Experimental investigation of electrostatic reduction in a gas-solid fluidized bed by an in situ corona charge eliminator
Experimental investigation of electrostatic reduction in a gas-solid fluidized bed by an in situ corona charge eliminator
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原位电晕电荷消除器气固流化床静电还原实验研究
DOI：
10.1021/ie501584v
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发表时间：
2014
影响因子：
4.2
通讯作者：
Yang Yongrong
中科院分区：
文献类型：
--
作者：
Dong Kezeng;Zhang Qing;Huang Zhengliang;Liao Zuwei;Wang Jingdai;Yang Yongrong
由于摩擦带电而在绝缘颗粒上积累过量电荷可导致各种粉末工业危害。本工作开发了一种新型的原位电晕消除器（ICCE），用于中和气固流化床中的静电荷。为了验证该方法的可行性，系统地研究了ICCE前后静电电压、荷质比和电场的变化。结果表明，当气速小于2U/Umf时，颗粒带电量减少，负电晕放电引起极性反转。随着气体速度的增加，颗粒被更多地充电，并且颗粒上的电荷仅被相同的电晕放电部分中和。进一步的分析表明，电荷中和效率显着影响的摩擦和电晕充电过程。研究发现，表观气速对上述两个充电过程有很大的影响，较大的气速有利于电中和效率的提高。此外，施加ICCE后颗粒的平衡电荷强烈依赖于流化床中的初始电荷积累。
Accumulation of excess charges on insulated particles due to triboelectric charging can cause various powder industrial hazards. This work developed a novel in situ corona charge eliminator (ICCE) to neutralize the electrostatic charge in a gas–solid fluidized bed. In order to verify the feasibility of this method, variation of the electrostatic voltage, charge-to-mass ratio, and electric field before and after the application of ICCE was systemically investigated. The results showed that, under gas velocities of less than 2U/Umf, particles were less charged, and the negative corona discharge caused a polarity reversal. As the gas velocity was increased, particles were more charged, and the charges on the particles were only partially neutralized by an identical corona discharge. Further analyses indicate that the charge neutralization efficiency was significantly influenced by both the triboelectric- and corona-charging processes. The superficial gas velocity was found to have a strong influence on the above two charging processes, and the charge neutralization efficiency favored a larger gas velocity. Besides, the equilibrium charge of the particles after the application of ICCE strongly depended on the initial charge accumulation in the fluidized bed.