The operator interface to the CEMS equipment shall be via CRT
screen.
2.9
WASTE HEAT RECOVERY EQUIPMENT
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NOTE: Economizer or preheater will be selected to
be compatible with pollution control equipment being
utilized.
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Each boiler shall be equipped with [an economizer] [an air preheater].
Units may be separate from or integral with the boiler and shall be
complete with insulation and jackets, casings, supports and access doors,
and shall have provision for tube or tube bundle removal and for cleaning.
Soot blowers shall be provided as specified in paragraph BOILERS.
2.9.1
Economizers
Economizers shall be of a type normally provided by the boiler manufacturer
and shall include [finned tubes] [bare tubes] baffles and headers and shall
have provision for cleaning and tube bundle removal. At maximum load,
economizer exit water shall not be within 17 degrees C 30 degrees F lower
than saturation temperature. Materials shall be capable of withstanding
the maximum boiler exit gas temperature plus 28 degrees C 50 degrees F.
The tubes shall conform to ASME BPVC SEC I. The overall design and
installation shall preclude cold-end corrosion under any load condition.
Economizer tube metal temperature shall be above the maximum flue gas
dewpoint for the fuel being fired under all load conditions.
2.9.2
Air Preheaters
Air preheaters shall be a type normally provided by the boiler manufacturer
and shall be the recuperative tube plate or regenerative type constructed
of materials adequate to withstand the corrosion effects of the flue gases.
The overall installation shall preclude cold-end corrosion of the air
preheater under any load condition. Temperatures of metals in contact with
flue gas shall be above the flue gas maximum dewpoint temperature for the
fuel being fired under all load conditions. Control shall be by
steam-preheat or by automatic bypass and shall be integrated with the
combustion control system.
2.10
DRAFT FANS
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NOTE: Where fans are not protected by electrostatic
precipitators or baghouse filters on boilers of
10,000 pounds per hour and larger, provide liners
for scroll sheets and rotor blades.
Induced draft fan outlet dampers may not be required
in single fan/single boiler installations, except to
eliminate the stack effect during outages.
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Centrifugal fans conforming to AMCA 801 [Type I] [Type II] [forced-draft]
[and] [induced-draft] shall be furnished as an integral part of boiler
design. Fans shall be centrifugal with [backward curved blades] [radial
tip blades] [or] [axial flow type]. Each fan shall be sized for an output
SECTION 15559A
Page 57
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