POWER August 2013 - 53
PLANT DESIGN
4. Maximize steam production. The HRSG produces ~300,000 lb/hr of high-pressure
(HP) steam at 950F/780 psig and ~55,000 lb/hr of low-pressure (LP) steam at 520F/74 psig when
the CT is operating at baseload at average ambient conditions, with no duct firing. The steam
production can be peaked by duct firing the HRSG. Under maximum duct-firing conditions, the
HP and LP superheater outlet flow rates are approximately 490,000 lb/hr at 950F/1,280 psig and
45,000 lb/hr at 590F/100 psig, respectively. The maximum heat input to each duct burner is 240
MMBtu/hr. Courtesy: Burns & McDonnell
plate was installed on the diverter outlet to
the HRSG, allowing construction to progress
while operating the combustion turbines.
WhalcoMetroflex supplied the gas flow
diverter damper, Merrill Iron & Steel supplied
the bypass stack, and Higgot Kane, a
division of ATCO Noise Management, supplied
the bypass stack silencer. The gas flow
diverter uses a toggle-driven single blade
within an internally insulated cube. The single
blade directs combustion turbine exhaust
flow by isolating either the bypass stack inlet
or HRSG inlet. The blade offers 99.97%
sealing efficiency by mating with a double
seal boundary that uses pressurized seal air
to eliminate exhaust gas leakage. The blade
completes a cycle in only 90 seconds and can
close to bypass position in 60 seconds in an
emergency. The gas flow diverter damper allows
online switching from combined cycle
to simple cycle mode but does not allow
switching from simple cycle to combined
cycle.
Steam Turbine Refurbishment. GE
originally furnished the Unit 1 and 2 steam
turbines in 1968. Each is a 17-stage straight
condensing unit rated at 60 MW. Each was
designed to pass 503,000 lb/hr of steam at inBefore:
worn throatbush
Silicon Carbide Polymer (SiCP) repair is now
available at the Cartersville, Georgia Total
Care Center
We can bring worn components
back to original dimensions. Our
specialized SiCP process can repair
your worn parts to meet original
equipment standards.
SiCP is the optimum solution for severe corrosion
resistance where erosion is a concern.
Contact a Weir Minerals Services™
Total Care Center today.
155 Wansley Drive
Cartersville, Georgia 30121
T: 770-386-WEIR (9347)
www.weirminerals.com/Service
After: restored throatbush using SiCP
Copyright © 2013 Weir Slurry Group, Inc.. All rights reserved. MATERIAL MATTERS and the M2 Material Matters logo are trademarks and/or registered trademarks
of Weir Minerals Europe Ltd.; WEIR is a trademark and/or registered trademark of Weir Engineering Services Ltd.
CIRCLE 26 ON READER SERVICE CARD
August 2013 | POWER
www.powermag.com
53
Excellent
Minerals
Solutions
http://www.weirminerals.com/Service
http://www.powermag.com
POWER August 2013
Table of Contents for the Digital Edition of POWER August 2013
Contents
POWER August 2013 - Cover1
POWER August 2013 - Cover2
POWER August 2013 - Contents
POWER August 2013 - 2
POWER August 2013 - 3
POWER August 2013 - 4
POWER August 2013 - 5
POWER August 2013 - 6
POWER August 2013 - 7
POWER August 2013 - 8
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POWER August 2013 - Cover3
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