Fuel Atomizing Head - Aerotech BT 400-46 Installation And Operation Maintenance

Section 4
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Beware of chips – Pipe, tubing and valve ends must be clean. System contaminants in
any valve can foul valve seats and cause leakage. Back flush systems before putting in
service whenever possible. Install screen or filters where required to protect valves.
Pipe Dope – Goes on male thread carefully so nothing gets in valve and system. Strings
4.18

Fuel Atomizing Head

4.19 The fuel nozzle screws into a nozzle holder, the combination being known as the fuel atomizing head. Fuel
from the inlet line enters the nozzle supply chamber through a strainer screen (see figure 4-4), then flows
through slots in the inner had through which impacts a whirling motion to the fuel so that it partially
atomizes as it enters the swirl chamber. Atomization is completed as the fuel sprays through the discharge
orifice into the combustor. A portion of the fuel is also forced into a by-pass chamber which leads to the
by-pass outlet passage in the nozzle holder. A check valve connected between the outlet and by-pass fuel
line prevents a reverse fuel flow to the nozzle from the by-pass line. Fuel is discharged from the nozzle at
a fixed continuous rate and a continuous fixed flame is obtained. Changes in heat output is obtained by
varying the volume of fuel discharged from the nozzle. This is accomplished indirectly by controlling the
amount of fuel flowing through the by-pass fuel line through the action of the temperature selector valve.
! CAUTION !
of tape type sealants can foul valve seats.
Figure 4-4 • Fuel Atomizing Head
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AEROTECH HERMAN NELSON INTERNATIONAL INC.
100 Eagle Drive, Winnipeg, Manitoba Canada R2R 1V5
Phone: 204-633-1999 (24 Hours) Fax: 204-694-1612 Email:
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12.18.07 REVISION 1.02
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