GEA Niro’s conventional spray dryer produces chemical powders at any rate and configuration. It is the mother of all spray drying plants as it was this plant that formed the basis for the development of all other GEA Niro spray dryers.

The conventional spray dryer is referred to as a one-stage spray dryer as the powder has its final moisture content when discharged from the plant. It is available with a rotary atomizer in a co-current air flow as well as with high pressure nozzles in both co-current and counter-current air flow. It can also be delivered with one point product discharge with the exhaust air from the cyclones or bag filter collector or two point product discharge from the drying chamber base and cyclone or via a pneumatic conveying/cooling system. If operated with a rotary atomizer or high pressure nozzles, the conventional spray dryer produces powders with a mean particle diameter (D50) between 0.02 - 0.2 mm. If low pressure nozzles are used, a mean particle diameter (D50) between 0.1 – 0.3 mm is produced. It all depends on the product.

For some products, an after dryer like the VIBRO FLUIDIZER™ might be necessary. This can be connected to the drying chamber base for the final drying/cooling of the product. By choosing this drying mode, the plant becomes a two-stage dryer with improved energy consumption, increased capacity and in some cases even an improved product quality as a result.

Flexibility
GEA Niro’s conventional spray dryer is a very flexible and cost efficient solution with regards to both investment and operation. It is designed to meet the requirements of customers and their local authorities, and as such it is available as:

• Plants with highly effective filters and/or scrubbers to ensure emission of clean exhaust process air.
• Semi closed plants utilizing low oxygen combustion gas as process air
• Semi closed plants, self-inertised and featuring incineration of the exhaust air
• Closed cycle concept with nitrogen purged process gas circuit

Safety aspects
All GEA Niro spray drying plants comply with the strictest requirements for health, safety and environmental compliance. GEA Niro’s expertise in explosion control design is unequaled and an invaluable aid whether considering ATEX, other European safety directives or local regulations. All plants designed and supplied by GEA Niro will enable the end user to obtain approvals put forward by the EU directive.

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