compressed air. Provide each row with a compressed air header including
heavy duty, stainless steel, internal, diaphragm pulse valves and solenoid
actuators to distribute the compressed air to the bags. Diaphragm valves
shall be factory wired to a junction box and shall be no louder than 84 dBA,
1.50 meters 5 feet from the valve. After the bags are cleaned, the
compartment shall remain offline for [_____] seconds to allow the dust to
settle into the hoppers. Provide the distribution piping with couplings to
allow removal of piping for bag replacement.
]2.8
BAGHOUSE CONTROLS
2.8.1
Control Functions
Provide main baghouse control from the boiler plant control room panel
board. The main control system shall include the following operational and
monitoring functions:
a.
Automatic and manual startup and shutdown.
Provide manually
initiated automatic startup sequence.
b.
Automatic baghouse control.
**************************************************************************
NOTE: For pulse jet cleaning systems both off line
cleaning (normal) and on-line cleaning are available.
**************************************************************************
c.
Automatic bag cleaning. Provide an automatic timer to initiate
compartment cleaning when differential pressure across the bags
reaches a set point.
d.
Programmed bag cleaning. Provide an overriding timer to initiate
compartment cleaning on a predetermined adjustable programmed
cycle independent of pressure differential. Provide for
[adjustable pulse jet duration time,] [adjustable pulse jet
sequencing,] adjustable cleaning cycle time, adjustable settling
time, and adjustable isolation valve operation.
e.
Manual bag cleaning. Provide a manual selector switch to allow
manual compartment cleaning.
f.
Operations monitoring. Provide graphics and audible alarms to
monitor equipment status for abnormal operation, malfunction,
failure, or trip.
g.
Automatic shutdown of malfunctioning components. Provide
automatic and safe shutdown of malfunctioning components with
minimal disruption to boiler operational capabilities.
h.
Automatic and manual bypass. Provide automatic and manual bypass
for out of service compartments or for system upset conditions.
Design controls to bypass the baghouse when the inlet temperature
is below [_____] degrees C F or above [_____] degrees C F. When a
compartment is bypassed, exclude from the automatic cleaning cycle.
i.
Compartment lockout. Interlock the automatic timer, overriding
timer, and manual selector switch of each compartment with an
isolation switch located at the tube sheet access door to isolate
the compartment for maintenance.
SECTION 15863N
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