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Gas-Phase Interactions of Phosphorus Containing Compounds with Cup-Burner Diffusion Flames

Published

Author(s)

Gregory T. Linteris, Fumiaki Takahashi, Viswanath R. Katta, Valeri I. Babushok

Abstract

The effects of phosphorus-containing compounds (PCC) on the extinguishment and structure of methane-air coflow diffusion flames, in the cup-burner configuration, have been studied computationally. Dimethyl methylphosphonate (DMMP), trimethyl phosphate (TMP), or phosphoric acid was added to either the air or fuel flow. Time-dependent axisymmetric computation was performed with full gas-phase chemistry and transport to reveal the flame structure and inhibition process. A detailed chemical-kinetics model (77 species and 886 reactions) was constructed by combining the methane-oxygen combustion and phosphorus inhibition chemistry. A simple model for radiation from CH4, CO, CO2, and H2O based on the optically thin-media assumption was incorporated into the energy equation. The two-zone flame structure was formed for DMMP and, to a lesser extent, TMP, due to the heat release by the inhibitor itself. The inhibitor effectiveness was calculated as the minimum extinguishing concentrations (MECs) of CO2 (added to the oxidizer) as a function of the PCC loading (added to the oxidizer or fuel stream). The calculated MEC of CO2 without an inhibitor was in good agreement with the measured value. For moderate DMMP loading to the air (<1 %), the measured value became significantly smaller, presumably due to particle formation in the experiment. An inhibitor in the oxidizer flow was an-order-of-magnitude more effective compared to that in the fuel flow in gas-phase inhibition of co-flow diffusion flames.
Proceedings Title
Proc. of the Spring 2016 Eastern States Section Meeting of the Combustion Institute
Conference Dates
March 13-16, 2016
Conference Location
Princeton, NJ, US
Conference Title
Spring 2016 Eastern States Section Meeting of the Combustion Institute

Keywords

cup-burner flame extinguishment, fire suppression, phosphorus flame retardants, phosphorus flame inhibition, halon replacements, diffusion flame modeling.

Citation

Linteris, G. , Takahashi, F. , Katta, V. and Babushok, V. (2016), Gas-Phase Interactions of Phosphorus Containing Compounds with Cup-Burner Diffusion Flames, Proc. of the Spring 2016 Eastern States Section Meeting of the Combustion Institute, Princeton, NJ, US, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=920673 (Accessed April 19, 2024)
Created September 20, 2016, Updated April 4, 2022