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2.009 Blue Team A Dexter Ang, John Brewer, Kevin Chen, Greg Fonder, Danny Hilton, Matt Krueger, Andres Pino. Charcoal Briquettes Mockup Review. October 21, 2004. Key Challenges. Loading Hopper design Position of feedscrew Output nozzle Length Diameter. Emulating Bagasse, 1.

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Charcoal briquettes mockup review

2.009 Blue Team A

Dexter Ang, John Brewer, Kevin Chen, Greg Fonder, Danny Hilton, Matt Krueger, Andres Pino

Charcoal BriquettesMockup Review

October 21, 2004


Key challenges
Key Challenges

Loading

Hopper design

Position of feedscrew

Output nozzle

Length

Diameter


Emulating bagasse 1
Emulating Bagasse, 1

  • Raw bagasse not yet available (harvesting now)

  • Instead, crushed charcoal briquettes to emulate carbonized bagasse


Emulating bagasse 2
Emulating Bagasse, 2

  • Crushed charcoal then sifted to remove larger pieces


Mixing
Mixing

  • Crushed/sifted charcoal mixed with tapioca binder to form extrudable mixture


Extrusion with meat grinder
Extrusion with Meat Grinder

  • Used 3/4” diameter output nozzle

  • Good briquettes, but poor loading from hopper


Benefits of extrusion
Benefits of Extrusion

  • Average density of 0.95 g/mL (extruded), compared to 0.48 g/mL (hand-formed)


Concept mockup
Concept Mockup

  • Utilizes 2” OD earth auger bit

  • Designed to test configuration of hopper


Improved hopper design
Improved Hopper Design

  • Feedscrew loads from all directions, not just from above

  • Continuous feed without additional input


Playing with nozzles
Playing with Nozzles

First used short barrel (2” diameter) that tapered to a 3/4” diameter nozzle

Generated large thrust forces

Too much for our thrust bearing

Then used longer barrel without any taper (2” diameter)

Produced fairly good briquettes


Conclusions further work
Conclusions / Further Work

Meat grinder proved viability of extrusion, revealed issue with loading

Concept mockup validated an improved hopper/feedscrew interface

Further work needed to improve thrust bearing, optimize nozzle