Effect of plasma irradiation on the fine particle behavior in a spouted bed
Effect of plasma irradiation on the fine particle behavior in a spouted bed
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DOI：
10.1016/j.powtec.2018.11.044
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发表时间：
2019-02
影响因子：
5.2
通讯作者：
Baiqian Zhang;Nobusuke Kobayashi;Y. Itaya
中科院分区：
文献类型：
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作者：
Baiqian Zhang;Nobusuke Kobayashi;Y. Itaya
喷动床与非热等离子体的结合已广泛应用于工业化学过程中。然而，等离子体照射下喷动床中粒子的详细行为仍然未知。在本研究中，在介质阻挡放电（DBD）等离子体发生器的照射下进行了细小的白色熔融氧化铝颗粒的流化实验，并评估了等离子体照射对喷射床中颗粒行为的影响。改变静态床高、气体速度、施加电压和工作气体等基本操作参数，并测量等离子体增强的最小喷动速度、压降、床层空隙率和喷动床温度，以了解细颗粒的流化行为。结果，无论初始静态床高度如何，随着施加电压增加到高电压，最小喷动速度下降，而流化点之前固体床的空隙率随着施加电压的增加而增加。流化行为随工作气体的不同而变化，N2的最小喷动速度远高于Ar。当施加等离子体时，床和颗粒表面的温度没有表现出明显的变化。所提出的机制表明，气体电离改善了颗粒之间的相互作用，并可能导致最小喷动速度降低。
The combination of a spouted bed with non-thermal plasma has been used widely in industrial chemical processes. However, the detailed behavior of particles in a spouted bed with irradiation of plasma is still unknown. In this study, a fluidization experiment of fine white fused alumina particles under the irradiation of a dielectric barrier discharge (DBD) plasma generator was performed, and the effect of the plasma irradiation on the particle behavior in a spouted bed was evaluated. Essential operation parameters, such as static bed height, gas velocity, applied voltage, and working gases were changed, and the minimum spouted velocity, pressure drop, bed void fraction and spouted bed temperature with plasma enhancement were measured to understand the fluidization behavior of fine particles. As the results, the minimum spouted velocity decreased as the applied voltage increased to a high voltage, irrespective of the initial static bed height, while the void fraction of the solid bed before the fluidization point increased with an increase in the applied voltage. Fluidization behavior varied with the working gas, and the minimum spouted velocity with N2was much higher than that of Ar. The temperature of the bed and particle surface did not show apparent changes when the plasma was applied. The proposed mechanism shows that the ionization of gas improves the interaction between particles and may cause the minimum spouted velocity to decrease.