2.3.3
Insulation
Insulate the economizer with not less than the equivalent of 50 mm 2 inches
of mineral wool insulation and lag with not less than 27 gage galvanized,
weatherproof lagging.
2.4
BURNER AND WINDBOX PACKAGES
2.4.1
Oil Burner/Windbox Package
**************************************************************************
NOTE: The designer shall fill in the appropriate
information as defined in MIL-B-18796.
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Provide a fully modulating, oil burner conforming to MIL-B-18796, Size
[_____], Class [_____], Control sequence [____], Combustion control system
[_____] except as modified below. Provide burner with windbox, [forced
draft fan,] dampers, fuel train and associated controls to comprise a
complete factory assembled package. Total heat input to the boiler furnace
shall be provided by [_____] burners. The burner package shall be
considered an integral part of the steam generator and shall be subject to
applicable provisions of the boiler design and service together with
requirement of tests, performance guarantees and other warranties specified
for the boiler.
2.4.1.1
Oil Burner
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NOTE: At the text below, for boilers below 3.15
kg/sec 25,000 pounds per hour the designer shall
select either compressed air or steam atomization
after performing an economic analysis. For 3.15
kg/sec 25,000 pounds per hour and above, atomization
shall be by compressed air unless steam pressure is
required for greater turndown.
**************************************************************************
a.
Oil Burner Characteristics: The burner shall be quiet in
operation and shall operate with a balanced clean stable flame so
as not to localize heat in any part of the combustion chamber.
The burner shall be capable of completely atomizing and
effectively mixing the oil with air so as to insure complete
combustion. The air admitted shall be of sufficient quantity for
complete combustion, but not of such quantity as to produce an
undue percentage of excess air with attendant high stack loss.
The burner shall operate without clogging or failure, and shall
have sufficient capacity to develop not less than the specified
capacity. The burner unit shall be easily removed from firing
position and readily accessible for inspection, cleaning, and
other purposes. Provide observation ports to view operation of
burner. There shall be no flame impingement on the sidewalls,
top, bottom or rear walls of the furnace. Burner manufacturer
shall furnish, and Contractor shall install refractory throat
tiles or other items required for proper installation of burner.
b.
Atomization: Burner shall be [steam atomizing; steam pressure at
header is [_____] kPa (gage) psig; steam temperature at header is
SECTION 15511N
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