Analysis of particle heating and devolatilization during rapid coal pyrolysis in a thermal plasma reactor
Analysis of particle heating and devolatilization during rapid coal pyrolysis in a thermal plasma reactor
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热等离子体反应器中煤快速热解过程中颗粒加热和脱挥分析
DOI：
10.1016/j.fuproc.2012.02.009
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发表时间：
2012-08
影响因子：
7.5
通讯作者：
Guo Cliff Yi
中科院分区：
文献类型：
--
作者：
Yan Binhang;Cheng Yi;Jin Yong;Guo Cliff Yi
利用热等离子体将煤热解为乙炔提供了一条直接利用煤炭资源制取化学品的途径，其中反应器内的温度场对煤的脱挥发性能起着主导作用。建立了描述超高温下煤在反应器内快速热解过程的离散相流体力学综合模型(CFD-DPM)。基于该模型的数值模拟有助于理解煤在毫秒级热解过程中复杂的气固反应行为。将固体材料内部的热传导、释放的挥发性气体的扩散、煤的脱挥发和焦油裂解反应等粒子尺度物理结合在一起。基于煤结构的物理和化学变化，采用改进的化学渗滤脱挥发(CPD)模型来描述快速加热煤的脱挥发行为。5 MW等离子体反应器的运行经验表明，该模型能较好地描述具有毫秒级停留时间的复杂气固反应行为。模拟结果表明，煤粒在高温区的加热和脱挥受温度等级和停留时间的强烈影响(S)。在反应堆中高度集中的能量输入可能不会强化反应堆的性能。作为一种潜在的解决方案，多级加热设计将提供更多的灵活性，以便在相同的能量输入下有效地调整脱挥性能。
Using thermal plasma for coal pyrolysis to acetylene provides a direct route to make chemicals from coal resources, where the temperature field in the reactor plays a dominant role in the performance of coal devolatilization. A comprehensive computational fluid dynamics with discrete phase model (CFD-DPM) has been established to describe the rapid coal pyrolysis process in a reactor under ultra-high temperatures. The simulations based on this model helped to understand the complex gas–particle reaction behavior in the millisecond process of coal pyrolysis. The particle-scale physics such as the heat conduction inside solid materials, diffusion of released volatile gases, coal devolatilization, and tar cracking reactions were incorporated. The improved chemical percolation devolatilization (CPD) model was applied to describe the devolatilization behavior of rapidly heated coal based on the physical and chemical transformations of the coal structure. This model was proved to be qualified for describing the complex gas–particle reaction behavior with milliseconds residence time by the operation experience of a 5-MW plasma reactor. Then the simulations revealed the fact that the particle heating and devolatilization are strongly affected by the grade of the temperature and the residence time of coal particles in the high temperature zone(s). Highly concentrated energy input in the reactor may not intensify the reactor performance. As a potential solution, multi-stage heating design would provide more flexibilities to effectively adjust the devolatilization performances under the same energy input.
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影响因子：
5.3
作者：
Y. Shuang;Changning Wu;Binhang Yan;Yi Cheng
通讯作者：
Y. Shuang;Changning Wu;Binhang Yan;Yi Cheng
影响因子：
7.4
作者：
H. Baumann;D. Bittner;H. Beiers;J. Klein;H. Jüntgen
通讯作者：
H. Baumann;D. Bittner;H. Beiers;J. Klein;H. Jüntgen
影响因子：
2.1
作者：
Yi Cheng;Jiaqi Chen;Yulong Ding;X. Xiong;Yong Jin
通讯作者：
Yi Cheng;Jiaqi Chen;Yulong Ding;X. Xiong;Yong Jin
影响因子：
7.4
作者：
D. Bittner;H. Baumann;J. Klein
通讯作者：
D. Bittner;H. Baumann;J. Klein
影响因子：
4.4
作者：
F. Higuera
通讯作者：
F. Higuera