The economizer (English name Economizer) is a device installed in the lower part of the flue of the boiler to recover the waste heat of the exhausted smoke. The boiler feed water is heated to the heated surface of the saturated water under the steam drum pressure, because it absorbs the high temperature smoke. The heat of the gas reduces the exhaust gas temperature of the flue gas, saves energy and improves efficiency, so it is called an economizer.
The steel tube type economizer is not limited by pressure and can be used as a boiling type, and is generally made of a carbon steel pipe having an outer diameter of 32 to 51 mm. Fins and ribs are sometimes added to the tube to improve heat transfer. The steel tube type economizer consists of horizontally arranged parallel elbow tubes (known as serpentine tubes).
Economizers are mainly used in industry, and are gradually becoming popular in agriculture and some related industries.