Ignition of the wood biomass particles under conditions of near-surface fragmentation of the fuel layer

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1 Citation (Scopus)

Abstract

The results of the experimental and theoretical studies of the ignition processes of the woody biomass single particles of a cubic form under conditions of preliminary fragmentation of the particle surface have been presented. It is established experimentally that the increase in the result of the external mechanical influences, in the heat exchange area (due to the formation of grooves and cracks) leads to an acceleration of the ignition process. According to the results of the experiments, a new mathematical model of the ignition process of the wood biomass particle under conditions of near-surface fragmentation, which differs from previously known ones, has been formulated. It describes the thermophysical processes and thermochemical processes and intense phase (evaporation of water) transformations, in conditions of change in the surface relief of the particle, and, accordingly, the density of the heat flux along the particle contour and the concentration of combustible gases in the boundary layer of the particle. The formulated system of the nonlinear partial differential equations in partial derivatives with the corresponding boundary conditions describes the process of ignition in a two-dimensional setting, taking into account the substantial nonuniformity of the temperature field of a wood particle in the induction period. Up to the present time, the mathematical models of such a degree of detailing of the physical processes occurring together during the ignition of wood under the conditions of fragmentation of its surface have not been formulated. The comparative analysis of the ignition delay times (t ign ), obtained theoretically and experimentally, has showed their satisfactory correspondence. As a result of the numerical simulation, the temperature fields in the “fuel particle-high-temperature medium” system have been obtained, illustrating the features of the course of the thermochemical reactions of the wood particles ignition under conditions of fragmentation of their surface.

Original languageEnglish
Pages (from-to)19-36
Number of pages18
JournalFuel
Volume252
DOIs
Publication statusPublished - 15 Sep 2019

Fingerprint

Ignition
Wood
Biomass
Temperature distribution
Mathematical models
Partial differential equations
Heat flux
Time delay
Boundary layers
Evaporation
Gases
Boundary conditions
Derivatives
Cracks
Water
Computer simulation
Experiments
Temperature

Keywords

  • Evaporation of moisture
  • Heat and mass transfer
  • Ignition
  • Inflammation of volatiles
  • Surface fragmentation
  • Thermal preparation of fuel
  • Wood particle

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Organic Chemistry

Cite this

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title = "Ignition of the wood biomass particles under conditions of near-surface fragmentation of the fuel layer",
abstract = "The results of the experimental and theoretical studies of the ignition processes of the woody biomass single particles of a cubic form under conditions of preliminary fragmentation of the particle surface have been presented. It is established experimentally that the increase in the result of the external mechanical influences, in the heat exchange area (due to the formation of grooves and cracks) leads to an acceleration of the ignition process. According to the results of the experiments, a new mathematical model of the ignition process of the wood biomass particle under conditions of near-surface fragmentation, which differs from previously known ones, has been formulated. It describes the thermophysical processes and thermochemical processes and intense phase (evaporation of water) transformations, in conditions of change in the surface relief of the particle, and, accordingly, the density of the heat flux along the particle contour and the concentration of combustible gases in the boundary layer of the particle. The formulated system of the nonlinear partial differential equations in partial derivatives with the corresponding boundary conditions describes the process of ignition in a two-dimensional setting, taking into account the substantial nonuniformity of the temperature field of a wood particle in the induction period. Up to the present time, the mathematical models of such a degree of detailing of the physical processes occurring together during the ignition of wood under the conditions of fragmentation of its surface have not been formulated. The comparative analysis of the ignition delay times (t ign ), obtained theoretically and experimentally, has showed their satisfactory correspondence. As a result of the numerical simulation, the temperature fields in the “fuel particle-high-temperature medium” system have been obtained, illustrating the features of the course of the thermochemical reactions of the wood particles ignition under conditions of fragmentation of their surface.",
keywords = "Evaporation of moisture, Heat and mass transfer, Ignition, Inflammation of volatiles, Surface fragmentation, Thermal preparation of fuel, Wood particle",
author = "Kuznetsov, {G. V.} and Syrodoy, {S. V.} and Gutareva, {N. Y.} and Kostoreva, {A. A.} and Kostoreva, {Zh A.}",
year = "2019",
month = "9",
day = "15",
doi = "10.1016/j.fuel.2019.03.126",
language = "English",
volume = "252",
pages = "19--36",
journal = "Fuel",
issn = "0016-2361",
publisher = "Elsevier BV",

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TY - JOUR

T1 - Ignition of the wood biomass particles under conditions of near-surface fragmentation of the fuel layer

AU - Kuznetsov, G. V.

