摘要：In this paper, numerical investigation has been performed to predict ash particles impaction and distributiontendencies in a heat recovery steam generator (HRSG) of an industrial refining and chemical wastewaterincineration plant. A two-dimensional mathematical model with a six-row staggered arrangement has beenbuilt in order to study gas-particle two-phase flow in the HRSG, and the effects of ash particle size, flue gasvelocity, longitudinal tube pitch and spanwise tube pitch on ash particle impaction efficiency were investigated.Overall, all parameters played important roles in ash particle impaction performance except longitudinal tubepitch. The results showed that large particles mainly impacted on the windward side of the first two rows oftubes, while small particles impacted on both windward and leeward sides forming a uniform distribution.Enhancing the particle size and flue gas velocity contributed more ash particles to impact on the heat transfersurfaces, moreover, 20 µm particles were much more sensitive to fluid velocity compared with 0.2 µmparticles. As for spanwise tube pitch, the results indicated that it had an obvious effect on decreasing theimpaction efficiency with an increase of spanwise tube pitch, while with the increase of longitudinal tubepitch, the impaction efficiency declined slightly.
