f.
Differential pressure gage (baghouse module and panel board).
g.
Fan current.
h.
Fan inlet static pressure.
i.
Fan outlet static pressure.
j.
Opacity.
Provide suitable laminated plastic nameplates for devices on panel face.
Temperature controller and differential pressure gage shall be mounted on
face of panel. In addition, provide a two pen, 250 mm 10 inch diameter
circular chart recorder to record inlet gas temperature and pressure drop
across baghouse system for each module. Differential pressure gage for
each module shall be indicating type with diaphragm magnetically coupled to
pointer mechanism.
Units shall include a programmable controller which shall be completely
solid state and shall be preprogrammed to control the following.
a.
Pulse duration (pulse-jet only).
b.
Pulse sequencing (pulse-jet only).
c.
Cleaning cycle time.
d.
Settling time.
e.
Module isolation valve control.
The system shall sense differential pressure between inlet and outlet of
each baghouse. When the differential pressure reaches the setpoint,
controller shall initiate cleaning of all modules. In addition, an
overriding timer shall be provided so that the bags can be cleaned on a
preset interval independent of pressure differential. (Pulse interval and
duration), cleaning cycle time, setting time and time for valve operation
shall all be adjustable. Differential pressure setpoint shall also be
adjustable.
2.12.2
Analog Control Systems
Furnish an analog control system complete with transmitters, flow-measuring
elements, control modules, control system cabinets and panelboard, control
operating stations, prefabricated plug-in cables, signal converters,
control drives and accessories as required to allow control of the FGD
system from the central steam plant control room. The control systems and
instruments shall be electronic and be designed for continuous operation.
The control system shall be of the "split architecture" design where
computing and logic modules are mounted in system cabinets. Operating
stations shall be mounted in the panelboard and connected to the system
control module racks, mounted in the system cabinets, using prefabricated
cables.
2.12.2.1
Electronic Control Modules
Analog computing and logic modules shall use proven solid-state electronic
design. Circuits shall be constructed with high-quality, pretested
components making maximum use of integrated circuits. Components shall be
SECTION 15864N
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