AERCO Steam Generator - Manual (Page 9)

INSTRUCTIONS – AERCO HELITHERM STEAM GENERATOR MODEL SS1B-PLUS
SG-101-7
PRINCIPLE OF OPERATION
The AERCO Helitherm Heat Exchanger
(Generator) SS1B-P1us consists of four
principal parts (see Figure SG-101-3):
1. Shell with Top and Bottom Heads
2. Coils assembled to Primary Steam Riser
and Condensate Return
3. Pressure Control Unit
4. Water Level Control Unit
Cold Water enters the Generator through the
inlet connection and dispenser (dispersion
tube) in the bottom head. The Cold Water in
the shell, then, flows upward among the coils
(heating surfaces) and, heated, is converted to
Secondary Steam which is discharged through
the Secondary Steam outlet connection in the
top head.
Primary Steam enters through the Primary
Steam Control Valve and its inlet connection in
the bottom head and is fed through the
Primary Steam riser to the inlet of each coil
unit. The Primary Steam then flows through
each coil unit simultaneously in parallel,
leaves through each coil outlet as
Condensate, enters the condensate return,
and leaves the Generator through the
condensate outlet connection in the bottom
head of the Generator.
The Pressure Controller senses the pressure
of the Secondary Steam at any given moment
and signals the Primary Steam Control Valve
to modulate between full open or closed as
necessary to maintain the required Secondary
Steam outlet pressure.
The Water Level Controller senses the level of
water in the Generator at any given moment
and signals the Water Solenoid Valve to open
or dose as necessary to maintain the desired
water level in the Generator.
Figure SG-101-3. AERCO Steam Generator
Schematic