Open AccessDESIGN OF ATOMIZERS AND BURNERS FOR COAL-WATER SLURRY COMBUSTION
Author(s) -
Rony Hitron,
William Humphrey,
Norman Chigier
Publication year - 1998
Language(s) - English
Resource type - Reports
DOI - 10.2172/781753
Subject(s) - pressure drop , airflow , chemistry , analytical chemistry (journal) , coal water , concentric , combustion , polymer , volumetric flow rate , mechanics , materials science , meteorology , mineralogy , chromatography , thermodynamics , composite material , physics , mathematics , organic chemistry , geometry
A detailed compressible airflow analysis was performed on the central air passage of the triple-concentric atomizer. The results show that a minimum mass flow rate of 0.33 g/s ({approx}16 L/min at STP) of air at a supply pressure of 296 kPa(absolute) is required to create a sonic flow at the atomizer exit, which is 0.97 mm in diameter. This result confirms the hypothesis that previous parametric visualization studies of the spray cone did not have sonic air flow in all cases. Additionally, Phase/Doppler droplet size and velocity measurements were made in sprays of both water and a dilute solution (0.05% wt/wt) of high-molecular weight polyacrylamide. The measurements show small increases in mean drop size when the polymer is added to the liquid, which are nevertheless large compared to the percentage of polymer solute in the solution