CFD modelling of oxy-coal combustion in an entrained flow reactor
CFD modelling of oxy-coal combustion in an entrained flow reactor
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DOI：
10.1016/j.fuproc.2011.03.010
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发表时间：
2011-08-01
影响因子：
7.5
通讯作者：
Rubiera, F.
中科院分区：
文献类型：
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作者：
Alvarez, L.;Gharebaghi, M.;Rubiera, F.
富氧燃烧被视为新的和现有燃煤发电站二氧化碳捕集的主要选择之一。煤与氧气和再循环烟道气的混合物一起燃烧，以获得富含二氧化碳的流，准备用于封存。使用三种不同挥发物含量的煤，在气流床反应器 (EFR) 中进行不同 O-2/CO2 (21-35% vol O-2) 气氛下煤燃烧的计算流体动力学 (Cm) 测试。预测了温度分布、燃烧速率、燃尽和主要物质（例如 O-2、CO2、CO）的浓度，并与空气参考案例进行了比较。由于 N-2 和 CO2 之间气体特性的差异，与空气参考情况相比，在 21% O-2/79% CO2 环境中观察到气体温度和燃烧速率降低。 EFR 中获得的实验煤燃尽率用于测试 CFD 模型的准确性。数值结果表明，对于相同的氧气浓度（21%），当用 CO2 代替 N2 时，煤的燃尽量有所减少，但当氧气浓度高于 30% 时，O-2/CO2 气氛有所改善。富氧煤燃烧的数值结果与实验结果非常吻合。 (C) 2011 Elsevier B.V. 保留所有权利。
Oxy-fuel combustion is seen as one of the major options for CO2 capture for both new and existing coal fired power stations. Coal is burned with a mixture of oxygen and recycled flue gas to obtain a rich CO2 stream ready for sequestration. Computational fluid dynamics (Cm) tests for coal combustion under different O-2/CO2 (21-35% vol O-2) atmospheres in an entrained flow reactor (EFR) were carried out using three coals of different volatile matter content. The temperature profiles, burning rates, burnout and concentration of major species, such as O-2, CO2, CO, were predicted and compared with an air reference case. A decrease in gas temperature and burning rate was observed for 21% O-2/79% CO2 environment in comparison to the air reference case due to the difference in gas properties between N-2 and CO2. Experimental coal burnouts obtained in the EFR, were used to test the accuracy of the CFD model. The numerical results showed a decrease in coal burnout when N2 was replaced by CO2 for the same oxygen concentration (21%), but an improvement in the O-2/CO2 atmosphere for an oxygen concentration higher than 30%. The numerical results for oxy-coal combustion were in good agreement with the experimental results. (C) 2011 Elsevier B.V. All rights reserved.