TEFC NEMA frame motor and shall be complete with inlet cone and screen and
flange outlet. Combustion air fan shall be bottom flanged to be mounted on
same structural member as windbox. Combustion air-fan shall be sized to
provide sufficient static pressure to overcome system losses when providing
15 percent excess air at maximum firing rate, plus the amount of flue gas
induced to comply with the NOx emission requirements.
2.4.5
Combustion Air Damper
Combustion air damper shall be flanged and located between combustion air
fan and windbox. Combustion air damper shall be suitable for specified
turndown and shall provide same turndown performance when up to 15 percent
flue gas is induced and mixed in the airstream.
2.4.6
Fuel Oil Burner
Fuel oil burner shall be [mechanical pressure atomizing] [ steam
atomizing][air atomizing] type conforming to UL 296, UL 726 and NFPA 8501,
capable of burning [heated] [unheated] [No. 6] [No. 4] [No. 2] fuel oil.
Fuel oil burner shall be capable of firing boiler to maximum capacity with
turndown range of [eight (8) to one (1) for boiler above 2452 kW 250
horsepower] [four (4) to one (1) for boiler 2452 kW 250 horsepower or
less]. Fuel oil burner shall be quiet in operation without blowtorch
boiler. Fuel oil burner shall be easily moved out of firing position for
cleaning, inspection, adjustment and maintenance.
2.4.7
Natural Gas Burner
Natural gas burner shall be a multi-spud burner with gas feed pipe in
center of air register for easy removal. Natural gas burner shall be
forced draft type and shall be suitable for efficiently burning natural gas
having a calorific value of [_____] Joules per cubic meter Btu per cubic
foot when supplied at a pressure of approximately [_____] kPa psig.
Natural gas shall be discharged in burner throat area. Natural gas-air
premix or natural gas discharged outside of burner throat are not
acceptable. Main natural gas burner shall be capable of firing the boiler
to maximum capacity with a turndown of [ten (10) to one (1) for boilers
above 2452 kW 250 horsepower] [four (4) to one (1) for boilers 2452 kW 250
horsepower or less].
2.4.8
Flame Safeguard System
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NOTE: Edit for fuel choice and select appropriate
options.
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a
The flame safeguard system shall be manufactured by burner
manufacturer and mounted in boiler control panel as a panel
insert. Flame safeguard system components shall be UL listed.
Complete and automatic flame safeguard system shall be provided in
accordance with NFPA requirements safe start-up, on-line operation
and shut-down of package burner.
b.
Flame safeguard system shall be micro-processor based system
including, but not limited to, automatic burner sequencing, flame
supervision, status indication, fire-out annunciation and self
SECTION 15561A
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