Conical Screw Rotors for Biomass

Conical screw rotors for biomass manufactured as a spare parts project for an installed machine at a power plant.

Why are screw rotors conical?

• The screw rotors are positioned in a large inlet hopper and are continuously covered by material
• The conical design of the screw rotors ensures more uniform emptying of the hopper and prevents blockage at the outlet
• Read more about conical screw flights here

What can BEMA offer in the production of screw rotors as spare parts?

• Screw rotors are a key component in BEMA’s product range
• BEMA always assigns each screw rotor a unique item number, ensuring it can be reproduced identically
• With full control of its production basis, BEMA can reproduce screw rotors when they are worn out
• BEMA offers short delivery times for known screw rotors – typically 3–4 working weeks

What are the specific challenges for screw rotors handling biomass?

• Biomass is typically a highly abrasive material
• Hardox wear-resistant steel is often used for the screw flights
• In certain cases, it is necessary to apply hardfacing on screw rotors for biomass to ensure an acceptable service life

BEMA has many years of experience in manufacturing screw rotors used as spare parts in existing biomass conveying systems. We can advise on improvements that can be applied to a screw rotor to extend its service life.

Examples of measures that extend the service life of screw rotors for biomass

• Use of Hardox steel on the screw flights
• Application of hardfacing on selected areas of the screw rotor
• Adjustment of the pitch of the screw flights to avoid compression of the material

BEMA employs its own technicians and engineers to prepare production documentation for screw rotors.

BEMA’s technicians can perform the following tasks regarding screw rotors

• Advise on material selection for screw rotors
• Develop proposals for changes in manufacturing methods to extend service life
• Carry out design modifications to improve the screw rotor design

If you, as a customer, have a need for manufacturing screw rotors as spare parts, please contact us. We serve all types of industries.

Examples of industries served by BEMA with screw rotors

• Power plants
• Biogas plants
• Wastewater treatment plants
• Paper mills
• Raw material extraction companies
• Sugar factories
• Starch factories
• Slaughterhouses
• Offshore installations
• Mineral wool factories
• And many more

FAQ – Conical screw rotors for biomass

Why are conical screw rotors used for biomass?

Conical screw rotors ensure more uniform emptying of the hopper because they are continuously covered by material. The conical shape prevents blockages at the outlet and provides stable and efficient material transport in power plants and other biomass facilities.

What materials and wear resistance solutions can BEMA offer?

Biomass is a highly abrasive material, and therefore screw flights are often manufactured in Hardox wear-resistant steel. In particularly demanding operating conditions, hardfacing can be applied to significantly extend service life. BEMA advises on the optimal material combination for your specific installation.

Can screw rotors be manufactured as identical spare parts?

Yes. BEMA assigns each screw rotor a unique item number, allowing it to be reproduced 100% identically when worn out. With full control over the production basis, BEMA can deliver spare parts quickly — typically within 3–4 working weeks.

What improvements can extend the service life of a screw rotor?

Service life can be significantly extended through the use of Hardox, application of hardfacing on exposed areas, and adjustment of the pitch of the screw flights to avoid material compression. BEMA’s technicians can also propose design changes that optimize both operation and durability.