Hydrogen Fluoride Formation During Slow Reaction and Auto-Ignition Processes of Stoichiometric R32-Air Mixtures
DOI:
https://doi.org/10.18321/ectj1688Keywords:
Refrigerant, R32-oxygen mixture, Explosion limit, Auto-ignition, Process safetyAbstract
The formation of hydrogen fluoride (HF) during the auto-ignition process of stoichiometric difluoromethane (R32)-air mixtures is numerically investigated in a cylindrical vessel under the influence of heat losses and heterogeneous wall reactions. Both slow reaction and successful explosion regimes are analyzed to study the thermo-kinetic conditions leading to HF formation. A detailed chemical mechanism is used for the gas-phase chemistry, while heterogeneous destruction reactions of reactive species at the wall surface are additionally considered. The effects of initial temperature, pressure and surface destruction efficiencies on HF production are investigated. Particular attention is paid to the role of OH radicals and heterogeneous wall reactions in controlling the formation of HF under non-explosive conditions.
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