MHI introduces 50 Hz F class gas turbine upgrade

Mitsubishi Heavy Industries, Ltd. (MHI) has introduced the M701F5 gas turbine with a newly upgraded and more flexible design.

The M701F5 will operate at a turbine inlet temperature (TIT) of 1500°C, a level previously obtainable only with G Class and higher specification. The M701F5 features high efficiency and low NOx emissions while maintaining the exceptionally high reliability exhibited by the preceding MHI F fleet. The company is currently engaged in manufacturing activities in the runup to the new turbine's commercial production.

The M701F5 design is based on the preceding M701F4. The compressor section retains the M701F4's airflow. The mid and rear stage profiles have been modified from NACA1 to CDA2. The combustion system is based on the verified GAC engine, and the turbine section incorporates state-of-the-art gas turbine technologies developed for the J Class, including advanced cooling technology and advanced thermal barrier coatings.

The M701F5 gas turbine achieves a rated simple cycle power output of near 350 MW (ISO basis) and 520 MW in combined-cycle (GTCC) power generation. In GTCC applications, high-temperature exhaust gas from the gas turbine is used to generate power by a steam turbine. MHI is aiming to achieve GTCC thermal efficiency in excess of 61 per cent.

The company is currently conducting stringent verification tests on the M501J gas turbine and its core technologies. The results of the J-series validation have provided invaluable data for the M701F5's components, which are derived from the J design.

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