ITAS Air Staging Forced Draft Gas Burner mod. RF-FDG · 2018-11-02 · ITAS Air Staging Forced Draft Gas Burner mod. RF-FDG earth air water fire burner main dimensions1 1 Dimensions

ITAS Air Staging Forced Draft GasBurner mod. RF-FDG

earth waterair fire

burner main dimensions1

1 Dimensions in case of order can be changed to suit design data. Dimensions are valid for ambient airtemperature up to preheated air at 250°C and 100 mm WC air pressure.

Air staging forced draft gas burner

BurnerSize MW

DIMA (dia.)

DIMB

DIMC

DIMD

DIME

DIMF

DIMG

0,5 600 700 600 350 400 300 3000,8 600 700 600 350 400 300 3001,2 700 800 700 450 500 300 3001,8 700 800 700 450 500 300 3002,6 700 800 700 450 500 300 3003,8 800 900 800 500 600 300 3005,7 800 900 800 500 600 300 3008,8 800 1000 900 550 650 350 300

E/P/B/RF-FDG

/01 12/0

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E-Mail: [email protected]




Air Staged combustion is an effective technique forlowering NOx. Staging means that some of theoxidizer is added downstream of the main combu-stion zone. In air staging, some of the combustionair is directed into the primary combustion zone,while the balance is directed into secondary andeven tertiary zones in some cases.This makes the primary zone fuel–rich, which isless conductive to NOx formation when makesprimary zone fuel-pared to stoichiometric condi-t ions. The unburned combustibles from theprimary zone are then combusted in secondaryand tertiary zones. While the overall stoichiometrymay be the same as in a conventional burner,the peak flame temperature is much lower in thestaged air case, because the combustion processis staged over some distance, while heat is simul-taneously being released from the flame.The lower temperatures in the staged air flamehelp reduce the NOx emissions. To be even closerto the needs of the customer, ITAS requires modifi-cations to general standards. Air staging burnersare available in the capacity range from 0,5 up to 9MW. NOx emission is below 160 mg/Nm3 for anyoperating condition.

Draught is a measure of the energy available todrive the combustion air through the burner andmix it with the fuel.In forced draught burners an applied energysource like a fan, is used to supply combustion airat pressures much higher then atmospheric. Thisallows greater energy to be used in mixing thecombustion air with the fuel, more intense combu-stion is achieved, and generally smaller flames. ITAS has a range of Forced Draught Burners usingthis technique. In the event that waste energy fromthe discharged gases or elsewhere is used to pre-heat the combustion air, this is accommodatedwithin our forced draught burner range.

Draught


BURNER SIZING CURVES

10

100

0,1 1 10

Burner Liberation - MW

DraughtLossmm. w.g.

SIZE 0,5

SIZE 0,8

SIZE 1,2

SIZE 1,8

SIZE 2,6

SIZE 3,8

SIZE 5,7

SIZE 8,8

NOx PREDICTIONS Fuel: typical refinery gas

0

20

40

60

80

100

120

140

160

0 50 100 150 200 250 300 350 400

Preaheating air temperature °C

NOxmg/Nm³ 80-160

Staged air is mixed withthe combustion productsfrom the primary zone,witch lowers the peakflame temperature.

Sub-stoichiometric conditionsin primary zone increasethe amount of reducingagents (H2 and CO)

Gas Inlet

Pilot

For major capacities, please contact ITAS.

ITAS S.p.a. is an engineering company designingand supplying, amongst many other products,burners and accessories for combustion systemas well as entire turn-key combustion plants.





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ITAS Air Staging Forced Draft Gas Burner mod. RF-FDG · 2018-11-02 · ITAS Air Staging Forced Draft Gas Burner mod. RF-FDG earth air water fire burner main dimensions1 1 Dimensions