Mechanical

Maintenance

Department-

Balance of

Power

MMD-BOP

Boiler

Fuel Oil Pump House

CW Pump House

Compressed Air System

Hydrogen Plant

Raw water pump house

DG Set

MMD-BOP 2

BALANCE OF PLANTS

74 meters long.

two passes with platen super heaters.

The boiler's four corners are designated as

A,B,C,D for communication purpose

BOILER

At bottom, leftover ash eliminated from

chimney and electrostatic precipitator (esp) is

collected in bottom ash hopper

collected ash mixed with water is sent to the

ash water pond.

FIRST PASS

From 22 metres to 37 meters the furnace is

situated

The furnace is divided into17 partitions

designated as AA, A, AB, B, BC till HH from top

to bottom.

Partitions designated with single letters have

inlets through which raw materials like coal,

air, water and different oils are sent through.

Oils are pumped using oil guns.

FIRST PASS

From 56metres to 74 the final super heaters

exist along with platen heaters and roof

heaters.

There exist water walls all along the boiler.

There exist soot blowers at particular height to

blow the ash that is left over after combustion

process

MMD-BOP 7

Contains the economiser, low temperature super heater, low

temperature re-heater, air pre heater, force draft fan, induced

draft fan and scanner fan.

The second pass focuses primarily on increasing efficiency.

SECOND PASS

The boiler is initiated by firing light diesel oil (LDO) along with air and coal.

LDO is pumped through the oil guns that are situated at the eight corners in a tangential direction.

LDO is used until the temperature reaches 400 degrees Celsius after which high fluid oil (HFO) is used.

The gases that are produced after combustion of coal are called flue gas which is used up in economizer and Pre-heaters

WORKING OF A BOILER

The dam water enters through the economiser

through feed pump.

Gets pre heated in the economizer and enters the

bottom ring header from where the water enters

the spiral water walls in the boiler in pass 1.

The water walls heat the water and send them

over to roof heater and then to low temperature

super heater next to the platen heater and then

to final super heater where most of it is

converted to super critical fluid.

FIRST PASS

This super critical fluid comes back to boiler

to reheat through re-heater line.

This liquid passes through the economiser in

pass 2 then to low temperature re-heater

Then back to final super heater

SECOND PASS

The soot blowers blow the ash with help of

steam to the bottom ash hopper.

The air preheater heats the secondary air

along with primary air so that the efficiency is

increased. Secondary air is used when there is

excess need of air in the furnace. This

secondary air is blown through force draft fan.

The scanner fan present in the boiler is used

to cool the sensors present in the boiler

The induced draft fan is used to remove or

suck the flue gas from the boiler

Providing Auxiliary Ignition Energy to coal-air mixture

Total Ignition Energy = Inherent Ignition Energy + Auxiliary

Ignition Energy

When heat becomes stable, heat available from combustion

of coal exceeds Total Ignition Energy, no more Auxiliary

Energy is required

MMD-BOP 14

FUEL OIL SYSTEM

Unloading through Unloading pumps.

Storing in Storage tanks.

Transferring to Day oil Tanks

MMD-BOP 15

FUEL OIL HANDLING SYSTEM

MMD-BOP 16

TYPES OF OIL USED

Circulate CW in condenser and condensing turbine exhaust

system

Discharge valve is hydraulic operated

Discharge water used to cool motor windings

MMD-BOP 17

COOLING WATER SYSTEM

Manufacture KIRLOSKAR BROTHERS LIMITED

Pump type BHM135, Single stage, Self water lubricating pump

Motor Rating 3600 KW

Speed 330 RPM (NOM)

Make WEG

Motor Weight 35300 KG

Pump Discharge 39825 M^3/HR

Total Head 26 M

Pump Ef ficiency 92 %

Pump Input 3049.73 KW

Type Three phase induction motor

Power 3600 kw

Speed 330 rpm

Frequency 50Hz

Duty S1

Voltage 11kv

Current 245.5 amp

Insulation class F

Ef ficiency 96(-2%)

MMD-BOP 18

CW PUMP SPECIFICATION