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