M501D Series

Gas Turbines
  • Standalone Gas Turbine Output

    110 MW class

  • Combined Cycle Output

    170 MW class / 340 MW class / 510 MW class

  • Fuel Diversification

    Compatible with blast furnace gas (BFG)

Gas turbines for 60 Hz power generation matched with diversification of fuels

In 1984, a 1,090 MW heat recovery combined cycle power plant, which was powered by six 701D gas turbines, began commercial operation. This is the dawn of the current era of combined cycle power generation. The DA series incorporates the F-class technology into the D Series to improve overall performance.

Overall Design

The gas turbine unit is based on the basic structure adopted in the early 1970s that has accumulated a track record of at least 40 years. Its main features are as follows:

  • A compressor shaft end drive reduces the effect of thermal expansion on alignment
  • A rotor with simple single-shaft two-bearing support
  • A rotor structure has bolt-connected discs with the torque pins in the compressor section and CURVIC couplings in the turbine section to ensure stable torque transmission
  • An axial flow exhaust structure advantageous in combined cycle plant layouts
  • Horizontally split casings that facilitate field removal of the blades with the rotor in place


The DA Series incorporates a high efficiency compressor with a proven track record. Stationary vanes at backward stages are supported by blade rings to minimize the tip clearance of rotating blades.

Variable inlet guide vanes ensure operational stability at the start-up and enhanced performance at partial load in combined cycle operation.


Mitsubishi Power introduced the world' s first commercial dry low NOx combustors to the D Series gas turbines in 1984. A premixing low NOx combustor is composed of one pilot burner and eight main burners that surround it. The combustor has an air bypass mechanism that enables fuel-air ratio regulation in the combustion region.


In response to the increase in the turbine inlet temperature, stationary vanes at the first three stages and rotor blades at the first two stages are air-cooled. The rotating blades at the fourth stage is equipped with a Z-shaped shroud to enhance the vibration resistance strength of the blades.

Stationary vanes are supported by blade rings that are independent at individual stages to prevent the turbine casings from being affected by thermal expansion.



Compressor Number of Stages 19
Combustor Number of Cans 14
Cooling Method Air Cooled
Turbine Number of Stages 4
Rotor Number of Rotors 1
Output Shaft Cold End
Rated Speed 3,600 rpm
Gas Turbine Approx. L × W × H 11.4 × 4.5 × 4.8 m
Approx. Weight 190 ton

Simple Cycle Performance

Frequency 60 Hz
ISO Base Rating 113.95 MW
Efficiency 34.9 %LHV
LHV Heat Rate 10,320 kJ/kWh
9,780 Btu/kWh
Exhaust Flow 354 kg/s
780 lb/s
Exhaust Temperature 543 °C
Exhaust Emission NOx 25 ppm@15%O2
CO 30 ppm@15%O2
Turn Down Load 75 %
Ramp Rate 7 MW/min
Starting Time 30 minutes

Combined Cycle Performance

1 on 1 Plant Output 167.4 MW
Plant Efficiency 51.4 %LHV
2 on 1 Plant Output 336.2 MW
Plant Efficiency 51.6 %LHV
Starting Time 70 minutes

Performance Correction Curves

  • Effects of Compressor Inlet Temperature on Gas Turbine Performance (Typical)

  • Effects of Barometric Pressure on Gas Turbine Performance (Typical)


Typical Plant Layout - 1 on 1 configuration, single-shaft

  • Gas Turbines
  • Steam Turbines
  • Generators
  • Inlet Air Filter
  • Heat Recovery Steam Generator (HRSG)
  • Electrical / Control Package
  • Main Transformer
  • Condenser

Typical Plant Layout - 2 on 1 configuration

  • Gas Turbines
  • GT Generator
  • Steam Turbines
  • ST Generator
  • Inlet Air Filter
  • Heat Recovery Steam Generator (HRSG)
  • Electrical / Control Package
  • GT Main Transformer
  • ST Main Transformer
  • Condenser

Main Delivery Records


Funamachi Power Station, Nakayama Kyodo Hatsuden Co., Ltd. (Japan)
149 MW, 1 x M501DA 


Wakayama Kyodo Power Station Unit 1, Wakayama Kyoto Power Co., Inc. (Japan)
147 MW, 1 x M501DA

Recent Orders

Number of units x Series Year of start of operation Plant specifications
POSCO Power Corp. (Korea) 4 × M501DA 2010-2014 Blast furnace gas-fired combined cycle
Wakayama Kyodo Power Station Unit 1, Wakayama Kyoto Power Co., Inc. (Japan) 1 × M501DA 2014 Blast furnace gas-fired combined cycle
Shinko Kakogawa Power Station Units 1 and 2, Kobe Steel, Ltd. (Japan) 2 × M501DA 2011, 2015 Blast furnace gas-fired combined cycle
Oita Co-operative Thermal Power Station Unit 3, Oita Co-operative Thermal Power Co., Inc. (Japan) 1 × M501DA 2015 Blast furnace gas-fired combined cycle