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节能器是安装于锅炉尾部烟道下部用于回收所排烟的余热的一种装置，可以加热锅炉给水。由于它吸收高温烟气的热量，降低了烟气的排烟温度，节省了能源，提高了效率，所以称之为节能器。节能器可用于各类锅炉。

The economizer is a device installed in the tail chimney of the boiler to recover the waste heat of the exhaust gas, which can heat the boiler feed water. Because it absorbs the heat of high temperature flue gas, reduces the exhaust flue gas temperature, saves energy and improves efficiency, so it is called economizer. The economizer can be used in all kinds of boilers.