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Residue Recovery, Transport, Densification, and Storage Economics, Activity 2 Item Info

Chunkwood is a unique product that has been under development for several years in the United States and the Scandanavian countries. Chunks vary in size with the diameter of the piece being processed and can be manufactured to depths of 2.5 to 4.5 inches. The larger chunks allow air flow through the stored wood, decreasing the chances of spontaneous combustion and increasing the amount of drying while in storage. Increased combustion efficiency could also occur in wood burning units designed to handle larger chunks of wood. The product can be produced in the woods with equipment similar to whole tree chippers. Keeping the material in a chunk form also retains options for the production of products other than energy. An experimental prototype of a chunkwood processor was used to process logging residue and whole trees from thinning and clearcut operations. Three general methods were used to move the material from the woods to the processing point. Residue left after commercial timber harvest was moved to the roadside in a modified dozer piling operation. Earlier studies had suggested this as an efficient way to move the non-uniform residue material to an accessible point for processing. A second operation used a mechanical feller-buncher to cut and bunch trees from a dense, stagnant timber stand. Trees were skidded to the wood chunker with a grapple skidder. The third operation involved recovery of trees cut in a thinning operation. Trees were prebunched with a farm tractor and winch and skidded to decks at roadside with a wheeled skidder. The chunkwood processor recovered and processed material directly from the roadside decks. Objectives of the project included documentation of the production, problems, and costs associated with delivery and processing of chunkwood in these recovery operations.

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Title:
Residue Recovery, Transport, Densification, and Storage Economics, Activity 2
Creator:
Johnson, Leonard R.; Lee, Harry W.; Hughes, Michael
Date Created:
1989-07-10
Description:
Chunkwood is a unique product that has been under development for several years in the United States and the Scandanavian countries. Chunks vary in size with the diameter of the piece being processed and can be manufactured to depths of 2.5 to 4.5 inches. The larger chunks allow air flow through the stored wood, decreasing the chances of spontaneous combustion and increasing the amount of drying while in storage. Increased combustion efficiency could also occur in wood burning units designed to handle larger chunks of wood. The product can be produced in the woods with equipment similar to whole tree chippers. Keeping the material in a chunk form also retains options for the production of products other than energy. An experimental prototype of a chunkwood processor was used to process logging residue and whole trees from thinning and clearcut operations. Three general methods were used to move the material from the woods to the processing point. Residue left after commercial timber harvest was moved to the roadside in a modified dozer piling operation. Earlier studies had suggested this as an efficient way to move the non-uniform residue material to an accessible point for processing. A second operation used a mechanical feller-buncher to cut and bunch trees from a dense, stagnant timber stand. Trees were skidded to the wood chunker with a grapple skidder. The third operation involved recovery of trees cut in a thinning operation. Trees were prebunched with a farm tractor and winch and skidded to decks at roadside with a wheeled skidder. The chunkwood processor recovered and processed material directly from the roadside decks. Objectives of the project included documentation of the production, problems, and costs associated with delivery and processing of chunkwood in these recovery operations.
Document Type:
Research Article
Library Call Number:
IDAHO SD544.J657 1989
Subjects:
residue recovery chunkwood chunkwood processor forest products
Location:
UIEF
Latitude:
46.869607
Longitude:
-116.733856
Department:
Department of Forest Products
Type:
text
Format:
application/pdf

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Preferred Citation:
"Residue Recovery, Transport, Densification, and Storage Economics, Activity 2", UIEF Research Exchange, University of Idaho Library Digital Collections, https://www.lib.uidaho.edu/digital/uief/items/uief_0084.html
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