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Gasifier and Biochar Fuels and F eedstocks

Gasifier and Biochar Fuels and F eedstocks. Selection. Wood/bamboo Chips Sticks Sawdust Shells/pods/nuts/seeds Citrus peels. Processing. Chopping, chipping, breaking, grinding Sifting/sorting/sizing pelletizing. Drying. Sun drying Solar drying Flue gas drying Hot air drying.

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Gasifier and Biochar Fuels and F eedstocks

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  1. Gasifier and BiocharFuels and Feedstocks

  2. Selection • Wood/bamboo • Chips • Sticks • Sawdust • Shells/pods/nuts/seeds • Citrus peels

  3. Processing • Chopping, chipping, breaking, grinding • Sifting/sorting/sizing • pelletizing

  4. Drying • Sun drying • Solar drying • Flue gas drying • Hot air drying

  5. Sun/Air drying • Direct drying on surfaces in direct sunlight • Disadvantages • Slower • Prone to rain and dew rewetting unless covered • More labor intensive • Advantages • Cheap

  6. Solar drying Drying with sun in enclosed/covered apparatus Advantages faster less labor protection from rewetting Disadvantages more expensive more complicated

  7. Simple solar tent dryer2x6 frame, ½ hardware cloth bottom, 2x3, 2x4 frame greenhouse plastic tent top

  8. Flue gas dryer • Pass the hot combustion gasses directly through the wet fuel • Advantages • Simpler than indirect • Cheaper than indirect • Disadvantages • Requires high heat materials • Risk of ignition

  9. Flue gas dryers • Rotary drum of expanded/perforated steel • Trays/drawers in frame • Multi level “fountain” in steel drum

  10. Indirect (heat exchanger) dryers • Counterflow air heater • Shell and tube air heater blow hot air into: stacked trays Rotary drum

  11. Storage • Dry • Ventilated • Protected from rain • Containers off the ground

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