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Wood Pelleting Process

• Dry wood (8-10%) to the hammermill
• Feed stock size not to exceed 1-3/16”x1-3/16”x3/8”
• Conditioner after hammermill for moisture addition
• Retention bin with at least 20 minute capacity
• Moisture meter after retention bin
• VFD Feeder for PM Conditioner
• Conditioner
• Pellet Mill
• Cooler
• Screener

Horizontal Flow

Water addition after hammermill

• Add water so it can soak
• Create homogeneous moisture in each particle, especially after dryer
• Controlled flow from hammermill
• Conditioner model LL or LT for larger capacities

Moisture measured at inlet of ripening bin with online moisture analyzer

Stable moisture for stable process conditions

• Optimizes pellet quality
• Minimizes energy usage
• Provides longer die and roller life

Ripening at retention vessel

Mixing bin or vertical bin:

•  Variations in moisture

•  Variations in product type

Vertical bin:

• First in first out
• Larger volume, longer retention time

Mixing bin:

• Homogenizes the raw material
• Limited retention time

Equipment Selection

    Hammermills

• When selecting a hammermill for wood grinding it is important to use the correct constant based on the size of incoming material.

Grinding Constants

Hard & soft wood 8-12% moisture

Hammermill screens

PELLETS

¼”– 5/16”

SCREEN HOLE

16/64th – 20/64th

Ancillary equipment for hammermill

VFD Screw Feeder

Air Siphon Feeder

Air Assist package Alt II style III filter

Pelleting

pellet mills

• with 400 Hp.
• Capacity 4 – 5 t/h

Heavy Duty Low Speed Gearing

Gear Box

Shear Pin Protection

Standard features on wood pellet mills

• Closed End Corrugated Roller Assemblies with Spherical Bearings.
• Bear Claw Die Clamp
• Doors set-up with ability to use four knife post

–  If pellet length is an issue, cutter bars can be added

• Air Actuated Feed Chute
• Forced Lubrication
• Auto Lube system
• 18INF6.5 Conditioner at 300 rpm

Technical details

Grease lubrication for rollers

Conditioner model 18INF6.5

• Shaft speed 300 rpm optimum speed giving minimum pulsing
• Spider fitted at conditioner outlet to reduce pulsing

Infusion Conditioner

• Right Hand Access Doors
• Inlet Magnet & Housing for Conditioner
• Short Retention Inlet Drive with stainless steel clad shaft
• Shaft Mounted Gear Reducer, 7.5 Hp. 300 RPM, shaft speed
• Base Frame for 7930 Pellet Mill

COOLING WOOD PELLETS

Remove heat and moisture to acquire:

• Dry pellets with hardness and strength

this provides:

• Transport ability
• Storage ability

hot & moist pellets 180-230°F

Pelletmill Controls

Automation is available to control all of the pelleting process.