Burner construction in marathon
®
gas burners
dreizler A 3001 E - 18.12.2015 | A 2036 - 1.09 | EN - 23.06.2009
19
4.2
The marathon
®
burner system
Combustion air flow is controlled on the high-pressure side with multi-step control via a simple air throttling
damper (manual damper) in the blow-out duct of the fan housing. The combustion air flowing through the
mixing manifold 'breaks' on the circular circumferential edges of the hollow burner head rings, creating dy-
namic pressure upstream and two stationary low pressure rotations downstream at the burner head rings,
which represent so-called tubular torus swirls.
The combustion gas is fed from the gas ramp in the first torus swirl via the hollow burner head. The gas
radially enters the first low pressure buffer zone via numerous bores; due to this low pressure, the gas is
practically sucked from the burner head rings. The lack of retaining bridges in the area of the gas emission
contributes significantly to burner safety. The gas flow - entering crosswise - is captured by the first torus
swirl and then mixed with fan air at its outer limits.
The second buffer zone therefore becomes the gas/air diffusion zone, which immediately initiates a com-
bustion air reaction when ignition range has been reached in the gas/air concentration.
NOTICE:
Boilers with reverse combustion chambers or a low boiler door (excess flame tube length) may require a
longer flame tube in order to guarantee a clean mixture.
A relevant technical verification must be carried out during the project planning phase. A retrofit on-site is
however possible at any time.