Maxflame Dual Fuel Hot Air Burners

SERIES 6821

6821 HOT AIR MAXFLAME DUAL FUEL BURNERS are designed with the heat
release range of 1 to 10 million Kcal/hr and can be used for the application such as steel reheat, aluminium melting,
process heaters, and other high temperature applications upto the temperature of 1400 C. MaxFLame Dual Fuel Burners
operate with hot combustion air upto 650 C from Recuperator or other heat recovery devices to save energy. Normal
capacities are rated at 525 C air at a pressure of 25 mbar.

CONSTRUCTION Bodies are fabricated heavygauge carbon steel and
lined with ceramic fiber and the stabilizing disc is faced with high alumina refractory.

FUEL Gas with 4000 Kcal/m or higher calorific values can be used
with this burner. Light/Heavy Oil both can be used.

OPERATION Gas flames are stable in cold, tight combustion chambers
with ambient or high temperature combustion air. Under these conditions, the flame is semi-luminious. For stoichiometric
firing, required natural gas pressure is approximately 60% of the air pressure when firing at maximum capacity on cold
air. Gas pressure requirement will be less when firing with hot combustion air. Atomizing Air at 15 mbar must be used
when firing with gas. MaxFlame Burners use 5654 low pressure (cold) air atomizers that require 125-mbar air pressure.
Heavy oil must be heated to reduce viscosity to100 SSU. Stoichiometric operation requires less than 275 mbar oil
pressure at the nozzle.

FLAME SUPERVISION UV detectors and flame rods are preferrd

IGNITION If a pilot is used, it must be interrupted within 10
seconds after main burner ignition. Direct Spark Ignitors can also be used for ignition. Torch Lighting of MaxFlame
Burners is not recommended, due to the high tile pressures.

CONTROL The burner can be lighted with maximum main air pressure
of 25 mbar and turndown to 5mbar. Due to the hot air stoic gas pressure of approximately 0.6 (or less) X air pressure,
either a cross-connected regulator system or electronic mass flow control system can be used.

Burner Diagram


TABLE 1: AIR CAPACITIES/ CHARACTERISTICS


MODEL
525°C AIR AT
25 MBAR
P
15°C AIR AT
25 MBAR
P
ATOMIZER
MODEL
FLAME LENGTH,
MM AT
525°C
MAX OIL
CAPACITY
LPH
ATOMIZING AIR,
m³/hr AT
125 MBAR		 FLAME
LENGTH, m

MAXFLAME 6821-10A-54		 1133 1898 5654-4 1676 160 170 1.5 1.5

MAXFLAME 6821-10-54		 1501 2521 5654-4 2134 160 170 2 2.5

MAXFLAME 6821-12-54		 2210 3683 5654-5 2743 270 300 2.5 3

MAXFLAME 6821-14-54		 3003 5014 5654-6 3048 454 560 3 3.5

MAXFLAME 6821-16-54		 3796 6374 5654-6 3962 454 560 4 4.5

MAXFLAME 6821-18-54		 4873 8159 5654-7 4877 900 820 4.5 5.5

MAXFLAME 6821-20-54		 6091 10198 5654-7 5182 900 820 5 6

MAXFLAME 6821-22-54		 7365 12337 5654-7 6096 900 820 6 7


TABLE 2. DIMENSIONS IN (MM)


MODEL
A
B
C
D
E
(S)
F
(T)
H
(AA)
J
(EE)
APPROX
WEIGHT
KG
PILOT
MODEL

MAXFLAME 6821-10A-54		 250 65 50 10 200 475 950 400 155 4012-2 T

MAXFLAME 6821-10-54		 250 65 50 10 225 525 1050 450 160 4012-2 T

MAXFLAME 6821-12-54		 300 80 65 10 240 550 1150 500 185 4014-3 AT

MAXFLAME 6821-14-54		 350 100 80 10 265 600 1250 550 200 4014-3 AT

MAXFLAME 6821-16-54		 400 100 80 10 300 675 1300 600 220 4014-3 AT

MAXFLAME 6821-18-54		 450 100 100 15 325 750 1450 650 254 4014-3 BT

MAXFLAME 6821-20-54		 500 150 100 15 350 800 1500 700 295 4014-3 BT

MAXFLAME 6821-22-54		 550 150 100 15 375 850 1560 750 350 4014-3 BT

*Air inlets of
burners are in BSP thread

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