TECHNOLOGY

The BELT DRYER is a low temperature double pass dryer, which is designed for the gentle drying of wet product such as sewage sludge but can also be used for wood shavings and chips, bark, grasses, leaves, green cut, hulls and husks, litter from animals, fermented residues, marcs and pomaces, bio waste and bio coals and animal faeces.

DRYING PROCESS

The wet mechanically dewatered product (18-30% DM) is continuously fed in top of the dryer through a distribution hopper that spreads the product evenly on the belt. Products such as sewage sludge must be granulated first in order to increase the surface area of the material to obtain more efficient heat transfer and evaporation. A full drying to 95% DM is possible. A perforated stainless belt transports the product gently through the dryer to avoid friction of the product and thereby reducing dust explosion risk. As the product passes through the successive chambers, the internal air temperature increases progressively heating up the material to the desired temperature (approximately 70-130°C). At the end of the top belt the product transfers to the second belt where the evaporation process is completed. The product is cooled down as it passes back to the exit of the dryer. The temperatures inside the dryer chambers are constantly monitored, these measurements automatically control the speed of the belt and the feeding device, and this gives the most efficient drying time and consistent quality of product.

BENEFITS:

  • Low temperature gentle drying of product
  • Retention time is typically 50- 90 minutes
  • Safe and dust free atmosphere
  • Energy optimisation through waste heat recovery
  • Low maintenance requirements due to simple design and slow moving parts
  • Modular construction with simple expansion possibilities
  • Odour control

Download product brochure belt dryer

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