CONTROL OF NOX BY POSITIVE AND NEGATIVE PULSED CORONA DISCHARGES
CONTROL OF NOX BY POSITIVE AND NEGATIVE PULSED CORONA DISCHARGES
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DOI：
10.1109/28.54266
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发表时间：
1990-03-01
影响因子：
4.4
通讯作者：
NAKAO, H
中科院分区：
文献类型：
--
作者：
MASUDA, S;NAKAO, H
脉冲诱导等离子体化学过程（Pulse-induced plasma chemical process，PPCP）是一种具有巨大应用潜力的新型处理方法，包括从燃烧气体中去除NO、SO2、HCl、Hg蒸气和其他气态污染物，合成新的气态和固态物质，生产超细颗粒材料，表面处理，这是因为PPCP可以提高林德常压电子温度，以产生活性化学物种，如OH自由基、O、O3、O2、O2、N、N2等，而不升高离子温度，这只有在低压条件下通过高频辉光放电才可能实现。作者开发了一种可靠的纳秒脉冲高压发生器，允许连续操作所需的实现PPCP作为工业设备。作为其系列研究项目之一，作者对PPCP烟气脱硝和脱硫进行了研究，证实了正负脉冲脱硝都是可行的，而脱硫只能用正脉冲。NO被PPCP氧化成NO，NO被PPCP再次去除。采用正脉冲的PPCP比适用于电除尘器的负脉冲的反应速度高一个数量级以上。反应速度通过提高峰值场强而大大提高，这需要使用非常尖锐的脉冲。提高脉冲频率、降低气体温度和使用尖锐电晕线也可提高速度。NO的氧化和NO2的去除可以在没有O2和水分的情况下进行，但它们会大大增强。NH3的加入也增强了NO2-去除，可能是通过其从气相中的NO2-清除作用，而它不增强NO-氧化。PPCP与电子束DeNOx和DeSOx的组合除了单独PPCP的独立作用外，不会产生非线性增强效应。
Pulse-induced plasma chemical process (PPCP) is a novel means of processing with a very large potential in various applications, including removal of NO, SO2, HCl, Hg vapor, and other gaseous pollutants from combustion gases, composition of new gaseous and solid substances, production of ultra-fine particulate materials, treatment of surfaces, etc. This is because PPCP can raise Linder normal pressure the electron temperature for production of active chemical species, such as OH radical, O, O3, O2, O2, N, N2, etc., without, raising ion temperature, which had been possible only by high frequency glow discharge under a low pressure condition. The authors developed a reliable nanosecond pulse high voltage generator allowing a continuous operation necessary to realize the PPCP as industrial devices. As one of its R&D program series the author investigated DeNOx and DeSOx of combustion gas by PPCP, and confirmed that DeNOx is possible by both positive and negative pulsings, and DeSOx only by positive pulsing. NO is oxidized by PPCP to NO, which is removed again by PPCP. The reaction speed by PPCP with positive pulsing is more than one order of magnitude higher than that by negative pulsing applicable to electrostatic precipitators. The reaction speed is greatly enhanced by raising the peak field intensity, which requires the use of very sharp pulse. The speed is also enhanced by raising pulse frequency, lowering gas temperature, and using sharp corona wires. The oxidation of NO and removal of NO2can proceed without O2and moisture, but it is greatly enhanced by them. The addition of NH3enhances also NO2-removal, possibly by its NO2-scavenging effect from gas phase, while it does not enhance NO-oxidation. The combination of PPCP with the Electron Beam DeNOx and DeSOx does not produce non-linear enhancing effect other than the independent any effect by PPCP alone.