Wood Heat Options by Global Energy


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Lumber Dry Kiln Wood Heat Options

Dry Kiln Heat Options:

Some of the most economical heat options for a wood drying kiln include using wood residue, including sawdust, shavings, chips, and bulk wood.

Sasmo Pellet and Corn Burner

Sasmo Corn and Pellet Burner:

This unit burned waste seed corn into a vertical boiler. The low pressure steam was used in a double expansion steam engine to drive both a feed-pump (boiler water) and 2 kW generator.

Waterwide Solid Fuel Burner at Austral Ply in Brisbane Australia

Waterwide Solid Fuel Burner (Hastings, New Zealand):

The Waterwide unit was popular in the 1980’s and used all over the world for grain drying, wood/timber drying, and sawdust dryers. The company had a sales and licensing agreement to bring the technology into the USA by a company in Erie, PA called Skinner Engine Company, in 1989 to sell and distribute solid fuel burners in the USA (they lasted less than a year then cancelled those plans). I installed and sold several of these in Australia and the USA. In Australia, the larger units were used to direct fire plywood dryers in plywood mills. The thin laminates were lathed off a spinning log of Radiata Pine. The thin sheets of sweet smelling wood were then put through a direct fired continuous dryer. The sheets were then laminated together and pressed to make plywood. The thin off-cuts were shredded and the waste wood was stored in large bulk storage silos. The most costly part of the solid fuel system was the fuel handing and storage. The solid fuel burner worked great, with cyclonic combustion of the gas. The hot gas was filtered through high temperature low micron filters (called a baghouse). The hot gas then was mixed with ambient air to cool a bit, then routed to the dryers. In the USA, the model DF80 (3 million btu/hr rating) was the most popular.

Biomass Burner Wood Fired for Lumber Dry Kilns Used at Paxport Mills in Tacoma, Washington

Biomass Burner

Biomass Burner originally produced in Sterling, Colorado.

Stainless Steel Pipe for Lumber Dry Kiln Direct Fired Heat

Heat Pipe

The Furnace Type Kiln was originally tested out by the Forest Products Lab in 1945 in Madison, Wisconsin.

Furnace Type Kiln for Lumber and Firewood Drying Using Wood Wastes by the USDA Forest Products Lab

Furnace Type Lumber Dry Kiln 1945

From the USDA in 1945 (yes, you read right). We've tried these heat pipe kilns and they work great. In the more modern version, we used a Conifer sawdust burner to direct fire heat into a large diameter stainless steel pipe in the top section of the kiln, where the fans circulate the airflow over the pipe to heat the kiln. The fans always stay on (especially when the direct fire burner is operating).

The basic concept is to have the output of the biomass burner go directly into a heat pipe. Just think of a long horizontal steel chimney that heats the kiln.

You can also use propane or natural gas burners to do the same thing. All the gases are contained within the steel pipe, so it reduces the change of any flammability issues.

Furnace Type Lumber Dry Kiln (pdf)

CONTACT TEL: 608-238-6001 Email: greg@globalmicroturbine.com