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Case Study: De-Stoner for Cleaning Wood in a Pelletizing System

Challenge:
Prior to the installation of a wood preparation system ahead of a pelletizing unit, GKC conducted testing to show how the De-Stoner air classifier could be used to remove unwanted heavy material (Rocks). Because this testing indicated that only a small amount of rock was present and some other type of classifier was proposed as an option for the shredder, the De-Stoner was not purchased with the initial system. The De-Stoner-less system was put in and excessive wear is being experienced on both the shredder and cyclone. Too many Rocks remain with the wood. Customer again contacted GKC to reconfirm that most of this relatively small amount of rock could be removed from wood waste feeding the system.

Approach:
To prove that the De-Stoner would remove these unwanted rocks, several super sacks of waste wood material from two sites was sent to GK’s Testing Lab. The single Knife De-Stoner with up front sizing screen was used to demonstrate the unit’s effectiveness.

Solution:
As soon as the results were reviewed and accepted, scale up was done and proposals presented for both sites. These proposed units were both dual knife type De-Stoners with feed end sizing screens. The upfront sizing screens allows for adjusting each knife section for the specific size of material being handled. One unit also incorporated a scalping section for removing over size material.

Results:
The De-Stoner allowed the customer to reduce wear and maintenance on their shredder and cyclone, while increase throughput due to increased uptime.

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