Fisher TBX-T Desuperheater0 pages

Product Bulletin

TBX-T Desuperheater

85.2:TBX-T
December 2013

D103795X012

Fisherr TBX-T Desuperheater
The Fisher TBX-T desuperheater can be used in many
applications to efficiently reduce the temperature of
superheated steam to the desired set point. The TBX-T
desuperheater is available for installation in steam
lines from DN200 through DN1200 (NPS 8 through 48)
in diameter and are capable of maintaining steam
temperatures to within 6_C (10_F) of saturation
temperatures.
Water atomization and vaporization are key elements
in any steam conditioning application. The TBX-T
design incorporates a spraywater manifold of variable
geometry AF nozzles that produce an optimized spray
pattern over a wide operating range. These nozzles are
strategically placed to achieve optimal mixing and
quick vaporization at all flowing conditions (see figure
4). Years of research in spray atomization and
vaporization were key to optimizing the water
injection system. Extensive use of CFD analysis, in
addition to field performance feedback, was used to
validate spray system enhancements.

Features

Precise Spraywater Injection-- CFD designed spray
manifold determines water injection point and
insertion depth to maximize mixing and quick
vaporization.
Thermal Liner in Body-- The TBX-T has the option of
including an integral thermal liner inside the steam
pipe. This construction is most commonly used in
boiler interstage attemperation applications, where
the desuperheater is exposed to high thermal
cycling and stress, high steam velocities , and
flow-induced vibration. The liner minimizes the
potential for thermal shock when cool water is
introduced to the unit that is already heated to the
operating steam temperature.

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X0162

TBX-T–The TBX-T desuperheater incorporates a
spraywater manifold of variable geometry Type AF
nozzles that produce an optimized spray pattern
over a wide operating range. These nozzles are
strategically placed to achieve optimal mixing and
quick vaporization at all flowing conditions (see
figure 3).

The TBX-T desuperheater can be configured with a
pressure reducing valve (PRV) immediately upstream,
with an integral diffuser, or as a standalone device.
The TBX-T (figure 1) is normally used when an
application requires a separation of the pressure
reduction and desuperheating functions. The TBX-T is
equipped with a water supply manifold which includes
a spraywater connection (NPS 1 to 4) and 2 to 4 AF
nozzles (AF14 - AF44) per manifold. The manifold
(multiple manifolds are also possible) provides cooling
water flow to a number of individual spray nozzles
installed in the pipe wall of the outlet section. The
result is a fine spray injected radially into the high
turbulence of the axial steam flow. The combination of
large surface area contact of the water and high
turbulence in the steam make for very efficient mixing
and rapid vaporization.