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Combustion, Explosion and Shock Waves

2019 year, number 2

Effect of the Kinetic Scheme of Pyrolysis on Prognostic Estimates of Characteristics of Ignition of Wood Particles

G. V. Kuznetsov, S. V. Syrodoy
Tomsk Polytechnic University, Tomsk 634034 Russia
Keywords: частица древесины, воспламенение, пиролиз, кокс, летучие, кинетическая модель, время задержки зажигания, wood particle, ignition, pyrolysis, coke, volatile, kinetic model, ignition delay

Abstract

The effect of the kinetic model of the thermal decomposition of wood on the results of prognostic modeling of the ignition of wood particles was analyzed. The results of mathematical modeling were verified by experimental studies of the ignition of wood particles in a high-temperature environment. Comparative analysis of the delays of ignition obtained theoretically and experimentally showed their good agreement. The prognostic potential of three substantially different kinetic models of wood pyrolysis was analyzed. It was established that the model of one-step pyrolysis with the formation of gaseous reaction products provides a good description of the thermal decomposition during thermal preparation (deviation from the times obtained using the three-stage pyrolysis model does not exceed 5%) in the whole range of heating conditions. Numerical simulation results show that consideration of thermal decomposition reactions of the second and third levels with the formation of intermediate pyrolysis products (liquid and solid) does not have a significant influence on the characteristics and conditions of ignition of wood particles in a high-temperature gas environment.