This panel shall contain relays, contractors (fused switches or circuit
breakers), control transformers, and other devices required for complete
control of the heater system. Master heater control panel shall be located
as indicated. Panel components shall be factory installed and wired in a
NEMA 4 enclosure and shall include the following.
a.
A main-fused switch or circuit breaker.
b.
A fused switch or circuit breaker, contractor alarm relay, with
two normally open contacts. A selector switch, "HAND," "OFF,"
"AUTO," red "ON" light, and white "LOW TEMP" alarm light for each
local heater panel. The contractor shall have a 120-volt
operating coil.
c.
Device and enclosure nameplates.
d.
Auxiliary relays and equipment required for operation of the
heating and alarm systems.
2.8.6
Manifolds and Draft Equipment
Furnish inlet an outlet manifold ducts as part of each fabric filter
baghouse. Manifolds shall be sealed by continuous fillet or complete
penetration groove welds to provide gas-tight construction, fabricated from
minimum 6 mm 1/4 inch thick ASTM A 36/A 36M steel plate, and properly
stiffened. Manifolds shall have necessary expansion joints conforming to
the requirements of the paragraph entitled "Ductwork and Draft Equipment"
and access doors and shall be supported from the fabric filter baghouse
structure. Structural design shall be based on assumption the ducts may be
30 percent full of fly ash. Taper inlet manifolds to maintain a uniform
gas velocity to all modules. Size manifolds to minimize pressure drop, but
also so that velocities shall be between 28 to 30 meters per second 5,500
to 6,000 feet per minute at 100 percent of boiler load capacity to minimize
ash drop out of the gas stream. Inlet manifold take-offs to each module
shall be located in or near the bottom of the duct to assist in sweeping
the dust into the modules. A replaceable, abrasion resistant baffle plate
shall be furnished at the inlet to each module to prevent abrasion of the
bags. Each module shall be provided with inlet and outlet dampers. Inlet
and outlet dampers shall be the manufacturer's standard type. Each fabric
filter baghouse shall be provided with bypass dampers to bypass the fabric
filter baghouse during start-up and shutdown, during oil firing, and in the
event of excessive flue gas moisture conditions due to spray dryer absorber
malfunction Bypass dampers shall be as specified in paragraph entitled
"Ductwork and Draft Equipment."
2.9
LIME SLURRY PREPARATION SYSTEM
**************************************************************************
NOTE: Pressures, rates, and duration of sootblowing
will depend on site conditions and acceptable
operating procedures.
**************************************************************************
Provide a single lime slurry preparation system to serve [_____] spray
dryer absorbers. Provide the lime slurry preparation system with equipment
for receiving, storing, feeding, and slaking pebble quicklime, and for
storing and pumping lime slurry of sufficient quantity and quality as
required for use in the FGD system. Lime system component equipmentand
controls shall be as specified in paragraph entitled "Lime Slurry
SECTION 15864N
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