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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Temporal development and chemical efficiency of positive streamers in a large scale wire-plate reactor as a function of voltage waveform parameters
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Temporal development and chemical efficiency of positive streamers in a large scale wire-plate reactor as a function of voltage waveform parameters

机译：大型线板反应器中正流的时间发展和化学效率与电压波形参数的关系

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In this paper a large-scale pulsed corona system is described in which pulse parameters such as pulse rise-time, peak voltage, pulse width and energy per pulse can be varied. The chemical efficiency of the system is determined by measuring ozone production. The temporal and spatial development of the discharge streamers is recorded using an ICCD camera with a shortest exposure time of 5 ns. The camera can be triggered at any moment starting from the time the voltage pulse arrives on the reactor, with an accuracy of less than 1 ns. Measurements were performed on an industrial size wire-plate reactor. The influence of pulse parameters like pulse voltage, DC bias voltage, rise-time and pulse repetition rate on plasma generation was monitored. It was observed that for higher peak voltages, an increase could be seen in the primary streamer velocity, the growth of the primary streamer diameter, the light intensity and the number of streamers per unit length of corona wire. No significant separate influence of DC bias voltage level was observed as long as the total reactor voltage (pulse + DC bias) remained constant and the DC bias voltage remained below the DC corona onset. For those situations in which the plasma appearance changed (e.g. different streamer velocity, diameter, intensity), a change in ozone production was also observed. The best chemical yields were obtained for low voltage (55 kV), low energetic pulses (0.4 J/pulse): 60 g (kWh)(-1). For high voltage (86 kV), high energetic pulses (2.3 J/pulse) the yield decreased to approximately 45 g (kWh)(-1), still a high value for ozone production in ambient air (RH 42%). The pulse repetition rate has no influence on plasma generation and on chemical efficiency up to 400 pulses per second.
机译：在本文中，描述了一种大规模的脉冲电晕系统，其中可以改变脉冲参数，例如脉冲上升时间，峰值电压，脉冲宽度和每脉冲能量。该系统的化学效率通过测量臭氧的产生来确定。使用ICCD相机以最短5 ns的曝光时间记录放电拖缆的时间和空间变化。从电压脉冲到达电抗器开始的任何时刻都可以触发摄像机，其精度小于1 ns。在工业规模的线板反应器上进行测量。监测了诸如脉冲电压，直流偏置电压，上升时间和脉冲重复频率等脉冲参数对等离子体产生的影响。据观察，对于更高的峰值电压，可以看到初级拖缆速度，初级拖缆直径的增长，光强度和每根电晕丝长度的拖缆数量增加。只要总电抗器电压（脉冲+ DC偏置）保持恒定并且DC偏置电压保持在DC电晕开始以下，就不会观察到DC偏置电压水平的明显独立影响。对于等离子体外观改变的那些情况（例如不同的拖缆速度，直径，强度），还观察到臭氧产生的变化。对于低压（55 kV），低能脉冲（0.4 J /脉冲）：60 g（kWh）（-1），可获得最佳化学产率。对于高电压（86 kV），高能脉冲（2.3 J /脉冲），产量下降到大约45 g（kWh）（-1），对于环境空气中的臭氧产生仍然是一个很高的值（RH 42％）。脉冲重复频率不影响等离子体的产生以及每秒高达400个脉冲的化学效率。

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