Effect of hydrodynamic behavior on electrostatic potential distribution in gas–solid fluidized bed
Effect of hydrodynamic behavior on electrostatic potential distribution in gas–solid fluidized bed
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DOI：
10.1016/j.powtec.2012.09.025
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发表时间：
2013-02
影响因子：
5.2
通讯作者：
Yefeng Zhou;Congjing Ren;Jingdai Wang;Yongrong Yang;Dong Kezeng
中科院分区：
文献类型：
--
作者：
Yefeng Zhou;Congjing Ren;Jingdai Wang;Yongrong Yang;Dong Kezeng
在具有新设计的进气结构的气固流化床中，气体单独进入核心区或环空区，观察流体动力学行为的变化，从而调节和控制静电势分布。根据进行的实验，观察到上部颗粒循环区域的正电势，而底部显示负电特性。与正常进气条件相比，具有特定核心-环空进气结构的流化床表现不同。随着表观气体速度的增加，当流化气体刚刚进入核心区时，带正电区以及上循环区扩大；相反，当流化气体刚进入环形区时，负电区随表观气速而扩展。当表观速度较低时，中心静电势的绝对值小于壁面静电势的绝对值，而当速度变高时，两个势值相互接近。此外，为了理解流体动力学和静电场，提出了关于流型对静电势分布影响的初步机制讨论，并得到了实验结果的验证。
In a gas–solid fluidized bed with a newly-designed gas-inlet structure, with gas entering exclusively in the core or annulus zone separately, changes in the hydrodynamic behavior are observed and thus the electrostatic potential distribution is regulated and controlled. From experiments conducted, electropositive potential in the upper particle circulation zone is observed while the bottom part displays electronegative characteristics. Compared to that with a normal gas-inlet condition, the fluidized bed with specific core–annulus gas-inlet structure behaves differently. As the superficial gas velocity is increased, the positively charged zone, as well as the upper circulation zone, expands when the fluidizing gas just enters the core zone; on the contrary, the negatively charged zone expands with the superficial gas velocity when fluidizing gas just enters the annular zone. At lower superficial velocities, the absolute value of the electrostatic potential in the center is less than that at the wall, while the two potential values approach each other when the velocity becomes higher. Moreover, a preliminary mechanism discussion about the effect of the flow pattern on the electrostatic potential distribution has been put forward for understanding the hydrodynamics and the electrostatic field, which is verified with the experimental results.