POWER June 2013 - 31

HEAT RECOVERY STEAM GENERATORS
2. Cold startup. The dynamic response of the modeled NGCC during a cold startup is illustrated.
Source: Foster Wheeler North America Corp.
3.0
2.5
2.0
1.5
1.0
0.5
60
1,500
CT flow
1,000
CT temperature
Drum pressure
Drum temperature
Steam flow
120
dynamic response of the HRSG to generate
steam and to maintain the tube metal temperatures
below the design limits.
Evaporator Analysis. THTNET is an
in-house computer code developed by Foster
Wheeler that performs one-dimensional
transient thermal/hydraulic analysis of a
flow heat transfer network through finite
180
Time (minutes)
difference techniques. The program has
the capability to model system components
such as tanks, shell-tube heat exchangers,
and control valves.
The THTNET model of the analyzed highpressure
(HP) evaporator is shown in Figure 3.
It consists of 170 steam/water nodes and 120
flue gas nodes, for a total of 290 nodes. The
240
300
360
3. Evaporator model. The nodes selected
in the high-pressure evaporator for the
THTNET model are illustrated. The evaporator
consists of many pipe loops connected to
the steam drum in parallel. Courtesy: Foster
Wheeler North America Corp.
500
model begins at the steam drum, follows the
fluid flow through the downcomers, into the
transfer piping, up through the feeders, into
the feeder headers, through the heat transfer
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June 2013 | POWER
www.powermag.com
31
Flow (million lb/hr)
T (F) or P (psia)

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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
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