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Capturing Clean Cellulose
Lyle Stephens
John Deere Technology Innovation Center
• State of the Art– Harvesting systems– Performance
• Issues
A Brief History
• Deere developed the “Biomass Converter” in the 1970s.
• Used the energy in corn cobs to dry the grain
• Produced syngas for heat and engine fuel.
Status Report
• The industry has developed a large number of harvesting technologies.
One Pass
Two Pass
Willow
Miscanthus
Forest Slash
Sponsored Harvest Research
• DOE – Iowa State University
• Cargill-Dow (now NatureWorks)
• John Deere Harvester Works
• John Deere Ottumwa Works
• John Deere Technology Center – Moline
• University of Wisconsin – Madison
• University of Kentucky
Generate and Evaluate Concepts
• One Pass – One Stream
• One Pass – Two Streams
• One Pass – Three Streams
One Pass – One Stream
• Increase bulk density of loaded truck
• Unthreshed ears mixed with chopped stalks – central processor for separation
One Pass – Two Streams
• Ears only into combine
• Whole plant into combine
Ears Only
Whole Plant
One Pass – Three Streams
Sugar
Cotton
Technology Portfolio
• Multitude of unit operations in current and past machines
• Can be combined into new machines to meet market requirements
Harvest System Performance
0
2
4
6
8
10
12
14
0 1 2 3 4
Tons per acre
Acr
es p
er h
ou
r
Research Issues:
• Soil health and soil erosion
• Nutrient value in biomass
• Harvest labor availability
• Highly seasonal supply
• “Hassle Factor”
• Feedstock specifications
• New Harvesting Concepts