GT26 gas turbine 370 MW with sequential combustion (EV/SEV)
The GT26 high-power gas turbine of 370 MW with sequential combustion in EV and SEV combustors. It is designed for high efficiency across the whole load range and flexible operation in competitive electricity markets. It is used mainly in combined cycle plants with frequent starts, deep turndown and parking during hours of low demand.
- Output (ISO, natural gas)
- 370 MW (including OTC)
- Simple cycle efficiency
- 41 %
- Exhaust gas flow
- 741 kg/s
- Exhaust temperature
- 635 °C
Price, availability and lead time on request. We help with analogue selection, customs clearance and delivery.
Description
The compressor is axial, 22-stage, with four stages of variable guide vanes. The fuel is burned twice. First it burns in the annular EV (EnVironmental) combustor with 24 burners, then the gas passes through a single-stage air-cooled high-pressure turbine. The second annular combustor, SEV (Sequential EnVironmental), also has 24 burners, followed by a four-stage air-cooled low-pressure turbine. The rotor is welded and the generator is driven from the cold end.
The data are given for ISO conditions, natural gas and direct cooling. The output of 370 MW includes the contribution of OTC, efficiency is 41 %, exhaust gas flow is 741 kg/s and exhaust temperature is 635 °C. The 1+1 combined cycle delivers 540 MW net at an efficiency of 61 % and a heat rate of 5900 kJ/kWh, and the 2+1 combined cycle 1083 MW at an efficiency of 61.2 %. Minimum combined cycle load is 15 % for 1+1 and 8 % for 2+1.
Sequential combustion keeps emissions low in a wide load window, down to 15 % of plant load. During hours of low demand the unit can be parked with all components switched on, without shutting it down. Such load headroom is convenient for maximum participation in dispatch on dynamic electricity markets. NOx emissions are up to 15 ppm dry on gas. At a high hydrogen content conventional combustors produce a lot of NOx and risk flashback, so output has to be reduced. In the GT26 the load reduction of the first stage is compensated by moving fuel to the second, so output is preserved and NOx stays low. Up to 45 % hydrogen in a mixture with natural gas is approved for operation, and the turbine keeps high efficiency at this share as well.
The operating mode is switched without stopping the machine. The power optimization mode gives more output, and the maintenance cost optimization mode gives up to 30 % more time between planned inspections. The hot gas path inspection interval is 32,000 hours. There are 110 GT26 turbines installed worldwide, 78 of them with the company's technologies, and the total operating time exceeds 9 million equivalent hours. Upgrade packages and service contracts, from one-off services to operation and maintenance contracts, are offered for the fleet.
Technical specifications
| Output (ISO, natural gas) | 370 MW (including OTC) |
|---|---|
| Simple cycle efficiency | 41 % |
| Exhaust gas flow | 741 kg/s |
| Exhaust temperature | 635 °C |
| Combined cycle 1+1 / 2+1 | 540 MW / 1083 MW net; efficiency 61 % / 61.2 % |
| Minimum combined cycle load | 15 % (1+1), 8 % (2+1) |
| NOx | up to 15 ppm (dry on gas) |
| Hydrogen | up to 45 % H2 in a mixture with natural gas |
| Hot gas path inspection interval | 32,000 h |
| Design | 22-stage compressor with 4 stages of variable guide vanes; annular EV and SEV combustors with 24 burners each; 1 HP turbine stage and 4 LP turbine stages |
Request a price and lead time
GT26 gas turbine 370 MW with sequential combustion (EV/SEV). We reply within one business day.
Or email sales@usk.ua or call 044 339-50-20.
Customs codes
| UKTZED (Ukraine) | 8411 82 80 00 |
|---|---|
| HS, 6 digits | 8411 82 |
| CN (EU) | 8411 82 80 |
| HTSUS (USA) | 8411 82 80 00 |
| China customs tariff | 8411 82 20 00 |
Codes are for reference: the final code is determined at declaration for the specific model.
Questions and answers
What output does the GT26 have in simple and combined cycle?
In simple cycle 370 MW at an efficiency of 41 %. The 1+1 combined cycle gives 540 MW net at 61 %, the 2+1 combined cycle 1083 MW at 61.2 %.
To what load can a unit with the GT26 be turned down?
Minimum combined cycle load is 15 % for 1+1 and 8 % for 2+1. Emissions within limits are maintained down to 15 % of plant load.
What is the hot gas path inspection interval of the GT26?
The interval is 32,000 hours. In the maintenance cost optimization mode the time between planned inspections grows by up to 30 %.
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