MIL-HDBK-1003/7
Table 6 (Cont.)
Equipment Selection For Boiler Plants
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* Equipment
*
Size or Type
Pertinent Information
*
*
* Forced draft fan
*
Backward inclined or
Safety factor for test
* MIL-F-18523,
*
backward curved single
block ratings same as
* Fan, Centrifugal
*
thickness blade
for ID fans.
* Draft Forced and
*
*
* Induced
*
*
* Induced draft fan Straight radial with
*
Safety factor for test
*
* MIL-F-18523
shrouds or radial tip
block ratings. Coal, 20%
*
*
(forward curved-
excess pressure; oil and
*
*
backward inclined)
gas, 10 to 15% excess
*
*
volume, 20 to 25% excess
*
*
pressure. Add 25 deg F to
*
*
temperature of gas.
*
*
* Wet scrubber
*
Flue gas desulfurization for
fuel sulfur content up to 4.5% *
*
*
*
* Baghouse
*
Pulse jet cleaning up
Particle removal from flue
*
*
to 50,000 actual cubic
gas. Do not use for oil
*
*
cubic feet per minute
firing because of bag
*
*
(ACFM). Reverse air
blinding or for wood chip
*
*
cleaning over 100,000
or solid waste firing be
*
*
ACFM. Either pulse
cause of fire hazard. Use
*
*
jet or reverse air
with fuel with sulfur
*
*
between 50,000 and
content in compliance with
*
*
100,000 ACFM.
air pollution regulation
*
*
or with a dry scrubber.
*
*
* Mechanical
*
Multiple tube, high
Flue gas large particulate
* cyclone dust
*
efficiency
removal, 60 to 80%
* collector
*
efficiency is common minimum
*
*
protection for ID fan. Use
*
*
upstream of baghouse.
*
*
* Electrostatic
*
Rigid frame
Particulate removal from
* precipitator
*
flue gas. Use with fuel
*
*
which is in compliance with
*
*
*
*
regulations for sulfur.
*
*
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