Modelling of isothermal and dynamic pyrolysis of plastics considering non-homogeneous temperature distribution and detailed degradation mechanism

摘要: Abstract The kinetics of pyrolysis plastics are important to predict the formation gaseous compounds from plastic waste. A common method determine kinetic parameters is adapt models conversion curves gained either isothermal or dynamic experiments. Recent studies about polystyrene showed considerable discrepancies derived and Explanation for this may be supplied by heat transfer limitations complex degradation mechanisms that not in agreement with simple model. In first part investigation non-stationary inside sample numerically simulated. comparison results simulating cases reveal no significant shift adapted overall if modest heating rates sizes applied. Therefore, second a model considered including more detailed scheme which comprises statistic scission polymer chain subsequent depolymerization radical. rate equations polydispers species solved via moments. simulations show good correspondence coefficients initiation reactions. However, when experiments changes found certain range reaction rates. It demonstrated exist yield differ up 100% input due inapplicable simplification