Making green timber lighter could save millions of dollars

Making green timber lighter could save millions of dollars

Green wood is about 50 per cent water, but new desktop planning tools and a smartphone app will help managers balance the reduced transport costs from drying forest biomass and timber infield against product quality, storage costs and machinery wear and tear. 

Researchers on a project funded by FWPA and managed by the University of the Sunshine Coast’s Forest Industry Research Centre (FIRC) say the new tools could save the forestry industry millions of dollars.

Given that green wood contains so much moisture, substantial transport cost savings are achievable through infield log drying. 

Professor Mark Brown, director of FIRC, said: “With more than 25 million tonnes of predominantly green logs and chips transported in Australia per year at a cost of over $350 million, potential annual savings of millions of dollars in annual land transport costs are possible, even for relatively small reductions (less than 10 per cent) in moisture content.

“The initial phase of our research into infield log drying found that summer drying rates of more than one per cent moisture content per day were possible in the first week of storage.”

A literature review showed that use of post-harvest forest biomass for domestic energy use and for export is common overseas but is a largely untapped resource in Australia, and will continue to be so unless delivered costs can be reduced.

“High harvest and transport costs are a critical barrier to increased forest biomass use, and integration of forest biomass harvesting with conventional forest harvesting has been shown to be an efficient option,” Professor Brown said. 

“Biomass and logs for chips and other wood products can then be dried infield to reduce transport costs - and for biomass, increase its energy content.”

Professor Brown explained that infield drying of chip logs and higher-value logs can lead to deterioration in quality and additional processing machinery wear and tear, however, little was known about the magnitude of these issues and at what moisture content they become significant. 

The FIRC project included infield drying trials of biomass, chip-logs and higher-value wood products, as well as chipper time and motion studies, with variables such as location, season, species and pile size.

Field trial results were then used to create drying models and software tools and this was followed by operational trials conducted with industry collaborators. 

The predictive tools developed through this research will enable forest growers to make informed decisions regarding infield storage of logs and biomass so they can reduce moisture content to the point where returns from lower transport costs outweigh any losses from reduced quality, increased storage costs and increased machinery wear and tear. 

FIRC focuses on issues as they relate to the forestry value chain and interact to affect the economic and environmental sustainability of forest industries.

The forestry value chain covers a wide range of research disciplines including genetics and genomics, silviculture and stand management, forest health and pest management, ecology and biodiversity management, timber and biomass harvest and haulage, fibre quality and value, timber processing and bio-refinery, renewable energy and biofuels as well as timber construction materials.

This project will be completed shortly, so watch this space for a further update.

Background: 

M. Strandgard, P. Turner, L. Mirowski & M. Acuna (2019).  
Potential application of overseas forest biomass supply chain experience to reduce costs in emerging Australian forest biomass supply chains – a literature review. Australian Forestry.

 

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