Abstract
The potential of two passive techniques, namely elliptic-shaped tubes and asymmetric tube bundle arrangement, for deposition rate reduction in lignite-fired utility boiler heat exchangers is numerically studied through comparison with an in-line tube arrangement with circular tubes. The simulation is based on a two-dimensional calculation of the turbulent two-phase flow in heat exchanger tube bundles using a subgrid-scale model for the small-scale turbulent structures and a particle adhesion model for the particle–surface interaction. Large-scale motion is found to be an important mechanism for tube surface fouling. Of the three tube bundle arrangements that were studied, the in-line tube bundle with elliptic-shaped tubes shows the lowest fouling rates and pressure drop. Taking advantage of these, heat transfer rates might be increased by placing more rows in the same area.
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