Sludge in Waste Water Treatment Plant and by-products for industrial bio-sludge and mineral sludge
The Fjell Turbo Disc Dryer is designed for indirect heating by steam (6-10 bar). 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 welded stays exposed to tear, wear, fatigue and corrosion.
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. Fjell has in its process for drying with disc-driers a patented process solution reducing usage of steam with approx. 40% from normal driers.
Model TD150 - Heating surface 150m2
Model TD200 - Heating surface 200m2
Model TD 300 - Heating surface 300m2
Model TD400 - Heating surface 400m2
Model TD500 - Heating surface 500m2
Model TD600 - Heating surface 600m2
Model TD650 - Heating surface 650m2
Advantages between Fjell TD Dryer vs. other Rotadisc dryers:
- Forged claws can be welded with high precision in flat position using robots.
- Welds can be inspected with NDT before assembly.
- Welds are not exposed to the material to be dried, thereby risk for stress corrosion cracking is eliminated.
- Welds do not seal between pressurised and non-pressurised 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 leakages in foot welds between discs (big problem with Rotadisc).
- Smooth disc surface secures efficient self-cleaning and maximum heat transfer.
Standard Range Fjell Turbo Disc Dryers are from 200 kg evaporation per hour to 5000 kg per hour
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