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September, 2002
Mitsubishi completes the M701G2 Gas Turbine Shop Load Test

The M701G2 gas turbine melds the proven performance of the original M701G and an advanced compressor from MHI’s M501H gas turbine activity. The original M701G went into commercial operation in 1999, and the fleet has logged approximately 45,000 operating hours at 100% reliability. The M701G2 is presently the most advanced commercial offering from MHI for the 50 Hz power generation market, having a 1x1 combined cycle efficiency 58.7% with output of 489 MW, respectively. The primary objective of the M701G2 gas turbine was to marginally introduce H technology without upsetting the proven reliability track record of the original M701G gas turbine.
The M701G2 advanced axial flow compressor has 14 stages with a 21:1 pressure ratio, applying the latest 3-Dimensional compressor blade design methods. The airfoils were tested in the full scale M501H combined cycle verification that was completed during 2001 at the T-Point power plant. There are 4 stages in the turbine so as to maintain moderate aerodynamic loadings even at the increased firing temperature and pressure ratio, as in the case of all Mitsubishi large frame industrial gas turbines.
The combustion system consists of a 20 can-annular combustor with almost the same diameter and length as the M501G, which has 16 such combustors. The low NOx hybrid combustor design is an improvement on the current highly successful design that has been in commercial operation on the M501F/M701F fleet for natural gas and liquid fuel firing. The transition piece is cooled by steam through a double-wall structure for more uniform cooling effectiveness.




The M701G2 gas turbine development and commercial introduction approach is consistent with other previous advanced technology introductions from MHI over the past four decades.
The M701G2 shop load test was successfully completed in May of this year at MHI’s Takasago factory. The test was up to approximately 40% load due to the factory load absorbing facility limitation. More than 1,800 special measurement points were monitored for design, reliability and performance verification of the compressor, combustor, and turbine.
The measurements confirmed that all of the critical parameters such as shaft vibration, bearing oil temperature, thrust, compressor starting characteristics, tip clearance, turbine blade metal temperature, etc., met design margins. The data were also important for confirming that the overall performance capability and rated performance can be achieved satisfactorily.
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