Desuperheater VariFrigo

Kvadrat Medium Carraro Desuper Varifrigo

VariFrigo Desuperheater

The VariFrigo from Carraro is designed for precise liquid injection into gas streams, ideal for low-temperature desuperheating applications down to -100°C. It’s commonly used in processes like ammonia and carbon dioxide cooling, ensuring safe and efficient performance.

The VARIfrigo is giving you the following benefits:

Operates to -100°C
Versatile applications
Stainless steel construction
Heavy-duty insulation.

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

Versatile Low-Temperature Desuperheater

The VariFrigo desuperheater is designed not only for steam cooling but also for a wide range of applications where liquid injection into gas streams is required. It operates effectively in low-temperature environments, handling liquids down to -100°C. Frequently used in processes involving ammonia and carbon dioxide, the VariFrigo excels in adjusting gas temperatures within piping systems.

The device is ideal for moderate pressures, generally not exceeding 10 bars, and is versatile enough to meet the requirements of cryogenic processes such as LNG, nitrogen, oxygen, and ethylene handling.

Key Features of the VARIfrigo Desuperheater

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

Handles low temperatures down to -100°C
Suitable for liquid injection into gas streams
Constructed with stainless austenitic steel for temperatures below -50°C
Designed for moderate pressures up to 10 bars
Heavy insulation prevents gas pockets and icing.

Exactly what you need? Contact us now!

Solutions for Diverse Industries

The VARIfrigo are designed to deliver precise steam temperature control and efficient water atomization across a range of applications such as:

Process gases
Steam.

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

Marine
Oil & gas
General industry
Power.

Need more information? Contact us here

Why is it Called a Variable Area Nozzle?

In a fixed-area nozzle, the spray velocity decreases at low flow rates because the outlet section remains constant. In a spring-assisted variable area (DM) nozzle, the spring load is nearly constant, but the flow area adjusts automatically. This maintains the pressure difference (∆p) and prevents a drop in water velocity. The nozzle's plug reduces the flow area as the flow rate decreases, ensuring that the pressure and velocity remain consistent.

However, the plug's thrust area varies throughout its movement, meaning the relationship between the spring force and pressure difference is not perfectly linear. The plug's larger thrust area when near the closed position can reduce ∆p, leading to less efficient atomization at lower flow rates. This is why tests are needed to find the optimal relationship between flow rate and pressure difference.

Durable Design for Low-Temperature Operation

For applications below -50°C, the VariFrigo desuperheater is typically constructed from stainless austenitic steel to ensure durability and safety in extreme conditions. The system's design includes heavy insulation to prevent dangerous gas pockets within the piping and to reduce the risk of icing on stuffing boxes.

Additionally, the use of long bonnet extensions is recommended to accommodate the insulation, ensuring smooth and safe operation under these challenging conditions.

Best Practices for Efficient Desuperheating

To ensure efficient desuperheating, careful consideration must be given to the installation and arrangement of the desuperheater within the steam system. Proper placement enhances steam-water mixing and optimizes temperature control.

The key is to maintain ideal steam velocity at the injection point, as higher velocity improves turbulence and facilitates faster evaporation of water droplets.

Additionally, the location of temperature sensors, straight pipe runs, and nozzle orientation must be configured in line with engineering standards. These practices, illustrated in the accompanying figures, are critical to achieving optimal performance and precise temperature regulation in various desuperheating applications.