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QUEST.DOC
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1990-03-26
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11KB
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239 lines
.ft e
.sp 1
.in 10
.pn 0
.ds
DOCUMENTATION ON
QUEST: QUICK ESTIMATION OF STEAM TURBINE PERFORMANCE
VERSION 1.2
April 1988
developed by
Dudley J. Benton
TVA Engineering Lab
P.O. Drawer E
Norris, TN 37828
(615) 632-1887
.pa
.pn 1
_CONTENTS_
Introduction
Running the Program
_EXAMPLES_
1. 5% Over Design
2. VWO (Valves Wide Open)
3. 100% Load
4. 75% Load
5. 50% Load
6. 25% Load
7. Initial Pressure Correction Factor
8. Initial Temperature Correction Factor
9. Reheat Temperature Correction Factor
10. Reheater Pressure Drop Correction Factor
11. Exhaust Pressure Correction Factor
12. TVA's Allen Units 1-3 (300 MW nominal)
13. Arkwright (44 MW nominal)
14. TVA's Bull Run Steam Plant (950 MW nominal)
15. TVA's Colbert Units 1-4 (200 MW nominal)
16. TVA's Colbert Unit 5 (500 MW nominal)
17. TVA's Cumberland Units 1-2 (1200 MW nominal)
18. TVA's Gallatin Units 1-2 (250 MW nominal)
19. TVA's Gallatin Units 3-4 (300 MW nominal)
20. TVA's John Sevier Units 1-3 (200 MW nominal)
21. TVA's Johnsonville Units 1-4 (125 MW nominal)
22. TVA's Johnsonville Units 5-6 (125 MW nominal)
23. TVA's Johnsonville Units 7-10 (150 MW nominal)
24. TVA's Kingston Units 1-4 (150 MW nominal)
25. TVA's Kingston Units 5-9 (200 MW nominal)
26. Alabama Power's Plant Miller Units 1-4 (660 MW nominal)
27. TVA's Paradise Units 1-2 (700 MW nominal)
28. TVA's Paradise Unit 3 (1100 MW nominal)
29. Gulf Power's Scholz Plant (40 MW nominal)
30. TVA's Shawnee Units 1-10 (150 MW nominal)
31. TVA's Watts Bar Units 1-4 (60 MW nominal)
32. TVA's Widows Creek Units 1-4 (125 MW nominal)
33. TVA's Widows Creek Units 5-6 (125 MW nominal)
34. TVA's Widows Creek Unit 7 (500 MW nominal)
35. TVA's Widows Creek Unit 8 (500 MW nominal)
.pa
_INTRODUCTION_
QUEST was developed for QUick Estimation of Steam Turbine performance; and is
intended for "quick-look" analyses only. QUEST is not intended to replace more
complete steam cycle models like SCRAP. Turbine and generator performance is
from "A Method for Predicting the Performance of Steam Turbine-Generators...
16,500 KW and Larger," by R.C. Spencer, K.C. Cotton, and C.N. Cannon, General
Electric, 1974 (and ASME paper No. 62-WA-209, 1962). Steam properties are from
"Steam Tables," by J.H. Keenan, F.G. Keyes, P.G. Hill, and J.G. Moore, John
Wiley and Sons, 1969. I assume no liability for the use of this program, a
supplement to, not a substitute for good judgment. Furthermore, I make no
claim as to the usefulness or technical correctness of the "G.E. Method".
QUEST will solve a variety of fossil steam systems: any combination of high,
intermediate, and low pressure turbines (only one of each), and systems with
or without reheat. QUEST requires only simple user input to describe the
system. QUEST can solve any number of different configurations as each is
saved separately in a "QUE-file". You can describe the system interactively
using QUEST and save your configuration in a "QUE-file" or modify an existing
"QUE-file" with an editor.
QUEST has two basic options at this time. First, is to compute the performance
or operating conditions at user-defined values of boiler exit temperature,
boiler exit pressure, boiler flow (or throttle flow ratio), reheat
temperature, and backpressure. Second, is to compute the performance or
operating conditions for a predetermined set of parameters and generate a plot
of initial pressure correction factor, initial temperature correction factor,
reheat temperature correction factor, reheater pressure drop correction
factor, or exhaust pressure correction factor.
QUEST was originally intended to provide turbine performance characteristics
using the G.E. curves as input for SCRAP (or actually for STURB which
curve-fits turbine performance and translates it into the form required by
SCRAP). QUEST, however, is a useful stand-alone tool in its own right. If
all you are interested in is G.E. performance and rather simple
configurations, then QUEST may be sufficient for your needs.
QUEST is much faster and much more simple to use than SCRAP. QUEST will solve
a typical steam system on a PC with a floating point processor in 60 to 90
seconds depending on the complexity (SCRAP typically takes 10 to 20 minutes on
a PC). Simplicity and speed, however, do not come without cost. SCRAP is much
more powerful and versatile than QUEST. SCRAP, for instance, can solve
combined cycles and much more complicated configurations.
