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1. 9/27/2023 9:43:14 AM
KEPCO
KPS
SEMINAR ON
TOTAL AIR FLOW IN
BOILER
PRESENTESD BY
SUDHIR RAMTEKE

2.  WHAT IS TOTAL AIR FLOW?
TOTALAIR flow is sum of total FD fan air
flow and PA fan air flow fed to boiler.
9/27/2023 9:43:14 AM

3. AIR FLOW MESUREMENT
PRIMARY SENSING ELEMENT USED
AIRFOILIS USEDASAPRIMARY SENSING
ELEMENT TO CREATE DPACROSS THE FD AIR
FLOW & PA AIR FLOW.
 DP TYPE SMART TX.ARE USED TO MEASURE THE
FLOW.
 FLOW RANGE FOR
PAAIR FLOW TX. 0 – 100000 M3/hr
FDAIR FLOW TX. 0 – 600000 M3/hr
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4. TX. USED FOR AIR FLOW
MEASUREMENT
 PAAIR FLOW
10HLA40CF051,052 – AT MILL A
10HLA40CF053,054 – AT MILL B
10HLA40CF055,056 – AT MILL C
10HLA40CF057,058 – AT MILL D
 FD AIR FLOW
10 HLA50CF051,052,053 – AT AIR BOX ‘A’ INLET
10 HLA50CF054,055,056 – AT AIR BOX ‘B’ INLET
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5. 9/27/2023 9:43:14 AM
MEASURMENT TECHNIQUE

6. 9/27/2023 9:43:14 AM
PAAIR FLOW MEASURING
POINT

7. TOTAL PA AIR FLOW
CALCULATIONS
 TEMP. COMPENSATION & PRESSURE
COMPENSATION TECHNIQUES ARE USED
TO MEASURE THE PAAIR FLOW.
 SQUARE ROOT FUNCTIONAL BLOCK IS
USED TO CALCULATE AIR FLOW IN DCS.
 AVERAGE OF THE TWO TX. IS TAKEN TO
CALACULATE THE PA AIR FLOW AT EACH
MILL.
 SUM OF ALL FOUR MILL INLET PA AIR
FLOW IS TOTAL PA AIR FLOW.
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8. PAAIR FLOW
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9. 9/27/2023 9:43:14 AM

10. FD AIR FLOW MEASURING
POINT
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11. TOTAL FD AIR FLOW
CALCULATIONS
 TEMP. COMPENSATION & PRESSURE
COMPENSATION TECHNIQUES ARE
USED TO MEASURE THE FD AIR FLOW.
 SQUARE ROOT FUNCTIONAL BLOCK IS
USED TO CALCULATE AIR FLOW IN
DCS.
 AVERAGE OF THE THREE TX. IS
TAKEN TO CALACULATE THE FD AIR
FLOW.
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12. FD AIR FLOW
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13. 9/27/2023 9:43:14 AM

14. TOTALAIR FLOW CALCULATION
 TOTAL AIR FLOW =
TOTAL PA AIR FLOW +
[ FD AIR FLOW AT AIR BOX ‘A’ INLET
+ FD AIR FLOW AT AIR BOX ‘B’ INLET ]
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15. TOTALAIR
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16. 9/27/2023 9:43:14 AM
AIR FLOW CONTROL TECHNIQUE

17. O₂ CORRECTION & GENERATION OF
AIR DEMAND.
9/27/2023 9:43:14 AM
 UNIT LOAD DMD
 O₂ A

 O₂ B
 AIR FLOW DMD
STEAM PRESSURE


 200
F (X)
LOAD VS O₂ COMPARE
AVG O₂
PID O₂ correction
(-200 TO 400)
F (X)
LOAD VS
TOTALAIR
HI SELECT
BLOCK
ADD

18. 9/27/2023 9:43:14 AM

19. HOW TO CONTROL FD AIR FLOW?
9/27/2023 9:43:14 AM
AIR FLOW DMD
TOTAL AIR FLOW

IGV IGV



PID BALANCE 2
FD A ESMA
DEV
FD B ESMA

20. 9/27/2023 9:43:14 AM

21. HOW TO CONTROL PA AIR?
9/27/2023 9:43:14 AM
 UNIT LOAD DMD
 2.75

 PA DICHARGE PR.(PV)

 IGV A IGV B

F (X)
LOAD VS PA
PID
BALANCE 2
HI SELECT
BLOCK
ESMA ESMA

22. 9/27/2023 9:43:14 AM

23. INTERLOCKS & PROTECTIONS
 MFT INTERLOCKED WITH TOTAL AIR
FLOW
 MFT HOLDS TRUE IF TOTAL AIR FLOW
IS LESS THAN 30 %.
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24. 9/27/2023 9:43:14 AM