A quasisteady multimode heat-transfer model for boiler concentric-tube overfire air ports has been developed that predicts the effect of geometry, furnace heat source and heat sink temperatures, axial injector wall conduction, and coolant flow rate on the tube wall temperature distributions. The model imposes a radiation boundary condition at the outlet tip of the ports, which acts as a heat source. The model was validated using field data and showed that both the airflow distribution in the ports and tube diameter can be used to control the maximum tube wall temperature. This helps avoid tube overheating and thermal degradation. For nominal operating conditions, highly nonlinear axial temperature distributions were observed in both tubes near the hot outlet end of the port.
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March 2009
Research Papers
A Thermal Model for Concentric-Tube Overfire Air Ports
Larry W. Swanson,
Larry W. Swanson
GE Environmental Services
, 1831 E. Carnegie Avenue, Santa Ana, CA 92705
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David K. Moyeda
David K. Moyeda
GE Environmental Services
, 1831 E. Carnegie Avenue, Santa Ana, CA 92705
Search for other works by this author on:
Larry W. Swanson
GE Environmental Services
, 1831 E. Carnegie Avenue, Santa Ana, CA 92705
David K. Moyeda
GE Environmental Services
, 1831 E. Carnegie Avenue, Santa Ana, CA 92705J. Thermal Sci. Eng. Appl. Mar 2009, 1(1): 011004 (5 pages)
Published Online: July 21, 2009
Article history
Received:
December 18, 2008
Revised:
March 9, 2009
Published:
July 21, 2009
Citation
Swanson, L. W., and Moyeda, D. K. (July 21, 2009). "A Thermal Model for Concentric-Tube Overfire Air Ports." ASME. J. Thermal Sci. Eng. Appl. March 2009; 1(1): 011004. https://doi.org/10.1115/1.3159524
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