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Flow field and thermal characteristics in a model of a tangentially fired furnace under different conditions of burner tripping

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Abstract

Tangentially fired furnaces are vortex-combustion units and are widely used in steam generators of industrial plants. The present study provides a numerical investigation of the problem of turbulent reacting flows in a model furnace of a tangentially fired boiler. The importance of this problem is mainly due to its relation to large boiler furnaces used in thermal power plants. In the present work, calculation of the flow field, temperature and species concentration-contour maps in a tangentially-fired model furnace are provided. The safety of these furnaces requires that the burner be tripped (its fuel is cut off) if the flame is extinguished. Therefore, the present work provides an investigation of the influence of number of tripped burners on the characteristics of the flow and thermal fields. The details of the flow, thermal and combustion fields are obtained from the solution of the conservation equations of mass, momentum and energy and transport equations for scalar variables in addition to the equations of the turbulence model. Available experimental measurements were used for validating the calculation procedure. The results show that the vortex created due to pressure gradient at the furnace center only influenced by tripping at least two burners. However, the temperature distributions are significantly distorted by tripping any of the burners. Regions of very high temperature close to the furnace walls appear as a result of tripping the fuel in one or two of the burners. Calculated heat flux along the furnace walls are presented.

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Abbreviations

A/F:

Air-to-fuel ratio on a mass basis

C 1 :

Constant (Eq. 6)

C2, C3:

Constant (Eq. 8)

C μ :

Constant (Eq. 4)

D :

Diameter of the furnace used to present validation, diffusivity coefficient of species

d i :

Inner diameter of air annulus

d f :

Diameter of fuel nozzle

d o :

Outer diameter of air annulus

G :

Generation of kinetic energy of turbulence

I :

Total radiation intensity

J :

Diffusion flux of species

k :

Kinetic energy of turbulence

m i :

Mass of species

P :

Pressure

R :

Mass rate of reaction

T :

Temperature

S :

Source term

\(\mathop U\limits^{\_\_} \) :

Mean velocity

u :

Fluctuating velocity component

W :

Width of the furnace, 0.5 m

x, y:

Coordinates of the furnace cross-section measured from the center of the furnace

X+:

Wall at x=0.5 W

X−:

Wall at x=−0.5 W

Y+:

Wall at y=0.5 W

Y−:

Wall at y=−0.5 W

z :

Axial distance of furnace measured from level of burners

ɛ:

Dissipation rate of turbulent kinetic energy

μ:

Dynamic viscosity

κ:

Absorption coefficient

λ:

Wavelength

Φ:

Dependent variable

ϕ:

Fluctuation in the dependent variable Φ

ρ:

Average density

σ k :

Effective Prandtl number for k

σɛ:

Effective Prandtl number for ɛ

θ:

Angle of burner inclination

–:

Time average

b:

Blackbody

eff:

Effective

k:

Turbulent kinetic energy

λ:

Wavelength

Φ:

Dependent variable

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Acknowledgement

The support of King Fahd University for this research work is acknowledged.

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Authors and Affiliations

  1. Mechanical Engineering Department, King Fahd University of Petroleum & Minerals, Dhahran, 31261, Saudi Arabia

    M. A. Habib, R. Ben-Mansour & M. A. Antar

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  1. M. A. Habib
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  2. R. Ben-Mansour
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  3. M. A. Antar
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Correspondence to M. A. Habib.

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Habib, M.A., Ben-Mansour, R. & Antar, M.A. Flow field and thermal characteristics in a model of a tangentially fired furnace under different conditions of burner tripping. Heat Mass Transfer 41, 909–920 (2005). https://doi.org/10.1007/s00231-004-0593-6

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  • DOI: https://doi.org/10.1007/s00231-004-0593-6

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