Effects of carbon-black properties on combustion of carbon-black slurry agglomerates

✍ Scribed by G.A. Szekely Jr.; S.R. Turns; G.M. Faeth

• Publisher: Elsevier Science
• Year: 1984
• Tongue: English
• Weight: 803 KB
• Volume: 58
• Category: Article
• ISSN: 0010-2180
• DOI: 10.1016/0010-2180(84)90076-2

✦ Synopsis

This investigation considers the reaction of carbon-black agglomerates which are formed during the combustion of carbon-black slurry fuels. A monodisperse stream of agglomerates (75 ~m initial diameter) was observed in the postflame region of a flat-flame burner, operating at atmospheric pressure. Measurements yielded agglomerate mass, size, temperature, and velocity as a function of time in the burner gases. Monodisperse carbon blacks having ultimate carbon-black particle sizes of 70-300 nm and a blend having 50 % mass loading (each) of 70 and 300 nm blacks were tested. The rate of combustion of monodisperse blacks increased slightly as the ultimate carbon-black particle size was reduced. The burning rate of the carbon-black blend, however, was lower than the monodisperse blacks--yielding residence times for reaction that were 10~-50% longer at comparable conditions. It was found that the present measurements could be correlated using a variable-density, shrinking-sphere model of the process, with empirical parameters representing effects of subsurface structure of the agglomerates.