operating floor of Turbine Koom showing one of
the "3000 KW” turbo-generators in foreground
Efficient operation of the stoker-fed boilers
calls for the use of 1 Vz’ x 0 Nut and Slack of a
good quality, medium volatile, high fusion coal.
The pulverized fuel boilers, on the other hand, can
be efficiently operated with coal of lesser quality
including the cheaper carbon coals which are
Va” X 0 in size.
The operation of the boilers is completely auto
matic, which means that as the demand for steam
changes, the controls automatically adjust the flow
of coal and air, while maintaining the required
header pressure and draft conditions throughout
the furnace. This is accomplished with combus
tion control instruments, which permit operation
from master controls or by hand.
Water feed is heated before it enters the boilers.
The purpose of this is to liberate oxygen and en
trained gasses and to bring its temperature closer
to that within the boiler drum.
In high pressure boilers, such as ours, the water
within the boilers must be chemically treated to
prevent corrosion, caustic embrittlement and the
formation of scale in the tubes. It is the responsi
bility of the Filter Plant personnel to supervise
this and to maintain the proper chemical balance.
A 225 foot brick chimney provides draft for the
four stoker-fed boilers; but in the case of the pul
verized fuel boilers, this function is performed by
induced draft fans.
tvith the Ikvo smaller turbines and switchboard in
the background.
Approximately 8% of the steam generated is
used at the boiler plant to operate its auxiliaries.
The balance is sent to the Turbine Room for
generation of power and for distribution to the
paper mill and cellophane plant for process and
heat.
This steam is conveyd through four overhead
steamlines to the Turbine Room. Here are lo
cated four turbo-generators rated at 2000, 4000
and two at 5000 KW respectively, making a total
capacity of 16,000 KW. Power is generated at
two voltages—575 on the two smaller units and
4160 on the two larger units. All power gener
ated is 60 cycle AC.
The turbines operate at the high speed of 3600
revolutions per minute which is automatically con
trolled by a governor. Barring emergencies, the
turbines can be operated continuously for long
periods of time without being taken off the line,
but they require the constant attention of the op
erators.
A tie-in permits purchase of power from Duke
Power Company which maintains a sub-station
adjacent to the Turbine Room. By choice, we can
operate synchronized with Duke or independently.
Of the total power used approximately 7% is pur
chased.
Thus all power used is generated at or passes
through the Turbine Room where all essential