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Gas TurbinesM701D Series

  • Standalone Gas Turbine Output

    140 MW class

  • Combined Cycle Output

    210 MW class / 430 MW class / 650 MW class

  • Fuel Diversification

    Compatible with blast furnace gas (BFG)

Gas turbines for 50Hz 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

Compressor

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.

Combustor

MHPS 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.

Turbine

In response to the increase in the turbine inlet temperature, stationary vanes at the first three stages and rotating blade at the first two stages are air-cooled. The rotating blade 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.

Configuration

  M701DA
Compressor Number of Stages 19
Combustor Number of Cans 18
Cooling Method Air Cooled
Turbine Number of Stages 4
Rotor Number of Rotors 1
Output Shaft Cold End
Rated Speed 3,000 rpm
Gas Turbine Approx. L × W × H 11.9 × 5.0 × 5.3 m
Approx. Weight 240 ton

Simple Cycle Performance

  M701DA
Frequency 50 Hz
ISO Base Rating 144.09 MW
Efficiency 34.8 %LHV
LHV Heat Rate 10,350 kJ/kWh
9,810 Btu/kWh
Exhaust Flow 453 kg/s
999 lb/s
Exhaust Temperature 542 °C
1,008 °F
Exhaust Emission NOx 25 ppm@15%O2
CO 30 ppm@15%O2
Turn Down Load 75 %
Ramp Rate 9 MW/min
Starting Time 30 minutes

Combined Cycle Performance

  M701DA
1 on 1 Plant Output 212.5 MW
Plant Efficiency 51.4 %LHV
2 on 1 Plant Output 426.6 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

  1. Gas Turbines
  2. Steam Turbines
  3. Generators
  4. Inlet Air Filter
  5. Heat Recovery Steam Generator (HRSG)
  6. Electrical / Control Package
  7. Main Transformer
  8. Condenser

Typical Plant Layout - 2 on 1 configuration

  1. Gas Turbines
  2. GT Generator
  3. Steam Turbines
  4. ST Generator
  5. Inlet Air Filter
  6. Heat Recovery Steam Generator (HRSG)
  7. Electrical / Control Package
  8. GT Main Transformer
  9. ST Main Transformer
  10. Condenser

Main Delivery Records

Higashi-Niigata Thermal Power Station Unit 3, Tohoku Electric Power Co., Inc. (Japan)
1,090 MW, 6 x MW-701D
East Japan Works, JFE Steel Corporation (Japan)
149 MW, 1 x MW-701D
Nakoso Power Station Unit 10, Joban Joint Power Co., Ltd.
250 MW, 1 x M701DA

Recent Orders

  Number of units x Series Year of start of operation Plant specifications
Zerger Gas-Fired Power Plant, Turkmenenergo (Turkmenistan) 3 × M701DA 2019 Simple cycle
Shougang Jingtang United Iron & Steel Co., Ltd. (China) 1 × M701DA 2018 Blast furnace gas-fired combined cycle

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