Effect of the kinetic scheme of pyrolysis on prognostic estimates of characteristics of ignition of wood particles

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.