Influence of Polarity and Rise Time of Pulse Voltage Waveforms on Diesel Particulate Matter Removal Using an Uneven Dielectric Barrier Discharge Reactor

Abstract

The influence of polarity and rise time of the pulse voltage on the removal of particulate matter (PM) emitted from a diesel engine was investigated using a dielectric barrier discharge reactor. Four kinds of pulse voltage waveforms (positive, negative, positive-negative and negative-positive) were used. It was found that the energy efficiency for PM removal is just a function of energy injection and that there are no obvious influences on PM removal and energy efficiency within the voltage waveforms except the negative pulse voltage of a peak voltage below 8 kV. A comparison of PM removals using various kinds of pulse voltage waveforms and different types of plasma reactors is given.

Influence of non-thermal plasma after-treatment technology on diesel engine particulate matter composition and NOx concentration

“…Furthermore, emission reduction in diesel engines at low temperature is important in some special applications of diesel engines such as mining industries where exhaust cooling occurs for safety reasons. In comparison with the numerous publications on NO x treatment by plasma (Lebouvier et al 2011;Vinh et al 2012;Arai et al 2004;Jolibois et al 2012;Mohapatro and Rajanikanth 2011;Chae 2003;Yoshida et al 2009), a limited amount of research has investigated particulate matter (Ye et al 2005;Thomas et al 2000;Babaie et al 2013) and most of it has emphasised PM mass reduction only (Yao et al 2006;Fushimi et al 2008). In this paper, the effect of plasma technique on particulate matter constitutes (soot, SOF and sulphates) and NO, NO 2 and N 2 O emission concentrations have been studied.…”

Application of combined plasma-catalytic method for carbon particulate matter (PM) removal

“…Furthermore, during the experiment, only CO 2 can be detected with no other products such as CO detected by chromatography in the effluence, indicating the main component of carbon PM is pure graphite structure. 24 It may be due to the fact that active species generated in the combined plasma-catalytic process are contributing to accelerate the reaction of carbon converted into CO and CO 2 .…”

“…Furthermore, nonthermal plasma could activate molecules including PM, hydrocarbons, and NO x at room temperature. 23,24 Thus, extensive application of NTP has been reported in chemical synthesis, 25 removal of environmental pollutants such as volatile organic compounds (VOCs), 26,27 and fabrication of materials. 28 Consequently, moderate reacting conditions with low temperature and high removal efficiency are the advantages of decomposition of carbon PM in NTP.…”

Meachanism and method of DPF regeneration by oxygen radical generated by NTP technology

“…NTP technology can effectively lower the DPF regeneration temperature, and there is no catalyst poisoning phenomenon which is faced by traditional regeneration. NTP technology has been one of the hot spot of DPF regeneration methods in recent years (Fushimi et al, 2008;Okubo et al, 2009). This article has carried on an experimental research of DPF regeneration by using a self-designed NTP injection system with oxygen as gas source.…”