Effect of Sodium Bicarbonate on the burning velocity of Premixed Turbulent Iron-Methane Air Flames

摘要

Fires and explosions are a major cause of property damage and injuries around the world. The rapid injection of sodium bicarbonate solid particles is one of the techniques used to suppress or prevent the propagation of explosions in industrial facilities. The current study investigates the effect of sodium bicarbonate on the laminar and turbulent burning velocities of hybrid fuel mixtures which combine gas phase and solid phase fuels using a steady state Bunsen burner style apparatus. The hybrid flame in this work has a methane-air gas phase equivalence ratio of one and iron dust concentrations ranging from 25 g/m~3 to 100 g/m~3. Sodium bicarbonate concentrations added to the hybrid flame range from 25-75 g/m~3. Turbulent intensities range from 0.65 m/s to 0.72 m/s. When the sodium bicarbonate enters the flame zone it acts as both a heat sink and a source of carbon dioxide and water. At the higher concentrations of sodium bicarbonate both reduction in the burning velocity and extinguishment of the hybrid flame is seen over a range of turbulent intensities.