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Erschienen in:
2022 | OriginalPaper | Buchkapitel
17. Numerical Investigation of Fly Ash Deposition onto Tube Bundles Inside Coal-Fired Boilers
verfasst von : Yipeng Li, Qian Huang, Lu Duan, Shuiqing Li
Erschienen in: Clean Coal and Sustainable Energy
Verlag: Springer Singapore
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Abstract
The particle-laden flow across tube arrays is numerically investigated as a model problem of ash deposition onto the convection heat transfer surfaces inside practical boilers. The transverse pitch ratio is found to significantly affect the impaction efficiency onto each tube. For the frontmost tube, a decrease in the transverse pitch ratio enhances the impaction efficiency of fly ash particle of all sizes. Then, the downstream tubes are more frequently exposed to fine particles. Nevertheless, a small transverse pitch ratio makes it possible for coarse mode particles to reach the second- and third-row tubes in the adjacent column after rebound from the front tube. Finally, a comparison between experiments and simulation implies that the existing sticking/rebound model may overestimate the ash fouling rate.