Belt, drum, and fluid bed dryers

SmartCLEAN is an innovative belt-washing device for belt dryers that maximizes drying efficiency. The improved rotating design allows optimum cleaning with minimal use of high-pressure water. SmartCLEAN guarantees stable product quality over the whole belt width.

The patented ANDRITZ AG belt drying system (BDS) is characterized by its flexibility and ability to use a wide range of energy sources, particularly low-grade waste energy. BDS can be used for drying a broad range of products, such as industrial and municipal sludge, cow manure, biomass, as well as pre-treated municipal solid waste.

Drying and cooling take place in the product chamber, only by convective heat and mass transfer between the fluidization gas and the product. Two different designs are available, for normal and high temperature applications.

ANDRITZ supplies the complete process, not only for sludge treatment, but also for biomass drying - from wet milling to drying, fine milling and pelleting, all from a single source.

The fluid bed drying system with direct feeding converts dewatered sludge into almost dust-free granules with > 90% DS. The thermal heat for evaporation of the water is transferred indirectly by a heat exchanger immersed in the fluid bed. The fluid bed dryer is integrated into an inert gas loop system.

The rotary drum dryer is suitable for drying woody biomass, agricultural products, and municipal solid waste (MSW). For the production of alternative fuels as well as in the area of waste-to-energy, ANDRITZ Vandenbroek rotary drum dryers are applied to decrease the moisture of the material to the desired level fo downstream process steps.

This type of fluid bed is used for salts and minerals, as well as for basic chemical products, mainly for lower line capacities. It is characterized by the vibrating design of the fluid bed to enhance fluidization of the products with a wide particle size distribution range.

The spray granulation process converts a water-containing solution, paste or suspension or a melt into a granule. The granulation and the drying processes take place at the same time. Any kind of crystallization and mechanical dewatering equipment can be replaced by an SGS type fluid bed. The final product granules are dust-free and easy to handle.

The ANDRITZ drum drying system, DDS, dries and granulates different types of municipal, industrial, and agricultural sludges. The dewatered sludge is granulated in a mixer tailored to the application. It is then dried in the triple-pass drum (three concentric cylinders revolving around a joint axis) in a convective drying process to < 10% residual moisture. The sludge is conveyed pneumatically by the stream of hot gases, ensuring an evenly dried, pasteurized product.

Drying and cooling can be combined in a single unit. Stationary equipment for convective and contact heat and for mass transfer without rotating or vibrating parts. Low maintenance required.