Numerical treatment of heat recovery steam generator harps constructed from multiple tube bundle configurations

The heat recovery steam generator (HRSG) can be regarded as a heat exchanger, which uses the heat rejected from the gas cycle to supply steam for the vapor cycle. HRSGs are consisted of many tube bundles (or harps). Supplying a duct burner in the upstream of an HRSG necessitates constructing the fir...

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Bibliographic Details
Published in:Numerical heat transfer. Part A, Applications Applications, 2024-06, Vol.85 (11), p.1825-1844
Main Authors: Darbandi, Masoud, Mohammad, Ali
Format: Article
Language:English
Subjects:
Boiler
Boilers
CFD
Computational fluid dynamics
Configurations
Dissimilar materials
fin pitch
fin tube
Heat exchangers
Heat recovery
Heat recovery systems
Heat treatment
HRSG
Mathematical models
numerical simulation
periodic boundary condition
Pressure drop
tube bundle
Tubes
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Summary:The heat recovery steam generator (HRSG) can be regarded as a heat exchanger, which uses the heat rejected from the gas cycle to supply steam for the vapor cycle. HRSGs are consisted of many tube bundles (or harps). Supplying a duct burner in the upstream of an HRSG necessitates constructing the first bundle using different finned-tube materials with dissimilar fin configurations including unequal fin-pitch sizes. The computational fluid dynamics (CFD) has been widely used to study the flow through tube bundles; however, considering a fixed fin-pitch size for all rows of the finned-tubes. There is no trace of numerical analyses to treat tube bundles with unequal fin pitch sizes, apparently, because there are major challenges for the classical strategies, say unified-domain approach, to simulate tube bundles constructed from tubes with different fin configurations. This work introduces the splitted-domain approach as an innovative strategy to pass over the challenges with using the unified-domain approach. Then, these two approaches are used to model the superheater module of a real HRSG with available online measured data. The calculated Nusselt numbers and pressure drops indicate that the splitted-domain approach provides more accurate results than the unified one in simulating tube bundles constructed from tubes with dissimilar fin configurations.
ISSN:1040-7782
1521-0634
DOI:10.1080/10407782.2023.2212126