Computational particle-fluid dynamics simulation of gas-solid flow in a circulating fluidized bed with air or O2/CO2 as fluidizing gas
Computational particle-fluid dynamics simulation of gas-solid flow in a circulating fluidized bed with air or O2/CO2 as fluidizing gas
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DOI：
10.1016/j.powtec.2017.06.021
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发表时间：
2017-08
影响因子：
5.2
通讯作者：
Mukesh Upadhyay;H. Park;J. Hwang;H. Choi;Ha-Na Jang;Y. Seo
中科院分区：
文献类型：
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作者：
Mukesh Upadhyay;H. Park;J. Hwang;H. Choi;Ha-Na Jang;Y. Seo
采用计算粒子流体动力学（CPFD）模拟方法，研究了空气和O2/CO2作为流化气对冷态循环流化床内气固两相流动的影响。在恒定表观气速下，以空气或三种不同浓度的O2/CO2混合气体为流化气体，将CPFD模拟结果与实验数据进行了比较。模拟结果表明，该模型成功地捕捉到了实验观察到的趋势。对瞬态压力数据进行了详细的统计分析，发现结果因流化使用的是空气还是燃烧气体（O2/CO2）而异。在所有的情况下，流动表现出典型的核心-环状流结构，虽然对于O2/CO2气体的固体体积分数增加的壁区域附近。CPFD的结果提供了洞察气-固流动行为的流化床燃烧器提升管下的氧-燃料流化气氛。
Computational particle-fluid dynamics (CPFD) simulation was carried out to examine the influence of air versus O2/CO2as the fluidizing gas on the hydrodynamics of gas-solid flow in a cold-mode circulating fluidized bed. The CPFD simulation results were compared to the experimental data at constant superficial gas velocity, using air or mixed O2/CO2in three different concentrations as the fluidizing gas. The simulation results showed that the model successfully captured the experimentally observed trends. A detailed statistical analysis was carried out on the transient pressure data, and results were found to vary depending on whether air or combustion gases (O2/CO2) were used for fluidization. In all cases, the flow exhibits a typical core-annular flow structure, although for O2/CO2gas the solid volume fraction increases near the wall region. The CPFD results provided insights into the gas-solid flow behavior in a fluidized bed combustor riser under an oxy-fuel fluidizing atmosphere.