M701J Series

Gas Turbines

Standalone Gas Turbine Output

440-570 MW class
Combined Cycle Output

650-840 MW class
Combined Cycle Efficiency

More than 64%
High Reliability Verified

Cumulative total number of hours of operation as commercial unit:More than 1,000,000 hours

Cutting-edge high-capacity gas turbines for 50 Hz power generation
incorporating state-of-the-art technologies

The J Series gas turbines are an integration of the proven G Series and elemental technologies for temperature increase as a result of the Japanese national project for development of 1,700°C class gas turbines. They operate at a turbine inlet temperature of 1,600°C.
Developed as a model with a similar design, the M701J Series for 50 Hz power generation began commercial operation at the beginning of 2016. The M701JAC Series gas turbines adopt air cooling for combustors instead of steam cooling. With performance equivalent to the M701J Series gas turbines, they produce a high level of operability including a shorter start-up time.

Features
Specifications
Layout
Delivery Records

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

Advanced three-dimensional design techniques are used to improve performance while reducing the shockwave loss in the initial stages and frictional loss in the intermediate and final stages. The inlet guide vanes and variable stationary vanes at the first three stages are controlled to ensure stable operation at the start-up and enhanced performance at partial load in combined cycle operation.

Combustor

The J Series combustor is based on the steam cooling system proven with the G Series. An improved fuel nozzle is used to help produce a more homogeneous mixture of fuel and air. Despite the rise in turbine inlet temperature, the combustor attains NOx emission concentration equivalent to that of the G Series.

Incorporating air-cooled combustors, the JAC series adds operational flexibility by eliminating any need for steam cooling from the bottoming cycle.

Turbine

The turbine inlet temperature is 100°C higher than that of the G Series. However, the application of high performance cooling technologies developed in a Japanese national project for the development of 1,700°C class gas turbines and advanced thermal barrier coating (TBC) helps to maintain the metal temperature of the turbine blades at the level of conventional gas turbines.

Configuration

		M701J	M701JAC
Compressor	Number of Stages	15	15
Combustor	Number of Cans	22	22
Combustor	Cooling Method	Steam Cooled	Air Cooled
Turbine	Number of Stages	4	4
Rotor	Number of Rotors	1	1
Output Shaft		Cold End	Cold End
Rated Speed		3,000 rpm	3,000 rpm
Gas Turbine	Approx. L × W × H	16.7 × 6.5 × 6.9 m	16.7 × 6.5 × 6.9 m
Gas Turbine	Approx. Weight	550 ton	550 ton

Simple Cycle Performance

		M701J	M701JAC（2015）	M701JAC（2018）
Frequency		50 Hz	50 Hz	50 Hz
ISO Base Rating		478 MW	574 MW	448 MW
Efficiency		42.3 %LHV	43.4 %LHV	44.0 %LHV
LHV Heat Rate		8,511 kJ/kWh	8,295 kJ/kWh	8,182 kJ/kWh
LHV Heat Rate		8,067 Btu/kWh	7,826 Btu/kWh	7,755 Btu/kWh
Exhaust Flow		896 kg/s	1,024 kg/s	765 kg/s
Exhaust Flow		1,977 lb/s	2,181 lb/s	1,687 lb/s
Exhaust Temperature		630 °C	646 °C	663 °C
Exhaust Temperature		1,166 °F	1,201 °F	1,226 °F
Exhaust Emission	NOx	25 ppm@15%O₂	25 ppm@15%O₂	25 ppm@15%O₂
Exhaust Emission	CO	9 ppm@15%O₂	9 ppm@15%O₂	9 ppm@15%O₂
Turn Down Load		50 %	50 %	50 %
Ramp Rate		58 MW/min	66 MW/min	53 MW/min
Starting Time		30 minutes	30 minutes	30 minutes

Combined Cycle Performance

		M701J	M701JAC（2015）	M701JAC（2018）
1 on 1	Plant Output	701 MW	840 MW	650 MW
1 on 1	Plant Efficiency	62.3 %LHV	＞64.0 %LHV	＞64.0 %LHV
2 on 1	Plant Output	‐	‐	‐
2 on 1	Plant Efficiency	‐	‐	‐
Starting Time		‐	‐	‐