SIEMENS SGT-2000E series gas turbine

SIEMENS SGT-2000E series gas turbine

Overview of Core Products

1. Product positioning and core values

Positioning: Mature heavy-duty gas turbine, designed for efficient and flexible power production, suitable for multi scenario energy needs, and can be used as the core equipment of single cycle or combined cycle power plants.

Core values: Low unit kilowatt investment cost, wide fuel adaptability, flexible operation, low maintenance cost, long service life, fast investment return, and fleet reliability exceeding 99%.

Market performance: As of July 2011, over 400 units have been delivered globally with a total operating time of approximately 9 million hours. Among them, the SGT5-2000E standalone model has accumulated over 6.4 million hours of operation, verifying its stability.

2. Key performance parameters (ISO standard conditions, natural gas fuel, gross value)

Parameter SGT5-2000E (50Hz) SGT6-2000E (60Hz)

Output power 166MW 112MW

Efficiency 34.7% 33.9%

Heat consumption 10375kJ/kWh (9834Btu/kWh) 10619kJ/kWh (10066Btu/kWh)

Exhaust temperature 541 ℃ (1005.8 ℉) 540 ℃ (1004 ℉)

Exhaust mass flow rate 525kg/s (1157lb/s) 365kg/s (804lb/s)

Pressure ratio 12 12.1

Dimensions (length x width x height) 10 x 12 x 7.5m (including combustion chamber) 8.3 x 10 x 6.25m (including combustion chamber)

Weight 234t (including combustion chamber) 163t (including combustion chamber)

3. Combined cycle performance (multi axis configuration)

1 × 1 configuration: SGT5-2000E with a net output of 250MW and an efficiency of 52.4%; SGT6-2000E has a net output of 171MW and an efficiency of 51.3%.

2 × 1 configuration: SGT5-2000E with a net output of 505MW and an efficiency of 52.9%; SGT6-2000E has a net output of 345MW and an efficiency of 52.0%.

Core design features

1. Infrastructure design

Core configuration: Single shaft and single cylinder design, dual rotor bearings, cold end driven generator, disc rotor (with Hess serrated connection and center pull rod bolt).

Core components:

Compressor: SGT5-2000E has 16 stages, SGT6-2000E has 17 stages; Variable pitch inlet guide vanes, supporting operation at loads as low as 50% and stable exhaust temperature.

Turbine: A 4-stage structure, with the first 3 stages of stationary blades and the first 2 stages of moving blades cooled by convective air. The first 3 stages of the turbine are coated with special materials and do not have film cooling (suitable for dusty fuels).

Combustion chamber: Double silo structure with ceramic insulation cover, 8 burners per chamber for SGT5-2000E and 6 burners per chamber for SGT6-2000E, supporting dry low NOx technology.

2. Core advantageous features

Fuel flexibility: Suitable for both gaseous (natural gas, low calorific value gas, synthetic gas) and liquid fuels (fuel oil, heavy oil, crude oil, naphtha, kerosene), including specialized burners for unconventional fuels.

Operational flexibility: Fast start-up (accelerating to full load within 4 minutes), low emissions under partial load, support for flexible grid regulation, adaptable to special power plant scenarios such as IGCC.

Convenience of maintenance: Manholes are installed inside the combustion chamber for easy inspection of hot aisle components; The dynamic/static blades can be replaced separately (without disassembling the rotor); Ash fuel is easy to clean and inspect during operation.

Environmental performance: Adopting a premixed burner, NOx and CO ₂ emissions are minimized, and low emission levels can still be maintained under partial load.

Core design details and technological advantages

1. Overall structural design

Core configuration: Single shaft and single cylinder design, supported by dual rotor bearings, with the cold end (compressor end) driving the generator to avoid high temperature losses and maintenance risks caused by the hot end driving.

Rotor design: The disc rotor structure is fixed to the central pull rod bolt through Hirsh serrations, ensuring that the rotor components self align during steady-state and transient operation, thereby improving operational stability; Internally designed air circulation channels to minimize thermal stress and support quick start stop.

Modular design: The device structure has a high degree of modularity, making it easy to transport, install, and maintain. It can be flexibly combined and configured according to project requirements.

2. Technical analysis of key components

(1) Compressor

Level configuration: SGT5-2000E has 16 levels, SGT6-2000E has 17 levels; Provide a modified version of a 17 stage compressor for non air integrated synthesis gas/IGCC applications.

Core features: Variable pitch inlet guide vanes (VIGV), capable of maintaining a constant exhaust temperature at loads as low as 50%, and adapting to flexible load regulation requirements; The dynamic/static blades adopt a free standing design, optimized by frequency modulation, and can operate continuously at full load within a wide frequency offset range.

(2) Turbine

Structural parameters: 4-stage turbine design, with convective air cooling technology used for the first 3 stages of stationary blades and the first 2 stages of moving blades, suitable for high-temperature working environments; The first three stages of turbine blades are covered with special coatings to enhance their high temperature resistance and corrosion resistance.