Right: Sketch of the oil flow path in one-quarter of the Feyzin furnace (vertical expanded view).

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Fig. 6

Fields of temperature (left), CO2 (middle), and radiative source term (right) of the jet flame computed with CANDLE in a vertical plane cut. Stoichiometric line is drawn in white. ⊗ symbols locate incident radiative flux probes.

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Fig. 7

Structure of the diffusion flame at atmospheric pressure computed with grimech 3.0 full chemistry and transport: temperature (left scale) and main species molar fraction (right scale) profiles. Strain rate is 105 s−1. The vertical dashed line marks the stoichiometric mixture fraction zst.

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Fig. 8 Left

Radial profiles of temperature, radiative source term, and net radiative flux at x=3 m. Right: Incident radiative heat flux: simulation versus measurements.

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Fig. 9

Net radiative flux and pipe wall temperature along a path (tubes 1–20)

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Fig. 10

Net heat flux on a pipe section (tube 2) versus angle at four different heights; 0 deg (respectively, 180 deg) defines the highest exposure to the flame (respectively, refractory furnace wall)

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Fig. 11

Net heat flux on a pipe section (tube 20) versus angle at four different heights; 0 deg (respectively, 180 deg) defines the highest exposure to the flame (respectively, refractory wall)

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