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Methane Digester

Methane Digester. Joe Clough Design Review. Background Designs. Above: 50 gal. Digester unit, less than 100 cow dairy farm. Above: Large Scale Digester used for above 100 cow dairy farm. Problem Statement.

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Methane Digester

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  1. Methane Digester Joe Clough Design Review

  2. Background Designs Above: 50 gal. Digester unit, less than 100 cow dairy farm. Above: Large Scale Digester used for above 100 cow dairy farm

  3. Problem Statement • Design and fabricate a small scale digester agitation system that can effectively agitate manure slurry when controlled by temperature.

  4. Systems • Digester Systems: • Heating • Agitation • Methane Collection • Feeding Slurry

  5. System Diagram

  6. Mechanical Design Elements • 55 Gal. Drum (exterior container) • 35 Gal. Drum (interior container) • Motor Mount • Mixing Auger • Motor Linkage • Drive Train

  7. Electrical Design Elements • Motor • Programmable Logic Controller • Temperature Sensors • Pressure Sensors

  8. Control Systems • How it works: • Temperature below 101F, Motor turns on; Heating System turns on • Temperature above 101 F, Motor turns on; Heating system off • Temperature at 101 F, Motor is off, Heating system off

  9. Controls Logic State Start up 0 0 Temp < 101F 0 0 Temp == 101F Heating Temp > 101F Wait 1 1 Temp > 101F 0 0 Cooling Temp < 101F Temp > 101F 1 0

  10. Budget • Motor (1/4 hp) $150 • Steel $100 • Temperature Sensors $100 • Pressure Sensor $65 • PLC$60 • Total $475

  11. Tentative Schedule • After break: Final Design finished • End of January: Motor testing • February: Motor testing with Temp. • March: PLC coding finished and Mechanical fabrication • Early April: Finish Fabrication, test runs

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