Gasifier and Biochar Fuels and Feedstocks Selection Woodbamboo
Gasifier and Biochar Fuels and Feedstocks
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
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
Solar drying Drying with sun in enclosed/covered apparatus Advantages faster less labor protection from rewetting Disadvantages more expensive more complicated
Simple solar tent dryer 2 x 6 frame, ½ hardware cloth bottom, 2 x 3, 2 x 4 frame greenhouse plastic tent top
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
Flue gas dryers • Rotary drum of expanded/perforated steel • Trays/drawers in frame • Multi level “fountain” in steel drum
Indirect (heat exchanger) dryers • Counterflow air heater • Shell and tube air heater blow hot air into: stacked trays Rotary drum
Storage • • Dry Ventilated Protected from rain Containers off the ground
- Slides: 11