Expander-generator configurations are suitable for any application where energy recovery is the goal, such as pressure let-down or geothermal applications. In this scenario, high pressure gas is expanded through the turbine to extract the gas’ potential heat energy. The potential energy extracted from the gas is used to drive the shaft which then drives the generator, producing power.
In most cases the rotating speed of the expander turbine will be much higher than the generator. When this is the case, it is necessary to add a gearbox between the expander and generator to reduce speed.
This design can be utilized in any hydrocarbon, chemical/petrochemical, and air separation applications where energy recovery is economically practical.
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