Wheel space Temperature

Wheel space temperature

2×GE FRAME 9FA GAS TURBINE

750MW COMBINED CYCLE POWER PLANT

What is Wheel space of a turbine?

Wheelspace

It is the space (very small axial distance) between rotating wheel that isturbine buckets and the stationary diaphragms which the turbine nozzles areinstalled on).

What are Wheel space thermocouple?

Wheel space T/Cs are used to measure temperature around wheel space region of gas turbine.

Mounted wheelspace thermocouple

Why Wheel space temperature is monitored monitoring?

There are two wheel spaces perturbine stage where temp ismonitored --a forward wheel spaceand an aft wheel space. In order toprotect the hot gas componentstemp is measured

Turbine Hot gas component

1st stage forward wheel space

First stage aft wheel space

2nd stage a forward wheel space

2nd stage a aft wheel space

3rd stage forward wheel space

3rd stage aft wheel space

Turbine Hot gas component damage

Bucket fail at the connector to disk

Wheel Space Temperature at start up

1FI-1 :- first forward inner wheel space thermocouple

Wheel Space Temperature at Acceleration

Wheel Space Temperature at FSNL

Wheel Space Temperature at Loading

Wheel Space Temperature atPreselect Load

Wheel Space Temperature at Base load

Comparative study

SPEED (RPM) LOAD (MW)

FIRST STAGE FORWARD AND AFT

WHEEL SPACE TEMPERATURE (AVERAGE)

5 at (START UP) 0 26

1564 at (ACCLN) 0 27

3011 at (FSNL) 0 30

3000 at (LOADING) 24 43

3000 at (PRESELECT LOAD) 146.9 487

3000 at (BASE LOAD) 233 490

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temperature

Temp

The plot shows as the load increases temperature around wheel space region increases.

Load

Graph indicating comparative study.