The CFD model was then verified and validated on a simplified geometry that contained six row-tubes which mimicked the tube arrangements of an HPSH section. In the second step, a three-dimensional CFD model was developed to account for the thermal and flow physics involved in HRSGs. The oxidation growth predicted by the model was then verified for a full-load boiler operation case. In the first step, an oxidation model based on a parabolic oxidation relationship was implemented. The HPSH section of the steam generator was selected for modeling because of its high oxidation rates.The model development included several steps. To address these challenges, a computational fluid dynamics (CFD) model of a high-pressure superheater (HPSH) was developed within the Siemens’ STAR-CCM+ CFD commercial software.
Predicting the oxide growth distribution requires detailed knowledge of the distribution of tube metal temperatures. Steam-side oxidation at elevated temperatures in heat recovery steam generators (HRSGs) can lead to overheating of local tubes, potential oxide scale exfoliation, and damage to critical equipment.
0 kommentar(er)
