Studies on innovative hydrogen recombiners as safety devices in the containments of light water reactors

Reinecke, Ernst-Arndt; Tragsdorf, Inga Maren; Gierling, Kerstin

doi:10.1016/j.nucengdes.2003.10.009

Cited by 76 publications

(35 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…4) Steady-state plate temperature: from 680 K (2*Q conv ) through to 1436 K (NoConvection), with a 'Reference' value of 838 K. No experimental values have been found for the plates themselves but, for the PAR housing and outlet, they reached about 640 K in the test (Kanzleiter, 1997a). Additionally, complementary analyses have shown that plate temperature predicted by this model is in fair agreement with numerical (Heitsch, 2000), experimental or analytical data (Reinecke, 2004) reported by other authors. Accurate prediction of plate temperature is considered convenient in order to establish the possibility of starting ignition in the homogeneous phase, as has been evidenced in some experiments (Kanzleiter, 1997c), (Blanchat, 1998).…”

Section: Influence Of Heat Transfer Parameterssupporting

confidence: 85%

“…On the other hand, risk of reaction initiation in the gaseous phase (homogeneous reaction) must be considered as a shortcoming of this kind of devices under high hydrogen concentrations. For preventing this undesired effect, innovative PAR designs have been proposed for controlling high plate temperatures under hydrogen-rich environments (Bachellerie, 2002) and (Reinecke, 2004).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A detailed chemistry model for transient hydrogen and carbon monoxide catalytic recombination on parallel flat Pt surfaces implemented in an integral code

Jiménez¹,

Martín-Valdepeñas²,

Martín-Fuertes³

et al. 2007

Nuclear Engineering and Design

View full text Add to dashboard Cite

A detailed chemistry model has been adapted and developed for surface chemistry, heat and mass transfer between H 2 /CO/air/steam/CO 2 mixtures and vertical parallel Pt-coated surfaces. This model is based onto a simplified Deutschmann reaction scheme for methane surface combustion and the analysis by Elenbaas for buoyancy-induced heat transfer between parallel plates. Mass transfer is treated by the heat and mass transfer analogy. The proposed model is able to simulate the H 2 /CO recombination phenomena characteristic of parallel-plate Passive Autocatalytic Recombiners (PARs), which have been proposed and implemented as a promising hydrogen-control strategy in the safety of nuclear power stations or other industries. The transient model is able to approach the warm-up phase of the PAR and its shut-down as well as the dynamic changes within the surrounding atmosphere. The model has been implemented within the MELCOR code and assessed against results of the Battelle Model Containment tests of the Zx series. Results show accurate predictions and a better performance than traditional methods in integral codes, i.e., empirical correlations, which are also much case-specific. Influence of CO present in the mixture on the PAR performance is also addressed in this paper.

show abstract

Section: Influence Of Heat Transfer Parameterssupporting

confidence: 85%

Section: Introductionmentioning

confidence: 99%

A detailed chemistry model for transient hydrogen and carbon monoxide catalytic recombination on parallel flat Pt surfaces implemented in an integral code

Jiménez¹,

Martín-Valdepeñas²,

Martín-Fuertes³

et al. 2007

Nuclear Engineering and Design

View full text Add to dashboard Cite

show abstract

“…The gas samples were acquired from different measuring points, cooled down, and delivered to the analyzer chamber. The analysis of the mixture composition was performed by two independent systems operation in parallel [7].…”

Section: Characteristics Of the Analyzed Objectmentioning

confidence: 99%

“…Considered object is some kind of benchmark exercise called PAR interaction studies -PARIS [14] and it was previously investigated by authors of [15] and also REKO 3 research team [7]. The subcompartment height was 3 m and width 4 m. PARs physics and chemistry were modeled as described earlier, but the geometry was prepared for AREVA's FR 1-150 PAR type: casing …”

Section: Sample Applicationmentioning

confidence: 99%

CFD modeling of passive autocatalytic recombiners*

2015

View full text Add to dashboard Cite

Abstract. This study deals with numerical modeling of passive autocatalytic hydrogen recombiners (PARs). Such devices are installed within containments of many nuclear reactors in order to remove hydrogen and convert it to steam. The main purpose of this work is to develop a numerical model of passive autocatalytic recombiner (PAR) using the commercial computational fl uid dynamics (CFD) software ANSYS-FLUENT and tuning the model using experimental results. The REKO 3 experiment was used for this purpose. Experiment was made in the Institute for Safety Research and Reactor Technology in Julich (Germany). It has been performed for different hydrogen concentrations, different fl ow rates, the presence of steam, and different initial temperatures of the inlet mixture. The model of this experimental recombiner was elaborated within the framework of this work. The infl uence of mesh, gas thermal conductivity coeffi cient, mass diffusivity coeffi cients, and turbulence model was investigated. The best results with a good agreement with REKO 3 data were received for k- model of turbulence, gas thermal conductivity dependent on the temperature and mass diffusivity coeffi cients taken from CHEMKIN program. The validated model of the PAR was next implemented into simple two-dimensional simulations of hydrogen behavior within a subcompartment of a containment building.

show abstract

“…The Pd-Pt catalysts (molar ratio Pd/ Pt = 1) of total metal loading 1 wt % were prepared by reverse "water-in-oil" microemulsion method according to our previous procedure [21]. The polyoxyethylene (7)(8) octylphenyl ether (Triton-X 114) (Aldrich) was used as the surfactant and cyclohexane (Aldrich) as the oil phase. The value of parameter W (water to surfactant molar ratio) equal to 5 was applied.…”

Section: Preparation Of Catalystsmentioning

confidence: 99%

Hydrogen and oxygen reaction on SiO2 and MoO3 supported Pd-Pt catalysts

Lalik¹,

Kołodziej²,

Kosydar³

et al. 2015

Recyclable Catalysis

View full text Add to dashboard Cite

Abstract:The thermal effects and activity of SiO 2 and MoO 3 supported bimetallic Pd-Pt catalysts (Pd:Pt = 1) in the exothermic H 2 and O 2 recombination reaction have been investigated in view of their potential use in the passive autocatalytic recombiners (PAR), which are applied at an industrial stage of development in the nuclear plant to lower the explosion risk associated with hydrogen release. The catalysts have been prepared using the colloid-based reverse "water-in-oil" microemulsion method and characterized by BET, XRD, SEM, EDS techniques. The recombination reaction of hydrogen and oxygen has been monitored using Microscal gasflow through microcalorimeter. This technique was also applied to follow hydrogen sorption by the Pd-Pt/ MoO 3 catalyst resulting in the formation of molybdenum bronzes (H X MoO 3 ). The pattern of changes in both the heat evolution and the conversion of hydrogen clearly show much better performance of Pd-Pt/SiO 2 catalyst. On Pd-Pt/ MoO 3 catalyst the conversion of H 2 was lower whereas the amount of evolved heat was higher because of exothermic reaction of bronzes formation. In contrast to Pd-Pt/SiO 2 catalyst offering stable activity, the activity of Pd-Pt/MoO 3 decreased during the catalytic test.

show abstract

Studies on innovative hydrogen recombiners as safety devices in the containments of light water reactors

Cited by 76 publications

References 5 publications

A detailed chemistry model for transient hydrogen and carbon monoxide catalytic recombination on parallel flat Pt surfaces implemented in an integral code

A detailed chemistry model for transient hydrogen and carbon monoxide catalytic recombination on parallel flat Pt surfaces implemented in an integral code

CFD modeling of passive autocatalytic recombiners*

Hydrogen and oxygen reaction on SiO2 and MoO3 supported Pd-Pt catalysts

Contact Info

Product

Resources

About