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Kiekens desuperheater

In the KIEKENS venturi desuperheater, cooling water enters through a special streamlined spray nozzle. On the surface of this special spray nozzle a thin film of water will be created. The dynamic energy of the steam flow breaks the surface tension of the film, creating a conical shaped spray of atomized water. Ideal mixing is achieved by high steam flow turbulence, caused by the interaction of the venturi effect and the special shaped spray nozzle. Fast and total evaporation of the cooling water is now accomplished which means that rapid adjustments are possible, and also avoiding the need for any protective liners in downstream piping.

Custom designing - For any size, standard or range.
Simple installation - In any position. Short straight pipe runs.
Limited control loops.
Easy maintenance - No moving parts, no pipe liners and no
welding in the construction. Large spray apertures avoids the
spary nozzle becoming choked.
Energy saving - No need for water supply pressure
significantly higher than operational steam pressure and no
need for atomizing steam.
Large desuperheating range - It is possible to handle
extremely large differences in enthalpy between inlet an
outlet steam flows.

The body of a KIEKENS venturi
desuperheater can be made of various kinds of forged steel.
From carbon, light/ high alloyed and stainless steel to special
materials. Spray nozzle and matching parts are made of
stainless steel.
According to specific requirements, the KIEKENS venturi
desuperheater can be installed into a piping systems with
either flanged connections or welded joints. All structures
are made according to ANSI, BS, DIN, JIS, or any
other accepted international standards as specified by client.

The range of steam flow which can be accommodated by the KIEKENS venturi desuperheater depends on the available pressure drop. As previously explained, the cooling water spray is maintained by the dynamic energy of the steam flow. Accordingly, if the steam flow goes down from maximum to zero, at some point there will be insufficient dynamic energy to atomize the spray water. That dynamic energy is related to the pressure drop over the desuperheater. Research and experience have shown that the pressure drop over an KIEKENS venturi desuperheater has to be 0.05 bar minimum, in order to provide sufficient dynamic energy for proper atomizing of the spray water.

The A.T.- TEMP desuperheater valve regulates the amount of injection water by varying the number of injection nozzles in operation. This means the water pressure remains constant, and an excellent and near uniform spray quality is achieved across the entire operation range. Control of nozzle opening is achieved by the positioning of a piston that is operated directly by an actuator mounted on the valve. This simple design means no separate water injection control valve is necessary.

Heavy Duty:
Fully forged body construction.

Standard Duty:
Welded body construction.

Multiple nozzle heads
The A.T.-TEMP desuperheater can be equipped with a variety of spray heads. The uniform body threading accepts spray cylinder
heads with a wide range of Kv (Cv) values. Standard configurations have either 6 or 9 equally sized spray nozzles, but combinations are available- the so called ‘mixed’ spray heads. This feature enables the A.T.-TEMP desuperheater to be customized to specific requirements.

Advantages

No steam side pressure drop:
A negligible steam side pressure drop makes this type suitable for those applications where steam side pressure drop is limited, as in turbine exhausts.

No need for a separate water control valve:
Due to an integrated and directly actuated water injection control valve no separate valve is required.

High- tech nozzles:
The spray nozzles, equipped with a special designed swirl disk, are constructed using the most up to date technology available, resulting in a fine symmetrical hollow cone spray.

Reliability:
Injection spray nozzles are sealed by a vacuum brazing process, maintaining the integrity of these components under the most extreme conditions.

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