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Small-scale Combustion

Small-scale Combustion. Betty Bui ME 258 Fall 2012. Introduction. Lithium versus Hydrocarbons. Small-scale Combustions. Advantages More efficient Reduce waste and emissions (CO and NOx) Disadvantages Manufacturing Properties not linear Heat recirculation Heat loss

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Small-scale Combustion

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  1. Small-scale Combustion Betty Bui ME 258 Fall 2012

  2. Introduction • Lithium versus Hydrocarbons

  3. Small-scale Combustions • Advantages • More efficient • Reduce waste and emissions (CO and NOx) • Disadvantages • Manufacturing • Properties not linear • Heat recirculation • Heat loss • Pollutant formation

  4. Categories

  5. Timeline of Development • 1998: Waitz – 1st micro-combustor of 0.13cm3 • 2002: Weinberg – Swiss Roll Combustor • 2002: Sirignano – Liquid fuel flow directly on walls • 2003: Liedtke and Schultz – Liquid film in annulus around tube • 2004: Kaiser and Kyritsis – Meso-scale catalytic combustor via electrostatic spray • 2004: Wang – Swirl-stabilization combustion • 2005: Anh - Gas-phase and catalytic combustion in Swiss-Roll • 2005: Spadaccinni – Hybrid micro-combustor • 2005: Yuasa – Flat-flame micro-combustor • 2006: Marbach and Agrawal –Porous inert material

  6. Approaches • Excess Enthalpy • Regenerative preheating • Redistribute thermal energy • Minimizing heat losses • Heat Exchanger • Counter-flow current • Heat Transfer • Convection • Radiation

  7. Swiss Roll Combustor (SRC) • Combustion Chamber • Pair of long channels

  8. Porous Inert Media (PIM) • Two concentric cylinders • Preheated reactants in annulus prior to PIM

  9. Conclusion • Swiss-roll combustor and Porous Inert Media • Excess Enthalpy • Regenerative Reheating • Heat transfer modes • Leaner combustion • Reduced emissions

  10. Questions? The end…

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