Abstract
The droplet heat and mass transfer processes are important for liquid spraying technologies, which were investigated when applying the theoretical and numerical modelling and experimental methods. In this work, results of experimental research on the heating of water droplets in purified biofuel flue gas were presented and analyzed. In experimental investigation, the purified biofuel flue gas is replaced by additionally humidified airflow. The experiment methods and results processing are discussed and provided. Impact of air heating and additional humidification was estimated. While heating and additionally humidifying the air flow was focused on boundary conditions in condense economizers, when the flue gas temperature is 20-100°C and water vapor volume fraction is 0-0.2.
Highlights
Fossil fuel resources are still sufficient to meet the modern energy needs of mankind [1]
The hydrodynamics regimes of gas flow and droplet overflow are determined by Reynolds numbers respectively: Re g
The experiment was performed for the regularities definition of water droplet thermal state variation in humid air flow as well for verification of theoretical conclusions presented in work [34]
Summary
Fossil fuel resources are still sufficient to meet the modern energy needs of mankind [1]. When the water is sprayed into biofuel furnace flue gas, the droplets must completely evaporate This allows to use the traditional ferrousmetal-based heat exchangers for cooling flue gas and does not create favorable conditions for wall corrosion. The flue gas is cooled to temperature of 40°C and during condensation process water vapour volume fraction decreases to 0.07 in average. The application of a numerical modelling is perspective, but experimental research results that required for control are insufficient, in cases of transient phase changes of water droplets in humid flue gas flow. It should be noted that the experimental investigations are needed to control numerical models results is still insufficient in transient regimes of complex transfer processes, especially in water vapour condensation regime on a droplet surface. The water vapour condensation and water transient evaporation regimes are important for defining the optimal water spraying in biofuel combustion technologies
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