M701D Series
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Standalone Gas Turbine Output
140 MW class
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Combined Cycle Output
210 MW class / 430 MW class / 650 MW class
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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
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.
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
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Effects of Compressor Inlet Temperature on Gas Turbine Performance (Typical)
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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
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 |