Attemperator
Vs Desuperheater
The basic
function of Attemperator and Desuperheater is same that is to desuperheat the
steam or reducing the steam temperature by spraying water in the flowing steam.
Then what is the difference between them. Let us discuss that in brief.
The meaning
of the word attemper is to Regulate. Hence, attemperator means regulator. The
Attemperator is used to regulate the steam temperature at the outlet of Final Superheater.
It is used in Boiler application and is located between primary & secondary
superheater and between secondary and tertiary superheater. It is installed to
regulate the final temperature as per the project requirement.
Desuperheaters
are generally combined with Pressure reducing stations. It is located at the downstream
of pressure reducing valve and are used for process applications and for
turbine bypass.
Following are the differences between them:
- Attemperator is used based on the boiler requirements and hence covers wide range of steam parameters whereas Desuperheaters are located after pressure reduction and hence it is used in Medium or low pressure steam.
- Attemperator deals with superheated steam at both upstream and downstream of it. The temperature regulation in Attemperator needs to be very precise whereas in desuperheater 5-7 degrees above saturation temperature in outlet steam is acceptable.
- The spraying water quality in attemperator is very important as the steam is fed to Turbine hence the spray water should essentially be Boiler feed water with a strainer installed before Temperature control valve whereas for desuperheater both boiler feed water or condensate can be used based on the requirement.
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