Measurement of Plasma Properties of the Atmospheric Oxy-Combustion Flame by Using Double Probe Method
✍ Scribed by Y. Osaka; N. Kobayashi; N. Ohno; S. Takamura; Y. Tanaka; Y. Uesugi
- Publisher
- John Wiley and Sons
- Year
- 2008
- Tongue
- English
- Weight
- 195 KB
- Volume
- 48
- Category
- Article
- ISSN
- 0005-8025
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✦ Synopsis
Abstract
Oxy‐combustion generates a high‐temperature field of more than 3000 K and represents a nitrogen‐free process. In order to apply oxy‐combustion to next‐generation power plants and high‐temperature industrial technology this process has been enhanced by a new method, referred to as ‘plasma‐assisted combustion’. This method uses to control the oxy‐combustion flame with the radio‐frequency electromagnetic force acting on the hightemperature field of the oxy‐combustion flame. In order to establish the plasma‐assisted combustion technique it is necessary to assess the influence of the electromagnetic field on the flame parameters, i.e. to compare the main plasma properties (conductivity, electron density and temperature) of the oxy‐combustion flame with and without the assistance of the electromagnetic field. For that purpose we have developed a reciprocating double probe method to measure the plasma properties of the oxy‐combustion flame. In this paper we present (i) the experimental part (ii) the model that enables to estimate the electron temperature and density from the conductivity derived from the double probe measurements and (iii) measurements without the applied electromagnetic force. At the centre of the flame, the measured electrical conductivity is (1.3 ± 0.7) × 10^–4^ S/m which gives an electron temperature of 2800 ± 100 K and an electron density of (1.2 ± 0.5) × 10^15^ m^–3^. The electron temperature in oxy‐combustion is equivalent to the adiabatic flame temperature. The equilibrium adiabatic flame temperature in the oxy‐combustion of methane is estimated to be approximately 3100 K, which is in good agreement with the electron temperature measured in this study. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)