Low-Emission, Fuel-Flexible Combustion of Liquid Fuels - Novel Combustion Concepts for Sustainable Energy Development - page 465

Fig. 13 Flame images at
10 % AA for a Diesel, b VO,
c 70-30 diesel-VO,
d Biodiesel

rate. Straight VO operated well under several conditions, and we were able to
combust it cleanly without preheating or using other methods to modify the fuel
properties and/or atomization characteristics.

7 Glycerol Combustion

FB injector was used to combust straight glycerol having extremely high kinematic
viscosity as shown in Table 1 . Glycerol also has a high ignition temperature. Thus,
a glycerol ame

is not available to preheat the incoming fuel stream (Metzger 2007 ). One potentially
dangerous aspect of glycerol combustion is the production of acrolein. Acrolein is
an extremely toxic compound at low levels (approximately 2 ppm) and is produced
during decomposition of glycerol (Metzger 2007 ). Thus, the combustion system
must oxidize decomposed species and ensure complete combustion. Preliminary
experiments revealed a rather weak glycerol

fl flame can easily extinguish if suf cient thermal feedback from the fl

fl flame for combustion air at ambient