Experimental and kinetic investigation of the pyrolysis, combustion, and gasification of deoiled asphalt.

Zhang, Qian; Li, Qingfeng; Zhang, Linxian; Fang, Yitian; Wang, Zhiqing

The pyrolysis, combustion, and gasification behaviors of deoiled asphalt were studied by a thermogravimetric analyzer and the kinetics were also analyzed using a multi-stage first-order integral model. All the experiments were conducted at non-isothermal conditions with heating rates range of 10-40 K min under N (pyrolysis), air (combustion), or CO (gasification) atmosphere, respectively. The results showed that, for pyrolysis, the reaction mainly occurred between 498 and 798 K and could be divided into two stages: the first was caused by the volatilization of small molecules and the second probably due to the cracking reactions. For combustion, the mass loss process could be divided into three stages: the devolatilization and oxidation first, the ignition and combustion of the volatiles second, and finally the combustion of the formed char. Under CO atmosphere, the mass loss behavior was similar with that of the N atmosphere at lower temperatures, but when the temperature was higher than 1,233 K, the gasification reaction obviously happened. The results of kinetic investigation showed that the multi-stage first-order integral method agreed well with the above experiments.

CHEMICAL kinetics; PYROLYSIS; COMBUSTION gases; THERMOGRAVIMETRY; ASPHALT; THERMAL analysis

Journal of Thermal Analysis & Calorimetry, 2014, Vol 115, Issue 2, p1929

1388-6150

Academic Journal

10.1007/s10973-013-3370-2