Reaktionskinetische Untersuchungen zur Auslegung von katalytischen Wasserstoffrekombinatoren
Reaktionskinetische Untersuchungen zur Auslegung von katalytischen Wasserstoffrekombinatoren
In the present study the reaction kinetics of the catalytic recombination of hydrogen and oxygen is investigated experimentally and theoretically. Hydrogen reacts on catalytic surfaces already at ambient temperatures. This fast is used in so-called recombinerswhich remove hydrogen in closed building...
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Personal Name(s): | Reinecke, Ernst-Arndt (Corresponding author) |
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Contributing Institute: |
Publikationen vor 2000; PRE-2000; Retrocat |
Imprint: |
Jülich
Forschungszentrum Jülich, Zentralbibliothek, Verlag
1999
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Physical Description: |
II, 110 p. |
Document Type: |
Report Book |
Research Program: |
Addenda |
Series Title: |
Berichte des Forschungszentrums Jülich
3703 |
Link: |
OpenAccess OpenAccess |
Publikationsportal JuSER |
In the present study the reaction kinetics of the catalytic recombination of hydrogen and oxygen is investigated experimentally and theoretically. Hydrogen reacts on catalytic surfaces already at ambient temperatures. This fast is used in so-called recombinerswhich remove hydrogen in closed buildings to mitigate the danger of an ignition followed by a detonation. The experiments were carried out at ambient pressure at temperatures of up to 500 $^\circ$C. Air-mixtures of up to 6 vol.-% hydrogen and up to 50 vol.-% steam were used. Plates as used in present recombiners were investigated as substrates as well as wire meshs made of steel. The obtained reaction data on plates covered by the flog can be described by a diffusion formulation. Published data can be caldulated well using the found relations. Wire meshs exhibit higher efficiencies than plates. Furthermore, it is possible to design modular and applicable recombiners. Reaction kinetics on wire meshs can also be described by diffusion. One disadvantage of present systems is insufficient heat removal. In a hydrogen rich atmosphere the ignition temperature can be reached thus leading to an ignition of the hydrogen/air-mixture. Using the found relations innovative recombiner systems shall be designed excluding overheating under all possible conditions. This goal can be reached by improved heat removal and storage as well as bylimiting the catalytic activity. |