Heavy metal electrodes development for coal-fired MHD generator channels

T Okuo,Y Aoki,I Yoshizaki,N Kayukawa,S Yatsu,M Yagi,R Nishimura,S Oikawa,B Tuchida,H Kitagawa

doi:10.1109/plasma.1990.110586

Abstract

Summary form only given. An open-cycle magnetohydrodynamic (MHD) generator system with a heat input of 5 MWt was built for the purpose of high-efficiency demonstration experiments. It was decided to use electrodes and insulators for the generator channel that had high power generation and durability. Micro-arc electrode experiments were aimed at final structural improvement in order to make a generator channel with high electrical performance and long life. The following metallic electrode materials were prepared for the micro-arc experiments: W, WMo 50 , WRh 3 , WRh 25 , WTh 2 , CuW 70 , AgW 70 , W 96.5 -CuNiFe, Cu, Cr, Fe, Ag, Pt, Zr, Au, Ni, Alloy-30S, SUS 304, SUS 310S. Stellite, Inconel-X750, Hastelloy-X, MA8OOH, MA 6000, HA 188, Ni-Cr 20 -W 20 , Cantal, Ni-Cr 50 . Cr-Ni 30 -Fe 20 , Co-Cr 20 , K63-Al 2 O 3 6 , K63-Al 2 O 3 20 , and K63. Ceramic materials were also used in these experiments. The electrode materials using the W-system showed excellent results. None of the ceramic electrode materials, which were tested under the same conditions. showed satisfactory results. Research on the electrode material and structure with the aim of improving antiarcing capability under slagging conditions was conducted

Full Text