Abstract
Mitsubishi Heavy Industries, Ltd. (MHI) has established, through wide-scale development programs, the technologies for design and materials of steam turbines with steam temperature 593℃, and has applied the steam conditions of 24.2MPa/538℃/593℃ to the large-capacity 700MW turbine, Hekinan No.3 Unit for Chubu Electric Power Co., Inc. According to further development of high-temperature design, MHI has successfully developed the 1000MW turbine, Matsuura No.2 Unit for Electric Power Development Co., Ltd. (EPDC) with a steam condition of 600℃ class main steam and reheating steam temperature for the first time in the world. Then 1000MW class high temperature units successfully entered commercial operation at Chugoku Electric Misumi No.1 (24.6MPa/600℃/600℃) and EPDC Tachibana-wan No.2 (25.1MPa/600℃/610℃). The Tachibana-wan No.2 Unit is a 1050MW cross-compound plant with the highest condition of 600℃/610℃, and started commercial operation in December 2000. This paper describes the features of design and operating experience of this unit after about two year's commercial operation.
