POWER June 2013 - 40
PLANT DESIGN
heat balance but still within design limits.
Table 3 shows overall performance for the
two repowering options. This shows that
the upgraded HP/IP turbine steam paths
improve output by about 13 MW and reduce
heat rate about 1%.
1. Heat rate of the repowered plant configuration alternatives. Repowered
performance is based on the Siemens SGT6-8000H combustion turbine operating at full load at
the average annual ambient temperature with variable duct firing. URS Corp.
Existing HP/IP steam path
7,000
6,950
6,900
6,850
6,800
6,750
6,700
6,650
6,600
6,550
6,500
Fired to 50 psig
crossover pressure with
LP economizer bypass
Upgraded HP/IP steam path
As explained above, the crossover
pressure limit restricted the maximum
duct-firing rate. One means of increasing
output that was evaluated by this analysis
was to bypass a fraction of the condensate
around the LP economizer directly to the
LP drum. This reduced the amount of LP
steam admission and hence allowed greater
duct firing, more HP steam flow, and
increased output without exceeding the
crossover pressure limit, but with an increase
in heat loss to the stack and a heat
rate penalty (Figure 1).
Unfired
Fired to 50 psig crossover
pressure without LP
economizer bypass
380 385 390 395 400 405 410 415 420 425 430 435
Net output (MW)
New Combined Cycle Options
There is sufficient space at a corner of the
plant property for a new 2 x 1 F-Class combined
cycle. Conceptual designs were developed
based on the GE 7FA 3-Series and 7FA
5-Series combustion turbines. Alstom, Mitsubishi,
and Siemens also offer suitable units
that should be considered if the new plant
option is pursued. The minimum net output
of the new plant options was 560 MW, at the
average annual ambient temperature.
The overall performance of these two
plants is summarized in Table 4. The GE
7FA 3-Series based plant is able to achieve
Enhanced PDF version now available
The 2013 UDI Who's Who Directory covers more than 4,200
U.S. and Canadian generating plants. The directory provides:
* Nearly 8,500 plant management and support
contact names, titles, and primary job functions.
* Basic plant operating statistics for more than 1,500
power stations, including:
Generation (MWh)
Availability (%)
Heat rate
Capacity Factor (%)
* Power plant design characteristics
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40
www.powermag.com
POWER | June 2013
Net heat rate, Btu/kWh (HHV)
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POWER June 2013
Table of Contents for the Digital Edition of POWER June 2013
Contents
POWER June 2013 - Cover1
POWER June 2013 - Cover2
POWER June 2013 - Contents
POWER June 2013 - 2
POWER June 2013 - 3
POWER June 2013 - 4
POWER June 2013 - 5
POWER June 2013 - 6
POWER June 2013 - 7
POWER June 2013 - 8
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POWER June 2013 - Cover3
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