Boiler mountings & accessories

BOILER MOUNTINGS & ACCESSORIES

PRESENTED BY :ANJAN BACHHAR

DIPANKAR MONDAL

SURYA KANTA GARAI

ABOUT THE DURGAPUR PROJECTS LIMITED

DPL today is a renovated and upgraded power utility. A total of seven units of different capacities have an aggregate 701-mega watt of installed capacity out of which 2X30 mega watt units have been decommissioned reducing the aggregate installed capacity to 641 mega watt. After fulfilling total requirement of its command area customers, DPL surplus power goes to the West Bengal State Electricity Distribution Company Ltd (WBSEDCL).

ABOUT THE DURGAPUR PROJECTS LIMITED

Description Unit I Unit II Unit III Unit IV Unit V Unit VI

Unit VII Total

Capacity(MW)

30

30 77 77 77 110

300 641

Date of Synchronisation 10.6.1960 10.4.1960 23.4.1964 19.6.1964 4.5.1966 3.7.1985 29.12.2007

Date of Commercial Operation

10.8.1960 10.6.1960 23.6.1964 29.6.1964 4.7.1966 1.1.1987 30.4.2008

Present Status Decommissioned  DecommissionedIn

operationIn

operationIn

operationIn

operationIn operation

Fitting and devices which are necessary for the safety and control are knows as boiler mountings

• A pressure gauge is an instrument by means of which thepressure exerted inside a vessel can be measured.• There are two types of pressure gauges, one is Bourdon tubepressure gauge and the other is diaphragm type gauge.

MAEC. MECHANICAL

PRESSURE GAUGE

FUSIBLE PLUG

Function: To extinguish fire in the event of water level in the boiler shell falling belowa certain specified limit.It protects fire tubes from burning when the level of the water in the water shell falls abnormally low and the fire tube or crown plate which is normally submerged in the water, gets exposed to steam space which may not be able to keep it coo

FEED CHECK VALVE

I ) To allow the feed water to pass into the boiler. ii) To prevent the back flow of water from the boiler in the event of the failure of the feed pump.

Fitting or devices which are provided to increase the efficiency of the boiler and help in the smooth working of the plant are knows as boiler accessories.

• Feed water heater• Boiler feed pump• Steam separator

Air Preheater• Used to recover heat from the exhaust flue

gases• Installed in between the economizer and

chimney.• Temperature of the required air for

combustion is passed through the air preheater where its temperature is raised.

• Then hot air passed to the furnace.ADVANTAGES• Gives higher furnace temperature which

results more heat transfer thus increase evaporative capacity

• Approximately boiler efficiency increases about 2% for each 30-35oC rise in air temperature.

FEED WATER HEATER

Function : Feed water heater is a plant in which the feed water is heated before it enters into a boiler, the heat being taken from the exhaust steam of steam engineCylinders or of steam turbines.

BOILER FEED PUMP

Function : The pump is used to deliver feed water into a boiler against boiler steam pressure.

STEAM SEPARATOR

Function : The steam separator is fitted before the steam engine or steam turbine to separate water particles from steam.