FJELL TURBO DISC DRYER
High performance - No steam leakages - Long-lasting durability
Fjell Turbodisc Dryer
The distinct difference between the TD dryer and most other disc dryers is that staybolt welds (or welds of other means to maintain the integrity of the disc when exposed to internal steam pressure) is entirely on the inside of the disc.
In part drying, or scalping, the challenge is often the content of chlorides and acids, which can cause severe corrosion problems with the rotor. A particularly annoying problem in the industry has been stress corrosion cracking in welds. This is avoided in the Fjell Turbo Disc Dryer because of the unique design and manufacture:
Welds not exposed to external environment in dryer, thereby risk for stress corrosion cracking is eliminated.
Welds do not seal between pressurized and non-pressurized side. Thereby risk for steam leakage is eliminated.
Claws act as reinforcement beams in radial direction, thereby increasing the lateral bending strength of the discs, which reduces the risk for stress corrosion cracking in foot welds between discs
The dryer can be designed according to any customer requirements. Sizes may vary from 8m2 to 750m2.
The Fjell TD Dryer can also be designed for drying in vacuum for saving nutritions by lowering the evaporation temperature.
In the year 2000 Fjell Technology Group AS decided to develop a robust and energy efficient disc dryer specially designed for modern manufacturing methods like robotic welding. We had a competent staff including senior personnel with experience from design, manufacturing and the installation of about 2000 Stord dryers since the introduction of the technology, which took place in the late fifties.
We added some young innovative engineers skilled in state of the art engineering design and analysis techniques. The result was the Fjell Turbo Disc Dryer with a unique patented disc design, based on efficient manufacturing techniques.
Problems with leakage after some wear and tear on the welds are practically eliminated, as we have experienced zero leakage on our discs produced after year 2000.
The Fjell Turbo Disc Dryer is designed for indirect heating by steam (6-10 bar). The dryer can be delivered for vacuum drying of temperature sensitive raw materials. The largest heating surface is the rotor, but additional heating surface is available as an option on the stator. The product to be dried is slowly, but vigorously, transported from inlet to outlet end by a paddle system mounted on the disc periphery.
Product discharge is normally done continuously by a speed controlled extraction screw conveyor. The discs are mounted on a heavy central shaft with a highly efficient condensate removal system integrated. Scraper bars ensure agitation between the discs, which is necessary for an efficient evaporation. The moisture evaporated from the product is collected in a high top vapour dome, and continuously removed.
Dryers can be supplied in all practical sizes, in all common materials of construction (carbon-, stainless-, and duplex steels), and approved and inspected according to the leading international design codes and standards (PED, ASME, JIS, GOST, DNV, Lloyds, Bureau Veritas etc..) The dryer has a unique endurable patented rotor design without traditional welding, which stays exposed to tear, wear, fatigue and corrosion.
Fjell has in its process for drying with disc-driers a patented process solution reducing usage of steam with approx. 40% from normal driers.