Desuperheaters
DESUPERHEATER (DSH)
Desuperheater (DSH): means to reduce the excess superheat. Means by which this is achieved is called as desuperheater.
Type of desuperheaters (DSH) as per combination with valve, as below:
- Desuperheater (DSH) with saperate spray water valve.
- Desuperheater (DSH) with integral control valve.
- Type of desuperheater (DSH) as per construction:
– Venturi type dsh.
– Variable section spray nozzle.
VENTURI TYPE DESUPERHEATER (DSH)
The Desuperheater (DSH) model is a non-integral type, which requires a separate spray water control valve.
This is a venturi design with sharp edge against the flow- guarantees a high steam velocity and well atomized cooling water in the point of injection.
The cooling water enters the nozzle via the water flange. The pressure difference between the cooling water and the steam, to ensure good controllability and satisfactory atomization of the injected cooling water should not be below 2 bar.
This desuperheater (DSH) model is made for installation in steam pipes 1” to 4” . This type of DSH is, as standard, mounted between flanges.
This desuperheater (DSH) model is made for installation in steam pipes 1” to 4” . This type of DSH is, as standard, mounted between flanges.
VARIABLE AREA TYPE DESUPERHEATER (DSH) : Single nozzle
In order to maintain a constant pressure inside the injection nozzle, the later is preloaded by a spring calibrated in function of the water/steam differential pressure.
Any load variation in the external water control valve is immediately compensated by change of orifice of the nozzle. Depending upon customer piping requirement, this DSH has 02 configurations.
Angle connection Straight connection.
There are 03 nozzle sizes available, based on the water quantity & differential pressure between water & the steam. This DSH can be used from 6” upto 40” line size. (steam pipe size).
VARIABLE AREA TYPE DESUPERHEATER (DSH): Multiple nozzles
The Desuperheater (DSH) model is a non-integral type, which requires a separate spray water control valve.
CD-M desuperheater (DSH) is used in desuperheater (DSH) applications where large spray water flows are required for cooling of the steam.
It is a part of steam line with a number water atomizing nozzle, nozzles attached to it.
The nozzles are connected to a common spray water pipe connection. The water flow is controlled by separate spray water control valve. The nozzle is variables orifice.
The nozzle body is screwed in to the nozzle holder, which housed the nozzle and distributes to water to the nozzle.
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