Transcript S.Barnes_progressreport2.ppt

Using Pinch Analysis to Optimize the Heat Exchanger Network of a
Regenerative Rankine Cycle for an Existing Modern Chemical Power
Plant
MANE 6980: Second Progress Report
October 28, 2013
Stephanie Barnes
Report Status
• Draft of report complete
– Text in all sections.
– Analysis complete pending comments.
– Need to add more to the previous work
section, proofread, fix references, captions
to figures / tables, and add final details.
Analysis
• Evaluated Ten Additional Cases
– Changed the number of heat exchangers
(combined heat exchangers and deleted heat
exchangers)
– Changed the target temperatures of some of the
hot streams
– Changed the supply temperatures of multiple
streams
• Evaluated the Effect of Delta Tmin on the
pinch point and the external utility
requirements
Results
•
•
•
Determined the pinch point and hot and
cold utility requirements for the Millstone
Unit III heat exchanger network (HEN),
using the problem table and heat
cascade (shown).
Performed a simplified analysis using 7
streams (1 cold from the condenser to
the steam generator and 6 hot streams
(1 for each feedwater heater in the
current design)).
The minimum hot and cold utility
requirements are 1,641 MBtu/hr and
370,852 MBtu/hr, respectively, as
determined by the software and 1,642
MBtu/hr and 371,225 MBtu/hr as
determined by hand calculations.
QuickTime™ and a
decompressor
are needed to see this picture.
Results - Cont.
• Determined the optimal minimum
temperature difference between the hot and
cold streams, based on external utility
requirements.
Delta
Pinch
Minimum Hot Utili ty Minimum
Cold
Tmin (F)
Temperature (F)
(MBtu/hr)
Utili ty (MBtu/hr)
10
486
0
369,210
30
476
0
369,210
40
471
0
369,210
48
467
0
369,210
50
466
1,641
370,852
70
456
19,877
389,088
Challenges
• Area and cost data for the current HEN
are not readily available.
– Did not perform area and cost analysis for
the cases that involved deleting or
combining heat exchangers.
Project Schedule
• Continue to work on the report and analysis based on
advisor’s comments.
Task
Date
Final Draft Report
November 11
Preliminary Final Report
November 25
Final Report
December 13