Submitted by :

Samim Akhatar110106238

ME-D ,4th year

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contents Definition of steam turbine

Types of steam turbine

HP (high pressure) steam turbine

IP (intermediate pressure ) steam turbine

LP (low pressure ) Steam turbine

Over speed balancing of steam turbine

Governing of steam turbine

Definition of steam turbine

A steam turbine is a device that extracts thermal

energy from pressurized steam and uses it to do

mechanical energy on a rotating output shaft.

Types of steam turbine

HP(High Pressure ) Turbine

IP(Intermediate Pressure )Turbine

LP(Low Pressure) Turbine

HIGH PRESSURE STEAM TURBINE

• Steam first strikes on guide blades carrier and then HP rotor.

• Single flow casing

• Double shell casing

• Inner casing and outer casing

• Main steam pressure : 247 ATA

• Main steam temperature: 505 °C

• Number of stages 19

Rotor of HP Turbine• It is made of mild steel.

Casing of HP Turbine There are two types of casing in HP steam turbine.

Inner casing which is made of mild steel .

Inner casing which covers rotor and protects leakage

Outer casing cover whole rotor and inner casing arrangement .

Blades of HP Turbine

• Blades of HP steam turbine is made of steel alloys

• HP blades are the smallest blades of the steam turbine

• It is made on the special types of CNC machine which

works in 5-axises

Intermediate pressure turbine IP steam turbine is a double flow turbine

Double casing (inner and outer )

Steam pressure 54 ATA

Steam temperature 593°C

Rotor of IP Turbine

It is made of mild steel.

IP rotor is in different shape.

Blades of IP Turbine

IP blades are made of steel alloys.

The shape of IP blades are different from the HP

blades.

IP blades are larger than HP blades.

Casing of IP turbine There are two types of casing in IP turbine.

Inner and outer casing .

Casings are made of cast iron.

low Pressure Turbine Double flow.

Double shell casing.

Single admission from top half.

Outer casing and condenser rigidly connected.

Rotor of LP turbine It is made of mild steel.

It is heavier than HP and IP Turbine.

Casing of LP turbine

Two types of casing inner casing and outer casing.

Casing material is cast iron.

Blades of LP Turbine• Blades are made of steel alloys.

• Smaller blades of LP turbine are made in three spindle

five axis CNC machine.

• Blades of LP is the largest among the other turbine blades.

Over speeding of turbine rotor Turbine rotor is tested on the over speed balancing

tunnel

Balancing speed -180 to 3600 rpm

Maximum caccum-1 torr

Minimum vibration limit-1 micron

Governing system Governing system controls the steam flow to the

control signals.

Steam turbine is equipped with high pressure

governing systems.

Conclusions

Turbine is capable of long term reliable operation.

Quick start up and load changes.

Operational flexibility

Continuous information on residual turbine life

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