Influence of H2O on a Simulation of the Discharge Induced Chemical Reactions in Exhaust Gas Using a Micro Discharge Model

Shoyama, Taiji; Yoshioka, Yoshio

doi:10.1541/ieejfms.125.402

Cited by 6 publications

(11 citation statements)

References 4 publications

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“…The authors have already studied an important issue in the technology for removing NOx from diesel engines, namely, how to improve the energy efficiency (the amount of NOx removal per unit energy consumption). One of the studies was a computer calculation of the NO removal process, whose results showed that an FD consisting of many FDs of lower energy is desirable for improvement of energy efficiency [3,4]. It was also found that when acrylic resin plates are used as a barrier material, a nearly uniform discharge appeared between the electrodes.…”

Section: Introductionmentioning

confidence: 99%

Generation of uniform discharge by dielectric barrier discharge device in atmospheric‐pressure air

Osawa

Yoshioka

Hanaoka

et al. 2012

Electrical Engineering Japan

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We found that the generation of a uniform discharge in atmospheric-pressure air was possible in the frequency range from 32 Hz to 1.1 kHz using alumina as a barrier material of the DBD (Dielectric Barrier Discharge) device. We also found that there is a voltage domain for the generation of the uniform discharge. The domain becomes wider with the increase of the frequency. If the applied voltage is slightly higher than the upper limit voltage of stable generation of a uniform discharge, the uniform discharge changes to a nonuniform FD (Filamentary Discharge). In order to clarify the mechanism of generation of the uniform discharge, we investigated how the barrier materials change the discharge mode by both photographic observation and analysis of electric circuit phenomena. We also carried out experiments with a DBD device, using a combination barrier of soda glass and alumina. In this case, the uniform discharge and the FD appeared alternately in every half cycle. As a result, it was found that a uniform discharge was generated when the alumina barrier was used and it acted as a cathode. From analysis of the gap voltage and the current, it was also found that the uniform discharge was an APTD (Atmospheric Pressure Townsend Discharge) characterized by electron avalanche. This paper presents the experimental results and discussions.

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Section: Introductionmentioning

confidence: 99%

Generation of uniform discharge by dielectric barrier discharge device in atmospheric‐pressure air

Osawa

Yoshioka

Hanaoka

et al. 2012

Electrical Engineering Japan

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“…In plasma-enhanced HC-SCR, the plasma is expected to be an efficient oxidizer of NO into NO 2 . From such viewpoint, the unwanted reaction (11) has to be suppressed. Figure 7 shows temporal variations of NO x and O 3 concentrations in the reactor.…”

Section: Plasma-induced Chemical Reaction 321 Characteristics Of No O...mentioning

confidence: 99%

“…Many studies have been carried out to investigate the chemical processes for gas cleaning by the plasma-enhanced chemical reaction in DBD. 10,11) However, these studies do not consider the filamentary microdischarge, and the simulated results were not sufficiently compared with the experimental ones under various discharge conditions. Therefore, it is difficult for us to judge their validities quantitatively.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of NO Oxidation in Dielectric Barrier Discharge with Microdischarge Formation

Tochikubo¹,

Uchida²,

Yasui

et al. 2009

jjap

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In this work, we developed a simulation model for plasma-enhanced chemical reaction in dielectric barrier discharge (DBD) in consideration of filamentary microdischarge formation. The first stage is the calculation of single filamentary microdischarge developed in DBD with parallel plate geometry using the fluid model. The second stage is the calculation of chemical processes with a set of rate equations using the radical production yield obtained in the filamentary microdischarge calculation. This model was applied to the NO oxidation process, which is often important in NO x removal using gas discharges, in atmospheric pressure N 2 /O 2 /NO mixtures under various discharge conditions. The calculated NO oxidation property has a quantitatively good agreement with the experimental one under wide discharge conditions. Therefore, the method used in this work is valid for the prediction of chemical processes in DBD. We also discuss the effect of gas temperature and gas residence time on NO oxidation.

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“…Namely, the influences of micro-discharge parameters such as discharge current density, radius of discharge channel, and pulse current duration have not as yet been analyzed. This paper deals with a simple NO removal system without using any additives or catalysis [9]. We focus on a single micro-discharge in barrier discharge.…”

Section: Introductionmentioning

confidence: 99%

“…The electron density n e in a micro-discharge is given by Eq. (9). In the simulation, the electrons are assumed to be accelerated by the reduced electrical field strength of 100 Td, and the electron dissipation rate κ was assumed to be 0.55, as described in Ref.…”

Section: Introductionmentioning

confidence: 99%

Theoretical study of methods for improving the energy efficiency of NOx removal from diesel exhaust gases by silent discharge

Shoyama

Yoshioka

2007

Electrical Engineering Japan

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SUMMARYTo improve the NO removal performance in silent discharge process, we investigated the influence of physical parameters such as current density, channel radius, and pulse duration of one micro-discharge under a constant reduced electric field strength. The influence of micro-discharge occurrence locations was also discussed. In order to analyze the NO removal process, we assumed that the pulse micro-discharges occur repeatedly at the same location in static gas and that the chemical reactions induced by microdischarge form many radicals, which react with pollutants and by-products. The conclusions we obtained are that lower current density, smaller discharge radius, and shorter discharge duration improve NO removal efficiency. These results also mean that the lower discharge energy of one micro-discharge and the larger number of parallel microdischarges increase the NO removal performance. Therefore, making the area of one micro-discharge small is a desirable way to improve the NO removal performance. Thus, we think that the glow-like discharge might be more effective than the streamer-like discharge mode. Next, using the two-dimensional model, which considered the influence of gas flow, we found that the repeated micro-discharges at

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Influence of H2O on a Simulation of the Discharge Induced Chemical Reactions in Exhaust Gas Using a Micro Discharge Model

Cited by 6 publications

References 4 publications

Generation of uniform discharge by dielectric barrier discharge device in atmospheric‐pressure air

Generation of uniform discharge by dielectric barrier discharge device in atmospheric‐pressure air

Numerical Simulation of NO Oxidation in Dielectric Barrier Discharge with Microdischarge Formation

Theoretical study of methods for improving the energy efficiency of NOx removal from diesel exhaust gases by silent discharge

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