Mitsubishi Heavy Industries, Ltd. (MHI) has been developing tubular type Solid Oxide Fuel Cells (SOFC) since 1984. A lkW module of SOFC has been continuously operated for 3,000 hours with 2 scheduled thermal cycles at Electric Power Development Co., Inc. (EPDC) Wakamatsu Power Station in 1993. We have obtained of 34% (HHV as H2) module efficiency and deterioration rate of 2% per 1,000 hours in this field test.

As for next step, we have developed lOkW module ยก11 1995. The lOkW module has been operated for 5,000 hours continuously. This module docs not need heating support to maintain the operation temperature, and the module efficiency was 34% (HHV as H2).

On the other hand, we have started developing the technology of pressurized SOFC. In 1996, pressurized lkW module has been tested at MHI Nagasaki Shipyard & Machinery Works. We are now planning the development of pressurized lOkW module.

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