Grade 91 Piping Risk Assessment
Thermal Simulations using PPS&D
Power Plant Simulator & Designer (PPS&D) provides state-of-the-art capabilities for modeling and simulating the operation of nearly any type of thermal power plant. Originally developed by KED GmbH in Germany for use by boiler OEMs in their detailed design work, PPS&D has since been used by numerous clients worldwide for simulating the operation of many types of boilers and thermal power plants.
Natural & forced circulation boilers, both sub- and super-critical
Pulverized coal boilers
Combined cycle power plants, heat recovery steam generators including once-through and Benson designs
Municipal waste incinerators
Fire tube boilers
Fluidized-bed combustion boilers
Model Steady-State and Dynamic Boiler Operation
PPS&D is available in a basic version for performing steady-state simulations of plant operation. The enhanced version adds dynamic simulation, allowing testing and integration of key steam cycle control functions, and evaluation of system transient (startup, shutdown, process upset) response.
Waterside scheme of triple pressure HRSG
More information about thermal simulations can be found here.
HRSG Inspection Planning Guide Snapshots
Tensile overload tube failures have become more common with the introduction of the larger combustion turbines that are typical of new combined cycle power plants. These failures are predominantly in reheater and superheater tubes, where inadequate drain capability exists during startup/shutdown or where desuperheater spray valves are not functioning appropriately. Desuperheater spray valve hardware and control logic have both contributed to these failures.
Effective inspection techniques for this damage mechanism depend on the severity and can include:
- Dye Penetrant
- Magnetic Particle