Application: Test work to obtain operational conditions and, in particular, form the basis for design of industrial-sized fountain nozzle plants.

Capacity: The evaporative capacity is 40-175 kg/h and the minimum feed requirement is about 300 kg.

Specification: The chamber has a 2.55 m diameter, a 3.0 m cylindrical height and a 60 degree conical bottom. The 1250 kg/h (a boosting to 2200 kg/h is also possible) of drying air is heated by a direct-fired LPG burner and has a maximum inlet temperature of 550 °C.

For spray drying and low temperature spray congealing (where the feed temperature is below 90 °C), the feed is supplied by a Mono pump. As an option, this can be followed by a membrane pump (with a maximum feed pressure of 60 bar). The feed is atomized by either a counter-current (fountain) pressure or two-fluid nozzle. However, rotary atomizer (type F15) or a co-current nozzle can also be applied. The product collection can be either one-point or two-point: Chamber, cyclone, and/or bag filter are available.

Conventional, single-stage spray dryer
The single stage co-current spray dryer with rotary or nozzle atomization can discharge product from either a single-point, with the exhaust air from the cyclone or bag filter collector, or a two-point, from chamber base and collector via a conveying / cooling system.

These configurations are used where the powder directly meets the quality specification. Otherwise, a vibrating fluid bed can be provided for post-drying or cooling of the chamber fraction.

Spray congealing
The transition of a melt from a fluid state to a rigid or solid state by cooling is called congealing. The various droplet formation techniques and the efficient droplet / air contact make the spray drying concept ideal for making spherical particle powder by congealing of melts.

Recent developments in spray cooling include the use of congealing chambers with integrated bag filters for congealing and separation of product in one unit. This design is very compact and thus space-saving. Recent developments in spray cooling include the use of congealing chambers with integrated bag filters for congealing and separation of product in one unit. This design is very compact and thus space-saving.