Turbines

Question 1

Power generation turbines

Answer 1

• Used to drive generators
• Turbine output and compressor on single shaft
• Reliability and efficiency key customer needs

Question 2

Mechanical drive turbines

Answer 2

• Used for power and drivers for large oil pumps
• Also used in pipelines to increase fluid head
• Operated at varying speeds
• Operational profile constant
• Reliability and start availability key customer needs
• Turbine output and compressor on two shafts

Question 3

Single shaft turbines

Answer 3

Actual compressor connected to gas turbine and load on the same shaft

Use:

• Generator drive: 98%
• Mechanical drive: 2% (centrifugal compressor for LNG

Constant speed application
Axial compressor can work at its nominal speed

Question 4

Two shaft turbines

Answer 4

Axial compressor connected to high pressure turbine, load connected to power turbine (low pressure turbine

Use:

• Generator drive: 5%
• Mechanical drive: 95% (centrifugal compressor for L and pumps)

Question 5

Compressor

Answer 5

Draws air into the engine, pressurizes it, and feeds it into the combustion chamber

Question 6

Combustion system

Answer 6

Typically made up of a ring of fuel injectors that object a steady stream of fuel into the combustion chambers where it mixes with the heated air

This process produces a high pressure, high temperature gas stream that enters and expands through the turbine section

Question 7

Turbine

Answer 7

An intricate array of stationary and rotating aerofoil section blades. As hot combustion gas expands through the turbine, it spins the rotating blades. The rotating blades perform a dual function: they drive the compressor to draw more pressurized air into the combustion section, and they spin a generator to produce electricity

Question 8

3 sections of a Gas Turbine

Answer 8

Compressor
Combustion system
Turbine