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FPST 1213

FPST 1213. Chemistry & Physics of Fire. Modified from a presentation developed by Thomas Woodford. The Basics. Heat Transfer Conduction Convection Radiation. Combustion/Fire . Combustion indicates control Internal Combustion Engine Fire is rapid combustion, often uncontrolled

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FPST 1213

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  1. FPST 1213 Chemistry & Physics of Fire Modified from a presentation developed by Thomas Woodford

  2. The Basics • Heat Transfer • Conduction • Convection • Radiation

  3. Combustion/Fire • Combustion indicates control • Internal Combustion Engine • Fire is rapid combustion, often uncontrolled • Wildfires • House Fire • Camp Fire

  4. The Fire Tetrahedron • Oxidizer • Fuel (Reducing Agent) • Heat • Chemical Chain Reaction

  5. Chemistry of Fire • Propane: C3H8 + 5O2 3CO2 + 4H2O plus heat + light Heat of Combustion more energy stored in C3H8 then CO2 and H2O

  6. If we give the propane-air mixture a push (ignition source) • One molecule oxidizes giving off heat • This heat gives the push to other propane molecules • Away it goes

  7. Two types of flames • Premixed • Bunsen Burner • Diffusion • Candle flame

  8. Pre-Mixed Flames • Fuel and Oxidizer together • Flame has a characteristic velocity • If gas mixture flows at this velocity the flame appears to stay in place • Velocity too high – Blows out • Velocity too low – Flashes back

  9. Diffusion Flame • Fuel on one side • Oxidizer on the other • Flame is the reaction zone

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