Characteristics of negative DC corona discharge in a wire-plate configuration at high temperatures
Characteristics of negative DC corona discharge in a wire-plate configuration at high temperatures
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DOI：
10.1016/j.seppur.2014.10.026
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发表时间：
2015-01-02
影响因子：
8.6
通讯作者：
Cen, Kefa
中科院分区：
文献类型：
--
作者：
Yan, Pei;Zheng, Chenghang;Cen, Kefa
有人提议使用高温静电除尘器来清除燃料或烟道气中的灰尘，以提高能源效率或避免损坏下游设备。本文试图提供一个全面的了解负直流电晕放电，并找到方法来提高电晕稳定性在高温下。在293 ~ 1173 K温度范围内，研究了不同放电间隙和电极几何形状的线-板放电结构的电晕放电特性。分析了V-I特性，包括电晕起始/火花电压、工作电压范围和电晕电流组成。放电电流密度随着温度的升高而增加，并且电子携带电流在高温下变得显著。例如，在10 kV的外加电压下，在1073 K下，电子携带的电流构成了总放电电流的40%。所施加的电压范围随着温度的升高而减小。当温度超过1073 K，放电间隙小于50 mm时，电离系数和电子数大大增加，电晕放电变得不稳定，局部击穿频繁发生。当放电间隙从30 mm增加到70 mm时，在1073 K时，工作电压范围从8.2 kV增加到13.6 kV。与丝状和螺旋形电极相比，带状电极更容易产生火花。导线直径对高温下火花电压和电晕稳定性的影响很小。(C)2014爱思唯尔有限公司版权所有。
High-temperature electrostatic precipitators for removing dust from fuel or flue gases were proposed to improve energy efficiency or to avoid damaging downstream equipment. This paper attempts to provide a comprehensive understanding of negative DC corona discharges and find ways to increase corona stability at high temperatures. The characteristics of corona discharges were studied in a wire-plate discharge configuration under different discharge gaps and electrode geometries at temperatures ranging from 293 K to 1173 K. The V-I characteristics were analyzed, including corona onset/spark voltages, operating voltage ranges, and corona current compositions. The discharge current density increases as the temperature increases, and the electron-carried current becomes significant at high temperatures. For example, the electron-carried current makes up similar to 40% of the total discharge current at 1073 K under an applied voltage of 10 kV. The applied voltage range decreases as the temperature increases. The corona discharges become unstable, and localized breakdowns occur frequently when the temperature exceeds 1073 K and the discharge gap is less than 50 mm, because the ionization coefficient and the number of electrons greatly increase. The operating voltage range increases from 8.2 kV to 13.6 kV at 1073 K when the discharge gap increases from 30 mm to 70 mm. Compared with the wire and spiral electrodes, the ribbon electrodes produce sparks more easily. The wire diameter has little influence on the spark voltage and corona stability at high temperatures. (C) 2014 Elsevier B.V. All rights reserved.