Thermokinetics and gas emission characteristics of nitrification waste under different oxygen contents by using TG-FTIR technique

Nitrification waste has been a main hazard factor in many fire and explosion accidents; however, its thermal characteristics, which provide critical information for hazard control, have not been extensively studied. Accordingly, this study investigated the thermokinetic parameters and gas emission behaviors of nitrification waste by using thermogravimetric analysis coupled with Fourier transform infrared spectrometry (TG-FTIR). A reaction environment with various oxygen contents (0%, 15%, 21%, and 30%) was created.Both integral method (Starink method)and differential method (Friedman method) were adopted to analyze the activation energy of nitrification waste. The results revealed that the thermal decomposition of nitrification waste could be divided into three stages and that the activation energy of this waste was a quadratic function of the oxygen content. The results of this study can improve the understanding of the thermal behavior of nitrification waste and can thus serve as a reference for the effective prevention of related thermal hazards.