Title of article :
Interactions between oil shale and its semi-coke during co-combustion
Author/Authors :
Wang، نويسنده , , Qing and Wang، نويسنده , , Haigang and Sun، نويسنده , , Baizhong and Bai، نويسنده , , Jingru and Guan، نويسنده , , Xiaohui، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2009
Pages :
10
From page :
1520
To page :
1529
Abstract :
In the present work, thermogravimetric analysis was employed to investigate the interactions between oil shale and its semi-coke during co-combustion process. During the test, the blends of semi-coke and oil shale were prepared at different blending ratios of 1:0, 4:1, 3:1, 2:1, 1:1, and 0:1. The results indicated some interactions were detected between oil shale and semi-coke during the tests. The rapid combustion of organic matter in oil shale, which led to the fuel particle temperature’s rapid increase and made semi-coke ignite in advance, improved the co-combustion characteristics in terms of ignition temperature (Ti), the temperature reaching the maximum mass loss rate (Tmax), the maximum mass loss rate (Rmax), the combustibility index (C) and the specific reactivity of the co-combustion. With the increase in semi-coke mass fraction in the blends, the specific reactivity of the samples was found to decrease gradually due to lower volatile content and high carbon condensation structure in semi-coke. As the temperature increased, the specific reactivity of the samples first gradually increased, then decreased attributed to the oxidation of selectivity. The poor diffusion caused mainly by the ash shells made the decomposition of minerals more complicated. It was also analyzed that the ‘particle groups’ phenomenon that the dispersed particles are agglomerated by some forces in semi-coke ash went against the decomposition of minerals. tion energies E from distributed activation energy (DAEM) slowly decreased at the initial stage, then increased sharply over a narrow conversion region, which indicted a difficult burnout stage. Meantime, a power law model was employed to investigate quantitatively the interactions. The experimental reaction orders could be predicted accurately from the calculated values. At the third stage, the kinetic parameters E3 and A3 were almost as much as the calculated values. At the low temperature region (470–540 °C), there was little difference between kinetic parameters E and A from the experiment data and the calculated data.
Keywords :
Thermogravimetric analysis co-combustion , Semi-coke , Oil shale , Reactivity
Journal title :
Fuel
Serial Year :
2009
Journal title :
Fuel
Record number :
1465046
Link To Document :
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