Gas and steam turbines are among the most vital – and most demanding – equipment in power generation.
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Turbine bearings are often subjected to high loads, high speeds and high temperatures, especially as capacity and efficiency demands increase.
To ensure optimum dynamic characteristics in specific operating conditions, Waukesha Bearings applies a variety of specialized design features to bearing solutions.
With our in-depth understanding of system rotordynamics, Waukesha Bearings offers proven solutions to improve stability and control vibrations. Chief among those solutions, our ISFD® technology provides highly engineered damping and stiffness to maximize energy dissipation at the bearing locations.
ISFD Technology Rotordynamic Analysis
For a power generation customer in Scandinavia, Doosan Škoda Power engineered a 46 MW steam turbine as part of a combined cycle system. When high subsynchronous vibrations forced a trip in turbine operation at just 27 MW versus the rated 46 MW, the ISFD design provided the rotordynamic stability needed to achieve full power output.
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While both machines are considered internal combustion engines that convert a fuel into mechanical energy, they differ in how they operate and the applications where they are used.
A gas turbine mixes compressed air with either natural gas or liquid fuels (Diesel or aviation fuel) then ignites it, producing high-speed exhaust gases that rotate turbine blades connected to a shaft that powers a generator or other machinery. They are used in large-scale power generation and aviation/marine propulsion systems.
A gas engine uses either spark or compression ignition on natural gas, biogas, propane, or liquid gasoline/Diesel fuel to push pistons inside cylinders. They can be used in electricity generation, industrial cogeneration, and transportation (buses, trucks) applications.
As with most types of heavy machinery, a gas turbine’s operational lifespan depends on how well it is both constructed and maintained. Gas turbines have comparatively long lifespans because they tend to operate continuously and have fewer moving parts.
While this timeframe can’t be distilled down to a specific number, gas turbines can operate continuously if they are inspected every hours to help ensure that worn bearings/rotors or damaged blade tips aren’t causing excessive vibration. Turbines should also be overhauled every 25,000 to 50,000 hours, depending on service.
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Turbine Min. efficiency Max. efficiency TM 34.9 50.9% LM 35.7 54.9% LMXPRESS 39.0 55.7% LM 40.0 55.6% 6B 33.4 52.4% GT13E2 38.0 55.6% 7E 33.8 52.9% 9E 34.3 55.3% 7F 38.5 60.5% 9F 38.7 60.4% 7HA 42.0 43.3% 9HA 42.9 44.0%