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Interaction between a hollow‐cone spray and the co‐axial swirling stratified flow in a novel spray pyrolysis furnace
Author(s) -
Du Wei,
Sun Ze,
Lu Guimin,
Yu Jianguo
Publication year - 2018
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.23047
Subject(s) - spray characteristics , nozzle , materials science , mechanics , volumetric flow rate , spray nozzle , flow (mathematics) , inlet , mass flow rate , residence time distribution , residence time (fluid dynamics) , ligand cone angle , mass flow , mechanical engineering , composite material , conical surface , engineering , physics , geotechnical engineering
Pressure‐swirl nozzles producing hollow‐cone sprays are widely used in many engineering applications, but the induced high‐speed stream along the centreline of the spray cone was ignored in designing spray chambers. The high‐speed stream influences the flow field especially in minimized spray chambers, but it is difficult to characterize experimentally. Hence, computational fluid dynamics was applied to investigate the multi‐phase flow interactions inside a novel spray pyrolysis furnace for liquid ore exploitation. The mass flow rate distribution of the co‐axial swirling stratified flow inside the furnace, the gas‐solid separation efficiency, particle size distribution, and residence time were investigated under different positions and directions of the hollow‐cone spray. The results proved that different spray operations would cause variation in the air mass flow rate distribution and gas‐solid separation efficiency, which should be paid attention to in the design of process intensification. The distribution of particles sized from 30 to 40 μm were most sensitive under different flow rates. The recommended operating conditions of the spray pyrolysis process were confirmed as the inlet velocity of 5 m/s and downward spray from the top of the furnace chamber.