New industrial turbines entering the market
There has been a flurry of announcements introducing new industrial turbines. ABB, GEC Alsthom, AlliedSignal, Solar Turbines Inc. and Ishikawajima-Harima Heavy Industries Company Ltd. have all made recent announcements of new industrial turbines that are either in latter stages of development or now available.
ABB is launching its GTX100, a compact, 43 MW industrial gas turbine designed for low-cost power production, high efficiency and low emissions. Although simple-cycle efficiency reaches 37 percent, the GTX100 is optimized for combined-cycle operation, where output reaches 62 MW and efficiency rises to 54 percent. It is also capable of cogenerating heat and power.
The GTX100 is aimed at independent power producers, small utilities and process industries. To meet the requirements of this market segment for low life-cycle costs, high reliability and availability, plant compactness and short delivery times, the design concept is based on simplicity and proven technologies. The turbine has a single shaft supported by two hydrodynamic bearings. It has a modular design for short installation time at the site. A gas turbine replacement can be carried out in a day and burners can be removed without dismantling the machine. The vertically split compressor casing allows easy service access.
The compressor is a scaled-down version of the GT24/26 compressor and uses welded-rotor technology. It uses ABB`s annular configuration with dual fuel, dry, low-emission capability and an even temperature profile.
The GTX100 is the first ABB gas turbine to use its new advanced EV (AEV) burner technology. This a development of the dry, low-NOx EV burner, which has been in use for several years. NOx and CO emissions are 15 ppm for gas and 25 ppm for liquid fuels. For cogeneration and combined-cycle operation, the generator is driven from the cold end, and the exhaust gases leave the turbine axially.
GEC Alsthom has announced a new gas turbine called the Cyclone, manufactured by subsidiary European Gas Turbine. The Cyclone, rated at 13.4 MW or 18,000 hp, is to complement the Typhoon, Tornado and Tempest gas turbines. The Cyclone is a two-shaft machine for 50 Hz or 60 Hz power generation or mechanical drive and has a thermal efficiency in excess of 35 percent. It will burn gaseous or liquid fuel, has a dry low-emissions combustion system and will be available with steam injection.
The turbine is designed for utility, oil and gas, and industrial power generation and mechanical drive applications, and is well suited to cogeneration. The Cyclone has a zero stage version of the Tempest compressor resulting in an 11-stage design with transonic flow conditions.
The emissions system guarantees 25ppmv and 50 ppmv NOx on natural gas and distillate fuel respectively. The turbine has six reverse-flow tubular combustion chambers positioned around the high-pressure casing and operates on natural gas or distillate fuel with automatic changeover between primary and secondary fuel at any load.
The unit can be maintained on site to minimize downtime. The core engine can be replaced with a factory exchange unit if needed. Maintenance features include vertically and horizontally split intake casing for easy access to the air intake; multiple borescope inspection port for thorough condition monitoring without gas turbine disassembly; horizontally split compressor casing for easy inspection of the compressor rotor and stator blades; and combustion chambers, flame tubes and ignitors which are accessible for inspection without removal of main engine casing.
AlliedSignal recently announced the development of a new 10 MW ASE120 aeroderivative gas turbine for power generation and compressor drive applications. The engine, expected to enter service in 1998, is a derivative of the AlliedSignal TFE1042 afterburning turbofan engine. The ASE120 will generate 12,900 shp, 7,900 rpm, with thermal efficiency greater than 35 percent.
The turbine uses a dry low-emissions (DLE) system developed in conjunction with Optima Radial Turbine B.V., The Netherlands. The DLE system will have dual fuel capabilities, and will be able to achieve less than 25 ppm NOx and 10 ppm CO on natural gas. Emissions on liquid fuel will be under 25 ppm NOx and unburned hydrocarbons and less than 50 ppm CO. Continuous DLE development will promise NOx levels less than 10 ppm on natural gas.
Solar Turbines has announced the development of the 13.2 MW Titan 130 gas turbine, a high-efficiency, simple-cycle, two-shaft machine for industrial applications. The Titan 130 gas turbine is designed to deliver a thermal efficiency topping 34 percent. It will have Solar`s pollution-prevention SoLoNOx combustion system. The prime mover is based on technologies and design scale-ups of features proven in its 7.2 MW Taurus 70 and 11.2 MW Mars 100 gas turbines.
Key design features include:
– a 14-stage compressor with variable inlet guide vanes and stators and a vertically split compressor case;
– single annular-type combustor, with 14 injectors and plans for dual fuel and distillate fuel systems to be designed and introduced later in the development cycle;
– two-stage gas generator with a design speed of 11,215 rpm;
– two-stage free power turbine designed for an optimum speed of 790 rpm and a maximum speed of 8,855 rpm;
– five tilt-pad radial bearings with proximity probes to monitor vibration and two tilt-pad thrust bearing with RTD probes.
Ishikawajima-Harima Heavy Industries Company Ltd. is introducing a new 2 MW class high-efficiency gas turbine, called the IM270, for cogeneration plants. The design features simple-cycle and a single-shaft gas turbine engine. It has a two-stage centrifugal compressor and three-stage axial turbine connected through Curvic coupling, air-cooled first-stage turbine vanes and dry low NOx single can combustor.
Emissions are controlled through dry low NOx combustors which were developed for liquid and gaseous fuel. It has a fuel staging system adopted for improving emissions with stable combustion.