Flame Inhibition by Potassium-Containing Compounds

Babushok, Valeri I.; Linteris, Gregory T.; Hoorelbeke, Pol; Roosendans, Dirk; Wingerden, Kees van

doi:10.1080/00102202.2017.1347162

Cited by 52 publications

(19 citation statements)

References 39 publications

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“…The potassium chemistry results in the generation of KOH and K atoms as the dominant potassium species in the hot flue gas. 24 In the fuel-lean case, KOH is the dominant species, whereas, in the fuel-rich case, nearly half of the potassium exists as K atoms. When changing from a fuel-lean flame to a fuel-rich flame, the increase of the concentration of K atoms will be equal to the reduction of KOH.…”

Section: Resultsmentioning

confidence: 99%

Ultraviolet Absorption Cross Sections of KOH and KCl for Nonintrusive Species-Specific Quantitative Detection in Hot Flue Gases

et al. 2019

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An understanding of potassium chemistry in energy conversion processes supports the development of complex biomass utilization with high efficiency and low pollutant emissions. Potassium exists mainly as potassium hydroxide (KOH), potassium chloride (KCl), and atomic potassium (K) in combustion and related thermochemical processes. We report, for the first time, the measurement of the ultraviolet (UV) absorption cross sections of KOH and KCl at temperatures between 1300 K and 1800 K, using a newly developed method. Using the spectrally resolved UV absorption cross sections, the concentrations of KOH and KCl were measured simultaneously. In addition, we measured the concentrations of atomic K using tunable diode laser absorption spectroscopy, both at 404.4 and 769.9 nm. The 404.4 nm line was utilized to expand the measurement dynamic range to higher concentrations. A constant amount of KCl was seeded into premixed CH4/air flames with equivalence ratios varied from 0.67 to 1.32, and the concentrations of KOH, KCl, and atomic K in the hot flue gas were measured nonintrusively. The results indicate that these techniques can provide comprehensive data for quantitative understanding of the potassium chemistry in biomass combustion/gasification.

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Section: Resultsmentioning

confidence: 99%

Ultraviolet Absorption Cross Sections of KOH and KCl for Nonintrusive Species-Specific Quantitative Detection in Hot Flue Gases

et al. 2019

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“…Research on flame inhibition [6,10,[12][13][14][15] has mostly relied on the interaction of the gaseous agent with the flame chemistry (homogeneous inhibition) to explain the experimental results, without clearly stating the set of assumptions under which this approach is valid. An attempt to clarify this issue is provided in this section.…”

Section: Clarifying the Homogeneous Inhibition Limitmentioning

confidence: 99%

“…In the following, I g = IOH with I = {K, N a}. The Kinetic models in [13] and [12] are used to model the catalytic properties of potassium and sodium con- The inhibition effect of alkali hydroxydes are analyzed using one-dimensional premixed flames, computed with the Cantera [17] software. A flame with given equivalence ratio φ is enriched with various values of Y IOH,u at T u = 300 K and P = 1 atm, where the subscript u refers to the unburnt gas side.…”

Section: Detailed Chemical Inhibition Sub-modelsmentioning

confidence: 99%

“…By promoting radical scavenging, I g acts as a catalyser of the chain-termination stage. The main source of flame speed reduction in the case of alkali metals is attributed to this catalytic effect, at least for small concentrations of inhibitor [10,12,13].…”

Section: Introductionmentioning

confidence: 99%

“…They are based on the assumption that the inhibitor completely decomposes early inside the flame front into a gaseous agent.The latter can then be included in the fresh gases composition, thereby leading to a drastic simplification of the flame inhibition problem. This led to the formulation of multiple kinetic models for the interaction of alkali metal containing species with hydrocarbon flame chemistries [6,10,[12][13][14][15]. The inhibition efficiency of these gaseous agents strongly depends on the flame itself (fuel, equivalence ratio, etc...).…”

Section: Introductionmentioning

confidence: 99%

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Time scale analysis of the homogeneous flame inhibition by alkali metals

Dounia

Vermorel

Jaravel

et al. 2021

Proceedings of the Combustion Institute

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Suppression of methane explosion in a pipe network by carbon dioxide‐driven montmorillonite powder with different masses

Fengxiao

Jia

Xiuyuan

2022

Intl J of Energy Research

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Summary Methane explosion is a major threat to modern industrial safety. An explosion suppression experiment that uses montmorillonite powder with different masses driven by carbon dioxide was conducted in an independently built pipe network. The performance of different parameters was characterized by peak explosion overpressures, explosion power indexes, and times for the flame wave to reach the outlet of the pipe network. Additionally, the explosion suppression mechanism was analyzed. The results demonstrated that increasing the powder mass from 20 to 50 g gradually enhanced the explosion suppression performance, while the performance slightly increased when the powder mass increased to 60 g. Therefore, from the perspective of practical application, energy conservation, and environmental protection, selecting 50 g of montmorillonite powder can thoroughly suppress methane explosions, indicating the best performance. The conclusions of this study can provide theoretical support for improving safety in industrial transportation that uses methane and effectively mitigating disaster risk.

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Flame Inhibition by Potassium-Containing Compounds

Cited by 52 publications

References 39 publications

Ultraviolet Absorption Cross Sections of KOH and KCl for Nonintrusive Species-Specific Quantitative Detection in Hot Flue Gases

Ultraviolet Absorption Cross Sections of KOH and KCl for Nonintrusive Species-Specific Quantitative Detection in Hot Flue Gases

Time scale analysis of the homogeneous flame inhibition by alkali metals

Suppression of methane explosion in a pipe network by carbon dioxide‐driven montmorillonite powder with different masses

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