Communication Dans Un Congrès Année : 2013

A global model for the NO released in vegetation fires

Résumé

Vegetation fires are a major emission source of CO, CO2, NOx, volatile organic compounds and particulates to the atmosphere, which in turn can form secondary pollutants with implications at local, regional or global scale. To describe the impact of these fires on the environment, especially on the atmosphere, and to model their pollutant emissions, it is necessary to understand the processes involved in the combustion of vegetation. Likewise, the analysis of combustion kinetics in the gas-phase is decisive for modeling vegetation fires behavior given that the rate and amount of energy released from the fuel are derived from the fundamental chemistry of the fuel and its combustion. However, the use of detailed reaction mechanisms, which involves a large number of species and reactions, is impractical owing to large computational time requirements. In this work, a numerical approach has been used to study the mechanisms of NO formation in vegetation fires at the source level, given that NO plays an important role on the formation of ground-level ozone. The major reaction mechanisms involved in NO chemistry have been identified using reactions path analysis and sensitivity analysis with a detailed kinetic mechanism (GDF-kin® 3.0). Moreover, a two-step global kinetic mechanism has been proposed herein to account for the conversion of volatile fuel-bound nitrogen to NO in the gas phase, considering that the volatile fraction of fuel-bound nitrogen is released as NH3. Data from simulations using the PSR code from CHEMKIN-II package with a detailed kinetic mechanism (GDF-kin® 3.0) have been used to formulate reaction rate expressions of the global model under typical wildfire conditions in terms of the inlet mixture composition, equivalence ratio and range of temperatures.

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Dates et versions

hal-03441355 , version 1 (22-11-2021)

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  • HAL Id : hal-03441355 , version 1

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Yolanda Perez-Ramirez, Paul-Antoine Santoni, Nasser Darabiha. A global model for the NO released in vegetation fires. CFM 2013 - 21ème Congrès Français de Mécanique, Aug 2013, Bordeaux, France. ⟨hal-03441355⟩
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