Features of Boiler Air Preheaters

Features of Boiler Air Preheaters

Air preheater is a kind of heat exchange device that uses the heat of flue gas at the end of the boiler to heat the air needed for combustion. As it works in the area of lower flue gas temperature, it recovers the heat of flue gas and reduces the temperature of flue gas, thus improving the efficiency of the boiler. The increase in combustion air temperature is conducive to fuel ignition and combustion, reducing the heat loss caused by incomplete combustion of fuel.

Air preheater can reduce the exhaust temperature to a certain extent, improve the boiler efficiency, improve the ignition conditions, help to strengthen the combustion process, reduce the heat loss after incomplete combustion, increase the furnace temperature, reduce the water-cooled wall heating surface, and provide drying conditions for the pulverising system. According to the air preheater heat transfer method, generally can be divided into through the wall heat conduction, cold fluid does not contact the inter-wall heat transfer and hot and cold fluids take turns to contact the heated surface of the regenerative heat transfer heat storage element.