POWER October 2013 - 70

EMissions
into detailed design drawings for fabrication
and installation. The GSG blade detail
drawing was completed in advance, based
on Fuel Tech's standard design. Engineering
added the final perforated plate details and
turned these drawings over for fabrication.
Engineering also began redesign of the support
for the SCR pressure load where the egg
crate support steel was removed. The egg
crate steel not only supported the old flow
straightener weight but also restrained the
pressure forces on this elevation. A buckstay
arrangement was developed to resist these
forces.
The selected arrangement was installation
855 PM 55Chevy 042213_Layout 1 4/21/13 9:42 PM Page 1
of the GSG device with a perforated plate at
the turning vane location. The GSG replaced
the turning vane and egg crate functions by
turning the flow 90 degrees and aligning the
flow vertically to pass through the catalyst
layers. A perforated plate was needed on the
GSG blades' leading edge to overcome the
low flow at the SCR A and B division wall.
The flow statistics did not quite reach the
desired project goal of 100% of all flow velocities
within +/-15% of arithmetic mean.
The final model showed flow distribution
statistics with 91% of all analyzed flow velocities
within +/-15%, which is equal to
9.5% root mean squared (rms). This was a
significant improvement compared to the
original, traditional turning vane design
where 58% of flow velocities were within
+/-15% (17.5% rms). The flue gas flow direction,
shown with velocity vectors, was
excellent. The flow recirculation was nearly
eliminated, except at the two truss systems,
and the flow direction was vertical going
into the catalyst (Figure 3).
Fabrication of the GSG modules was
straightforward. These modules were completed
and shipped to the site prior to installation
crew needs during the October outage. The late
addition of the variable perforated plate added a
complication to the fabrication schedule. Fabrication
time at six different shops was secured to
laser or plasma cut all the perforated plate parts.
The final GSG device with perforated plate was
installed as shown in Figure 4.
One wrinkle was that the egg crate steel
above the Layer 1 catalyst had included
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4. Fewer obstructions. The new design
is shown from above (top) with the
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Creating Value.
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2415 Park Avenue
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563.263.3410
Fax: 563.262.0510
www.carverpump.com
CIRCLE 37 ON READER SERVICE CARD
70
www.powermag.com
POWER | October 2013
http://www.carverpump.com http://www.powermag.com
POWER October 2013

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