Section 13 Steam-Water Cycle Turbime

Front 1

1. Steam pressure

2. Arrangment

3. Steam flow

4. Cycle

Back 1

Turbine classification

Front 2

Charles parsons

Back 2

Anglo-irish. Inventor of steam turbine - 1884

Front 3

1. Tandem compound

2. Cross compound

Back 3

Tubine arrangements

Front 4

Cross compound

Back 4

All the turbines arr not joined on the same shaft

Front 5

Tandem compound

Back 5

Turbines joined end to end to each other on one shaft.

Front 6

Steam flow

Back 6

Main steam flow may breakup to flow in two, three, or more directions. Single flow, double flow, triple flow turbines.

Front 7

Main steam header

Back 7

Contains and guide the flow of superheated, high pressure steam from boiler to the turbine.

Front 8

Basket strainer

Back 8

Prevent large solid materials from reaching & damaging the turbines.

Front 9

Reheat turbine

Back 9

A turbine that steam is send back to the boiler for reheating after partially used. Can be name double reheat if it is used twice.

Front 10

Steam chest

Back 10

A manifold that contains the control (governing) valves

Front 11

Inlet bends

Back 11

Connects the steam chest with the nozzle block in the H.P turbine.

Front 12

Nozzle block

Back 12

The first row of stationary nozzles.

Front 13

Full arc steam admission

Back 13

A procedure used to start up turbines from a cold or relatively cool condition.

Front 14

Rotating blades or bucket

Back 14

Bladed attached to the rotor.

Front 15

Control (governing) valves

Back 15

Controls the flow of steam to the high pressure turbine

Front 16

Main stop valve

Back 16

Admit steam to the turbine for normal operation or shut off the flow of steam quickly if emergency conditions requires it.

Front 17

Stationary blades or nozzles

Back 17

Blades attached to the cylinder or casing.

Front 18

Cold reheat steam

Back 18

Exhaust or steam from H.P turbine piped back to the boiler to be reheated.

Front 19

Reheat stop valve

Back 19

A valve placed in series in the hot reheat steam line to I.P turbine to protect it from dangerous overspeeds in an emergency. A further insurance that the hot reheat steam flow will be cut off.

Front 20

Intercept valve

Back 20

A valve depended upon to close quickly in the case of a trip.

Front 21

I.P turbines

Back 21

A turbine that has a longer blades for the expanded steam.

Front 22

Crossover

Back 22

A pipe or duct that contains and guides the steam from I.P ti the L.P turbine. It is the largest pipe on the entire turbine.

Front 23

Hot reheat steam

Back 23

Steam returning from the boiler that will go to the I.P turbine.

Front 24

Extractions

Back 24

Various points along the blade path steam which bled steam off the turbine. This steam is piped to the feedwater heaters.

Front 25

L.P turbine

Back 25

The last bit of work of steam will be extracted in this turbine.

Front 26

Close cycle

Back 26

A cycle where the turbine uses the water over and over again.

Front 27

1. Single impulse stage

2. Curtis stage

Back 27

Types of impulse turbine

Front 28

Impulse type

Back 28

A type of turbine which is the force that turns the turbine comes from the impact of the steam jet on the buckles or blade.

Front 29

Reaction type turbine

Back 29

A type of turbine which all blades, being the same shape act like nozzles with steam expanding, gaining velocity and losing pressure while passing through.

Front 30

1. Impulse type

2. Reaction type

Back 30

Fundamental types of steam turbine

Front 31

Sealing

Back 31

Stop steam leakage past the blading or diaphram to get top efficiency from unity

Front 32

Balance drum

Back 32

Compensate the force that pushes the rotor towards the low pressure of the rotor.

Front 33

H.P turbine casing

Back 33

Made of high grade steel to withstand the initial pressures and temperature of the steam.

Front 34

I.P turbine casing

Back 34

Usually made of the same quality steel as the H.P turbine but somehaw have a thinner wall section.

Front 35

L.P turbine casing

Back 35

Turbine casing usually made of fabricated low carbon steel plate.

Front 36

Turning gear

Back 36

A motor driven combination of gears that engages and turns the turbine shafts at a very slow speeds. Used to prevent the shaft from warping or bowing.

Front 37

Atmospheric relief

Back 37

Consist of a thin lead of copper diaphram across an opening in the exhaust hood which ruptures at a slight internal pressure.

Front 38

Shaft seal

Back 38

Prevent steam leakage out of the turbine and air leakage into the turbine.

Front 39

1. Carbon - used in small turbines

2. Water -

3. Labrynth - used in many turbines

Back 39

Three common type of shaft seals.

Front 40

1. Lubricating oil

2. Control oil

3. Main oil tank

4. Main shaft pump

5. Auxiliary oil pump

Back 40

Oil system

Front 41

Lubricating oil

Back 41

Oil that is supplied to bearing to allow the turbine shaft to rotate without touching the bearings.

Front 42

Control oil

Back 42

Same oil used to lubricate the bearing except it is at higher pressure. Used in the valves in the main steam header.

Front 43

Main oil tank

Back 43

Tank or reservoir that is located below and away from the heat of the turbine to reduce fir hazards.

Front 44

Main shaft pump

Back 44

A centrifugal pump mounted directly on the turbine shaft in the frint standard.

Front 45

Auxiliary oil pump

Back 45

Provide oil to the system during start-up and shutdown.

Front 46

1. Oil driven booster pump - located in the oil tank. Drive the oil from aux. pump

2. Ejector - use small quantity of h.p oil to lift large quantity oil

3. Hydrogen seal - reduce pressure from main oil system

4. Turning gear oil pump - small pump that supply oil to the bearings and turning gears

5. Oil coolers - reduce oil temperature

6. Vapor extractor - motor driven fan that removes oil vapor

Back 46

Primers for main shaft pump