Radical density measurement at low-pressure discharge denitrification by appearance mass spectrometry

Citation
K. Ito et al., Radical density measurement at low-pressure discharge denitrification by appearance mass spectrometry, JPN J A P 1, 40(3A), 2001, pp. 1472-1476
Citations number
13
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Volume
40
Issue
3A
Year of publication
2001
Pages
1472 - 1476
Database
ISI
SICI code
0021-4922(200103)40:3A<1472:RDMALD>2.0.ZU;2-L
Abstract
In discharge denitrification, radical production by electron collision with combustion gas is a key process which determines the denitrification proce ss and its performance. In this study N, O, OH and H radical densities have been measured by appearance mass spectrometry in a low-pressure discharge field with parallel electrodes (2 cm gap) under simulated combustion gas fl ow. Also, electric field, electron number density and electron temperature at the radical sampling position have been measured by the Langmuir probe m ethod. Under constant discharge pressure the radical density (cm(-3)) was a bout 10(11)-10(12) cm(-3), and the density increased with increasing the di scharge current. Under constant discharge cur-rent, both the radical concen tration [-] and electron temperature increased with decreasing pressure. Th e radical concentration in the cathode fall region was greater than that fo r the outer region. Additionally, we measured the concentration change of N O mixed in the simulated combustion gas and observed a little change of the NO concentration.