Desuperheater VariVent

VARIvent Desuperheater

The VARIvent desuperheater is designed for effective steam temperature reduction using venturi-shaped nozzles that ensure rapid and efficient atomization of water. It is ideal for moderate load conditions and applications where accurate temperature control is essential.

The VARIvent gives you the following benefits:

Precise temperature control
Efficient water atomization
Handles low-velocity steam
Suitable for moderate load changes.

For sales or commercial inquiries please contact us at marine@insatech.com.

Enhanced Fluid Velocity Control with VARIspring DM Nozzles

VARIspring DM nozzles offer a significant advantage over fixed area nozzles by minimizing the limitations associated with reduced fluid velocity when flow rates decrease. These nozzles are designed to automatically adjust the passage area as the flow rate changes, ensuring that fluid velocity remains optimal for effective atomization.

The operation of the VARIspring nozzle is based on a spring mechanism that keeps the plug in a closed position until water pressure rises sufficiently. When the pressure differential (Δp) between the steam and water increases, it eventually overcomes the spring load, allowing the plug to open. Water then flows through specially designed passages in the nozzle body, creating a swirling effect before contacting the conical surface of the plug. This design enables the nozzle to atomize water in a conical pattern effectively. Additionally, the spring load is adjustable, allowing for customization of the start opening pressure to meet specific application needs, ensuring consistent performance across varying flow conditions.

Key Features of the VARIvent Desuperheater

The VARIvent has several benefits. See some of them listed below:

Venturi-shaped nozzles: Ensures efficient water atomization
Fixed area design: Optimized for moderate load conditions
Enhanced turbulence: Promotes rapid mixing and evaporation of water
Wide flow range: Accommodates multiple nozzles for varying flowrates
Precise temperature control: Ideal for maintaining accurate steam temperature
Low-velocity steam handling: Effective even with minimal approach temperatures.

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Solutions for Diverse Industries

The VARIvent has several applications possibilities. The main applications are:

Steam process.
Heat exchangers
Ejectors
Pressure reducing stations
Drum dryers
Gas process.

The various industries which the desuperheater is suitable for includes, but is not excluded to:

Marine
Oil & gas
General industry
Power.

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Efficient Desuperheating with VARIvent

For optimal performance and efficiency, the installation of the VARIvent desuperheater must follow specific guidelines. One key aspect is the use of a filter to prevent any potential clogging or damage to the nozzles caused by impurities in the water supply. The recommended filter mesh size varies depending on the model of the VARIvent desuperheater. For smaller models, such as DV1 to DV3, a mesh size of at least 35 is recommended, while medium-sized models, DV4 to DV6, require a mesh size of 25. Larger models, DV7 to DV10, should use a filter with a mesh size no smaller than 16.

These filters ensure that debris is effectively screened out, safeguarding the performance and longevity of the desuperheater. Proper filtration allows the VARIvent nozzles to operate efficiently, ensuring precise temperature control and smooth operation in various steam load conditions.

Parts for the VARIvent Desuperheater

The VARIvent has several parts, we have listed them below (and see the drawing):

Stud
Nut
Water flange
Pin
Gasket
Nozzle pipe
Vortex ring
Nozzle
Body
Eyebolt
Nameplate

Customized Steam Flow Analysis for Optimal Temperature Control

Our technical department offers the ability to analyze steam velocity within the VARIvent desuperheater, ensuring the perfect fit for your specific application. Through advanced flow simulation, we can study and design the optimal geometry for your system. The simulation highlights how the venturi shape accelerates the steam flow, ensuring excellent water atomization and precise temperature control.

The visual representation with color-coded velocity changes helps to clearly demonstrate this acceleration, ensuring efficient performance tailored to your needs.

Varivent Flow Simulation Carraro 1024 16X9

For technical questions

Martin Søvind Jensen

Tel: +45 2761 4502

Email: Martin.Sovind@insatech.com

Write to Martin

For commercial inquiries

Astrid Mihut

Tel.: +45 5537 2095

Email: Marine@insatech.com

Technical Specifications
Function	Temperature control of the overheated steam
Size	Water: 1/2 ”, 1”, 1 1/2 ”and 2” Steam flange: 3 ”, 4”, 6 ”, 8”, 10 ”, 12”, 14
Connection	Water: Flange RF Vapor: Flange RF or welding end (BW or SW)
Pressure step	Max ANSI 2500
CV	0.017 to 7.3
Material	Valve body: Steel or stainless steel Nozzle head: Stainless steel (SS410)
Temperature	Max 570 °C
Nozzles	10 different sizes
Rangeability	Up to 7: 1
Water quantity	Max 40 m³ per. hour
Delta P	Min. 0.5 bar(g) Max. 40 bar(g)
Cooling	Max Up to 5 °C above the saturation point of the outlet vapor

Product specifications and manuals

Brochure - VariVent -Carraro
English | pdf

Download
Manual - VariVent -Carraro
English | pdf

Download

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Carraro - Desuperheater VariVent

Enhanced Fluid Velocity Control with VARIspring DM Nozzles

Key Features of the VARIvent Desuperheater

Solutions for Diverse Industries

Efficient Desuperheating with VARIvent

Parts for the VARIvent Desuperheater