The numerical simulations of reactive turbulent flows and heat transfer in an industrial slab reheat furnace in which the combustion air is highly preheated have been carried out. The influence of the ratio of the air and fuel injection velocities on the NOx production rate in the furnace has also been studied numerically. A moment closure method with the assumed β probability density function (PDF) for mixture fraction was used in the present work to model the turbulent non-premixed combustion process in the furnace. The combustion model was based on the assumption of instantaneous full chemical equilibrium. The turbulence was modeled by the standard k-ε model with a wall function. The numerical simulations have provided complete information on the flow, heat, and mass transfer in the furnace. The results also indicate that a low NOx emission and high heating efficiency can be achieved in the slab reheat furnace by using low NOx regenerative burners. It is found that the air/fuel injection velocity ratio has a strong influence on the NOx production rate in the furnace.

1.
Al-Fawaz, A. D., Dearden, L. M., Hedley, J. T., Missaghi, M., Fourkashanian, M., Williams, A., and Yap, L. T., 1994, “NOx Formation in Geometrically Scaled Gas-Fired Industrial Burners,” Proceedings, 25th Symposium (International) on Combustion, The Combustion Institute, pp. 1027–1034.
2.
Bowman, C. T., 1991, “Chemistry of Gaseous Pollutant Formation and Destruction,” Fossil Fuel Combustion—A Source Book, eds., W. Bartok and A. F. Sarofim.
3.
Buch, K. A., Dahm, W. J. A., Dibble, R. W., and Barlow, R. S., 1992, “Structure of Equilibrium Reaction Rate Fields in Turbulent Jet Diffusion Flames,” Proceedings, 24th Symposium (International) on Combustion, The Combustion Institute, pp. 295–301.
4.
Chen
C.
,
Chang
K.
, and
Chen
J.
,
1994
, “
Application of a Robust β-pdf Treatment to Analysis of Thermal NO Formation in Nonpremixed Hydrogen-Air Flame
,”
Combustion and Flame
, Vol.
98
, pp.
375
390
.
5.
Chen
J.
, and
Kollmann
W.
,
1990
, “
Chemical Models for PDF Modeling of Hydrogen-Air Nonpremixed Turbulent Flames
,”
Combustion and Flame
, Vol.
79
, pp.
75
99
.
6.
Cheng
P.
,
1964
, “
Two Dimensional Radiating Gas Flow by a Moment Method
,”
AIAA Journal
, Vol.
2
, pp.
1662
1664
.
7.
Cook, D. K., 1990, “An Integral Model of Turbulent Non-Premixed Jet Flames in a Cross Flow,” Proceedings, 23rd Symposium (International) on Combustion, The Combustion Institute, pp. 653–660.
8.
De Soete, G. G., 1975, “Overall Reaction Rates of NO and N2 Formation from Fuel Nitrogen,” Proceedings, 15th Symposium (International) on Combustion, The Combustion Institute, p. 1093.
9.
Gaffney, Jr., R. L., Girimaji, S. S., and Drummond, J. P., 1992, “Modeling Turbulent/Chemistry Interactions Using Assumed PDF Methods,” 25th Joint Propulsion Conference and Exhibit, AIAA/SAE/ASME/ASEE, Nashville, TN, July 6–8.
10.
Hanson, R. K., and Salimain, S., 1984, “Survey of Rate Constants in H/N/O System,” Combustion Chemistry, W. C. Gardiner, ed., p. 361.
11.
Launder
B. E.
, and
Spalding
D. B.
,
1974
, “
The Numerical Computation of Turbulent Flows
,”
Computer Methods in Applied Mechanics and Engineering
, Vol.
3
, pp.
269
289
.
12.
Patankar, S. V., 1980, Numerical Heat Transfer and Fluid Flow, Hemisphere Publishing Co., Washington, DC.
13.
Peters
A. A. F.
, and
Weber
R.
,
1995
, “
Mathematical Modeling of a 2.25 MW, Swirling Natural Gas Flame. Par 1: Eddy Break-up Concept for Turbulent Combustion; Probability Density Function Approach for Nitric Oxide Formation
,”
Combustion Science and Technology
, Vol.
110–111
, pp.
67
101
.
14.
Pope
S. B.
,
1981
, “
A Monte Carlo Method for the PDF Equations of Turbulent Reactive Flow
,”
Combustion Science and Technology
, Vol.
25
, pp.
159
174
.
15.
Rich, L. V., 1989, “Regenerative Burners in Reheat Furnaces,” Iron and Steel Engineer, Oct., pp. 46–52.
16.
Smith, N. S. A., Bilger, R. W., and Chen, J., 1992, “Modelling of Nonpremixed Hydrogen Jet Flames Using a Conditional Moment Closure Method,” Proceedings, 24th Symposium (International) on Combustion, The Combustion Institute, pp. 263–269.
17.
Tomeczek, J., Goral, J., and Gradon, B., 1994, “Influence of Gasdynamics on NOx Emission from Large Diffusion Natural Gas Flames,” Proceedings, 25th Symposium (International) on Combustion, The Combustion Institute, pp. 1035–1041.
18.
van Doormaal
J. P.
, and
Raithby
G. D.
,
1984
, “
Enhancements of the SIMPLE Method for Predicting Incompressible Fluid Flows
,”
Numerical Heat Transfer
, Vol.
17
, pp.
147
163
.
19.
Warnatz, J., 1991, “NOx Formation in High Temperature Processes,” Proceedings, European Gas Conference, pp. 303–320.
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