Model of multicomponent droplet evaporation with liquid phase reactions.

摘要

Research on the dynamics of fuel droplets is of fundamental interest to energy and combustion science. Petroleum plays a significant role in supply the world energy. Since these fuel oils are usually introduced into the combustor as sprays of droplets, it is reasonable to investigate individual droplets which would intimately influence the bulk spray vaporization characteristics, which in turn determines the combustor performance. As interest grows in the use of heavier, synthetic fuels for combustion processes, researchers must re-examine the fuel droplet vaporization problem, both because lower rates of evaporation may pose design problems, and also may lead to greater emissions of unburned coke from combustors. These processes are of interest in connection with the pyrolysis of softening coals. It is experimentally observed that most softening coals exhibit liquid-like behavior during the pyrolysis process, especially under elevated temperature conditions (i.e., 650K and above). The fluidity and plasticity characteristics of softening coals lead us to consider and analogy between liquid fuel droplet combustion and softening coals at elevated temperatures. The present study discusses of pyrolysis of softening bituminous coal particles, and evaporating, coking, heavy oil droplets. A mathematical model for multicomponent droplet evaporation. With consideration of liquid phase reactions is presented. The model is applicable to coal particles undergoing a pyrolysis process which exhibit liquid-like behavior at elevated temperatures. 96 refs., 71 figs., 7 tabs. (ERA citation 15:033886)