CFD modeling of coal pyrolysis in externally heated fixed-bed reactor
CFD modeling of coal pyrolysis in externally heated fixed-bed reactor
复制标题
外热式固定床反应器中煤热解的 CFD 建模
DOI：
10.1016/j.fuel.2018.06.100
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发表时间：
2018-12
期刊：
影响因子：
7.4
通讯作者：
Xiaoxing Liu
中科院分区：
文献类型：
--
作者：
Yanan Qian;Yin Yu;Guangwen Xu;Xiaoxing Liu
在实验室规模的外热式固定床反应器中，建立了低阶次烟煤热解的三维瞬态模型。模型中考虑了水分蒸发和挥发物的释放。首先通过反应器中心温度的演变验证了模拟的正确性。进一步分析了床层温度的演变、气相产物的生成、空隙率的变化及其对气相产物流动行为的影响。结果表明，水分的相变决定了热解过程，延缓了煤内区温度上升到沸腾温度以上，从而延缓了热解的开始。空隙率径向分布的不均匀性导致了内低温区生成的气态产物在流出反应器之前倾向于径向流向加热壁的现象。分析表明，在挥发分强烈释放的温度范围内，主要的传热机制是辐射。
A three dimensional transient model was developed to simulate the pyrolysis process of low-rank sub-bituminous coal in a laboratory-scale externally heated fixed-bed reactor. The water evaporation and the release of volatiles were taken into account in the model. The simulation was first validated by the central temperature evolution of reactor. The evolution of bed temperature, generation of gaseous products, variation of voidage and its influence on the flow behavior of gaseous products were further analyzed. The obtained results show that the phase change of moisture determined the heating process, delaying the temperature of inner coal zone increase above the boiling temperature and consequently the start of pyrolysis. The non-uniform radial distribution of voidage led to the phenomenon that gaseous products generated in the inner low temperature zone tended to flow radially towards heating wall before flowing out the reactor. Analyses indicate that in the temperature range of intense volatiles release the dominant heat transfer mechanism was radiation.
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DOI：
10.1021/j150658a046
发表时间：
1984-07
期刊：
The Journal of Physical Chemistry
影响因子：
--
作者：
G. Rubel;J. Gentry
通讯作者：
G. Rubel;J. Gentry
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
影响因子：
7.5
作者：
Yan Binhang;Cheng Yi;Jin Yong;Guo Cliff Yi
通讯作者：
Guo Cliff Yi
影响因子：
7.4
作者：
H. Jeong;In Sik Hwang;Sang Shin Park;Jungho Hwang
通讯作者：
H. Jeong;In Sik Hwang;Sang Shin Park;Jungho Hwang
DOI：
10.1142/9789814460286_0004
发表时间：
2002
期刊：
--
影响因子：
--
作者：
W. Lee
通讯作者：
W. Lee
影响因子：
4.2
作者：
Z. Shu;Chuigang Fan;Songgeng Li;Junwu Wang
通讯作者：
Z. Shu;Chuigang Fan;Songgeng Li;Junwu Wang