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A two-layer porous (fine and coarse) burner consisting of radiation corridors (finned rods) and an external preheater is numerically analyzed. The porous burner holds the flame and heats the finned rods effectively conducting heat to radiating disks downstream, while the sensible energy of the flue gas is recovered before exiting the burner by a preheater carrying a secondary air that mixes upstream...
The current efficiency of monolithic (including two-layer) radiant porous burners is less than 25% and here we introduce a novel structure for effective preheating and radiation routing to increase the efficiency. This recovers the flue gas heat to increase the inlet air temperature and raises the flame temperature locally above the adiabatic temperature (superadiabatic flame) for the fuel-lean conditions...
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