1900

Simulation of the efficiency of hydrogen recombiners as safety devices

Abstract

Passive auto-catalytic recombiners (PARs) are used as safety devices in the containments of nuclear power plants (NPPs) for the removal of hydrogen that may be generated during specific reactor accident scenarios. In the presented study, it was investigated whether a PAR designed for hydrogen removal inside a NPP containment would perform principally inside a typical surrounding of hydrogen or fuel cell applications. For this purpose, a hydrogen release scenario inside a garage – based on experiments performed by CEA in the GARAGE facility (France) – has been simulated with and without PAR installation. For modelling the operational behaviour of the PAR, the in-house code REKO-DIREKT was implemented in the CFD code ANSYS-CFX. The study was performed in three steps: First, a helium release scenario was simulated and validated against experimental data. Second, helium was replaced by hydrogen in the simulation. This step served as a reference case for the unmitigated scenario. Finally, the numerical garage setup was enhanced with a commercial PAR model. The study shows that the PAR works efficiently by removing hydrogen and promoting mixing inside the garage. The hot exhaust plume promotes the formation of a thermal stratification that pushes the initial hydrogen rich gas downwards and in direction of the PAR inlet. The paper describes the code implementation and simulation results.

Related subjects: Safety
Countries: Germany
Loading

Article metrics loading...

/content/conference499
2011-09-12
2021-10-18
http://instance.metastore.ingenta.com/content/conference499
Loading

Supplements

Simulation of the efficiency of hydrogen recombiners as safety devices

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error