关键词:

热重, 半焦, 燃烧, 动力学, DAEM, Coats-Redfern

Abstract: The combustion kinetics of Shenmu char, prepared at 900℃ in Ar atmosphere for 30min, was systematically investigated by using isothermal and temperature-programmed TG technique. The combustion kinetics was analyzed using the DAEM (distributed activation energy model) and the Coats-Redfern integration method. The difference of these two methods was compared. The results indicated that during isothermal combustion and temperature programmed combustion process, with increasing combustion conversion, the specific combustion rate increased and the combustion activation energy showed different changes. DAEM and Coats-Redfern placed the emphasis on different aspects of combustion and obtained different results.The isothermal TG technology at a lower temperature could reduce the external diffusion effect during combustion as much as possible. Therefore, the kinetic results calculated from isothermal TG technology were close to the intrinsic values.

Key words:

热重, 半焦, 燃烧, 动力学, DAEM, Coats-Redfern