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Packaged Steam Generators The Modulatic® Line
Flow Diagram
Operating Concept
The Modulatic®
steam generator is a once through, forced circulation, water tube
boiler in which water under pressure circulates at high velocity through
a series of coils while forced draft combustion gases travel across
the outside of the coils. The hot gases envelope the entire tube surface
making maximum use of both radiant and convective heat to achieve
very high heat transfer rates.
Water is forced by the feedwater pump into the series
connected multiple coil assembly where 90% of the water is converted
to steam. The steam and the remaining 10% unevaporated water are
carried from the boiler to the separator (where unevaporated water
is separated form the steam), providing 99%+ dry steam output. Solids
collect at the separator bottom and are blown out when the blow
down valve is opened.
Close tracking of load variations is possible through
use of a patented bypass regulator which continuously senses steam
pressure. The control changes feedwater volume to the coils in response
to every change in steam demand. This modulated flow of feedwater
varies the amount of steam output without the thermal shock of on-off
feedwater pump action experienced in conventional boilers.
In addition, a patented servo fuel control accurately adjusts fuel
and air for the most efficient combustion mixture by continually
monitoring changes in the feedwater flow. Inefficient burner cycling
is eliminated, fluctuating demands are satisfied and steam pressure
is held constant. The design is such that the boiler cannot be fired
without water being fed into the coils. .
Controls
An integral control panel contains all controls and indicators necessary
for the safe operation of the unit. A programmed operating sequence
is also incorporated for simplified startup..
Free Start-Up Service
A qualified service representative is on hand for two consecutive
days during start-up to assure trouble-free operation and provide
on-site operator training
Built to Meet Standards
Every unit is built to ASME Standards, Hartford inspected and National
Board registered. Coast Guard, American Bureau of Shipping, Factory
Mutual, Industrial Risk Insurers, Lloyds and other approvals are also
available upon request.
Factory Tested
All units are fire tested for up to three days at the factory, with
their individual controls to assure proper operation and to allow
for control adjustments, which avoid installation delays.
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