The two major differences between QUEST and SCRAP are versatility and
principle. As far as versatility, QUEST can handle at most one HP turbine, one
IP turbine, one LP turbine, one FP turbine (each, including the FP turbine,
with up to seven stages), one boiler feedpump, 8 drain pumps, one hotwell
pump, one boiler, one reheater, one SSR, two generators, 9 heat exchangers
(including one GSC), and one condenser. SCRAP, on the other hand, on a PC can
handle up to 100 turbines, 250 pumps, 250 boilers or reheaters, 100 heat
exchangers, 100 condensers, 100 open feedwater heaters, or 100 generators.
SCRAP can also handle cooling towers, combined cycles, other working fluids,
and detailed user-developed component models (QUEST uses only the G.E.
performance curves).
The reason that I developed QUEST was to provide a computational tool for
making steam cycle computations according to the "G.E. Method" - an apparently
greatly desired capability within the industry - which would be separate from
SCRAP so as not to detract from it.
_RUNNING THE PROGRAM_
To run QUEST, you must have a completely IBM compatible PC or AT. It is also
advisable to have a floating point processor as this makes at least a 10:1
difference in speed on an AT and about 30:1 difference on an XT. If you are
not sure whether or not your system has a floating point processor, insert the
floppy and type CHECK87. This will sniff-out one if you have it. Note that
QUEST will run, even if you don't.
Do not attempt to run QUEST from BASIC or LOTUS. On a PC you should be in DOS
with the DOS prompt. To run QUEST just type QUEST. It's all interactive.
To get QUEST to stop when it is waiting for you to make a selection just hit
RETURN (or ENTER). Most of the time if you hit RETURN (or ENTER) two or three
times it should stop and return to DOS. In order to abort from the interactive
system description section requires a ctrl-C.
If QUEST is waiting for you to make a selection which you do not want to make
or what you want is not in the list, and what you really want to do is return
to the main menu, just hit RETURN (or ENTER).
When QUEST is performing the iterative calculations ("iteration ??, etc..."
will flash on the CRT), it can be interrupted by simply tapping the space bar
and waiting a few seconds. Invariably the unanticipated will occur... To abort
QUEST hit ctrl-break and wait a few seconds. If this does not work, you'll
just have to boot (ctrl-alt-del).
_REVISIONS_
V1.1 (03/21/88): change last flow factor before reheater to include reheater
pressure drop
V1.2 (04/19/88): add option to divert printer output to a file; file must not
previously exist (QUEST will create a new one to avoid
unintentional write-over of existing files); to invoke this
option use "QUEST MYFILE.OUT"
.pa
_COMPARISON OF QUEST TO DESIGN_
POWER OUTPUT [MW] HEATRATE [BTU/KWH]
PLANT/UNIT(S) DESIGN QUEST %ERROR DESIGN QUEST %ERROR
Allen Units 1-3 299.2 297.7 -0.5 8862 8860 0.0
Arkwright * 43.81 43.87 0.1 9807 9793 -0.1
Bull Run Steam Plant 891.0 884.3 -0.8 8386 8415 0.3
Colbert Units 1-4 191.4 193.1 0.9 9299 9271 -0.3
Colbert Unit 5 542 3 545 2 0.5 8813 8764 -0.6
Cumberland Units 1-2 1290.8 1280.8 -0.8 8694 8734 0.5
Gallatin Units 1-2 237.5 239.7 0.9 9294 9252 -0.5
Gallatin Units 3-4 279.4 279.3 0.0 9200 9144 -0.6
John Sevier Units 1-3 191.4 193.1 0.9 9267 9240 -0.3
Johnsonville Units 1-4 * 119.0 118.4 -0.5 10222 10287 0.6
Johnsonville Units 5-6 118.8 118.0 -0.7 10152 10242 0.9
Johnsonville Units 7-10 150.7 149.5 -0.8 9317 9349 0.3
Kingston Units 1-4 142.3 143.0 0.5 9367 9332 -0.4
Kingston Units 5-9 191.4 193.1 0.9 9288 9261 -0.3
Miller Units 1-4 662.3 660.5 -0.3 8049 8072 0.3
Paradise Units 1-2 678.2 683.2 0.7 8790 8734 -0.6
Paradise Unit 3 1078. 1084. 0.6 8635 8581 -0.6
Scholz Plant 40.58 40.42 -0.1 9541 9581 0.4
Shawnee Units 1-10 142.3 143.0 0.5 9398 9364 -0.4
Watts Bar Units 1-4 * 57.37 57.78 0.7 11404 11333 -0.9
Widows Creek Units 1-4 * 119.8 118.6 -1.0 10096 10212 1.1
Widows Creek Units 5-6 118.0 116.9 -0.9 9442 9504 0.7
Widows Creek Unit 7 527.8 528.0 0.0 8948 8961 0.1
Widows Creek Unit 8 547.0 547.4 0.1 8692 8698 0.1
* turbine type not in G.E. set, nearest equivalent used
..
..Note: the examples are not in this file; but you can generate them
.. except for the manufacturer's drawings which can't be stored
.. on a floppy... sorry