Venturi Desuperheater & Annular Venturi Desuperheater

Principle of Operation of Venturi-Type Desuperheaters

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. Venturi Desuperheaters and 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.

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. Unit operates in a vertical position with flow moving upward.

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Fig. 6950 Venturi Desuperheater is designed with flanges on the inlet and outlet of the tail piece. The body is clamped between the tail piece and customer’s flange on the pipeline.

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Fig. 6940 Venturi Desuperheater, similar to Fig. 6950 is mounted directly in the pipeline. Fig. 6940 consists of a body and tail piece that is joined by flanges. Flanges at each end are used to connect to the steam line.

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Fig. 6940M Mini Venturi Desuperheater was developed to handle small quantity steam applications and where other standard desuperheaters are too large. This desuperheater may be installed in any position. Due to its small size, Fig. 6940M is designed and machined from bar stock; having only a body and nozzle.

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Fig. 6985 Annular Venturi Desuperheaters  consist of a cone body mounted concentrically in a pipe. The cone body acts as the water distributor and also forms an annular steam flow passage with the pipe inner dimension. The water inlet pipe projects through the pipe wall and holds the cone in place. The steam line connections are normally flanged.

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