Abstract
We report on the effect of the cross-sectional shape of a magnet coil upon the reduction of the magnetohydrodymanic (MHD) channel length. We have optimized a cross-sectional shape of a magnet coil, including an MHD channel, for a 200 MWe coal-fired Faraday-type MHD generator. It is shown that the channel length can be shortened by more than 30% and the stored energy of the magnet coil can be reduced in comparison with the case of the crescent-shaped coil producing a uniform magnetic field without the decrease of enthalpy extraction. Also, for a stand-alone commercial MHD/steam combined plant, it is estimated by this coil shape optimization that the capital cost can be decreased by more than 8% and the cost of electricity can be reduced by about 3%.
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