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이병화,황민영,선칠영,전충환 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.7
Resolving ash-related problems such as fouling and slagging is crucial to the operation of a heat recovery steam generator (HRSG) in apower plant using heavy fuel oil (HFO). This paper presents numerical predictions of ash particle deposition using a model implementedwith CFD code. The deposition model considers the force of gravity, elastic rebound, and adhesion forces acting at the moment of ashparticle impact, which determine if the particle bounces off or stays on the surface and accumulates into a deposit. The 2D simulationresults showed that ash deposition depends significantly on the particle size and velocity. The normal gravity force is a significant parameterthat determines the position of deposition. The simulation results for ash deposition in an HFO-HRSG showed that ash depositsare highest (~34%) in the first and second rows, where the particles hit first, after which deposition decreases. However, ash deposits inthe internal array increase again in the rear rows because rebounding particles decelerate and are deposited because of gravity, as confirmedby observations of actual deposit formation.