Theoretical and Experimental Method for Calculating the Conditions of the Convective Mode of Combustion

Seplyarskii, B. S.; Кочетков, Р. А.; Лисина, Т. Г.

doi:10.1134/s1990793119020064

Cited by 7 publications

(2 citation statements)

References 3 publications

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“…How can PVB DPs, the decomposition of which occurs at temperatures below 200°С, occur behind the combustion front and ensure the ignition of titanium particles located on the surface of the granules? To address this question, it is necessary to take into account the two-dimensional structure of the combustion wave of a granular mixture in the convective mode [13][14][15]. Indeed, the time of ignition of a granule in a convective mode can be estimated by the formula (3) For the experimental combustion rates U of granules with the characteristic size of d = 1 mm, at an increase in the Ni content in the mixture from 0 to 20%, the ignition time varies from 0.008 to 0.023 s for mixtures A and from 0.006 to 0.017 s for mixtures B.…”

Section: Resultsmentioning

confidence: 99%

Effect of the Polyvinyl Butyral Content on the Combustion Mode of the (Ti + C) + xNi Granular Mixture

Seplyarskii

Абзалов

Кочетков

et al. 2021

Russ. J. Phys. Chem. B

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In this paper, we study the effect of the polyvinyl butyral content (0-2.3%) on the combustion rate and phase composition of the (Ti + C) + xNi granular mixture, where x = 0, 5, 10, 15, and 20 wt %. At an increased content of the binder, for the first time, a convective combustion mode is discovered due to the ignition of the surface of granules with hot gaseous decomposition products of polyvinyl butyral. This mode is characterized by a higher rate of propagation of the reaction front than follows from the filtration combustion theory. The mechanism for the occurrence of nondecomposed polyvinyl butyral behind the ignition front is explained. According to the X-ray phase analysis data, the phase composition of combustion products does not change with a change in the polyvinyl butyral and nickel content in the mixture and includes only two phases: TiC and Ni. It is shown that when scaling the process of obtaining composite powders from a granular charge (Ti + C) + xNi, it is necessary to ensure the implementation of the conductive combustion mode.

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Section: Resultsmentioning

confidence: 99%

Effect of the Polyvinyl Butyral Content on the Combustion Mode of the (Ti + C) + xNi Granular Mixture

Seplyarskii

Абзалов

Кочетков

et al. 2021

Russ. J. Phys. Chem. B

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“…Depending on the thermophysical characteristics of the flows of the solid and gas phases, various thermal combustion modes can be realized [6,7]. The most efficient heat exchange occurs when the heat capacities of the phases' flows are equal; therefore, the presence of a noticeable amount of mineral components in the fuel is not always a disadvantage [8,9].…”

Section: Introductionmentioning

confidence: 99%

Energy Efficiency of the Gasification of a Dense Layer of Solid Fuels in the Filter Combustion Mode

Кислов

Цветков

Zaichenko

et al. 2021

Russ. J. Phys. Chem. B

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The energy efficiency of the gasification of various solid fuels in the filtration combustion mode is evaluated. The modes of gasification of carbon and organic fuels with the moisture content of up to 70% and ash content of up to 90% are considered. The efficiency of air gasification of low-moisture carbon fuels does not exceed 70%; and of organic fuels, 85%. The efficiency of the air gasification of high-moisture fuels can reach 85-90%. The addition of steam to the gaseous oxidizer increases the efficiency of the process. The efficiency of steam-air the gasification of low-moisture low-ash carbon fuels reaches 85%. In the case of organic fuels, the maximum efficiency of steam-air gasification is observed for fuels with an ash content of 20 to 40%. For highly reactive fuels, the maximum efficiency is observed for ashless fuels. If the reactivity of the fuel is low, the highest gasification efficiency will be for high ash fuels.

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Effect of a Ti + C Granule Size on Combustion in a Nitrogen Flow

Seplyarskii

Кочетков

Лисина

et al. 2021

Combust Explos Shock Waves

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Theoretical and Experimental Method for Calculating the Conditions of the Convective Mode of Combustion

Cited by 7 publications

References 3 publications

Effect of the Polyvinyl Butyral Content on the Combustion Mode of the (Ti + C) + xNi Granular Mixture

Effect of the Polyvinyl Butyral Content on the Combustion Mode of the (Ti + C) + xNi Granular Mixture

Energy Efficiency of the Gasification of a Dense Layer of Solid Fuels in the Filter Combustion Mode

Effect of a Ti + C Granule Size on Combustion in a Nitrogen Flow

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