This plant underwent a retrofit to incorporate design changes proposed by Intek. The table shows the back pressure reductions and air in-leak test results before and after the retrofit. This demonstrated the improved efficiency of the condenser, which allowed it to handle increased air in-leakage with less effect on the overall operation. In addtion to on-going heat rate savings, the improvements could, and did, save the plant from tripping during a high air in-leak event.
|Condenser Pressure||–||1.0″Hg reduction|
|DO||30 ppb||15 ppb|
|Average Heat Rate Reduction||–||-77Btu/kWhr|
|Average Gross MW Increase||–||+6.2 MW|
|Air In-leak test summary:|
|AIL Testing||*15 + 50 SCFM||*38 + 62 SCFM|
|Condenser Pressure Increase (during tests)||+0.8″ Hg||+0.2 Hg|
|DO Increase (during tests)||+12 ppb||+2 ppb|
|CC Increase (during tests)||0.05µS/cm||<0.01µS/cm|
*The first numbers are the baseline plant air in-leakage. The second numbers are extra air in-leakage bled into the condenser during testing, with the resulting pressure and DO increases.
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