Kinetic models for the oxy-fuel combustion of coal and coal/biomass blend chars obtained in N2 and CO2 atmospheres
Kinetic models for the oxy-fuel combustion of coal and coal/biomass blend chars obtained in N2 and CO2 atmospheres
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DOI：
10.1016/j.energy.2012.10.033
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发表时间：
2012-12-01
期刊：
影响因子：
9
通讯作者：
Rubiera, F.
中科院分区：
文献类型：
--
作者：
Gil, M. V.;Riaza, J.;Rubiera, F.
采用非等温热重法研究了5种煤焦、1种生物质半焦和2种煤/生物质半焦混合物在富氧燃烧气氛（30%O-2-70%CO2）中3种升温速率下的热反应性和动力学。在1273 K、N2和CO2气氛下，在气流床反应器中脱挥发分得到燃料半焦。采用三种具有代表性的n阶气固模型--体积模型（VM）、颗粒模型（GM）和随机孔隙模型（RPM）来描述煤焦的反应行为。RPM模型被认为是最好的描述高煤阶煤焦的反应性，而VM是最好的描述烟煤焦，生物质焦和煤-生物质混合焦的反应性的模型。在氧气含量为30%的富氧燃烧气氛中，在N2和CO2中获得的焦的动力学参数进行了比较，但没有观察到相关的差异。研究了烟煤（90%wt.）和生物质（10%wt.）炭类似于掩盖生物质影响的单独煤的炭。同样，在混合物的富氧燃料燃烧期间，未检测到高煤阶煤和生物质焦之间的相互作用。(C)2012爱思唯尔有限公司保留所有权利。
The thermal reactivity and kinetics of five coal chars, a biomass char, and two coal/biomass char blends in an oxy-fuel combustion atmosphere (30%O-2-70%CO2) were studied using the non-isothermal thermogravimetric method at three heating rates. Fuel chars were obtained by devolatilization in an entrained flow reactor at 1273 K under N-2 and CO2 atmospheres. Three nth-order representative gas-solid models - the volumetric model (VM), the grain model (GM) and the random pore model (RPM) were employed to describe the reactive behaviour of the chars. The RPM model was found to be the best for describing the reactivity of the high rank coal chars, while VM was the model that best described the reactivity of the bituminous coal chars, the biomass char and the coal-biomass blend char. The kinetic parameters of the chars obtained in N-2 and CO2 in an oxy-fuel combustion atmosphere with 30% of oxygen were compared, but no relevant differences were observed. The behaviour of the blend of the bituminous coal (90%wt.) and the biomass (10%wt.) chars resembled that of the individual coal concealing the effect of the biomass. Likewise, no interaction was detected between the high rank coal and the biomass chars during oxy-fuel combustion of the blend. (C) 2012 Elsevier Ltd. All rights reserved.