TY - JOUR

T1 - Numerical study of polyethylene burning in counterflow

T2 - Effect of pyrolysis kinetics and composition of pyrolysis products

AU - Karpov, A. I.

AU - Korobeinichev, O. P.

AU - Bolkisev, A. A.

AU - Shaklein, A. A.

AU - Shmakov, A. G.

AU - Paletsky, A. A.

AU - Gonchikzhapov, M. B.

N1 - Publisher Copyright: Copyright © 2018 John Wiley & Sons, Ltd.

PY - 2018/11/1

Y1 - 2018/11/1

N2 - The burning behavior of polyethylene in the counterflow of oxidizing air has been studied numerically with a coupled model describing feedback heat and mass transfer between gas-phase flame and polymeric solid fuel. A 2-dimensional elliptic equation in axisymmetric formulation (revealing the cylindrical shape of the polymer sample used in the experiment) has been employed to simulate heat transfer in solid fuel, and a set of 1-dimensional hyperbolic equations has been used to determine the solid-to-gas conversion degree of the pyrolysis reaction. Four sets of products compositions and two modifications for the kinetic parameters of solid fuel pyrolysis reaction have been taken into account. Gas-phase formulation is presented by set of 1-dimensional conservation equations for multi-component flow with detailed kinetic mechanism of combustion. The profiles of temperature and species concentrations in the flame zone have been calculated and compared with the results of experimental study of combustion of ultrahigh molecular weight polyethylene. Higher hydrocarbon composition (dodecane) has been found to show the best agreement between the temperature and species concentration profiles with the measurements, especially for the low-level mass fractions of the by-product components-propylene, butadiene, and benzene.

AB - The burning behavior of polyethylene in the counterflow of oxidizing air has been studied numerically with a coupled model describing feedback heat and mass transfer between gas-phase flame and polymeric solid fuel. A 2-dimensional elliptic equation in axisymmetric formulation (revealing the cylindrical shape of the polymer sample used in the experiment) has been employed to simulate heat transfer in solid fuel, and a set of 1-dimensional hyperbolic equations has been used to determine the solid-to-gas conversion degree of the pyrolysis reaction. Four sets of products compositions and two modifications for the kinetic parameters of solid fuel pyrolysis reaction have been taken into account. Gas-phase formulation is presented by set of 1-dimensional conservation equations for multi-component flow with detailed kinetic mechanism of combustion. The profiles of temperature and species concentrations in the flame zone have been calculated and compared with the results of experimental study of combustion of ultrahigh molecular weight polyethylene. Higher hydrocarbon composition (dodecane) has been found to show the best agreement between the temperature and species concentration profiles with the measurements, especially for the low-level mass fractions of the by-product components-propylene, butadiene, and benzene.

KW - Counterflow combustion

KW - Numerical modeling

KW - Polyethylene burning

KW - Pyrolysis kinetics

KW - Pyrolysis products

KW - counterflow combustion

KW - MEAN ABSORPTION-COEFFICIENTS

KW - POLYMERS

KW - COMBUSTION

KW - H2O

KW - MOLECULAR-WEIGHT POLYETHYLENE

KW - DIFFUSION FLAMES

KW - polyethylene burning

KW - CO2

KW - DIFFERENTIAL SCANNING CALORIMETRY

KW - pyrolysis kinetics

KW - EXTINCTION

KW - numerical modeling

KW - pyrolysis products

KW - FUELS

UR - http://www.scopus.com/inward/record.url?scp=85047810168&partnerID=8YFLogxK

U2 - 10.1002/fam.2638

DO - 10.1002/fam.2638

M3 - Article

AN - SCOPUS:85047810168

VL - 42

SP - 826

EP - 833

JO - Fire and Materials

JF - Fire and Materials

SN - 0308-0501

IS - 7

ER -