Bark storage
Biomass Screw conveyorStacker reclaimer

Biomass storage and reclaiming

ANDRITZ has complete solutions for storing and utilizing different biomass materials

The challenge

The cost of producing energy from biomass is very much dependent on efficient handling of the various types of biomass available and the efficiency of each process. Biomass needs to be mixed and equalized so that the next process works optimally and emissions are minimized.

The solution

The scope of supply can vary from complete plants to individual equipment delivery. ANDRITZ has a depth of experience in project management, ensuring reliable deliveries and excellent economic results for customers.

Storage systems for biomass

  • Round silo storage
  • A-frame linear storage
  • Stocker reclaimer storage
  • Circular stacker reclaimers
  • Open or closed storage piles

The goal of any storage system is not only to provide an inventory buffer for continuous production, but also to blend different types of biomass to a homogenous mix and/or equalize the moisture content among materials. That is why the storage volume needs to be large enough to allow blending and homogenization. The discharge units from the storage system continue this operation by further mixing and blending the material to be fed to the boiler or gasifier.

ANDRITZ supplies equipment and complete systems for storing biomass materials ranging from small semi-automated systems to large fully automated systems. These systems are available in open or closed (covered) configurations.

ANDRITZ linear storage for biomass is normally closed/covered to prevent moisture from entering the biomass during the storage period. A shuttle belt conveyor stacks the linear pile and moves back and forth above the pile to distribute biomass evenly. Reclaiming is performed by screw reclaimers under the pile. The reclaimers feature variable speed drives to adjust to capacity requirements. Screw reclaimers can be cantilevered or supported at both ends.

ANDRITZ round silo storage for biomass is a closed/covered silo with a screw reclaimer under the silo discharging the biomass to the center of the silo. The silo can be constructed of steel or concrete, with or without insulation. This type of storage equalizes the moisture of the biomass very well. Screw reclaimers can be cantilevered or supported at both ends, depending on the diameter of the silo and the biomass material.

An ANDRITZ circular stacker reclaimer provides a cost-effective method of automated storage pile building and reclaiming for most biomass materials. The system, including conveyors, is installed above ground so that civil work is minimized.

The stacker can be equipped with optional luffing so that dust emissions are minimized. The chain reclaimer operates over the pile and blends the biomass being conveyed to the boiler or gasifier. Where covered storage is required, the circular stacker reclaimer can be covered by a dome.

The circular stacker reclaimer delivers 100% live storage volume such that all the material stacked is accessible by the reclaimer, requiring no additional equipment or labor.

Features of storage systems

  • Wide range of proven solutions
  • First-in, first-out discharge method
  • Homogenous flow of biomass to boiler or gasifier
  • Environmentally friendly and dust-free construction
  • Accommodates rain/snow conditions
  • Can be configured to deliver fully live pile volume (no dead areas)
  • Rugged construction
  • Minimal noise emissions

Screw reclaimers to discharge biomass from storage pile or silo

  • CenterScrew
  • CantiScrew
  • ParaScrew
  • RotabinScrew
  • Stoker reclaimer

Features of screw reclaimers

  • Wide range of screw reclaimer configurations to optimize storage area
  • Precise and reliable outfeed, also under severe conditions
  • Wide exposed length enables 100% active storage volume
  • Supports first-in, first-out discharge principle
  • Handles wide range of materials (e.g. wood chips, pellets, bark, hog fuel, peat)
  • High uptime with rugged and proven design
  • Wear-resistant screw construction


ANDRITZ Oy, Finland

Phone: +358 (0)20 450 5555

Contact us


Phone: +1 (770) 640 2500

Contact us

Related links

Biomass receiving and conveying

Biomass processing and size reduction


Boiler infeed

Biomass boilers

Ash handling

Biomass gasifiers

Biomass drying

Biomass pelleting

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