Our highly efficient and rugged choices – for onshore and offshore mechanical drive and power generation
The PGT25 family of gas turbines draws its high efficiency and light weight from GE’s aeroderivative technologies proven in energy applications and aircraft engines, while its ruggedness is inherited from our heavy-duty gas turbine designs. Evolution from the proven GE Oil & Gas models has ensured high reliability and availability for the unique demands of this industry.
The PGT25 is a simple cycle, two shaft gas turbine consisting of an LM2500 aero derivative gas generator coupled with a rugged, industrial power turbine. It leverages the best GE Oil & Gas technology to respond to the demands of a gas turbine in the 23 MW range with high efficiency, reliability and availability, and low environmental impact. PGT25 can operate on a large range of both liquid and gas fuels. It is assembled on a rigid, lightweight base plate with extensive use of standard components, preassembled and tested in the shop to minimize on-site assembly time. Easy maintainability is one of the main features: the gas generator and low pressure turbine (cartridge) can both be easily and quickly removed and replaced, in order to minimize downtime.
The LM2500 has accumulated several million fired hours in both aircraft engine and industrial applications (marine, onshore and offshore gas transmission) as mechanical drive and generator drive. It has a 16-stage axial-flow compressor capable of reaching an 18:1 pressure ratio. Inlet guide vanes and adjustable stator vanes on the first six compressor stages provide for efficient operation over the entire operating range.
The power turbine components are based on GE’s extensive experience with heavy-duty gas turbines and axial/centrifugal compressors. Aerodynamic blading obtains very high efficiency at both design and reduced speeds. The 6,500 RPM design speed means the turbine can have two stages with a moderate aerodynamic load and a high expansion efficiency. The two expansion stages have a high-energy, three-dimensional design.
The PGT25+ gas turbine was developed for 30 MW ISO shaft power service with the highest thermal efficiency level (approx. 41%). Its LM2500+ gas generator (updated version of the LM2500 – various technology enhancements include a zero stage added to the axial compressor) is coupled with a 6,100 RPM, two-stage, high-speed power turbine. The LM2500+ is designed for ease of maintenance, high availability, reliability and efficiency. Specialized aeroderivative annular combustion chamber fuel nozzles make the PGT25+ ideal for a wide range of mechanical drive (gas pipeline, etc.), power generation, industrial cogeneration, and offshore platform uses in any environment. Engineering simplicity and advanced materials yield long times between overhauls and lower maintenance costs.
The gas generator is based on the LM2500+ design with enhancements to increase flow and temperature capabilities. The 6,100 RPM power turbine, from our proven PGT25+, is capable of direct coupling to the driven equipment for simplicity and improved efficiency and maintenance. The annular combustor is from the LM2500+ with modifications to enable higher firing temperature, reduce maintenance cycle time, and keep NOx at LM2500+ levels even at higher firing temperatures.
The enhanced PGT25+G4 package is a modular solution for improved integration of auxiliaries, reduced installation and commissioning time, and easy maintainability. Upgrade kits are also available for the installed base of PGT25+ units to increase output power by 10%.
This simple-cycle, two-shaft, high-performance gas turbine is derived from GE’s CF6-80C2, the aircraft industry standard for high-thrust engines. The unit delivers more than 44.8 MW at over 42.7% thermal efficiency. Direct drive provides 60,000 shaft HP from either end of the low pressure rotor for a wide range of electric power generation and mechanical drive applications in any environment. High thermal efficiency, low cost and installation flexibility make the LM6000 the ideal choice as a prime driver for utility peaking, mid-range, and base load operations, as well as for industrial cogeneration. It allows full speed-range capability from 50-105% of the rated speed of 3,600 RPM.
Continuing the tradition of the established record of GE’s LM2500, the LM6000 is an ideal source of drive-power for pipeline compression, offshore platforms, gas re-injection and LNG compression. The LM6000 was GE’s first aeroderivative gas turbine to employ the new Dry Low Emissions (DLE) premixed combustion system. DLE dual fuel, water or steam injection can also be used to achieve low NOx emissions.
This powerful machine represents the most extensive collaboration of design and manufacturing expertise in the history of GE – drawing proven design advantages from GE Aviation’s CF6-80C2/80E and GE Energy’s Frame 6FA+e gas turbine. This simple-cycle, three-shaft gas turbine uses intercooling technology to increase power and efficiency. At more than 100 MW or 134,000 shaft horsepower and 46% efficiency, the LMS100 provides the highest level of performance of any aeroderivative gas turbine.
Its aeroderivative core and free power turbine allow operating flexibility not seen in other gas turbines of its size. The free power turbine is ideal for mechanical drive applications due to the simple change-out of the first stage nozzle to optimize performance for 3,000 or 3,600 rpm drive shaft speeds and is capable to operate over a wide range of speeds. Its partial speed efficiency and ability to maintain power and efficiency at higher ambient temperatures is also better than other gas turbines in its class. The modular design and ability to change-out the supercore (core + intermediate pressure turbine assembly) engine in 24 hours, provides increased availability. The LMS100 utilizes a single design for 50Hz, 60Hz and mechanical drive with one common gas turbine, which improves fleet reliability.
PGT25 to Hi-Flow uprate
This retrofit increases flow capacity to achieve a significant increase in shaft output power (15% on ISO condition and at least 10% over a large ambient temperature range) and cycle efficiency. It can operate with steam injection for NOx abatement with a variety of fuels including natural gas, syngas, medium BTU gas, liquid fuel, dual fuel or Bi-fuel. DLE applications include gas only at 25 ppmvd and dual fuel running on liquid at 100 ppmvd.
PGT25+ to PGT25+G4 uprate
The PGT25+G4, with a rated ISO shaft power output of 34 MW and 41% efficiency (DLE version), is the largest machine in GE’s PGT25 series. The uprate increases flow capacity in the HP compressor, and HP and LP turbines; it achieves significant increase in shaft output power with limited modifications to the existing package. Additional cooling manifold and heat shield result in higher HSPT reliability. If planned concurrent with a major overhaul of the existing PGT25+ and with a buy back of the existing LM2500+, this uprate has a small incremental cost and a relatively short pay-back period.