3D CFD model development and validation for once-through steam generator (OTSG): coupling combustion, heat transfer

The current research studies the coupled combustion inside the furnace and the steam generation inside the radiant and convection tubes through a typical Once-Through Steam Generator (OTSG). A 3D CFD model coupling combustion and two-phase flow was developed to model the entire system of OTSG. Once the combustion simulation was converged, the results were compared to field data showing a convincing agreement. The CFD analysis provides the detailed flow behaviour inside the combustion chamber and stack, the flow of steam inside the tubes in the radiant section and the two-phase flow steam generation process in the radiant and convective section. Flame shape and orientation, velocity, species and temperature distribution at various parts of the furnace as well as steam generation and steam distribution inside the pipes were correctly predicted.