Products

Desuperheaters

Venturi Desuperheater and Annular Venturi Desuperheater

Principle of Operation

Fig. 6980 Annular Venturi Orifice Desuperheaters eliminate the accumulation of unvaporized water in the pipeline. Water droplets that fail to vaporize immediately after injection must fall back into the high-velocity throat region of the desuperheater where it again comes into contact with the steam until completely vaporized. They can be installed horizontally or vertically – depending on operating conditions.

Figure 6985 Annular Venturi Desuperheater sectional drawing

Fig. 6950, Fig. 6940 and Fig. 6940M Venturi Desuperheaters and Fig. 6985 Annular Venturi Desuperheaters reduce steam temperature by bringing superheated steam into direct contact with water. The steam is cooled through the evaporation of the water. These desuperheaters are recommended for use under a wide range of conditions, including steady and variable flows. They can be installed horizontally or vertically up. When installed vertically up, turndown ratio can be increased substantially.

Figure 6940 Venturi Desuperheater cutaway

Fig. 6950, Fig. 6940 and Fig. 6940M Venturi Desuperheaters and Fig. 6985 Annular Venturi Desuperheaters are normally used in areas where atomizing steam is not available. Turndown ratio is dependent upon a wide variety of factors, such as installation (horizontal or vertical), amount of residual superheat, and piping. Depending on exact flow conditions, units are capable of 20% to 2% flow variation. Pressure drop normally varies between 2 psi and 10 psi.

Fig. 6980 offers increased turndown capacity in comparison to other desuperheaters. The only maintenance necessary to keep the S&K Annular Venturi Orifice Desuperheater operating properly is the removal of scale due to evaporation.

Figure 6950 Venturi Desuperheater sectional drawing

Advantages

Both Venturi Desuperheater and Annular Venturi Desuperheater units can be installed in either the horizontal or vertical position. There are no moving parts, are made of heavy duty construction; no special pipe supporting or thermal sleeve required.

Applications

Venturi Desuperheater, Annular Venturi Desuperheater, Annular Venturi Orifice Desuperheater

Control steam temperature to dryers in paper industry.
Heating system steam conditioning.
Process steam temperature control.
Control temperature to evaporators.
Used upstream of heat exchangers to minimize size and cost and maximize heat transfer.

Venturi Desuperheater and Annular Venturi Desuperheater only

Reduce temperature of high pressure steam reduced to a usable pressure.
Industrial heating system.
Food processing.
Control steam temperature to dryer drums in paper manufacturing.

For more detailed information about Venturi, Annular Venturi Desuperheaters and Annular Venturi Orifice Desuperheaters, Bulletin 6D & Bulletin 6D Supp. Literature.

To submit a Request for Quote (RFQ) for Venturi, Annular Venturi Desuperheaters and Annular Venturi Orifice Desuperheaters, Adobe PDF or submit an online interactive RFQ Form for Desuperheaters.