Flow Field And Thermal Characteristics In A Model Of A Tangentially Fired Furnace Under Different Conditions Of Burner Tripping

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22 Φεβ 2014 (πριν από 3 χρόνια και 8 μήνες)

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Flow Field And Thermal Characteristics In A Model Of A

Tangentially

Fired Furnace Under Different Conditions Of Burner Tripping

Habib, MA; Ben
-
Mansour, R; Antar, MA

SPRINGER, HEAT AND MASS TRANSFER; pp: 909
-
920; Vol: 41

King Fahd University of Petroleum & Minerals

http://www.kfupm.edu.sa

Summary

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.

References:

Copyright: King Fahd University of Petroleum & Minerals;

http://www.kfupm.edu.sa

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For pre
-
prints please write to:
mahabib@kfupm.edu.sa

Copyright: King Fahd University of Petroleum & Minerals;

http://www.kfupm.edu.sa