The kinetics of typical medical waste pyrolysis based on gaseous evolution behaviour in a micro-fluidised bed reactor

摘要

In order to obtain the kinetic parameters during typical medical waste pyrolysis, the typical medical waste is pyrolysed in a micro-fluidised bed reactor. The gases evolved from the typical medical waste pyrolysis are analysed by a mass spectrometer, and only H2, CH_4, C_2H_2, C_2H_4, C_2H_6, C_3H_5, C_3H_8 and C_4H_4 are observed. According to the gaseous product concentration profiles, the activation energies of gaseous formation are calculated based on the Friedman approach, and the average activation energies of H_2, CH_4, C_2H_2, C_2H_4, C_2H_6, C_3H_6, C_3H_8 and C_4H_4 formation during typical medical waste pyrolysis are in sequence as 65.10, 39.98, 35.17, 38.71, 40.75, 41.79, 58.57 and 63.95kJmol~(-1). Moreover, the activation energy with respect to the gases mixture formation is 52.70kJ mol~(-1). Hence, it is concluded that the activation energy of typical medical waste pyrolysis is 52.70 kJmol~(-1). The model-fitting method is used to determine the mechanism model of medical waste pyrolysis. The results indicate that the chemical reaction (n= 1) model (G(x)=-ln(l-x)) is the optimum.