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The tubes can be attached to
headers by expanding, welding or ferrules.
The arrangement of refractory being reduced
to almost nothing, the maintenance is
minimal .The Aqua tube can be started up in
minutes compared to hours for a fire tube
boiler. It can be fired with oil or gas or
combination burners. The Aqua tube boiler
can be used as a high temperature hot water
heater as well as low or medium temperature
hot water heater. The Aqua tube can be used
also for glycol/water mixture heating at
low, medium or high temperature .
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It can also be used to heat
medium or high temperature thermal fluids
since it can be used as a forced circulation
heater with an equally balanced and
controlled fluid flow through each tube.
Typical clients for such a
boiler with be the commercial clients where
hot water or steam is required for heating
or for the processes like dry cleaners,
apartment, building etc., institutional
clients like schools, university campus,
hospitals and industrial
clients like food processing, textiles,
pulp & paper, wood processing
etc….
The Aqua tube boiler is
ideal for boiler replacement projects. The
entire unit can be supplied as a field
assembly kit and is easy erected on site
when boiler room access is a problem. It can
also be shipped to the client as a complete
assembly with burner and controls ready to
be fired.
The design will allow a
boiler manufacture, to mach any fire tube
boiler sizes and applications, to offer this
design for high temperature hot water, for
thermal fluid or glycol/water and to mach
also the low end of the D-type, A-type and
O-type with different ranges. This design
can also be built for very high pressures.
It is the most versatile water tube boiler
design on the market for different
capacities.
The Aqua tube Boiler Standard
Equipment:
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High limit temperature
control with manual reset.
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Modulating or high low
controller.
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Probe type low water cut
off.
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Boiler or burner mounted
control panel.
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Optional combustion
control system and boiler available to
comply with the most stringent
specifications and applications.
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Pressure gauge.
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Operating temperature
controls.
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Safety relief valve(s).
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Flame safe guard control.
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Main and pilot fuel
trains.
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Fully modulating or high
low burner.
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Convenient operator
controls and status lights.
Efficiency:
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-The Aqua tube boiler is
a multi pass balanced flow water tube
design with staggered tubes and
longitudinal gas passes. Heat transfer
and turbulent gas flow is optimized for
efficient heat transfer.
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Casing insulation
characteristics are excellent. The
tangent tube furnace walls are insulated
with 2200Deg F ceramic fiberboard
secured by the heavy gauge steel inner
casing panels. The steel outer cladding
allows for a suitable air gap for low
outer casing temperatures and minimal
radiation losses.
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Efficiencies of up to 85%
are normal without the use of external
heat recovery equipment.
Emissions:
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The generous furnace
volume design and resultant low heat
release rates with minimal use of
refractory result in a boiler design
that is excellent for low NOx
applications.
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NOx emissions lower than
most current regulations are easily
achieved.
Symmetrical Design:
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True symmetrical and
staggered tube layout with balanced
combustion gas and fluid velocities.
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Symmetrical tube
configuration allows for minimal tube
removal clearances of less than half a
boiler width between boilers in multiple
unit installations.
Low Maintenance:
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Tube to header
connections are industry standard,
rolled and expanded or seal welded
depending on the boiler capacity and
application. Optional drive fit ferrules
for ease of sit assembly are also
available.
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All inner casing panels
are welded to provide a gas-tight inner
envelope and outer casing panels are of
bolted construction for ease of assembly
and easy removal for maintenance.
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The Aqua tube boiler is
thermal shock proof on the fluid side
and combustion gas side. Water return
temperatures on the boiler are
acceptable at the minimum allowable
temperature above the flue gas dew point
.Differential temperatures of up to
150Deg F can be achieved when operating
on high temperature water or thermal
fluid.
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Large diameter down
comers located inside the boiler casing
provides excellent natural circulation.
There is no requirement for external
circulating pumps or site insulation.
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Access to the furnace is
available through a rear door without
changing the burner setting or
disconnecting fuel piping.
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Optional soot blowers can
be supplied for applications when heavy
oil or high fouling factor fuels are
fired.
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A Water-cooled rear
target wall design is supplied to
provide additional heating surface area,
higher efficiency, lower emission
results and the elimination of
high-maintenance refractory .An optional
water-cooled front wall design is
available to provide additional heating
surface and the complete elimination of
refractory.
Retrofit:
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The Aqua tube boiler is
ideal for boiler replacement projects.
The entire unit can be supplied as a
field assembly kit and is easily erected
on site when boiler room access is a
problem. As the entire boiler assembly
can be bolted and the tubes can utilize
a drive fit there are no requirements
for site welding or pressure vessel
welding certificates.
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Low water content and
forced circulation boiler designs for
operator exempt applications
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Low and medium
temperature hot water boilers.
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High temperature hot
water boilers.
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High and low temperature
water glycol heaters.
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High temperature hot
thermal oil heaters.
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High pressure steam
boilers.
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Low pressure steam
boilers.
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