A desuper heater is for low and medium pressure and temperature application as required in process plants. Attemperator covers all the range depending on the steaming parameters of the boiler. In functioning, they are both the same i.e. they remove the superheat of the steam with help of water either by direct contact with spray or by indirect contact in a heat exchanger.
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An attemperator is a device which regulates the temperature of somewhere, such as a boiler, by passing hot or cold water through a coil of spring.
Most desuperheater applications reduce the temperature of steam generated by high pressure/high temperature boilers to levels required in process operations. The primary function of a desuperheater is to lower the temperature of superheated steam or other vapors. This temperature reduction is accomplished as a result of the process vapor being brought into direct contact with another liquid such as water. The injected water is then evaporated. The two main reasons for lowering the steam or vapor temperatures are: (1) to permit operation of downstream process equipment that is designed for lower temperatures, and (2) to maintain a constant temperature for processes that require precise temperature control. 1.2
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