Turboexpander-Generator

turboexpander-generator

The energy extracted from a gas expanding across the turbine can be converted into electric power by connecting the load side of the expander shaft to a generator. The Turboexpander-Generator arrangement is typically available in three configurations.

EXPANDER-GEARBOX-GENERATOR

In most cases, the operating speed of the expander will be at a higher RPM than the operating speed of the generator. It is therefore necessary to utilize a speed reduction gearbox to facilitate appropriate coupling speed.

In one such configuration, the high speed expander shaft is connected to a high speed coupling that transmits the torque to a speed reduction gearbox. The gearbox is then coupled to the generator. This configuration is typically used in medium to high power applications.

EXPANDER-GENERATOR

In most cases, the operating speed of the expander will be at a higher RPM than the operating speed of the generator. It is therefore necessary to utilize a speed reduction gearbox to facilitate appropriate coupling speed.

In another such configuration, the expander wheel is directly mounted on a shaft that also serves as the high-speed gearbox pinion eliminating the high-speed coupling. As with the Expander-Coupling-Gearbox-Generator, this configuration is also used in medium to high power applications.

EXPANDER-HIGH SPEED GENERATOR

In a third configuration, the expander wheel is directly mounted on a shaft that also serves as the high-speed generator’s shaft, eliminating the gearbox entirely. This configuration is limited to the power capacity of high-speed generators and is typically used in low to medium power applications.