Economisers, also referred to as flue gas heat exchangers, belong to the standard equipment of a boiler system as they can be used in more or less any system.
Although the investment costs of an integrated economiser are roughly 7 – 15% of a boiler, it also increases the efficiency of the system by up to 7% and therefore normally pays for itself within several months of operation.
Info on Flue gas temperature or flue gas loss
The flue gas flow emerging from the steam boiler is still at a temperature of 200 – 280°C. The economiser is equipped with highly-efficient heat exchangers for dry flue gas heat recovery which makes use of this thermal potential at a high temperature level. The heat extracted from the flue gas is normally used for feed water heating and therefore improves the boiler efficiency.
Flue gas condensing via flue gas heat exchangers, air preheating or a feed water cooler can be used to further improve efficiency.
Info on Condensing heat exchanger
Info on Air preheater
Info on Feed water cooler
Various types of economiser are available for the system-specific mode of operation of the flue gas heat exchangers which is optimised for each individual plant.
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