power station in bangladesh

Ashuganj Power Station Company Ltd (APSCL).

Romel Barua,

Sujoy Dutta,

Mir Md. Anisuzzaman,

Asif Rahman Mithun,

Jubaraj Baidya,

Jungko Moni Chakma,

Department of Mechanical EngineeringDhaka University of Engineering &Technology, Gazipur -1700

Name of the Plant : Ashuganj Power Station Company Ltd.

Established : 1966

Location : Ashuganj, B-Baria.

Business : Power Generation.

No. of Generating Units : 9

5 Steam turbine

2 Gas Turbine & 1 Steam turbine

1 Gas Engine

Manufacturer : Brown Brovary & GEC England.

Type of Fuel : Natural Gas

Area of Plant : 263.55 acres

Two Steam Units : 64 MW Each

Three Steam Units : 150 MW Each

Gas Turbine : 56 MW Each

One Steam Turbine : 34 MW

Gas Engine Power Plant : 50 MW

Installed Capacity : 777 MW

Present De-rated Capacity : 731 MW

To know about APSCL

To gather practical knowledge and experience.

To know implementation of theoretical study inreal world.

To know about various kinds of powergeneration system

To know about water treatment plant.

Steam Turbine Power Plant

Gas Turbine Power Plant

Combined Cycle Power Plant

TURBINE

SECTION

WATERTREATMENT

PLANT

BOILER

SECTION

GENERATOR

SECTION

Raw waterpump

River water

Sedimentation Basin

70% Purewater

Intermediate Basin

Clear water pump

DrinkingWater

Ble

ach

ing

Gravel filter

Overhead Tank

Filter water pump

Scavenger Filter

Cat-ion

Exchanger

Anion Exchanger Mixed Bed Demineralized

Water

Feed Water tank

Sludge pump

River

Condenser

Demineralization Plant

Sedimentation basin: This basin included aluminumsulphate with polyelectrolyte which is used to removeclay from water.

Intermediate basin: store clear water

Gravel filter: This filter included col, sand, and stone.Which remove the insoluble particle.

Cat-ion exchanger: Remove metallic substances.

Overhead tank: It store filtered water.

Scavenger filter: Remove the organic substance.

Anion exchanger: Remove the non- metallic substances.

Mixed bed: It helps to remove both metallic and non-metallic substances if Cat-ion and Anion exchanger failto remove those.

Demineralized water tank: Which help to storage thedemineralized water and then through the water into thefeed water tank or condenser.

Safety Valve

Water Level Indicator

Fusible Plug

Blow Down Valve

Main Steam Stop Valve

Feed Check Valve

Pressure Gauge

Safety Valve

It’s acting as a guard of boiler

resist high pressure of steam

inside the drum.

Water Level Indicator

It indicate the water level

inside the boiler vessel.

It shows the level in the

boiler drum.

Boiler fusible plug

It is used to protect the boiler

against damage due to

overheating caused by low

water level in the boiler.

Blow Down Valve

To discharge the mud and

other sediments deposit

in the boiler.

Steam Stop Valve

It regulate the flow of steam

from boiler to the steam pipe

or from one steam pipe to the

other.

Feed Check Valve

It controls the supply of water

from the boiler when the feed

pump pressure is less than

boiler pressure or pump is

stopped.

Pressure Gauge

It indicates the pressure

of steam in boiler.

Feed Pump

Economizer

Air Preheater

Super Heater

Feed Pump

The feed pump is a pump

which is used to deliver feed

water to the boiler.

Economizer

Economizer increases the temperature of feed water using

Waste of heat to flue gases leaving the boiler throughchimney.

Super Heater

The function of super heater is to increase the temperature of the steam above its saturation point.

Air Preheater

It’s a general term to describe

any device designed to heat air

before another process with the

primary objective of increasing

the thermal efficiency of theprocess.

Steam turbine is a prime mover in which pressure energy of steam is converted into mechanical energy & further electrical energy.

Classification of steam turbine

Reaction turbine

Impulse turbine

Steam turbine operation is based on the Rankine cycle with 4 key stages:

1‐2: Pressurize

2‐3: Heat

3‐4: Expand

4‐1: Condense

In impulse turbine the steamis expanded while it movesthrow them In the former typesteam expands in the nozzleand its pressure doesn’tchange as it moves over theblades while in reactionturbine the steam expandscontinuously as it passes overthe blades and thus there is agradual fall in pressure duringexpansion

Steam enters the HP (high pressure) turbine through nozzle. It consist of 21 stages.

Re‐heated steam enters the IP (intermediate pressure) turbine under the re‐heated conditions. It consist of 14

stages.

Steam from the cross over pipe enters the center of the LP. It consist of 6 stages.

The condenser rapidly cools

the steam leaving the LP turbine.

Condensed water is passed

through a series of pre‐heaters

on its way back to the mainboiler.

A combined cycle system uses the same heat energy togenerate power from two different thermodynamiccycles.

It’s operated by

1. The Brayton cycle (Gas turbine)

2. The Rankine cycle (Steam turbine)

Advantages: High power-to-weight ratio.

It’s capital cost is lower than that of steam turbine

plant.

Smaller, fewer moving parts and less vibration than a

reciprocating engine.

Low toxic emissions, less pollution compared to

conventional steam or gas turbine power plants

Runs on a wide variety of fuels, and high operating

speeds.

Disadvantages:

Higher operating cost. Higher maintenance cost because of the combination of

two systems. Longer start-up. Less responsive to power demands, and a shrill whining

noise. The capital cost is higher than that of gas turbine plant.

In a Brayton cycle

combustion

and exhaust take place

at a constant pressure.

The Rankine cycle is a modelthat is used to predict theperformance of steamturbine systems. TheRankine cycle is an idealizedthermodynamic cycle of aheat engine that convertsheat into mechanical work

The HRSG uses waste heat contained in the exhaust of a gas turbine to convert water to steam. The steam is then used to power a steam turbine and supply auxiliary plant processes

Deaerator is used to remove the dissolve gases like oxygen and carbon dioxide

A mechanical draft cooling tower with a fan at the discharge which pullsair through tower. The fan induces hot moist air out the discharge.

APSCL is playing an important role in producing power for

the nation and thus contributing to the country’s economy.

We are glad that we got a chance to compete our

internship program in APSCL; which is the second largest

power company in Bangladesh. We believe that, the

practical experience that we gathered in APSCL will help

us in our professional life.

Thank You