Kinetic Parameters and Reactivity for the Steam Gasification of Coal Chars Obtained under Different Pyrolysis Temperatures and Pressures
Kinetic Parameters and Reactivity for the Steam Gasification of Coal Chars Obtained under Different Pyrolysis Temperatures and Pressures
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DOI：
10.1021/ef200411j
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发表时间：
2011-07
期刊：
影响因子：
5.3
通讯作者：
J. Fermoso;M. V. Gil;S. García;C. Pevida;J. J. Pis-J.;F. Rubiera
中科院分区：
文献类型：
--
作者：
J. Fermoso;M. V. Gil;S. García;C. Pevida;J. J. Pis-J.;F. Rubiera
研究了不同脱挥条件（压力和温度）对煤焦水蒸气气化动力学和反应性的影响。为此，选择了五种不同煤阶的煤：褐煤（LT），两种高挥发性烟煤（DT和SA），低挥发性烟煤（DI）和半无烟煤（HV）。煤焦通过在新型加压固定床反应器中在800、900和1000 °C的温度和1、5、10和20个大气压的压力下脱挥发分而获得。采用等温热重分析法研究了在不同温度和水蒸气气氛下，半焦的反应活性。采用无规孔模型（RPM）对煤焦的反应行为进行了评价，该模型较好地描述了煤焦的水蒸气气化过程。气化表观反应速率随脱挥压力的增大而增大，随脱挥温度的升高而减小。
The effect of devolatilization conditions (pressure and temperature) on the steam gasification kinetics and reactivity of coal chars was investigated. For this purpose, five different rank coals were selected: a lignite (LT), two high-volatile bituminous coals (DT and SA), a low-volatile bituminous coal (DI), and a semianthracite (HV). The coal chars were obtained by devolatilization in a novel pressurized fixed-bed reactor at temperatures of 800, 900, and 1000 °C and pressures of 1, 5, 10, and 20 atm. The reactivity of the chars was studied by isothermal thermogravimetric analysis in a kinetically controlled regime at different temperatures under a steam atmosphere. The reactive behavior of the chars was evaluated by means of the random pore model (RPM), which satisfactorily described the steam gasification of the coal chars. The gasification apparent reaction rate increased as the devolatilization pressure increased, whereas this parameter decreased as the devolatilization temperature increased.