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ANDRITZ Belt drying system BDS
Biomass drying - necessary pretreatment for further processes
ANDRITZ offers complete plants for biomass processing – including all steps from wet grinding to drying and fine grinding and pelletizing, all from a single source.
One of the world’s largest belt dryers for biomass, with eight meters belt width, in Lauterbach, Germany
ANDRITZ belt dryer installation for biomass drying
Why biomass drying?
In most cases, biomass (torrefaction, wood bark, woodchips, sawdust, and energy chips) have to be dried before being used in pelleting, briquetting, incineration, and gasification. By reducing the biomass water content to 10-15%, its calorific value is increased from 2 kWh/kg to approximately 4.5 kWh/kg. This cuts the transport and storage costs, as well as creating ideal conditions for direct firing or optimum pelletizing properties, both for industrial and high-grade wood pellets. As a result of the drying process, less fuel input is required to generate energy, which also reduces the pollutant emissions caused by the combustion system.
Dryer selection criteria
- Flexibility in processing different biomass qualities and mixtures
- Use of various energy sources, including waste heat
- Low energy consumption
- Low emissions (dust, VOCs, exhaust gases)
- High safety standards (fire/explosion protection, interlocks, etc.)
ANDRITZ belt dryer for biomass - once-through, hybrid, or closed-loop type for low-value heat
- Hot water (70-120° C)
- LP steam
- Thermal oil
Other biomass dryers
Pneumatic dryer for pulverized firing:
- High final dryness, exceeding 96%
- High degree of milling - small particle size and clear cut-off
Fluid bed dryer for particulate and granulate material:
- With or without in-bed heat exchanger
- Drying and cooling
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