Boiler Auxiliary Components

Boiler components

SYSTEM	COMPONENTS	FUNCTION
Combustion air system	Forced drought fan	Draws air from the top of the boiler room and discharges it through ducting into the air heater.
	Air heater	It situated in the flue gas ducting from the boiler and transfer heat into combustion air before it ducted to the air register
	Air register	The heated air is now ducted into the furnace register, a circular cowling which swirls the air blowing it into the furnace combustion area at an air ratio of between 10 and 20%
Boiler feed water system	Economizer	It is a heat exchanger situated in the exhaust gas ducting and it transfers heat to the boiler feed water on it way back to boiler
	Boiler feed control valve	Controls the supply of feed water to the top drum. This valve opens and closes as the steam pressure and steam flow varies.
	Boiler feed check valve	It is a non return valve situated before the drum used to isolate the feed water flow to the boiler
Fuel oil system	Fuel oil pump	Transfers fuel oil from the storage to the fuel oil heater
	Fuel oil heater	Heats the fuel oil to a high temperature to maintain viscosity
	Fuel oil duplex filters	From the heater the oil is pumped through the duplex fine mesh filters
	Fuel oil burners	It is located in the air register, it atomises the fuel spraying it into the furnace
Steam system	Steam superheater	This is an enclosed nest of pipes located in the hottest section of the exhaust gases, usually to the underside of the steam drum
	Soot blowers	long perforated pipe which rotates spraying steam or compressed air onto the boiler tubes removing the coating of soot deposited by the combustion gases. Located around the water tubes economiser and air heater tubes.
	Safety valves	two high pressure safety valves fitted to the steam drum outlet piping and one safety valve fitted to the superheater outlet header.

 

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