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Desuperheaters

Our range of Desuperheaters

Transvac direct contact steam Desuperheaters (sometimes known as attemperators) are used as a method of steam temperature control, reducing the temperature of superheated steam.

 

A desuperheater’s function is to produce steam temperatures approaching saturation temperature (typically to within 3°C). To cool the superheated steam, a medium, usually water, is entrained and flashed into vapour by absorbing heat from the steam.

 

 

Desuperheating & Pressure Reducing Stations

 

Transvac can provide complete Desuperheating & pressure reducing stations, including control valves, temperature sensors, pressure transmitters, instrumentation and pipework, all mounted on a support skid.

 

For steam recovery solutions, please visit our Thermocompressors page.

Desuperheater Applications

To reduce the temperature of steam discharged from turbine by-pass systems on power plants for heat exchangers, dump stations etc.

To improve heat transfer efficiency of indirect contact heat exchangers – shell & tube, plate-type, reactor heating jackets

To reduce the temperature of steam on direct contact applications such as food cooking kettles, in-line steam heaters, tobacco drying plant and paper mills

Desuperheater Construction

 

Our units are available built to our own proprietary codes of practice (typically ASME B31.3) or to ASME VIII Div 1, PD5500, Stoomwezen and other recognised design codes. Units can be CE marked on request. Connections are sized to suit the process conditions. Standard materials of construction include carbon steel or stainless steel. For high temperature applications we offer chrome molybdenum steel (F11, P11, F22, P22 etc), however we can also manufacture in other metals or alloys requested.

 

Further information about Materials of construction can be found here.

Desuperheater Construction

Desuperheater Gallery

Transvac Steam Atomising Desuperheater

24” NB Steam Atomising Desuperheater

Transvac Venturi Type Desuperheaters

Two Size 18″ Venturi Type Desuperheaters

A Transvac Wafer-Type Spray Nozzle Desuperheater

A Wafer-Type Spray Nozzle Desuperheater

A Transvac Multi-Nozzle Spray Type Desuperheater

A Transvac Multi-Nozzle Spray-Type Desuperheater

Transvac Spray Type Desuperheater

A view inside a Transvac Spray Type Desuperheater

Transvac Size 2" Venturi Type Desuperheater

Transvac Size 2″ Venturi Type Desuperheater

Types of Desuperheater

We offer a range of Desuperheater types, to suit specific needs of your steam process;

Transvac Venturi Type Desuperheater (VTD)

Venturi Type Desuperheaters

The venturi principle is used to create regions of high velocity and turbulence which produces intimate contact between the steam and cooling water.

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Transvac Spray Type Desuperheater (STD)

Spray Type Desuperheaters

A simple in-line model where cooling water injected into the centre of the unit via an atomizing nozzle sprayed in the direction of the steam flow.

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Transvac Steam Atomising Desuperheater (SAD)

Steam Atomising Desuperheaters

A high-pressure auxiliary steam supply is used to atomise the incoming water within the diffuser of the unit.

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Advantages of Transvac Desuperheaters

Low cost

Simple operation

Robust design

No moving parts to wear

Minimal steam pressure drops

Flexible design options

Venturi Type Desuperheaters

The venturi principle is used to create regions of high velocity and turbulence which produces intimate contact between the steam and cooling water.

 

Applications

Suitable for most general plant applications, except where high turndowns on cooling water are required.

  • Turndown 10:1
Transvac Venturi Type Desuperheater (VTD)

Spray Type Desuperheaters

A simple in-line model where cooling water injected into the centre of the unit via an atomizing nozzle sprayed in the direction of the steam flow.

 

1. Simple Spray Type Nozzle (SND)

The assembly is designed for mounting on a suitable flanged branch on the steam pipework. A thermal sleeve installed downstream of the unit is recommended.

 

2. Complete Spray Type (STD)

A complete unit ready for installation including spray nozzle, nozzle housing, thermal sleeve within a flanged shell.

 

Applications

Suitable for most general plant applications, except where high turndowns on cooling water are required.

  • Turndown 10:1
Transvac Spray Type Desuperheater (STD)

Steam Atomising Desuperheaters

A high-pressure auxiliary steam supply is used to atomize the incoming water within the diffuser of the unit.

The auxiliary steam pressure needs to be at least 1.5 times the inlet pressure with a minimum pressure of 3 barg.

 

Applications

Turndown to 20:1 or 50:1 with water recycle

Transvac Steam Atomising Desuperheater (SAD)