10th International Aerosol Conference September 2 - September 7, 2018 America's Center Convention Complex St. Louis, Missouri, USA
Abstract View
Investigation of Power Absorption on Combustion of Carbon Black Using Microwave
SOMA TOGUCHI, Akinori Zukeran, Hiroyuki Toyozumi, Takashi Inui, Kanagawa Institute of Technology
Abstract Number: 162 Working Group: Combustion
Abstract Particulate substances containing a large amount of carbon black are emitted from ships and diesel generators. Therefore, an electrostatic precipitator (ESP) has been developed to remove them. In order to function at high efficiency, it is necessary to wash the electrode collected dust. In an ESP for a power plant, etc., this cleaning is achieved by mechanical impact rapping or water washing. However, there is a problem such as large-scale apparatus. In this study, the experiments were carried out to burn carbon black using microwave. The power absorption and the combustion rate were investigated.
The system consists of a microwave oscillator, a coaxial waveguide converter, 3 stub tuner, a waveguide and a short plunger. The dimension inside the waveguide was 54.6 mm in height by 109.2 mm in width. A short plunger was installed at the end of the waveguide, and standing wave with a wavelength of 147.9 mm was generated. The distribution of microwave in the waveguide was calculated using CST STUDIO SUITE. The carbon black (APPIE, JIS Z 8901) in porcelain crucible was located in the waveguide. The maximum point of the magnetic field is 74 mm from the short plunger, and that of the electric field is 37 mm and 111 mm. The microwave was irradiated for 5 minutes. The power absorption into carbon black was calculated from the difference between the input power and the reflecting power displayed on the oscillator. The combustion rate was calculated by equation (1).
η=(1-M/M0)×100% ⋅⋅⋅(1) where M0 is the mass of carbon black before irradiation, and M is mass after irradiation.
As a result of relationship between power absorption and location, the power absorption had large values at the distances of 37 mm and 111 mm, where were maximum point of electric field intensity. This result indicate that carbon black absorbed the energy of electric fields more than magnetic field. As a result of relationship between combustion rate and location, the combustion rates were between 11 % and 16 % at any location, especially the rates at the locations of 55.5 mm and 111 mm were greater than the other locations. Therefore, it was found that carbon black can be heated by both electric field and magnetic field, and burned at any location in this experimental condition.