Radiation from products of combustion

Modak, Ashok T.

doi:10.1016/0379-7112(79)90004-3

Cited by 49 publications

(27 citation statements)

References 12 publications

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“…The solution of the RTE for this application was obtained using the discrete ordinates (DO) radiation model [48]. The blackbody spectral emissive power is calculated through using variables by Liu et al [49] and Zheng et al [4] based on expressions of Modak [50] and Smith et al [51]. Accordingly, both the heat transfer by convection and radiation are considered for all the elements inside the furnace including the superheaters (radiative, platen and convective sections), reheaters, furnace walls and economizer.…”

Section: The Governing Equationsmentioning

confidence: 99%

Thermal and emission characteristics in a tangentially fired boiler model furnace

Habib¹,

Ben‐Mansour²,

Abualhamayel³

2009

Int. J. Energy Res.

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SUMMARYTangentially fired furnaces are vortex-combustion units and are intended for use as low NO formation furnaces. NO characteristics inside these furnaces depend on many parameters. The present study investigates numerically the problem of pollution in a real furnace of a 1699 MW tangentially fired boiler having 32 burners. NO formation contour maps in a tangentially fired furnace are presented. The study covered different combustion air temperature values, different fuel-air ratios and different cases of tripped burners. Available experimental measurements were used for validating the calculation procedure. The details of the temperature and NO fields were 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. The equations governing the NO formation were solved to calculate the NO distribution. The simulation provided more insight on the correlation between the total NO concentration and the maximum furnace temperature and furnace average temperature. The results have shown that the furnace average temperature and NO concentration decrease as the excess air factor increases for a given air mass flow rate. As the combustion air temperature increases, furnace temperature increases and the thermal NO concentration increases sharply. The results show that the temperature distributions are significantly distorted by tripping any of the burners. The results show that tripping one or two burners either adjacent or opposite or tripping four results in regions of high temperature gases close to the walls. Heat absorptions in super-heater and economizer are greatly influenced by combustion air temperature and excess air factor and are slightly influenced by burner tripping.

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Section: The Governing Equationsmentioning

confidence: 99%

Thermal and emission characteristics in a tangentially fired boiler model furnace

Habib¹,

Ben‐Mansour²,

Abualhamayel³

2009

Int. J. Energy Res.

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“…ModakÕs [21] method is a simple and accurate technique for computing the emissivities and absorptivities of isothermal, homogeneous mixtures of CO 2 and H 2 O based on curve fits to emissivities using a wide band model to provide the emissivities in the curve fitting process. The technique was later extended to include CO and CH 4 [23].…”

Section: Flame Emission Models-participating Speciesmentioning

confidence: 99%

“…• a grey gas approach using total emissivity curve fits derived by Modak [21], • a mixed grey gas model developed by Truelove [6], • a banded implementation of TrueloveÕs [6] mixed grey gas model, • the total transmittance, non-homogeneous (TTNH) model of Grosshandler [22],…”

Section: Flame Emission Models-participating Speciesmentioning

confidence: 99%

Evaluation of flame emission models combined with the discrete transfer method for combustion system simulation

Cumber

Fairweather

2005

International Journal of Heat and Mass Transfer

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“…The solution of the radiative transfer equation (RTE) was obtained using the discrete ordinates (DO) radiation model [Raithby and Chui (1990)]. The blackbody spectral emissive power is calculated using variables by Liu et al (1998) and Zheng et al (2000) based on expressions of Modak (1979) and Smith et al (1982).…”

Section: Mathematical Formulation the General Form Of The Governing Ementioning

confidence: 99%

Characteristics of Oxyfuel and Air–Fuel Combustion in an Industrial Water Tube Boiler

Ben‐Mansour

Habib

Nemitallah

et al. 2014

Heat Transfer Engineering

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The characteristics of oxyfuel combustion are compared to those of air-fuel combustion in the furnace of a typical industrial water tube boiler. Two oxyfuel cases are considered. These correspond to 21% O 2 and 29% O 2 by volume. Validations for both oxyfuel combustion and air-fuel combustion indicate that the temperature levels are reduced in oxyfuel combustion. The results show that, as the percentage of recirculated CO 2 is increased, the temperature levels are greatly reduced. It is concluded that the flame propagation speed in O 2 /CO 2 environment is lower than that in O 2 /N 2 . It is found that the fuel and oxygen consumption rates are slower in oxyfuel combustion relative to air-fuel combustion. Heat transfer from the burnt gases to the water jacket along the different surfaces of the furnace is calculated. It is shown that the energy absorbed is much higher in the case of air-fuel combustion along all surfaces except for the end part of the furnace close to the furnace rear wall.

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Radiation from products of combustion

Cited by 49 publications

References 12 publications

Thermal and emission characteristics in a tangentially fired boiler model furnace

Thermal and emission characteristics in a tangentially fired boiler model furnace

Evaluation of flame emission models combined with the discrete transfer method for combustion system simulation

Characteristics of Oxyfuel and Air–Fuel Combustion in an Industrial Water Tube Boiler

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