Plasma-enhanced electrostatic precipitation of diesel exhaust particulates using nanosecond high voltage pulse discharge for mobile source emission control
Plasma-enhanced electrostatic precipitation of diesel exhaust particulates using nanosecond high voltage pulse discharge for mobile source emission control
复制标题
利用纳秒高压脉冲放电对柴油机尾气颗粒物进行等离子体增强静电沉淀，用于移动源排放控制
DOI：
10.1016/j.scitotenv.2022.158181
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发表时间：
2022
影响因子：
9.8
通讯作者：
Singleton, Dan
中科院分区：
文献类型：
--
作者：
Zhang, Boxin;Aravind, Indu;Yang, Sisi;Weng, Sizhe;Zhao, Bofan;Schroeder, Christi;Schroeder, William;Thomas, Mark;Umstattd, Ryan;Singleton, Dan
本研究报告的增强静电除尘（ESP）的柴油机排气微粒使用高压纳秒脉冲放电结合负直流（DC）偏置电压。高电压（20 kV）纳秒脉冲产生的离子密度比由标准的仅DC ESP产生的电晕中的离子密度高几个数量级。这种等离子体增强静电除尘器（PE-ESP）表现出95%的PM补救并且消耗少于1%的发动机功率（即，37千瓦柴油发动机在75%负荷下）。虽然仅DC ESP补救随施加电压线性增加，但等离子体增强ESP在负DC偏压的施加范围内保持近似恒定。PE-ESP过程的数值模拟与直流实验结果一致，使我们能够验证纳秒高压脉冲等离子体提供的基于电荷的增强机制。具有不同流速的两种不同反应器配置产生相同的修复值，尽管其中一种具有另一种的一半流速。这表明反应器可以在不牺牲性能的情况下做得更小。在这里，这项研究发现，等离子体增强，使高修复值在低直流电压和较小的ESP反应器，以高修复。
This study reports enhancement in the electrostatic precipitation (ESP) of diesel engine exhaust particulates using high voltage nanosecond pulse discharge in conjunction with a negative direct current (DC) bias voltage. The high voltage (20 kV) nanosecond pulses produce ion densities that are several orders of magnitude higher than those in the corona produced by a standard DC-only ESP. This plasma-enhanced electrostatic precipitator (PE-ESP) demonstrated 95 % remediation of PM and consumes less than 1 % of the engine power (i.e., 37 kW diesel engine at 75 % load). While the DC-only ESP remediation increases linearly with applied voltage, the plasma-enhanced ESP remains approximately constant over the applied range of negative DC biases. Numerical simulations of the PE-ESP process agree with the DC-only experimental results and enable us to verify the charge-based mechanism of enhancement provided by the nanosecond high voltage pulse plasma. Two different reactor configurations with different flow rates yielded the same remediation values despite one having half the flow rate of the other. This indicates that the reactor can be made even smaller without sacrificing performance. Here, this study finds that the plasma enhancement enables high remediation values at low DC voltages and smaller ESP reactors to be made with high remediation.