Simulation of hydrogen mitigation in catalytic recombiner. Part-II: Formulation of a CFD model

Prabhudharwadkar, Deoras; Iyer, Kannan N.

doi:10.1016/j.nucengdes.2011.01.013

Cited by 16 publications

(3 citation statements)

References 5 publications

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“…At massive hydrogen release (concentration of hydrogen above 7-10%) as in case of severe accident, the recombiner can overheat due to the large exothermic effect of the recombination reaction and thus PAR reactors may become an ignition source itself. This problem has been studied mainly by the numerical simulation of hydrodynamic conditions and hydrogen mitigation in catalytic recombiner [1][2][3][4][5][6]. Several analytical models have been developed to study the recombiner behavior with regard to detailed fluid kinetics, hydrogen and temperature distribution along with the recombination process.…”

Section: Introductionmentioning

confidence: 99%

Humidity induced deactivation of Al2O3 and SiO2 supported Pd, Pt, Pd-Pt catalysts in H2+O2 recombination reaction: The catalytic, microcalorimetric and DFT studies

Lalik

Kosydar

Tokarz-Sobieraj

et al. 2015

Applied Catalysis A: General

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Section: Introductionmentioning

confidence: 99%

Humidity induced deactivation of Al2O3 and SiO2 supported Pd, Pt, Pd-Pt catalysts in H2+O2 recombination reaction: The catalytic, microcalorimetric and DFT studies

Lalik

Kosydar

Tokarz-Sobieraj

et al. 2015

Applied Catalysis A: General

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“…[3] and [5][6][7][8][9]. Gas fl ow inside PAR was modelled either as laminar [5,6,8] or as turbulent one using the k- model [7] and the k- model [3,9].…”

Section: Modelling Of a Passive Autocatalytic Hydrogen Recombiner -A mentioning

confidence: 99%

Modelling of a passive autocatalytic hydrogen recombiner – a parametric study

Rożeń

2015

Nukleonika

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Abstract. Operation of a passive autocatalytic hydrogen recombiner (PAR) has been investigated by means of computational fl uid 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-, k-, intermittency, RSM) were applied in numerical simulations of: gas fl ow, 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 fl ow rates. At low gas fl ow rates, simulation results converged to those obtained for the limiting case of laminar fl ow. 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.

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“…The detailed numerical analysis of the operation and performance assessment of catalytic recombiners can be found in e.g. (Prabhudharwadkar et al, 2011a), (Prabhudharwadkar et al, 2011b) and (Heitsch, 2000). The simulation of the recombiners utilization in the atmosphere generated in the containment was performed by Royl et al (2006).…”

Section: H 2 Safety and Combustion For Nuclear Power Plantsmentioning

confidence: 99%

A model for turbulent combustion simulation of large scale hydrogen explosions

Escanciano¹

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The exhaustion, absolute absence or simply the uncertainty on the amount of the reserves of fossil fuels sources added to the variability of their prices and the increasing instability and difficulties on the supply chain are strong incentives for the development of alternative energy sources and carriers.The attractiveness of hydrogen in a context that additionally comprehends concerns on pollution and emissions is very high. Due to its excellent environmental impact, the public acceptance of the new energetic vector will depend on the risk associated to its handling and storage. From these, the danger of a severe explosion appears as the major drawback of this alternative fuel. This thesis investigates the numerical modeling of large scale explosions, focusing on the simulation of turbulent combustion in large domains where the resolution achievable is forcefully limited.

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Simulation of hydrogen mitigation in catalytic recombiner. Part-II: Formulation of a CFD model

Cited by 16 publications

References 5 publications

Humidity induced deactivation of Al2O3 and SiO2 supported Pd, Pt, Pd-Pt catalysts in H2+O2 recombination reaction: The catalytic, microcalorimetric and DFT studies

Humidity induced deactivation of Al2O3 and SiO2 supported Pd, Pt, Pd-Pt catalysts in H2+O2 recombination reaction: The catalytic, microcalorimetric and DFT studies

Modelling of a passive autocatalytic hydrogen recombiner – a parametric study

A model for turbulent combustion simulation of large scale hydrogen explosions

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