further removal of moisture. From the scrubber
steam separator/water reservoir to the tube
element, the steam passes through an orifice and
bundle and back to the steam separator. The
enters the dry pipe, which carries it to the steam
pump is capable of recirculating boiler water at
header. The separated water falls to the base of
a rate that exceeds the evaporation rate.
the separator. Vanes in the base of the separator
serve to maintain the rotary motion of the water
until it is discharged from the outer edge of the
Control Condenser
separator into the reservoir.
Connections are provided on the steam drum
The purpose of the control condenser is to
for high- and low-water level control, feedwater
condense the excess steam resulting from
inlet, boiler-water outlet, and a water level sight
variations of steam demand and exhaust gas
gauge. A manhole provides access for inspection
temperature. The condenser (fig. 7-32) is a
and maintenance. Provision is also made for
shell/tube design with the coolant (seawater)
bottom blowdown and draining. The two safety
flowing through the tubes, It has the capacity to
valves, vertically mounted on the shoulder flanges
condense the total boiler output at all operating
of the steam separator drum, protect against over-
conditions.
pressurization. The valves are identical except for
their pressure settings. Steam discharge from the
safety valves is piped to the exhaust gas outlet
Boiler Control Panel
duct.
The control panel is an integral part of the
Recirculation Pump
waste-heat boiler. It contains the boiler controls,
warning lights, an alarm bell, indicating lights,
The purpose of the recirculating pump is to
and gauges for local monitoring of all boiler
provide a continuous flow of water from the
operating parameters and steam distribution
Figure 7-32.--Control condenser.
7-31
