Thermohydraulic simulations can provide detailed heat recovery steam generator (HRSG) data to help determine the root cause of failures, predict the degree of wear from various mechanisms, and assess the overall thermal efficiency of the boilers. In this article, the results obtained from three case studies are presented to show the real-world benefits obtained through thermodynamic simulations.
Power plant staff needs reliable information on process conditions in heat recovery steam generators (HRSGs) to ensure safe operation and optimum performance. Current and historical operating data from the distributed control system (DCS) is a useful starting point, yet it does not provide detailed information on temperatures, pressures, or flows in all areas of the HRSG. This is achieved by running thermohydraulic simulations of the process. More detailed data can help in determining the root cause of failures or in predicting the degree of wear from a variety of mechanisms, including flow accelerated corrosion (FAC), fatigue, corrosion fatigue, and creep. Another advantage of simulation is that it can serve as a “test bed” to assess the impact of design or operating regime modifications on efficiency or unit life....
Typical triple pressure HRSG Gas scheme