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Spin Flash Dryers

Anhydro Spin Flash Dryers are designed for the continuous drying of both cohesive and non-cohesive pastes, filter cakes and high-viscosity liquids. The main components of the spin flash plant include a feed system, a patented drying chamber and a bag filter.

Configuration:

Closed-circuit dryer

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Overview of the Spin Flash Drying Process

Patented Technology and Global Reach

Widely acclaimed by customers across a variety of industries worldwide, this patented process offers a faster and more energy-efficient alternative to spray drying. With more than 350 spin flash dryer installations worldwide, SPX FLOW combines experience with cutting-edge technology to deliver value-added solutions for our customers.

Key Components of the System

Feed System

The feed system consists of a feed vat, where a discontinuous flow of product is buffered and fragmented by an agitator prior to continuous drying. A variable-speed feed screw (or a pump, in the case of fluid feed) forwards the product to the drying chamber.

Drying Chamber

The rotor at the conical base of the drying chamber fluidizes product particles in a drying-efficient hot airflow pattern, in which any wet lumps are rapidly disintegrated. Hot air is supplied by a temperature-controlled air heater and a speed-controlled fan, entering the drying chamber at a tangent to establish a turbulent, whirling airflow.

Airborne fine particles pass through a classifier at the top of the drying chamber, while larger particles remain in the airflow for further drying and powdering.

The drying chamber is rigidly designed to withstand pressure shocks in the event of explosive combustion of flammable particles. All bearings are effectively protected against dust and heat.

Bag Filter

Powder from the drying chamber is collected in the bag filter, while the outlet air exits the system at the top via a suction fan.

Special Features and Innovations

Our patented spin flash plant features an inverted cone for high-velocity air inlet at the base of the drying chamber, preventing the risk of product build-up. This unique technique has proven to be the customer-preferred method for drying paste in the industrial sector.

State-of-the-art automation systems are available for spin flash drying plants, enabling fully automatic control, process optimization, data logging, traceability and maintenance scheduling.

Capacity Profile

1 kg/h to 40 tons/h

Advantages

High drying efficiency, resulting in low energy costs
Continuous processing with short processing times
Low operator overheads and minimal maintenance costs
Controlled residence time, enabling high-temperature drying
Controlled particle size
Very fine powder production, eliminating the need for milling
Minimal space requirements
High-pressure, shock-resistant chamber for safe drying of flammable products
Available in FDA- and cGMP-compliant configurations

Key Applications

Agrochemicals
Ceramics
Food and feed products
Inorganic chemicals
Organic chemicals
Pharmaceuticals
Pigments and dyestuffs
Waste products

Drying Chamber

Drying chambers are available in standard sizes with diameters ranging from 200 to 2,500 mm. The standard material of construction is stainless steel; however, the drying chamber can also be supplied in Hastelloy® or other corrosion-resistant materials as an option. Drying chambers designed for inlet temperatures above 500°C feature special heat-resistant stainless steel air distributors. The spin flash dryer offers the following benefits:

Continuous processing with short processing times for higher yields
Complete temperature and speed control for optimum drying and minimal residence time
A special feed agitator and screw conveyor to prevent bridging
A drying chamber with a patented inverted conical base and rotor system for air velocity control, high drying efficiency and product protection

Small-Scale Plants

Ready-to-install small-scale spin flash drying plants are available for research purposes and small-scale production. They are simple to operate and easy to dismantle for cleaning.