LES simulations of sour gas flares in Western Canada

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Title LES simulations of sour gas flares in Western Canada
Creator Thornock, Jeremy; Smith, Philip; Chambers, Allan K.
Publication type report
Program American Flame Research Committee (AFRC)
Date 2009
Description In this paper we describe the development of a numerical simulation tool for a sour gas flare of the type typically found in Alberta. The purpose of the model is to provide a way to guide safer sour gas flare operating conditions for varying environmental and operating conditions. The numerical simulation tool (ARCHES) uses a Large Eddy Simulation (LES) model coupled with chemistry and radiation models to provide a high-fidelity (time and space) description of the flow field. Time integrals of the combustion efficiency were obtained to provide mean combustion efficiencies. Due to the expense of running each LES flare calculation, the boundary conditions for the simulations were chosen using a Box-Behnkin experimental design philosophy. The response surface generated from the Box-Behnkin design then served as a surrogate model for the LES calculation and provided insight into the interaction of H2S content, wind speed, and fuel velocity as they related to efficiency of the formation of CO2 and the destruction of H2S. The simulation results show that the local Damkohler number (reaction rate/mixing rate) changes dramatically for flares that have the same momentum flux ratio (momentum flux of flare gas / momentum flux of the crosswind). The results also show that; 1) When strain rates are high in the flow field, local quenching is possibly causing a decrease in combustion efficiency; 2) Buoyancy dominated flares produce low puffing frequency type motions, have low strain rates, and also show low efficiency. The response surface has a maximum efficiency contained within the current design space, which suggests a region of better operating conditions to maximize combustion efficiency depending on the local wind speed. In addition to presenting the results, we will discuss methods for improving the reliability of the calculations by quantifying the uncertainty with the LES model.
Type Text
Format application/pdf
Language eng
OCR Text Show
Metadata Cataloger CLR; AM
ARK ark:/87278/s69d20jc
Relation has part Thornock, J., Smith, P., & Chambers, A. K. (2009). LES simulations of sour gas flares in Western Canada. American Flame Research Committee (AFRC).
Format medium application/pdf
Rights management (c)American Flame Research Committee (AFRC)
Setname uu_afrc
Date Created 2020-02-11
Date Modified 2021-05-06
ID 1525749
Reference URL https://collections.lib.utah.edu/ark:/87278/s69d20jc