Controlling Parameters

Question 1

Main control loops

Answer 1

• Start up
• Speed/load
• Temperature
• Shutdown

Question 2

Auxiliary control loops

Answer 2

• IGV
• Manual FSR
• Acceleration

Question 3

Start up sequence Fire

Answer 3

Supplies sufficient fuel to combustors to provide good ignition

Question 4

Startup sequence warmup

Answer 4

Reduces the fuel flow rate and hold it constant in order to reduce thermal shock

Question 5

Startup sequence accelerate

Answer 5

Allow the turbine to accelerate gradually

Question 6

Starting motor types

Answer 6

• Electric
• Diesel
• Hydraulic
• Expansion turbine

Question 7

Why do we need to control temperature?

Answer 7

• Safety

- To avoid damages to the GT and to the exhaust duct

Question 8

Which temperature do we want to control?

Answer 8

Firing temperature is what we want to control

Question 9

How do we control GT temperature?

Answer 9

Thermocouples

Question 10

Where do we measure the temperature?

Answer 10

We measure at the exhaust gas temperature

Using the gas law we can calculate the firing temperature moving ideally on the B-J cycle from the exhaust (4th) to the Firing (3rd)

Question 11

IGV Control curves

Answer 11

IGV temperature control acts allowing more air to enter inside the axial compressor and so inside he combustion chamber that will lower the temperature

Question 12

Fuel gas control GE system requirement to avoid condensation

Answer 12

Gas has to be heated 50.4 f. Over the dew point at that specific pressure