Advanced heavy-duty developments
for the 50 Hz market
Mitsubishi Hitachi Power Systems has recently achieved two important milestones in the development of its heavy-duty gas turbines for the 50 Hz market. The first two M701J units are now in commercial operation, while a new upgraded M701F has been introduced and commissioned.
Mitsubishi Hitachi Power Systems (MHPS) has accumulated significant
operating experience with its J technology gas turbines since the first 60 Hz
M501J began commercial operation in June 2011. A total of 45 units have been
sold and more than 300 000 hours have been amassed on 21 operating machines.
Leveraging the experience from 19 M501J turbines, MHPS has now manufactured
two M701J machines for the 50 Hz market for a combined cycle plant
in Japan. The first unit started commercial operation by the end of 2015 and the
second one in June 2016.
At the same time, in a move to satisfy the continuing demand for F-technology in the 50 Hz market, MHPS has also introduced its latest 50 Hz F-technology upgrade. The M701F5, featuring 1500°C-class turbine inlet temperature (TIT), has also started commercial operation at another combined cycle plant in Japan.
MHPS’s 50 Hz portfolio includes several high efficiency large frame gas turbines.
Table 1 shows their combined cycle efficiency – from the F-Class introduced in
the 1990s, to the J-series with combined cycle efficiency in excess of 61.7% efficiency (LHV).
The M501J and the M701J are MHPS’s largest and most advanced gas
turbines. The J design is based on the successful application of steam-cooling
developed and tested in the G series. The higher performance was achieved by incorporating state-of-the-art technologies developed for the Japanese National
Project. These include advanced turbine cooling, improved turbine aerodynamics
and advanced thermal barrier coating (TBC).
The first 60 Hz J-technology engine has been in operation since June 2011
and has accumulated more than 25,000 AOH and over 200 starts as of May
Of the first 19 turbines in commercial operation, six units in single-shaft combined
cycle configuration are in operation in Japan, with the remaining units in
Scaled design. The M701J was designed by direct scaling of the M501J
The design of the M501J gas turbine is based on the proven F- and G-series. Key features are:
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