2006 Fiscal Year Final Research Report Summary
Simultaneous decompositions of diesel particulate materials and nitric oxides using an atmospheric dielectric barrier discharge accompanied with a condensation/localization technique
| Project/Area Number |
17510070
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Environmental technology/Environmental materials
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| Research Institution | KYUSHU UNIVERCITY |
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Principal Investigator |
YAMAGATA Yukihiko Kyushu University, Interdisciplinary Graduate School of Engineering Sciences, Associate Professor, 大学院総合理工学研究院, 助教授 (70239862)
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| Project Period (FY) |
2005 – 2006
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| Keywords | dielectric barrier discharge / electrostatic precipitation / condensation / diesel exhaust gas / diesel particulate materials / nitric oxides / honeycomb structure / simultaneous decompositions |
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| Research Abstract |
A new decomposition technique for simultaneous decompositions of diesel particulate material (DPM) and nitric oxides (NOx) exhausted from a diesel engine has been investigated. It is based on a combination of a dielectric barrier discharge (DBD) with a condensation/localization technique. DPM and NOx are collected in an EP/DBD reactor using an electrostatic precipitation (EP) and honeycomb-shaped adsorbents, respectively. After sufficient collections, DBD is generated in the closed space including the reactor to condense the DPM and NOx, and decomposes these simultaneously and effectively.
In elementally experiments, cyclic adsorption/desorption of NOx on a honeycomb-shaped catalyst was achieved by the temperature control using the DBD. Also, it was demonstrated that NOx and carbon black imitating DPM, which act as the oxidant and reductant, respectively, were decomposed simultaneously and effectively by the DBD.
After these successful results, this technique was installed to an actual diesel engine. Negative corona discharge generated using a multi-tip electrode formed by narrow wires was found to be more effective to collect DPM by an EP than positive one. Up to 30 L/min of flow rate, 90 % or more of DPM in the exhaust gas were collected under the negative corona discharge generated at 5.0 kV. The reduction rate of almost 100 % was kept constant during a continuous 60 min operation. EP using negative corona discharge was realized to be suitable for DPM collection in a exhaust gas from an actual diesel engine. Also, collected DPM and NO molecules were decomposed simultaneously and effectively by a DBD operated at 60 Hz in the EP/DBD reactor. It was suggested that this proposed technique is very useful for the simultaneous decompositions of DPM and NOx in diesel exhaust gases.
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