Fulton Ancillary Equipment SteamPac Unfired Steam Generators - Manual (Page 39)

Fulton Thermal Corp.*SteamPac Unfired Steam Generators Manual* Version 2010-0201
Page 39
Section 3 – Operation
1. Unit Description and Application
a) The basic system consists of a fully automatic oil or gas fired Fulton Thermal Fluid Heater
with circulation pump and expansion tank which delivers high temperature thermal fluid to
the independent unfired steam generator (as well as to other heat exchange equipment).
b) The steam generator, can, therefore be sited where the steam is required thus avoiding
long runs of distribution pipework.
c) The vertical steam generator basically consists of a small diameter cylindrical shell,
inside which is the single or multiple tube heat exchanger, containing the hot thermal
fluid. Water is fed into the bottom of the shell and is turned into steam by means of the
exchange of heat from the thermal fluid. The steam is discharged from the top into a
steam separator immediately above. Dry steam is thus produced. The steam output can
be widely varied with great rapidity. Output is varied by controlling the rate of circulation
of the thermal fluid through the unit by means of a control valve.
d) Since the shell diameter is small, the liquid content is minimal giving very safe operation.
The unit is very compact although relatively tall.
e) It includes various accessories such as safety valve, feed pump, control panel box,
pressure gauge, pressure switches, 3-way fluid control valve feed tank and pipework.
f) The unit thus gives rapid steam raising, with widely varying load and, if required, at
reasonably high pressures due to the small shell diameter. It is fully automatic once put
into operation.
2. Basic Operation
a) In the main heat exchanger hot thermal fluid (refer to the original specification/quotation
for minimum required thermal fluid temperature) passes through the tube bundle and is
controlled by the quick acting two or three way control valve. Water is fed into the shell
side of the exchanger from the treated return tank via the boiler and feed pump and feed
check valve(s).
b) Vertical units: The wet steam produced in the heat exchanger passes through into the
steam separator above. Water from the separator returns under gravity to the bottom of
the heat exchanger via feedwater piping. Dry steam flows to the users from the final stop
valve above the separator for vertical units, steam outlet connection for horizontal
models.
c) Horizontal units: Horizontal steampacs consist of custom designed single or multiple to
be heat exchanger, containing the hot thermal fluid, mounted in a large horizontal shell.
Steam is produced in this vessel, passes over the internal baffling and exits through the
steam outlet.