23 Result(s)
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Article
Inhibition of Combustion and Explosion of Methane–Air Mixtures in the Presence of Coal Dust
Coal dust was shown to promote the combustion of methane–air mixtures, reducing the lower concentration limit of flame propagation and making combustion progressive (coal of different grades was used). An inhi...
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Article
Synergism of the Combined Action of Inhibitor and Inert Gas
The synergy phenomenon is known as a nonadditive effect of various additives on the reaction. This effect was earlier used mainly in liquid-phase reactions and was explained by the reactions of active impuriti...
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Article
Dependences of Flame Propagation Characteristics on Heterogeneous Reactions of Intermediate Particles
The example of a model reaction of combustion of hydrogen with oxygen is used to show that the flame propagation rate, its thermal mode, and conditions for transition to an explosion strongly depend on the rat...
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Article
Physicochemical Mechanisms and Kinetic Laws Influencing the Extreme Rate of Reactions in the Combustion and Detonation of Gases
Results from studying on kinetic features of reactions in the combustion, explosion, and detonation of gases are generalized with the combined use of kinetic and spectroscopic means. It is established that des...
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Article
Role of Heterogeneous Chain Termination in Flame Propagation
The kinetic characteristics of propagating flame were shown to depend on the chemical properties of the contacting solid surface and on the rates of heterogeneous recombination of active intermediate particles...
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Article
Open AccessPhysical and Chemical Mechanisms of Reactions that Proceed at Extremely High Rates in a Propagating Flame and the Detonation of Gas
The characteristic periods of the reactions in a propagating flame and the detonation of most gases are found to be less than 10−4 and 10−6 s, respectively. The extreme rates and accelerations of reactions respon...
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Article
Using Small Impurities of Inert Gases to Prevent the Combustion of Methane from Transitioning to an Explosion
The combustion of methane–air mixtures is used as an example to show that small additives of inert gases can help prevent the critical conditions of combustion transitioning to the explosion mode. It is found ...
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Article
Temperature Dependence of the Rates of Oxidation and Decomposition of Combustible Gases
It is shown that the oxidation of gas outside the ignition region consists of isothermal chain processes with no progressive self-acceleration. The functional nature of the rate of the reaction’s temperature d...
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Article
Controlling the Combustion, Exploding, and Detonation of Gases by Means of Chemical Kinetics
Ways are considered of preventing fires and explosions of methane–air mixtures in coal mines and elsewhere, the ignition and explosion of hydrogen–air mixtures, and the transition of combustion to detonation i...
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Article
Possible Gravitational Stratification of Components in Mixtures of Reaction Gases
It is shown that in gas storage tanks and closed premises containing gas mixtures consisting of components of the type of hydrogen, lower hydrocarbons, and light freons, the gravitational stratification of the...
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Article
The Important Role of Heterogeneous Reactions of Free Atoms and Radicals in Processes of Flame Propagation
It is shown that patterns of flame propagation and the spectral composition of emission depend strongly on the chemical composition of the contacting surfaces in a wide range of pressures. This reveals the imp...
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Article
Kinetic Features of Gas Ignition upon Heating
Using hydrogen oxidation as a model reaction, it is shown that the ignition of combustible gases upon heating in the region of atmospheric pressure is caused by a chain avalanche reinforced by self-heating of ...
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Article
Determining Role of the Chain Mechanism in the Temperature Dependence of the Gas-Phase Rate of Combustion Reactions
It is shown that the strong dependence of the rate of gas-phase combustion reactions on temperature is determined by the high values of the reaction rate constants of free atoms and radicals. It is established...
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Article
Chain-Thermal Explosions and the Transition from Deflagration Combustion to Detonation
The transition from combustion to a chain-thermal explosion, a necessary step in the transition from deflagration combustion into detonation, is studied using the example of hydrogen oxidation. Differences bet...
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Article
Difference in the Mechanisms of the Inhibition of Hydrogen Combustion in the Deflagration and Detonation Modes
It is shown that, in the process of inhibition of hydrogen combustion by hydrocarbons, intermediate products that play a key role are not only traditionally considered olefins, but also oxygen-containing compo...
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Article
The role of molecular-kinetic and thermal factors in inhibition of steady detonation
It was experimentally shown that the reaction of the combustion of hydrogen–air mixtures in a detonation wave virtually completely (with an accuracy of 1%) occurs by a branched-chain mechanism; it is this mech...
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Article
Synergism in combustion processes
The effect of CF3H, CF4, and N2 on the ignition of methane–air mixtures has been investigated. The effect of trifluoromethane is due to its being involved in reaction chain termination. A nonadditive effect of tr...
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Article
Regularities in the consumption of the initial reactants in various kinetic regimes
Using hydrogen oxidation as an example, it is demonstrated that, when gas ignition is prevented by means of inhibition, there is practically no consumption of the initial reactants because reaction chains do n...
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Article
Role of changes in the molar mass and heat capacity of the combustible mixture in the inhibition of hydrogen-air detonation
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Article
Breakup of steady-state detonation in hydrogen-air mixtures under the action of propane admixtures
Minor amounts of propane effectively inhibit the detonation of hydrogen-air mixtures at atmospheric pressure. Controlled variation of the amount of the admixture provides means to break up the steady-state det...
