Modelling of a passive autocatalytic hydrogen recombiner – a parametric study

• Authors: Antoni Rożeń
• Languages of publication: EN

Abstracts

EN

Operation of a passive autocatalytic hydrogen recombiner (PAR) has been investigated by means of computational fluid dynamics methods (CFD). The recombiner is a self-active and self-adaptive device used to remove hydrogen from safety containments of light water nuclear reactors (LWR) by means of a highly exothermic reaction with oxygen at the surface of a platinum or palladium catalyst. Different turbulence models (k-ω, k-ɛ, intermittency, RSM) were applied in numerical simulations of: gas flow, heat and mass transport and chemical surface reactions occurring in PAR. Turbulence was found to improve mixing and mass transfer and increase hydrogen recombination rate for high gas flow rates. At low gas flow rates, simulation results converged to those obtained for the limiting case of laminar flow. The large eddy simulation technique (LES) was used to select the best RANS (Reynolds average stress) model. Comparison of simulation results obtained for two- and three-dimensional computational grids showed that heat and mass transfer occurring in PAR were virtually two-dimensional processes. The effect of hydrogen thermal diffusion was also discussed in the context of possible hydrogen ignition inside the recombiner.

Keywords

EN

CFD; hydrogen; large eddy simulation; catalytic recombiner; turbulence

• Publisher: De Gruyter Open
• Journal: Nukleonika
• Year: 2015
• Volume: 60
• Issue: 1
• Pages: 161-169

Dates

published

1 - 3 - 2015

online

12 - 3 - 2015

received

14 - 8 - 2014

accepted

27 - 11 - 2014

Contributors

author

Antoni Rożeń

• Faculty of Chemical and Process Engineering, Warsaw University of Technology, 1 Waryńskiego Str., 00-645 Warsaw, Poland, Tel.: [phone], Fax: [phone]

References

• 1. International Atomic Energy Agency. (2001). Mitigation of hydrogen hazards in water cooled power reactors. Vienna: IAEA. (IAEA-TECDOC-1196).
• 2. International Atomic Energy Agency. (2011). Mitigation of hydrogen hazards in severe accidents in nuclear power plants. Vienna: IAEA. (IAEA-TECDOC-1661).
• 3. Reinecke, E. A., Bentaib, A., Kelm, S., Jahn, W., Meynet, N., & Caroli, C. (2010). Open issues in the applicability of recombiner experiments and modelling to reactor simulations. Prog. Nucl. Energy, 52, 136–147.[WoS]
• 4. Fineschi, F., Bazzichi, M., & Carcassi, M. (1996). A study of the hydrogen recombination rates of catalytic recombiners and deliberate ignition. Nucl. Eng. Des., 166, 481–494.
• 5. Heitsch, M. (2000). Fluid dynamic analysis of a catalytic recombiner to remove hydrogen. Nucl. Eng. Des., 201, 1–10.
• 6. Gera, B., Sharma, P. K., & Singh, R. K. (2010). Numerical study of passive catalytic recombiner for hydrogen mitigation. CFD Letters, 2, 123–136.
• 7. Prabhudharwadkar, D. M., & Iyer, K. N. (2011). Simulations of hydrogen mitigation in catalytic recombiner: Formulation of a CFD model. Nucl. Eng. Des., 241, 1758–1767.
• 8. Meynet, N., Bentaib, A., & Giovangigli, V. (2014). Impact of oxygen starvation on operation and potential gas-phase ignition of passive auto-catalytic recombiners. Combust. Flame, 161, 2192–2202.[WoS]
• 9. Klauck, M., Reinecke, E.-A., Kelm, S., Meynet, N., & Bentaib, A., & Allelein, H.-J. (2014). Passive autocatalytic recombiners operations in the presence of hydrogen and carbon monoxide: Experimental study and model development. Nucl. Eng. Des., 266, 137–147.[WoS]
• 10. Poling, B. E., Prausnitz, J. M., & O'Connell, J. P. (2001). The properties of gases and liquids. Boston, USA: McGraw-Hill Co.
• 11. Drinovac, P. (2006). Experimental studies on catalytic hydrogen recombiners for light water reactors. PhD Thesis, RWTH Aachen University, Germany.
• 12. The European Stainless Steel Association, Tables of technical properties of stainless steels. Retrieved in August 2014, from .
• 13. Churchill, S. W., & Chu, H. H. S. (1975). Correlating equations for laminar and turbulent free convection from a vertical plate. Int. J. Heat Mass Transfer, 18, 1323–1329.[WoS]
• 14. Rohsenow, W. M., Hartnett, J. P., & Cho, Y. I. (1998). Handbook of heat transfer. New York, USA: McGraw-Hill Co.
• 15. Monarch Instrument. (2014). Table of total emissivity. Metals. Retrieved in August 2014, from .
• 16. Friedel, E., Rosen, A., & Kasemo, B. (1994). A laser induced fluorescence study on OH desorption from Pt in H2O/O2 and H2O/H2 mixtures. Langmuir, 10, 699–708.
• 17. Prabhudharwadkar, D. M., Aghalayam, P. A., & Iyer, K. N. (2011). Simulations of hydrogen mitigation in catalytic recombiner: Surface chemistry modelling. Nucl. Eng. Des., 241, 1746–1757.
• 18. Schefer, R. W. (1982). Catalyzed combustion of H2/air mixtures in a flat plate boundary layer: Numerical model. Combust. Flame, 45, 171–190.
• 19. SAS IP, Inc. (2012). Ansys Release 14.5 Theory Guide. Canonsburg, USA.
• 20. SAS IP, Inc. (2012). Ansys Release 14.5 User Guide. Canonsburg, USA.

Identifiers

DOI

10.1515/nuka-2015-0002