AU - Syrodoy, S. V.

AU - Gutareva, N. Y.

AU - Kostoreva, A. A.

AU - Kostoreva, Zh A.

PY - 2019/9/15

Y1 - 2019/9/15

N2 - The results of the experimental and theoretical studies of the ignition processes of the woody biomass single particles of a cubic form under conditions of preliminary fragmentation of the particle surface have been presented. It is established experimentally that the increase in the result of the external mechanical influences, in the heat exchange area (due to the formation of grooves and cracks) leads to an acceleration of the ignition process. According to the results of the experiments, a new mathematical model of the ignition process of the wood biomass particle under conditions of near-surface fragmentation, which differs from previously known ones, has been formulated. It describes the thermophysical processes and thermochemical processes and intense phase (evaporation of water) transformations, in conditions of change in the surface relief of the particle, and, accordingly, the density of the heat flux along the particle contour and the concentration of combustible gases in the boundary layer of the particle. The formulated system of the nonlinear partial differential equations in partial derivatives with the corresponding boundary conditions describes the process of ignition in a two-dimensional setting, taking into account the substantial nonuniformity of the temperature field of a wood particle in the induction period. Up to the present time, the mathematical models of such a degree of detailing of the physical processes occurring together during the ignition of wood under the conditions of fragmentation of its surface have not been formulated. The comparative analysis of the ignition delay times (t ign ), obtained theoretically and experimentally, has showed their satisfactory correspondence. As a result of the numerical simulation, the temperature fields in the “fuel particle-high-temperature medium” system have been obtained, illustrating the features of the course of the thermochemical reactions of the wood particles ignition under conditions of fragmentation of their surface.

AB - The results of the experimental and theoretical studies of the ignition processes of the woody biomass single particles of a cubic form under conditions of preliminary fragmentation of the particle surface have been presented. It is established experimentally that the increase in the result of the external mechanical influences, in the heat exchange area (due to the formation of grooves and cracks) leads to an acceleration of the ignition process. According to the results of the experiments, a new mathematical model of the ignition process of the wood biomass particle under conditions of near-surface fragmentation, which differs from previously known ones, has been formulated. It describes the thermophysical processes and thermochemical processes and intense phase (evaporation of water) transformations, in conditions of change in the surface relief of the particle, and, accordingly, the density of the heat flux along the particle contour and the concentration of combustible gases in the boundary layer of the particle. The formulated system of the nonlinear partial differential equations in partial derivatives with the corresponding boundary conditions describes the process of ignition in a two-dimensional setting, taking into account the substantial nonuniformity of the temperature field of a wood particle in the induction period. Up to the present time, the mathematical models of such a degree of detailing of the physical processes occurring together during the ignition of wood under the conditions of fragmentation of its surface have not been formulated. The comparative analysis of the ignition delay times (t ign ), obtained theoretically and experimentally, has showed their satisfactory correspondence. As a result of the numerical simulation, the temperature fields in the “fuel particle-high-temperature medium” system have been obtained, illustrating the features of the course of the thermochemical reactions of the wood particles ignition under conditions of fragmentation of their surface.

KW - Evaporation of moisture

KW - Heat and mass transfer

KW - Ignition

KW - Inflammation of volatiles

KW - Surface fragmentation

KW - Thermal preparation of fuel

KW - Wood particle

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DO - 10.1016/j.fuel.2019.03.126

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VL - 252

SP - 19

EP - 36

JO - Fuel

JF - Fuel

SN - 0016-2361

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