Effects of dimethyl methylphosphonate on premixed methane flames

Nogueira, Manoel; Fisher, Elizabeth M.

doi:10.1016/s0010-2180(02)00464-9

Cited by 21 publications

(12 citation statements)

References 22 publications

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“…In particular, we measured the concentration profiles of active H, O, OH, and PCSs species in a low-pressure H 2 / O 2 /Ar flame. Nogueira et al [16] studied the structure of rich and stoichiometric methane-oxygen flames doped with dimethyl methylphosphonate (DMMP) at a near-atmospheric pressure by microprobe sampling with subsequent FTIR spectroscopic analysis of the products. Authors measured the concentrations of intermediate stable species-CH 2 O, CH 3 OH, and all C 2 hydrocarbons in the flame.…”

Section: Introductionmentioning

confidence: 99%

Inhibition of atmospheric lean and rich CH4/O2/Ar flames by phosphorus-containing compound

Коробейничев

Шварцберг

Шмаков

et al. 2007

Proceedings of the Combustion Institute

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Section: Introductionmentioning

confidence: 99%

Inhibition of atmospheric lean and rich CH4/O2/Ar flames by phosphorus-containing compound

Коробейничев

Шварцберг

Шмаков

et al. 2007

Proceedings of the Combustion Institute

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“…Past kinetic studies of flame inhibition by OPCs have been limited by lack of reliable experimental data for PO x H y species concentrations. For example, Noguiera and Fisher [18] compared measured hydrocarbon species profiles from a DMMP-doped CH 4 /air, burner-stabilized, premixed flame to numerical model predictions.…”

Section: Introductionmentioning

confidence: 99%

Flame inhibition by phosphorus-containing compounds in lean and rich propane flames

Коробейничев

Шварцберг

Шмаков

et al. 2005

Proceedings of the Combustion Institute

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Chemical inhibition of laminar propane flames by organophosphorus compounds has been studied experimentally, using a laboratory Mache Hebra nozzle burner and a flat flame burner with molecular beam mass spectrometry (MBMS), and with a computational flame model using a detailed chemical kinetic reaction mechanism. Both fuel-lean and fuel-rich propane flames were studied to examine the role of equivalence ratio in flame inhibition. The experiments examined a wide variety of organophosphorus compounds. We report on the experimental species flame profiles for tri-methyl phosphate (TMP) and compare them with the species flame profile results from modeling of TMP and di-methyl methyl phosphonate (DMMP). Both the experiments and kinetic modeling support and illustrate previous experimental studies in both premixed and non-premixed flames that inhibition efficiency is effectively the same for all of the organophosphorus compounds examined, independent of the molecular structure of the initial inhibitor molecule. The chemical inhibition is due to reactions involving the small P-bearing species HOPO 2 and HOPO that are produced by the organophosphorus compounds (OPCs). The ratios of the HOPO 2 and HOPO concentrations differ between the lean and rich flames, with HOPO 2 dominant in lean flames while HOPO dominates in rich flames. The resulting HOPO 2 and HOPO species profiles do not depend significantly on the initial source of the HOPO 2 and HOPO and thus are relatively insensitive to the initial OPC inhibitor. A more generalized form of the original Twarowski mechanism for hydrocarbon radical recombination is developed to account for the results observed, and new theoretical values have been determined for heats of formation of the important P-containing species, using the BAC-G2 method.

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“…Molecular-beam mass sampling in premixed flames [6,7] outlined the basic catalytic radical recombination mechanism of phosphorus species in the gas-phase, and the later work investigated the reaction mechanism in more detail [8,9], leading eventually to detailed kinetic mechanisms for phosphorus compounds in flames [10][11][12][13][14][15][16]. Concurrent experimental work with premixed [13,[17][18][19][20][21], counterflow diffusion [22][23][24][25], and co-flow diffusion flames [19] helped to further refine the mechanisms and provide insight into the flame inhibition by phosphorus compounds.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigation of the gas‐phase effectiveness of phosphorus compounds

et al. 2015

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Summary The effectiveness of phosphorus‐containing compounds as gas‐phase combustion inhibitors varies widely with flame type. To understand this behavior, experiments are performed with dimethyl methylphosphonate (DMMP) added to the oxidizer stream of methane–air co‐flow diffusion flames (cup‐burner configuration). At low volume fraction, phosphorus (via DMMP addition) is shown to be about four times as effective as bromine (via Br2 addition) at reducing the amount of CO2 required for extinguishment; however, above about 3000 μL/L to 6000 μL/L, the marginal effectiveness of DMMP is approximately zero. In contrast, the diminished effectiveness does not occur for Br2 addition. To explore the role of condensation of active phosphorus‐containing compounds to the particles, laser‐scattering measurements are performed. Finally, to examine the behavior of the flame stabilization region (which is responsible for extinguishment), premixed burning velocity simulations with detailed kinetics are performed for DMMP addition to methane–air flames. Analyses of the numerical results are performed to understand the variation in the inhibition mechanism with temperature, agent loading, and stoichiometry, to interpret the loss of effectiveness for DMMP in the present experiments. Copyright © 2015 John Wiley & Sons, Ltd.

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Effects of dimethyl methylphosphonate on premixed methane flames

Cited by 21 publications

References 22 publications

Inhibition of atmospheric lean and rich CH4/O2/Ar flames by phosphorus-containing compound

Inhibition of atmospheric lean and rich CH4/O2/Ar flames by phosphorus-containing compound

Flame inhibition by phosphorus-containing compounds in lean and rich propane flames

Experimental and numerical investigation of the gas‐phase effectiveness of phosphorus compounds

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